GB562149A - Improvements in television pick-up tubes - Google Patents
Improvements in television pick-up tubesInfo
- Publication number
- GB562149A GB562149A GB17965/42A GB1796542A GB562149A GB 562149 A GB562149 A GB 562149A GB 17965/42 A GB17965/42 A GB 17965/42A GB 1796542 A GB1796542 A GB 1796542A GB 562149 A GB562149 A GB 562149A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrons
- screen
- auxiliary
- target
- electron
- 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
- 230000002159 abnormal effect Effects 0.000 abstract 2
- 238000010276 construction Methods 0.000 abstract 2
- 239000002245 particle Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/26—Image pick-up tubes having an input of visible light and electric output
- H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
- H01J31/34—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at cathode potential, e.g. orthicon
Landscapes
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
562,149. Cathode-ray tubes. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Dec. 17, 1942, No. 17965. Convention date, Aug. 29, 1941. [Class 39 (i)] In a television pick-up tube having a mosaic target M, a source of electrons 4 and means G for forming these into a beam of low velocity electrons and means 24 and 26 for causing the beam to scan the target, further means are provided for providing an auxiliary reservoir of electrons which are under such control that they are drawn to particles of the screen which are subjected to light of abnormal intensity. They thus neutralize charged portions on the screen that the normal scanning beam cannot deal with alone. In the arrangement shown, the auxiliary supply consists of a second electron gun V which is maintained at a different potential from the main gun G so that its electrons will not reach target M unless this has an abnormal positive charge. In another construction, the auxiliary electrons are supplied by an electron-emissive ring electrode surrounding the scanning beam. This in a similar manner to the other construction is maintained at a more positive potential than the main electron supply in order that electrons therefrom only pass to portions of the screen that are abnormally positive.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US408882A US2345282A (en) | 1941-08-29 | 1941-08-29 | Television pickup tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB562149A true GB562149A (en) | 1944-06-20 |
Family
ID=23618163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17965/42A Expired GB562149A (en) | 1941-08-29 | 1942-12-17 | Improvements in television pick-up tubes |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2345282A (en) |
| GB (1) | GB562149A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2733292A (en) * | 1956-01-31 | System fqb correcting-the-equilibrium | ||
| US2465667A (en) * | 1945-01-09 | 1949-03-29 | Rca Corp | Method of and means for controlling the beam current in television camera tubes |
| US2451640A (en) * | 1945-05-11 | 1948-10-19 | Rca Corp | Control system |
| US2556824A (en) * | 1946-03-28 | 1951-06-12 | Rca Corp | Cathode-ray tube |
| US2726347A (en) * | 1953-04-30 | 1955-12-06 | Rca Corp | Multiple-beam electron gun |
| US2866918A (en) * | 1953-06-30 | 1958-12-30 | Hughes Aircraft Co | Electronic camera tube |
| NL206590A (en) * | 1955-04-29 | |||
| US3005927A (en) * | 1958-01-27 | 1961-10-24 | Rca Corp | Cathode-ray tubes of the focus-mask variety |
-
1941
- 1941-08-29 US US408882A patent/US2345282A/en not_active Expired - Lifetime
-
1942
- 1942-12-17 GB GB17965/42A patent/GB562149A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2345282A (en) | 1944-03-28 |
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