US9271386B2 - Electrical apparatus and method for producing electrical apparatus - Google Patents
Electrical apparatus and method for producing electrical apparatus Download PDFInfo
- Publication number
- US9271386B2 US9271386B2 US13/927,645 US201313927645A US9271386B2 US 9271386 B2 US9271386 B2 US 9271386B2 US 201313927645 A US201313927645 A US 201313927645A US 9271386 B2 US9271386 B2 US 9271386B2
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- Prior art keywords
- contact
- heat dissipator
- main surface
- flatness
- electrical component
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- Expired - Fee Related, expires
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- 238000004519 manufacturing process Methods 0.000 title description 19
- 230000017525 heat dissipation Effects 0.000 claims description 124
- 238000004891 communication Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 description 30
- 238000000034 method Methods 0.000 description 17
- 230000005540 biological transmission Effects 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 6
- 239000013307 optical fiber Substances 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
- H05K1/0203—Cooling of mounted components
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
- H05K7/20509—Multiple-component heat spreaders; Multi-component heat-conducting support plates; Multi-component non-closed heat-conducting structures
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/209—Heat transfer by conduction from internal heat source to heat radiating structure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49128—Assembling formed circuit to base
Definitions
- the present invention relates to an electrical apparatus and a method for producing the electrical apparatus, and in particular, to an electrical apparatus provided with a heat dissipator, and a method for producing the electrical apparatus.
- Patent Literature 1 discloses the following technology, for example. That is, a printed circuit board heat dissipation component is attached to a printed circuit board for dissipating heat generated in an electronic component mounted on the printed circuit board, and the heat dissipation component includes: an attachment part which is inserted in a lead inserting hole of the printed circuit board and soldered on the printed circuit board together with a lead of the electronic component; and a heat dissipation part rising from the board surface as an integral body with the attachment part.
- a structure for mounting a power device is considered. Since a power device generates heat to a great extent, the following structure is conceivable, for example, in which: a board having a power device mounted thereon and a heat dissipator are brought into contact with each other, and the board and the heat dissipator are fixed together with a screw, to dissipate heat.
- Patent Literature 1 does not disclose a structure for solving such a problem.
- An object of the present invention is to provide an electrical apparatus and a method for producing the electrical apparatus that can improve the heat dissipation performance and can prevent increase of production costs.
- an electrical apparatus including: a board which includes a first main surface and a second main surface and in which an electrical component is attached to the first main surface; a heat dissipator; and a fixing member which fixes the second main surface of the board and the heat dissipator together in such a manner as to be in contact with each other, by passing through the board from the first main surface to the second main surface to be inserted in the heat dissipator, wherein in an opposing part facing the board, the opposing part being on a surface of the heat dissipator, a contact part which is brought into contact with a first region of the second main surface corresponding to the electrical component and a surrounding region of the electrical component and which is brought into contact with a second region of the second main surface corresponding to the fixing member and a surrounding region of the fixing member protrudes relative to a portion of the opposing part other than the contact part, and the degree of flatness of a contact surface, in
- the electrical apparatus is an electrical apparatus including: a board which includes a first main surface and a second main surface and to which an electrical component is attached; a heat dissipator, and a fixing member which fixes the board and the heat dissipator together by passing through the board from the first main surface to the second main surface to be inserted in the heat dissipator, wherein the electrical component projects from the second main surface of the board, and is in contact with the heat dissipator at a tip of a projecting portion of the electrical component or in contact with the heat dissipator via a first heat dissipation member provided between the electrical component and the heat dissipator, and on the surface of the heat dissipator, the degree of flatness of a contact surface that is brought into contact with the electrical component or the first heat dissipation member is higher than the degree of flatness of a surface of an opposing part other than the contact surface, the opposing part facing the board.
- the fixing member reaches the heat dissipator by being inserted through a second heat dissipation member which is in close contact with the board and the heat dissipator between the board and the heat dissipator, and on the surface of the heat dissipator, the degree of flatness of the contact surface that is brought into contact with the electrical component or the first heat dissipation member and the degree of flatness of a contact surface that is brought into contact with the second heat dissipation member are higher than the degree of flatness of a surface of the opposing part other than these contact surfaces.
- the second heat dissipation member by providing the second heat dissipation member and by increasing the degree of flatness of the contact surface, on the surface of the heat dissipator, that is brought into contact with the second heat dissipation member, it is possible to promote heat conduction from the electrical component to the heat dissipator.
- the heat dissipation effect can be further enhanced.
- a contact part which is brought into contact with a member region of the second main surface corresponding to the fixing member and a surrounding region of the fixing member protrudes relative to a portion of the opposing part other than the contact part, and the degree of flatness of the contact surface, on the surface of the heat dissipator, that is brought into contact with the electrical component or the first heat dissipation member, and the degree of flatness of a contact surface, in the contact part, that is brought into contact with the member region are higher than the degree of flatness of a surface of the opposing part other than these contact surfaces.
