GB469079A - Improvements in or relating to electron discharge devices comprising photo-electrically-active electrodes - Google Patents
Improvements in or relating to electron discharge devices comprising photo-electrically-active electrodesInfo
- Publication number
- GB469079A GB469079A GB1350/36A GB135036A GB469079A GB 469079 A GB469079 A GB 469079A GB 1350/36 A GB1350/36 A GB 1350/36A GB 135036 A GB135036 A GB 135036A GB 469079 A GB469079 A GB 469079A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shield
- photo
- cathode
- screen
- silver
- 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
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/36—Photoelectric screens; Charge-storage screens
- H01J29/38—Photoelectric screens; Charge-storage screens not using charge storage, e.g. photo-emissive screen, extended cathode
Landscapes
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
469,079. Cathode-ray tubes. LUBSZYNSKI, H. G., and FREEMAN, G. S. P. Jan. 15, 1936, No. 1350. [Class 39 (i)] In an image intensifier or other cathode ray tube having an electrode which is photo - sensitized, deposit of the photo-sensitive material such as caesium is prevented where it is undesired by providing a mica shield 8, Fig. 1, in close contact with the surface, as shown a luminescent screen 7; after the cathode 6 has been sensitized the shield is swung out of the way of the screen to enable the screen to be used normally. Where excess photo-electric material is to be absorbed after the sensitizing process, absorbent material such as aggregated silver on the back of a mosaic support 12, Fig. 2, is covered by a shield; after the sensitizing process this shield is swung away to uncover the silver and absorb the excess, the shield being wedged against the curved part of the envelope and held there. The aggregated silver may be fixed on the undersurface of the shield. The movement may be effected by manipulation of the envelope or by magnetic action on a piece of soft iron fixed to the shield. In a modification the absorbent material may be covered and then uncovered by a slotted disc 16, Fig. 4, pivoted on a centre 18 and provided with a piece of soft iron 20. The absorbent may be on a cup with a suitable cover. Specifications 353,555 and 406,507 are referred to.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1350/36A GB469079A (en) | 1936-01-15 | 1936-01-15 | Improvements in or relating to electron discharge devices comprising photo-electrically-active electrodes |
| US120642A US2149849A (en) | 1936-01-15 | 1937-01-15 | Electron discharge device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1350/36A GB469079A (en) | 1936-01-15 | 1936-01-15 | Improvements in or relating to electron discharge devices comprising photo-electrically-active electrodes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB469079A true GB469079A (en) | 1937-07-15 |
Family
ID=9720475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1350/36A Expired GB469079A (en) | 1936-01-15 | 1936-01-15 | Improvements in or relating to electron discharge devices comprising photo-electrically-active electrodes |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2149849A (en) |
| GB (1) | GB469079A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE739645C (en) * | 1939-03-22 | 1943-10-01 | Zeiss Ikon Ag | Process to avoid the oxidation of glow cathodes when treating photocathodes in the same electrical discharge vessel with oxygen |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2586304A (en) * | 1948-06-12 | 1952-02-19 | Westinghouse Electric Corp | Protection of phosphors from attack by alkali vapors |
| US2894163A (en) * | 1955-10-21 | 1959-07-07 | Itt | Electron discharge devices |
| US2983836A (en) * | 1955-12-20 | 1961-05-09 | Itt | Extended flood beam source for image tubes |
| US2945975A (en) * | 1957-05-03 | 1960-07-19 | Siemens Ag Albis | Image converter tube |
| US2899576A (en) * | 1958-02-26 | 1959-08-11 | Electron discharge i |
-
1936
- 1936-01-15 GB GB1350/36A patent/GB469079A/en not_active Expired
-
1937
- 1937-01-15 US US120642A patent/US2149849A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE739645C (en) * | 1939-03-22 | 1943-10-01 | Zeiss Ikon Ag | Process to avoid the oxidation of glow cathodes when treating photocathodes in the same electrical discharge vessel with oxygen |
Also Published As
| Publication number | Publication date |
|---|---|
| US2149849A (en) | 1939-03-07 |
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