WO1997036364A1

WO1997036364A1 - Power generator and portable device

Info

Publication number: WO1997036364A1
Application number: PCT/JP1997/000885
Authority: WO
Inventors: Yasuharu Hashimoto; Osamu Takahashi; Hajime Miyazaki; Tsukasa Funasaka; Makoto Furuhata
Original assignee: Seiko Epson Corporation
Priority date: 1996-03-22
Filing date: 1997-03-19
Publication date: 1997-10-02
Also published as: CN1220782A; JP3711562B2

Abstract

A power generator suitably used for small-sized portable devices which generates electric power by vibrating a vibrating piece carrying a piezoelectric layer. The energy transmitting efficieny from an exciter to the vibrating piece is improved and the generator can efficiently generate electric power by utilizing the movement of the arm, etc., of the user. The occurrence of a secondary sollision between the vibrating piece (21) and an exciting lever (35) is prevented by making the equivalent mass of the exciting lever (35) - which causes the vibration of the vibrating piece (21) by giving a blow to the piece (21) - smaller than that of the piece (21). Since the energy loss of the vibrating piece (21) caused by the secondary collision is prevented, the energy transmitting efficieny from the exciting lever (35) to the vibration piece (21) is improved remarkably. Therefore, a power generator which has a high power generating ability and a small size and is suitable for portable devices is provided.

Description

-Description Power generation equipment and portable equipment Technical field

The present invention relates to a power generating device that generates power by vibrating a vibrating reed having a piezoelectric body, and a portable device including the power generating device. Background art

Several small devices that generate electric power using piezoelectric materials have been proposed. For example, Japanese Utility Model Laid-Open No. 6-768984 uses a rotary motion of a weight to drive a hammer lever to use piezoelectric materials. The technology to generate electricity by tapping is described. In Japanese Utility Model Laid-Open No. 63-725-93, a piezoelectric element is housed inside the watch case, and the weight is inertially operated in the vertical direction and vibrated. However, there is a description of a technology for generating electric energy by this vibration. <These power generation methods using piezoelectric materials generate power by capturing the movement of the arm and distorting the piezoelectric materials to produce a clock device. You can get the power to move. In order to obtain kinetic energy from the movement of the arm and efficiently convert it into electric energy, such a portable and small power generator firstly converts the movement of the arm and the like to the rotation of the rotating weight efficiently. Second, the kinetic energy is efficiently applied to the piezoelectric material as strain, and

Third, it is important to efficiently convert the strain applied to the piezoelectric body into electrical energy.

The kinetic energy (input energy) applied to the piezoelectric body is the strain energy of the support layer that supports the piezoelectric body and the strain energy of the piezoelectric body itself. It can be divided into three main types: electrical energy stored in power storage devices such as capacitors and electricity generated by piezoelectric power. Of these, the most important electrical energy for the power generation device varies depending on the electromechanical coupling coefficient of the piezoelectric body, the output voltage and capacitance when the piezoelectric element is not charged, the voltage of the power storage device, etc. This is only a few percent of the strain energy of the piezoelectric body. Therefore, it is being studied to generate power using a piezoelectric material that vibrates freely as a paneling lever. This is because strain can be repeatedly generated by vibrating the piezoelectric body, and the strain energy generated by the input energy can be gradually converted to electric energy. In this way, the efficiency of electric energy generated with respect to the input energy corresponding to the third requirement is improved. In the wristwatch-type power generator attached to the wrist of the user, the first factor described above is being studied so that the movement of the arm of the user is analyzed and the rotating weight rotates efficiently.

In view of the above, the present invention provides a device capable of efficiently transmitting kinetic energy, which corresponds to the second factor described above, obtained as rotational motion of a rotary weight, to a piezoelectric body as input energy. It is intended. By realizing such a device, it is an object of the present invention to provide a power generation device having a sufficient power supply capability to actually drive a portable device from the movement of a user's arm. .

In particular, as described above, the input energy can be efficiently converted to electric energy by vibrating the vibrating reed having the piezoelectric body as described above. Therefore, in the present invention, the kinetic energy of the rotary weight and the like is transmitted to the vibrating reed with as little loss as possible. The aim is to provide a possible generator. An object of the present invention is to provide a power generating device that improves power generation efficiency by efficiently applying displacement to a piezoelectric body, has a high power generation capability, and can secure a sufficient power generation amount by movement of an arm or the like. . 700885

Disclosure of the invention

When vibrating the vibrating reed by the kinetic energy of the rotary weight or the like, the inventors of the present application often lost the input energy applied to the vibrating reed to the striking portion that hits the vibrating reed and the vibrated vibrating piece. It was found to be caused by a secondary collision with the piece.

In order to prevent this secondary collision, it is necessary that after the impact unit hits the vibrating bar, the velocity in the opposite direction to the initial displacement of the vibrating bar is obtained. Therefore, at least one vibrating piece having the piezoelectric layer of the present invention, and a vibrating device that excites vibration by applying a blow to the vibrating piece, the electric power generated in the vibrating piezoelectric layer is provided. in can output power generator, and an equivalent mass m _e of the hitting portion of the vibrating unit colliding with vibration Dohen to set rather smaller than the equivalent weight M _e of the vibrating element. Thus, after the vibrating bar is hit, a velocity in the opposite direction to the initial displacement of the vibrating bar is applied to the hitting portion.

Therefore, retransmission and loss of energy due to the secondary collision between the impact portion and the vibrating piece can be prevented, so that more manpower energy can be applied to the vibrating piece and the power generation capacity can be improved.

—For example, if the vibrating bar is mounted in a cantilever shape, the mass of the vibrating bar is M _H , the distance from the fixed end to the other free end is 1 _H , and the impact from the fixed end the distance to the excitation point of striking is added by parts when an x _H, the criterion function of the vibration modes .XI _eta, the equivalent mass M _e of definitive to vibration point is represented by the following formula (a) . Also, a lever one excitation of the swirl type striking portion hurt the vibration point, the moment of inertia of I _b, the distance from the turning center to the striking point to hit the vibration point When x _b , equivalent mass m _e of the hitting portion is represented by the following formula (B).

M _e = M _H / (Ξ _η (Χ Η 1 Η)) ² m _e = I _b / x _b ^2- (B) To increase the equivalent mass of the resonator element, it is desirable to add a weight to the free end of the resonator element mounted in a cantilever shape. as the equivalent weight M _e of the case is represented by the following formula (D). Incidentally, the mass of the cantilever粱portion of the resonator element and M _H, the mass of the weight and Micromax _beta.

