GB649738A - Improvements in or relating to cathode ray tube circuits for television receivers - Google Patents

Improvements in or relating to cathode ray tube circuits for television receivers

Info

Publication number
GB649738A
GB649738A GB1555348A GB1555348A GB649738A GB 649738 A GB649738 A GB 649738A GB 1555348 A GB1555348 A GB 1555348A GB 1555348 A GB1555348 A GB 1555348A GB 649738 A GB649738 A GB 649738A
Authority
GB
United Kingdom
Prior art keywords
potential
tube
cathode
grid
ray tube
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
GB1555348A
Inventor
Geoffrey George Bernard
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.)
SCOPHONY BAIRD Ltd
Original Assignee
SCOPHONY BAIRD 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 SCOPHONY BAIRD Ltd filed Critical SCOPHONY BAIRD Ltd
Priority to GB1555348A priority Critical patent/GB649738A/en
Priority to US81702A priority patent/US2540646A/en
Publication of GB649738A publication Critical patent/GB649738A/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
    • H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/148—Video amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information
    • H04N5/68—Circuit details for cathode-ray display tubes

Abstract

649,738. Television receivers. SCOPHONYBAIRD, Ltd. June 9, 1948, No. 15553. [Class 40 (iii)] In order to prevent excessive brilliance of the presentation on the screen of the cathoderay tube 12 of a television receiver, a limiting device 18 is so connected in the grid-cathode circuit of the cathode-ray tube as to prevent the potential of the cathode of tube 12 with respect to that of the control grid falling below a predetermined positive value. The signals derived from the video amplifier 10 are applied via the circuit 13, 14 to the cathode of the tube 12, the grid of which is maintained at a constant adjustable potential by means of the tapping on the potentiometer 16 which is byepassed to earth by the condenser 19. The diode 18 prevents the potential at the anode of valve 10 from falling below the potential of the grid of tube 12, whereby, since a steady potential is produced across the resistor 13 owing to the current flowing in the cathoderay tube, the potential of the cathode is not allowed to fall below a predetermined positive value with respect to that of the grid.
GB1555348A 1948-06-09 1948-06-09 Improvements in or relating to cathode ray tube circuits for television receivers Expired GB649738A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1555348A GB649738A (en) 1948-06-09 1948-06-09 Improvements in or relating to cathode ray tube circuits for television receivers
US81702A US2540646A (en) 1948-06-09 1949-03-16 Cathode-ray tube modulation circuits for television receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1555348A GB649738A (en) 1948-06-09 1948-06-09 Improvements in or relating to cathode ray tube circuits for television receivers

Publications (1)

Publication Number Publication Date
GB649738A true GB649738A (en) 1951-01-31

Family

ID=10061194

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1555348A Expired GB649738A (en) 1948-06-09 1948-06-09 Improvements in or relating to cathode ray tube circuits for television receivers

Country Status (1)

Country Link
GB (1) GB649738A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1227505B (en) * 1958-12-24 1966-10-27 Telefunken Patent Television receiver with a circuit to limit the beam current of the cathode ray tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1227505B (en) * 1958-12-24 1966-10-27 Telefunken Patent Television receiver with a circuit to limit the beam current of the cathode ray tube

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