GB1146180A - Beam current limitation in cathode-ray tubes - Google Patents

Beam current limitation in cathode-ray tubes

Info

Publication number
GB1146180A
GB1146180A GB5834566A GB5834566A GB1146180A GB 1146180 A GB1146180 A GB 1146180A GB 5834566 A GB5834566 A GB 5834566A GB 5834566 A GB5834566 A GB 5834566A GB 1146180 A GB1146180 A GB 1146180A
Authority
GB
United Kingdom
Prior art keywords
beam current
cathode
circuit
dec
earth
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
GB5834566A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1146180A publication Critical patent/GB1146180A/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
    • H04N5/141—Beam current control means

Abstract

1,146,180. Cathode-ray tube circuits. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 30 Dec., 1966 [31 Dec., 1965], No. 58345/66. Heading H4T. The average beam current of a cathode-ray tube 1 is limited to a predetermined maximum value by means of an RC circuit 15, 16, connected between earth and the negative pole of the EHT supply, and so proportioned that, when the beam current reaches such maximum value, the voltage developed across the circuit (of negative polarity with respect to earth) causes diode 17 to conduct so that the control grid 3 then follows such voltage and prevents further increase in beam current. With this arrangement overloading of the EHT source and of the normal supply stage, particularly important in the case of battery operated portable television receivers, is prevented with introducing image distortion as in known current limiting proposals. The brightness of the display is controlled by means 14 which, during normal operation biases grid 3 to a potential more negative than the potential across circuit 15, 16 so that diode 17 is non-conductive.
GB5834566A 1965-12-31 1966-12-30 Beam current limitation in cathode-ray tubes Expired GB1146180A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6517217A NL6517217A (en) 1965-12-31 1965-12-31

Publications (1)

Publication Number Publication Date
GB1146180A true GB1146180A (en) 1969-03-19

Family

ID=19795089

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5834566A Expired GB1146180A (en) 1965-12-31 1966-12-30 Beam current limitation in cathode-ray tubes

Country Status (12)

Country Link
JP (1) JPS5021812B1 (en)
AT (1) AT263099B (en)
BE (1) BE691956A (en)
CH (1) CH442424A (en)
DE (1) DE1462879A1 (en)
DK (1) DK114419B (en)
ES (1) ES335052A1 (en)
FR (1) FR1507094A (en)
GB (1) GB1146180A (en)
NL (1) NL6517217A (en)
NO (1) NO117987B (en)
SE (1) SE323987B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2294621A (en) * 1994-09-16 1996-05-01 Lg Electronics Inc Automatic brightness control apparatus for a monitor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2294621A (en) * 1994-09-16 1996-05-01 Lg Electronics Inc Automatic brightness control apparatus for a monitor

Also Published As

Publication number Publication date
FR1507094A (en) 1967-12-22
DK114419B (en) 1969-06-30
SE323987B (en) 1970-05-19
NO117987B (en) 1969-10-20
DE1462879A1 (en) 1969-01-09
CH442424A (en) 1967-08-31
NL6517217A (en) 1967-07-03
ES335052A1 (en) 1967-11-16
JPS5021812B1 (en) 1975-07-25
AT263099B (en) 1968-07-10
BE691956A (en) 1967-06-29

Similar Documents

Publication Publication Date Title
GB546507A (en) Cathode ray tube circuits
GB945145A (en) Improvements relating to circuits for protecting the luminescent coatings of cathoderay tubes
GB1146180A (en) Beam current limitation in cathode-ray tubes
GB1281462A (en) Automatic brightness control
GB1285210A (en) Power supply for camera system including image intensifier
GB840288A (en) Improvements in or relating to electric circuits including electron discharge devices having at least one secondary emissive electrode
GB957050A (en) Improvements in or relating to television receivers
GB966711A (en) Improvements in and relating to amplifier circuits
GB1059125A (en) Improvements relating to circuits for protecting the luminescent coating of a cathode ray tube
GB740613A (en) Improvements in or relating to television receivers
US2631233A (en) Secondary emission trigger circuit
GB1226041A (en)
US2541918A (en) Unidirectional power supply
US2684442A (en) Multivibrator
GB1269388A (en) Beam current limiting arrangement
US2960609A (en) Geiger counter
GB726861A (en) Beam cut-off circuit for cathode-ray tubes
US2424214A (en) Unidirectional voltage generator
GB661807A (en) Television film scanning apparatus
US3601533A (en) Regulated high voltage supply
GB702604A (en) Improvements relating to e.h.t. supply circuits for television viewing tubes
GB757641A (en) Monostable multivibrator
GB908798A (en) Improvements in or relating to cathode ray tube deflection circuits
GB874126A (en) Improvements in or relating to cathode ray tube circuits
GB1124755A (en) Improvements relating to cathode ray tube circuits, especially for television receivers