M _e = M _a + M „/ (Ξ _η (χ„ / 1 _Η )) ² _2CD ) In addition, when the impact coefficient between the impact part and the vibrating bar is e, the following formula C) is satisfied. This can prevent a secondary collision between the hitting portion and the resonator element. Accordingly, since there is no loss of input energy due to the secondary collision, the power generation capacity of the power generation device using the resonator element having the tortoise layer can be further improved.

M _e > ((2β + 3 ^ + 2) / 3 / 3Γβ) xm _e

(C)

In addition, when power is generated by vibrating a vibrating reed having a piezoelectric layer, the primary mode vibration, which is effectively used for power generation, is efficiently excited, and the high-order mode higher than the second-order mode is used. It is desirable to reduce vibration of the gate. Therefore, it is effective for the impact portion to apply an impact near the node of the secondary mode of the vibrating piece slightly returned from the free end of the cantilever-mounted vibrating piece to the fixed side. In addition, even when the resonator element does not have a cantilever shape, it is needless to say that it is desirable to excite the vicinity of the node of the mode in which the contribution to the power generation of the second or higher order is small.

To increase the equivalent mass by adding weight to the free end of the vibrating reed mounted in a cantilever shape, use a weight with a concave part that opens toward the free end, that is, toward the tip of the vibrating reed. By using this method, a large weight can be attached to the tip of the resonator element. In addition, by setting the vibration lever so as to collide with the inside of the concave portion, the vibration lever can be mounted on the compact. At the same time, the vibrating lever can strike the node in the secondary mode, which is slightly returned from the free end to the fixed end, so that the — Exciting the vibration of the node efficiently and improving the power generation capacity.

Such a power generation device can be realized as a portable device by being housed in a case such as an arm-mounted type, and a time-measuring device or a communication device that can operate on the portable device with the power output from the power generation device. By housing a processing device such as a device, it is possible to provide a portable device that does not require external power supply and does not require battery replacement.

Further, a rotating weight which is rotatably mounted inside the case, and a train for transmitting the movement of the rotating weight to the striking portion at a reduced speed are provided, and the striking portion is driven to swing in conjunction with the train wheel. It is desirable to use a vibration lever that collides with the vibrating bar. By increasing the speed of the oscillating weight, the oscillating lever can be driven to rotate faster than the cycle at which the oscillating weight moves.Therefore, the kinetic energy of the oscillating weight must be split by the vibrating lever and applied to the vibrating element. Becomes possible. Therefore, since the input energy given to the vibrating reed can be dispersed, the vibrating reed can be prevented from being damaged, and a vibration having a small amplitude can be repeatedly applied to the small vibrating reed. For this reason, a small and low-loss generator can be realized, and sufficient power generation can be secured.

Also, by providing a drive lever that is rotationally driven by a train of wheels, and adopting a vibration lever that is driven to rotate by contacting one end of the vibration lever with one end of the drive lever, the vibration lever is Can be downsized. As a result, the inertial moment of the vibration lever can be reduced, so that the equivalent mass of the vibration lever can be reduced, secondary collision with the vibrating element can be prevented, and the speed of the train wheel can be increased sufficiently. It is made to follow. Furthermore, it is desirable to attach such a vibration lever to the case so that the center of rotation coincides with the center of gravity. As a result, even if the angle of the case changes due to the movement of the arm etc., the vibration lever does not move unnecessarily, preventing secondary collision between the vibrating reed and the vibration lever. It is possible to provide a power generation device having a high power generation capacity capable of effectively utilizing movement and the like. In addition, by providing a plurality of vibrating bars and applying vibrations to the vibrating bars alternately with the vibrating bars, it is possible to lengthen the duration of vibration of each vibrating bar by one impact. Therefore, it is possible to prevent the loss caused by the next excitation being applied during the vibration of the resonator element, and to improve the efficiency.

Instead of the vibration lever, it is also possible to hit the vibrating bar using at least one ball that moves in a groove formed around the vibrating bar.

Furthermore, by combining the vibrating reed with a tuning fork type, or by using a shape other than a cantilever beam such as a rectangular plate, and setting the supporting position as a node of vibration, vibration loss is reduced and an efficient power generation device is configured. It is also possible. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram showing a schematic configuration of a power generator having a resonator element provided with a piezoelectric layer according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a drive system and a vibration device of the power generator shown in FIG.

FIG. 3 is an enlarged view of the vibration device shown in FIG.

Fig. 4 is a graph showing how the mechanical energy loss rate of the resonator element changes with the amplitude.

Fig. 5 is a graph showing how the transmission efficiency of energy transmitted from the vibrating lever to the vibrating bar changes depending on the ratio between the equivalent mass of the vibrating bar and the equivalent K amount of the vibrating lever.

FIG. 6 is a diagram for explaining a state in which the vibrating lever and the vibrating element collide. FIG. 6 (a) shows a state before the collision, and FIG. 6 (b) shows a state after the collision. .

Fig. 7 shows the conditions for calculating the equivalent mass of the vibrating lever and the vibrating element. FIG. '

Fig. 8 is a graph showing the displacement of the vibration lever and the vibrating bar after collision. Fig. 9 is a graph showing the re-collision limit equivalent mass of the vibration lever and the vibrating bar based on several collision coefficients. .

FIG. 10 is a graph showing a state in which the amplitude of the primary mode and the secondary mode of the vibration of the vibrating bar changes depending on the collision position where the vibrating bar is hit.

FIG. 11 is a diagram showing how the amplitudes of the primary mode and the secondary mode shown in FIG. 10 are determined from the open-circuit voltage.

FIG. 12 is a diagram showing a schematic configuration of a power generator according to Embodiment 2 of the present invention.

FIG. 13 is a diagram showing a schematic configuration of a power generator according to Embodiment 3 of the present invention.

FIG. 14 is a diagram showing a schematic configuration of a power generator according to Embodiment 4 of the present invention.

FIG. 15 is a diagram showing a schematic configuration of a power generator according to Embodiment 5 of the present invention.

FIG. 16 is a view showing a cross section of a groove portion of the power generating apparatus shown in FIG.

FIG. 17 is a diagram showing a schematic configuration of a power generator according to Embodiment 6 of the present invention.

