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JPS5637834A - Optical pickup - Google Patents

Optical pickup

Info

Publication number
JPS5637834A
JPS5637834A JP11351580A JP11351580A JPS5637834A JP S5637834 A JPS5637834 A JP S5637834A JP 11351580 A JP11351580 A JP 11351580A JP 11351580 A JP11351580 A JP 11351580A JP S5637834 A JPS5637834 A JP S5637834A
Authority
JP
Japan
Prior art keywords
disk
longitudinal mode
noise
optical pickup
multiplex
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.)
Granted
Application number
JP11351580A
Other languages
Japanese (ja)
Other versions
JPS599086B2 (en
Inventor
Kunio Aiki
Masahiro Oshima
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 JP55113515A priority Critical patent/JPS599086B2/en
Publication of JPS5637834A publication Critical patent/JPS5637834A/en
Publication of JPS599086B2 publication Critical patent/JPS599086B2/en
Expired 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
    • G11B7/13—Optical detectors therefor

Landscapes

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

Abstract

PURPOSE:To obtain an optical pickup that generates no noise by permitting a semiconductor laser to oscillate infixed multiplex longitudinal mode. CONSTITUTION:Semiconductor laser 1 is driven by electric current supplied from two electric power sources, DC electric power source 5 and high-frequency current source 6, to provide multiplex longitudinal mode oscillation and laser light that corresponds to the oscillation spectrum focuses on video disk 2 through condenser lenses 41 and 42 to pick up information on disk 2. Through this multiplex longitudinal mode oscillation, a light output varies smoothly against displacement due to the flopping of disk 2 and fluctuations of the light output in which the displacement of disk 2 happens at intervals of lambda/2 are suppressed, suppressing a low frequency range noise perfectly. Here, lambda represents the wavelength of the laser light. Simultaneously, the high-frequency driving multiplex longitudinal mode oscillation reduces the video noise level, so that an optical pickup can be obtained which generates no noise.
JP55113515A 1980-08-20 1980-08-20 optical information reproducing device Expired JPS599086B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55113515A JPS599086B2 (en) 1980-08-20 1980-08-20 optical information reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55113515A JPS599086B2 (en) 1980-08-20 1980-08-20 optical information reproducing device

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP58143874A Division JPS59130494A (en) 1983-08-08 1983-08-08 How to drive a semiconductor laser

Publications (2)

Publication Number Publication Date
JPS5637834A true JPS5637834A (en) 1981-04-11
JPS599086B2 JPS599086B2 (en) 1984-02-29

Family

ID=14614287

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55113515A Expired JPS599086B2 (en) 1980-08-20 1980-08-20 optical information reproducing device

Country Status (1)

Country Link
JP (1) JPS599086B2 (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58125245A (en) * 1982-01-22 1983-07-26 Hitachi Ltd Optical pickup device
JPS58175149A (en) * 1982-04-07 1983-10-14 Hitachi Ltd Optical pickup device
JPS59171037A (en) * 1983-03-18 1984-09-27 Hitachi Ltd Semiconductor laser driving method and driving device
JPS59207441A (en) * 1983-05-12 1984-11-24 Olympus Optical Co Ltd Optical pickup device
JPS60111057U (en) * 1983-12-28 1985-07-27 パイオニア株式会社 Semiconductor laser drive device
JPS60224134A (en) * 1984-04-20 1985-11-08 Yokogawa Hokushin Electric Corp Semiconductor laser device
JPS6150226A (en) * 1984-08-17 1986-03-12 Hitachi Ltd Automatic focus control system
JPS6219181A (en) * 1985-07-19 1987-01-27 コスモソニツク株式会社 Electrostatic discharge type treatment device
JPS62102768A (en) * 1985-10-30 1987-05-13 コスモソニツク株式会社 Skin activating device
JPS62117568A (en) * 1985-10-30 1987-05-29 コスモソニツク株式会社 Dermatophytosis treatment device
JPS62236561A (en) * 1986-04-09 1987-10-16 コスモソニツク株式会社 Allergenic rhinitis remedy device
EP0411120A1 (en) * 1987-04-15 1991-02-06 Sony Corporation Laser reproduction apparatus
JPH03105736A (en) * 1989-09-19 1991-05-02 Fujitsu Ltd optical disc device
US5250796A (en) * 1991-09-09 1993-10-05 Kabushiki Kaisha Toshiba Noise reduction system for optical record and reproduction apparatus using auto-power controlled semiconductor laser device
US5566142A (en) * 1994-02-10 1996-10-15 Olympus Optical Co., Ltd. Apparatus using an optical pickup
US5680384A (en) * 1992-11-17 1997-10-21 Seiko Epson Corporation Laser emission unit, optical head and optical memory device
EP0884720A1 (en) * 1996-03-01 1998-12-16 Hitachi, Ltd. Optical reproduction method and optical information apparatus
US6442120B2 (en) 1998-08-31 2002-08-27 Hitachi, Ltd. Optical reproduction method and optical information device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0369025A (en) * 1989-08-07 1991-03-25 Oki Electric Ind Co Ltd Method for focus adjustment of optical disk device
JPH087316A (en) 1994-06-21 1996-01-12 Canon Inc Optical information recording/reproducing apparatus
JP3639262B2 (en) 2002-03-13 2005-04-20 ローム株式会社 Optical pickup and optical disk system

