JPS5699326A - Exposure control device - Google Patents

Exposure control device

Info

Publication number
JPS5699326A
JPS5699326A JP164180A JP164180A JPS5699326A JP S5699326 A JPS5699326 A JP S5699326A JP 164180 A JP164180 A JP 164180A JP 164180 A JP164180 A JP 164180A JP S5699326 A JPS5699326 A JP S5699326A
Authority
JP
Japan
Prior art keywords
supplied
outputs
circuit
comparator
decoder
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
JP164180A
Other languages
Japanese (ja)
Inventor
Kenji Nakauchi
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP164180A priority Critical patent/JPS5699326A/en
Priority to US06/218,566 priority patent/US4445778A/en
Publication of JPS5699326A publication Critical patent/JPS5699326A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To stabilize the subject luminance information after release starting by holding the results of the decision of a scene classifying circuit of the image screen of a camera or the outputs of selected subject luminance operating circuits.
CONSTITUTION: The photocurrent from photodetectors 8aW8p are logarithmically converted by operational amplifiers 16aW16p, after which they are weighted and are supplied to operational amplifiers 20, 23 and 26, 28. The measured outputs of the peripheral parts of the image screen are supplied to the amplifier 26, and the measured output in the central part and the luminance difference set value are supplied to the amplifier 28. The outputs of the amplifiers 26, 28 for scene classification undergo decision of their differential values in a comparator 32, and are applied to a decoder 34 via a holding circuit 33. In the circuit 33, the input signals are held by a release start signal. Hence, even if the comparator 32 inverts after the release start, the output of the decoder 34 does not change.
COPYRIGHT: (C)1981,JPO&Japio
JP164180A 1979-12-21 1980-01-10 Exposure control device Pending JPS5699326A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP164180A JPS5699326A (en) 1980-01-10 1980-01-10 Exposure control device
US06/218,566 US4445778A (en) 1979-12-21 1980-12-22 Method of and apparatus for measuring scene brightness

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP164180A JPS5699326A (en) 1980-01-10 1980-01-10 Exposure control device

Publications (1)

Publication Number Publication Date
JPS5699326A true JPS5699326A (en) 1981-08-10

Family

ID=11507145

Family Applications (1)

Application Number Title Priority Date Filing Date
JP164180A Pending JPS5699326A (en) 1979-12-21 1980-01-10 Exposure control device

Country Status (1)

Country Link
JP (1) JPS5699326A (en)

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