Method of and apparatus for controlling amount of electron beam in image pickup tube
US3975657A · kind A · utility
9Cited by
6References
16Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Mar 7, 1974 |
| Grant date | Aug 17, 1976 |
| Priority date | — |
| Expiry date | Mar 7, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/749
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of and an apparatus for controlling the amount of the electron beam in a photoconduction type image pickup tube in which the signal corresponding to the return beam from the photoelectric conversion plane is detected, the detected signal is compared with a reference signal and amplified, and the resulting signal is applied to the scanning electron beam current control electrode. By appropriately determining a plurality of circuit constants the return beam can be maintained approximately at a constant value independently of the amount of light incident upon the photoelectric conversion plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.