JPS55113197A - Optical memory unit - Google Patents

Optical memory unit

Info

Publication number
JPS55113197A
JPS55113197A JP1978279A JP1978279A JPS55113197A JP S55113197 A JPS55113197 A JP S55113197A JP 1978279 A JP1978279 A JP 1978279A JP 1978279 A JP1978279 A JP 1978279A JP S55113197 A JPS55113197 A JP S55113197A
Authority
JP
Japan
Prior art keywords
spots
track
data
interval
binary
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
JP1978279A
Other languages
Japanese (ja)
Other versions
JPS63849B2 (en
Inventor
Yoshidai Kitaoka
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1978279A priority Critical patent/JPS55113197A/en
Publication of JPS55113197A publication Critical patent/JPS55113197A/en
Publication of JPS63849B2 publication Critical patent/JPS63849B2/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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
    • 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
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To make it possible to bring a desired data track under follow-up control easily by a track servo mechanism by providing spots on the data track at even intervals. CONSTITUTION:On data tracks 30 and 31 of rotary disk 5 where spots are formed by light beams, extremely-small spots 32-35 are provided previously at even intervals, and lines of those spots are allotted to the binary state of binary data. In recording mode, a spot showing state ''1'' or ''0'' of binary data is formed between even-interval spots. Thus, track positions in recording mode can easily be detected by even-interval spots, so that track follow-up control can easily be carried into effect.
JP1978279A 1979-02-23 1979-02-23 Optical memory unit Granted JPS55113197A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1978279A JPS55113197A (en) 1979-02-23 1979-02-23 Optical memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1978279A JPS55113197A (en) 1979-02-23 1979-02-23 Optical memory unit

Related Child Applications (2)

Application Number Title Priority Date Filing Date
JP17700487A Division JPS63302422A (en) 1987-07-17 1987-07-17 Optical memory device
JP17700587A Division JPH0191323A (en) 1987-07-17 1987-07-17 Optical storage device

Publications (2)

Publication Number Publication Date
JPS55113197A true JPS55113197A (en) 1980-09-01
JPS63849B2 JPS63849B2 (en) 1988-01-08

Family

ID=12008889

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1978279A Granted JPS55113197A (en) 1979-02-23 1979-02-23 Optical memory unit

Country Status (1)

Country Link
JP (1) JPS55113197A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56151241U (en) * 1980-04-10 1981-11-12
JPS57181429A (en) * 1981-05-01 1982-11-08 Toshiba Corp Optical disc device
JPS57200947A (en) * 1981-06-01 1982-12-09 Toshiba Corp Information recording method for optical disk
FR2517103A1 (en) * 1981-11-25 1983-05-27 Hitachi Ltd APPARATUS FOR RECORDING AND REPRODUCING INFORMATION
EP0089734A2 (en) * 1982-03-19 1983-09-28 Control Data Corporation Disk-shaped record carrier
JPS62264435A (en) * 1986-05-12 1987-11-17 Csk Corp Recording system for data of optical recording medium
JPS63823A (en) * 1986-05-17 1988-01-05 Csk Corp Data read/write system for optical recording medium
JPH0191323A (en) * 1987-07-17 1989-04-11 Hitachi Ltd Optical storage device
JPH0855430A (en) * 1995-08-09 1996-02-27 Hitachi Ltd Information recorder and optical information recording medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5246052A (en) * 1975-10-09 1977-04-12 Givaudan & Cie Sa Aromatic compositions
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5246052A (en) * 1975-10-09 1977-04-12 Givaudan & Cie Sa Aromatic compositions
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

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56151241U (en) * 1980-04-10 1981-11-12
JPS57181429A (en) * 1981-05-01 1982-11-08 Toshiba Corp Optical disc device
JPS57200947A (en) * 1981-06-01 1982-12-09 Toshiba Corp Information recording method for optical disk
FR2517103A1 (en) * 1981-11-25 1983-05-27 Hitachi Ltd APPARATUS FOR RECORDING AND REPRODUCING INFORMATION
FR2569038A1 (en) * 1981-11-25 1986-02-14 Hitachi Ltd APPARATUS FOR RECORDING AND REPRODUCING INFORMATION
EP0089734A2 (en) * 1982-03-19 1983-09-28 Control Data Corporation Disk-shaped record carrier
JPS62264435A (en) * 1986-05-12 1987-11-17 Csk Corp Recording system for data of optical recording medium
JPS63823A (en) * 1986-05-17 1988-01-05 Csk Corp Data read/write system for optical recording medium
JPH0191323A (en) * 1987-07-17 1989-04-11 Hitachi Ltd Optical storage device
JPH0415529B2 (en) * 1987-07-17 1992-03-18 Hitachi Ltd
JPH0855430A (en) * 1995-08-09 1996-02-27 Hitachi Ltd Information recorder and optical information recording medium

Also Published As

Publication number Publication date
JPS63849B2 (en) 1988-01-08

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