JPS5536895A - Program shutter - Google Patents

Program shutter

Info

Publication number
JPS5536895A
JPS5536895A JP8716179A JP8716179A JPS5536895A JP S5536895 A JPS5536895 A JP S5536895A JP 8716179 A JP8716179 A JP 8716179A JP 8716179 A JP8716179 A JP 8716179A JP S5536895 A JPS5536895 A JP S5536895A
Authority
JP
Japan
Prior art keywords
circuit
program shutter
shutter time
exposure time
time signal
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
JP8716179A
Other languages
Japanese (ja)
Inventor
Yasuhiro Nanba
Yoshinori Tsujimoto
Seiji Yamada
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP8716179A priority Critical patent/JPS5536895A/en
Publication of JPS5536895A publication Critical patent/JPS5536895A/en
Pending legal-status Critical Current

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Landscapes

  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To simplify the circuit constitution, by converting the optimum exposure time obtained by photometry at open aperture into program shutter time.
CONSTITUTION: A memory circuit 2, a stage differential output circuit 4, a program shutter time signal generating circuit 5, an exposure time control circuit 7, and a stop-down device 6 are connected to a photoelectric conversion part 1. The photoelectric conversion part 1 measures the light of the subject transmitted through a photographic lens, and accounts the film sensitivity signal, etc. to output an optimum exposure time signal at open aperture, which is inputted into the stage differential output circuit 4 and program shutter time signal generating circuit 5 through the memory circuit 2. The stage differential output circuit 4 substracts the input signal from the output of the program shutter time signal generating circuit 5. According to this result, which is the number of stop-down stages at open aperture at the program shutter time, the stop-down device 6 is operated, and the program shutter time signal is inputted into the exposure time control circuit 7 to control the shutter.
COPYRIGHT: (C)1980,JPO&Japio
JP8716179A 1979-07-09 1979-07-09 Program shutter Pending JPS5536895A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8716179A JPS5536895A (en) 1979-07-09 1979-07-09 Program shutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8716179A JPS5536895A (en) 1979-07-09 1979-07-09 Program shutter

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP48081087A Division JPS618413B2 (en) 1973-07-17 1973-07-17

Publications (1)

Publication Number Publication Date
JPS5536895A true JPS5536895A (en) 1980-03-14

Family

ID=13907255

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8716179A Pending JPS5536895A (en) 1979-07-09 1979-07-09 Program shutter

Country Status (1)

Country Link
JP (1) JPS5536895A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5028831A (en) * 1973-07-16 1975-03-24

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5028831A (en) * 1973-07-16 1975-03-24

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