JPS57117137A - Optical disc player - Google Patents

Optical disc player

Info

Publication number
JPS57117137A
JPS57117137A JP56003442A JP344281A JPS57117137A JP S57117137 A JPS57117137 A JP S57117137A JP 56003442 A JP56003442 A JP 56003442A JP 344281 A JP344281 A JP 344281A JP S57117137 A JPS57117137 A JP S57117137A
Authority
JP
Japan
Prior art keywords
lens
optical disc
disc player
light source
convex
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
JP56003442A
Other languages
Japanese (ja)
Inventor
Yutaka Oki
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP56003442A priority Critical patent/JPS57117137A/en
Publication of JPS57117137A publication Critical patent/JPS57117137A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE:To make the device small, by extending an optical beam while keeping the parallellism in an optical system consisting of a convex and a concave lens from a light source, and supplying the beam to a collecting lens. CONSTITUTION:A light beam 2 from a laser light source 1 becomes a parallel beam 2'' with a concave lens 33 and a convex lens 34, in which the beam diameter is extended and is collected on an optical disc 5 through an objective lens 4'. Thus, the device is small in size.
JP56003442A 1981-01-13 1981-01-13 Optical disc player Pending JPS57117137A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56003442A JPS57117137A (en) 1981-01-13 1981-01-13 Optical disc player

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56003442A JPS57117137A (en) 1981-01-13 1981-01-13 Optical disc player

Publications (1)

Publication Number Publication Date
JPS57117137A true JPS57117137A (en) 1982-07-21

Family

ID=11557458

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56003442A Pending JPS57117137A (en) 1981-01-13 1981-01-13 Optical disc player

Country Status (1)

Country Link
JP (1) JPS57117137A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0766237A1 (en) * 1995-09-29 1997-04-02 Nec Corporation Optical head device with lens system for increasing beam diameter of light to be incident on objective lens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0766237A1 (en) * 1995-09-29 1997-04-02 Nec Corporation Optical head device with lens system for increasing beam diameter of light to be incident on objective lens
JPH0991747A (en) * 1995-09-29 1997-04-04 Nec Corp Optical head device
US5708642A (en) * 1995-09-29 1998-01-13 Nec Corporation Optical head device with lens system for increasing beam diameter of light to be incident on objective lens

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