JPS57141035A - Optical recording and reproducing disc - Google Patents

Optical recording and reproducing disc

Info

Publication number
JPS57141035A
JPS57141035A JP56027343A JP2734381A JPS57141035A JP S57141035 A JPS57141035 A JP S57141035A JP 56027343 A JP56027343 A JP 56027343A JP 2734381 A JP2734381 A JP 2734381A JP S57141035 A JPS57141035 A JP S57141035A
Authority
JP
Japan
Prior art keywords
region
track
regions
disc
evaluation
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
JP56027343A
Other languages
Japanese (ja)
Other versions
JPH0250536B2 (en
Inventor
Tomio Yoshida
Noboru Wakami
Tamotsu Matsuo
Haruo Yamashita
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP56027343A priority Critical patent/JPS57141035A/en
Publication of JPS57141035A publication Critical patent/JPS57141035A/en
Publication of JPH0250536B2 publication Critical patent/JPH0250536B2/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
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits

Abstract

PURPOSE:To facilitate and ensure the execution of the test for the quality of a disc and the returning of an optical head to an information track, by providing track regions for evaluation on the inside circumference, the outside circumference, etc. of the information track region. CONSTITUTION:A magnetic disc 1 is provided with an information recording region L of tracks of a spiral form or the like and track regions K and M for evaluation of concentric circle-shaped tracks having respective address numbers on the outside circumference, the inside circumference, etc. of this region L. Consequently, tracks of regions K and M are utilized to execute easily and surely desired test and inspection such as the test for S/N of the disc 1. Even if an optical head jumps out from the region L by vibration or the like, the optical head is returned to the region L easily and surely through regions K and M. When the track region for evaluation is provided on either of the inside circumference and the outside circumference of the region L, the same operation is performed also.
JP56027343A 1981-02-25 1981-02-25 Optical recording and reproducing disc Granted JPS57141035A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56027343A JPS57141035A (en) 1981-02-25 1981-02-25 Optical recording and reproducing disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56027343A JPS57141035A (en) 1981-02-25 1981-02-25 Optical recording and reproducing disc

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP24714989A Division JPH02126426A (en) 1989-09-22 1989-09-22 Optical recording and reproducing device

Publications (2)

Publication Number Publication Date
JPS57141035A true JPS57141035A (en) 1982-09-01
JPH0250536B2 JPH0250536B2 (en) 1990-11-02

Family

ID=12218397

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56027343A Granted JPS57141035A (en) 1981-02-25 1981-02-25 Optical recording and reproducing disc

Country Status (1)

Country Link
JP (1) JPS57141035A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58169352A (en) * 1982-03-31 1983-10-05 Hitachi Ltd Optical recording medium
JPS59180229U (en) * 1983-05-20 1984-12-01 三洋電機株式会社 optical recording medium
JPS61172233A (en) * 1985-01-25 1986-08-02 Nec Corp Substrate for optical disk
JPH027243A (en) * 1989-03-14 1990-01-11 Hitachi Maxell Ltd Optical disk and its manufacturing
JPH02247840A (en) * 1989-03-20 1990-10-03 Nec Corp Optical disk substrate
JPH062381U (en) * 1992-06-08 1994-01-14 有限会社民芸品さとう price tag
JPH06203413A (en) * 1993-09-27 1994-07-22 Hitachi Ltd Optical recording medium and recording and reproducing method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5479004A (en) * 1977-12-06 1979-06-23 Victor Co Of Japan Ltd Disc form recording medium
JPS5616949A (en) * 1979-07-16 1981-02-18 Discovision Ass Home video player*recorder and blank recording disk

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5479004A (en) * 1977-12-06 1979-06-23 Victor Co Of Japan Ltd Disc form recording medium
JPS5616949A (en) * 1979-07-16 1981-02-18 Discovision Ass Home video player*recorder and blank recording disk

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58169352A (en) * 1982-03-31 1983-10-05 Hitachi Ltd Optical recording medium
JPS59180229U (en) * 1983-05-20 1984-12-01 三洋電機株式会社 optical recording medium
JPS61172233A (en) * 1985-01-25 1986-08-02 Nec Corp Substrate for optical disk
JPH047019B2 (en) * 1985-01-25 1992-02-07 Nippon Electric Co
JPH027243A (en) * 1989-03-14 1990-01-11 Hitachi Maxell Ltd Optical disk and its manufacturing
JPH0444818B2 (en) * 1989-03-14 1992-07-22 Hitachi Maxell
JPH02247840A (en) * 1989-03-20 1990-10-03 Nec Corp Optical disk substrate
JPH062381U (en) * 1992-06-08 1994-01-14 有限会社民芸品さとう price tag
JPH06203413A (en) * 1993-09-27 1994-07-22 Hitachi Ltd Optical recording medium and recording and reproducing method

Also Published As

Publication number Publication date
JPH0250536B2 (en) 1990-11-02

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