JPS5651705A - Focus detector - Google Patents
Focus detectorInfo
- Publication number
- JPS5651705A JPS5651705A JP12779679A JP12779679A JPS5651705A JP S5651705 A JPS5651705 A JP S5651705A JP 12779679 A JP12779679 A JP 12779679A JP 12779679 A JP12779679 A JP 12779679A JP S5651705 A JPS5651705 A JP S5651705A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- photodetection signals
- signals
- holding
- during
- 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.)
- Granted
Links
Landscapes
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
PURPOSE: To make accurate detection even of dark subjects by hodling respective photodetecting signals when the photodetection signals reach a fixed value, operating the respective photodetection signals during holding period and outputting the operation signal corresponding to the distance up to the subject.
CONSTITUTION: A photodetecting circuit 10 having a plurality of photodetectors outputting the photodetection signals corresponding to the quantity of received light and a sample holding circuit 14 connected to this circuit 10 and holding the respective photodetection signals when the photodetection signals reach a fixed value are provided. In addition, an arithmetic circuit 26 which operates the respective photodetection signals and outputs the operation signal corresponding to the distance up to the subject during the holding period of this sample holding circuit 14 and a display means which is energized by a display driving circuit 28 during the sampling period of the sample holding circuit 14 are provided. Consequently, the device which can accurately detect focal length even for dark subjects is provided.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12779679A JPS5651705A (en) | 1979-10-03 | 1979-10-03 | Focus detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12779679A JPS5651705A (en) | 1979-10-03 | 1979-10-03 | Focus detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5651705A true JPS5651705A (en) | 1981-05-09 |
JPS624685B2 JPS624685B2 (en) | 1987-01-31 |
Family
ID=14968881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12779679A Granted JPS5651705A (en) | 1979-10-03 | 1979-10-03 | Focus detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5651705A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4470683A (en) * | 1982-06-29 | 1984-09-11 | Olympus Optical Company Ltd. | Focussing condition detector |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0543349Y2 (en) * | 1987-09-07 | 1993-11-01 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5145556A (en) * | 1974-10-17 | 1976-04-19 | Ricoh Kk | Kyorikenshutsu hoho oyobi sochi |
JPS54126023A (en) * | 1978-03-23 | 1979-09-29 | Canon Inc | Optical device |
-
1979
- 1979-10-03 JP JP12779679A patent/JPS5651705A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5145556A (en) * | 1974-10-17 | 1976-04-19 | Ricoh Kk | Kyorikenshutsu hoho oyobi sochi |
JPS54126023A (en) * | 1978-03-23 | 1979-09-29 | Canon Inc | Optical device |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4470683A (en) * | 1982-06-29 | 1984-09-11 | Olympus Optical Company Ltd. | Focussing condition detector |
Also Published As
Publication number | Publication date |
---|---|
JPS624685B2 (en) | 1987-01-31 |
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