JPS5557829A - Manual servo control unit of iris - Google Patents
Manual servo control unit of irisInfo
- 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
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
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)
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 |
-
1978
- 1978-10-25 JP JP13111578A patent/JPS5557829A/en active Pending
Cited By (2)
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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