JPS5749904A - Focusing device - Google Patents
Focusing deviceInfo
- Publication number
- JPS5749904A JPS5749904A JP12450980A JP12450980A JPS5749904A JP S5749904 A JPS5749904 A JP S5749904A JP 12450980 A JP12450980 A JP 12450980A JP 12450980 A JP12450980 A JP 12450980A JP S5749904 A JPS5749904 A JP S5749904A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- picture element
- focus state
- compared
- output
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/34—Systems for automatic generation of focusing signals using different areas in a pupil plane
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE:To decide an in-focus state with high precision by performing operation, which corresponds to the forward and backward movements of a lens system by electric processing and by determining the position of the in-focus state. CONSTITUTION:Electric signals A' and B' are generated by the photosensitive parts 9 and 10 of an image sensor 6 respectively. The signals A' and B' for the (i)-th picture element are compared mutually and the resulting output is denoted as C0; and the signal A' for the (i)-th picture element and the signal B' for the (i-k)-th picture element are compared to obtain the output C-, and the signal A' for the (i)-th picture element and the signal B' for the (i+k)-th picture element are compared to obtain the output C+. In this case, the C0 is smallest in an in-focus state as shown by figure 62. When a lens 1 comes close to a main imaging surface 3 from a focusing state as shown by figure 61, the C0 increases and the C- is the smllest. In the opposite case, the C+ signal is smallest as shown by figure 63. Therefore, an in-focus state is decided precisely on the basis of the relation among the C0, C+ and C-.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12450980A JPS5749904A (en) | 1980-09-10 | 1980-09-10 | Focusing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12450980A JPS5749904A (en) | 1980-09-10 | 1980-09-10 | Focusing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5749904A true JPS5749904A (en) | 1982-03-24 |
Family
ID=14887238
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12450980A Pending JPS5749904A (en) | 1980-09-10 | 1980-09-10 | Focusing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5749904A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59126517A (en) * | 1983-01-10 | 1984-07-21 | Minolta Camera Co Ltd | Focusing detector of camera |
-
1980
- 1980-09-10 JP JP12450980A patent/JPS5749904A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59126517A (en) * | 1983-01-10 | 1984-07-21 | Minolta Camera Co Ltd | Focusing detector of camera |
JPH0666007B2 (en) * | 1983-01-10 | 1994-08-24 | ミノルタカメラ株式会社 | Camera focus detector |
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