GB864933A - Improvements in or relating to cathode ray tube circuits - Google Patents
Improvements in or relating to cathode ray tube circuitsInfo
- Publication number
- GB864933A GB864933A GB3744457A GB3744457A GB864933A GB 864933 A GB864933 A GB 864933A GB 3744457 A GB3744457 A GB 3744457A GB 3744457 A GB3744457 A GB 3744457A GB 864933 A GB864933 A GB 864933A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- circuit
- time
- triode
- 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
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)
- Particle Accelerators (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Electron Sources, Ion Sources (AREA)
Abstract
864,933. Cathode-ray tube circuits. BUSH & RANK ClNTEL Ltd. Dec. 2, 1958 [Dec. 2, 1957], No. 37444/57. Class 40(7) Relates to circuits for preventing the production of a focused beam in a cathode-ray tube in the absence of both or one of two scanning generator outputs. The frame time-base potential at terminal 1 is amplified by valve 3 and fed to voltage-doubling peak-rectifier 12... 15. The rectified signal is fed to triode 17 together with the line time-base signal from terminal 18. The cathode of triode 17 is so biased, from divider 21 . . . 24, that a relay 20, which controls the production and/or focus of the C.R.T. beam, and which is in the anode circuit of the triode 17, is operated only when both inputs are simultaneously present. A small inverse current is passed through relay 20 from resistor 31 to render the circuit more sensitive to changes in the operating signals and to reduce its release time. Upon first energising the circuit, positive surges at the anode of valve 3 are by-passed from the rectifiers 12, 13 by a rectifier 25 which, after an interval, becomes non-conducting due to the application of a positive potential to its cathode from voltage-divider 27, 28 which includes a time-constant condenser 26. Such surges are also reduced by the provision of a time-constant cathode biasing circuit 6, 7 and screen grid supply circuit 29, 30. The gain of valve 3 is stabilized by a feedback circuit 9, 10, 11.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3744457A GB864933A (en) | 1957-12-02 | 1957-12-02 | Improvements in or relating to cathode ray tube circuits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3744457A GB864933A (en) | 1957-12-02 | 1957-12-02 | Improvements in or relating to cathode ray tube circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB864933A true GB864933A (en) | 1961-04-12 |
Family
ID=10396518
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3744457A Expired GB864933A (en) | 1957-12-02 | 1957-12-02 | Improvements in or relating to cathode ray tube circuits |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB864933A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2256778A (en) * | 1991-05-17 | 1992-12-16 | Thomson Consumer Electronics | Scan loss detector for a cathode ray tube |
-
1957
- 1957-12-02 GB GB3744457A patent/GB864933A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2256778A (en) * | 1991-05-17 | 1992-12-16 | Thomson Consumer Electronics | Scan loss detector for a cathode ray tube |
GB2256778B (en) * | 1991-05-17 | 1996-01-03 | Thomson Consumer Electronics | Scan loss detector for cathode ray tube |
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