JPS6459656A - Optical head for magneto-optical recording carrier - Google Patents

Optical head for magneto-optical recording carrier

Info

Publication number
JPS6459656A
JPS6459656A JP62216904A JP21690487A JPS6459656A JP S6459656 A JPS6459656 A JP S6459656A JP 62216904 A JP62216904 A JP 62216904A JP 21690487 A JP21690487 A JP 21690487A JP S6459656 A JPS6459656 A JP S6459656A
Authority
JP
Japan
Prior art keywords
light
polarization
optical
path
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
JP62216904A
Other languages
Japanese (ja)
Inventor
Masahiro Orukawa
Hideji Kawabata
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP62216904A priority Critical patent/JPS6459656A/en
Publication of JPS6459656A publication Critical patent/JPS6459656A/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
    • G11B11/105—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 using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing

Landscapes

  • Optical Head (AREA)

Abstract

PURPOSE:To prevent the generating of a power fluctuation due to the return light of a laser by arranging in the sequence a polarizing beam splitter, a half mirror and a 1/4 wavelength plate on the light path to arrive from a light source to an magneto- optical recording carrier. CONSTITUTION:A light to generate the change of a phase in accordance with the direction of a magnetization passes through a 1/4 wavelength plate 1 again and thus, the phase difference of the circular polarization is converted to the polarization surface rotation of a linear polarization. Thereafter, the light is divided by a half mirror 13, a part is guided to a polarization beam splitter 12 and others are guided to the optical path separated from the outgoing path. The light separated from the outgoing path converts the polarization surface rotation to the strong and weak signal of light and is detected by the detector, through an analyzer in the same way as the detection of a conventional magneto-optical signal. On the other hand, the light, which is not separated from the outgoing path by the half mirror 13 and passes through the same channel as the outgoing path, is almost an S polarization, and consequently, the large part is reflected by the polarization beam splitter 12. In short, the light quantity to return to a laser is rapidly decreased compared with an optical head for a conventional magneto-optical recording carrier.
JP62216904A 1987-08-31 1987-08-31 Optical head for magneto-optical recording carrier Pending JPS6459656A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62216904A JPS6459656A (en) 1987-08-31 1987-08-31 Optical head for magneto-optical recording carrier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62216904A JPS6459656A (en) 1987-08-31 1987-08-31 Optical head for magneto-optical recording carrier

Publications (1)

Publication Number Publication Date
JPS6459656A true JPS6459656A (en) 1989-03-07

Family

ID=16695737

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62216904A Pending JPS6459656A (en) 1987-08-31 1987-08-31 Optical head for magneto-optical recording carrier

Country Status (1)

Country Link
JP (1) JPS6459656A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03125339A (en) * 1989-10-11 1991-05-28 Sony Corp Optical pickup device
JPH03254450A (en) * 1990-03-05 1991-11-13 Sharp Corp Reproduction optical device for magneto-optical recording medium
JPH03283112A (en) * 1990-03-30 1991-12-13 Sony Corp Optical pickup device
US5537383A (en) * 1995-03-01 1996-07-16 Eastman Kodak Company Optical data storage system with differential data detection and source noise subtraction for use with magneto-optic, write-once and other optical media
US5586101A (en) * 1995-03-01 1996-12-17 Eastman Kodak Company Magneto-optic data storage system with differential detection channels having separate gain control circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03125339A (en) * 1989-10-11 1991-05-28 Sony Corp Optical pickup device
JPH03254450A (en) * 1990-03-05 1991-11-13 Sharp Corp Reproduction optical device for magneto-optical recording medium
JPH03283112A (en) * 1990-03-30 1991-12-13 Sony Corp Optical pickup device
US5537383A (en) * 1995-03-01 1996-07-16 Eastman Kodak Company Optical data storage system with differential data detection and source noise subtraction for use with magneto-optic, write-once and other optical media
US5586101A (en) * 1995-03-01 1996-12-17 Eastman Kodak Company Magneto-optic data storage system with differential detection channels having separate gain control circuit

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