JPS6213729B2 - - Google Patents

Info

Publication number
JPS6213729B2
JPS6213729B2 JP2191379A JP2191379A JPS6213729B2 JP S6213729 B2 JPS6213729 B2 JP S6213729B2 JP 2191379 A JP2191379 A JP 2191379A JP 2191379 A JP2191379 A JP 2191379A JP S6213729 B2 JPS6213729 B2 JP S6213729B2
Authority
JP
Japan
Prior art keywords
signal
photodetectors
light
pair
scratches
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.)
Expired
Application number
JP2191379A
Other languages
English (en)
Japanese (ja)
Other versions
JPS55117743A (en
Inventor
Juko Sugaya
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
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 Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Priority to JP2191379A priority Critical patent/JPS55117743A/ja
Publication of JPS55117743A publication Critical patent/JPS55117743A/ja
Publication of JPS6213729B2 publication Critical patent/JPS6213729B2/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
    • G11B7/0908—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 focusing only

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
JP2191379A 1979-02-28 1979-02-28 Automatic focusing system Granted JPS55117743A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2191379A JPS55117743A (en) 1979-02-28 1979-02-28 Automatic focusing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2191379A JPS55117743A (en) 1979-02-28 1979-02-28 Automatic focusing system

Publications (2)

Publication Number Publication Date
JPS55117743A JPS55117743A (en) 1980-09-10
JPS6213729B2 true JPS6213729B2 (ko) 1987-03-28

Family

ID=12068321

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2191379A Granted JPS55117743A (en) 1979-02-28 1979-02-28 Automatic focusing system

Country Status (1)

Country Link
JP (1) JPS55117743A (ko)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5841447A (ja) * 1981-09-04 1983-03-10 Hitachi Ltd 光スポット制御信号検出方法
FR2528605B1 (fr) * 1982-06-15 1987-11-20 Thomson Csf Procede et dispositif optique de focalisation d'un faisceau d'energie lumineuse sur un plan de reference d'un support d'information ainsi que ce support

Also Published As

Publication number Publication date
JPS55117743A (en) 1980-09-10

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