GB546519A - Improvements in cathode ray tubes of the television transmitting type - Google Patents
Improvements in cathode ray tubes of the television transmitting typeInfo
- Publication number
- GB546519A GB546519A GB6289/41A GB628941A GB546519A GB 546519 A GB546519 A GB 546519A GB 6289/41 A GB6289/41 A GB 6289/41A GB 628941 A GB628941 A GB 628941A GB 546519 A GB546519 A GB 546519A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- photo
- mosaic
- target
- scanning
- 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
- 238000000576 coating method Methods 0.000 abstract 3
- 239000011248 coating agent Substances 0.000 abstract 2
- 238000010894 electron beam technology Methods 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 abstract 1
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
- H01J31/26—Image pick-up tubes having an input of visible light and electric output
- H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
- H01J31/34—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at cathode potential, e.g. orthicon
- H01J31/36—Tubes with image amplification section, e.g. image-orthicon
Landscapes
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Abstract
546,519. Cathode-ray tubes. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. May 15, 1941, No. 6289. Convention date, May 15, 1940. [Class 39 (i)] A cathode-ray tube for television transmission comprises a mosaic target 18 on which an electrostatic image of the information to be transmitted is generated and which faces away from the source 9 of the scanning beam ; the target is offset from the normal path of the beam which is guided beyond and back to the target to neutralize the electrostatic image thereon. As shown, the target is positioned at the point where a cylindrical part 4 and a toroidal part 2 of the envelope join. A photo-cathode 5 is placed at the window 3 of the part 2 to receive the optical image of an object 6. The electron gun system 9 is placed at the free end of the cylindrical part 4. A magnetic coil 10 surrounds the envelope and extends over the whole space between the gun 9 and photo-cathode 5, and preferably slightly beyond. A main coating 20, and ring shaped coatings 21, 22 are formed on the inner wall of the toroidal portion of the envelope to form electrodes. Alternatively these may be replaced by fine wire mesh. The electron gun and the deflecting means comprising electrostatic plates 14 and magnetic coils 15 are as described in Specification 542,219. The signal plate 19 and the cathode 9 operate at zero potential, the potential of the photo-cathode 5 is negative and the coating 20 positive relatively to the cathode 9; the potential of the rings 21, 22 are intermediate the potentials of 5 and 20, and 9 and 20 respectively. With this arrangement, the electron image thrown on the mosaic by the photo-cathode is displaced laterally and sheared mto rhomboidal form as shown at 29, Fig. 3. The scanning electron beam after passing the mosaic is reflected and the scanning area is also displaced and sheared to coincide with the electrostatic image. The conditions necessary are that the velocity of the scanning beam when passing the mosaic is about “ the velocity of the electron beam from the photo-cathode. This ratio may be dispensed if the plan of one of the co-ordinate deflections of the scanning beam is made non- perpendicular to the other.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US335211A US2256462A (en) | 1940-05-15 | 1940-05-15 | Television transmitting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB546519A true GB546519A (en) | 1942-07-16 |
Family
ID=23310755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6289/41A Expired GB546519A (en) | 1940-05-15 | 1941-05-15 | Improvements in cathode ray tubes of the television transmitting type |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2256462A (en) |
| GB (1) | GB546519A (en) |
| NL (1) | NL60553C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2636999A (en) * | 1953-04-28 | x x x x i | ||
| US2506741A (en) * | 1940-09-20 | 1950-05-09 | Rca Corp | Television transmitting tube |
| FR959703A (en) * | 1941-07-08 | 1950-04-04 | ||
| US2544754A (en) * | 1947-12-04 | 1951-03-13 | Bell Telephone Labor Inc | Electron camera tube |
| US2544755A (en) * | 1948-01-29 | 1951-03-13 | Bell Telephone Labor Inc | Electron camera tube |
| US2926282A (en) * | 1950-03-03 | 1960-02-23 | Robert J Patch | Vacuum tube and electric signalling apparatus |
| US2760096A (en) * | 1952-01-29 | 1956-08-21 | Westinghouse Electric Corp | Television pickup tube |
-
0
- NL NL60553D patent/NL60553C/xx active
-
1940
- 1940-05-15 US US335211A patent/US2256462A/en not_active Expired - Lifetime
-
1941
- 1941-05-15 GB GB6289/41A patent/GB546519A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL60553C (en) | |
| US2256462A (en) | 1941-09-09 |
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