GB651728A - Improvements in or relating to cathode-ray tubes - Google Patents
Improvements in or relating to cathode-ray tubesInfo
- Publication number
- GB651728A GB651728A GB34184/47A GB3418447A GB651728A GB 651728 A GB651728 A GB 651728A GB 34184/47 A GB34184/47 A GB 34184/47A GB 3418447 A GB3418447 A GB 3418447A GB 651728 A GB651728 A GB 651728A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- tube
- aluminium
- cathode
- mms
- 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
- H01J29/18—Luminescent screens
Landscapes
- Physical Vapour Deposition (AREA)
Abstract
651,728. Cathode-ray tubes. QUERVAIN, A. DE. Dec. 24, 1947, No. 34184. Convention date, Feb. 14, 1939. [Class 39 (i)] In a hard cathode-ray tube having a fluorescent screen which is liable to deterioration under bombardment by ions generated during operation, the screen is provided on its surface facing the beam with a metallic film, preferably of aluminium, which is of such thickness as to block the ions but allows the electrons to pass through to excite the screen. The fluorescent screen may be deposited on the end wall of the envelope in which case the aluminium can be vaporized on to it; alternatively the thin film can serve as a carrier for the fluorescent material which is deposited thereon. In a specific example of the former arrangement an aluminium layer of 0.056 microns in thickness is produced by evaporation from a filament arranged centrally in the tube at a pressure of 10<SP>-4</SP> mms., and is effective at a beam voltage of 5.5 kilovolts and a maximum beam current of 300 microamperes. The tube is finally evacuated to 10<SP>-6</SP> or 10<SP>-7</SP> mms. and will then operate 4-5 times longer without appreciable ion burn with magnetic focusing and deflection, or still longer than this with electrostatic focusing and magnetic deflection, as compared with a similar tube having no ion trap. The Specification as open to inspection under Sect. 91 refers in addition to cellulose layers and suggests that the layer need not be in contact with the screen. The screen may be a photographic film. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH651728X | 1939-02-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB651728A true GB651728A (en) | 1951-04-11 |
Family
ID=4526166
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB34184/47A Expired GB651728A (en) | 1939-02-14 | 1947-12-24 | Improvements in or relating to cathode-ray tubes |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB651728A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3350594A (en) * | 1963-08-02 | 1967-10-31 | Emi Ltd | Image intensifier having continuous conducting layer between porous metallic coating and luminescent layer |
-
1947
- 1947-12-24 GB GB34184/47A patent/GB651728A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3350594A (en) * | 1963-08-02 | 1967-10-31 | Emi Ltd | Image intensifier having continuous conducting layer between porous metallic coating and luminescent layer |
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