GB493543A - Improvements in or relating to ikonoscopes, television cathode ray tubes and the like - Google Patents
Improvements in or relating to ikonoscopes, television cathode ray tubes and the likeInfo
- Publication number
- GB493543A GB493543A GB624/37A GB62437A GB493543A GB 493543 A GB493543 A GB 493543A GB 624/37 A GB624/37 A GB 624/37A GB 62437 A GB62437 A GB 62437A GB 493543 A GB493543 A GB 493543A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- electrode
- ray
- cathode
- net
- 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
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/80—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
493,543. Cathode-ray tubes. RADIOAKT.-GES. D. S. LOEWE. Jan. 8, 1937, No. 624. Convention date, Jan. 11, 1936. [Class 39 (i)] In a cathode-ray tube containing screening or accelerating electrodes made of wire net, thin electrodes are prevented from casting an objectionable shadow on the screen either by placing them at the place where the ray has the greatest practicable breadth, i.e. as close to the electron lens as the deflecting electrodes will permit, or by so choosing their potential and by making them of such material that the secondary electrons emitted just compensate for the electrons absorbed. The Figure shows the invention applied to a tube in which a mosaic screen 5, on which an optical image is projected as described in Specification 489,362, is scanned by a cathode-ray, an aperture in a diaphragm 2 being focused on the screen 5 by means of an electron lens formed of the tube 3 and diaphragm 4. Arranged as close as possible to the deflecting plates 8, 9, is a wire net electrode 6a, the potential of which with respect to the electrode 4 can be adjusted. This electrode may, in addition to acting as a screen electrode, serve to collect secondary electrons emitted from the screen 5. An accelerating electrode 6b at a positive potential of 8000 volts relative to the screen 6a may also be provided. Alternatively a net 6c may be arranged near the screen 5 and made of such material, e.g. tungsten, that the secondary emission from it compensates for the electrons absorbing by it. In a modification the net is arranged across the end of a cylinder.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE493543X | 1936-01-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB493543A true GB493543A (en) | 1938-10-10 |
Family
ID=6544576
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB624/37A Expired GB493543A (en) | 1936-01-11 | 1937-01-08 | Improvements in or relating to ikonoscopes, television cathode ray tubes and the like |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR816189A (en) |
GB (1) | GB493543A (en) |
-
1937
- 1937-01-08 GB GB624/37A patent/GB493543A/en not_active Expired
- 1937-01-09 FR FR816189D patent/FR816189A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR816189A (en) | 1937-08-02 |
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