JPH0447895B2 - - Google Patents

Info

Publication number
JPH0447895B2
JPH0447895B2 JP58136158A JP13615883A JPH0447895B2 JP H0447895 B2 JPH0447895 B2 JP H0447895B2 JP 58136158 A JP58136158 A JP 58136158A JP 13615883 A JP13615883 A JP 13615883A JP H0447895 B2 JPH0447895 B2 JP H0447895B2
Authority
JP
Japan
Prior art keywords
light
spot
detector
light receiving
focus error
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 - Lifetime
Application number
JP58136158A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6028035A (ja
Inventor
Kyoshi Kimoto
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.)
Nikon Corp
Original Assignee
Nippon Kogaku KK
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 Nippon Kogaku KK filed Critical Nippon Kogaku KK
Priority to JP13615883A priority Critical patent/JPS6028035A/ja
Publication of JPS6028035A publication Critical patent/JPS6028035A/ja
Publication of JPH0447895B2 publication Critical patent/JPH0447895B2/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)
  • Optical Recording Or Reproduction (AREA)
JP13615883A 1983-07-26 1983-07-26 光学式情報再生装置のフオ−カス誤差検出装置 Granted JPS6028035A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13615883A JPS6028035A (ja) 1983-07-26 1983-07-26 光学式情報再生装置のフオ−カス誤差検出装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13615883A JPS6028035A (ja) 1983-07-26 1983-07-26 光学式情報再生装置のフオ−カス誤差検出装置

Publications (2)

Publication Number Publication Date
JPS6028035A JPS6028035A (ja) 1985-02-13
JPH0447895B2 true JPH0447895B2 (enExample) 1992-08-05

Family

ID=15168667

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13615883A Granted JPS6028035A (ja) 1983-07-26 1983-07-26 光学式情報再生装置のフオ−カス誤差検出装置

Country Status (1)

Country Link
JP (1) JPS6028035A (enExample)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE68919922T2 (de) * 1988-06-23 1995-06-22 Sharp Kk Optische Abtastvorrichtung.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53121644A (en) * 1977-03-31 1978-10-24 Olympus Optical Co Ltd Detecting method of focal position using holograph

Also Published As

Publication number Publication date
JPS6028035A (ja) 1985-02-13

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