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58125245A (en) * 1982-01-22 1983-07-26 Hitachi Ltd Optical pickup device
JPH0585970B2 (en) * 1982-01-22 1993-12-09 Hitachi Ltd
JPS58175149A (en) * 1982-04-07 1983-10-14 Hitachi Ltd Optical pickup device
JPH0580055B2 (en) * 1982-04-07 1993-11-05 Hitachi Ltd
JPS59171037A (en) * 1983-03-18 1984-09-27 Hitachi Ltd Semiconductor laser driving method and driving device
JPH0578093B2 (en) * 1983-03-18 1993-10-28 Hitachi Ltd
JPS59207441A (en) * 1983-05-12 1984-11-24 Olympus Optical Co Ltd Optical pickup device
JPH0227571Y2 (en) * 1983-12-28 1990-07-25
JPS60111057U (en) * 1983-12-28 1985-07-27 パイオニア株式会社 Semiconductor laser drive device
JPS60224134A (en) * 1984-04-20 1985-11-08 Yokogawa Hokushin Electric Corp Semiconductor laser device
JPS6150226A (en) * 1984-08-17 1986-03-12 Hitachi Ltd Automatic focus control system
JPH0324224B2 (en) * 1985-07-19 1991-04-02 Kosumo Sonitsuku Kk
JPS6219181A (en) * 1985-07-19 1987-01-27 コスモソニツク株式会社 Electrostatic discharge type treatment device
JPS62102768A (en) * 1985-10-30 1987-05-13 コスモソニツク株式会社 Skin activating device
JPS62117568A (en) * 1985-10-30 1987-05-29 コスモソニツク株式会社 Dermatophytosis treatment device
JPS62236561A (en) * 1986-04-09 1987-10-16 コスモソニツク株式会社 Allergenic rhinitis remedy device
EP0411120A1 (en) * 1987-04-15 1991-02-06 Sony Corporation Laser reproduction apparatus
JPH03105736A (en) * 1989-09-19 1991-05-02 Fujitsu Ltd optical disc device
US5250796A (en) * 1991-09-09 1993-10-05 Kabushiki Kaisha Toshiba Noise reduction system for optical record and reproduction apparatus using auto-power controlled semiconductor laser device
US5680384A (en) * 1992-11-17 1997-10-21 Seiko Epson Corporation Laser emission unit, optical head and optical memory device
US5566142A (en) * 1994-02-10 1996-10-15 Olympus Optical Co., Ltd. Apparatus using an optical pickup
EP0884720A1 (en) * 1996-03-01 1998-12-16 Hitachi, Ltd. Optical reproduction method and optical information apparatus
EP0884720A4 (en) * 1996-03-01 1999-09-01 Hitachi Ltd OPTICAL REPRODUCTION METHOD AND OPTICAL INFORMATION APPARATUS
US6442120B2 (en) 1998-08-31 2002-08-27 Hitachi, Ltd. Optical reproduction method and optical information device
US6614737B2 (en) 1998-08-31 2003-09-02 Hitachi, Ltd. Optical reproduction method and optical information device

Also Published As

Publication number Publication date
JPS599086B2 (en) 1984-02-29

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