JPH0353699B2 - - Google Patents

Info

Publication number
JPH0353699B2
JPH0353699B2 JP21818082A JP21818082A JPH0353699B2 JP H0353699 B2 JPH0353699 B2 JP H0353699B2 JP 21818082 A JP21818082 A JP 21818082A JP 21818082 A JP21818082 A JP 21818082A JP H0353699 B2 JPH0353699 B2 JP H0353699B2
Authority
JP
Japan
Prior art keywords
lens
quadrants
photodetector
detection
axis
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
JP21818082A
Other languages
English (en)
Japanese (ja)
Other versions
JPS59110042A (ja
Inventor
Shigeo Kubota
Kyoshi Oosato
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP21818082A priority Critical patent/JPS59110042A/ja
Publication of JPS59110042A publication Critical patent/JPS59110042A/ja
Publication of JPH0353699B2 publication Critical patent/JPH0353699B2/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)
JP21818082A 1982-12-13 1982-12-13 フオ−カス誤差検出装置 Granted JPS59110042A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21818082A JPS59110042A (ja) 1982-12-13 1982-12-13 フオ−カス誤差検出装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21818082A JPS59110042A (ja) 1982-12-13 1982-12-13 フオ−カス誤差検出装置

Publications (2)

Publication Number Publication Date
JPS59110042A JPS59110042A (ja) 1984-06-25
JPH0353699B2 true JPH0353699B2 (de) 1991-08-15

Family

ID=16715863

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21818082A Granted JPS59110042A (ja) 1982-12-13 1982-12-13 フオ−カス誤差検出装置

Country Status (1)

Country Link
JP (1) JPS59110042A (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6452231A (en) * 1987-08-24 1989-02-28 Matsushita Electric Industrial Co Ltd Optical disk device
JPH01205734A (ja) * 1988-02-12 1989-08-18 Matsushita Electric Ind Co Ltd 光ヘッド装置

Also Published As

Publication number Publication date
JPS59110042A (ja) 1984-06-25

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