GB688857A - Improvements relating to the control of cathode ray tubes - Google Patents
Improvements relating to the control of cathode ray tubesInfo
- Publication number
- GB688857A GB688857A GB1922350A GB1922350A GB688857A GB 688857 A GB688857 A GB 688857A GB 1922350 A GB1922350 A GB 1922350A GB 1922350 A GB1922350 A GB 1922350A GB 688857 A GB688857 A GB 688857A
- Authority
- GB
- United Kingdom
- Prior art keywords
- variations
- focus
- valve
- cathode
- ray tubes
- 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
- H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
688,857. Cathode-ray tubes. WHITE-IBBOTSON, Ltd. July 26, 1951 (Aug. 1, 1950; Sept. 13, 1950], Nos. 19223/50 and 22556/50. Class 39(i) [Also in Group XXXV] A circuit arrangement for stabilising the focus of the electron beam of a cathode-ray tube comprises an E.H.T. generating unit of the saw tooth oscillatory type wherein potential variations in the value of the E.H.T. due to variations in the beam current of the tube are fed back from a winding S4 on the output transformer to the control grid 2 of the generating valve DV, the variations appear ing in an amplified form at the screen grid 3 of the valve DV and fed to the screen grid 4 of the focus valve FV, which has the focus coil FC in its anode circuit, thereby altering the current in the focus coil, the combination of the two feed back components being such as to keep the focus of the tube constant irrespective of variations in the beam current. Various other methods of deriving the potential applied to the valve FV are described in one of which compensation is effected for variations in the temperature-and thus the resistance-of the focus coil FC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1922350A GB688857A (en) | 1950-08-01 | 1950-08-01 | Improvements relating to the control of cathode ray tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1922350A GB688857A (en) | 1950-08-01 | 1950-08-01 | Improvements relating to the control of cathode ray tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB688857A true GB688857A (en) | 1953-03-18 |
Family
ID=10125774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1922350A Expired GB688857A (en) | 1950-08-01 | 1950-08-01 | Improvements relating to the control of cathode ray tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB688857A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2914698A (en) * | 1956-03-26 | 1959-11-24 | Ibm | Convergence current regulator |
| GB2142207A (en) * | 1983-06-22 | 1985-01-09 | Raytheon Co | Pseudo-raster weather display apparatus |
-
1950
- 1950-08-01 GB GB1922350A patent/GB688857A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2914698A (en) * | 1956-03-26 | 1959-11-24 | Ibm | Convergence current regulator |
| GB2142207A (en) * | 1983-06-22 | 1985-01-09 | Raytheon Co | Pseudo-raster weather display apparatus |
| US4678969A (en) * | 1983-06-22 | 1987-07-07 | Raytheon Company | Pseudo-raster weather display apparatus |
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