GB546507A - Cathode ray tube circuits - Google Patents

Cathode ray tube circuits

Info

Publication number
GB546507A
GB546507A GB3898/41A GB389841A GB546507A GB 546507 A GB546507 A GB 546507A GB 3898/41 A GB3898/41 A GB 3898/41A GB 389841 A GB389841 A GB 389841A GB 546507 A GB546507 A GB 546507A
Authority
GB
United Kingdom
Prior art keywords
cathode
resistance
switch
condenser
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
GB3898/41A
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.)
Philco Radio and Television Corp
Original Assignee
Philco Radio and Television 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 Radio and Television Corp filed Critical Philco Radio and Television Corp
Publication of GB546507A publication Critical patent/GB546507A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • X-Ray Techniques (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

546,507. Cathode-ray oscillographs. PHILCO RADIO & TELEVISION CORPORATION. March 21, 1941, No. 3898. Convention date, March 21, 1940. [Class 37] [Also in Group XL] Cathode-ray tubes energized by rectifiers are provided with a condenser which is charged when the circuit is in operation and is so arranged that, when the rectifier is switched off, voltage is applied from the condenser to an electrode of the cathode-ray tube to stop or reduce the electron beam to prevent damage to the screen. As shown in Fig. 1, when the main switch 13 is closed, switch 27 is also closed, working bias is applied to the cathode of the cathode-ray tube through the potentiometer 28, 15, and the condenser 24 is charged to a high potential determined by the ratio of the resistance 25 to the resistance 26 plus the part of the resistance 15 in series with it to earth. When the switch 13 is turned off, the switch 27 is also turned off and the voltage from the condenser 24 is then imparted to the cathode of the cathode-ray tube with the result that the electron beam ceases. The other parts of the circuit of Fig. 1 are substantially as usual for a television receiver. In a modification, Fig. 2, also showing a television receiver, the switch 13 is coupled to a switch 41. The cathode potential is determined by cathode potentiometer 42, 40 of valve 2. When the switch 41 is closed, the resistance 40 which is high is shunted by the resistance 35 which is low, the latter resistance bay shunted by a condenser 37 to by-pass A.C. components. When the switches are turned off, the voltage on the condenser 39 is applied to the cathode of cathoderay tube, which is then separated from earth by the high resistance 40.
GB3898/41A 1940-03-21 1941-03-21 Cathode ray tube circuits Expired GB546507A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US325241A US2280670A (en) 1940-03-21 1940-03-21 Cathode ray tube circuit

Publications (1)

Publication Number Publication Date
GB546507A true GB546507A (en) 1942-07-16

Family

ID=23267028

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3898/41A Expired GB546507A (en) 1940-03-21 1941-03-21 Cathode ray tube circuits

Country Status (2)

Country Link
US (1) US2280670A (en)
GB (1) GB546507A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE968817C (en) * 1951-09-24 1958-04-03 Philips Nv Protection circuit for the picture tube of a television receiver with a permanent magnet

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2537973A (en) * 1944-01-14 1951-01-16 Sperry Corp Radar indication system
US2498579A (en) * 1946-01-07 1950-02-21 George A Roberts Beam blanking and sweep control
US2537807A (en) * 1946-12-11 1951-01-09 John Logie Baird Ltd Thermionic amplifier
US2550960A (en) * 1947-05-21 1951-05-01 Hazeltine Research Inc Television receiver contrast and brightness control
US2654800A (en) * 1948-10-26 1953-10-06 Rca Corp Television-to-radio voltage changing system
US2617964A (en) * 1949-12-30 1952-11-11 Philco Corp Current-limiting circuit for cathode-ray tubes
US2577848A (en) * 1950-02-16 1951-12-11 Rca Corp Protective circuit
NL79345C (en) * 1951-02-09
US2638562A (en) * 1952-06-18 1953-05-12 Avco Mfg Corp Kinescope residual beam extinction circuit
NL179235B (en) * 1952-06-27 Hoffmann La Roche CUVET FOR PHOTOMETRIC ANALYSIS.
DE1055699B (en) * 1953-03-04 1959-04-23 Philips Patentverwaltung Operating circuit to protect the screen of a cathode ray tube
US2940004A (en) * 1957-07-01 1960-06-07 Philco Corp Apparatus for quick beam extinction in television receivers
US3114794A (en) * 1960-06-30 1963-12-17 Rca Corp Color television receiver control apparatus
US5357776A (en) * 1993-06-16 1994-10-25 Avibank Mfg., Inc. Method of forming bushing rings
US5828190A (en) * 1997-05-15 1998-10-27 Zenith Electronics Corporation G1 High frequency drive for color cathode ray tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE968817C (en) * 1951-09-24 1958-04-03 Philips Nv Protection circuit for the picture tube of a television receiver with a permanent magnet

Also Published As

Publication number Publication date
US2280670A (en) 1942-04-21

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