GB537695A - Improvements in or relating to cathode ray tubes - Google Patents
Improvements in or relating to cathode ray tubesInfo
- Publication number
- GB537695A GB537695A GB62/40A GB6240A GB537695A GB 537695 A GB537695 A GB 537695A GB 62/40 A GB62/40 A GB 62/40A GB 6240 A GB6240 A GB 6240A GB 537695 A GB537695 A GB 537695A
- Authority
- GB
- United Kingdom
- Prior art keywords
- deflecting
- valves
- cut
- control grid
- during
- 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
- 230000000737 periodic effect Effects 0.000 abstract 1
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
537,695. Television. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Jan. 1, 1940, No. 62. Convention date, Dec. 30, 1938. [Class 40 (iii)] The periodic deflecting voltage is utilized to cut off the cathode ray both on the failure of either deflecting voltage and also during the return periods of the deflecting voltages. Impulses from the line and frame deflecting circuits 13, 14 are applied over circuits 16, 17 to valves 18, 19, the anode circuits of which are supplied through a common resistance 30, which is connected to the control grid 3 of the C.R.T. 6. During the " return " periods, the positive impulses applied over condenser-resistance combinations to the grids of the valves 18, 19, overcome the normal negative bias and cause the valves to pass current freely and reduce the potential on the control grid 3 to cut off the ray. During the period between such impulses, the condensers 23, 46 discharge and bias the valves 18, 19 negatively. If either deflecting circuit fails, valve 18 or 19 passes current freely, thus reducing the potential on the control grid 3 to cut off the ray.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US248570A US2261776A (en) | 1938-12-30 | 1938-12-30 | Cathode ray tube apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB537695A true GB537695A (en) | 1941-07-02 |
Family
ID=22939683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB62/40A Expired GB537695A (en) | 1938-12-30 | 1940-01-01 | Improvements in or relating to cathode ray tubes |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2261776A (en) |
| GB (1) | GB537695A (en) |
| NL (1) | NL59024C (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2425491A (en) * | 1943-06-22 | 1947-08-12 | Rca Corp | Deflection circuit |
| US2520155A (en) * | 1945-06-08 | 1950-08-29 | Int Standard Electric Corp | Sweep circuit for cathode-ray tubes |
| US2536712A (en) * | 1947-05-27 | 1951-01-02 | Rca Corp | Protective system |
| US2543831A (en) * | 1948-02-10 | 1951-03-06 | Belmont Radio Corp | Protection of cathode-ray tube screens |
| US2635208A (en) * | 1948-04-21 | 1953-04-14 | John M Cage | Television circuit |
| US2607847A (en) * | 1949-11-08 | 1952-08-19 | Motorola Inc | Vertical retrace blanking |
| US2577848A (en) * | 1950-02-16 | 1951-12-11 | Rca Corp | Protective circuit |
| NL79345C (en) * | 1951-02-09 | |||
| US2646526A (en) * | 1952-03-08 | 1953-07-21 | Hazeltine Research Inc | System for generating scanning currents |
| US2743380A (en) * | 1952-05-08 | 1956-04-24 | Emi Ltd | Protection circuits for cathode ray tubes |
| US2709768A (en) * | 1952-06-05 | 1955-05-31 | Gen Precision Lab Inc | Cathode ray tube protection circuits |
| US2863053A (en) * | 1954-10-26 | 1958-12-02 | Hoffman Electronics Corp | Height gate generators or the like |
| US2808536A (en) * | 1954-11-18 | 1957-10-01 | Rca Corp | Cathode ray tube protecting and energizing circuits |
| US2846616A (en) * | 1954-12-08 | 1958-08-05 | Philips Corp | Circuit-arrangement protecting the cathode-ray tube of television receivers |
| US2860283A (en) * | 1956-03-07 | 1958-11-11 | Isaac S Blonder | Electronic protective system |
| US2864969A (en) * | 1957-02-26 | 1958-12-16 | Shulman Abraham | Off-screen blanking circuit |
-
0
- NL NL59024D patent/NL59024C/xx active
-
1938
- 1938-12-30 US US248570A patent/US2261776A/en not_active Expired - Lifetime
-
1940
- 1940-01-01 GB GB62/40A patent/GB537695A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL59024C (en) | |
| US2261776A (en) | 1941-11-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB537695A (en) | Improvements in or relating to cathode ray tubes | |
| GB435816A (en) | Improvements in or relating to thermionic valve circuit arrangements for use as electrical time period devices | |
| GB485120A (en) | Improvements in or relating to relaxation oscillation generators | |
| GB546507A (en) | Cathode ray tube circuits | |
| GB467915A (en) | Improvements in or relating to electron discharge devices and to circuits therefor | |
| GB499487A (en) | Improvements in or relating to electron discharge devices for voltage amplification or control | |
| US2268830A (en) | Discharge tube arrangement | |
| GB437804A (en) | Improvements in or relating to thermionic valves for use in radio signalling systems | |
| GB423685A (en) | Improvements in and relating to television and like systems | |
| GB473650A (en) | Improvements in or relating to thermionic valve circuits | |
| GB413544A (en) | Improvements in or relating to thermionic valve circuit arrangements | |
| GB474776A (en) | Improvements in or relating to television and like systems | |
| GB464064A (en) | Back-coupled circuit for cathode-ray tube, more especially for television purposes | |
| GB517671A (en) | Improvements in or relating to thermionic valves and circuit arrangements therefor | |
| GB469896A (en) | Improvements in or relating to automatic gain control circuit arrangements | |
| GB410606A (en) | Improvements in or relating to electric discharge devices | |
| GB418991A (en) | Improvements in or relating to gas-filled electric discharge valves and circuit arrangements incorporating the same | |
| GB493279A (en) | Improvements in or relating to television and like systems | |
| GB412690A (en) | Improvements in or relating to wireless receiving systems | |
| GB532920A (en) | Improvements in or relating to electron discharge apparatus | |
| GB522808A (en) | Improvements in thermionic time delay circuits | |
| GB369038A (en) | Improvements in high tension supply units and rectifying tubes therefor | |
| GB452730A (en) | Improvements in or relating to television receiving systems | |
| GB379957A (en) | Improvements in or relating to thermionic valve circuits | |
| GB539490A (en) | Improvements in or relating to electron discharge arrangements employing electron beams |