FIG. 18 is a view showing a shape and a vibration mode of a resonator element of the power generating apparatus shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

(Example 1)

Hereinafter, the present invention will be described in more detail with reference to the drawings. First FIG. 1 shows an outline of a wrist-mounted portable device provided with a power generator according to an embodiment of the present invention. The portable device 10 of this example is composed of a power generating device 20 including a vibrating reed 21 having piezoelectric layers 22 a and 22 b and an alternating current obtained by vibrating the vibrating reed 21. It includes a rectifying circuit 2 for rectifying, a power storage circuit 4 for storing the rectified current, and a processing device 6 for performing timekeeping processing with the generated current. The processing device 6 may have a function such as a radio, a louver, or a personal computer in addition to the timekeeping process such as driving the clock unit 7 or performing an alarm process. Further, in this example, the capacitor 5 is used for the power storage circuit 4, but any device having a power storage capability such as a secondary battery may be used. The rectifier circuit 2 is not limited to the full-wave rectifier using the diode 3 as in the present embodiment, but may be a half-wave rectifier circuit or a rectifier circuit using an inverter or the like. good. Although the portable device of this example is shown in a conceptual diagram in FIG. 1, the rectifier circuit 2, the power storage circuit 4, the processing device 6, and the like are arranged so as to overlap a drive system 11 described later in a plan view. They are arranged to reduce the size of the entire device.

The power generating device 20 of this example includes a vibrating device 30 that applies vibration to the vibrating piece 21 having a piezoelectric layer, and the vibrating device 30 is driven by a driving system 40. It has become. The vibrating reed 21 is fixed to the base plate 12 in a cantilever shape, and includes a metal support layer 26 and piezoelectric layers 22 a and 22 b formed on both sides thereof. ing. In addition, a weight 25 is attached to the tip (free end) 23 of the vibrating reed 21 for free vibration. The weight 25 is provided with a recess 25 c at the center, which is open toward the free end 23. The active end 39 of the vibrating lever 35 collides with the inside of the recess 25c, and is set so that the vibrating piece 21 is hit. Therefore, when the vibration lever 35 of the vibration device 30 turns, the vibrating piece 21 is vibrated, and the tip 2 3 of the vibrating piece 2 1 is j Li] end, and the side 24 fixed to the main plate 1'2 with the screw 27 becomes the fixed end and freely vibrates. Accordingly, the piezoelectric layers 22 a and 22 b of the resonator element 21 are repeatedly displaced accordingly, and an electromotive force is generated.

The drive system 40 of the present example is provided with a rotary weight 13 that performs a rotary motion inside the case 1, and when mounted as a wrist watch, the rotary weight 13 is attached to the arm or body of the user. It rotates in response to the movement of the robot and uses the force to apply vibration to the resonator element 21. Also, the drive system of this example

40 is provided with a train wheel 41 having the configuration shown in FIG. 2 so as to increase the speed of the movement of the rotary weight 13 and to be applied to the vibration device 30. The movement of the oscillating weight 13 is transmitted to the first intermediate wheel 15a by the oscillating weight wheel 14 constituting the train wheel 4 1 and is accelerated. The first intermediate wheel 15a is meshed with a second intermediate wheel 15b of the same diameter, and the first and second intermediate wheels 15a and 15a 1 5b rotates. Then, the respective movements of the intermediate cars 15a and 15b are transmitted to the driving levers of the vibrator 30 and the cars 31a and 31b, and these intermediate cars 15a and 1

Since 5b rotates in the opposite direction with the same diameter, the drive lever wheels 31a and 31b are rotationally driven at the same speed in the opposite direction. By using such a train wheel 41, for example, when the rotating weight 13 moves at about 1 Hz after capturing the movement of the user's wrist, the movement is accelerated to about 50 Hz and accelerated. Can be transmitted to the vibration device 30. In the vibrating device of this example, the vibrating lever 35 is driven by the two drive levers 32a and 32b, so that the vibrating bar 21 receives an impact in units of about 100 Hz. Is applied, whereby a vibration of about 2 kHz is excited in the resonator element 21. The above-mentioned frequencies are examples, and it is a matter of course that the present invention is not limited to these frequencies. Intermediate wheels 15a and 15b that make up such a train wheel 4 1 The gears and levers described above are combined so that they can be arranged in a narrow space between the ground plate 12 in the case 1 and the rotary weight receiver 16 supporting the rotary weight 13.

When the drive lever wheels 31a and 31b are rotationally driven by the drive train 40, the drive lever wheels 31a and 31b move in the same manner as the drive lever wheels 31a and 31b. It rotates at a speed equal to the direction, whereby the two passive ends 36 a and 36 b of the excitation lever 35 are moved respectively. The drive lever 35 is turned left and right around the center 37 of the drive lever by the drive levers 32a and 32b, and in response to this movement, the passive end of the drive lever 35 is actuated. Active end 39 located on the opposite side of 36 moves left and right. The active end 39 applies an impact to the inside of the weight 25 at the tip of the vibrating reed 21 to excite the vibrating reed 21. FIG. 2 shows a combination of one intermediate table 15a, one driving lever 31a, a driving lever 32a, and a passive end 36a. The same applies to the combination of car 15b, drive lever car 31b, drive lever -32b, and passive end 36b.

The vibrating reed has a large kinetic energy like the rotating weight 13 with respect to the vibrating reed 21 of the power generating device 20. If the vibrating reed is directly vibrated, it is necessary to increase the size of the vibrating reed to prevent breakage. On the other hand, when the speed of the rotating weight 13 is increased by using the train wheel 4 1 as in this example, the kinetic energy of the rotating weight 13 can be divided and applied to the vibrating piece 21. It is possible to prevent damage and reduce the size of the resonator element 21.

Furthermore, as shown in Fig. 4, the loss rate of mechanical energy when the resonator element vibrates becomes larger as the amplitude increases for the same vibrator. By applying the voltage, the amplitude can be suppressed to a small value, and the mechanical energy loss in the resonator element 21 can be reduced. FIG. 3 shows an enlarged view of the arrangement of the driving levers 32a and 32b constituting the vibrating device 3 and the vibrating lever 35. The drive levers 32a and 32b in this example are almost spindle-shaped levers, and each lever 32a and 32b is equal with its center 33a and 33b as the rotation center. It is driven to rotate in the reverse direction at the speed. Furthermore, these spindle-shaped levers 32a and 32b are set to rotate out of phase, and both ends 34 of the levers are connected to the passive ends 36a of the vibration lever. And 36 b alternately to drive the passive lever 35.

The passive ends 36a and 36b are located at appropriate angles away in consideration of the arrangement of the intermediate wheels 15a and 15b. The drive end 39 is located on the opposite side to the center 37 of the vibration lever. Further, in the vibration device 30 of the present example, the center 3 3a of the drive lever 3 2a is selected so that the kinetic energy of the drive levers 32a and 32b can be transmitted to the passive lever 35 most efficiently. The position 38 a where both ends 34 contact the passive end 36 a of the vibrating lever and the center 37 of the vibrating lever 35 are arranged substantially in a straight line. The center 3 3b of the drive lever 3 2b, the position 3 8b where its both ends 3 4 abut the passive end 36 b of the receiving lever, and the center 3 7 of the vibrating lever 3 5 are almost straight It is arranged so that it becomes.