- the heat dissipator, and the portion of the board corresponding to the electrical component or the heat dissipation member and the portion of the board corresponding to the fixing member and its surrounding region into contact with each other, compared with a structure where the heat dissipator is brought into contact with one of the portion of the board corresponding to the electrical component or the heat dissipation member and the portion of the board corresponding to the fixing member and its surrounding region, the heat dissipation performance can be improved.
- the electrical apparatus is an electrical apparatus including: a board which includes a first main surface and a second main surface and in which an electrical component is attached to the first main surface; a heat dissipator; and a fixing member which fixes the second main surface of the board and the heat dissipator together in such a manner as to be in contact with each other, by passing through the board from the first main surface to the second main surface to be inserted in the heat dissipator, wherein in an opposing part facing the board , the opposing part being on a surface of the heat dissipator, a contact part which is brought into contact with a component region of the second main surface corresponding to the electrical component and a surrounding region of the electrical component protrudes relative to a portion of the opposing part other than the contact part, and the fixing member reaches the heat dissipator by being inserted through a heat dissipation member which is in close contact with the board and the heat dissipator between the board and
- the electrical component is attached to a vicinity of the fixing member.
- the electrical apparatus is a radio communication device which includes an amplifier for amplifying a radio signal, as the electrical component.
- a method for producing an electrical apparatus is a method for producing an electrical apparatus, the method including: a step of preparing a board which includes a first main surface and a second main surface and in which an electrical component is attached to the first main surface, and a fixing member to be passed through the board from the first main surface to the second main surface; a step of casting a heat dissipator in which, in an opposing part facing the board, the opposing part being on a surface of the heat dissipator, a contact part which is brought into contact with a first region of the second main surface corresponding to the electrical component and a surrounding region of the electrical component and which is brought into contact with a second region of the second main surface corresponding to the fixing member and a surrounding region of the fixing member protrudes relative to a portion of the opposing part other than the contact part; a step of working the heat dissipator such that the degree of flatness of a contact surface, in the contact part,
- a method for producing an electrical apparatus is a method for producing an electrical apparatus, the method including: a step of preparing a board which includes a first main surface and a second main surface and to which an electrical component is attached, and a fixing member to be passed through the board from the first main surface to the second main surface; a step of causing the electrical component to project from the second main surface of the board to be brought into contact with a heat dissipator at a tip of a projecting portion of the electrical component, or bringing the electrical component into contact with the heat dissipator via a heat dissipation member provided between the electrical component and the heat dissipator; a step of fixing the second main surface of the board and the electrical component, and the heat dissipator together, by passing the fixing member through the board from the first main surface to the second main surface to be inserted in the heat dissipator; and a step of working, before the step of bringing the electrical component into contact and the step of fixing
- FIG. 1 shows a structure of an electrical apparatus according to a first embodiment.
- FIG. 2 is a functional block diagram of a remote radio head according to the first embodiment.
- FIG. 3 shows a mounting structure of a comparative example of the electrical apparatus according to the first embodiment.
- FIG. 4 is a perspective view showing a mounting structure of the electrical apparatus according to the first embodiment.
- FIG. 5 is a cross-sectional view showing the mounting structure of the electrical apparatus according to the first embodiment.
- FIG. 6 is a flow chart defining the procedure for producing the electrical apparatus according to the first embodiment.
- FIG. 7 is a cross-sectional view showing a method for working a surface of a heat dissipator in comparative example 1 of the electrical apparatus according to the first embodiment.
- FIG. 8 is a cross-sectional view showing a method for working a surface of the heat dissipator in comparative example 2 of the electrical apparatus according to the first embodiment.
- FIG. 9 is a cross-sectional view showing a method for working a surface of a heat dissipator in the electrical apparatus according to the first embodiment of the present invention.
- FIG. 10 is a cross-sectional view showing a mounting structure of a modification of the electrical apparatus according to the first embodiment of the present invention.
- FIG. 11 is a cross-sectional view showing a mounting structure of an electrical apparatus according to a second embodiment of the present invention.
- FIG. 12 is a flow chart defining the procedure for producing the electrical apparatus according to the second embodiment of the present invention.
- FIG. 13 is a cross-sectional view showing a mounting structure of a modification of the electrical apparatus according to the second embodiment of the present invention.
- FIG. 14 is a cross-sectional view showing a mounting structure of an electrical apparatus according to a third embodiment of the present invention.
- FIG. 15 is a flow chart defining the procedure for producing the electrical apparatus according to the third embodiment of the present invention.
- FIG. 16 is a cross-sectional view showing a mounting structure of an electrical apparatus according to a fourth embodiment of the present invention.
- FIG. 17 is a flow chart defining the procedure for producing the electrical apparatus according to the fourth embodiment of the present invention.
- FIG. 1 shows a structure of an electrical apparatus according to a first embodiment of the present invention.
