JPS5661048A - Optical memory medium - Google Patents

Optical memory medium

Info

Publication number
JPS5661048A
JPS5661048A JP13527379A JP13527379A JPS5661048A JP S5661048 A JPS5661048 A JP S5661048A JP 13527379 A JP13527379 A JP 13527379A JP 13527379 A JP13527379 A JP 13527379A JP S5661048 A JPS5661048 A JP S5661048A
Authority
JP
Japan
Prior art keywords
base
refractive index
memory medium
optical memory
plastic
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
JP13527379A
Other languages
Japanese (ja)
Other versions
JPS6130329B2 (en
Inventor
Manabu Yamamoto
Susumu Yonezawa
Shuzo Fukunishi
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP13527379A priority Critical patent/JPS5661048A/en
Publication of JPS5661048A publication Critical patent/JPS5661048A/en
Publication of JPS6130329B2 publication Critical patent/JPS6130329B2/ja
Granted 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

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE:To obtain an optical memory medium easy for tracking and excellent in the S/N, by burrying information track guide grooves formed on a transparent base with a material different from refractive index of the base to obtain a flat plane, and providing an optical recording layer on it. CONSTITUTION:On a transparent plastic base 1 (refractive index, n1) providing guide grooves 2 at the location of information track, a coating layer 3 (refractive index, n2) formed by burrying the grooves 2 with plastic different in the refractive index from the base 1, is provided, and an optical memory medium is made by forming a recording layer 4 on it. As said plastic material, it is preferable to use polymethyl methacrylate (n1=1.49) for the base 1, vinyl acetate (n2=1.45) and polyester resin (n2=1.54) for the coating layer 3.
JP13527379A 1979-10-22 1979-10-22 Optical memory medium Granted JPS5661048A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13527379A JPS5661048A (en) 1979-10-22 1979-10-22 Optical memory medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13527379A JPS5661048A (en) 1979-10-22 1979-10-22 Optical memory medium

Publications (2)

Publication Number Publication Date
JPS5661048A true JPS5661048A (en) 1981-05-26
JPS6130329B2 JPS6130329B2 (en) 1986-07-12

Family

ID=15147842

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13527379A Granted JPS5661048A (en) 1979-10-22 1979-10-22 Optical memory medium

Country Status (1)

Country Link
JP (1) JPS5661048A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4363924A (en) * 1980-11-14 1982-12-14 Basf Aktiengesellschaft Depolymerization of polytetramethylene glycol ethers
US4481620A (en) * 1981-03-24 1984-11-06 Tokyo Shibaura Denki Kabushiki Kaisha Pregrooved optical-disk
JPS601634A (en) * 1983-06-02 1985-01-07 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Optical recording medium
JPS6252739A (en) * 1985-09-02 1987-03-07 Canon Inc Optical recording medium
JPS62204448A (en) * 1986-03-04 1987-09-09 Matsushita Electric Ind Co Ltd Optical disk
US4984231A (en) * 1987-01-23 1991-01-08 Hitachi, Ltd. Optical information phase change recording medium having double protective layer
US5276673A (en) * 1989-05-18 1994-01-04 Mitsubishi Kasei Corporation Read-only optical disk containing a reflective layer comprising an Al alloy containing Ta

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0212820Y2 (en) * 1985-12-27 1990-04-10
JPH0343939Y2 (en) * 1986-08-28 1991-09-13
JPH0224421Y2 (en) * 1986-09-18 1990-07-04

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4363924A (en) * 1980-11-14 1982-12-14 Basf Aktiengesellschaft Depolymerization of polytetramethylene glycol ethers
US4481620A (en) * 1981-03-24 1984-11-06 Tokyo Shibaura Denki Kabushiki Kaisha Pregrooved optical-disk
JPS601634A (en) * 1983-06-02 1985-01-07 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Optical recording medium
JPH0370862B2 (en) * 1983-06-02 1991-11-11 Intaanashonaru Bijinesu Mashiinzu Corp
JPS6252739A (en) * 1985-09-02 1987-03-07 Canon Inc Optical recording medium
JPS62204448A (en) * 1986-03-04 1987-09-09 Matsushita Electric Ind Co Ltd Optical disk
US4984231A (en) * 1987-01-23 1991-01-08 Hitachi, Ltd. Optical information phase change recording medium having double protective layer
US5276673A (en) * 1989-05-18 1994-01-04 Mitsubishi Kasei Corporation Read-only optical disk containing a reflective layer comprising an Al alloy containing Ta

Also Published As

Publication number Publication date
JPS6130329B2 (en) 1986-07-12

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