The vibrating lever 35 of the vibrating device of this example can be transmitted from the driving system 40 to the vibrating lever 35 with very little energy loss by arranging as described above. Since the drive levers 32a and 32b are alternately driven, vibration can be efficiently excited by giving input energy to the resonator element 21 in smaller time units. In addition, since the drive levers 35 are driven by the drive levers 32a and 32b, the moment of inertia of the drive lever 35 can be reduced. Even when the vibration lever 35 moves at a relatively high frequency, it is possible to cause the motion to sufficiently follow the high-frequency motion that has been accelerated. Furthermore, as described later, since the equivalent mass of the vibration lever can be reduced by reducing the moment of inertia of the vibration lever, the effect of reducing energy loss due to secondary collision with the vibrating piece is also provided. In addition, the vibrating lever 35 in this example is attached to the case 1 with its center of gravity substantially at the center of rotation 37, so that the vibrating lever 35 can be used only by changing the direction of the case 1. It does not turn. For this reason, the vibration lever 35 is driven only by the drive levers 32a and 32b, so that the positional relationship with the drive lever is always properly maintained. Also, the vibration lever 35 is prevented from moving inadvertently depending on the direction of the case 1 to cause a secondary collision with the vibrating bar 21, thereby preventing energy loss.

FIG. 5 shows the input energy (vibration energy of the vibrating bar 21) E i and the kinetic energy E of the vibrating lever 35 in the power generator 20 of this example. Ratio (energy transmission _{efficiency) 77 t (= E i /} E.) is the ratio of the equivalent mass M _e of the resonator element 2 1 equivalent weight m _e of the vibrating lever 35 (equivalent mass ratio) M _R ( = is shown how the changed by m _e / M j as can be seen from. this drawing, if the equivalent weight ratio M _R is less than 1, the energy transfer efficiency r? _t in accordance with equivalent mass ratio M _R is increased increases. in contrast, energy transduction efficiency 77 _t becomes the equivalent mass ratio M _R is approximately 1 rapidly decreases, equivalent mass ratio M _R is greater than 1 when the energy first transmission efficiency 7? _t increases again but the initial speed of the vibration of the resonator element 2 1 according equivalent mass ratio M _R is the maximum value by remote lowered in less than 1. equivalent mass ratio M _R If there is less than 1, the equivalent mass ratio M _R is increased There the energy transfer efficiency ?? _t is increased with the increase. in contrast, it approaches the equivalent mass ratio M _R is approximately 1, pressurized shake -3 5 of the kinetic energy E. Gahopo Since the vibration is transmitted to the vibrating bar 21, the vibrating lever 35 stops at the position where the vibrating bar 21 is hit, and a secondary collision between the vibrating bar 21 and the vibrating lever 35 occurs. Due to this secondary collision, the input energy obtained by the resonator element 21 is applied to the vibrating lever 35 in the opposite direction, resulting in an energy loss, so that the energy transfer efficiency r? _T decreases rapidly. When the equivalent mass ratio M _R exceeds 1, the energy loss due to the secondary collision on the side of the resonator element 2 1 slightly decreases, also including tertiary collision occurs, the energy transfer power factor? ? _t rises.

Thus, when the equivalent mass ratio M _R is 1, the energy transfer efficiency 77 _t becomes very low. To improve the energy transfer efficiency 7 _t , set the equivalent mass ratio! ^^ to less than 1 so that secondary collision does not occur, or the energy transfer efficiency 7? _T even if secondary collision occurs. It is necessary to find a condition that does not decrease much. Thus, the inventors of the present application have found conditions for preventing a secondary collision between the vibration lever 35 and the vibrating piece 21 as described below. The in FIG. 6, a system for collision excitation lever 35 to the vibration plate 2 1 it its equivalent mass M _e and m _e, further, are shown using the equivalent panel constant K of the resonator element 2 1. Equivalent mass M _e, as shown below Ri by the be evaluated using the m _e and equivalent panel constant K, the striking part and the resonator element is not limited to the combination of the cantilever with vibrating lever, described later The present invention can be equally applied to a case where a different mechanism such as a ball is used for the striking portion or a case where a piezoelectric body having a different shape such as a rectangular plate is used for the vibrating piece.

Equivalent mass M _e of the resonator element 2 1, FIG. 7 (a) to indicate the kind of mass M _H, hit by the distance 1 _H, fixed end or et striking portion from the fixed fixed end to the other free end Is expressed as follows for the distance x _H to the excitation point X to which is added and the vibrating bar of the reference function 関数_η of the vibration mode.

M _e = Μ _Η / (Ξ _η (Χ Η / 1 Η))) 2 However, _assuming that the reference function _{n } and the density at the integration point are p, the function satisfies the following relationship.

. SSS _i o H _tl ² - desirably vibration of the primary mode is excited in _{d V = M H · · ·} (2) vibrating piece 2 1 of the present embodiment, criterion function of this mode is less become that way.

J = (cos α] y— cos h, y)

-(Cos hi iy + cos haiy) / (sin a, y + sin ha:, y) x (sin aiy-sin ha! Y) (3) where y = x H / 1 _H

cos a J x cos ha J =-1 (where hi is the first solution). Further, the equivalent mass m _e of the vibrating lever 35 is inertia Mome down bets I _b, the excitation lever 35 of the distance X _h from the turning center to the striking point giving Da孥the vibration point of the vibrating element On the other hand, it is expressed as follows.

m _e = I _b / x _b ² ··· (4) In addition, as shown in Fig. 7 (b), when a vibrating piece 21 If is other than a cantilever, the standard functions Ξ and () are different, but can be obtained in the same way as above. In addition, the excitation point is very close to the tip, and the distance 1 H from the fixed end to the free end is almost equal to the distance x _H from the fixed end to the excitation point X where the impact is applied by the impact part. If, approximated by the equation below the equivalent mass of the vibrating element such as the FIG. 7 by using a mass M _a of equivalent mass M _e and the weight in the obtained beam-like vibrating reed formula (1) (b) it can.

In _{_{_{M e = M a + M H}}} / (Ξ η (χ Η / 1 Η)) 2 · · · (1 ') back to FIG. 6, the equivalent mass m vibration lever _e 3 5 speed V _b after colliding with the vibrating element 2 the first equivalent mass M _e, in order resonator element 2 1 that initiated the vibration does not cause the secondary collision, the vibrating lever 35 after crash displacement in the opposite direction of the resonator element 2 1 It is necessary to obtain speed. Therefore, the excitation T P97 / 00885

Fifteen

Lever one 3 during 5 of equivalent mass M _e Noto the equivalent mass m _e of the resonator element 2 1 the following relationship is required to hold true.

m _c <Μ. · · · (5) Further analysis shows that the following equation is derived from the law of conservation of momentum when the collision coefficient between the excitation lever and the resonator element is e.

