JPS5548738A - Exposure control system of partially opening shutter - Google Patents
Exposure control system of partially opening shutterInfo
- Publication number
- JPS5548738A JPS5548738A JP12174078A JP12174078A JPS5548738A JP S5548738 A JPS5548738 A JP S5548738A JP 12174078 A JP12174078 A JP 12174078A JP 12174078 A JP12174078 A JP 12174078A JP S5548738 A JPS5548738 A JP S5548738A
- Authority
- JP
- Japan
- Prior art keywords
- shutter
- luminance
- fully opened
- auxiliary diaphragm
- exposure control
- 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
Abstract
PURPOSE: To make it possible that exposure errors which are caused when luminance of a subject is low, can be dissolved and accuracy of exposure control can be improved in a wide range from high luminance to low luminance, by reducing the quantity of light projected to the photo detector from the auxiliary diaphragm after the shutter is fully opened.
CONSTITUTION: When the luminance of subject is relatively high, the received amount of light at auxiliary diaphragm light receiving device 23 reaches a required amount before the shutter is fully opened, the current to coil 5 is reversed by the shutter control citcuit, bobbin 4 is suddenly lowered, and the shutter is closed. When the luminance of subject is low, one end of L-shaped lever 11 contacts with switch 16 when the shutter is fully opened, and switch 16 is turned on. Then electromagnet 24 is turned on and filter 26 is inserted on the optical axis to auxiliary diaphragm photo detector 23. Since this time, shutter apertures 19 and 20 and auxiliary diaphragm apertures 21 and 22 are all in a fully opened condition, and, when received amount of light at photo detector 23 reaches a required amount, the shutter is closed. Thus exposure control can be made accurately.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12174078A JPS5548738A (en) | 1978-10-03 | 1978-10-03 | Exposure control system of partially opening shutter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12174078A JPS5548738A (en) | 1978-10-03 | 1978-10-03 | Exposure control system of partially opening shutter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5548738A true JPS5548738A (en) | 1980-04-08 |
Family
ID=14818699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12174078A Pending JPS5548738A (en) | 1978-10-03 | 1978-10-03 | Exposure control system of partially opening shutter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5548738A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5680030A (en) * | 1979-12-04 | 1981-07-01 | Copal Co Ltd | Programmed shutter interlocking to light receiving part |
| JPS57163222A (en) * | 1981-04-30 | 1982-10-07 | Copal Co Ltd | Trigger circuit of electric shutter circuit for camera |
| CN100349061C (en) * | 2001-07-09 | 2007-11-14 | 富士胶片株式会社 | Camera device with flasher |
-
1978
- 1978-10-03 JP JP12174078A patent/JPS5548738A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5680030A (en) * | 1979-12-04 | 1981-07-01 | Copal Co Ltd | Programmed shutter interlocking to light receiving part |
| JPS57163222A (en) * | 1981-04-30 | 1982-10-07 | Copal Co Ltd | Trigger circuit of electric shutter circuit for camera |
| CN100349061C (en) * | 2001-07-09 | 2007-11-14 | 富士胶片株式会社 | Camera device with flasher |
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