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 light

Info

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
Application number
JP14526078A
Other languages
Japanese (ja)
Inventor
Tsukumo Nobusawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP14526078A priority Critical patent/JPS5573028A/en
Publication of JPS5573028A publication Critical patent/JPS5573028A/en
Pending legal-status Critical Current

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
JP14526078A 1978-11-27 1978-11-27 Both internal and external light response pulse count type digital electric shutter operating only with correct light Pending JPS5573028A (en)

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)

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