O x M _e + V _b x m _e = V _H 'XM _e + V _b ' x m _e · · · (6) (V _b , V _H ) / V _b = _ e · · (7) V _H ′ and V _t are the respective velocities of the vibrating bar 21 and the excitation lever 35 immediately after the collision.

Next, the motion of the vibrating piece 21 and the motion of the vibrating lever 35 after the collision are examined, as shown in FIG. First, the vibrating reed 21 starts to vibrate from the time of being hit, and shows a displacement as shown by a solid line 51 in FIG. The displacement u _H is represented by the following equation. For simplicity, primary mode vibration is considered for the vibrating piece 21 and no vibration attenuation is considered.

u H two A · sin ω t · (8)

Here, ω indicates angular velocity, Α indicates amplitude, and t indicates time. From the initial conditions, the following relationship is satisfied.

(du _H / dt) t = 0 = ω · A = V _H , · · · (9) On the other hand, the excitation lever 35 is far from the impact point at the velocity V _b , as indicated by the dashed line 52. Therefore, the displacement li b is expressed by the following equation.

_{b = V b '· t ·} · · (1 0) Ri by more than, for vibrating piece 2 1 and vibrating lever 35 does not cause a secondary collision, the displacement UH and U _h the time t is 0 It is good if you do not have a solution at any time. In other words, it is sufficient if the following equation (11) does not have a solution except for t = 0. A · sin ω t = V " _b '-t · ■ (1 1) Approximating equation (8) with a cubic equation to solve equation (1 1) The displacement u„ of the resonator element 2 1 is Since it passes through each point of 0, Q and S in Fig. 8, it can be approximated by the following cubic equation.

u „ ₃ (t) = B 't (t-π / ω) (t-2 ττ / ω)

(1 2)

Here, since the equation (12) passes through the point R (3κ / 2ω, 100) in FIG. 8, the constant B is as follows from the equation (9).

Β = 8 · ω ² / (3 · ττ ³ ) XV „'· · · (13) Therefore, equation (11) can be approximated by the following equation (14).

Β · t ((t-π / ω) (t-2-π / ω) — V _b , / Β)) = 0 · · (1 4) Therefore, the discriminant of the following equation (1 5) D is determined, and based on the fact that ω, e and m _e are all greater than 0, a condition for the discriminant D <0 is determined, and the relations of the equations (13) and (6) and (7) are used. organize.

(t ττ / ω) (t — 2 · ττ / ω) — V _b , / B = 0

(15)

This ensures that the relationship shown in Equation (1 6) between the equivalent mass m _e of the equivalent mass M _e and vibrating lever resonator element can be obtained.

M _e > ((2-e + 3 · ΤΓ + 2) / 3 · π · e) xm _e

(16)

As described above, by employing the vibrating bar and the vibrating lever having an equivalent mass satisfying the above equation (16), power generation without energy loss due to secondary collision between the vibrating bar and the vibrating lever is achieved. Equipment can be provided.

Based on the above considerations, the conditions under which the vibrating reed and the vibrating lever did not collide with each other could be replaced with the equivalent mass conditions. In FIG. 9, based on the equation & (1 '6) above, the following equivalent mass of recollision limit equivalent Weight of satisfying the relationship resonator element M _e and vibrating lever equivalent mass m _e different collision factor e Is shown for

M _e = ((2 Θ 3 + 3 Γ 7 Γ + 2) / 3 ΤΓ Θ) X m _e , (1 7)

As shown in FIG. 5, since the equivalent mass ratio M _R is high energy transfer efficiency 77 _t closer to 1 in the range of the secondary collision does not occur, the equivalent of equivalent mass M _e and vibrating lever of the vibrating element mass m _e is arbitrarily desirable to employ a close relationship of the re-collision limit equivalent mass.

Further, the inventors of the present application have found that the electromotive voltage generated from the vibrating bar 21 fluctuates even with the change of the excitation point X shown in FIG. When given, the vibration that contributes to power generation is the vibration in the primary mode, and when a higher-order vibration that is higher than the secondary mode occurs, the vibration mode is excited to the primary mode that is effective for power generation. Input energy is reduced. To measure this change, the inventors measured how the amplitude of the primary mode and the amplitude of the secondary mode change depending on the excitation point X, and the results are shown in FIG. 10. . For the measurement, a piezoelectric a is PZT layer evening Yunimo Ruff full-length 1 _H laminated on phosphorous bronze support material is 2 1 mm using a vibrating reed Eve, vibrating piece excitation point X shown in FIG. 7 The open-circuit voltage V generated by the vibrating reed after the impact is changed while changing the distance (collision position (1 „1 x _H )) from the tip (free end) of the wire is measured. A value almost proportional to the amplitude of the piece is obtained, and a waveform in which the primary mode of vibration overlaps the secondary mode is obtained, as shown in Fig. 11. Therefore, 1 The amplitudes V and V of the second and second modes were obtained, and the results are shown in Figure 10.

As can be seen from Fig. 10, the person who hit the vibrating piece slightly back from the free end toward the fixed end, compared with the case where the free end of the vibrating piece was hit It can be seen that the amplitude of the first mode can be increased and the amplitude of the second mode can be reduced. Then, the amplitude of the primary mode becomes maximum when the collision position is about 3.5 mm from the tip, and the amplitude of the secondary mode becomes minimum at almost the same collision position. It is considered that there is a node of the vibration of the secondary mode near the position where the amplitude of the secondary mode becomes minimum. Therefore, it can be seen that by hitting the vibrating piece near the node of the secondary mode vibration, the occurrence of the secondary mode can be suppressed and the amplitude of the primary mode contributing to power generation can be increased. . Therefore, instead of hitting the free end of the vibrating reed, rather than hitting it at a position slightly returned from the free end, the input energy is applied to the vibrating reed so that it can be effectively used by power generation. It can be seen that a power generation device using a piezoelectric material having high power generation capability can be provided.

As described above, according to the inventors of the present invention, in order to effectively transmit energy to the vibrating reed in the power generating device using the vibrating reed having the piezoelectric layer, the vibration collides with the equivalent mass of the vibrating reed. It has been found that it is desirable to set the relationship with the equivalent mass of the striking part such as the vibration lever in a range where secondary collision does not occur. Furthermore, in order to suppress the occurrence of secondary mode torsion in the resonator element and to more effectively use the input energy for power generation, the vibration of the secondary mode, in which the secondary mode vibration is hardly excited, is required. It was also found that it was desirable to make a blow near the _ section.

