JPS5576330A - Aperture control unit - Google Patents
Aperture control unitInfo
- Publication number
- JPS5576330A JPS5576330A JP14956278A JP14956278A JPS5576330A JP S5576330 A JPS5576330 A JP S5576330A JP 14956278 A JP14956278 A JP 14956278A JP 14956278 A JP14956278 A JP 14956278A JP S5576330 A JPS5576330 A JP S5576330A
- Authority
- JP
- Japan
- Prior art keywords
- aperture control
- manual
- switch
- stepping motor
- case
- 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)
- Diaphragms For Cameras (AREA)
Abstract
PURPOSE: To make possible automatic and manual controlling by changing the frequencies of the pulse signals driving a stepping motor depending upon the case of performing aperture control automatically according to the subject luminance and the case when it is done manually.
CONSTITUTION: At the time of performing automatic aperture control, a push of an operating member 10 causes the second switch SW2 to be held on the A, -A0 side and the fifth switch SW5 to be so set as to become OFF to the third switch SW3, whereby automatic aperture control is accomplished, and a stepping motor is driven by the relatively high pulse signals from the first pulse oscillator OSC1. In the case of manual aperture control, the manual aperture control may be performed by drawing out the operating member 10. At this time, the stepping motor is driven by the relatively low pulse signals from the second pulse signal oscillator OSC2 and therefore the driving speed becomes slower, whereby the aperture control at the manual control is made easy.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14956278A JPS5576330A (en) | 1978-12-01 | 1978-12-01 | Aperture control unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14956278A JPS5576330A (en) | 1978-12-01 | 1978-12-01 | Aperture control unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5576330A true JPS5576330A (en) | 1980-06-09 |
Family
ID=15477880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14956278A Pending JPS5576330A (en) | 1978-12-01 | 1978-12-01 | Aperture control unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5576330A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5640523U (en) * | 1979-09-03 | 1981-04-15 |
-
1978
- 1978-12-01 JP JP14956278A patent/JPS5576330A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5640523U (en) * | 1979-09-03 | 1981-04-15 | ||
JPS6139375Y2 (en) * | 1979-09-03 | 1986-11-12 |
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