GB412092A - Improvements in or relating to television apparatus - Google Patents

Improvements in or relating to television apparatus

Info

Publication number
GB412092A
GB412092A GB30081/33A GB3008133A GB412092A GB 412092 A GB412092 A GB 412092A GB 30081/33 A GB30081/33 A GB 30081/33A GB 3008133 A GB3008133 A GB 3008133A GB 412092 A GB412092 A GB 412092A
Authority
GB
United Kingdom
Prior art keywords
screen
ray
axis
oct
scan
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
GB30081/33A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co 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
Application filed by Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB412092A publication Critical patent/GB412092A/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
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only

Landscapes

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

Abstract

412,092. Cathode-ray tubes. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Electra House, Victoria Embankment, London.-(Assignees of Campbell, R. L. ; 56, Ridgeway Avenue, Oaklyn, New Jersey, U.S.A.) Oct. 30, 1933, No. 30081. Convention date, Oct. 29, 1932. [Class 39 (i).] A television system has a cathode-ray tube 10 with a screen 12 inclined to the axis of electron gun 20 and with deflecting fields for causing the ray to scan the screen, an additional constant magnetic field being superposed on the ray during the scanning action to cause it to scan a keystone-shaped area in a plane at right-angles to the axis 22 of the gun 20 and so a rectangular area on the inclined screen 12. The scanning fields are produced by currents of saw-tooth wave-form in coils 28, 32 on pole-pieces of a magnetic core 30 surrounding the tube 10 and the constant magnetic field is produced by a U-shaped permanent or electromagnet 34 with its poles 36, 38 beyond the core 30 and on opposite sides of a vertical plane through the axis 22. Distortions near the corners of the scanned area are corrected by magnets 44. In a television transmitter, an image to be transmitted is projected in a normal direction on to the screen 12 which is composed of minute, insulated, photo-sensitized silver globules receiving a charge according to the brightness of the corresponding point of the image.
GB30081/33A 1932-10-29 1933-10-30 Improvements in or relating to television apparatus Expired GB412092A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US640169A US1995376A (en) 1932-10-29 1932-10-29 Television system

Publications (1)

Publication Number Publication Date
GB412092A true GB412092A (en) 1934-06-21

Family

ID=24567114

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30081/33A Expired GB412092A (en) 1932-10-29 1933-10-30 Improvements in or relating to television apparatus

Country Status (3)

Country Link
US (1) US1995376A (en)
FR (1) FR762416A (en)
GB (1) GB412092A (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563525A (en) * 1951-08-07 Image size control device for
GB443952A (en) * 1934-07-04 1936-03-04 Michael Bowman Manifold Improvements in and relating to electrical circuits for the deflection of cathode ray beams
USB385358I5 (en) * 1935-10-31
NL67155C (en) * 1946-03-02
US2498354A (en) * 1946-12-03 1950-02-21 Philco Corp Magnetic lens system
FR944238A (en) * 1947-03-13 1949-03-30 Csf Electronic optics correction method
US2513221A (en) * 1948-07-01 1950-06-27 Rca Corp Register correction for television
US2534557A (en) * 1949-01-19 1950-12-19 Tele Tone Radio Corp Keystoning circuit
US2568456A (en) * 1949-12-06 1951-09-18 Gen Electric Electromagnetic deflection yoke structure
BE515724A (en) * 1951-11-24
BE529660A (en) * 1953-09-24

Also Published As

Publication number Publication date
FR762416A (en) 1934-04-11
US1995376A (en) 1935-03-26

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