GB465715A - Improvements in or relating to cathode ray tube picture transmitters - Google Patents
Improvements in or relating to cathode ray tube picture transmittersInfo
- Publication number
- GB465715A GB465715A GB27032/36A GB2703236A GB465715A GB 465715 A GB465715 A GB 465715A GB 27032/36 A GB27032/36 A GB 27032/36A GB 2703236 A GB2703236 A GB 2703236A GB 465715 A GB465715 A GB 465715A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ray
- picture
- cathode
- secondary emission
- oct
- 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
- H01J29/36—Photoelectric screens; Charge-storage screens
- H01J29/39—Charge-storage screens
- H01J29/41—Charge-storage screens using secondary emission, e.g. for supericonoscope
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Abstract
465,715. Cathode-ray tubes. TELEFUNKEN GES. FUR DRAHTLOSE TELEGRAPHIE. Oct. 5, 1936, No. 27032. Convention date, Oct. 3, 1935. [Class 39 (i)] To develop electrical signals from a still picture, the picture is applied in chequer or dotted form to a screen scanned by a cathode-ray so that the secondary emission obtained from each element of the picture under bombardment by the ray depends on the tone value of the picture at the element and develops signals representative of half-tones of the picture. The screen 15, Fig. 1, scanned by the cathode-ray may have conical recesses X, Fig. 3, of depth corresponding to the local tone values of the picture, the secondary emission varying with the angle of incidence of the ray on the sides of the depression. The secondary emission flows to an anode 14 surrounding the cathode-ray and formed by a coating on the wall of the tube. The signals appear across the resistance 17. In modifications, depressions corresponding in area or number to the tone values are filled with carbon or other material having a different secondary emission from that of the aluminium plate 15.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE465715X | 1935-10-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB465715A true GB465715A (en) | 1937-05-13 |
Family
ID=6540436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27032/36A Expired GB465715A (en) | 1935-10-03 | 1936-10-05 | Improvements in or relating to cathode ray tube picture transmitters |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2156435A (en) |
| GB (1) | GB465715A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2637002A (en) * | 1953-04-28 | Television pickup tube | ||
| US2564277A (en) * | 1946-05-07 | 1951-08-14 | Csf | Velocity modulation device using secondary emission for density modulation of an electronic beam |
| US2540635A (en) * | 1948-05-27 | 1951-02-06 | Rca Corp | Cesiated monoscope |
| US2711289A (en) * | 1951-02-01 | 1955-06-21 | Rca Corp | Electronic simulator |
| US2761089A (en) * | 1952-01-03 | 1956-08-28 | Hughes Aircraft Co | Half-tone storage tubes |
| US2834910A (en) * | 1955-02-28 | 1958-05-13 | Nat Union Electric Corp | Variable transconductance amplifier, modulator tube |
| BE548321A (en) * | 1955-07-01 | |||
| US3276008A (en) * | 1963-08-08 | 1966-09-27 | Dick Co Ab | Character alignment and proportional spacing system |
-
1936
- 1936-10-05 GB GB27032/36A patent/GB465715A/en not_active Expired
- 1936-10-19 US US106301A patent/US2156435A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2156435A (en) | 1939-05-02 |
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