JPS57120245A - Information storage medium - Google Patents

Information storage medium

Info

Publication number
JPS57120245A
JPS57120245A JP56005874A JP587481A JPS57120245A JP S57120245 A JPS57120245 A JP S57120245A JP 56005874 A JP56005874 A JP 56005874A JP 587481 A JP587481 A JP 587481A JP S57120245 A JPS57120245 A JP S57120245A
Authority
JP
Japan
Prior art keywords
reinforcement member
protective layers
layers
coefficient
thermal expansion
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
JP56005874A
Other languages
Japanese (ja)
Inventor
Hideo Ando
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56005874A priority Critical patent/JPS57120245A/en
Priority to EP81107782A priority patent/EP0049821B1/en
Priority to DE8181107782T priority patent/DE3176118D1/en
Priority to US06/309,405 priority patent/US4443806A/en
Publication of JPS57120245A publication Critical patent/JPS57120245A/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
    • 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)

Abstract

PURPOSE:To increase mechanical strength by interposing a reinforcement member between two transparent substrates each having a recording layer inside. CONSTITUTION:Protective layers 4A and 4B are fitted to one-side walls of recording layers 3A and 3B, and a reinforcement member 6 made of a metallic plate of aluminum, ''Duralumin '', etc., is interposed between the protective layers 4A and 4B. A hollow part 9 is formed between the outer circumferential part of the reinforcement member 6 and an external spacer 8 to prevent the generation of strain due to a difference in a coefficient of thermal expansion between the reinforcement member 6 and the transparent base plates 2A and 2B caused by temperature fluctuations. The surface of the member 6 is galvanized in black so that light transmitted through the recording layers 3A and 3B is not reflected by the surface. The reinforcement member 6 slides on the protective layers 4A and 4B freely, so no strain is generated even when there is a difference in coefficient of thermal expansion.
JP56005874A 1980-10-09 1981-01-20 Information storage medium Pending JPS57120245A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP56005874A JPS57120245A (en) 1981-01-20 1981-01-20 Information storage medium
EP81107782A EP0049821B1 (en) 1980-10-09 1981-09-30 Data recording medium
DE8181107782T DE3176118D1 (en) 1980-10-09 1981-09-30 Data recording medium
US06/309,405 US4443806A (en) 1980-10-09 1981-10-07 Data recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56005874A JPS57120245A (en) 1981-01-20 1981-01-20 Information storage medium

Publications (1)

Publication Number Publication Date
JPS57120245A true JPS57120245A (en) 1982-07-27

Family

ID=11623060

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56005874A Pending JPS57120245A (en) 1980-10-09 1981-01-20 Information storage medium

Country Status (1)

Country Link
JP (1) JPS57120245A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57212637A (en) * 1981-06-23 1982-12-27 Ricoh Co Ltd Optical disk
JPS60251535A (en) * 1984-05-29 1985-12-12 Daicel Chem Ind Ltd Stuck type information recording medium

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS531002A (en) * 1976-05-13 1978-01-07 Philips Corp Radiation sensitive record

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS531002A (en) * 1976-05-13 1978-01-07 Philips Corp Radiation sensitive record

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57212637A (en) * 1981-06-23 1982-12-27 Ricoh Co Ltd Optical disk
JPH0321975B2 (en) * 1981-06-23 1991-03-25 Ricoh Kk
JPS60251535A (en) * 1984-05-29 1985-12-12 Daicel Chem Ind Ltd Stuck type information recording medium
JPH0430653B2 (en) * 1984-05-29 1992-05-22

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