JPS5587129A - Automatic aperture circuit of lens - Google Patents

Automatic aperture circuit of lens

Info

Publication number
JPS5587129A
JPS5587129A JP16566278A JP16566278A JPS5587129A JP S5587129 A JPS5587129 A JP S5587129A JP 16566278 A JP16566278 A JP 16566278A JP 16566278 A JP16566278 A JP 16566278A JP S5587129 A JPS5587129 A JP S5587129A
Authority
JP
Japan
Prior art keywords
circuit
image pickup
rear light
amplifier
lens
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
JP16566278A
Other languages
Japanese (ja)
Inventor
Yoshinori Kitamura
Masaaki Nakayama
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 JP16566278A priority Critical patent/JPS5587129A/en
Publication of JPS5587129A publication Critical patent/JPS5587129A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To enable the automatic controlling to correct aperture even at the image pickup of rear light by providing a circuit having non-linear characteristics according to input levels.
CONSTITUTION: A non-linear circuit 15 is provided between a pre-amplifier 8 and rectifier 4. Then, the signal of an image pickup tube 5 having been amplified by the pre-amplifier 8 is supplied to a non-linear circuit 15. The circuit 15 is turn so controls the signal as to compress only the level of the video signal corresponding to rear light, etc. Next, the output thereof is rectified by the rectifier 4 and so controls an iris 2 that the output of a differential amplifier 3 becomes of a reference potential. In this way, the over-stopping of the iris at the image pickup of rear light, etc. may be prevented and automatic control to optimum aperture accomplished.
COPYRIGHT: (C)1980,JPO&Japio
JP16566278A 1978-12-25 1978-12-25 Automatic aperture circuit of lens Pending JPS5587129A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16566278A JPS5587129A (en) 1978-12-25 1978-12-25 Automatic aperture circuit of lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16566278A JPS5587129A (en) 1978-12-25 1978-12-25 Automatic aperture circuit of lens

Publications (1)

Publication Number Publication Date
JPS5587129A true JPS5587129A (en) 1980-07-01

Family

ID=15816622

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16566278A Pending JPS5587129A (en) 1978-12-25 1978-12-25 Automatic aperture circuit of lens

Country Status (1)

Country Link
JP (1) JPS5587129A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5999880A (en) * 1982-11-29 1984-06-08 Canon Inc Image pickup device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5999880A (en) * 1982-11-29 1984-06-08 Canon Inc Image pickup device
JPH029511B2 (en) * 1982-11-29 1990-03-02 Canon Kk

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