US3854108A - Apparatus for compensation of right and left pincushion distortion - Google Patents

Apparatus for compensation of right and left pincushion distortion Download PDF

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Publication number
US3854108A
US3854108A US00435588A US43558874A US3854108A US 3854108 A US3854108 A US 3854108A US 00435588 A US00435588 A US 00435588A US 43558874 A US43558874 A US 43558874A US 3854108 A US3854108 A US 3854108A
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United States
Prior art keywords
magnetic core
half portions
pair
left half
windings
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Expired - Lifetime
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US00435588A
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English (en)
Inventor
E Horie
M Kikuchi
S Hatori
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Taiyo Yuden Co Ltd
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Taiyo Yuden Co Ltd
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Filing date
Publication date
Priority claimed from JP920173A external-priority patent/JPS5422853B2/ja
Priority claimed from JP2467073A external-priority patent/JPS5422854B2/ja
Application filed by Taiyo Yuden Co Ltd filed Critical Taiyo Yuden Co Ltd
Application granted granted Critical
Publication of US3854108A publication Critical patent/US3854108A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
    • H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
    • H04N3/237—Distortion correction, e.g. for pincushion distortion correction, S-correction using passive elements, e.g. diodes

Definitions

  • ABSTRACT Apparatus for compensation of right and left pincushion distortion comprising a closed magnetic circuit having a saturable magnetic core with right and left half portions symmetrical to one another and a branched portion defining an air gap and symmetrically arranged with respect to the right and left half portions.
  • the branched portion can be centrally lo- [30] Forelgn Apphcauon Pnomy Data cated in the core or can be disposed at opposite ends Jan.
  • a pair of first and second windings are wound 1, 1973 Japan 48-24670 on each of the right and left half portions, the first windings of both pairs being connected in series so as [52] US. Cl. 335/210, 315/27 SR to have the ame winding directions in relation to the [51] Int. Cl. 01f 7/00 saturable magnetic core and being adopted for being [58] Field of Search 335/2 connected to a vertical deflection circuit, whereas the 315/27 SR second windings of both pairs are connected in series so as to have reverse winding directions in relation to References Cited the saturable magnetic core and are adapted for being UNITED STATES PATENTS connected to a horizontal deflection circuit.
  • SHEEPMF 3 APPARATUS FOR COMPENSATION OF RIGHT AND LEFT PINCUSI-IION DISTORTION BACKGROUND
  • This invention relates to apparatus for the compensation of right and left pincushion distortion in a color television set.
  • the raster in a color television set becomes larger in right and left pincushion distortion as the deflection angle of a Braun tube is increased.
  • the transformer including an E I type saturable magnetic core has been used in such a manner that a horizontal deflection current is amplitude-modulated into a parabolic wave form so that the horizontal deflection current is maximum in amplitude at the middle of each vertical scanning period. Namely, as shown in FIG.
  • an E type magnetic core 1 and an I type magnetic core 2 are joined together to form a composite magnetic core of E I type, whose center leg portion 3 thereof is provided with a winding or coil 4, and whose opposite side leg portions 5a, 5b are provided with respective windings or coils 6a, 6b, the coils 6a, 6b being connected in series at a point 7.
  • Opposite terminals 8a, 8b of the series connected coils 6a, 6b are connected in series to a horizontal deflection coil (not illustrated) in an image receiving set and when a horizontal deflection current flows through the coils 6a, 6b, magnetic fluxes arising from the deflection current are generated as shown by the solidline arrows 9a, 9b, and these fluxes 9a, 9b are reversed in direction at the center leg portion 3' and hence oppose one another so that a net voltage (horizontal deflection voltage) based on these fluxes is not induced in the coil 4.
  • an electric current of a parabolic wave form having a vertical deflection frequency is passed, while superposed on a direct electric current, between the terminals of the coil 4, this current produces fluxes 10a, 10b as shown in dotted lines which serves as a control current for changing the degree of magnetic saturation at the center leg portion 3' and at the opposite side leg portions 5a, 5b.
  • the inductance of the coils 6a, 6b viewed from the terminals 8a, 8b is modulated and thereby the electric current flowing through the horizontal deflection coil is amplitude-modulated into a parabolic wave form with the frequency of vertical deflection.
  • An object of the present invention is to provide pincushion distortion compensation apparatus to overcome the foregoing deficiencies and in which apparatus the magnetic core is prevented from being saturated with the electric current of the horizontal deflection current coils while completely compensating right and left pincushion distortions.
  • the horizontal deflection current coils 6a, 6b are connected so as to be reverse in winding directions.
  • the magnetic fluxes 9a, 9b in FIG. 1 have the same directions at the center leg portion 3 and are additive thereat whereby a saturation phenomenon is rapidly produced at that portion so that the control current does not operate effectively.
  • the center leg portion 3' of the magnetic core is entirely removed and the coil 4 provided near the coils 6a, 6! on the opposite side leg portions. In this case, however, the magnetic fluxes 9a, 9b of the coils 6a, 6b entirely negate one another and the coils 6a, 6b become useless.
