US3587019A - Scanning coils - Google Patents

Scanning coils Download PDF

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Publication number
US3587019A
US3587019A US766015*A US3587019DA US3587019A US 3587019 A US3587019 A US 3587019A US 3587019D A US3587019D A US 3587019DA US 3587019 A US3587019 A US 3587019A
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US
United States
Prior art keywords
conductors
parts
transverse
coils
longitudinal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US766015*A
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English (en)
Inventor
Eric William Bull
Alfred Marcos Sampeys
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB32578/65A external-priority patent/GB1157805A/en
Application filed by EMI Ltd filed Critical EMI Ltd
Application granted granted Critical
Publication of US3587019A publication Critical patent/US3587019A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only
    • H01J29/768—Deflecting by magnetic fields only using printed windings

Definitions

  • ABSTRACT A circuit element, which is intended to be rolled into a cylindrical or like form to constitute a scanning coil assembly for a cathode-ray tube, is formed of a tapelike, flexible substrate with conductive patterns on either side thereof. Each pattern comprises a plurality of side by side conductors conforming to a longitudinally extending, substantially rectangular waveform, formed of alternate longitudinal and transverse portions. The longitudinal portions of the two waveforms are staggered with respect to each other, and respective conductors in the transverse portions are offset with respect to one another in the longitudinal direction so as to tend to reduce the self-capacitance of the element when wound to form a scanning coil assembly.
  • This invention relates to scanning coils for cathode-ray tubes and in particular to printed circuit scanning coils.
  • the twoconductive patterns are provided initially on the same side of a thin insulating flexible base.
  • the patterns formed say by copper adhering to the base, can be produced by a process such as may be used for forming printed circuits.
  • the thin flexible base is then cut along its longitudinal centerline, except when there are conductors joining the two conductive patterns, the two halves are folded so that the one pattern lies on top of the other, and the base is then rolled.
  • a thin sheet of flexible insulating material is inserted to ensure that the two patterns do not contact in the finished coil. In the finished coil the conductors in adjacent layers of the roll lie very close together and it is found that this may'produce appreciable capacitance.
  • a printed circuit scanning coil arrangement comprises a flexible base which supports two overlapping and mutually insulated electrically conductive patterns, interconnected to form a series circuit, each pattern comprising a plurality of side by side conductors conforming to a repetitive, longitudinally extending rectangular waveform consisting of alternate longitudinal and transverse parts at right angles to one another, one pattern being displaced relative to the other so that the longitudinal parts of the respective waveforms are staggered, the base being rolled in a plurality of turns about an axis parallel to said transverse conductor parts, to form scanning coils in which the transverse parts of the conductors are disposed in two diametrically opposite groups, the improvement lying in that the transverse parts of the conductors of the two patterns are relatively displaced in the longitudinal direction to offset the respective parts of the conductors in adjacent turns, thereby to reduce the capacitance of the coils.
  • the spaces between the conductors are substantially equal to the widths of the respective conductors and the conductors are arranged so that when the base is rolled the conductors in one layer are superimposed on the spaces between the conductors on the next adjacent layer.
  • FIG. 1 illustrates diagrammatically a simplified form of a circuit element used in forming a scanning coil according to one example of the present invention
  • FIG. 2 is a perspective view of the finished coil mounted on a cathode-ray tube
  • FIG. 3 illustrates a fragment of a circuit element used in one practical form of the invention
  • FIG. 4 is a diagrammatic representation of the scanning coil utilizing the circuit element of which a fragment is illustrated in FIG. 3, showing the relative position of theconductors, and FIG. 5 shows, on an enlarged scale, a portion of the right-hand end of FIG. I, and an alternative configuration for the conductors.
  • the circuit element shown in FIG. I comprises a thin flexible base 1 formed of insulating material such as Mylar.
  • Two conductive patterns 2 and 3 are formed on the same surface of the base I, each pattern comprising a repetitive longitudinally extending rectangular waveform. For the sake of simplicity only four'conductors are shown in each pattern and each pattern includes only four cycles of the rectangular waveform, although in practice, a larger number of conductors and cycles may be required.
  • Two terminals 4 and 5 are formed at one end of the base 1 and the conductors are connected successively one to the other by connecting conductors 6 and 7 to form a single series circuit from the terminal 4 to the terminal 5.
  • the material of the conductors forming the patterns hand 3 is copper adhering to the base 1.
  • Thepatterns are formed by starting with a base I which is uniformly coated with a thin copper layer and by etching away unwanted copper as is done in thepreparation of printed circuit boards. I
