GB500456A - Improvements in cathode ray tubes having fluorescent screens - Google Patents
Improvements in cathode ray tubes having fluorescent screensInfo
- Publication number
- GB500456A GB500456A GB3499737A GB3499737A GB500456A GB 500456 A GB500456 A GB 500456A GB 3499737 A GB3499737 A GB 3499737A GB 3499737 A GB3499737 A GB 3499737A GB 500456 A GB500456 A GB 500456A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- anode
- ray tubes
- valve
- voltage
- 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
- H01J31/14—Magic-eye or analogous tuning indicators
-
- 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
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
500,456. Cathode - ray tubes thermionic valves; wireless receiving circuits. GENERAL ELECTRIC CO., Ltd., BENJAMIN, M., and BALLANTINE, R. J. Dec. 17, 1937, Nos. 34997/37 and 419/38. [Classes 39 (i) and 40 (v)] In a tuning indicator for radio receiving apparatus having a luminescent screen 1 whose illumination is varied by a control electrode 5 connected to the anode 4 of a valve in the set, the bias applied to the screen is alternating preferably of 50 cycles per second ; a resistance connection 6 is provided between the screen and anode 6. The valve is a pentode with screen and suppressor grids 8, 9 so that over some considerable range of anode voltage, the anode current varies substantially linearly with that voltage. The luminescent material may be willemite with an admixture or backing of carbon as described in Specification 600,314. Specification 466,604 also is referred to:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3499737A GB500456A (en) | 1937-12-17 | 1937-12-17 | Improvements in cathode ray tubes having fluorescent screens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3499737A GB500456A (en) | 1937-12-17 | 1937-12-17 | Improvements in cathode ray tubes having fluorescent screens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB500456A true GB500456A (en) | 1939-02-09 |
Family
ID=10372584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3499737A Expired GB500456A (en) | 1937-12-17 | 1937-12-17 | Improvements in cathode ray tubes having fluorescent screens |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB500456A (en) |
-
1937
- 1937-12-17 GB GB3499737A patent/GB500456A/en not_active Expired
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