GB687940A - Improvements in or relating to television pick-up tubes - Google Patents
Improvements in or relating to television pick-up tubesInfo
- Publication number
- GB687940A GB687940A GB2953049A GB2953049A GB687940A GB 687940 A GB687940 A GB 687940A GB 2953049 A GB2953049 A GB 2953049A GB 2953049 A GB2953049 A GB 2953049A GB 687940 A GB687940 A GB 687940A
- Authority
- GB
- United Kingdom
- Prior art keywords
- storage surface
- electrons
- cathode
- storage
- electrode
- 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
Landscapes
- Facsimile Scanning Arrangements (AREA)
Abstract
687,940. Cathode-ray tubes. TOWNSEND, F. H., and CATHODEON, Ltd. Nov. 9, 1950 [Nov. 18, 1949], No. 29530/49. Class 39(i) In a television pick-up tube of the high velocity scanned type having a charge storage surface capable of storing energy in the form of a charge pattern corresponding to the light distribution in an optical image, a thermionic source of electrons for emitting electrons towards the storage surface, and means for accelerating the emitted electrons towards the storage surface so as to charge the storage surface negatively, the thermionic source comprises a plurality of thermionic cathodes arranged around and in front of the storage surface, means being provided for individually adjusting the electron emission from the respective cathode, whereby the concentration of electrons directed upon different parts of the storage surface may be adjusted to obtain a predetermined selective negative charging of different parts of the storage surface. As shown the pick-up tube comprises an evacuated envelope containing a semitransparent photo-cathode 2 and a storage target spaced therefrom consisting of a mica sheet 3, which may be coated with a material to make it highly secondary emissive, backed with a conductive layer 4 forming the signal plate. Photoelectrons released from the photo-cathode 2 by an optical image projected thereon are accelerated towards the storage surface 3 by the wall coating 7 which is at a positive potential and are focused upon the storage surface by the focusing coil 8. The storage surface is scanned by a high velocity beam from the electron gun 6, and a collector electrode 9; which may be a wall coating, collects secondary electrons released from the storage surface 3. Four thermionic cathodes 10 are disposed around the area defined by the storage surface 3, being spaced in front thereof and so positioned that they do not interfere with the formation of the electron image on the surface 3, nor with the scanning by the cathode-ray beam. The collector electrode 9 is maintained positive with respect to the cathodes 10 and directs and accelerates the electrons released therefrom towards the storage surface with such velocities that the surface is negatively charged, a grid electrode 12, maintained at a positive potential also controlling the acceleration. Alternatively the electrode 9 may be omitted and its function performed by the electrode 12. The emission from the--cathode 10 is individually adjusted to obtain the desired negative charging on the storage surface. In the case of an iconoscope the electrons would irradiate the photo-sensitive mosaic target instead of the secondary emitting target of the image iconoscope.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2953049A GB687940A (en) | 1949-11-18 | 1949-11-18 | Improvements in or relating to television pick-up tubes |
FR1027731D FR1027731A (en) | 1949-11-18 | 1950-11-16 | Improvement in television program tubes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2953049A GB687940A (en) | 1949-11-18 | 1949-11-18 | Improvements in or relating to television pick-up tubes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB687940A true GB687940A (en) | 1953-02-25 |
Family
ID=10292990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2953049A Expired GB687940A (en) | 1949-11-18 | 1949-11-18 | Improvements in or relating to television pick-up tubes |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR1027731A (en) |
GB (1) | GB687940A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2748312A (en) * | 1954-11-19 | 1956-05-29 | Hughes Aircraft Co | Cathode-ray storage tube system |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112630288B (en) * | 2020-11-17 | 2021-10-12 | 燕山大学 | Secondary electron emission coefficient measuring device and method based on discharge |
-
1949
- 1949-11-18 GB GB2953049A patent/GB687940A/en not_active Expired
-
1950
- 1950-11-16 FR FR1027731D patent/FR1027731A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2748312A (en) * | 1954-11-19 | 1956-05-29 | Hughes Aircraft Co | Cathode-ray storage tube system |
Also Published As
Publication number | Publication date |
---|---|
FR1027731A (en) | 1953-05-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2454652A (en) | Cathode-ray storage tube | |
US2622226A (en) | Television pickup tube | |
US2452619A (en) | Cathode-ray tube | |
US2776387A (en) | Pick-up tube with induced conductivity target | |
US2555091A (en) | Cathode-ray tube | |
US2462569A (en) | Television receiving tube with storage properties | |
US2928969A (en) | Image device | |
GB740442A (en) | Improvements in or relating to television apparatus | |
US2819380A (en) | Method and apparatus for making apertured masks | |
US2837689A (en) | Post acceleration grid devices | |
US2339662A (en) | Television transmitter | |
GB687940A (en) | Improvements in or relating to television pick-up tubes | |
GB636250A (en) | Improvements in or relating to television and like pick-up tubes | |
US3189781A (en) | Image tube utilizing transmissive dynode-type target | |
US2558647A (en) | Storage electrode type cathode-ray tube | |
US2824259A (en) | Virtual flood-electron source | |
US3302054A (en) | Direct viewing storage tube having inclined flood gun and virtual cathode | |
US5639330A (en) | Method of making an image display element | |
GB475047A (en) | Improvements in or relating to electron discharge devices | |
US2520240A (en) | Cathode-ray tube | |
US2227092A (en) | Cathode ray tube | |
GB653835A (en) | Cathode arrangement for television tubes | |
US2992346A (en) | Light translating device | |
US2805359A (en) | Television pick-up tubes and television apparatus incorporating the same | |
GB710091A (en) | Improvements in or relating to television pick-up tubes, and television transmittingapparatus incorporating the same |