  • the base is cut along the centerline 8, except where the connecting conductors 6 and 7 are provided, andfoided so that the pattern 3 is superimposed on the pattern 2, the patterns being on what are now the two outer surfaces of the base.
  • the longitudinal parts such as 9 and I0 of the patterns are now staggered but the transverse parts are superimposed.
  • the base is'rolled to form a cylinder, the diameter of which is such that the transverse parts of the patterns form two diametrically opposite groups.
  • the pitch of the patterns 2 and 3 must increase progressively in proportion to the winding radius.
  • registration strips of copper II, 12, I3 and 14 are printed on the base alongside the active conductors of the patterns 2 and 3, the strips containing small holes spaced at what will be equiangular intervals when the base is rolled.
  • a jig with radial pins engages the holes in the copper strips and ensures that there is no cumulative error in position.
  • the two patterns 2 and 3 are also formed to slightly different scales to allow for the fact that they will lie at different radii of the roll.
  • a thin sheet of insulating material is inserted to prevent contact between the copper conductors.
  • the roll is impregnated with adhesive to form a self-supporting unitary coil structure, the registration strips 11 to 14 being eventually cut away leaving a finished coil such as represented in FIG. 2.
  • FIG. 2 shows the coil fitted to a cathode-ray tube in the form of a television pickup tube 15 having a photoconductive target.
  • line and frame coils may be printed on a single base, together with electrostatic screens which separate and enclose the coils.
  • the connecting conductors 6 and 7 are inclined to allow for the different scales of the two patterns 2 and 3.
  • the uncut connecting pieces of insulating material, to which adhere the connecting conductors 6 and 7 may be corrugated to prevent wrinkling as described in the specification of [3.5. Pat. No. 3,466,586.
  • the connecting pieces may also be strengthened with adhesive tape.
  • FIGS. 1 and 2 are generally similar to that described and claimed in the specification of US. Pat. No. 3,466,580.
  • the illustrated coil differs however in that the conductors forming the patterns 2 and 3, though shown as relatively thin in FIG. I are of substantially the same widths as the spaces between them.
  • FIG. 3 shows a fragment of the two patterns each consisting of nine conductors 2. to 2, andil, to 3,
  • the two patterns cor respond respectively to the patterns 2 and 3 of FIG. I but the pattern 3, comprising the conductors 3, to 3. is seen looking through the base I, after the base has been folded.
  • FIG. 3 shows that the transverse parts of the conductors of the pattern 2 are displaced from those of the pattern 3 in the longitudinal direction in such a way that the conductors of different layers are offset. The displacement is such that when the base has been rolled, the conductors 3, to 3, are superimposed on spaces between the conductors 2, to 2, on the next adjacent layer. This is represented diagrammatically in FIG. 4.
  • the relative displacement of the conductors 2 and 3 on the flat circuit element must differ slightly from half the distance between two adjacent conductors 2 (or two adjacent conductors 3) to allow for increasing radius. No relative displacement of the longitudinal parts of the conductors is required, since the longitudinal parts of the different patterns are not superimposed when the base 1 is rolled. ln'one practical coil, the use of the invention achieved a reduction of the self-capacity of the coil from around 1200 pf. to around 425 pf.
  • each conductor may be constituted by a number of thin parallel strands connected together at the terminals, as shown in FIG. 5, only four sets of conductors being shown in each of patterns 2 and 3 for simplicity.
  • Each set of conductors is formed of three parallel and closely spaced conductor portions, these portions being separate apart-from being interconnected at the terminals 4, 5.
  • FIG. 5 all features which arecommon to FIG. 1 are given the same reference numerals, and FIG. 5 represents, on an enference that sets of parallel conductor portions are employed instead of unitary conductor portions.
  • a printed circuit scanning coil arrangement comprising a flexible base which supports two overlapping and mutually insulated electrically conductive patterns, interconnected to form a series circuit, each pattern comprising a plurality of side-by-side conductors conforming to a repetitive, longitudinally extending rectangular waveform consisting of alternate longitudinal and transverse parts at right angles to one another, one pattern being displaced relative to the other so that the longitudinal parts of the' respective waveforms are staggered, the base being rolled in a plurality of turns about an axis parallel to said transverse conductorv parts, to form scanning coils in which the transverse parts of the conductors are disposed in two diametrically opposite groups, the improvement lying in that the transverse parts of the conductors of the two patterns are relatively displaced in the longitudinal direction to offset the respective parts of the conductors in adjacent turns, thereby to reduce the capacitance of the coils.
  • a printed circuit scanning coil arrangement according to claim 1 in which said relative displacement of the transverse parts of the conductors is such that the transverse conductor parts in one turn of the coils are superimposed on the spaces between the conductors on the next turn of the coils.
  • a printed circuit scanning coil arrangement according to claim I in which the width of the transverse parts of said conductors is substantially the same as the width of the spaces between the transverse parts of said conductors.

