JPS5573028A - Both internal and external light response pulse count type digital electric shutter operating only with correct light - Google Patents
Both internal and external light response pulse count type digital electric shutter operating only with correct lightInfo
- Publication number
- JPS5573028A JPS5573028A JP14526078A JP14526078A JPS5573028A JP S5573028 A JPS5573028 A JP S5573028A JP 14526078 A JP14526078 A JP 14526078A JP 14526078 A JP14526078 A JP 14526078A JP S5573028 A JPS5573028 A JP S5573028A
- Authority
- JP
- Japan
- Prior art keywords
- light
- external light
- internal
- signal
- light response
- 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 enable the shutter to adequately cope with the change in photographing light by counting the light response pulses of the frequencies corresponding to the respective intensity of external light and internal light for the specified time and generating the control signals differing according to the magnitude relations of both count values.
CONSTITUTION: When internal light is darker than external light, the count values of the respective light response pulses in counter 5, 6 becomes larger with the counter 5 and therefore the signal "1" outputs from the final count step earlier from the counter 5 owing to additional counting of reference pulses. This signal causes as SF-FF 94 to set and its set output signal S2 becomes "1" to close an inhibit circuit I6, causing a control signal to be outputted from an inhibit circuit I7. As a result of this, a transistor 105 goes ON to close a switch 107, then a motor M runs in the specified direction and repeats correction according to the time signal of a timer 3 so that the frequency of the external light response pulses decreases. When the frequencies of both light response pulses coincide, a lamp 73 goes on. In this way, the shutter may be coped with the change in the photographing light.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14526078A JPS5573028A (en) | 1978-11-27 | 1978-11-27 | Both internal and external light response pulse count type digital electric shutter operating only with correct light |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14526078A JPS5573028A (en) | 1978-11-27 | 1978-11-27 | Both internal and external light response pulse count type digital electric shutter operating only with correct light |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5573028A true JPS5573028A (en) | 1980-06-02 |
Family
ID=15381008
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14526078A Pending JPS5573028A (en) | 1978-11-27 | 1978-11-27 | Both internal and external light response pulse count type digital electric shutter operating only with correct light |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5573028A (en) |
-
1978
- 1978-11-27 JP JP14526078A patent/JPS5573028A/en active Pending
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