JPS6423236A - Automatic aperture control device - Google Patents

Automatic aperture control device

Info

Publication number
JPS6423236A
JPS6423236A JP62179466A JP17946687A JPS6423236A JP S6423236 A JPS6423236 A JP S6423236A JP 62179466 A JP62179466 A JP 62179466A JP 17946687 A JP17946687 A JP 17946687A JP S6423236 A JPS6423236 A JP S6423236A
Authority
JP
Japan
Prior art keywords
coil
circuit
aperture
set value
counter electromotive
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
JP62179466A
Other languages
Japanese (ja)
Inventor
Shuichi Horiguchi
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 JP62179466A priority Critical patent/JPS6423236A/en
Publication of JPS6423236A publication Critical patent/JPS6423236A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To normally actuate a device when external oscillation occurs by providing a limiter circuit which detects the rotating velocity of an aperture and makes a counter electromotive voltage generated in a damping coil not exceed a set value in the feedback circuit of the damping coil system. CONSTITUTION:When an exposure value detected in a video signal process circuit 4 is larger than the set value by comparing the exposure with the set value, a driving circuit 1 drives a driving coil 2 to close the aperture 3. When the external oscillation occurs, the driving circuit 1 and the driving coil 2 are operated so that the rotating velocity of the aperture 3 becomes zero by the damping coil 5. And when the counter electromotive voltage generated in the coil 5 exceeds + or -50mV, the limiter circuit 6 is operated so as to limit the counter electromotive voltage. Then, the device can be normally actuated without oscillated even if the external oscillation is given.
JP62179466A 1987-07-17 1987-07-17 Automatic aperture control device Pending JPS6423236A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62179466A JPS6423236A (en) 1987-07-17 1987-07-17 Automatic aperture control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62179466A JPS6423236A (en) 1987-07-17 1987-07-17 Automatic aperture control device

Publications (1)

Publication Number Publication Date
JPS6423236A true JPS6423236A (en) 1989-01-25

Family

ID=16066343

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62179466A Pending JPS6423236A (en) 1987-07-17 1987-07-17 Automatic aperture control device

Country Status (1)

Country Link
JP (1) JPS6423236A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04343110A (en) * 1991-05-20 1992-11-30 Sharp Corp Iris control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04343110A (en) * 1991-05-20 1992-11-30 Sharp Corp Iris control circuit

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