Landscapes

  • Coils Or Transformers For Communication (AREA)
  • Details Of Television Scanning (AREA)
  • Structure Of Printed Boards (AREA)
US766015*A 1965-07-30 1968-08-22 Scanning coils Expired - Lifetime US3587019A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB32578/65A GB1157805A (en) 1965-07-30 1965-07-30 Improvements in or relating to Circuit Elements especially for use as Scanning Coils
GB3894567 1967-08-24

Publications (1)

Publication Number Publication Date
US3587019A true US3587019A (en) 1971-06-22

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ID=10406661

Family Applications (1)

Application Number Title Priority Date Filing Date
US766015*A Expired - Lifetime US3587019A (en) 1965-07-30 1968-08-22 Scanning coils

Country Status (5)

Country Link
US (1) US3587019A (de)
DE (1) DE1764871B2 (de)
FR (1) FR95574E (de)
GB (1) GB1233546A (de)
NL (1) NL6811646A (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726004A (en) * 1970-02-20 1973-04-10 Marconi Co Ltd Method of making printed circuit magnetic field coils
US3736543A (en) * 1972-03-31 1973-05-29 Bendix Corp Photoetched induction coil assembly
US3769698A (en) * 1972-03-31 1973-11-06 Bendix Corp Method of manufacturing a photoetched induction coil
US3772587A (en) * 1972-03-15 1973-11-13 Inductosyn Corp Position measuring transformer
US3903437A (en) * 1973-04-03 1975-09-02 Keiichi Mori Linear motor winding and method of fabricating the same
US3924466A (en) * 1974-10-21 1975-12-09 Honeywell Inc Magnetic flowmeter with improved field coil
WO1986000182A1 (en) * 1981-08-17 1986-01-03 New Process Industries, Inc. Linear electromagnetic machine
US4590426A (en) * 1983-12-08 1986-05-20 Sperry Corporation Bzz and Byz sense loop geometries for cylindrical tensor gradiometer loop structures
US4962329A (en) * 1987-08-03 1990-10-09 Minebea Co., Ltd. Spirally layered and aligned printed-circuit armature coil
US5237245A (en) * 1990-05-21 1993-08-17 U.S. Philips Corporation Television pick-up tube and deflection system for use in such a television pick-up tube
US6144281A (en) * 1995-12-05 2000-11-07 Smiths Industries Aerospace & Defense Systems, Inc. Flexible lead electromagnetic coil assembly
US20080224561A1 (en) * 2006-09-04 2008-09-18 Seiko Epson Corporation Electric motor, method for manufacturing electric motor, electromagnetic coil for electric motor, electronic device, and fuel cell equipped apparatus
US20090002116A1 (en) * 2005-12-19 2009-01-01 Koninklijke Philips Electronics, N.V. Interleaved Planar Transformer Primary and Secondary Winding
EP2043130A2 (de) 2007-09-25 2009-04-01 Ceos Corrected Electron Optical Systems GmbH Multipolspulen
US20110057629A1 (en) * 2009-09-04 2011-03-10 Apple Inc. Harnessing power through electromagnetic induction utilizing printed coils
JP2011137748A (ja) * 2009-12-28 2011-07-14 Jtekt Corp 変位センサ装置及び転がり軸受装置
US10498183B2 (en) 2011-04-11 2019-12-03 Allied Motion Technologies Inc. Flexible winding for an electric motor and method of producing
US20230216361A1 (en) * 2020-02-07 2023-07-06 Systems, Machines, Automation Components Corporation Multi-layer printed coil arrangement having variable-pitch printed coils

