JPS5466023A - Television camera - Google Patents

Television camera

Info

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
Application number
JP13294677A
Other languages
Japanese (ja)
Inventor
Ryuhei Nakabe
Omichi Tanaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP13294677A priority Critical patent/JPS5466023A/en
Publication of JPS5466023A publication Critical patent/JPS5466023A/en
Pending legal-status Critical Current

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
JP13294677A 1977-11-05 1977-11-05 Television camera Pending JPS5466023A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5871769A (en) * 1981-10-23 1983-04-28 Sony Corp Control circuit of reference level

Cited By (2)

* Cited by examiner, † Cited by third party
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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