GB495385A - Improvements relating to the magnetic focussing of cathode ray tubes - Google Patents

Improvements relating to the magnetic focussing of cathode ray tubes

Info

Publication number
GB495385A
GB495385A GB1339037A GB1339037A GB495385A GB 495385 A GB495385 A GB 495385A GB 1339037 A GB1339037 A GB 1339037A GB 1339037 A GB1339037 A GB 1339037A GB 495385 A GB495385 A GB 495385A
Authority
GB
United Kingdom
Prior art keywords
coil
resistance
focusing
circuit
voltage
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
GB1339037A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB1339037A priority Critical patent/GB495385A/en
Priority to FR837817D priority patent/FR837817A/en
Publication of GB495385A publication Critical patent/GB495385A/en
Priority to FR54202D priority patent/FR54202E/en
Priority to FR54239D priority patent/FR54239E/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • X-Ray Techniques (AREA)

Abstract

495,385. Supply systems for cathoderay tubes. BRITISH THOMSON-HOUSTON CO., Ltd., and MYNALL, D. J. May 11, 1937, No. 13390. [Class 38 (iv)] In a system in which the supply voltages for the anode and for the focusing coil of i cathode ray tube may vary to gether, in order to maintain correct focusing, the coil 1 is supplied from the source E through a resistance R3 and is shunted by a resistance R2 in series with a glow discharge tube 4 having a breakdown voltage e. The constants of the circuit are such that eR3= ER2 and R3 is less than E-e/I where I is the focusing current. By this means the focusing current is caused to vary with the supply voltage and the anode voltage V of the tube so that I varies as the square root of the voltage V whereby correct focusing is maintained. The source E may be a rectifier and an adjustable resistance may be included in series or in parallel in the coil circuit. The resistance 3 may be wholly or partly in the source E. The resistances 2 and 3 may be variable. The auxiliary resistance in the circuit of the coil 1 is effective to control focusing and to reduce variations in the resistance of the coil circuit with change of temperature of the coil 1.
GB1339037A 1937-05-11 1937-05-11 Improvements relating to the magnetic focussing of cathode ray tubes Expired GB495385A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB1339037A GB495385A (en) 1937-05-11 1937-05-11 Improvements relating to the magnetic focussing of cathode ray tubes
FR837817D FR837817A (en) 1937-05-11 1938-05-11 Improvements to cathode ray tube circuits
FR54202D FR54202E (en) 1937-05-11 1945-06-15 Improvements to cathode ray tube circuits
FR54239D FR54239E (en) 1937-05-11 1945-10-29 Improvements to cathode ray tube circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1339037A GB495385A (en) 1937-05-11 1937-05-11 Improvements relating to the magnetic focussing of cathode ray tubes

Publications (1)

Publication Number Publication Date
GB495385A true GB495385A (en) 1938-11-11

Family

ID=10022088

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1339037A Expired GB495385A (en) 1937-05-11 1937-05-11 Improvements relating to the magnetic focussing of cathode ray tubes

Country Status (2)

Country Link
FR (3) FR837817A (en)
GB (1) GB495385A (en)

Also Published As

Publication number Publication date
FR54239E (en) 1948-06-25
FR54202E (en) 1948-06-25
FR837817A (en) 1939-02-21

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