JPS57141032A - Optical head and information reproducing device - Google Patents

Optical head and information reproducing device

Info

Publication number
JPS57141032A
JPS57141032A JP892882A JP892882A JPS57141032A JP S57141032 A JPS57141032 A JP S57141032A JP 892882 A JP892882 A JP 892882A JP 892882 A JP892882 A JP 892882A JP S57141032 A JPS57141032 A JP S57141032A
Authority
JP
Japan
Prior art keywords
tracks
disc
order
light beams
light flux
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
JP892882A
Other languages
Japanese (ja)
Inventor
Yoshito Tsunoda
Seiichi Mita
Fumio Imagawa
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP892882A priority Critical patent/JPS57141032A/en
Publication of JPS57141032A publication Critical patent/JPS57141032A/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
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/14—Heads, e.g. forming of the optical beam spot or modulation of the optical beam specially adapted to record on, or to reproduce from, more than one track simultaneously

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To reproduce information of plural tracks simultaneously, by separating a light flux to diffracted light beams to form signals corresponding to plural tracks on the surface of a disc. CONSTITUTION:The light flux from a laser light source 1 is separated to, for example, 5 diffracted light beams of order 0, order + or -1, and order + or -2 after passing through a diffraction grating 2, and these light beams are condensed through a lens 3, a half mirror 4, and a galvanomirror 5 onto a disc 7 as 5 minute spots by a moving lens 6. Information tracks are preliminarily recorded on the disc at equal pitches and are so arranged that converged minute spots 8 correspond to tracks 9 respectively. The reflection light flux from each track is separated by the mirror 4 and is led to detectors 10-1-10-5 to detect signals from respective information tracks independently.
JP892882A 1982-01-25 1982-01-25 Optical head and information reproducing device Pending JPS57141032A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP892882A JPS57141032A (en) 1982-01-25 1982-01-25 Optical head and information reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP892882A JPS57141032A (en) 1982-01-25 1982-01-25 Optical head and information reproducing device

Publications (1)

Publication Number Publication Date
JPS57141032A true JPS57141032A (en) 1982-09-01

Family

ID=11706316

Family Applications (1)

Application Number Title Priority Date Filing Date
JP892882A Pending JPS57141032A (en) 1982-01-25 1982-01-25 Optical head and information reproducing device

Country Status (1)

Country Link
JP (1) JPS57141032A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60131637A (en) * 1983-12-19 1985-07-13 General Res Obu Erekutoronitsukusu:Kk Optical data reading system
JPS62185257A (en) * 1986-02-12 1987-08-13 Canon Inc Optical head
JPS63268140A (en) * 1987-04-27 1988-11-04 Hitachi Ltd Optical information recording/reproducing device
JPS63273228A (en) * 1987-04-30 1988-11-10 Sony Corp Optical recording information reproducing device
JPH01124118A (en) * 1987-11-07 1989-05-17 Asaka:Kk Optical disk recording/reproducing device
JPH01178133A (en) * 1988-01-05 1989-07-14 Nec Corp Optical disk device
EP0336328A2 (en) * 1988-04-04 1989-10-11 Nippon Conlux Co., Ltd. Apparatus for optically recording and reproducing information
JPH0322227A (en) * 1989-06-19 1991-01-30 Matsushita Electric Ind Co Ltd Optical disk device
JPH0393049A (en) * 1989-09-05 1991-04-18 Victor Co Of Japan Ltd Multibeam optical reproducing device
FR2682518A1 (en) * 1991-10-14 1993-04-16 Pioneer Electronic Corp OPTICAL RECORDING MEDIUM AND APPARATUS FOR READING SUCH MEANS.
WO1993013522A1 (en) * 1991-12-24 1993-07-08 Samsung Electronics Co., Ltd. Wide beam detector system for optical memories
WO1994006113A1 (en) * 1992-08-28 1994-03-17 Toppan Printing Co., Ltd. Optical information recording medium and method of reading the same information
KR100258927B1 (en) * 1996-10-29 2000-06-15 윤종용 Compatible optical pickup for multi-track scanning

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295203A (en) * 1976-02-05 1977-08-10 Mitsubishi Electric Corp Information reproduction apparatus
JPH0594841A (en) * 1991-03-11 1993-04-16 Apple Computer Inc Electric connector and electrical connecting method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295203A (en) * 1976-02-05 1977-08-10 Mitsubishi Electric Corp Information reproduction apparatus
JPH0594841A (en) * 1991-03-11 1993-04-16 Apple Computer Inc Electric connector and electrical connecting method

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60131637A (en) * 1983-12-19 1985-07-13 General Res Obu Erekutoronitsukusu:Kk Optical data reading system
JPS62185257A (en) * 1986-02-12 1987-08-13 Canon Inc Optical head
JPS63268140A (en) * 1987-04-27 1988-11-04 Hitachi Ltd Optical information recording/reproducing device
JPS63273228A (en) * 1987-04-30 1988-11-10 Sony Corp Optical recording information reproducing device
JPH07114021B2 (en) * 1987-11-07 1995-12-06 株式会社アサカ Optical disc recording / reproducing device
JPH01124118A (en) * 1987-11-07 1989-05-17 Asaka:Kk Optical disk recording/reproducing device
JPH01178133A (en) * 1988-01-05 1989-07-14 Nec Corp Optical disk device
EP0336328A2 (en) * 1988-04-04 1989-10-11 Nippon Conlux Co., Ltd. Apparatus for optically recording and reproducing information
JPH0322227A (en) * 1989-06-19 1991-01-30 Matsushita Electric Ind Co Ltd Optical disk device
JPH0393049A (en) * 1989-09-05 1991-04-18 Victor Co Of Japan Ltd Multibeam optical reproducing device
US5430700A (en) * 1991-10-14 1995-07-04 Pioneer Electronic Corporation Apparatus for playing optical recording medium with combination tracks and plural beams tracking servo
FR2682518A1 (en) * 1991-10-14 1993-04-16 Pioneer Electronic Corp OPTICAL RECORDING MEDIUM AND APPARATUS FOR READING SUCH MEANS.
WO1993013522A1 (en) * 1991-12-24 1993-07-08 Samsung Electronics Co., Ltd. Wide beam detector system for optical memories
JPH06506557A (en) * 1991-12-24 1994-07-21 三星電子株式会社 Wide beam detection device for optical memory
WO1994006113A1 (en) * 1992-08-28 1994-03-17 Toppan Printing Co., Ltd. Optical information recording medium and method of reading the same information
US5570338A (en) * 1992-08-28 1996-10-29 Toppan Printing Co., Ltd. Optical information recording medium which uses diffraction grating
US5625619A (en) * 1992-08-28 1997-04-29 Toppan Printing Co., Ltd. Optical recording medium having a plurality of different diffraction grating cells
US5644565A (en) * 1992-08-28 1997-07-01 Toppan Printing Co., Ltd. Optical recording medium including a plurality of diffracted grating cells
KR100258927B1 (en) * 1996-10-29 2000-06-15 윤종용 Compatible optical pickup for multi-track scanning

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