JPS57158045A - Optical disk player - Google Patents

Optical disk player

Info

Publication number
JPS57158045A
JPS57158045A JP56041521A JP4152181A JPS57158045A JP S57158045 A JPS57158045 A JP S57158045A JP 56041521 A JP56041521 A JP 56041521A JP 4152181 A JP4152181 A JP 4152181A JP S57158045 A JPS57158045 A JP S57158045A
Authority
JP
Japan
Prior art keywords
type
layer
electrodes
laser beams
independent information
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
JP56041521A
Other languages
Japanese (ja)
Inventor
Tatsuhiko Niina
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.)
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Sanyo Denki Co 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 Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP56041521A priority Critical patent/JPS57158045A/en
Publication of JPS57158045A publication Critical patent/JPS57158045A/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)

Abstract

PURPOSE:To reproduce pieces of independent information at the same time by semiconductor laser device which emits laser beams, and a disk record which has spiral tracks. CONSTITUTION:On an n type GaAs substrate (a), n type clad layers (b1)-(b4), n type active layers C1-C3, and an n type GaAs layer (d) are formed successively by capital crystal growth, and Zinc is diffused from part of the layer (d) to the layer (b1) to make part of each layer into a p type area; and a couple of electrodes (e) and (f) are formed in the n type and p type areas of the layer (d), which is removed between the electrodes. Forward currents are flowed to those electrodes to generate three laser beams at the same time and nearly in the same direction. A disk record has triple spiral tracks independent of one another, and on each track, independent information is recorded. Those tracks are irradiated with three laser beams generated by the semiconductor laser device constituted as mentioned above to detect their reflected beams by photoelectric sensors, thus reproducing three pieces of independent information simultaneously.
JP56041521A 1981-03-20 1981-03-20 Optical disk player Pending JPS57158045A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56041521A JPS57158045A (en) 1981-03-20 1981-03-20 Optical disk player

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56041521A JPS57158045A (en) 1981-03-20 1981-03-20 Optical disk player

Publications (1)

Publication Number Publication Date
JPS57158045A true JPS57158045A (en) 1982-09-29

Family

ID=12610679

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56041521A Pending JPS57158045A (en) 1981-03-20 1981-03-20 Optical disk player

Country Status (1)

Country Link
JP (1) JPS57158045A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01178131A (en) * 1988-01-05 1989-07-14 Nec Corp Optical disk
US6049518A (en) * 1995-08-31 2000-04-11 Sanyo Electric Co., Ltd. Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5280008A (en) * 1975-12-26 1977-07-05 Sony Corp Video disc
JPS52155078A (en) * 1976-06-18 1977-12-23 Toshiba Corp Semiconductor light emitting device
JPS54146613A (en) * 1978-05-10 1979-11-16 Hitachi Ltd Optical head

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5280008A (en) * 1975-12-26 1977-07-05 Sony Corp Video disc
JPS52155078A (en) * 1976-06-18 1977-12-23 Toshiba Corp Semiconductor light emitting device
JPS54146613A (en) * 1978-05-10 1979-11-16 Hitachi Ltd Optical head

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01178131A (en) * 1988-01-05 1989-07-14 Nec Corp Optical disk
US6049518A (en) * 1995-08-31 2000-04-11 Sanyo Electric Co., Ltd. Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards
US6122242A (en) * 1995-08-31 2000-09-19 Sanyo Electric Co., Ltd. Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards
US6137764A (en) * 1995-08-31 2000-10-24 Sanyo Electric Co., Ltd. Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards
US6167019A (en) * 1995-08-31 2000-12-26 Sanyo Electric Co., Ltd. Optical Disc cd recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards

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