JPS6476437A - Optical information recording and reproducing device - Google Patents
Optical information recording and reproducing deviceInfo
- Publication number
- JPS6476437A JPS6476437A JP62232963A JP23296387A JPS6476437A JP S6476437 A JPS6476437 A JP S6476437A JP 62232963 A JP62232963 A JP 62232963A JP 23296387 A JP23296387 A JP 23296387A JP S6476437 A JPS6476437 A JP S6476437A
- Authority
- JP
- Japan
- Prior art keywords
- light
- reflected light
- photodetector
- diffraction grating
- magneto
- 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
Abstract
PURPOSE:To surely detect the polarization direction of the reflected light and to miniaturize a device by providing a diffraction grating, which is different in inclination of a grating between both sides of the center line, and a light condensing element in the optical path of the reflected light. CONSTITUTION:The reflected light from a magneto-optical disk which is trans mitted through a polarizing beam splitter is made incident on the center line between diffraction gratings 31a and 31b, and the signal recorded on the magneto-optical disk is reproduced and detected when the difference of the quantity of diffracted light between diffraction gratings 31a and 31b is detected by a differential amplifier 38. The transmitted light of the diffraction grating 31a is condensed on a photodetector 35 by a lens 32 to perform tracking detec tion by the push-pull method. The transmitted light of the diffraction grating 31b is condensed on a photodetector 36 by a lens 33, and the signal of a photode tector 36 having the two-divided photodetector structure is inputted to a differen tial amplifier 39 to perform focusing detection by the knife edge method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62232963A JPS6476437A (en) | 1987-09-17 | 1987-09-17 | Optical information recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62232963A JPS6476437A (en) | 1987-09-17 | 1987-09-17 | Optical information recording and reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6476437A true JPS6476437A (en) | 1989-03-22 |
Family
ID=16947617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62232963A Pending JPS6476437A (en) | 1987-09-17 | 1987-09-17 | Optical information recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6476437A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02265038A (en) * | 1989-04-06 | 1990-10-29 | Ricoh Co Ltd | Optical information recording and reproducing device |
-
1987
- 1987-09-17 JP JP62232963A patent/JPS6476437A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02265038A (en) * | 1989-04-06 | 1990-10-29 | Ricoh Co Ltd | Optical information recording and reproducing device |
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