- an electrical apparatus 201 is a radio communication device, for example, and includes one or a plurality of remote radio heads (RRH) 101 , and a body device 102 .
- RRH remote radio heads
- Each remote radio head 101 is a device obtained by separating a part that performs transmission and reception of radio signals, from a radio base station device used in mobile communication.
- the remote radio head 101 is attached to an antenna pole 104 installed on the roof of a building or the like. Further, an antenna 103 is attached to the antenna pole 104 .
- the remote radio head 101 converts a radio signal received from a radio terminal device 301 via the antenna 103 into a digital signal, and outputs the digital signal to the body device 102 via an optical fiber 105 . Further, the remote radio head 101 converts a digital signal received from the body device 102 via the optical fiber 105 into a radio signal, and transmits the radio signal to the radio terminal device 301 via the antenna 103 .
- FIG. 2 is a functional block diagram of a remote radio head according to the first embodiment of the present invention.
- the remote radio head 101 includes a signal processing section 81 , a radio transmission section 71 , a radio reception section 72 , and a transmission and reception filter 86 .
- the radio transmission section 71 includes a digital/analog converter (DAC) 82 , a modulator 83 , a driver amplifier 84 , a power amplifier 85 , and an oscillator 87 .
- the radio reception section 72 includes reception amplifiers 89 and 90 , a mixer 91 , a BPF (Band Pass Filter) 92 , an analog/digital converter (ADC) 93 , and an oscillator 94 .
- the signal processing section 81 is a DSP (Digital Signal Processor), for example.
- the signal processing section 81 performs signal processing on a digital signal received from the body device 102 via the optical fiber 105 , and outputs the resultant signal to the radio transmission section 71 .
- the radio transmission section 71 converts the digital signal received from the signal processing section 81 into an analog signal, converts the converted analog signal into a radio signal, that is, a signal in an RF (Radio Frequency) band, and transmits the radio signal to the radio terminal device 301 .
- a radio signal that is, a signal in an RF (Radio Frequency) band
- the radio reception section 72 receives a radio signal from the radio terminal device 301 , converts the radio signal into an IF (Intermediate Frequency) signal, converts the converted IF signal into a digital signal, and outputs the digital signal to the signal processing section 81 .
- IF Intermediate Frequency
- the signal processing section 81 performs various types of signal processing on the digital signal received from the radio reception section 72 , and outputs the resultant signal to the body device 102 via the optical fiber 105 .
- the signal processing section 81 outputs a digital signal received from the body device 102 to the digital/analog converter 82 .
- the digital/analog converter 82 converts the digital signal received from the signal processing section 81 into an analog signal, and outputs the analog signal to the modulator 83 .
- the oscillator 87 generates a locally generated signal and outputs this signal to the modulator 83 .
- the modulator 83 multiples the analog signal in a baseband received from the digital/analog converter 82 by the locally generated signal received from the oscillator 87 , thereby performing, for example, a quadrature modulation on the analog signal received from the digital/analog converter 82 to be converted into a radio signal, and outputs the radio signal to the driver amplifier 84 .
- the driver amplifier 84 amplifies the radio signal received from the modulator 83 , and outputs the resultant signal to the power amplifier 85 .
- the power amplifier 85 further amplifies the radio signal received from the driver amplifier 84 .
- the radio signal amplified by the power amplifier 85 is transmitted, via the transmission and reception filter 86 and the antenna 103 , to the radio terminal device 301 .
- the transmission and reception filter 86 removes an unwanted signal from the radio signal received from the power amplifier 85 , and outputs the resultant signal to the antenna 103 . Further, the transmission and reception filter 86 removes noise from a radio signal received from the antenna 103 , and outputs the resultant signal to the reception amplifier 89 .
- the transmission and reception filter 86 is a band-pass filter, for example, and outputs a signal obtained by attenuating, from among frequency components of the received radio signal, components outside a predetermined frequency band.
- the reception amplifier 89 is an LNA (Low Noise Amplifier), for example, and receives the radio signal from the radio terminal device 301 via the antenna 103 and the transmission and reception filter 86 , amplifies the received radio signal, and outputs the resultant signal to the reception amplifier 90 .
- LNA Low Noise Amplifier
- the reception amplifier 90 is an LNA, for example, and further amplifies the radio signal received from the reception amplifier 89 and outputs the resultant signal to the mixer 91 .
- the oscillator 94 generates a locally generated signal and outputs this signal to the mixer 91 .
- the mixer 91 multiplies the radio signal received from the reception amplifier 90 by the locally generated signal received from the oscillator 94 , thereby converting the radio signal received from the reception amplifier 90 into an IF signal, and outputting the IF signal to the band-pass filter 92 .
- the band-pass filter 92 outputs, to the analog/digital converter 93 , a signal obtained by attenuating, from among frequency components of the IF signal received from the mixer 91 , components outside a predetermined frequency band.
- the analog/digital converter 93 converts the IF signal received from the band-pass filter 92 into a digital signal, and outputs the digital signal to the signal processing section 81 .
