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GB670431A - Magnetic focussing device for cathode ray tubes - Google Patents

Magnetic focussing device for cathode ray tubes

Info

Publication number
GB670431A
GB670431A GB5062/49A GB506249A GB670431A GB 670431 A GB670431 A GB 670431A GB 5062/49 A GB5062/49 A GB 5062/49A GB 506249 A GB506249 A GB 506249A GB 670431 A GB670431 A GB 670431A
Authority
GB
United Kingdom
Prior art keywords
ring
teeth
gap
ray tubes
feb
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
GB5062/49A
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.)
Pye Electronic Products Ltd
Original Assignee
Pye 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 Pye Ltd filed Critical Pye Ltd
Priority to GB5062/49A priority Critical patent/GB670431A/en
Priority to US145869A priority patent/US2606301A/en
Publication of GB670431A publication Critical patent/GB670431A/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
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/64—Magnetic lenses

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Details Of Television Scanning (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

670,431. Cathode-ray tubes. COURT, P. R. J., and PYE, Ltd. Feb. 20, 1950 [Feb. 24, 1949], No. 5062/49. Class 39 (i). [Also in Group XXXV] A focusing device comprises spaced annular magnetic members, the flux in the gap therebetween being produced by magnetizing means and varied by the relative rotation of teeth which are directed towards each other and arranged about the two annular members and at the ends of the magnetizing means. An annular permanent magnet 1, or coil in which the current is not adjustable, is secured by screws 4 between flanged sheet-metal poles 2, 3 which define the focusing gap. The pole 2 and a ring 5, rotatable on the pole 3, are each provided with three teeth, the edges of which may be inclined, or rectangular, to define an adjustable gap which is smaller than the focusinggap.- Adjustment is effected by a lever 7, secured to a tooth on the ring 5 and operated. by an arm extending through the cabinet of the television receiver or by link mechanism or by a gear-wheel engaging teeth on the ring 5. The arrangement is supported from the cabinet by a ring 12, screws 11, and a frame 10 having an embossed part to permit rotation of the ring 5. A centring device comprising rotatable rings 21, 22, diametrically magnetized, and insulating rings may be provided as described in Specification 670,021. Specification 648,793 also is referred to.
GB5062/49A 1949-02-24 1949-02-24 Magnetic focussing device for cathode ray tubes Expired GB670431A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB5062/49A GB670431A (en) 1949-02-24 1949-02-24 Magnetic focussing device for cathode ray tubes
US145869A US2606301A (en) 1949-02-24 1950-02-23 Magnetic focusing device for cathode-ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5062/49A GB670431A (en) 1949-02-24 1949-02-24 Magnetic focussing device for cathode ray tubes

Publications (1)

Publication Number Publication Date
GB670431A true GB670431A (en) 1952-04-16

Family

ID=9789037

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5062/49A Expired GB670431A (en) 1949-02-24 1949-02-24 Magnetic focussing device for cathode ray tubes

Country Status (2)

Country Link
US (1) US2606301A (en)
GB (1) GB670431A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB731451A (en) * 1952-10-23 1955-06-08 Dennis Henry Covill Improvements in or relating to arrangements for use with cathode ray tubes
US2922909A (en) * 1955-08-31 1960-01-26 Westinghouse Electric Corp Beam centering apparatus
US2972074A (en) * 1959-10-14 1961-02-14 Philco Corp Magnetic beam-controlling means for cathode ray tubes

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB597255A (en) * 1945-07-09 1948-01-21 Cinema Television Ltd Improvements in or relating to mounts for magnetic deflecting or focusing means
GB494839A (en) * 1937-05-01 1938-11-01 British Thomson Houston Co Ltd Improvements in and relating to cathode ray apparatus
GB504802A (en) * 1937-11-01 1939-05-01 Frederick Hermes Nicoll Improvements in or relating to permanent magnet devices for producing axially symmetrical magnetic fields
US2336837A (en) * 1938-05-10 1943-12-14 A C Cosser Ltd Electrical apparatus
GB521439A (en) * 1938-11-18 1940-05-22 Kolster Brandes Ltd Focussing magnets for cathode ray tubes
US2234720A (en) * 1939-08-10 1941-03-11 Gen Electric Electron discharge apparatus
US2442975A (en) * 1943-08-31 1948-06-08 Rca Corp Focusing system
US2416687A (en) * 1944-03-30 1947-03-04 Bell Telephone Labor Inc Magnetic focussing device
US2418487A (en) * 1944-03-31 1947-04-08 Bell Telephone Labor Inc Cathode ray magnetic focusing device
BE470596A (en) * 1946-02-27

Also Published As

Publication number Publication date
US2606301A (en) 1952-08-05

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