GB659596A - Improvements in or relating to television or like systems - Google Patents
Improvements in or relating to television or like systemsInfo
- Publication number
- GB659596A GB659596A GB21006/49A GB2100649A GB659596A GB 659596 A GB659596 A GB 659596A GB 21006/49 A GB21006/49 A GB 21006/49A GB 2100649 A GB2100649 A GB 2100649A GB 659596 A GB659596 A GB 659596A
- Authority
- GB
- United Kingdom
- Prior art keywords
- apertures
- electrodes
- anode
- television
- target
- 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
- H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
- H04N3/32—Velocity varied in dependence upon picture information
-
- 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
- H01J31/42—Image pick-up tubes having an input of visible light and electric output with image screen generating a composite electron beam which is deflected as a whole past a stationary probe to simulate a scanning effect, e.g. Farnsworth pick-up tube
- H01J31/44—Tubes with image amplification section
-
- 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
- H04N3/36—Scanning of motion picture films, e.g. for telecine
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
- H04N7/122—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal involving expansion and subsequent compression of a signal segment, e.g. a frame, a line
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Abstract
659,596. Cathode-ray tubes. COMPAGNIE POUR LA FABRICATION DES COMPTEURS ET MATERIEL D'USINES A GAZ. Aug. 12, 1949, Nos. 21006 and 21007. Convention dates, Aug. 20, 1948 and Dec. 1, 1948. [Class 39 (i)] [Also in Group XL (b)] An image converter tube 74, Fig. 7, is employed in a circuit for comparing the intensity of corresponding points in successive frames a, b of film 68 in a television transmitter (see Group XL (b)), and comprises a photocathode 73 upon which is projected corresponding whole lines of the two frames. The resulting electron images are focused in the plane of two apertures 78, 79 by means of anode 76 and coil 75, and are scanned across the apertures by deflection coils 77. The diaphragm containing the apertures is connected to anode 76. Beyond the apertures are situated ring electrodes 80, 81 shielded from each other by partition 82. A source 83 of high frequency alternating voltage is connected to electrodes 80, 81 through a transformer 84, the centre tap 85 of which is returned to the same potential as the apertures. By this means, a potential sufficiently negative with respect to the apertures to cause them to be blocked is applied alternately to the electrodes 80, 81 and the electron beams thus allowed to pass in alternation to a multiplier section comprising a series of grids sensitized for a high secondary emission coefficient. An impedance 88 is connected to derive an output from the current collected at the final grid 86; the current being further amplified by secondary emission from a solid electrode 87. A storage cathode-ray tube 35, Fig. 4, is employed in the television receiver and comprises a storage target 40 of high insulation scanned under the control of electrodes 37, 38. The television video signal is applied to a mesh electrode 39 and controls the potentials to which the various portions of the target move by virtue of the loss of secondary electrons under the primary impart. The charge pattern stored on the target influences a photocathode mesh 41 illuminated 'by an intense source of light (not shown), and thereby controls the production of an electron image which, accelerated by anode 42 and focused by coil 36, results in a visible image on an aluminized fluorescent screen 44.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR837108X | 1948-12-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB659596A true GB659596A (en) | 1951-10-24 |
Family
ID=9298437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21006/49A Expired GB659596A (en) | 1948-12-01 | 1949-08-12 | Improvements in or relating to television or like systems |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE837108C (en) |
| FR (2) | FR1010457A (en) |
| GB (1) | GB659596A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3240872A (en) * | 1961-08-28 | 1966-03-15 | Burroughs Corp | Scan control apparatus for character recognition devices |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110783159B (en) * | 2019-10-31 | 2021-11-19 | 北方夜视技术股份有限公司 | Low background reflection scanning image converter tube and manufacturing method thereof |
-
1948
- 1948-08-20 FR FR1010457D patent/FR1010457A/en not_active Expired
- 1948-12-01 FR FR1011071D patent/FR1011071A/en not_active Expired
-
1949
- 1949-08-12 GB GB21006/49A patent/GB659596A/en not_active Expired
-
1950
- 1950-09-29 DE DEC2732A patent/DE837108C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3240872A (en) * | 1961-08-28 | 1966-03-15 | Burroughs Corp | Scan control apparatus for character recognition devices |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1011071A (en) | 1952-06-18 |
| DE837108C (en) | 1952-04-21 |
| FR1010457A (en) | 1952-06-11 |
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