- the signal processing section 81 converts the digital signal in the IF band received from the analog/digital converter 93 into a digital signal in the baseband, through quadrature demodulation, for example, and outputs the digital signal to the body device 102 via the optical fiber 105 .
- FIG. 3 shows a mounting structure of a comparative example of the electrical apparatus according to the first embodiment of the present invention.
- an electrical apparatus 200 includes a printed circuit board 1 , a heat dissipator 2 , a fixing member 3 , and an electrical component 4 .
- the electrical component 4 is the power amplifier 85 shown in FIG. 2 , for example.
- the fixing member 3 is a screw, for example.
- the printed circuit board 1 and the heat dissipator 2 are provided with tapped holes 5 and 6 , respectively.
- the fixing member 3 fixes the printed circuit board 1 and the heat dissipator 2 together in such a manner as to be in contact with each other, by passing through the printed circuit board 1 via the tapped hole 5 to be inserted in the tapped hole 6 in the heat dissipator 2 .
- heat dissipation is performed by bringing the printed circuit board 1 having the electrical component 4 mounted thereon and the heat dissipator 2 into contact with each other and by fixing them with a screw.
- the electrical apparatus according to the first embodiment of the present invention solves the above problem, by adopting the following mounting structure.
- parts that are the same as or correspond to those in FIG. 3 are denoted by the same reference characters, and description thereof is not repeated.
- FIG. 4 is a perspective view showing a mounting structure of the electrical apparatus according to the first embodiment of the present invention.
- FIG. 5 is a cross-sectional view showing the mounting structure of the electrical apparatus according to the first embodiment of the present invention.
- the electrical apparatus 201 includes the printed circuit board 1 , a heat dissipator 11 , the fixing member 3 , and the electrical component 4 .
- the printed circuit board 1 includes a main surface SF 1 and a main surface SF 2 , and to the main surface SF 1 , the electrical component 4 is attached.
- the fixing member 3 fixes the main surface SF 2 of the printed circuit board 1 and the heat dissipator 11 together in such a manner as to be in contact with each other, by passing through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 to be inserted in the heat dissipator 11 .
- a contact part 22 which is brought into contact with a component region A 1 of the main surface SF 2 corresponding to the electrical component 4 and its surrounding region and which is brought into contact with a screw region A 2 of the main surface SF 2 corresponding to the fixing member 3 and its surrounding region, protrudes relative to the portion of the opposing part 21 other than the contact part 22 .
- the screw region A 2 is a region corresponding to the fixing member 3 being a screw and a washer 7 , for example.
- the degree of flatness of the contact surface, in the contact part 22 , that is brought into contact with the component region A 1 and the screw region A 2 is higher than the degree of flatness of the surface of the opposing part 21 other than the contact surface.
- the degree of contact between the printed circuit board 1 and the heat dissipator 11 is highest. Further, the fixing member 3 itself promotes heat conduction from the printed circuit board 1 to the heat dissipator 11 . Accordingly, in the vicinity of the tapped hole 5 and the tapped hole 6 , the heat dissipation effect is significantly enhanced.
- the electrical component 4 is attached in the vicinity of the fixing member 3 . That is, in the electrical apparatus 201 , a tapped hole is provided in the vicinity of the electrical component 4 , in addition to portions where tapped holes are structurally needed. With this structure, the heat dissipation effect can further be enhanced.
- FIG. 6 is a flow chart defining the procedure for producing the electrical apparatus according to the first embodiment of the present invention.
- the printed circuit board 1 which includes the main surface SF 1 and the main surface SF 2 and in which the electrical component 4 is attached to the main surface SF 1 is prepared. Further, the fixing member 3 to be passed through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 is prepared (step S 1 ).
- the heat dissipator 11 is cast in which, in the opposing part 21 facing the printed circuit board 1 , the contact part 22 , which is brought into contact with the component region A 1 of the main surface SF 2 corresponding to the electrical component 4 and its surrounding region and which is brought into contact with the screw region A 2 of the main surface SF 2 corresponding to the fixing member 3 and its surrounding region, protrudes relative to the portion of the opposing part 21 other than the contact part 22 (step S 2 ).
- the heat dissipator 11 is worked such that the degree of flatness of the contact surface, in the contact part 22 , that is brought into contact with the component region A 1 and the screw region A 2 becomes higher than the degree of flatness of the surface of the opposing part 21 other than the contact surface (step S 3 ).
- step S 4 by passing the fixing member 3 through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 to be inserted in the heat dissipator 11 , the main surface SF 2 of the printed circuit board 1 and the heat dissipator 11 are fixed together in such a manner as to be in contact with each other (step S 4 ).
- FIG. 7 is a cross-sectional view showing a method for working a surface of a heat dissipator in comparative example 1 of the electrical apparatus according to the first embodiment of the present invention.
