JPS5593131A - Exposure time setting and control circuit for camera - Google Patents

Exposure time setting and control circuit for camera

Info

Publication number
JPS5593131A
JPS5593131A JP119379A JP119379A JPS5593131A JP S5593131 A JPS5593131 A JP S5593131A JP 119379 A JP119379 A JP 119379A JP 119379 A JP119379 A JP 119379A JP S5593131 A JPS5593131 A JP S5593131A
Authority
JP
Japan
Prior art keywords
exposure time
inputted
counter
frequency
setting
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
JP119379A
Other languages
Japanese (ja)
Inventor
Yoshitaka Fujikawa
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP119379A priority Critical patent/JPS5593131A/en
Publication of JPS5593131A publication Critical patent/JPS5593131A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To improve the setting precision of exposure time in a simplie constitution, by setting the frequency of counter with upper bits of digital signal of exposure time and setting a necessary number of counts with the lower bits.
CONSTITUTION: An oscillator 1, and a divider 2 to divide down the output frequency fo of the oscillator 1 sequentially from f1 to fn are provided, and each output of the divider 2 is inputted into a frequency selector circuit 3. Upper bits CA of exposure time TV are inputted into a register 4, and a selective frequency fc is selected by the frequency select or circuit 3, and is inputted into a counter 6 through a gate 10. Lower bits CB of the exposure time TV are inputted into the counter 6, so that the number of counts is present. When signal Si is inputted and the counter 6 finishes the preset counting, a signal generator 7 generates an exposure time end signal, and the counting time by the counter 6 becomes the exposure time. Thus, the exposure time can be set at high precision, in a simple constitution.
COPYRIGHT: (C)1980,JPO&Japio
JP119379A 1979-01-09 1979-01-09 Exposure time setting and control circuit for camera Pending JPS5593131A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP119379A JPS5593131A (en) 1979-01-09 1979-01-09 Exposure time setting and control circuit for camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP119379A JPS5593131A (en) 1979-01-09 1979-01-09 Exposure time setting and control circuit for camera

Publications (1)

Publication Number Publication Date
JPS5593131A true JPS5593131A (en) 1980-07-15

Family

ID=11494612

Family Applications (1)

Application Number Title Priority Date Filing Date
JP119379A Pending JPS5593131A (en) 1979-01-09 1979-01-09 Exposure time setting and control circuit for camera

Country Status (1)

Country Link
JP (1) JPS5593131A (en)

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