In the power generating device 20 of the present example shown in FIG. 1, a concave weight 25 is added to the free end 23 of the vibrating reed 21, so that even the small vibrating reed 21 can be used. The configuration is such that the equivalent mass can be adjusted to make it larger than the vibration lever 35. Also, in the vibration lever 35, a cam portion or the like is provided so as to be driven not through the wheel train 41 directly but through the drive lever 32. 3 5 small PT / JP97 / 00885

19

It is designed so that the equivalent mass can be reduced by molding. Therefore, the power generation device 20 of the present example has a configuration in which secondary collision between the vibrating reed 21 and the vibration lever 35 can be prevented, and energy loss due to the secondary collision can be eliminated. It is a high power generator. In addition, since a concave weight 25 is used, the weight can be extended on both sides of the free end of the resonator element, so that a sufficient weight can be arranged in a small space.

Further, in the power generator 20 of this example, the active end 39 of the vibrating lever 35 is provided inside the recess 25c of the concave weight 25. Accordingly, the active end 39 excites the position of the entire vibrating piece 21 including the weight 25 from the free end 23 to a position slightly returned to the fixed end 24. For this reason, the input energy is transmitted to the resonator element 21 such that the amplitude of the secondary mode is small and the amplitude of the primary mode is larger, and a power generation device with high power generation capability is obtained.

Further, as described above, the power generating device 20 of the present example accelerates the movement of the oscillating weight 13 by the train wheel 41 and strikes the vibrating piece 21 to split the kinetic energy of the oscillating weight 13. The kinetic energy of the rotating weight 13 can be transmitted very efficiently to a small vibrating piece 21 equipped with a piezoelectric layer, for example, it can be applied to the vibrating piece 21 with a piezoelectric layer. is there.

The power supplied by the power generation device of this example can operate not only the time measurement device of this example but also processing devices such as a pager, a telephone, a radio, a hearing aid, a calculator, and an information terminal. is there. Also, the shape of the portable device is not limited to a portable device that is mounted on an arm, such as a vehicle-mounted type or a pocket type. By employing the power generation device of the present invention in these portable devices, the function of the processing device mounted on the portable device can be exhibited anytime and anywhere without worrying about running out of batteries. 0 5

20

it can. ―

(Example 2)

FIG. 12 shows a wrist-worn S-type portable device 60 including a power generation device 20 according to the present invention. The power generation device 20 of this example also includes a vibrating piece 21 having a piezoelectric layer, and the kinetic energy of the rotating weight 13 rotating in the case 1 of the portable device 60 with respect to the vibrating piece 21 is provided. A blow is applied to excite the vibration, and the generated current can be supplied. Therefore, portions common to those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. The same applies to the other embodiments described below.

In the power generation device 20 of this example, the excitation lever 35 is turned by one drive lever 32 to supply kinetic energy to the vibrating piece 21. Therefore, the wheel train 41 of the drive system 40 is also configured to increase the movement of the rotary weight 13 by one intermediate wheel 15 and transmit it to the drive lever 13 2. Therefore, the configurations of the wheel train 41 and the drive levers 32 of the drive system 40 can be simplified, so that the power generation device 20 and the portable device 60 can be reduced in size at any time. Further, a concave weight 25 is provided at the free end 23 of the vibrating reed 21, and the active end 39 of the vibrating lever 35 is installed inside the M part 25 c. As in the first embodiment, a secondary collision between the vibrating lever 35 and the vibrating piece 21 can be prevented, so that the first mode vibration is easily excited. Further, since the movement of the rotary weight 13 is transmitted at an increased speed by the train wheel 41, the kinetic energy of the rotary weight 13 is divided and supplied to the resonator element. As described above, the power generation device and the arm-mounted device of the present example have improved energy transfer efficiency as in the first embodiment, and are smaller and have higher power generation capability and the arm-mounted device. It is.

(Example 3) FIG. 13 shows an example of a different power generation device 20 according to the embodiment of the present invention '. The power generating device 20 of this example includes two vibrating bars 21a and 21b, and the active end 39 of the vibrating lever 35 is connected to the two vibrating bars 21a and 21b. It is located between. Then, the fixed ends 2 4 are slightly more than the free ends 23 of the weights 25 a and 25 b installed at the free ends 23 a and 23 b of the two vibrating bars 21 a and 21 b. The returning place is alternately impacted by the vibrating levers 35, which are exciting the vibrating pieces 21a and 21b. In the power generator 20 of this example, since the two vibrating reeds 21a and 21b are hit alternately, the time for which the vibrating is continued by one hit is longer for each vibrating reed. Can be taken. Therefore, the period during which the input energy by one impact is converted into electric energy can be set longer, so that the energy transmitted by the vibrating lever increases, and even if the number of vibrations of the vibrating piece 21 increases. A sufficient margin time can be secured before the next vibration. For this reason, the situation where the next vibration is further excited during the vibration can be prevented, and the loss of vibration energy due to such a situation can be avoided.

In this example, two vibrating bars 2 1 a and 2 1 b are alternately hit by a vibrating lever. For example, three or more vibrating pieces are provided around a rotating vibrating lever. By arranging vibrating reeds or using multiple vibrating levers, it is possible to alternately hit three or more n vibrating reeds.

(Example 4)

FIG. 14 shows an example of a different power generator according to the embodiment of the present invention. In the power generation device 20 of this example, the support layers 26 a and 26 b of the two vibrating bars 21 a and 21 b are formed in a tuning fork shape, and these two support layers 26 a and 2 b 6 b Connect base 2 6 c to main plate 12 Is attached. In addition, each of the vibrating pieces 2 1 is connected to two different rectifier circuits (not shown) of the piezoelectric layers 2 2 a and 22 b provided on the respective screw pieces 2 la and 2 lb. Current is supplied from a and 21b. Therefore, power can be extracted from both the mode in which the left and right arms swing when the tuning fork is externally excited and the mode in which the left and right arms swing in opposite phases. The vibration loss of the in-phase mode is considered to be almost the same as that of the shoulder beam, but the vibration loss of the out-of-phase mode is very small because no force is applied to the fixed part. For this reason, the input energy applied to the opposite-phase mode can be efficiently converted to electric power, and therefore, it is possible to provide a power generation shield using a piezoelectric material that is more efficient than a cantilever.

Also, the vibration lever 35 has a smaller equivalent mass than the vibrating bars 21 a and 21 b as in the embodiment described above, and furthermore, the vibration levers 21 a and 21 b The part slightly returned from the free end to the fixed end is hit. Therefore, by generating power using the vibrator 29 combined with the tuning fork type of this example, it is possible to generate a vibration having a small vibration loss rate by utilizing the characteristics of the tuning fork. It is possible to provide a power generation device with high power generation efficiency by suppressing mechanical energy loss.