- FIG. 8 is a cross-sectional view showing a method for working a surface of the heat dissipator in comparative example 2 of the electrical apparatus according to the first embodiment of the present invention.
- FIG. 9 is a cross-sectional view showing a method for working a surface of a heat dissipator in the electrical apparatus according to the first embodiment of the present invention.
- FIG. 10 is a cross-sectional view showing a mounting structure of a modification of the electrical apparatus according to the first embodiment of the present invention.
- the present invention is not limited to the structure provided with the contact part 22 which is brought into contact with both the region A 1 and the region A 2 and which protrudes relative to the portion of the opposing part 21 other than the contact part 22 .
- the present invention may have a structure in which a contact part 23 which is brought into contact with the region A 1 and a contact part 24 which is brought into contact with the region A 2 may be separately provided.
- the fixing member 3 fixes the main surface SF 2 of the printed circuit board 1 and the heat dissipator 11 together in such a manner as to be in contact with each other, by passing through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 to be inserted in the heat dissipator 11 .
- the contact part 22 which is brought into contact with the component region A 1 of the main surface SF 2 corresponding to the electrical component 4 and its surrounding region and which is brought into contact with the screw region A 2 of the main surface SF 2 corresponding to the fixing member 3 and its surrounding region, protrudes relative to the portion of the opposing part 21 other than the contact part 22 .
- the degree of flatness of the contact surface, in the contact part 22 that is brought into contact with the component region A 1 and the screw region A 2 is higher than the degree of flatness of the surface of the opposing part 21 other than the contact surface.
- the heat dissipator 11 is produced through casting such that only the vicinity of the tapped hole and the vicinity of the power device protrude in the opposing part 21 . Then, by increasing the degree of flatness only of the protruding contact part 22 , the degree of contact between the printed circuit board 1 and the heat dissipator 11 is increased in the portion where the heat dissipation effect is especially enhanced.
- This structure can realize both low surface working costs and a high heat dissipation effect. That is, it is possible to minimize the area having an increased degree of flatness, and to obtain a sufficient heat dissipation effect.
- the electrical component 4 is attached to the vicinity of the fixing member 3 .
- the electrical component 4 can be arranged in a region having a high degree of contact with the heat dissipator 11 , and heat generated from the electrical component 4 can be conducted to the heat dissipator 11 via the fixing member 3 .
- the heat dissipation effect can further be enhanced.
- the electrical apparatus is a radio communication device including, as the electrical component 4 , an amplifier such as the power amplifier 85 for amplifying a radio signal.
- the present embodiment relates to an electrical apparatus in which the heat dissipation structure is changed compared with the electrical apparatus according to the first embodiment.
- the content other than that described below is the same as described with respect to the electrical apparatus according to the first embodiment.
- FIG. 11 is a cross-sectional view showing a mounting structure of an electrical apparatus according to a second embodiment of the present invention.
- an electrical apparatus 202 further includes a heat dissipation member 33 , and includes a heat dissipator 12 instead of the heat dissipator 11 .
- the printed circuit board 1 includes the main surface SF 1 and the main surface SF 2 , and the electrical component 4 is attached to the printed circuit board 1 .
- the fixing member 3 fixes the printed circuit board 1 and the heat dissipator 12 in such a manner as to be spaced apart from each other, by passing through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 to be inserted in the heat dissipator 12 .
- the fixing member 3 reaches the heat dissipator 12 by being inserted through the heat dissipation member 33 which is in close contact with the printed circuit board 1 and the heat dissipator 12 between the printed circuit board 1 and the heat dissipator 12 .
- the electrical component 4 includes a projecting portion projected from the main surface SF 2 of the printed circuit board 1 and a tip of the projecting portion is in contact with the heat dissipator 12 .
- the degree of flatness of the contact surface that is brought into contact with the electrical component 4 and the degree of flatness of the contact surface that is brought into contact with the heat dissipation member 33 are higher than the degree of flatness of the surface of the opposing part 21 other than these contact surfaces, the opposing part 21 facing the printed circuit board 1 .
- FIG. 12 is a flow chart defining the procedure for producing the electrical apparatus according to the second embodiment of the present invention.
- the printed circuit board 1 which includes the main surface SF 1 and the main surface SF 2 and to which the electrical component 4 is attached, the heat dissipator 12 , the fixing member 3 , and the heat dissipation member 33 are prepared (step S 11 ).
- the heat dissipator 12 is worked such that, on the surface of the heat dissipator 12 , the degree of flatness of the contact surface that is brought into contact with the electrical component 4 and the degree of flatness of the contact surface that is brought into contact with the heat dissipation member 33 become higher than the degree of flatness of the surface of the opposing part 21 other than these contact surfaces, the opposing part 21 facing the printed circuit board 1 (step S 12 ).
- the electrical component 4 is caused to project from the main surface SF 2 of the printed circuit board 1 to be brought into contact with the heat dissipator 12 , at the tip of the projecting portion of the electrical component 4 (step S 13 ).