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1248386B (de) * 1959-01-13 1967-08-24 Ehrenreich & Cie A Elastische Dichtungsmanschette oder -kappe fuer allseitig bewegliche Gelenke
GB2162364A (en) * 1984-07-27 1986-01-29 Philips Electronic Associated Saddle coils for electromagnetic deflection units
DE3713399A1 (de) * 1986-04-21 1987-10-22 Siemens Ag Ablenkspulenanordnung
DE3712460A1 (de) * 1987-04-11 1988-10-20 Trw Ehrenreich Gmbh Kugelgelenk

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3726004A (en) * 1970-02-20 1973-04-10 Marconi Co Ltd Method of making printed circuit magnetic field coils
US3772587A (en) * 1972-03-15 1973-11-13 Inductosyn Corp Position measuring transformer
US3736543A (en) * 1972-03-31 1973-05-29 Bendix Corp Photoetched induction coil assembly
US3769698A (en) * 1972-03-31 1973-11-06 Bendix Corp Method of manufacturing a photoetched induction coil
US3903437A (en) * 1973-04-03 1975-09-02 Keiichi Mori Linear motor winding and method of fabricating the same
US3924466A (en) * 1974-10-21 1975-12-09 Honeywell Inc Magnetic flowmeter with improved field coil
WO1986000182A1 (en) * 1981-08-17 1986-01-03 New Process Industries, Inc. Linear electromagnetic machine
US4590426A (en) * 1983-12-08 1986-05-20 Sperry Corporation Bzz and Byz sense loop geometries for cylindrical tensor gradiometer loop structures
US4962329A (en) * 1987-08-03 1990-10-09 Minebea Co., Ltd. Spirally layered and aligned printed-circuit armature coil
US5012571A (en) * 1987-08-03 1991-05-07 Minebea Co. Ltd. Method of manufacturing spirally layered and aligned printed-circuit armature coil
US5237245A (en) * 1990-05-21 1993-08-17 U.S. Philips Corporation Television pick-up tube and deflection system for use in such a television pick-up tube
US6144281A (en) * 1995-12-05 2000-11-07 Smiths Industries Aerospace & Defense Systems, Inc. Flexible lead electromagnetic coil assembly
US7746208B2 (en) * 2005-12-19 2010-06-29 Koninklijke Philips Electronics N.V. Interleaved planar transformer primary and secondary winding
US20090002116A1 (en) * 2005-12-19 2009-01-01 Koninklijke Philips Electronics, N.V. Interleaved Planar Transformer Primary and Secondary Winding
US20080224561A1 (en) * 2006-09-04 2008-09-18 Seiko Epson Corporation Electric motor, method for manufacturing electric motor, electromagnetic coil for electric motor, electronic device, and fuel cell equipped apparatus
US20090084975A1 (en) * 2007-09-25 2009-04-02 Ceos Corrected Electron Optical Systems Gmbh Multipole coils
DE102007045874A1 (de) * 2007-09-25 2009-04-02 Ceos Corrected Electron Optical Systems Gmbh Multipolspulen
EP2043130A2 (de) 2007-09-25 2009-04-01 Ceos Corrected Electron Optical Systems GmbH Multipolspulen
US7786450B2 (en) 2007-09-25 2010-08-31 Ceos Corrected Electron Optical Systems Gmbh Multipole coils
US20110057629A1 (en) * 2009-09-04 2011-03-10 Apple Inc. Harnessing power through electromagnetic induction utilizing printed coils
US8193781B2 (en) * 2009-09-04 2012-06-05 Apple Inc. Harnessing power through electromagnetic induction utilizing printed coils
US8362751B2 (en) 2009-09-04 2013-01-29 Apple Inc. Harnessing power through electromagnetic induction utilizing printed coils
JP2011137748A (ja) * 2009-12-28 2011-07-14 Jtekt Corp 変位センサ装置及び転がり軸受装置
US10498183B2 (en) 2011-04-11 2019-12-03 Allied Motion Technologies Inc. Flexible winding for an electric motor and method of producing
US20230216361A1 (en) * 2020-02-07 2023-07-06 Systems, Machines, Automation Components Corporation Multi-layer printed coil arrangement having variable-pitch printed coils

Also Published As

Publication number Publication date
FR95574E (fr) 1971-03-26
NL6811646A (de) 1969-02-26
GB1233546A (de) 1971-05-26
DE1764871B2 (de) 1972-12-14
DE1764871A1 (de) 1972-03-02

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