JPS6417247A - Optical head - Google Patents

Optical head

Info

Publication number
JPS6417247A
JPS6417247A JP17109387A JP17109387A JPS6417247A JP S6417247 A JPS6417247 A JP S6417247A JP 17109387 A JP17109387 A JP 17109387A JP 17109387 A JP17109387 A JP 17109387A JP S6417247 A JPS6417247 A JP S6417247A
Authority
JP
Japan
Prior art keywords
erasion
recording
polarization
use optical
transfer efficiency
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
JP17109387A
Other languages
Japanese (ja)
Inventor
Akinori Watabe
Shin Takayanagi
Shigetaro Iwazu
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP17109387A priority Critical patent/JPS6417247A/en
Publication of JPS6417247A publication Critical patent/JPS6417247A/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
    • G11B11/10532—Heads

Abstract

PURPOSE:To raise the transfer efficiency of a laser light for recording and erasion, and also, to improve the feedback transfer efficiency to a detecting optical system of a reproducing signal, by using two laser beams of each different wavelength, using one laser for recording and erasion, and using the other for reproduction. CONSTITUTION:Recording and erasion use optical systems 1-3 and reproduction use optical systems 11-13, using laser beams of each different wavelength are provided separately. Also, both a P polarization transmissivity and an S polarization reflection factor of a polarization beam splitter 3 of the recording and erasion use optical systems 1-3 are set to about 100%. As for a separation use polarization beam splitter 13 of an incident light and a reflected light of the reproduction use optical systems 11-13, its S polarization reflection factor is set to 100%, and its P polarization reflection factor is also set to an optimum value, irrespective of the P polarization transmissivity of the recording and erasion use optical system. In such a way, with regard to not only the transfer efficiency of the erasion use optical power, but also the feedback transfer efficiency to a detecting optical system of a reproducing signal, those which have a sufficient value are obtained.
JP17109387A 1987-07-10 1987-07-10 Optical head Pending JPS6417247A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17109387A JPS6417247A (en) 1987-07-10 1987-07-10 Optical head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17109387A JPS6417247A (en) 1987-07-10 1987-07-10 Optical head

Publications (1)

Publication Number Publication Date
JPS6417247A true JPS6417247A (en) 1989-01-20

Family

ID=15916857

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17109387A Pending JPS6417247A (en) 1987-07-10 1987-07-10 Optical head

Country Status (1)

Country Link
JP (1) JPS6417247A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1050877A1 (en) * 1998-08-28 2000-11-08 Nippon Telegraph and Telephone Corporation Opto-magnetic recording medium and its manufacturing method, and opto-magnetic information recording/reproducing device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60101745A (en) * 1983-11-08 1985-06-05 Sharp Corp Optical device of photomagnetic storage device
JPS61261838A (en) * 1985-05-16 1986-11-19 Toshiba Corp Erasable optical head
JPS6220149A (en) * 1985-07-18 1987-01-28 Fujitsu Ltd Optical head

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60101745A (en) * 1983-11-08 1985-06-05 Sharp Corp Optical device of photomagnetic storage device
JPS61261838A (en) * 1985-05-16 1986-11-19 Toshiba Corp Erasable optical head
JPS6220149A (en) * 1985-07-18 1987-01-28 Fujitsu Ltd Optical head

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1050877A1 (en) * 1998-08-28 2000-11-08 Nippon Telegraph and Telephone Corporation Opto-magnetic recording medium and its manufacturing method, and opto-magnetic information recording/reproducing device
EP1050877A4 (en) * 1998-08-28 2006-07-05 Nippon Telegraph & Telephone Opto-magnetic recording medium and its manufacturing method, and opto-magnetic information recording/reproducing device

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