- step S 14 by passing the fixing member 3 through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 to be inserted in the heat dissipator 12 via the heat dissipation member 33 , the printed circuit board 1 and the heat dissipator 12 are fixed in such a manner as to be spaced apart from each other (step S 14 ).
- FIG. 13 is a cross-sectional view showing a mounting structure of a modification of the electrical apparatus according to the second embodiment of the present invention.
- the electrical apparatus 202 further includes a heat dissipation member 32 .
- the present invention is not limited to the structure in which the electrical component 4 is directly brought into contact with the heat dissipator 12 , as shown in FIG. 11 .
- the present invention may have a structure in which the electrical component 4 is brought into contact with the heat dissipator 12 via the heat dissipation member 32 provided between the electrical component 4 and the heat dissipator 12 .
- the degree of flatness of the contact surface that is brought into contact with the heat dissipation member 32 and the degree of flatness of the contact surface that is brought into contact with the heat dissipation member 33 are higher than the degree of flatness of the surface of the opposing part 21 other than these contact surfaces, the opposing part 21 facing the printed circuit board 1 .
- the fixing member 3 fixes the printed circuit board 1 and the heat dissipator 12 by passing through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 to be inserted in the heat dissipator 12 .
- the electrical component 4 projects from the main surface SF 2 of the printed circuit board 1 and is in contact with the heat dissipator 12 at the tip of the projecting portion of the electrical component 4 .
- the electrical component 4 is contact with the heat dissipator 12 via the heat dissipation member 32 provided between the electrical component 4 and the heat dissipator 12 .
- the degree of flatness of the contact surface that is brought into contact with the electrical component 4 or the heat dissipation member 32 is higher than the degree of flatness of the surface of the opposing part 21 other than the contact surface, the opposing part 21 facing the printed circuit board 1 .
- the degree of contact between the printed circuit board 1 and the heat dissipator 12 is increased in the portion where the heat dissipation effect is especially enhanced.
- the fixing member 3 reaches the heat dissipator 12 by being inserted through the heat dissipation member 33 which is in close contact with the printed circuit board 1 and the heat dissipator 12 between the printed circuit board 1 and the heat dissipator 12 .
- the degree of flatness of the contact surface that is brought into contact with the electrical component 4 or the heat dissipation member 32 and the degree of flatness of the contact surface that is brought into contact with the heat dissipation member 33 are higher than the degree of flatness of the surface of the opposing part 21 other than these contact surfaces.
- heat conduction from the electrical component 4 to the heat dissipator 12 can be promoted.
- the heat dissipation effect can further be enhanced.
- the heat dissipation member 32 is located between the heat dissipator 12 and the electrical component 4 , and that one end of the heat dissipation member 32 is in contact with the heat dissipator 12 .
- the heat dissipation member 32 may be provided between the electrical component 4 projecting from the main surface SF 2 of the printed circuit board 1 and the heat dissipator 12 , the other end of the heat dissipation member 32 may be located inside the printed circuit board, or the other end of the heat dissipation member 32 may project from the main surface SF 1 .
- heat from the electrical component 4 is conveyed directly or via the heat dissipation member 32 to the heat dissipator 12 .
- the heat dissipation member 33 instead of the heat dissipation member 33 , a member having low heat dissipation ability may be provided.
- the present embodiment relates to an electrical apparatus in which the heat dissipation structure is changed compared with the electrical apparatus according to the first embodiment.
- the content other than that described below is the same as described with respect to the electrical apparatus according to the first embodiment.
- FIG. 14 is a cross-sectional view showing a mounting structure of an electrical apparatus according to a third embodiment of the present invention.
- an electrical apparatus 203 further includes the heat dissipation member 33 , and includes a heat dissipator 13 instead of the heat dissipator 11 .
- the printed circuit board 1 includes the main surface SF 1 and the main surface SF 2 and the electrical component 4 is attached to the main surface SF 1 .
- the fixing member 3 fixes the main surface SF 2 of the printed circuit board 1 and the heat dissipator 13 together in such a manner as to be in contact with each other, by passing through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 to be inserted in the heat dissipator 13 .
- the fixing member 3 reaches the heat dissipator 13 by being inserted through the heat dissipation member 33 which is in close contact with the printed circuit board 1 and the heat dissipator 13 between the printed circuit board 1 and the heat dissipator 13 .
- the contact part 22 which is brought into contact with the component region A 1 of the main surface SF 2 corresponding to the electrical component 4 and its surrounding region, protrudes relative to the portion of the opposing part 21 other than the contact part 22 .
- the degree of flatness of the contact surface, in the contact part 22 , that is brought into contact with the component region A 1 and the degree of flatness of the contact surface, in the heat dissipator 13 , that is brought into contact with the heat dissipation member 33 are higher than the degree of flatness of the surface of the opposing part 21 other than these contact surfaces.
- FIG. 15 is a flow chart defining the procedure for producing the electrical apparatus according to the third embodiment of the present invention.
