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Número de publicaciónUS3466580 A
Tipo de publicaciónConcesión
Fecha de publicación9 Sep 1969
Fecha de presentación20 Jul 1966
Fecha de prioridad30 Jul 1965
También publicado comoDE1462535A1, DE1462535B2
Número de publicaciónUS 3466580 A, US 3466580A, US-A-3466580, US3466580 A, US3466580A
InventoresBull Eric William
Cesionario originalEmi Ltd
Exportar citaBiBTeX, EndNote, RefMan
Enlaces externos: USPTO, Cesión de USPTO, Espacenet
Circuit elements especially for use as scanning coils
US 3466580 A
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Descripción  (El texto procesado por OCR puede contener errores)

E. W. BULL Sept. 9, 1969 CIRCUIT ELEMENTS ESPECIALLY FOR USE AS SCANNING COILS Filed July 20, 1966 llllall FIGS FIG.2

FIGZI United States Patent U.S. Cl. 335-213 Claims ABSTRACT OF THE DISCLOSURE A circuit element which comprises a tape like structure which is intended to be rolled into a cylindrical or like form to constitute a scanning coil assembly for a cathode ray tube has conductive patterns on each side thereof comprising longitudinally extending substantially rectangular waveforms the two patterns being staggered with respect to each other.

This invention relates to circuit elements especially for use as scanning coils such as may be used for deflecting electron beams in cathode ray tubes, and especially to such coils for use with vidicon camera tubes.

Saddle type coils are frequently used to produce line and field deflection in cathode ray tubes and if such coils are to be manufactured inl arge numbers with consistant performance it is desirable that they should be produced by printed circuit techniques.

It is an object of the present invention to produce an improved circuit element which can serve as a printed circuit scanning coil.

According to the invention there is provided a coil comprising a flexible base which is rolled and which supports two overlapping and mutually insulated electrically conductive patterns each pattern comprising a repetitive circumferentially continuous waveform including circumferential parts and alternate parts transverse thereto meeting each other at right angles, one pattern being displaced relative to the other so that the circumferential parts of the respective Waveforms are staggered so that the coil as rolled is equivalent to two diametrically opposed scanning coils wherein the parts transverse to the circumferential parts extend parallel to and longitudinally of the coil surface. The pattern which extends circumferentially when the base is rolled, would extend longitudinally if the base be unrolled.

It will be appreciated that said base may comprise two layers of insulating material overlapping each other, each supporting a conductive pattern and assembled to form a unit. Alternatively the two patterns may be provided on the outer surfaces of a sheet of insulating material.

According to another aspect of the invention there is provided a coil comprising a base rolled to conform to a surface of revolution and supporting two overlapping and mutually insulated electrically conductive patterns, each pattern comprising a repetitive circumferentially extending rectangular waveform, one pattern being displaced relative to the other so that the circumferential parts of the respective waveforms are staggered. The pattern which extends circumferentially when the base is rolled, would extend longitudinally if the base be unrolled.

In order that the invention may be clearly understood and readily carried into effect, it will now be described by way of example with reference to the accompanying drawings, in which:

FIGURE 1 shows the upper side of a circuit element according to the invention,

FIGURE 2 shows the printed pattern on the underside 3,466,580 Patented Sept. 9, 1969 ice of said circuit element shown in FIGURE 1, but viewed from the upper side,

FIGURE 3 shows the combination of FIGURES 1 and 2, and

FIGURE 4 shows a scanning coil according to the invention mounted on a vidicon camera tube.

Referring to FIGURE 1, a base in the form of a strip of flexible insulating material 1 has side-by-side con tinuous conductors 2 printed on each of its major surfaces. Each conductor has alternate longitudinal and transverse parts, corresponding parts of adjacent conductors being parallel so that each conductor conforms to a pattern comprising a repetitive longitudinally extending rectangular waveform in which the alternate longitudinal and transverse parts are at right angles to each other. For the sake of simplicity in the drawing only three conductors are shown, although in practice a larger number may be required. For example in a coil for line deflection ten side-by-side conductors have been found suitable, and for field deflection twenty sideby-side conductors have been found suitable. The strip is sufliciently long to accommodate several cycles of the square-wave, for example it has been found that with the above-mentioned number of conductors four cycles are suitable for line deflection and eight cycles for field deflection. Furthermore, although as shown the conductors occupy little space compared with the space between them, this is to clarify the drawing, and in practice the conductors may be 0.1 in. wide and the space between them only 0.0-1 in.