  • the invention is predicated on the concept that it can be considered that, concerning the center leg portion 3 of the conventional apparatus wherein the winding directions of the coils 6a, 6b are reversed, a desirable condition could be obtained between the exsistence and the nonexsistence of the same.
  • FIG. 1 is a side elevation view of a conventional apparatus for compensation of pincushion distortion
  • FIGS. 2 and 3 are diagrammatic illustrations showing characteristic features thereof
  • FIG. 4 is a side elevation view of one embodiment of apparatus for compensation of pincushion distortion according to the invention.
  • FIG. 5 is a graphical diagram showing a characteristic feature of the same
  • FIG. 6 is a graphical diagram showing a comparison between characteristic features of the conventional apparatus and that of the invention.
  • FIG. 7 is a side elevation view of a modified embodiment according to the invention.
  • FIG. 8 is a top plan view thereof
  • FIG. 9 is a side sectional view, taken along the line IX-IX in FIG. 10, of another modified embodiment according to the invention.
  • FIG. 10 is a top plan view thereof.
  • numeral 1 denotes a saturable magnetic core of a closed magnetic circuit comprising a circular ring composed of right and left semi-circular portions la, lb symmetrical in form with respect to one another and numeral 2 denotes a diverged or branched magnetic core extending in the middle portion of the magnetic core 1 to define an air gap 3 between the magnetic core 1 and the deverged core 2 so as to increase the magnetic resistance of the diverged magnetic core 2.
  • the right and left half portions 1a, lb are provided, respectively, with a pair of first windings or coils 4a, 4b and a pair of second windings or coils 5a, 5b wound thereon.
  • the first windings 4a, 4b are connected in series at a point 6 so as to be the same in winding direc-' tions in relation to the saturable magnetic core 1, and numerals 7a, 7b denote the opposite terminals thereof.
  • the second windings 5a, 5b are connected in series at a point 8 so as to be reverse in their winding directions, and numerals 9a, 9b denote the opposite terminals thereof.
  • the terminals 7a, 7b are connected to a vertical deflection circuit (not shown), and the terminals 9a, 9b are connected to a horizontal deflection circuit (not shown).
  • the magnetic fluxes induced in the coils 4a, 4b by the horizontal deflection current flowing through the coils 5a, 5b are made to be reverse in direction, so that no horizontal deflection voltage component is generated in the coils 4a, 4b.
  • the vertical deflection current is small in value, the magnetic fluxes generated from the coils 4a, 4b are small and the magnetic core 1 is never magnetically saturated.
  • the inductance of the coils 5a, 5b can be modulated as in the conventional apparatus.
  • FIGS. 7 and 8 show a modified embodiment of this invention.
  • a saturable magnetic core 101 of closed magnetic circuit type comprises right and left half portions 101a, 10lb which are provided at their right and left outside portions with respective branched or diverged magnetic cores 102 having respective air gaps 103.
  • the composite magnetic core is composed of a pair of right and left hand drum type cores G, each having upper and lower circular flanges g with connecting stems, the cores being suitably cut at their flanges to form flat faces at which they are joined together to form the composite magnetic core with the saturable magnetic core 101 and the right and left symmetrical diverged magnetic cores 102, having the air gaps 103.
  • this embodiment is not significantly different from the previously described embodiment.
  • FIGS. 9 and 10 show another embodiment of the invention in which the saturable magnetic core 201 with right and left portions 201a, 201b is provided at its right and left outside portions with respective branch or diverged magnetic cores 202 having respective air gaps 203.
  • the composite magnetic core is constituted by a pair of upper and lower pot type cores H, joined together through a pair of right and left stems h
  • the composite magnetic core is constituted by a pair of upper and lower pot type cores H, joined together through a pair of right and left stems h
  • Apparatus for compensation of right and left pincushion distortions comprising a closed magnetic circuit including a saturable magnetic core having right and left half portions symmetrical to one another and a branch portion defining an air gap and symmetrically arranged with respect to said right and left half portions, a pair of first and second windings on each of the right and left half portions, the first windings of both pairs being connected in series so as to have the same winding directions in relation to the saturable magnetic core and being adapted for being connected to a vertical deflection circuit, the second windings of both pairs being connected in series so as to have reverse winding directions in relation to the saturable magnetic core and being adapted for being connected to a horizontal deflection circuit.
  • said saturable magnetic core is in the form of a circular ring, said branched portion extending along a diameter thereof.
  • said magnetic core is constituted by a pair of right and left hand drum elements, each having a pair of upper and lower circular flanges and a connecting stern, each of the flanges of the drum elements being partly cut to form flat faces at which the drum elements are joined together.
  • said magnetic core is constituted by a pair of upper and lower pot type core elements with respective stems, said core elements being joined together through a pair of right and left stems.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
US00435588A 1973-01-23 1974-01-22 Apparatus for compensation of right and left pincushion distortion Expired - Lifetime US3854108A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP920173A JPS5422853B2 (nl) 1973-01-23 1973-01-23
JP2467073A JPS5422854B2 (nl) 1973-03-01 1973-03-01