- the printed circuit board 1 which includes the main surface SF 1 and the main surface SF 2 and in which the electrical component 4 is attached to the main surface SF 1 , the heat dissipator 13 , the fixing member 3 , and the heat dissipation member 33 are prepared (step S 21 ).
- the heat dissipator 13 is cast in which, in the opposing part 21 facing the printed circuit board 1 , the contact part 22 , which is brought into contact with the component region A 1 of the main surface SF 2 corresponding to the electrical component 4 and its surrounding region, protrudes relative to the portion of the opposing part 21 other than the contact part 22 (step S 22 ).
- the heat dissipator 13 is worked such that the degree of flatness of the contact surface, in the contact part 22 , that is brought into contact with the component region Al, and the degree of flatness of the contact surface, in the heat dissipator 13 , that is brought into contact with the heat dissipation member 33 are higher than the degree of flatness of the surface of the opposing part 21 other than these contact surfaces (step S 23 ).
- step S 24 by passing the fixing member 3 through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 to be inserted in the heat dissipator 13 via the heat dissipation member 33 , the main surface SF 2 of the printed circuit board 1 and the heat dissipator 13 are fixed together in such as a manner as to be in contact with each other (step S 24 ).
- the fixing member 3 fixes the main surface SF 2 of the printed circuit board 1 and the heat dissipator 13 together, by passing through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 to be inserted in the heat dissipator 13 .
- the contact part 22 which is brought into contact with the component region A 1 of the main surface SF 2 corresponding to the electrical component 4 and its surrounding region, protrudes relative to the portion of the opposing part 21 other than the contact part 22 .
- the degree of flatness of the contact surface, in the contact part 22 that is brought into contact with the component region A 1 is higher than the degree of flatness of the surface of the opposing part 21 other than the contact surface.
- the heat dissipator 13 is produced through casting such that only the vicinity of the power device protrudes in the opposing part 21 . Then, by increasing the degree of flatness of the protruding contact part 22 , the degree of contact between the printed circuit board 1 and the heat dissipator 13 is increased in the portion where the heat dissipation effect is especially enhanced.
- the fixing member 3 reaches the heat dissipator 13 by being inserted through the heat dissipation member 33 which is in close contact with the printed circuit board 1 and the heat dissipator 13 between the printed circuit board 1 and the heat dissipator 13 .
- the degree of flatness of the contact surface, in the contact part, that is brought into contact with the component region A 1 and the degree of flatness of the contact surface, in the heat dissipator 13 , that is brought into contact with the heat dissipation member 33 are higher than the degree of flatness of the surface of the opposing part 21 other than these contact surfaces.
- the present embodiment relates to an electrical apparatus in which the heat dissipation structure is changed compared with the electrical apparatus according to the first embodiment.
- the content other than that described below is the same as described with respect to the electrical apparatus according to the first embodiment.
- FIG. 16 is a cross-sectional view showing a mounting structure of an electrical apparatus according to a fourth embodiment of the present invention.
- an electrical apparatus 204 includes a heat dissipator 14 instead of the heat dissipator 11 , compared with the electrical apparatus according to the first embodiment of the present invention.
- the printed circuit board 1 includes the main surface SF 1 and the main surface SF 2 , and the electrical component 4 is attached to the printed circuit board 1 .
- the fixing member 3 fixes the main surface SF 2 of the printed circuit board 1 and the heat dissipator 14 together in such a manner as to be in contact with each other, by passing through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 to be inserted in the heat dissipator 14 .
- the contact part 22 which is brought into contact with the screw region A 2 of the main surface SF 2 corresponding to the fixing member 3 and its surrounding region, protrudes relative to the portion of the opposing part 21 other than the contact part 22 .
- the electrical component 4 includes a projecting, portion from the main surface SF 2 of the printed circuit board 1 , and a tip of the projecting portion is in contact with the heat dissipator 14 .
- the degree of flatness of the contact surface, in the contact part 22 , that is brought into contact with the screw region A 2 and the degree of flatness of the contact surface, in the opposing part 21 , that is brought into contact with the electrical component 4 or the heat dissipation member 32 are higher than the degree of flatness of the surface of the opposing part 21 other than these contact surfaces.
- FIG. 17 is a flow chart defining the procedure for producing the electrical apparatus according to the fourth embodiment of the present invention.
- the printed circuit board 1 which includes the main surface SF 1 and the main surface SF 2 and to which the electrical component 4 is attached, the heat dissipator 14 , the fixing member 3 to be passed through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 are prepared (step S 31 ).
- the heat dissipator 14 is cast in which, in the opposing part 21 facing the printed circuit board 1 , the contact part 22 , which is brought into contact with the screw region A 2 of the main surface SF 2 corresponding to the fixing member 3 and its surrounding region, protrudes relative to the portion of the opposing part 21 other than the contact part 22 (step S 32 ).
