JPS57150158A - Magnetooptic recording medium - Google Patents

Magnetooptic recording medium

Info

Publication number
JPS57150158A
JPS57150158A JP3625481A JP3625481A JPS57150158A JP S57150158 A JPS57150158 A JP S57150158A JP 3625481 A JP3625481 A JP 3625481A JP 3625481 A JP3625481 A JP 3625481A JP S57150158 A JPS57150158 A JP S57150158A
Authority
JP
Japan
Prior art keywords
magnetooptic
effect
farady
recording medium
kerr
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
JP3625481A
Other languages
Japanese (ja)
Inventor
Masaaki Nomura
Hideo Inuzuka
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 JP3625481A priority Critical patent/JPS57150158A/en
Publication of JPS57150158A publication Critical patent/JPS57150158A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field

Abstract

PURPOSE:To achieve magnetooptic recording medium with a good contrast of reproduction and small sized device, in which a magnetooptic thin film having the Kerr effect and that having the Farady effect can sequentially formed on both sides of the base. CONSTITUTION:Thin films 2 and 3 of a magnetooptic material of light reflection having the Kerr effect are formed on both sides of a base 1 with a method such as vapor deposition, and thin films 4 and 5 of a photo transparent magnetooptic material having the Farady effect are formed closingly with a method such as vapor deposition, and further, protective films 6 and 7 are added on them to achieve an objective magnetooptic recording medium. The obtained medium has a reproduction system simultaneously using the Kerr effect and the Farady effect as the reproducing means of a recording signal. In this case, the Farady rotating angle becomes twice as large because the same position of the magnetooptic material thin film is reciprocated by light, and the Kerr rotating angle is added, allowing to have excellent contrast of reproduction and easy detection.
JP3625481A 1981-03-13 1981-03-13 Magnetooptic recording medium Pending JPS57150158A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3625481A JPS57150158A (en) 1981-03-13 1981-03-13 Magnetooptic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3625481A JPS57150158A (en) 1981-03-13 1981-03-13 Magnetooptic recording medium

Publications (1)

Publication Number Publication Date
JPS57150158A true JPS57150158A (en) 1982-09-16

Family

ID=12464631

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3625481A Pending JPS57150158A (en) 1981-03-13 1981-03-13 Magnetooptic recording medium

Country Status (1)

Country Link
JP (1) JPS57150158A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58153244A (en) * 1982-03-05 1983-09-12 Matsushita Electric Ind Co Ltd Photomagnetic recording medium
WO1991011807A1 (en) * 1990-01-31 1991-08-08 Sony Corporation Optical disc system and optical disc
US5910932A (en) * 1991-09-11 1999-06-08 Sony Corporation Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk
USRE37428E1 (en) 1990-01-31 2001-10-30 Sony Corporation Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57120254A (en) * 1981-01-14 1982-07-27 Matsushita Electric Ind Co Ltd Magnetooptical recording carrier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57120254A (en) * 1981-01-14 1982-07-27 Matsushita Electric Ind Co Ltd Magnetooptical recording carrier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58153244A (en) * 1982-03-05 1983-09-12 Matsushita Electric Ind Co Ltd Photomagnetic recording medium
WO1991011807A1 (en) * 1990-01-31 1991-08-08 Sony Corporation Optical disc system and optical disc
USRE37428E1 (en) 1990-01-31 2001-10-30 Sony Corporation Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens
US5910932A (en) * 1991-09-11 1999-06-08 Sony Corporation Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk

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