JPS5552034A - Aperture control system for camera - Google Patents
Aperture control system for cameraInfo
- Publication number
- JPS5552034A JPS5552034A JP12436378A JP12436378A JPS5552034A JP S5552034 A JPS5552034 A JP S5552034A JP 12436378 A JP12436378 A JP 12436378A JP 12436378 A JP12436378 A JP 12436378A JP S5552034 A JPS5552034 A JP S5552034A
- Authority
- JP
- Japan
- Prior art keywords
- reference level
- signals
- iris
- luminance side
- differential amplifier
- 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.)
- Granted
Links
Landscapes
- Exposure Control For Cameras (AREA)
Abstract
PURPOSE: To provide correct iris even in the case of rear light by providing integrating circuits, etc., comparing the respective integrated quantities of the signals having exceeded the reference level on the high luminance side and the signals below the reference level on the low luminance side and so controlling the iris that they assume the specified ratios.
CONSTITUTION: The first reference level l1 is set on the high luminance side and the second reference level l2 on the low luminance side. The first comparator 9 inputs the signal to an integrating circuit 14 when it exceeds the first reference level l1 and sends the signals below the second reference level l2 to an integrating circuit 18. The output signals of the integrating circuits 14, 18 are inputted to a differential amplifier 22, where the magnitude relations are compared. From the differential amplifier 22, the signals corresonding to said magnitude relation is outputted and by this signal the rotating direction of a motor 7 driving an iris 6 is determined. When the two input signals of the differential amplifier 22 become equal, the motor 7 stops, whereby the correct iris may be obtained. Hence, even in the case of rear light, correct brightness may be obtained.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12436378A JPS5552034A (en) | 1978-10-09 | 1978-10-09 | Aperture control system for camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12436378A JPS5552034A (en) | 1978-10-09 | 1978-10-09 | Aperture control system for camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5552034A true JPS5552034A (en) | 1980-04-16 |
| JPH0146856B2 JPH0146856B2 (en) | 1989-10-11 |
Family
ID=14883539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12436378A Granted JPS5552034A (en) | 1978-10-09 | 1978-10-09 | Aperture control system for camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5552034A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5899069A (en) * | 1981-12-08 | 1983-06-13 | Sankusu:Kk | Signal processor for image sensor |
| JP2002158894A (en) * | 2000-11-16 | 2002-05-31 | Sharp Corp | Dynamic gamma correction device |
| KR100495415B1 (en) * | 1999-12-30 | 2005-06-14 | 매그나칩 반도체 유한회사 | Auto exposure apparatus in image sensor |
-
1978
- 1978-10-09 JP JP12436378A patent/JPS5552034A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5899069A (en) * | 1981-12-08 | 1983-06-13 | Sankusu:Kk | Signal processor for image sensor |
| JPH0546144B2 (en) * | 1981-12-08 | 1993-07-13 | Sunx Ltd | |
| KR100495415B1 (en) * | 1999-12-30 | 2005-06-14 | 매그나칩 반도체 유한회사 | Auto exposure apparatus in image sensor |
| JP2002158894A (en) * | 2000-11-16 | 2002-05-31 | Sharp Corp | Dynamic gamma correction device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0146856B2 (en) | 1989-10-11 |
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