JPS5557829A - Manual servo control unit of iris - Google Patents

Manual servo control unit of iris

Info

Publication number
JPS5557829A
JPS5557829A JP13111578A JP13111578A JPS5557829A JP S5557829 A JPS5557829 A JP S5557829A JP 13111578 A JP13111578 A JP 13111578A JP 13111578 A JP13111578 A JP 13111578A JP S5557829 A JPS5557829 A JP S5557829A
Authority
JP
Japan
Prior art keywords
iris
meter
detecting means
photo detecting
controlled
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
JP13111578A
Other languages
Japanese (ja)
Inventor
Makoto Oishi
Toshiyuki Yajima
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.)
Fujinon Corp
Original Assignee
Fuji Photo Optical 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 Fuji Photo Optical Co Ltd filed Critical Fuji Photo Optical Co Ltd
Priority to JP13111578A priority Critical patent/JPS5557829A/en
Publication of JPS5557829A publication Critical patent/JPS5557829A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To achieve the reduction in size and weight by servo controlling the iris with a meter and feeding the position of the iris back to a bridge circuit in the adsence of contact thereby performing servo controlling.
CONSTITUTION: This comprises controlling the luminous flux from a light emitting means 1 by te turning angle of a meter 6, varying the equivalent resistance of a photo detecting means 3 being one side of a bridge circuit, and letting a photo detecting means 3 and resistance R2 equivalently be a contactless potentiometer having no sliding terminals, wherein when a change-over switch SW is changed over to the manual side M and a potentiometer R5 is set at a suitable position, the meter 6 and iris 5 are turning-controlled and a filter means 2 is turning-controlled together, by which the equivalent resistance of the photo detecting means 3 is controlled and the iris 5 is controlled according to the set value of the potentiometer R5. At this time, the value of the iris 5 is feed back in the absence of any contact to the photo detecting means 3 by way of the filter means 2 and the load of the meter 6 becomes only the mechanical sliding load of the iris 5.
COPYRIGHT: (C)1980,JPO&Japio
JP13111578A 1978-10-25 1978-10-25 Manual servo control unit of iris Pending JPS5557829A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13111578A JPS5557829A (en) 1978-10-25 1978-10-25 Manual servo control unit of iris

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13111578A JPS5557829A (en) 1978-10-25 1978-10-25 Manual servo control unit of iris

Publications (1)

Publication Number Publication Date
JPS5557829A true JPS5557829A (en) 1980-04-30

Family

ID=15050327

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13111578A Pending JPS5557829A (en) 1978-10-25 1978-10-25 Manual servo control unit of iris

Country Status (1)

Country Link
JP (1) JPS5557829A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5817427A (en) * 1981-07-24 1983-02-01 Copal Co Ltd Electro-chromic element diaphragm
JPS60107627A (en) * 1983-11-16 1985-06-13 Arai Seimitsu Kk Aperture controller of lens for camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5817427A (en) * 1981-07-24 1983-02-01 Copal Co Ltd Electro-chromic element diaphragm
JPS60107627A (en) * 1983-11-16 1985-06-13 Arai Seimitsu Kk Aperture controller of lens for camera

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