JPS5699326A - Exposure control device - Google Patents
Exposure control deviceInfo
- 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
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
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) |
-
1980
- 1980-01-10 JP JP164180A patent/JPS5699326A/en active Pending
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