JPH0156453B2 - - Google Patents

Info

Publication number
JPH0156453B2
JPH0156453B2 JP58244471A JP24447183A JPH0156453B2 JP H0156453 B2 JPH0156453 B2 JP H0156453B2 JP 58244471 A JP58244471 A JP 58244471A JP 24447183 A JP24447183 A JP 24447183A JP H0156453 B2 JPH0156453 B2 JP H0156453B2
Authority
JP
Japan
Prior art keywords
signal
focusing
focusing position
position control
objective lens
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
JP58244471A
Other languages
English (en)
Japanese (ja)
Other versions
JPS60138738A (ja
Inventor
Seiichi Oogoshi
Hiroshi Tanimoto
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 JP24447183A priority Critical patent/JPS60138738A/ja
Publication of JPS60138738A publication Critical patent/JPS60138738A/ja
Publication of JPH0156453B2 publication Critical patent/JPH0156453B2/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

  • Automatic Focus Adjustment (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Recording Or Reproduction (AREA)
JP24447183A 1983-12-27 1983-12-27 光学式情報再生装置 Granted JPS60138738A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24447183A JPS60138738A (ja) 1983-12-27 1983-12-27 光学式情報再生装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24447183A JPS60138738A (ja) 1983-12-27 1983-12-27 光学式情報再生装置

Publications (2)

Publication Number Publication Date
JPS60138738A JPS60138738A (ja) 1985-07-23
JPH0156453B2 true JPH0156453B2 (enExample) 1989-11-30

Family

ID=17119145

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24447183A Granted JPS60138738A (ja) 1983-12-27 1983-12-27 光学式情報再生装置

Country Status (1)

Country Link
JP (1) JPS60138738A (enExample)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL182257C (nl) * 1974-12-23 1988-02-01 Philips Nv Inrichting voor het uitlezen van een vlakke reflekterende registratiedrager waarop informatie is aangebracht in een optisch uitleesbare struktuur.

Also Published As

Publication number Publication date
JPS60138738A (ja) 1985-07-23

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