FIGURE 2 shows the pattern of conductors which is laid down on the undersurface of the strip shown in FIG- URE 1, but as seen from the upperside. The number, spacing and pattern of conductors is similar to that on the upper surface.

FIGURE 3 illustrates the complete strip with the conductors on the upper surface as in FIGURE 1 shown in unbroken lines and the conductors on the underside as in FIGURE 2 shown in dashed lines. The conductors on the upper and under surfaces are electrically connected by through connectors indicated at 3, and connections provided for terminals for the coils as indicated at 4. The pattern on the two surfaces of the base 1, though mutually insulated by the base, are connected together by the connectors 3 to form a single series circuit in which the direction of current flow, for a particular polarity of supply voltage, is indicated by the arrow heads shown on the conductors. The two patterns provided respectively on the surfaces of the base 1 are superimposed but displaced longitudinally one relative to the other so that, whereas transverse parts of the two waveforms are in register, the longitudinal parts are staggered. The two conductive patterns therefore form a number of virtual elementary coils each of which will produce a magnetic field perpendicular to the plane of the insulating base 1, the magnetic fields having alternately opposite senses.

In use the strip as described is rolled as shown in FIGURE 4 round the vidicon tube to form a cylinder, similar parts of the square wave overlapping. For example the lines marked X and Y on the figures overlap, the distance between X and Y representing the circumference of the cylinder. As is clear, the patterns are such that successive cycles of each waveform subtend the same angle at the axis of the cylinder. The parts of the conductive patterns which were transverse before rolling the base 1 to conform to a cylindrical surface now become parallel to the cylinder axis and form two diametrically opposite axially extending groups of conductors which are the active turns of two virtual saddle type coils. In other words the cylinder or cylindrical surface to which the rolled strip now conforms is of such diameter that alternate transverse parts of the conductors on each surface of the strip are substantially diametrically opposite.

The staggered parts of the printed conductors which were longitudinal before rolling now extend circumferentially and constitute the end turns of the coils. Leads 6 are connected to the terminals 4 on said strip. Insulation must be provided to prevent overlapping conductors from contacting, and this is provided either by coating the printed circuit with an insulating layer before rolling or by interleaving a separate strip of insulating material in the strip as it is rolled.

It is to be noted that in practice the scale of the pattern longitudinally will generally require to increase gradually along the strip to take account of the increasing diameter of the cyinder as the strip is rolled to fit round the tube to ensure that similar parts of the conductor waveform continue to register. The parts of the conductors which are longitudinal when the base 1 is flat need not be spaced, or need not all be spaced, to register exactly on rolling the base. The longitudinal spacing of the transverse parts of the patterns may be selected to provide a graded distribution of the axially extended conductors or to increase the angle subtended by the active conductors, when the pattern is rolled.

Locating holes may be provided along the strip so that with their aid the strip may be rolled with the required accuracy of registration of the conductors over each other.

The spacing of the conductors and their precise location may be adjusted to produce desired field patterns.

It will be appreciated that if the circuit element is intended to be used to provide scanning coils which fit round the conical portion of a cathode ray tube instead of a cylindrical portion as described above, the flexible base insulating material will be required to differ in shape from that illustrated. It will have the shape of an annular sector, and the rectangular waveform will have to be curved to follow the curvature of said strip. The term longitudinally continuous rectangular waveform used in the specification and claims is intended to describe such a waveform as well as the straight form shown in the figures.