Publications (1)

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US3854108A true US3854108A (en) 1974-12-10

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US00435588A Expired - Lifetime US3854108A (en) 1973-01-23 1974-01-22 Apparatus for compensation of right and left pincushion distortion

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US (1) US3854108A (nl)
DE (1) DE2403217B2 (nl)
GB (1) GB1455313A (nl)
NL (1) NL162533C (nl)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020390A (en) * 1975-09-29 1977-04-26 Gte Sylvania Incorporated Side pin-cushion distortion correction circuit
US4042801A (en) * 1974-08-31 1977-08-16 British Aircraft Corporation Limited Electron beam apparatus
US4151497A (en) * 1976-04-05 1979-04-24 Gte Sylvania Incorporated Arc-resistant deflection yoke
US4283663A (en) * 1978-01-20 1981-08-11 Victor Company Of Japan, Ltd. Horizontal deflection circuit in a television device
FR2507817A1 (fr) * 1981-06-14 1982-12-17 Victor Company Of Japan Dispositif de correction d'une image sur un cathoscope comportant des canons a electrons en ligne et un ensemble de bobine pour ce dispositif
US4445101A (en) * 1981-07-21 1984-04-24 Victor Company Of Japan, Limited Deflecting yoke assembly for making a trapezoidal raster
US6013989A (en) * 1996-05-20 2000-01-11 Samsung Electronics Co., Ltd. Wide-band horizontal linearity correction circuit
US20090195345A1 (en) * 2005-05-25 2009-08-06 Sumida Corporation Magnetic element

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3325675A (en) * 1964-08-05 1967-06-13 Paramount Pictures Corp Three in-line gun magnetic convergence system
US3781590A (en) * 1972-06-12 1973-12-25 Warwick Electronics Inc Pincushion distortion correction circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3325675A (en) * 1964-08-05 1967-06-13 Paramount Pictures Corp Three in-line gun magnetic convergence system
US3781590A (en) * 1972-06-12 1973-12-25 Warwick Electronics Inc Pincushion distortion correction circuit

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042801A (en) * 1974-08-31 1977-08-16 British Aircraft Corporation Limited Electron beam apparatus
US4020390A (en) * 1975-09-29 1977-04-26 Gte Sylvania Incorporated Side pin-cushion distortion correction circuit
US4151497A (en) * 1976-04-05 1979-04-24 Gte Sylvania Incorporated Arc-resistant deflection yoke
US4283663A (en) * 1978-01-20 1981-08-11 Victor Company Of Japan, Ltd. Horizontal deflection circuit in a television device
FR2507817A1 (fr) * 1981-06-14 1982-12-17 Victor Company Of Japan Dispositif de correction d'une image sur un cathoscope comportant des canons a electrons en ligne et un ensemble de bobine pour ce dispositif
US4554488A (en) * 1981-06-14 1985-11-19 Victor Company Of Japan, Limited Device for correcting an image on a picture tube having in-line electron guns and a coil assembly for the device
US4588930A (en) * 1981-06-14 1986-05-13 Victor Company Of Japan, Limited Device for correcting an image on a picture tube having in-line electron guns and a coil assembly for the device
US4445101A (en) * 1981-07-21 1984-04-24 Victor Company Of Japan, Limited Deflecting yoke assembly for making a trapezoidal raster
US6013989A (en) * 1996-05-20 2000-01-11 Samsung Electronics Co., Ltd. Wide-band horizontal linearity correction circuit
US20090195345A1 (en) * 2005-05-25 2009-08-06 Sumida Corporation Magnetic element
US7893807B2 (en) * 2005-05-25 2011-02-22 Sumida Corporation Magnetic element

Also Published As

Publication number Publication date
NL7400785A (nl) 1974-07-25
NL162533B (nl) 1979-12-17
DE2403217A1 (de) 1974-07-25
DE2403217B2 (de) 1976-05-20
GB1455313A (en) 1976-11-10
NL162533C (nl) 1983-09-16

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