GB686846A - Improvements in or relating to electron-optical image-converter tubes - Google Patents
Improvements in or relating to electron-optical image-converter tubesInfo
- Publication number
- GB686846A GB686846A GB5449/50A GB544950A GB686846A GB 686846 A GB686846 A GB 686846A GB 5449/50 A GB5449/50 A GB 5449/50A GB 544950 A GB544950 A GB 544950A GB 686846 A GB686846 A GB 686846A
- Authority
- GB
- United Kingdom
- Prior art keywords
- anode
- cathode
- cap
- spherical
- thin
- 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
- 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
- H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
Landscapes
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
686,846. Cathode-ray tubes. PHILIPS ELECTRICAL INDUSTRIES, Ltd. March 3, 1950 [March 7, 1949], No. 5449/50. Class 39(i) An electron optical image converter tube has an apertured spherical anode cap and a concave photoelectric cathode bordered by contiguous with and electrically connected to a conductive zone also concave to the anode, the radius of the cap being not greater than the difference between the radius of the cathode and the shortest distance between anode and cathode. The spherical part 2 of a glass vessel 1 is coated internally with a thin translucent conductive coating 3, e.g. of silver, obtained by sputtering or electric deposition and connected externally through a vacuum tight seal. On this layer is formed a photo-electric cathode 5 comprising a mixture of silver and caesium oxide particles on which a thin layer of caesium is absorbed. At the other end of the vessel 1 is a reentrant part 6 closed by a flat plate 7 carrying a fluorescent screen 8 or a thin transparent conductive layer connected by metallisation to the anode. A cylindrical metal tube 9 with an apertured spherical cap 10 comprises the anode, the aperture in the cap having a constant section over a distance equal to its diameter. The ratio of the curvatures of anode and photo-cathode should not exceed 1:4. When the electrodes are not truly concentric, the shape of the conductive wall 3 is varied or the distance between the electrodes adjusted to allow reproduction of the same size of surface.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL145253 | 1949-03-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB686846A true GB686846A (en) | 1953-02-04 |
Family
ID=19750469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5449/50A Expired GB686846A (en) | 1949-03-07 | 1950-03-03 | Improvements in or relating to electron-optical image-converter tubes |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US2692341A (en) |
| BE (1) | BE494327A (en) |
| CH (1) | CH281881A (en) |
| DE (1) | DE815069C (en) |
| FR (1) | FR1013859A (en) |
| GB (1) | GB686846A (en) |
| NL (1) | NL75366C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3021834A (en) * | 1954-03-11 | 1962-02-20 | Sheldon Edward Emanuel | Endoscopes |
| US2818520A (en) * | 1954-12-30 | 1957-12-31 | Rca Corp | Photocathode for a multiplier tube |
| US2946895A (en) * | 1957-04-01 | 1960-07-26 | Rca Corp | Image tube |
| US4173727A (en) * | 1966-06-23 | 1979-11-06 | Westinghouse Electric Corp. | Electron image device |
| DE9101775U1 (en) * | 1991-02-15 | 1991-05-08 | Siemens AG, 8000 München | Ceiling floodlights |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB499661A (en) * | 1936-07-30 | 1939-01-26 | Fernseh Ag | Improvements in or relating to light sensitive electron discharge devices |
| US2179083A (en) * | 1936-08-08 | 1939-11-07 | Aeg | Electron image tube |
| US2189321A (en) * | 1936-10-28 | 1940-02-06 | Rca Corp | Electro-optical device |
| US2306881A (en) * | 1938-12-15 | 1942-12-29 | Heimann Walter | Cathode ray tube |
-
0
- NL NL75366D patent/NL75366C/xx active
- BE BE494327D patent/BE494327A/xx unknown
-
1950
- 1950-02-24 US US146052A patent/US2692341A/en not_active Expired - Lifetime
- 1950-03-03 GB GB5449/50A patent/GB686846A/en not_active Expired
- 1950-03-04 DE DEN579A patent/DE815069C/en not_active Expired
- 1950-03-06 CH CH281881D patent/CH281881A/en unknown
- 1950-03-06 FR FR1013859D patent/FR1013859A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE815069C (en) | 1951-09-27 |
| US2692341A (en) | 1954-10-19 |
| CH281881A (en) | 1952-03-31 |
| BE494327A (en) | |
| NL75366C (en) | |
| FR1013859A (en) | 1952-08-05 |
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