JPS57189106A - Focus detector - Google Patents
Focus detectorInfo
- Publication number
- JPS57189106A JPS57189106A JP7438881A JP7438881A JPS57189106A JP S57189106 A JPS57189106 A JP S57189106A JP 7438881 A JP7438881 A JP 7438881A JP 7438881 A JP7438881 A JP 7438881A JP S57189106 A JPS57189106 A JP S57189106A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- image
- forming
- curved image
- correcting
- 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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/40—Optical focusing aids
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE:To remarkably increase the accuracy of focusing detection, by providing an optical member correcting the curved image of an image-forming optical system for focus detection near a photodetecting plane. CONSTITUTION:As optical members 8s and 8t correcting curved image of a reimage-forming lens, a convex lens or a convex cylindrical lens is used. An optical member for the correction of curved image is located near detecting planes 8e and 8f. Thus, by correctly forming the image with the lens on the surfaces 8e and 8f, even if a fixed aperture is used for the lens, and also even if the aperture is stopped for the lens, since the distribution of illumination can be uniformed, the focus detecting error can be eliminated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7438881A JPS57189106A (en) | 1981-05-18 | 1981-05-18 | Focus detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7438881A JPS57189106A (en) | 1981-05-18 | 1981-05-18 | Focus detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57189106A true JPS57189106A (en) | 1982-11-20 |
Family
ID=13545740
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7438881A Pending JPS57189106A (en) | 1981-05-18 | 1981-05-18 | Focus detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57189106A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6153615A (en) * | 1984-08-24 | 1986-03-17 | Canon Inc | Focus detecting device |
-
1981
- 1981-05-18 JP JP7438881A patent/JPS57189106A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6153615A (en) * | 1984-08-24 | 1986-03-17 | Canon Inc | Focus detecting device |
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