GB687270A - Apparatus incorporating a video storage tube and method of operating same - Google Patents
Apparatus incorporating a video storage tube and method of operating sameInfo
- Publication number
- GB687270A GB687270A GB444749A GB444749A GB687270A GB 687270 A GB687270 A GB 687270A GB 444749 A GB444749 A GB 444749A GB 444749 A GB444749 A GB 444749A GB 687270 A GB687270 A GB 687270A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- storage
- plate
- collector
- giving
- 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
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/021—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof arrangements for eliminating interferences in the tube
-
- 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
- H01J31/30—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 anode potential, e.g. iconoscope
- H01J31/32—Tubes with image amplification section, e.g. image-iconoscope, supericonoscope
-
- 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
- H04N3/40—Scanning of motion picture films, e.g. for telecine with intermittently moving film
- H04N3/405—Scanning of motion picture films, e.g. for telecine with intermittently moving film with film moving only during the field blanking interval
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
687,270. Cathode-ray tubes. CATHODEON, Ltd. Feb. 17, 1950 [Feb. 18, 1949; April 20, 1949; July 2, 1949], Nos. 4447/49, 10537/49 and 17548/49. Class 39(i) In a video storage tube in which either a light image or an electron image is projected on to the storage target, the storage plate is subjected during the flyback periods of the scanning beam and preferably during the frame fiyback periods, to the simultaneous actions of an irradiation adapted to cause the,storage surface to emit electrons and of a field which causes said emitted electrons to return to the storage surface and charge it negatively. In Fig. 1 a storage tube 11 has a photo cathode 12, a storage plate 14 e.g. of mica backed by a signal plate 15, a collector electrode 24 which may be a conductive coating and electromagnetic focusing unit. The plate is scanned by high velocity electrons from a gun 20. Pulses e1 are applied to the control electrode 27 of a miniature cathoderay tube having a fluorescent screen 29 of short afterglow giving pulses of diffuse illuminations at the photo cathode during the frame flyback periods. Simultaneously pulses e2 are applied across resistance 30 to render the collector electrode 24 negative during these periods. Blanking pulses may be applied at the same time to the amplifier to avoid transient effects. All pulses may be derived from a pulse generator deriving its master pulses from the existing frame flyback pulses. Pulses el should have a sloping trailing end to compensate for the afterglow of the fluorescent screen 29. The signal taken from the plate 15 contain D.C. components giving the mean value of light level of the transmitted picture. In a modification, the area of the storage plate subjected to pulsed irradiation lies adjacent to but outside the picture area giving an indirect negative charging of the picture area which does not completely remove the residual charge pattern of the previous scan. To this end the photo cathode is masked and a number of fluorescent tubes are mounted round an opaque funnel surrounding the lens system 18. In another method the frame flyback period is divided into two intervals. In the first, the pulsed negative charging process is applied and in the second larger interval the storage surface is allowed to build up a video charge pattern. A positive pulse may be applied to collector 24 to accelerate the charge storage. In a modification (Fig. 3) employing electron multiplication for output, a fine mesh screen 50 is placed close to the target 14b and a secondary emitting ring 51 with a mesh electrode 52 functions as the collector. The screen 50 is connected to earth and the signal plate. Simultaneously with the application of pulses el to the light source 25b, pulses e3 raise the signal plate to the potential of collector 51 and the potential on the mesh 50 drives the emitted electrons back to the storage plate. During the scanning period, the emitted secondary electrons are drawn through meshes 50, 52, and release secondaries from surface 51 which are collected at 52 giving amplified signal. The intermittent light source may be a gas discharge tube or other light source obturated by rotating or vibrating shutters to give light pulses. Irradiating pulses may also be obtained from an additional electron gun.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB444749A GB687270A (en) | 1949-02-18 | 1949-02-18 | Apparatus incorporating a video storage tube and method of operating same |
GB10538/49A GB697722A (en) | 1949-02-18 | 1949-04-20 | Apparatus incorporating a video storage tube, and method of operating same |
FR1013760D FR1013760A (en) | 1949-02-18 | 1950-02-16 | Apparatus comprising an image storage tube and its mode of operation |
CH298709D CH298709A (en) | 1949-02-18 | 1950-02-16 | Method for obtaining a television signal using an image storage tube and device for implementing this method. |
DEC534A DE895910C (en) | 1949-02-18 | 1950-02-18 | Arrangement for television tubes |
CH322545D CH322545A (en) | 1949-02-18 | 1950-04-17 | Method for obtaining a television signal using an image storage tube and device for implementing this method |
DEC830A DE900828C (en) | 1949-02-18 | 1950-04-19 | Arrangement for the television broadcast of films |
US160636A US2651674A (en) | 1949-02-18 | 1950-05-08 | Television transmission from intermittent film by means of pulsed pickup tube |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB444749A GB687270A (en) | 1949-02-18 | 1949-02-18 | Apparatus incorporating a video storage tube and method of operating same |
GB10538/49A GB697722A (en) | 1949-02-18 | 1949-04-20 | Apparatus incorporating a video storage tube, and method of operating same |
GB1754849 | 1949-07-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB687270A true GB687270A (en) | 1953-02-11 |
Family
ID=41129318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB444749A Expired GB687270A (en) | 1949-02-18 | 1949-02-18 | Apparatus incorporating a video storage tube and method of operating same |
Country Status (4)
Country | Link |
---|---|
CH (1) | CH298709A (en) |
DE (1) | DE895910C (en) |
FR (1) | FR1013760A (en) |
GB (1) | GB687270A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB722907A (en) * | 1951-10-11 | 1955-02-02 | Pye Ltd | Improvements in or relating to television pick-up tubes, and television apparatus incorporating the same |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB335995A (en) * | 1929-06-04 | 1930-10-06 | Francois Charles Pierre Henrot | Improvements in or relating to television |
FR837648A (en) * | 1937-10-28 | 1939-02-15 | Thomson Houston Comp Francaise | Improvements to exploratory tubes intended for television |
FR847677A (en) * | 1937-12-18 | 1939-10-13 | Fernseh Ag | Method of implementing television transmission tubes with accumulation |
-
1949
- 1949-02-18 GB GB444749A patent/GB687270A/en not_active Expired
-
1950
- 1950-02-16 CH CH298709D patent/CH298709A/en unknown
- 1950-02-16 FR FR1013760D patent/FR1013760A/en not_active Expired
- 1950-02-18 DE DEC534A patent/DE895910C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE895910C (en) | 1953-11-12 |
FR1013760A (en) | 1952-08-04 |
CH298709A (en) | 1954-05-15 |
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