JPS6476437A - Optical information recording and reproducing device - Google Patents

Optical information recording and reproducing device

Info

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
Application number
JP62232963A
Other languages
Japanese (ja)
Inventor
Shigeru Ouchida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP62232963A priority Critical patent/JPS6476437A/en
Publication of JPS6476437A publication Critical patent/JPS6476437A/en
Pending legal-status Critical Current

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  • Optical Head (AREA)

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.
JP62232963A 1987-09-17 1987-09-17 Optical information recording and reproducing device Pending JPS6476437A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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