JPS55103530A - Exposure time control circuit of camera - Google Patents

Exposure time control circuit of camera

Info

Publication number
JPS55103530A
JPS55103530A JP1056679A JP1056679A JPS55103530A JP S55103530 A JPS55103530 A JP S55103530A JP 1056679 A JP1056679 A JP 1056679A JP 1056679 A JP1056679 A JP 1056679A JP S55103530 A JPS55103530 A JP S55103530A
Authority
JP
Japan
Prior art keywords
exposure time
output
circuit
converter
supplied
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
JP1056679A
Other languages
Japanese (ja)
Inventor
Hidekazu Tano
Koji Suzuki
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 JP1056679A priority Critical patent/JPS55103530A/en
Priority to US06/113,003 priority patent/US4306785A/en
Priority to GB8002465A priority patent/GB2045957B/en
Priority to GB8032779A priority patent/GB2059612B/en
Priority to FR8002208A priority patent/FR2448164A1/en
Priority to DE3003745A priority patent/DE3003745C2/en
Publication of JPS55103530A publication Critical patent/JPS55103530A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To set manual exposure time to digital quantity and achieve miniaturization with a simple constitution by changing over the automatic exposure time information having undergone photometric operation or the manual exposure time information having been manually set and supplying the same to an expansion time constant circuit.
CONSTITUTION: Automatic exposure time is operated 5 based on the logarithmic compression values such as of subject luminance, film sensitivity, aperture value and exposure magnification and the operated output and D/A converted 13 output are changed over 9 and supplied to an expansion time constant circuit 15. The output of a counter 7 and the output of a manual exposure time setting circuit 8 are changed over 10 and supplied to the D/A converter 13. In this case, the operated output is supplied to the circuit 15 and the counter output to the converter 13 at the automatic exposure time control and the output of the converter 13 is supplied to the circuit 15 and the output of the circuit 8 to the converter 13 at the manual exposure time control.
COPYRIGHT: (C)1980,JPO&Japio
JP1056679A 1979-02-01 1979-02-01 Exposure time control circuit of camera Pending JPS55103530A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP1056679A JPS55103530A (en) 1979-02-01 1979-02-01 Exposure time control circuit of camera
US06/113,003 US4306785A (en) 1979-02-01 1980-01-17 Camera exposure time control circuit
GB8002465A GB2045957B (en) 1979-02-01 1980-01-24 Camera shutter speed control and display
GB8032779A GB2059612B (en) 1979-02-01 1980-01-24 Shutter speed control for a camera
FR8002208A FR2448164A1 (en) 1979-02-01 1980-02-01 LAYING TIME ADJUSTMENT CIRCUIT FOR A CAMERA
DE3003745A DE3003745C2 (en) 1979-02-01 1980-02-01 Exposure time control circuit for a camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1056679A JPS55103530A (en) 1979-02-01 1979-02-01 Exposure time control circuit of camera

Publications (1)

Publication Number Publication Date
JPS55103530A true JPS55103530A (en) 1980-08-07

Family

ID=11753789

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1056679A Pending JPS55103530A (en) 1979-02-01 1979-02-01 Exposure time control circuit of camera

Country Status (1)

Country Link
JP (1) JPS55103530A (en)

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