GB1389154A - Device for fucussing and deflecting the electron beam in a cathode-ray tube - Google Patents

Device for fucussing and deflecting the electron beam in a cathode-ray tube

Info

Publication number
GB1389154A
GB1389154A GB3425273A GB3425273A GB1389154A GB 1389154 A GB1389154 A GB 1389154A GB 3425273 A GB3425273 A GB 3425273A GB 3425273 A GB3425273 A GB 3425273A GB 1389154 A GB1389154 A GB 1389154A
Authority
GB
United Kingdom
Prior art keywords
windings
resistor
cathode
ray tube
focusing 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
GB3425273A
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.)
OTHERS
Original Assignee
OTHERS
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 to US379391A priority Critical patent/US3896339A/en
Application filed by OTHERS filed Critical OTHERS
Priority to GB3425273A priority patent/GB1389154A/en
Priority to DE19732337088 priority patent/DE2337088C3/en
Priority to FR7328362A priority patent/FR2239761B1/fr
Publication of GB1389154A publication Critical patent/GB1389154A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/26—Modifications of scanning arrangements to improve focusing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/20—Cathode-ray oscilloscopes
    • G01R13/22—Circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/20—Cathode-ray oscilloscopes
    • G01R13/22—Circuits therefor
    • G01R13/24—Time-base deflection circuits
    • 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
    • H01J29/465—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement for simultaneous focalisation and deflection of ray or beam

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

1389154 Cathode-ray tube circuits; sawtooth current generators II EFIMOV M L LIFSHITS D D NIKIFOROV V P IVANOV L E LINETSKY V G LAZAREV and A I BRENIN 18 July 1973 34252/73 Headings H4T and H3T [Also in Division H1] A device for focusing and deflecting the electron beam of a cathode-ray tube comprises two series connected coaxially disposed windings 4, 5 (Fig. 1), the planes of the turns in each winding being symmetrically inclined at the same angle α relative to the axis 6 the windings being connected to an output stage 7 which is supplied from a power source 9 and a sawtooth voltage scanning frequency source 10. In operation, the sawtooth voltage unbalances a bridge formed by windings 4, 5 and resistors 12, 13 and transistor 11, causing equal and opposite currents to flow in the windings 4, 5, so that a constant current flows through resistor 16, windings 4, 5 and resistor 20. This current produces the required magnetic focusing field and to ensure constancy stabilization is effected by utilizing any variation in the voltage across resistor 20 to control the base of the transistor via diode 19 and resistor 18. An additional winding connected across the power source 9 may be employed to produce an additional focusing field which adds to the main focusing field produced by windings 4, 5 and adjustment of the current in such additional winding is stated to allow better matching between windings 4, 5 and the output stage 7 (Fig. 3, not shown). When the beam is also to be deflected in a second direction a second pair of suitably orientated windings 9 and appropriate drive circuitry is employed. The invention is stated to be suitable for portable T.V. cameras for use with video tape recorders, in closed circuit T.V. applications and with T.V. cameras for inspection of smalldiameter tubes.
GB3425273A 1973-07-18 1973-07-18 Device for fucussing and deflecting the electron beam in a cathode-ray tube Expired GB1389154A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US379391A US3896339A (en) 1973-07-18 1973-07-16 Device for focussing and deflection of an electron beam in a cathode-ray apparatus
GB3425273A GB1389154A (en) 1973-07-18 1973-07-18 Device for fucussing and deflecting the electron beam in a cathode-ray tube
DE19732337088 DE2337088C3 (en) 1973-07-20 Circuit arrangement for focusing and deflecting the electron beam of an electron beam device
FR7328362A FR2239761B1 (en) 1973-07-18 1973-08-02

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3425273A GB1389154A (en) 1973-07-18 1973-07-18 Device for fucussing and deflecting the electron beam in a cathode-ray tube

Publications (1)

Publication Number Publication Date
GB1389154A true GB1389154A (en) 1975-04-03

Family

ID=10363320

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3425273A Expired GB1389154A (en) 1973-07-18 1973-07-18 Device for fucussing and deflecting the electron beam in a cathode-ray tube

Country Status (3)

Country Link
US (1) US3896339A (en)
FR (1) FR2239761B1 (en)
GB (1) GB1389154A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4223253A (en) * 1978-03-21 1980-09-16 Rca Corporation Focusing system for color TV camera

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3502941A (en) * 1967-12-06 1970-03-24 Motorola Inc Horizontal sweep system protection circuit
US3760221A (en) * 1969-11-29 1973-09-18 New Nippon Electric Co Deflection and picture position adjusting apparatus
DE2103501C3 (en) * 1971-01-16 1980-06-12 Loewe Opta Gmbh, 1000 Berlin Circuit arrangement for generating a stabilized voltage in a horizontal deflection and high voltage stage
NL7102201A (en) * 1971-02-19 1972-08-22
US3784869A (en) * 1971-03-29 1974-01-08 Victor Co Ltd Vertical convergence circuit
NL7107285A (en) * 1971-05-26 1972-11-28 Philips Nv

Also Published As

Publication number Publication date
DE2337088B2 (en) 1976-08-19
FR2239761A1 (en) 1975-02-28
FR2239761B1 (en) 1976-11-12
US3896339A (en) 1975-07-22
DE2337088A1 (en) 1975-02-13

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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