JPS5466023A - Television camera - Google Patents
Television cameraInfo
- Publication number
- JPS5466023A JPS5466023A JP13294677A JP13294677A JPS5466023A JP S5466023 A JPS5466023 A JP S5466023A JP 13294677 A JP13294677 A JP 13294677A JP 13294677 A JP13294677 A JP 13294677A JP S5466023 A JPS5466023 A JP S5466023A
- Authority
- JP
- Japan
- Prior art keywords
- optical black
- externally
- signal
- scanning
- level
- 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.)
- Pending
Links
Landscapes
- Picture Signal Circuits (AREA)
Abstract
PURPOSE: To reproduce pictures in accurate black constantly, by comparing signal outputs obtained by scanning built-in and externally-fitted optical black parts respectively, and by controlling the level of the signal output of the externally-fitted optical black part by feeding the obtained difference output back to a video amplifier.
CONSTITUTION: Built-in optical black part 202 and externally-fitted optical black part 204 are provided outside the screen scanning part of the pickup tube. Signal outputs 407 and 406 obtained by scanning both optical black parts are compared 408 each other, and a signal indicating this difference is fed back to video amplifier 403 via amplifier 409 so as to control the level of the signal output obtained from externally-fitted optical black part 204, so that clamping 403 of a luminance signal will be attained on the basis of this controlled level. Consequently, pictures can be reproduced in accurate black constantly.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13294677A JPS5466023A (en) | 1977-11-05 | 1977-11-05 | Television camera |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13294677A JPS5466023A (en) | 1977-11-05 | 1977-11-05 | Television camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5466023A true JPS5466023A (en) | 1979-05-28 |
Family
ID=15093183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13294677A Pending JPS5466023A (en) | 1977-11-05 | 1977-11-05 | Television camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5466023A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5871769A (en) * | 1981-10-23 | 1983-04-28 | Sony Corp | Control circuit of reference level |
-
1977
- 1977-11-05 JP JP13294677A patent/JPS5466023A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5871769A (en) * | 1981-10-23 | 1983-04-28 | Sony Corp | Control circuit of reference level |
JPH0374072B2 (en) * | 1981-10-23 | 1991-11-25 |
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