JPS5511238A - Aperture control unit of camera in flash photography - Google Patents
Aperture control unit of camera in flash photographyInfo
- Publication number
- JPS5511238A JPS5511238A JP8428578A JP8428578A JPS5511238A JP S5511238 A JPS5511238 A JP S5511238A JP 8428578 A JP8428578 A JP 8428578A JP 8428578 A JP8428578 A JP 8428578A JP S5511238 A JPS5511238 A JP S5511238A
- Authority
- JP
- Japan
- Prior art keywords
- aperture
- value
- light
- preliminary
- stopped
- 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 automatically determine aperture value in a maximum flash-photographable distance range by measuring the intensity of the reflected light of preliminarly emitted light which is of a fixed intensity and is continuous, and comparing this and a set value thereby determining the aperture.
CONSTITUTION: When stopping down of aperture is accomplished by depressing a shutter button, a switch 11 goes ON to apply the signal of a high level to a flash emission device 12 via resistance 10, thereby causing this to emit continuous light of relatively low luminance and constant luminous, i.e., to emit light preliminary. Since the light through the preliminary emission is reflected by the subject and enters a photometric element 1 by passing through a photographic lens L, the value of the voltage V6 at the point B gradually degreases as the aperture AP is stopped down. When it reaches the value having been set by a constant-voltage regulated power supply 6, the output of a comparator 7 is inverted. This output passes through AND 8 is applied to a magnet 9 to operate this, whereby the aperture AP is stopped in the opening value of that time.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8428578A JPS5511238A (en) | 1978-07-10 | 1978-07-10 | Aperture control unit of camera in flash photography |
US06/056,938 US4305647A (en) | 1978-07-10 | 1979-07-12 | Camera flash photography systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8428578A JPS5511238A (en) | 1978-07-10 | 1978-07-10 | Aperture control unit of camera in flash photography |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60151148A Division JPS61143730A (en) | 1985-07-09 | 1985-07-09 | Flash photographing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5511238A true JPS5511238A (en) | 1980-01-26 |
Family
ID=13826185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8428578A Pending JPS5511238A (en) | 1978-07-10 | 1978-07-10 | Aperture control unit of camera in flash photography |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5511238A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58120178U (en) * | 1982-02-05 | 1983-08-16 | 日立機電工業株式会社 | Crane hook automatic hooking device |
US4474451A (en) * | 1982-02-19 | 1984-10-02 | Olympus Optical Co., Ltd. | Diaphragm control circuit for TTL automatic electronic flash |
US4514074A (en) * | 1981-12-28 | 1985-04-30 | Olympus Optical Company Ltd. | Exposure control circuit for TTL automatic electronic flash |
-
1978
- 1978-07-10 JP JP8428578A patent/JPS5511238A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4514074A (en) * | 1981-12-28 | 1985-04-30 | Olympus Optical Company Ltd. | Exposure control circuit for TTL automatic electronic flash |
JPS58120178U (en) * | 1982-02-05 | 1983-08-16 | 日立機電工業株式会社 | Crane hook automatic hooking device |
US4474451A (en) * | 1982-02-19 | 1984-10-02 | Olympus Optical Co., Ltd. | Diaphragm control circuit for TTL automatic electronic flash |
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