GB502104A - Improvements in or relating to electron discharge devices - Google Patents
Improvements in or relating to electron discharge devicesInfo
- Publication number
- GB502104A GB502104A GB2477737A GB2477737A GB502104A GB 502104 A GB502104 A GB 502104A GB 2477737 A GB2477737 A GB 2477737A GB 2477737 A GB2477737 A GB 2477737A GB 502104 A GB502104 A GB 502104A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- cathode
- velocity electrons
- low velocity
- relating
- 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
- H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
- H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
502,104. Cathode - ray tubes. KLEMPERER, O. Sept. 11, 1937, No. 24777. [Class 39 (i)] In cathode-ray tubes having a luminescent screen which tends to become negatively charged when bombarded by high velocity electrons of the order of 10-100 kilovolts, the building up of a negative charge on the screen is prevented by the provision of a source of low velocity electrons, of the order of 200-300 volts which is caused to impact the screen. An arrangement is shown in the drawing in which the screen 6 is bombarded by the high velocity electrons from a system including a cathode 2, modulating electrode 3 and first and second anodes 4, 5, the latter of which is at a voltage of about 20 kilovolts. A source of low velocity electrons comprises an anode 9 preferably at the potential of the anode 5 and a cathode 8 at about 300 volts negative thereto. The low velocity electrons may cover the whole area of the fluorescent screen and may be continuous or intermittent in action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2477737A GB502104A (en) | 1937-09-11 | 1937-09-11 | Improvements in or relating to electron discharge devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2477737A GB502104A (en) | 1937-09-11 | 1937-09-11 | Improvements in or relating to electron discharge devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB502104A true GB502104A (en) | 1939-03-13 |
Family
ID=10217092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2477737A Expired GB502104A (en) | 1937-09-11 | 1937-09-11 | Improvements in or relating to electron discharge devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB502104A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE871792C (en) * | 1939-04-30 | 1953-03-26 | Siemens Ag | Method for preventing the charging of insulating surfaces, in particular the fluorescent screen from Braunschen Roehren |
-
1937
- 1937-09-11 GB GB2477737A patent/GB502104A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE871792C (en) * | 1939-04-30 | 1953-03-26 | Siemens Ag | Method for preventing the charging of insulating surfaces, in particular the fluorescent screen from Braunschen Roehren |
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