GB1048452A - Improvements in or relating to magnetic deflecting means for cathode-ray tubes - Google Patents

Improvements in or relating to magnetic deflecting means for cathode-ray tubes

Info

Publication number
GB1048452A
GB1048452A GB4537/65A GB453765A GB1048452A GB 1048452 A GB1048452 A GB 1048452A GB 4537/65 A GB4537/65 A GB 4537/65A GB 453765 A GB453765 A GB 453765A GB 1048452 A GB1048452 A GB 1048452A
Authority
GB
United Kingdom
Prior art keywords
current
deflection
network
cathode
shunted
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
GB4537/65A
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.)
Thales Nederland BV
Original Assignee
Thales Nederland BV
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 Thales Nederland BV filed Critical Thales Nederland BV
Publication of GB1048452A publication Critical patent/GB1048452A/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
    • 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
    • H01J29/003—Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
    • H01J2229/0046—Preventing or cancelling fields within the enclosure
    • H01J2229/0053—Demagnetisation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/96—Circuit elements other than coils, reactors or the like, associated with the tube
    • H01J2229/964—Circuit elements other than coils, reactors or the like, associated with the tube associated with the deflection system

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

1,048,452. Demagnetizing apparatus. HOLLANDSE SIGNAALAPPARATEN N.V. Feb. 2, 1965 [Feb. 12, 1964], No. 4537/65. Heading H1P. [Also in Division H4]. In an arrangement for eliminating residual magnetism in the ferro-magnetic yoke 2 (Fig. 1) of a cathode-ray tube deflection system, each deflection coil L 1 and its associated damping resistors R 1 is shunted by a two-terminal network 4, comprising an inductance L 2 and an adjustable resistor R 2 either series connected, as shown, or parallel connected, the time-constant of such network being greater than that of L 1 , R 1 so that at the end of a cycle of the sawtooth waves from generator 3, when the driving current i 0 (see also Fig. 2, not shown) has reached zero, the current i L1 in the deflection coils decays at a faster rate than the current i L2 in network 4 and thus when the former current reaches zero (T 2 , Fig. 2) the continued decay of the latter results in a current flow through L 1 in the opposite direction to the original decay current. This negative current eliminates the residual magnetism and the next beam deflection commencing at T 3 (Fig. 2) is independent of the previous one. The networks 4 may be located at a position remote from the tube and may be shunted across only part of the coils L 1 .
GB4537/65A 1964-02-12 1965-02-02 Improvements in or relating to magnetic deflecting means for cathode-ray tubes Expired GB1048452A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL646401167A NL140650B (en) 1964-02-12 1964-02-12 DEFLECTION SYSTEM FOR A CATHOD RADIUS TUBE WHICH SYSTEM EQUIPPES EACH DEFLECTION COIL WITH RESISTANT MEANS FOR CANCELLATION OF REMANENT MAGNETISM IN THE FERROMAGNETIC CORE OF THE NORMALITER CRITICALLY MUFFLED.

Publications (1)

Publication Number Publication Date
GB1048452A true GB1048452A (en) 1966-11-16

Family

ID=19789250

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4537/65A Expired GB1048452A (en) 1964-02-12 1965-02-02 Improvements in or relating to magnetic deflecting means for cathode-ray tubes

Country Status (6)

Country Link
US (1) US3456149A (en)
BE (1) BE659100A (en)
CH (1) CH415741A (en)
DE (1) DE1274744B (en)
GB (1) GB1048452A (en)
NL (1) NL140650B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095143A (en) * 1976-07-21 1978-06-13 Gte Sylvania Incorporated Electron beam crossover correction circuitry

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7112929A (en) * 1971-09-21 1973-03-23
NL7707476A (en) * 1977-07-06 1979-01-09 Philips Nv PROCEDURE FOR MANUFACTURING A COLOR IMAGE TUBE AND COLOR IMAGE TUBE MADE IN ACCORDANCE WITH THAT PROCESS.
JPH0339969U (en) * 1989-08-30 1991-04-17

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2007380A (en) * 1932-11-30 1935-07-09 Rca Corp Cathode ray apparatus
US2114841A (en) * 1936-04-16 1938-04-19 Westinghouse Electric & Mfg Co Regulating system
US2228821A (en) * 1938-10-01 1941-01-14 Gen Electric Magnetic sweep coil circuit
US2279849A (en) * 1940-05-16 1942-04-14 Gen Electric Control of electromagnetic devices
US3153174A (en) * 1961-01-27 1964-10-13 Westinghouse Electric Corp Television width linearity control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095143A (en) * 1976-07-21 1978-06-13 Gte Sylvania Incorporated Electron beam crossover correction circuitry

Also Published As

Publication number Publication date
US3456149A (en) 1969-07-15
NL140650B (en) 1973-12-17
DE1274744B (en) 1968-08-08
NL6401167A (en) 1965-08-13
BE659100A (en) 1965-05-28
CH415741A (en) 1966-06-30

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