JPS5766537A - Magnetooptic recording and reproducing device - Google Patents

Magnetooptic recording and reproducing device

Info

Publication number
JPS5766537A
JPS5766537A JP55141553A JP14155380A JPS5766537A JP S5766537 A JPS5766537 A JP S5766537A JP 55141553 A JP55141553 A JP 55141553A JP 14155380 A JP14155380 A JP 14155380A JP S5766537 A JPS5766537 A JP S5766537A
Authority
JP
Japan
Prior art keywords
degrees
prism
laser beam
faraday
light
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
JP55141553A
Other languages
Japanese (ja)
Inventor
Kenji Oota
Toshihisa Deguchi
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP55141553A priority Critical patent/JPS5766537A/en
Publication of JPS5766537A publication Critical patent/JPS5766537A/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
    • 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
    • G11B11/10532—Heads

Landscapes

  • Optical Head (AREA)

Abstract

PURPOSE:To prevent the incidence of return light to a laser beam sorce by arranging a Faraday effect element, having a plane of polarizatin rotatable by 45 degrees, between a couple of polarizing prisms whose transmission axes are set at 45 degrees. CONSTITUTION:On the optical path of laser beam polarizing prisms 5 and 7 whose transmission axes are set at 45 degrees are provided and between the two, Faraday glass 6 whose plane of polarization is rotatable by 45 degrees is arranged. In this constitution, the laser beam is passed through the prism 5 to obtain linear polarized light, which is turned by 45 degrees by the Faraday glass 6 to strike a recording track 23 by way of the prism 7, so that its reflected light is guided to a photodetector 15 through a beam splitter 8. In this case, the elliptic polarization component of the reflected light are removed by the prism 7 and its azimuth angle is increased by the Faraday glass 6 by 45 degrees to have a 90 degrees azimuth angle to the transmission axis by the prism 5. Therefore, it never returns to a laser beam source 3 and is reflected in a direction C, thus preventing the incidence to the light source.
JP55141553A 1980-10-09 1980-10-09 Magnetooptic recording and reproducing device Pending JPS5766537A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55141553A JPS5766537A (en) 1980-10-09 1980-10-09 Magnetooptic recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55141553A JPS5766537A (en) 1980-10-09 1980-10-09 Magnetooptic recording and reproducing device

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP14063090A Division JPH03198242A (en) 1990-05-30 1990-05-30 Magneto-optical recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS5766537A true JPS5766537A (en) 1982-04-22

Family

ID=15294638

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55141553A Pending JPS5766537A (en) 1980-10-09 1980-10-09 Magnetooptic recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS5766537A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57147148A (en) * 1981-03-05 1982-09-10 Olympus Optical Co Ltd Information reproducer with magnetooptic system
JPS58218003A (en) * 1982-06-14 1983-12-19 Pioneer Electronic Corp Recording system
JPS59215008A (en) * 1983-05-20 1984-12-04 Canon Inc Optical magnetic disc device
JPS60155024U (en) * 1984-03-27 1985-10-16 日本電気株式会社 light pick up
EP0179429A2 (en) * 1984-10-22 1986-04-30 Nec Corporation Magneto-optical reproducing head of a high light utilization rate
US4796241A (en) * 1986-01-23 1989-01-03 Sony Corporation Device for producing a high frequency modulation magnetic field used in magneto-optical recording
US5618638A (en) * 1990-01-29 1997-04-08 Brother Kogyo Kabushiki Kaisha Optical magnetic recording medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4977645A (en) * 1972-11-27 1974-07-26
JPS5456807A (en) * 1977-10-14 1979-05-08 Mitsubishi Electric Corp Photo-magnetic information reader
JPS5558834A (en) * 1978-10-27 1980-05-01 Fujitsu Ltd Optical readout method
JPS5755547A (en) * 1980-09-22 1982-04-02 Olympus Optical Co Ltd Information reader of photomagnetic recording medium

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4977645A (en) * 1972-11-27 1974-07-26
JPS5456807A (en) * 1977-10-14 1979-05-08 Mitsubishi Electric Corp Photo-magnetic information reader
JPS5558834A (en) * 1978-10-27 1980-05-01 Fujitsu Ltd Optical readout method
JPS5755547A (en) * 1980-09-22 1982-04-02 Olympus Optical Co Ltd Information reader of photomagnetic recording medium

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57147148A (en) * 1981-03-05 1982-09-10 Olympus Optical Co Ltd Information reproducer with magnetooptic system
JPH034975B2 (en) * 1981-03-05 1991-01-24 Olympus Optical Co
JPS58218003A (en) * 1982-06-14 1983-12-19 Pioneer Electronic Corp Recording system
JPS59215008A (en) * 1983-05-20 1984-12-04 Canon Inc Optical magnetic disc device
JPH053642B2 (en) * 1983-05-20 1993-01-18 Canon Kk
JPS60155024U (en) * 1984-03-27 1985-10-16 日本電気株式会社 light pick up
EP0179429A2 (en) * 1984-10-22 1986-04-30 Nec Corporation Magneto-optical reproducing head of a high light utilization rate
EP0179429A3 (en) * 1984-10-22 1988-07-20 Nec Corporation Magneto-optical reproducing head of a high light utilization rate
US4796241A (en) * 1986-01-23 1989-01-03 Sony Corporation Device for producing a high frequency modulation magnetic field used in magneto-optical recording
US5618638A (en) * 1990-01-29 1997-04-08 Brother Kogyo Kabushiki Kaisha Optical magnetic recording medium

Similar Documents

Publication Publication Date Title
ATE35581T1 (en) FIBER OPTIC BRANCH WITH LOW POLARIZATION EFFECTS.
WO1989001688A1 (en) Improved apparatus for magneto-optical recording
EP0579843A4 (en) Phase varying device, and optical pickup apparatus using the same for magneto-optical storage
GB1499562A (en) Optical record reader
KR920700449A (en) Optical reading device of optical record carrier
JPS5766537A (en) Magnetooptic recording and reproducing device
EP0385500A3 (en) Optical head
JPS56137307A (en) Optical branching filter
US4929067A (en) Method and apparatus for anamorphically shaping and deflecting electromagnetic beams
EP0395832A3 (en) Optical head
KR940006092A (en) Optical information playback device
KR930008762A (en) Optical pickup
JPS57169947A (en) Magnetic optical head
US5438562A (en) Optical head for recording and/or reproducing information on and/or from opto-magnetic record medium
EP0292160A3 (en) Head for reading a magneto-optical data carrier
JPS5661043A (en) Detector for focus
JPS5661045A (en) Optical information reader
JPS6484452A (en) Optical disk device
JPS6464156A (en) Optical information recording and reproducing device
JPS6414756A (en) Magneto-optical head
KR880011751A (en) Focus error detection device of magneto-optical head
JPS6460841A (en) Magneto-optical recording and reproducing device
JPH0328401Y2 (en)
JPS6414739A (en) Optical head for plural beams
JPS57124707A (en) Control system for polarizing direction for semiconductor laser oscillating beam