JPS5756827A - Automatic exposure control camera - Google Patents

Automatic exposure control camera

Info

Publication number
JPS5756827A
JPS5756827A JP13219180A JP13219180A JPS5756827A JP S5756827 A JPS5756827 A JP S5756827A JP 13219180 A JP13219180 A JP 13219180A JP 13219180 A JP13219180 A JP 13219180A JP S5756827 A JPS5756827 A JP S5756827A
Authority
JP
Japan
Prior art keywords
counter
partial photometric
supplied
frequency
pulse
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
JP13219180A
Other languages
Japanese (ja)
Inventor
Masabumi Yamazaki
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical 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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP13219180A priority Critical patent/JPS5756827A/en
Publication of JPS5756827A publication Critical patent/JPS5756827A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/091—Digital circuits

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE:To obtain desired accuracy by simple constitution, by using a frequency divider instead of a divider in order to deriving the mean of plural partial photometric values. CONSTITUTION:A partial photometric value digitized by a pulse which is generated whenever a partial photometric button is depressed is supplied to a register 250 from a D type FF242, and is added value is supplied to the preset terminal of a down-counter 256. The down-counter counts down an output pulse of a clock pulse oscillating circuit 258, and when it becomes ''0'', the oscillation is stopped. On the other hand, as for a frequency dividing circuit 260, its dividing ratio is decided by the number of times of depression (number of times of photometry) of the partial photometric button, the output pulse of the oscillating circuit 258 is frequency-divided, and after that, is supplied to a counter 262. In this way, the counter 262 obtains a mean value of plural partial photometric values.
JP13219180A 1980-09-22 1980-09-22 Automatic exposure control camera Pending JPS5756827A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13219180A JPS5756827A (en) 1980-09-22 1980-09-22 Automatic exposure control camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13219180A JPS5756827A (en) 1980-09-22 1980-09-22 Automatic exposure control camera

Publications (1)

Publication Number Publication Date
JPS5756827A true JPS5756827A (en) 1982-04-05

Family

ID=15075518

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13219180A Pending JPS5756827A (en) 1980-09-22 1980-09-22 Automatic exposure control camera

Country Status (1)

Country Link
JP (1) JPS5756827A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59204028A (en) * 1983-05-06 1984-11-19 Olympus Optical Co Ltd Electronic exposure control device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50129221A (en) * 1974-04-01 1975-10-13
JPS5475250A (en) * 1977-11-28 1979-06-15 Mitsubishi Electric Corp Digital division circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50129221A (en) * 1974-04-01 1975-10-13
JPS5475250A (en) * 1977-11-28 1979-06-15 Mitsubishi Electric Corp Digital division circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59204028A (en) * 1983-05-06 1984-11-19 Olympus Optical Co Ltd Electronic exposure control device

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