(Example 5)

FIGS. 15 and 16 show schematic configurations of different power generators 20 according to the embodiment of the present invention. In the power generator 20 of the present example, a pole 62 is used for a striking portion that vibrates the resonator element 21. In the power generation device 20 of this example, the free end 23 of the vibrating piece 21 was slightly returned to the fixed end 24 in the upper and lower cases 65 a and 65 b containing the vibrating piece 21. A circular groove 61 passing through the position is formed, and the ball 62 can move freely inside the groove 61. Therefore, case 6 5 When the ball έ 2 is moved by moving the vibrating bar 2, the ball 6 2 collides with the vibrating bar 2 1 at a position slightly returned from the free end 23 of the vibrating bar 2 1, and vibrates the vibrating bar 2 1. I have. As a result, an electromotive force is generated in the piezoelectric layers 22a and 22b of the resonator element 21 and power is generated.

In the power generating device 20 of this example, the equivalent mass of the ball 62 that hits the vibrating bar 21 can be made smaller than the equivalent mass of the vibrating bar 21. Thus, the energy transfer efficiency from the ball 62 to the resonator element 21 can be increased. Also, since the ball 62 that hits the vibrating piece 21 can move freely inside the groove 61, there is no need for a complicated structure such as a bearing for attaching a rotating weight or a train wheel. Become. Therefore, it is possible to provide a low-cost power generator with a simple configuration and high power generation capacity. Further, by enclosing a plurality of balls 62 in the groove 61, it is possible to increase the number of hits to the vibrating reed 21, and the energy for moving the case 65 can be more efficiently used. Can be transmitted to (Example 6)

FIG. 17 and FIG. 18 show schematic configurations of different power generating devices 20 according to the embodiment of the present invention. In the power generator 20 of the present example, the ball 62 is used for the striking portion that vibrates the vibrating piece 21. In the power generating device 20 of this example, a circular groove 61 is formed inside a case 65 accommodating a rectangular plate-shaped vibrating piece 21 having both ends free, and a ball 61 is formed inside the groove 61. 6 2 can move freely. Therefore, when the ball 62 is moved by giving a motion to the case 65, the ball 62 collides with the vibrating bar 21 to vibrate the vibrating bar 21. As a result, electromotive force is generated in the piezoelectric layers 22 a and 22 b of the resonator element 21, and power is generated.

In this embodiment, the shape of the resonator element 21 is shown in Fig. 18 (a). As shown, it is a “rectangular” plate with both ends free, so the primary mode has nodes 8 1 a and 8 1 b. By supporting the nodes 81a and 81b with the support members 71a and 71b shown in FIG. 18 (b), it is possible to prevent vibration loss due to fixing of the resonator element.

In addition, as in the case of the cantilever, by hitting the vibrating reed in the vicinity of the node of the higher mode vibration, the generation of the higher mode is suppressed, and the primary mode that contributes to power generation is suppressed. The amplitude can be increased. Fig. 18 (c) shows the primary mode, Fig. 18 (d) shows the secondary mode, and Fig. 18 (e) shows the tertiary mode of a rectangular plate with S ends. The straight line in the figure represents the position in the longitudinal direction of the rectangular plate, and the curve represents the shape during deformation. The numerical values in the figure indicate the positions of the nodes of vibration when the length in the longitudinal direction of the rectangular plate is set to 1. From these, it is not 10% to 13% of the total length from the free end where the nodes of the 2nd and 3rd modes are located, or from the free end, instead of the ends that are the antinodes of vibration in all modes. It is desirable to hit the area between 36% and 50% of the total length.

In the power generating device 20 of this example, the equivalent mass of the ball 62 that hits the vibrating bar 21 can be made smaller than the equivalent mass of the vibrating bar 21. Thus, the energy transfer efficiency from the ball 62 to the resonator element 21 can be increased. In addition, since the ball 62 that hits the vibrating bar 21 can move freely inside the groove 61, a complicated structure such as a bearing for attaching a rotating weight or a train wheel is not required. Becomes Therefore, it is possible to provide a low-cost power generator with a simple configuration and high power generation capacity. Further, by enclosing a plurality of balls 62 in the groove 61, it is possible to increase the number of hits to the vibrating reed 21. The energy for moving the case 65 is more efficiently used. Can be transmitted to Therefore, by using the vibrator 21 of this example to generate power, Since a vibration with a small vibration loss rate that makes use of the characteristics of a free rectangular plate can be generated, a power generation device with high power generation efficiency can be provided by suppressing mechanical energy loss.

Up to this point, in Examples 1 to 5, the inventors of the present application have established the mass relationship between the cantilever-shaped vibrating reed and the vibrating portion (lever, ball, etc.) without loss due to the secondary collision. In Example 6, it was stated that the same loss-free setting is possible for the rectangular plate-shaped moving piece and the vibrating section that are free at both ends. However, the present invention is not limited to these vibrating reeds / vibration structures, and any vibrating reed, such as a disk, trapezoidal plate, rectangular plate, cylinder, or rectangular parallelepiped, and any vibrating reed, ball, leaf spring, etc. As shown in Fig. 8, when the vibrating bar hits the vibrating bar, the setting of the vibrating bar is also applied to the vibrating bar in the opposite direction. The same effect of eliminating the effect can be obtained. In addition, this setting can be easily obtained by observing the vibrating section by colliding with the same vibrating piece while gradually reducing the mass of the prescribed section. That is, it is obvious that all the power generating devices in which the vibrating piece is given a speed in the opposite direction after the vibrating piece hits the vibrating piece are within the scope of the present invention.

In the above embodiment, the vibrating piece of the bimorph filter in which the two piezoelectric layers 22 a and 22 b are formed on both sides of the metal support layer 26, or the piezoelectric layer 22 a The description is based on a device that generates power using a resonator element in which 2 and 2b are stacked. Of course, it may be used. In addition, the materials that make up the piezoelectric body are PZT (trademark), ceramic materials such as barium titanate and lead titanate, single crystals such as quartz and lithium niobate, and polymer materials such as PVDF. Of course, it is good.

