JPS55113140A - Recording disk for optical information - Google Patents

Recording disk for optical information

Info

Publication number
JPS55113140A
JPS55113140A JP2119979A JP2119979A JPS55113140A JP S55113140 A JPS55113140 A JP S55113140A JP 2119979 A JP2119979 A JP 2119979A JP 2119979 A JP2119979 A JP 2119979A JP S55113140 A JPS55113140 A JP S55113140A
Authority
JP
Japan
Prior art keywords
internal stress
recording disk
coating film
optical information
little noise
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
JP2119979A
Other languages
Japanese (ja)
Inventor
Yoshiharu Tanaka
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.)
Mansei Kogyo KK
Original Assignee
Mansei Kogyo KK
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 Mansei Kogyo KK filed Critical Mansei Kogyo KK
Priority to JP2119979A priority Critical patent/JPS55113140A/en
Publication of JPS55113140A publication Critical patent/JPS55113140A/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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Manufacturing Optical Record Carriers (AREA)

Abstract

PURPOSE:To make it possible to detect information signals with a little noise by coating the surface of a recording disk, on which optical information has been recorded, with a transparent film whose internal stress has been removed by an annealing process, etc. CONSTITUTION:To form recording disk 1, the mold of an original disk with a continuous concave part showing an information signal is used to form coating film 1c and after a reflective film of aluminum 1b is vapor-deposited on the uneven surface under a vacuum, substrate 1a of resin, glass, etc., is formed on it. In this process, coating film 1c is under an influence of heat or pressure in press work and has internal stress even after the formation end. For the purpose, when coating film 1c is molded and the heated mold is pressed against resin in a plate shape, the internal stress is removed by gradual cooling, so that an information signal with a little noise can be detected even by using a pickup unit which makes use of polarization of beams.
JP2119979A 1979-02-24 1979-02-24 Recording disk for optical information Pending JPS55113140A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2119979A JPS55113140A (en) 1979-02-24 1979-02-24 Recording disk for optical information

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2119979A JPS55113140A (en) 1979-02-24 1979-02-24 Recording disk for optical information

Publications (1)

Publication Number Publication Date
JPS55113140A true JPS55113140A (en) 1980-09-01

Family

ID=12048296

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2119979A Pending JPS55113140A (en) 1979-02-24 1979-02-24 Recording disk for optical information

Country Status (1)

Country Link
JP (1) JPS55113140A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57169940A (en) * 1981-03-27 1982-10-19 Philips Nv Information disk and its manufacture
JPS60113345A (en) * 1983-11-24 1985-06-19 Hitachi Ltd Manufacture of substrate for optical disk

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57169940A (en) * 1981-03-27 1982-10-19 Philips Nv Information disk and its manufacture
JPH0353703B2 (en) * 1981-03-27 1991-08-15 Fuiritsupusu Furuuiranpenfuaburiken Nv
JPS60113345A (en) * 1983-11-24 1985-06-19 Hitachi Ltd Manufacture of substrate for optical disk
JPH0522299B2 (en) * 1983-11-24 1993-03-29 Hitachi Ltd

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