JPS57181442A - Information storage medium - Google Patents

Information storage medium

Info

Publication number
JPS57181442A
JPS57181442A JP56065928A JP6592881A JPS57181442A JP S57181442 A JPS57181442 A JP S57181442A JP 56065928 A JP56065928 A JP 56065928A JP 6592881 A JP6592881 A JP 6592881A JP S57181442 A JPS57181442 A JP S57181442A
Authority
JP
Japan
Prior art keywords
interval
laser beam
recording
information
layer
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
JP56065928A
Other languages
Japanese (ja)
Other versions
JPH0454300B2 (en
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 JP56065928A priority Critical patent/JPS57181442A/en
Publication of JPS57181442A publication Critical patent/JPS57181442A/en
Publication of JPH0454300B2 publication Critical patent/JPH0454300B2/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

Abstract

PURPOSE:To prevent lowering in S/N through removing optical effects of laser beam at reading, by setting the interval between mutually opposing planes of a plurality of information recording layers recording optically information to a specified value or more. CONSTITUTION:A bonding layer (b) or a hollow part (c) is provided between a plurality of recording layers (a), (a), and the interval between the layers is defined as (l). When a hold (d) is provided in the form of an information pit for the upper recording layer (a), a laser beam (e) at reading passes through the hole (d) and returns with reflection on the recording layer (a) at the back side. To reduce the amount of reflected light, when the interval (l) is set to >=50mum by taking the wavelength of laser beam (e.g., 0.830mu) into consideration, the spot of laser beam is rapidly spread and the reduction in S/N can be prevented. That is, on a transparent base 1, a partitioning layer 3 setting the interval l3 between the opposing surfaces of the recording layers 2, 2 to >=50mum is provided, a rotating center hole 4 is provided at the center to constitute an objective information storage medium 5.
JP56065928A 1981-04-30 1981-04-30 Information storage medium Granted JPS57181442A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56065928A JPS57181442A (en) 1981-04-30 1981-04-30 Information storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56065928A JPS57181442A (en) 1981-04-30 1981-04-30 Information storage medium

Publications (2)

Publication Number Publication Date
JPS57181442A true JPS57181442A (en) 1982-11-08
JPH0454300B2 JPH0454300B2 (en) 1992-08-31

Family

ID=13301108

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56065928A Granted JPS57181442A (en) 1981-04-30 1981-04-30 Information storage medium

Country Status (1)

Country Link
JP (1) JPS57181442A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5114263A (en) * 1974-07-26 1976-02-04 Hitachi Ltd Setsugono roeiboshiho

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5114263A (en) * 1974-07-26 1976-02-04 Hitachi Ltd Setsugono roeiboshiho

Also Published As

Publication number Publication date
JPH0454300B2 (en) 1992-08-31

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