JPS5697307A - Detection of focusing and photometry - Google Patents
Detection of focusing and photometryInfo
- Publication number
- JPS5697307A JPS5697307A JP17065579A JP17065579A JPS5697307A JP S5697307 A JPS5697307 A JP S5697307A JP 17065579 A JP17065579 A JP 17065579A JP 17065579 A JP17065579 A JP 17065579A JP S5697307 A JPS5697307 A JP S5697307A
- Authority
- JP
- Japan
- Prior art keywords
- exposure
- input device
- signal
- inexpensive
- photodetecting
- 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
Landscapes
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To make the devide inexpensive by processing photodetecting signals for focusing in a digital processing circuit and generating a focus detection signal as well as by processing a photometric signal for exposure detection in the same digital processing circuit via an analog input device and generating an exposure signal.
CONSTITUTION: A subject 1 is projected into a photodetecting device 4 via a photographic optical system 2 and a translucent mirror 3. The signals from the respective photodetectors of the photodetecting device 4 are sent via a parallel type AD converter 6 to a central controlling circuit 7, and after the arithmetic processing, a focus detection signal is outputted. On the other hand, F number, ASA value, aperture value and shutter speed value necessary for determining exposure are inputted via an analog input device 12. The light from a photodetector 13 for photometry inputs to the central controlling circuit 7 via the input device 12 and analog switch 5 then through the AD converter 6, so that an exposure determining signal is outputted. Since the analog input device 12 is an inexpensive circuit consisting of a resistance array, the device may be made inexpensive.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17065579A JPS5697307A (en) | 1979-12-29 | 1979-12-29 | Detection of focusing and photometry |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17065579A JPS5697307A (en) | 1979-12-29 | 1979-12-29 | Detection of focusing and photometry |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5697307A true JPS5697307A (en) | 1981-08-06 |
Family
ID=15908901
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17065579A Pending JPS5697307A (en) | 1979-12-29 | 1979-12-29 | Detection of focusing and photometry |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5697307A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6080814A (en) * | 1983-10-08 | 1985-05-08 | Asahi Optical Co Ltd | Automatic offset correcting circuit for camera |
-
1979
- 1979-12-29 JP JP17065579A patent/JPS5697307A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6080814A (en) * | 1983-10-08 | 1985-05-08 | Asahi Optical Co Ltd | Automatic offset correcting circuit for camera |
JPH0349082B2 (en) * | 1983-10-08 | 1991-07-26 | Asahi Optical Co Ltd |
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