- the heat dissipator 14 is worked such that the degree of flatness of the contact surface, in the contact part 22 , that is brought into contact with the screw region A 2 , and the degree of flatness of the contact surface, in the opposing part 21 , that is brought into contact with the electrical component 4 or the heat dissipation member 32 are higher than the degree of flatness of the surface of the opposing part 21 other than these contact surfaces (step S 33 ).
- the electrical component 4 is caused to project from the main surface SF 2 of the printed circuit board 1 to be brought into contact with the heat dissipator 14 , at the tip of the projecting portion of the electrical component 4 , or the electrical component 4 is brought into contact with the heat dissipator 14 , via the heat dissipation member 32 provided between the electrical component 4 and the heat dissipator 14 (step S 34 ).
- step S 35 by passing the fixing member 3 through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 to be inserted in the heat dissipator 14 , the main surface SF 2 of the printed circuit board 1 and the electrical component 4 , and the heat dissipator 14 are fixed together in such a manner as to be contact with each other (step S 35 ).
- the fixing member 3 fixes the main surface SF 2 of the printed circuit board 1 and the heat dissipator 14 together in such a manner as to be in contact with each other, by passing through the printed circuit board 1 from the main surface SF 1 to the main surface SF 2 to be inserted in the heat dissipator 14 .
- the contact part 22 which is brought into contact with the screw region A 2 of the main surface SF 2 corresponding to the fixing member 3 and its surrounding region, protrudes relative to the portion of the opposing part 21 other than the contact part 22 .
- the electrical component 4 projects from the main surface SF 2 of the printed circuit board 1 , and is in contact with the heat dissipator 14 at the tip of the projecting portion of the electrical component 4 or is in contact with the heat dissipator 14 via the heat dissipation member 32 provided between the electrical component 4 and the heat dissipator 14 . Further, the degree of flatness of the contact surface, in the contact part 22 , that is brought into contact with the screw region A 2 , and the degree of flatness of the contact surface, in the opposing part 21 , that is brought into contact with the electrical component 4 or the heat dissipation member 32 are higher than the degree of flatness of the surface of the opposing part 21 other than these contact surfaces.
- the heat dissipator 14 is produced through casting such that only the vicinity of the tapped hole protrudes in the opposing part 21 . Then, by increasing, on the surface of the heat dissipator 14 , the degree of flatness only of the contact surface of the protruding contact part 22 and the contact surface that is brought into contact with the electrical component 4 or the heat dissipation member 32 , the degree of contact between the printed circuit board 1 and the heat dissipator 14 is increased in the portion where the heat dissipation effect is especially enhanced.
Abstract
Description
-
- 1 printed circuit board
- 2 heat dissipator
- 3 fixing member
- 4 electrical component
- 7 washer
- 11, 12, 13, 14 heat dissipator
- 21 opposing part
- 22 contact part
- 32, 33 heat dissipation member
- 71 radio transmission section
- 72 radio reception section
- 81 signal processing section
- 82 digital/analog converter (DAC)
- 83 modulator
- 84 driver amplifier
- 85 power amplifier
- 86 transmission and reception filter
- 87 oscillator
- 89, 90 reception amplifier
- 91 mixer
- 92 BPF
- 93 analog/digital converter (ADC)
- 94 oscillator
- 101 remote radio head
- 102 body device
- 103 antenna
- 104 antenna pole
- 201, 202, 203, 204 electrical apparatus
- A1 component region
- A2 screw region
- SF1, SF2 main surface
Claims (11)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-293484 | 2010-12-28 | ||
JP2010293484A JP2012142391A (en) | 2010-12-28 | 2010-12-28 | Electric apparatus, and method of manufacturing electric apparatus |
PCT/JP2011/068527 WO2012090546A1 (en) | 2010-12-28 | 2011-08-15 | Electrical appliance, method for manufacturing electrical appliance, and wireless communication device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/068527 Continuation WO2012090546A1 (en) | 2010-12-28 | 2011-08-15 | Electrical appliance, method for manufacturing electrical appliance, and wireless communication device |
Publications (2)
Publication Number | Publication Date |
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US20130286598A1 US20130286598A1 (en) | 2013-10-31 |
US9271386B2 true US9271386B2 (en) | 2016-02-23 |
Family
ID=46678385
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Application Number | Title | Priority Date | Filing Date |
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US13/927,645 Expired - Fee Related US9271386B2 (en) | 2010-12-28 | 2013-06-26 | Electrical apparatus and method for producing electrical apparatus |
Country Status (2)
Country | Link |
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US (1) | US9271386B2 (en) |
JP (1) | JP2012142391A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US9692367B2 (en) * | 2014-10-17 | 2017-06-27 | Daico Industries, Inc. | T-shaped power amplifier cooling plate |
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Also Published As
Publication number | Publication date |
---|---|
JP2012142391A (en) | 2012-07-26 |
US20130286598A1 (en) | 2013-10-31 |
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