GB495385A - Improvements relating to the magnetic focussing of cathode ray tubes - Google Patents
Improvements relating to the magnetic focussing of cathode ray tubesInfo
- 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
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.
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) |
-
1937
- 1937-05-11 GB GB1339037A patent/GB495385A/en not_active Expired
-
1938
- 1938-05-11 FR FR837817D patent/FR837817A/en not_active Expired
-
1945
- 1945-06-15 FR FR54202D patent/FR54202E/en not_active Expired
- 1945-10-29 FR FR54239D patent/FR54239E/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR54239E (en) | 1948-06-25 |
| FR837817A (en) | 1939-02-21 |
| FR54202E (en) | 1948-06-25 |
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