A single strip may have two distinct sets of conductors printed on it, one for line deflection and the other for field deflection, so that both sets of scanning coils for a cathode ray tube may be constructed by rolling a single strip. Furthermore, if electrostatic screens are required between the tube and coils and/or between the two sets of coils these may be printed on the strip and the assembly for the tube against produced by a single rolling operation.

Therefore, from one aspect, the invention provides a circuit element which comprises a thin, flexible, elongated insulating member supporting overlapping conductive patterns on its two outer surface areas. Each pattern comprises a plurality of side-by-side conductors each conforming to a substantially rectangular waveform consisting of alternate longitudinal and transverse parts at right angles to each other with the longitudinal parts of the rectangular waveform on one surface being staggered with respect to the longitudinal parts of the rectangular waveform on the other surface. Further, means are provided connecting the ends of said conductors successively to one another to connect said conductors in a single series circuit, so that the current in the transverse parts of the plurality of conductors on one surface flows in the same direction as the current in the nearest transverse parts of the conductors on the other surface.

The base need not be composed entirely of insulating material or of a single strip. It may for example consist of more than one layer of insulating material. Moreover although the invention has been described in relation to coils for a television or like pick-up tube, it is applicable to cathode ray image reproducing tubes and the like. Further, the invention is not restricted in its application to scanning coils but may be applied to the formation of resolver coils, motor coils and the like.

What I claim is:

1. A circuit element comprising a flexible base which supports two overlapping and mutually insulated electrically conductive patterns, each pattern comprising a repetitive longitudinally continuous substantially rectangular waveform consisting of alternate longitudinal and transverse parts at right angles to each other, one pattern being displaced relative to the other so that the longitudinal parts of the respective waveforms are staggered so that the base can be rolled in such a way as to cause the patterns to form the equivalent of two diametrically opposed scanning coils wherein the transverse parts become parallel to the coil axisand the longitudinal parts extend circumferentially of the coils.

2. A circuit element according to claim 1 in which said patterns are adherent respectively on two surfaces of flexible insulating sheet material forming said base.

3. A circuit element according to claim 2 in which said patterns are adherent on the outer surfaces of a flexible insulating sheet.

4. A circuit element according to claim 1 in which each pattern includes a plurality of side-by-side conductors each of which conforms to the respective longitudinal waveform.

5. A circuit element according toclaim 1 in which the patterns are electrically connected together to form a single series circuit, so that the current in each transverse part of one waveform flows in the same direction as a current in the nearest transverse part of the other Waveform.

6. A circuit element according to claim 1 in which said patterns are such that successive cycles of each waveform subtend the same angle at the axis of the coil surface.

7. A coil comprising a flexible base which is rolled and which supports two overlapping and mutually insulated electrically conductive patterns each pattern comprising a repetitive circumferentially continuous waveform including circumferential parts and alternate parts transverse thereto meeting each other at right angles, one pattern being displaced relative to the other so that the circumferential parts of the respective waveforms are staggered so that the coil as rolled is equivalent to two diametrically opposed scanning coils wherein the parts transverse to the circumferential parts extend parallel to and longitudinally of the coil surface.

8. A coil comprising a flexible base which is rolled and which supports two overlapping and mutually insulated electrically conductive patterns each pattern comprising a repetitive circumferentially continuous rectangular waveform including circumferential parts and alternate parts transverse thereto meeting each other at right angles, one pattern being displaced relative to the other so that the circumferential parts of the respective waveforms are staggered so that the coil as rolled is equivalent to two diametrically opposed scanning coils wherein the parts transverse to the circumferential parts extend parallel to and longitudinally of the coil surface.

9. A circuit element comprising:

(a) a thin, flexible, elongated insulating member supporting mutually insulated overlapping conductive patterns on two surface areas,

(b) each pattern comprising a plurality of side-by-side conductors each conforming to a substantially rectangular waveform consisting of alternate longitudinal parts and transverse parts at right angels to each other,

(c) the longitudinal parts of the rectangular waveform on one surface area being staggered with respect to the longitudinal parts of the rectangular waveform on the other surface area,

((1) means-connecting the ends of said conductors successively one to another to connect said conductors in a single series circuit, so that the current in the transverse parts of the plurality of conductors on one surface area flows in the same direction as the current in the nearest transverse parts of the conductors on the other surface area.

