JPS6427055A - Optical head device for magneto-optical disk - Google Patents

Optical head device for magneto-optical disk

Info

Publication number
JPS6427055A
JPS6427055A JP18391787A JP18391787A JPS6427055A JP S6427055 A JPS6427055 A JP S6427055A JP 18391787 A JP18391787 A JP 18391787A JP 18391787 A JP18391787 A JP 18391787A JP S6427055 A JPS6427055 A JP S6427055A
Authority
JP
Japan
Prior art keywords
recording medium
optical system
optical
magneto
polarization
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
JP18391787A
Other languages
Japanese (ja)
Inventor
Yutaka Yamanaka
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP18391787A priority Critical patent/JPS6427055A/en
Publication of JPS6427055A publication Critical patent/JPS6427055A/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

Abstract

PURPOSE:To present a miniaturized optical head device for a magneto-optical disk at low cost by using a wedged prism consisting of a convergent lens and an aeolotropic crystal and a two-division type photodetector for a second optical system which separates reflected light from a recording medium and conducts it to a photodetector. CONSTITUTION:Outgoing light from a semiconductor laser 1 is formed as a minute spot through two beam splitters 3 onto a recording medium 5. A part of the reflected light from the recording medium 5 is divided at a beam splitter 3, and conducted to the optical system for detecting polarization rotation. In this optical system, first, a polarization surface is rotated by 45 deg. by a 1/2 wavelength plate 6, P and S polarization components are separated by a wedged prism 7, and they are converged into the different light receiving surfaces of a two-division type photodetector 9 respectively by a convergent lens 8. Since the wedged prism 7 is formed with the aeolotropic crystal, an outgoing reflective angle can be differentiated by the P and S polarization components in the incoming light.
JP18391787A 1987-07-22 1987-07-22 Optical head device for magneto-optical disk Pending JPS6427055A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18391787A JPS6427055A (en) 1987-07-22 1987-07-22 Optical head device for magneto-optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18391787A JPS6427055A (en) 1987-07-22 1987-07-22 Optical head device for magneto-optical disk

Publications (1)

Publication Number Publication Date
JPS6427055A true JPS6427055A (en) 1989-01-30

Family

ID=16144074

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18391787A Pending JPS6427055A (en) 1987-07-22 1987-07-22 Optical head device for magneto-optical disk

Country Status (1)

Country Link
JP (1) JPS6427055A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5621714A (en) * 1994-02-12 1997-04-15 Olympus Optical Co., Ltd. Optical pick-up apparatus having hologram and beam splitter with birefringent member and polarizing film

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61233448A (en) * 1985-04-08 1986-10-17 Canon Inc Optical pickup device
JPS63308754A (en) * 1987-06-09 1988-12-16 Seiko Epson Corp Optical pickup
JPS6413243A (en) * 1987-07-06 1989-01-18 Seiko Epson Corp Optical pickup

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61233448A (en) * 1985-04-08 1986-10-17 Canon Inc Optical pickup device
JPS63308754A (en) * 1987-06-09 1988-12-16 Seiko Epson Corp Optical pickup
JPS6413243A (en) * 1987-07-06 1989-01-18 Seiko Epson Corp Optical pickup

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5621714A (en) * 1994-02-12 1997-04-15 Olympus Optical Co., Ltd. Optical pick-up apparatus having hologram and beam splitter with birefringent member and polarizing film

Similar Documents

Publication Publication Date Title
EP0840305B1 (en) Optical apparatus
EP0579843A4 (en) Phase varying device, and optical pickup apparatus using the same for magneto-optical storage
EP0283002A3 (en) Optical head
JPS57169947A (en) Magnetic optical head
JPS6427055A (en) Optical head device for magneto-optical disk
JPS60157730A (en) Optical head
KR100230227B1 (en) Optical pickup
JPH0478029A (en) Optical information recording and reproducing device
JPS578929A (en) Optical pickup device
JPS5766537A (en) Magnetooptic recording and reproducing device
JPS63261546A (en) Optical pickup
JPS6470936A (en) Two-beam optical head
JPS6414756A (en) Magneto-optical head
JPS5771537A (en) Optical pickup device
JPS6427057A (en) Optical head device for magneto-optical recording
JPH05303016A (en) Optical pickup
KR960042579A (en) Optical pick-up device
KR960007900B1 (en) Optical pick-up
JPS5717916A (en) Optical signal regenerating device
JPS641138A (en) Head for magneto-optical recording and reproducing device
JPS57191841A (en) Optical recording and reproducing device
KR100517963B1 (en) Magneto optic pick-up head
JP2748052B2 (en) Light separation element and light receiving optical device using the same
JP2570325B2 (en) Optical head
JPH03130019U (en)