JPS57172541A - Information storage medium - Google Patents

Information storage medium

Info

Publication number
JPS57172541A
JPS57172541A JP56056721A JP5672181A JPS57172541A JP S57172541 A JPS57172541 A JP S57172541A JP 56056721 A JP56056721 A JP 56056721A JP 5672181 A JP5672181 A JP 5672181A JP S57172541 A JPS57172541 A JP S57172541A
Authority
JP
Japan
Prior art keywords
parts
spacer
storage medium
information storage
substrates
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
JP56056721A
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 JP56056721A priority Critical patent/JPS57172541A/en
Publication of JPS57172541A publication Critical patent/JPS57172541A/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

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE:To secure the assembly of an information storage medium formed by sticking two substrates, each having an information-formed layer on one surface, together with a spacer between, by forming positioning engagement stage parts at both the end surface parts of the spacer. CONSTITUTION:Through an internal spacer 4 and an external spacer 5 arranged concentrically, substrates 1 are stuck with information-formed layers 3 in while a hollow part 6 is formed between the counter surfaces of the information- formed layers 3, forming an information storage medium 7. At the external circumference parts of both the end surfaces of the spacers 4, positioning fitted stage parts 9 for the centering of rotation where the internal circumference parts 1a of the substrates 1 fit are formed. The external spacer 5 is formed annularly, and at the internal circumference parts of both its end surfaces, positioning fitted stage parts 10 for the centering of rotation where the external circumference parts 1b of the substrates 1 fit are formed. Thus, an air sandwich type information storage medium is assembled easily and securely while the eccentricity of each member is reduced as much as possible.
JP56056721A 1981-04-15 1981-04-15 Information storage medium Pending JPS57172541A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56056721A JPS57172541A (en) 1981-04-15 1981-04-15 Information storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56056721A JPS57172541A (en) 1981-04-15 1981-04-15 Information storage medium

Publications (1)

Publication Number Publication Date
JPS57172541A true JPS57172541A (en) 1982-10-23

Family

ID=13035347

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56056721A Pending JPS57172541A (en) 1981-04-15 1981-04-15 Information storage medium

Country Status (1)

Country Link
JP (1) JPS57172541A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985000238A1 (en) * 1983-06-24 1985-01-17 Eastman Kodak Company Optical disc unit with flexible cover sheet
FR2559607A1 (en) * 1984-02-14 1985-08-16 Philips Nv MEMORY DISK OPTICALLY READABLE
FR2559608A1 (en) * 1984-02-14 1985-08-16 Philips Nv OPTICALLY READABLE MEMORY DISC
JPS621147A (en) * 1985-02-18 1987-01-07 Hitachi Maxell Ltd Manufacture of optical disk
JPS6261065U (en) * 1985-10-03 1987-04-15

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985000238A1 (en) * 1983-06-24 1985-01-17 Eastman Kodak Company Optical disc unit with flexible cover sheet
FR2559607A1 (en) * 1984-02-14 1985-08-16 Philips Nv MEMORY DISK OPTICALLY READABLE
FR2559608A1 (en) * 1984-02-14 1985-08-16 Philips Nv OPTICALLY READABLE MEMORY DISC
JPS621147A (en) * 1985-02-18 1987-01-07 Hitachi Maxell Ltd Manufacture of optical disk
JPS6261065U (en) * 1985-10-03 1987-04-15
JPH0516691Y2 (en) * 1985-10-03 1993-05-06

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