JPS57103134A - Optical disk - Google Patents

Optical disk

Info

Publication number
JPS57103134A
JPS57103134A JP17916580A JP17916580A JPS57103134A JP S57103134 A JPS57103134 A JP S57103134A JP 17916580 A JP17916580 A JP 17916580A JP 17916580 A JP17916580 A JP 17916580A JP S57103134 A JPS57103134 A JP S57103134A
Authority
JP
Japan
Prior art keywords
inter
light spot
track
group
disk
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
JP17916580A
Other languages
Japanese (ja)
Other versions
JPH0250535B2 (en
Inventor
Kenji Koishi
Tomio Yoshida
Isao Sato
Shunji Harikae
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 JP17916580A priority Critical patent/JPS57103134A/en
Publication of JPS57103134A publication Critical patent/JPS57103134A/en
Publication of JPH0250535B2 publication Critical patent/JPH0250535B2/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

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To discriminate inter-group gap of tracks on a disk by dividing the tracks on the disk into several groups and by making those groups different in shape and in optical characteristics. CONSTITUTION:Information recording track areas (group) 15 are formed by recording information in grooves as pits, or by recording information as pits by utilizing the variation of the reflectance of a photosensitive recording material applied on an optical disk 2 by exposing it to a projected light spot. A tracking error signal 9 is obtained from a signal waveform when the light spot crosses the track, and no track traverse signal is outputted when the light spot scans inter-group gap 16 where no track is provided, thereby discriminating inter-group gap 16 easily during retrieval when the light spot scans inter- group gap 16.
JP17916580A 1980-12-17 1980-12-17 Optical disk Granted JPS57103134A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17916580A JPS57103134A (en) 1980-12-17 1980-12-17 Optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17916580A JPS57103134A (en) 1980-12-17 1980-12-17 Optical disk

Publications (2)

Publication Number Publication Date
JPS57103134A true JPS57103134A (en) 1982-06-26
JPH0250535B2 JPH0250535B2 (en) 1990-11-02

Family

ID=16061070

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17916580A Granted JPS57103134A (en) 1980-12-17 1980-12-17 Optical disk

Country Status (1)

Country Link
JP (1) JPS57103134A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60229251A (en) * 1984-04-27 1985-11-14 Matsushita Electric Ind Co Ltd Optical information carrier
JPS6134733A (en) * 1984-07-25 1986-02-19 Hitachi Ltd Optical disc device
JPS62270032A (en) * 1986-05-19 1987-11-24 Matsushita Electric Ind Co Ltd Optical disk driving device
WO1989008913A1 (en) * 1988-03-18 1989-09-21 Matsushita Electric Industrial Co., Ltd. Opto-magnetic disc
US5285440A (en) * 1988-03-18 1994-02-08 Matsushita Electric Industrial Co., Ltd. Magneto-optic disk

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5379334A (en) * 1976-12-24 1978-07-13 Hitachi Ltd Memory unit
JPS54130102A (en) * 1978-03-16 1979-10-09 Philips Nv Method of writing information* recording carrier* recorded record carrier* and information writing and reading device
JPS5567949A (en) * 1978-11-08 1980-05-22 Philips Nv Memory carrier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5379334A (en) * 1976-12-24 1978-07-13 Hitachi Ltd Memory unit
JPS54130102A (en) * 1978-03-16 1979-10-09 Philips Nv Method of writing information* recording carrier* recorded record carrier* and information writing and reading device
JPS5567949A (en) * 1978-11-08 1980-05-22 Philips Nv Memory carrier

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60229251A (en) * 1984-04-27 1985-11-14 Matsushita Electric Ind Co Ltd Optical information carrier
JPS6134733A (en) * 1984-07-25 1986-02-19 Hitachi Ltd Optical disc device
JPS62270032A (en) * 1986-05-19 1987-11-24 Matsushita Electric Ind Co Ltd Optical disk driving device
WO1989008913A1 (en) * 1988-03-18 1989-09-21 Matsushita Electric Industrial Co., Ltd. Opto-magnetic disc
US5285440A (en) * 1988-03-18 1994-02-08 Matsushita Electric Industrial Co., Ltd. Magneto-optic disk

Also Published As

Publication number Publication date
JPH0250535B2 (en) 1990-11-02

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