JPS57172542A - Information storage medium - Google Patents

Information storage medium

Info

Publication number
JPS57172542A
JPS57172542A JP56056722A JP5672281A JPS57172542A JP S57172542 A JPS57172542 A JP S57172542A JP 56056722 A JP56056722 A JP 56056722A JP 5672281 A JP5672281 A JP 5672281A JP S57172542 A JPS57172542 A JP S57172542A
Authority
JP
Japan
Prior art keywords
substrate
storage medium
information storage
reinforcing ring
circumference part
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
JP56056722A
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 JP56056722A priority Critical patent/JPS57172542A/en
Publication of JPS57172542A publication Critical patent/JPS57172542A/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
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation
    • G11B17/0287—Positioning or locking of single discs of discs rotating during transducing operation by permanent connections, e.g. screws, rivets
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/32—Maintaining desired spacing between record carrier and head, e.g. by fluid-dynamic spacing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0014—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form
    • G11B23/0021—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form discs
    • G11B23/0028—Details
    • G11B23/0035—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving
    • 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 prevent the substrate of a discoid information storage medium from curving by fitting a reinforcing ring made of an annular flat plate so that it is superposed upon the external circumference part of the substrate. CONSTITUTION:On one surface of a discoid substrate 1 made of a transparent plastic plate and having in its center a center hole 1a of rotation where the rotary center shaft 3 of the turntable 2 of an information processor is inserted, an information-formed layer 4 made of a recording layer or light reflective layer annularly is formed. At the external circumference part of each substrate 1, a reinfocing ring 8 made of an annular flat plate for preventing the substrate 1 from curving is fitted while being superposed, thus constituting an information storage medium 9. The reinforcing ring 8 is formed by punching a stainless steel plate having about 1.5mm. thickness, the external diameter of the reinforcing ring 8 is greater than that of the substrate 1, and its external circumference part serves as a guide surface 10.
JP56056722A 1981-04-15 1981-04-15 Information storage medium Pending JPS57172542A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56056722A JPS57172542A (en) 1981-04-15 1981-04-15 Information storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56056722A JPS57172542A (en) 1981-04-15 1981-04-15 Information storage medium

Publications (1)

Publication Number Publication Date
JPS57172542A true JPS57172542A (en) 1982-10-23

Family

ID=13035375

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56056722A Pending JPS57172542A (en) 1981-04-15 1981-04-15 Information storage medium

Country Status (1)

Country Link
JP (1) JPS57172542A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0105374A1 (en) * 1982-02-05 1984-04-18 Matsushita Electric Industrial Co., Ltd. Optical recording/reproduction disc
FR2559608A1 (en) * 1984-02-14 1985-08-16 Philips Nv OPTICALLY READABLE MEMORY DISC
FR2559607A1 (en) * 1984-02-14 1985-08-16 Philips Nv MEMORY DISK OPTICALLY READABLE

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0105374A1 (en) * 1982-02-05 1984-04-18 Matsushita Electric Industrial Co., Ltd. Optical recording/reproduction disc
FR2559608A1 (en) * 1984-02-14 1985-08-16 Philips Nv OPTICALLY READABLE MEMORY DISC
FR2559607A1 (en) * 1984-02-14 1985-08-16 Philips Nv MEMORY DISK OPTICALLY READABLE

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