10. A circuit element according to claim 9 in which said flexible insulating member is rolled to conform to a cylindrical surface wherein the transverse parts become parallel to the axis of such cylindrical surface and the longitudinal parts extend circumferentially of such cylindrical surface and said cylindrical surface being of such diameter that alternate transverse parts of the conductors on each surface area of the member are substantially diametrically opposite,

References Cited UNITED STATES PATENTS 2,831,136 4/1958 Hanlet 335299 XR 3,011,247 12/1961 Hanlet 336--200 XR 3,080,541 3/1963 Parker 336200 BERNARD A. GILHEANY, Primary Examiner US. Cl. X.R.

Citas de patentes
Patente citada Fecha de presentación Fecha de publicación Solicitante Título
US2831136 *29 Jun 195415 Abr 1958Visseaux S A JElectromagnetic deflecting means
US3011247 *6 Ene 19555 Dic 1961Visseaux S A JMethod of manufacturing printed electrical windings
US3080541 *9 Jul 19555 Mar 1963 parker
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US3701959 *24 Mar 197131 Oct 1972Varian AssociatesMicrowave cavity resonator with printed circuit interior walls and modulation coils
US3702450 *11 May 19717 Nov 1972Atomic Energy CommissionPrinted circuit steering coils
US3736543 *31 Mar 197229 May 1973Bendix CorpPhotoetched induction coil assembly
US3772587 *15 Mar 197213 Nov 1973Inductosyn CorpPosition measuring transformer
US4540918 *24 Ago 198210 Sep 1985Tokyo Shibaura Denki Kabushiki KaishaCoil device for image pickup tube
US5245307 *26 Oct 199214 Sep 1993Institut Dr. Friedrich Forster Pruferatebau Gmbh & Co. KgSearch coil assembly for electrically conductive object detection
US5436536 *18 Nov 199425 Jul 1995U.S. Philips CorporationDisplay tube including a convergence correction device
US5477204 *5 Jul 199419 Dic 1995Motorola, Inc.Radio frequency transformer
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US7210223 *13 Dic 20001 May 2007Image-Guided Neurologics, Inc.Method of manufacturing a microcoil construction
US7746208 *8 Dic 200629 Jun 2010Koninklijke Philips Electronics N.V.Interleaved planar transformer primary and secondary winding
US777404313 Abr 200710 Ago 2010Medtronic, Inc.Microcoil construction
US778645022 Sep 200831 Ago 2010Ceos Corrected Electron Optical Systems GmbhMultipole coils
US7986063 *26 May 200626 Jul 2011Namiki Seimitsu Houseki Kabushiki KaishaCylindrical coil and cylindrical micromotor using the same
US814623929 Jun 20103 Abr 2012Medtronic, Inc.Method of forming microcoil with conducting trace and attaching trace
DE102007045874A1 *25 Sep 20072 Abr 2009Ceos Corrected Electron Optical Systems GmbhMultipolspulen
DE102011106940A18 Jul 20119 Feb 2012Robert Bosch GmbhPosition measuring unit for measuring position of measuring scale i.e. broad strip, and sampling unit, has pairs of receiver coils switched in series manner, where distance between pairs of coils is integral multiple of pitch distance
DE102011106941A18 Jul 20119 Feb 2012Robert Bosch GmbhMeasuring unit for measuring position of e.g. receiver coil, has receiver coil groups with receiver coils that are switched with output voltages in series in measuring direction, where distance of receiver coils amounts to specific equation
EP2043130A211 Sep 20081 Abr 2009Ceos Corrected Electron Optical Systems GmbHMultipole coils
Clasificaciones
Clasificación de EE.UU.335/213, 336/200
Clasificación internacionalH01J29/76
Clasificación cooperativaH01J29/768
Clasificación europeaH01J29/76G