GB1467475A - Device for the deflection and convergence correction of electron beams - Google Patents

Device for the deflection and convergence correction of electron beams

Info

Publication number
GB1467475A
GB1467475A GB3053074A GB3053074A GB1467475A GB 1467475 A GB1467475 A GB 1467475A GB 3053074 A GB3053074 A GB 3053074A GB 3053074 A GB3053074 A GB 3053074A GB 1467475 A GB1467475 A GB 1467475A
Authority
GB
United Kingdom
Prior art keywords
coil
current
halves
field
convergence correction
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
Application number
GB3053074A
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.)
Videon SA
Original Assignee
Videon SA
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 FR7325910A external-priority patent/FR2246056B1/fr
Priority claimed from FR7329525A external-priority patent/FR2241137B2/fr
Application filed by Videon SA filed Critical Videon SA
Publication of GB1467475A publication Critical patent/GB1467475A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • H01J29/702—Convergence correction arrangements therefor
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/56—Correction of beam optics
    • H01J2229/568—Correction of beam optics using supplementary correction devices
    • H01J2229/5681—Correction of beam optics using supplementary correction devices magnetic
    • H01J2229/5687—Auxiliary coils

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

1467475 Electron beam magnetic deflecting apparatus VIDEON SA 10 July 1974 [13 July 1973 13 Aug 1973] 30530/74 Heading H1D [Also in Division H4] A device for the deflection and convergence correction of coplanar electron beams in colour TV tubes comprises two pairs of coil windings on a single ferrite core for deflection in two orthogonal directions 0/90 degrees, and four toroidal coils on said or another single ferrite core when the coil windings are toroidal, or an another single core when the coil windings are saddle shaped, and connected in series for dynamic convergence correction and which produce a four-pole field at 45 degrees to the 0/90 degree axes, the field being rotatable by varying the current distribution through the coils, the toroidal coils for convergence correction being each divided into two halves 1, 2, 3, 4 and 1<SP>1</SP>, 2<SP>1</SP>, 3<SP>1</SP>, 4<SP>1</SP>, and located on the core so that the centres of each two diametrically opposite coil halves form an angle Œα with the 0/90 degree axes and so that one set of coil halves are connected in series and the other halves are in series, both sets being connected in parallel with a correction current source, the current of which is supplied via a current distributing member to the parallel connected sets of coil halves. Ends 8, 9 are connected to a coil 10 about a displaceable ferrite core 12 whereby the currents to the different winding groups may be varied. Generator 6 produces a variable current displacing the beams horizontally and on variation of the almost symmetrical supply in centre tap 11 an angular variation ## of the field occurs. The four-pole field may be considered the superposition of a 45/45 degree field (αcos- (##)), and a 0/90 degrees four pole field (αsin- (##)). Control of the current for oppositely influencing the two outer beams (R, B) is independent of the current distribution control for influencing the rotation of the beams out of the horizontal. The current distribution control may alternatively be as in Fig. 3 (not shown) with potentiometer (13) in place of coil 10, or a group of semi-conductor elements of controllable resistance may be used.
GB3053074A 1973-07-13 1974-07-10 Device for the deflection and convergence correction of electron beams Expired GB1467475A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7325910A FR2246056B1 (en) 1973-07-13 1973-07-13
FR7329525A FR2241137B2 (en) 1973-08-13 1973-08-13

Publications (1)

Publication Number Publication Date
GB1467475A true GB1467475A (en) 1977-03-16

Family

ID=26217836

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3053074A Expired GB1467475A (en) 1973-07-13 1974-07-10 Device for the deflection and convergence correction of electron beams

Country Status (1)

Country Link
GB (1) GB1467475A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0042020A1 (en) * 1980-06-13 1981-12-23 International Business Machines Corporation Convergence unit for cathode-ray tube
GB2235575A (en) * 1989-07-31 1991-03-06 Matsushita Electronics Corp A deflection yoke for a cathode ray tube
US5179319A (en) * 1989-07-31 1993-01-12 Matsushita Electronics Corporation Deflection yoke for a color CRT

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0042020A1 (en) * 1980-06-13 1981-12-23 International Business Machines Corporation Convergence unit for cathode-ray tube
GB2235575A (en) * 1989-07-31 1991-03-06 Matsushita Electronics Corp A deflection yoke for a cathode ray tube
US5179319A (en) * 1989-07-31 1993-01-12 Matsushita Electronics Corporation Deflection yoke for a color CRT
GB2235575B (en) * 1989-07-31 1994-05-11 Matsushita Electronics Corp A deflection yoke for a cathode ray tube

Also Published As

Publication number Publication date
DE2432134A1 (en) 1975-01-30
DE2432134B2 (en) 1976-02-26

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee