JPS57103142A - Grooveless information recording medium disk - Google Patents

Grooveless information recording medium disk

Info

Publication number
JPS57103142A
JPS57103142A JP17511881A JP17511881A JPS57103142A JP S57103142 A JPS57103142 A JP S57103142A JP 17511881 A JP17511881 A JP 17511881A JP 17511881 A JP17511881 A JP 17511881A JP S57103142 A JPS57103142 A JP S57103142A
Authority
JP
Japan
Prior art keywords
information signal
recording
recording medium
pits
correspond
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
JP17511881A
Other languages
Japanese (ja)
Inventor
Kosei Wada
Toshio Kaneshiro
Ichiro Ueno
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.)
Victor Company of Japan Ltd
Nippon Victor KK
Original Assignee
Victor Company of Japan Ltd
Nippon Victor KK
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 Victor Company of Japan Ltd, Nippon Victor KK filed Critical Victor Company of Japan Ltd
Priority to JP17511881A priority Critical patent/JPS57103142A/en
Publication of JPS57103142A publication Critical patent/JPS57103142A/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
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits

Abstract

PURPOSE:To prevent the generation of the distortion of a reproduction signal, the shortening of the life of a reproducing stylus, etc., by flattening a recording surface, by decreasing recording beam intensity for recording a main information signal in a section where another information signal is recorded adjacently. CONSTITUTION:Pits 1 which correspond to the 1st information signal (main information signal) form a spiral or concentric recording track and at its intermediate part, pits 2 and 3 which correspond to the 2nd information signal form recording tracks. When the main information signal is recorded on a recording medium disk like this, the intensity of a recording beam is made lower in a section A, where the 2nd information signal is recorded adjacently, than in the other section B, so that the surfaces of recording tracks formed by the pits 1 which correspond to the main information signal in both the sections A and B are included in the same surface.
JP17511881A 1981-10-31 1981-10-31 Grooveless information recording medium disk Pending JPS57103142A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17511881A JPS57103142A (en) 1981-10-31 1981-10-31 Grooveless information recording medium disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17511881A JPS57103142A (en) 1981-10-31 1981-10-31 Grooveless information recording medium disk

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP1443877A Division JPS5399923A (en) 1977-02-09 1977-02-12 Grooveless medium disc for imformation recording

Publications (1)

Publication Number Publication Date
JPS57103142A true JPS57103142A (en) 1982-06-26

Family

ID=15990582

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17511881A Pending JPS57103142A (en) 1981-10-31 1981-10-31 Grooveless information recording medium disk

Country Status (1)

Country Link
JP (1) JPS57103142A (en)

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