Further, the present invention provides an arm-mounted type such as the timepiece described in the above embodiment. Not limited to portable devices ^). Since the present invention can provide a small-sized power generation device having a high power generation capability, it is suitable as a power generation device incorporated in other small and portable electronic devices. For example, a pager, a telephone, a wireless device, a hearing aid, The power generation device of the present invention can be applied to information terminals such as meters, calculators, electronic organizers, IC cards, radio receivers, and the like. By adopting the power generation device of the present invention in these portable devices, power generation can be efficiently performed by capturing human movements, etc., and battery consumption can be suppressed, or the battery itself can be made unnecessary. It is also possible to do so. Therefore, users can use these portable devices without worrying about running out of battery, and problems such as loss of data stored in memory due to running out of battery can be prevented. Furthermore, the function of the portable electronic device can be exhibited even in an area or place where a battery or a charging device is not readily available, or in a situation where it is difficult to replenish the battery due to a disaster or the like. Industrial applicability

As described above, the present invention relates to a power generating apparatus that generates power by vibrating a vibrating reed having a piezoelectric layer, wherein the equivalent mass of a striking portion that excites the vibrating reed by hitting the vibrating reed is set to By making the mass smaller than the equivalent mass, the secondary collision between the vibrating piece and the impact portion is prevented. For this reason, according to the present invention, energy loss due to a secondary collision can be prevented, and a power generation device with extremely high energy transmission efficiency from the impact portion to the resonator element can be provided. Therefore, the power generating device according to the present invention can efficiently apply the kinetic energy generated by the rotating weight or the like to the vibrating reed as input energy, and thus the power generating device using the vibrating reed having the piezoelectric layer with high power generation efficiency In this case, large input energy can be supplied to the resonator element, and a power generation device with high power generation capability can be realized. Therefore, it is possible to provide a power generator suitable for supplying electric power to a small and portable portable device using the piezoelectric body.

Furthermore, in the present invention, the amplitude of the primary mode contributing to power generation is increased by setting the position where the vibrating piece is excited near the node of the secondary mode, and the input energy is effectively used for power generation. It is being used. Further, in the present invention, the rotational movement of the rotating fe / weight mounted on the arm-mounted device is accelerated using a wheel train, and kinetic energy is divided and applied to the vibrating reed to thereby provide a mechanical device during vibration. By reducing the power loss and improving the conversion efficiency, a small-sized power generation device with high power generation capacity using a piezoelectric material has been realized. In addition, by providing a plurality of vibrating bars and applying vibrations to the vibrating levers alternately with the vibrating bars, it is possible to increase the duration of the vibration of each vibrating bar by one impact. Therefore, it is possible to prevent the loss caused by the next excitation being applied during the vibration of the resonator element, and to improve the efficiency. In addition, the vibrating reed is made of a tuning fork or a rectangular plate with both ends free, and is supported on a node in the primary mode to reduce fixed loss, improve conversion efficiency, and use a piezoelectric material with high power generation capability. A power generation device has been realized.

As described above, the power generation device of the present invention can efficiently transmit the kinetic energy obtained by capturing the movement of the user's arm, etc., to the resonator element, so that sufficient power is supplied to the small-sized portable device. It is possible to provide a power generator that can be used.

Claims

' The scope of the claims

1. At least one vibrating reed with a piezoelectric layer and a vibrating device that excites vibration by hitting the vibrating reed, and can output power generated by the vibrating piezoelectric layer In the ¾ 'device,

It said vibrator has a striking part impinging on the resonator element, the power generation and wherein the equivalent mass m _e of the striking part is less than the equivalent mass M _e of the resonator element.

2. At least one vibrating reed with a piezoelectric layer and a vibrating device that excites vibration by applying a shock to the vibrating reed can output power generated by the vibrating piezoelectric layer. Power generation equipment,

The vibrating device includes a striking portion that collides with the vibrating reed, and immediately after the striking portion strikes the vibrating reed, the striking portion is given a velocity in an opposite direction to the vibrating reed. A power generator characterized by the above-mentioned.

3. The vibrating reed according to claim 1, wherein the vibrating reed is mounted in a cantilever shape, the mass thereof is M _H , the distance from the fixed end to the other free end is 1 _H , and the impact is from the fixed end. the distance until the excitation point striking is added by parts XH, when the .XI _n criteria function of the vibration mode, the equivalent mass M _e in the excitation point is represented by the following formula (a) The striking section is a swing-type swing lever that strikes the excitation point, and its inertia moment is I. The distance from the center of rotation to the strike point that strikes the excitation point is _Xb. and when the equivalent mass m _e is the power generation apparatus characterized by being represented by the following formula (B).

M ₀ = MH / (Ξ _n (XH / 1 H)) ² (A) m = I _b / x _b ² (B)

4. In claim 1, the collision factor of the resonator element and the striking part is taken as e, power generator the equivalent mass m _e and M _e is characterized by satisfying the following formula (C).

M _c > ((2-e + 3 · 7 Γ + 2) / 3 · π ■ e) xm _e

(C)

5. The vibrating reed according to claim 1, wherein the vibrating reed is mounted in a cantilever shape, and the striking portion is a node in a secondary mode of the vibrating reed slightly returned from a free end to a fixed end of the vibrating reed. A power generator characterized by hitting nearby.

6. The power generator according to claim 1, wherein the vibrating reed is mounted in a cantilever shape, and a weight is added to a free end of the vibrating reed.

7. In claim 6, the mass of the cantilever portion of the vibrating reed is M _H , the distance from the fixed end to the other free end is 1 _H , and the hitting portion applies a hit from the fixed end. distance x _H to excitation point -! _n .XI criteria function of the vibration modes, the mass of the weight is taken as ^ ^, the equivalent mass M _e in the excitation point following formula (D) A power generator characterized by the following.

M _e = M _a + M _H / (Ξ _η (Χ Η / 1 Η)) ²

8. The power generator according to claim 6, wherein the weight has a concave portion that is open on the side of the free end, and the hitting portion is a vibration lever that hits the inside of the concave portion. .

9. The method according to claim 1, wherein a plurality of vibrating bars are provided.

¾, i¾ ¾ o

10. The power generator according to claim 1, wherein the hitting portion is at least one ball that moves inside a groove formed around the vibrating piece.

1 1. A portable device comprising: the power generation device according to claim 1; and a processing device operable by the power output from the power generation device.

1 2. A case for accommodating the power generating device according to claim 1, a rotating weight rotatably mounted inside the case, and a train train for increasing the speed of movement of the rotating weight and transmitting the movement to the hitting portion. And

The portable device, wherein the hitting portion is a vibration lever that is driven to rotate in conjunction with the train wheel and collides with the vibrating piece.

13. The portable device according to claim 12, wherein the case is an arm-mounted type.

14. The device according to claim 12, wherein the vibrating lever includes a lever that is driven to rotate by the wheel train. One end of the driving lever and one end of the vibrating lever abut, and the vibrating lever pivots. A portable device characterized by being driven.

1 5. The method according to claim 12, wherein the vibration lever is a center of rotation and a center of gravity. Is a portable device characterized by substantially matching.