GB771454A - Improvements in or relating to protection circuits for cathode ray tubes and the like - Google Patents
Improvements in or relating to protection circuits for cathode ray tubes and the likeInfo
- Publication number
- GB771454A GB771454A GB1747954A GB1747954A GB771454A GB 771454 A GB771454 A GB 771454A GB 1747954 A GB1747954 A GB 1747954A GB 1747954 A GB1747954 A GB 1747954A GB 771454 A GB771454 A GB 771454A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relating
- video
- screen
- arrangement
- cathode ray
- 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)
- Details Of Television Scanning (AREA)
Abstract
771,454. Television. MULLARD RADIO VALVE CO., Ltd. June 14,1954, No. 17479/54. Class 40 (3). [Also in Group XL (c)] In an arrangement for preventing damage to the screen of a television receiver cathode-ray tube V1 (see Group XL (c)) the grid of the tube is connected to a point X on a network including pentode V4 and 250 v. positive and negative D.C. voltage supplies B1 and B2 such that V4 is conductive under normal operating conditions but is cut-off if either the line or frame timebase fails, thereby biasing off the cathoderay beam. In such an arrangement some degree of automatic black level or brightness control may be obtained by deriving the H.T. of V4 from a video-sensitive source, e.g. the screen of video valve V2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1747954A GB771454A (en) | 1954-06-14 | 1954-06-14 | Improvements in or relating to protection circuits for cathode ray tubes and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1747954A GB771454A (en) | 1954-06-14 | 1954-06-14 | Improvements in or relating to protection circuits for cathode ray tubes and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB771454A true GB771454A (en) | 1957-04-03 |
Family
ID=10095888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1747954A Expired GB771454A (en) | 1954-06-14 | 1954-06-14 | Improvements in or relating to protection circuits for cathode ray tubes and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB771454A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990007842A2 (en) * | 1988-12-23 | 1990-07-12 | Rank Cintel Limited | Compensation of losses and defects in telecine devices |
| EP0532129A1 (en) * | 1988-12-23 | 1993-03-17 | Rank Cintel Limited | Improvements in and relating to flying spot scanners |
-
1954
- 1954-06-14 GB GB1747954A patent/GB771454A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990007842A2 (en) * | 1988-12-23 | 1990-07-12 | Rank Cintel Limited | Compensation of losses and defects in telecine devices |
| WO1990007842A3 (en) * | 1988-12-23 | 1990-09-07 | Rank Cintel Ltd | Compensation of losses and defects in telecine devices |
| EP0532129A1 (en) * | 1988-12-23 | 1993-03-17 | Rank Cintel Limited | Improvements in and relating to flying spot scanners |
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