JPS56133704A - Focus error detector - Google Patents
Focus error detectorInfo
- Publication number
- JPS56133704A JPS56133704A JP3710180A JP3710180A JPS56133704A JP S56133704 A JPS56133704 A JP S56133704A JP 3710180 A JP3710180 A JP 3710180A JP 3710180 A JP3710180 A JP 3710180A JP S56133704 A JPS56133704 A JP S56133704A
- Authority
- JP
- Japan
- Prior art keywords
- light
- slit
- mirror
- target face
- reflected
- 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)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To considerably expand the detection range of focus errors by providing a wave front converting means such as slit in the optical path of reflected light from a light focusing target face. CONSTITUTION:The parallel beams from a light source are reflected by a mirror 12 and are projected to a light focusing target face 7 via an objective lens 3. The reflected light passes again through the lens 3 and is made into parallel beams which arrive at the mirror 12. Since a slit 12 which is a wave front converting means is provided to the mirror 12 in a position off from the optical axis, part of the reflected light passes the slit 13 and is applied via focusing lens 5 to a bisected light detector 14. A focus error is detected by the difference in the quantities of light received in the right and left photodetectors forming the detector 14. Since the device is formed in this way, an unbalance in the quantities of the light received in the right and left photodetectors occurs even when the target face 7 is in a position extremely deviated from the focal position, whereby the detection range is expanded.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3710180A JPS56133704A (en) | 1980-03-24 | 1980-03-24 | Focus error detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3710180A JPS56133704A (en) | 1980-03-24 | 1980-03-24 | Focus error detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56133704A true JPS56133704A (en) | 1981-10-20 |
Family
ID=12488184
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3710180A Pending JPS56133704A (en) | 1980-03-24 | 1980-03-24 | Focus error detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56133704A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4517666A (en) * | 1981-06-22 | 1985-05-14 | Tokyo Shibaura Denki Kabushiki Kaisha | Optical head |
JPS60146920U (en) * | 1984-03-12 | 1985-09-30 | フオスタ−電機株式会社 | Optical information reproducing device |
US4546460A (en) * | 1981-10-22 | 1985-10-08 | Tokyo Shibaura Denki Kabushiki Kaisha | Videodisc autofocus device |
US4654516A (en) * | 1983-06-30 | 1987-03-31 | Kabushiki Kaisha Toshiba | Optical head |
-
1980
- 1980-03-24 JP JP3710180A patent/JPS56133704A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4517666A (en) * | 1981-06-22 | 1985-05-14 | Tokyo Shibaura Denki Kabushiki Kaisha | Optical head |
US4546460A (en) * | 1981-10-22 | 1985-10-08 | Tokyo Shibaura Denki Kabushiki Kaisha | Videodisc autofocus device |
US4654516A (en) * | 1983-06-30 | 1987-03-31 | Kabushiki Kaisha Toshiba | Optical head |
JPS60146920U (en) * | 1984-03-12 | 1985-09-30 | フオスタ−電機株式会社 | Optical information reproducing device |
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