GB643280A - Improvements in cathode-ray tubes for television - Google Patents

Improvements in cathode-ray tubes for television

Info

Publication number
GB643280A
GB643280A GB1291/47A GB129147A GB643280A GB 643280 A GB643280 A GB 643280A GB 1291/47 A GB1291/47 A GB 1291/47A GB 129147 A GB129147 A GB 129147A GB 643280 A GB643280 A GB 643280A
Authority
GB
United Kingdom
Prior art keywords
cathode
tube
field
horizontal scanning
magnetic field
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
GB1291/47A
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.)
Space Systems Loral LLC
Original Assignee
Philco Ford Corp
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 Philco Ford Corp filed Critical Philco Ford Corp
Publication of GB643280A publication Critical patent/GB643280A/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
    • H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses

Landscapes

  • Details Of Television Scanning (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

643,280. Cathode-ray tubes. PHILCO CORPORATION. Jan. 14, 1947, No. 1291. Convention date, March 26, 1946. [Class 39 (i)] In a cathode-ray tube, for television reception or transmission, keystone distortion is corrected or produced by two separate and distinct constant magnetic fields extending across the tube in parallel opposite directions and passing through the tube axis. The arrangement is designed to eliminate the distortion in the form of bowing of the horizontal scanning lines which occurred in previous arrangements for correcting keystone distortion by establishing a single magnetic field through a cathode-ray tube. In the tube 11, Fig. 1, a strong uniform constant magnetic field 25 is established adjacent the fluorescent screen 16, the lines of force being parallel to the horizontal scanning direction, and a weaker non-uniform constant magnetic field 26 of opposite polarity is established between the first field 25 and the deflecting system 21. The fields, acting together, produce centrally on the screen 16 a keystone raster of straight horizontal scanning lines, the amount of keystoning depending on the amount in strength by which field 25 exceeds field 26. The fields are produced by two bar magnets 37, 38, Fig. 3A, inclined to the tube axis and having wide arcuate polepieces 35 and 36, respectively. Electromagnets may be used.
GB1291/47A 1946-03-26 1947-01-14 Improvements in cathode-ray tubes for television Expired GB643280A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US657175A US2459732A (en) 1946-03-26 1946-03-26 Electrical system

Publications (1)

Publication Number Publication Date
GB643280A true GB643280A (en) 1950-09-15

Family

ID=24636134

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1291/47A Expired GB643280A (en) 1946-03-26 1947-01-14 Improvements in cathode-ray tubes for television

Country Status (2)

Country Link
US (1) US2459732A (en)
GB (1) GB643280A (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2541446A (en) * 1949-01-04 1951-02-13 Barnet S Trott Image distortion corrector for cathode-ray tubes
US2999185A (en) * 1950-01-09 1961-09-05 Harry R Lubcke Television device
US2591159A (en) * 1950-05-29 1952-04-01 Gilfillan Bros Inc Magnetic means for producing compensations and other effects in a cathode-ray tube
US2675501A (en) * 1950-10-31 1954-04-13 Rca Corp Electron beam focusing system
US2574039A (en) * 1951-02-17 1951-11-06 All Star Products Inc Magnetic centering device for cathode ray tubes
US2861209A (en) * 1953-12-14 1958-11-18 Hazeltine Research Inc Cathode-ray-tube beam-deflection system
BE541271A (en) * 1954-09-14
US2972073A (en) * 1955-08-31 1961-02-14 Rca Corp Electron beam controlling apparatus
US2807740A (en) * 1955-10-14 1957-09-24 Hazeltine Research Inc Cathode-ray tube apparatus
US3115544A (en) * 1956-04-25 1963-12-24 Hazeltine Research Inc Color-television receivers and deflection yokes
US2921226A (en) * 1956-05-24 1960-01-12 Philco Corp Apparatus for color purity correction in color television receivers
US2879435A (en) * 1956-08-24 1959-03-24 Du Mont Allen B Lab Inc Cathode-ray tube
US3354337A (en) * 1966-02-28 1967-11-21 Zenith Radio Corp Convergence magnet pole shoes
US5023509A (en) * 1989-10-27 1991-06-11 Rca Licensing Corp. Color CRT-yoke combination having conforming corrective magnetic field means attached to the CRT
US6476545B1 (en) * 1999-04-30 2002-11-05 Sarnoff Corporation Asymmetric, gradient-potential, space-savings cathode ray tube
US6586870B1 (en) * 1999-04-30 2003-07-01 Sarnoff Corporation Space-saving cathode ray tube employing magnetically amplified deflection

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2177688A (en) * 1936-12-24 1939-10-31 Hazeltine Corp Cathode-ray tube scanning system
US2227711A (en) * 1937-02-20 1941-01-07 Firm Of Fernseh Ag Deflecting device for cathode ray tubes
NL59153C (en) * 1938-04-25
GB517597A (en) * 1938-08-08 1940-02-02 Baird Television Ltd Improvements in or relating to deflecting means for use with cathode ray tubes
DE972332C (en) * 1938-11-24 1959-07-02 Fernseh Gmbh Electromagnetic deflection device for cathode ray tubes, especially for televisions

Also Published As

Publication number Publication date
US2459732A (en) 1949-01-18

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