JPH0415533B2 - - Google Patents

Info

Publication number
JPH0415533B2
JPH0415533B2 JP8176084A JP8176084A JPH0415533B2 JP H0415533 B2 JPH0415533 B2 JP H0415533B2 JP 8176084 A JP8176084 A JP 8176084A JP 8176084 A JP8176084 A JP 8176084A JP H0415533 B2 JPH0415533 B2 JP H0415533B2
Authority
JP
Japan
Prior art keywords
objective lens
signal
phase
photodetector
distance
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
JP8176084A
Other languages
English (en)
Japanese (ja)
Other versions
JPS605433A (ja
Inventor
Shigeo Kato
Takeshi Maeda
Seiji Yonezawa
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 JP8176084A priority Critical patent/JPS605433A/ja
Publication of JPS605433A publication Critical patent/JPS605433A/ja
Publication of JPH0415533B2 publication Critical patent/JPH0415533B2/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)
JP8176084A 1984-04-25 1984-04-25 光学的情報処理装置 Granted JPS605433A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8176084A JPS605433A (ja) 1984-04-25 1984-04-25 光学的情報処理装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8176084A JPS605433A (ja) 1984-04-25 1984-04-25 光学的情報処理装置

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP3796674A Division JPS50132939A (fr) 1973-11-09 1974-04-05

Publications (2)

Publication Number Publication Date
JPS605433A JPS605433A (ja) 1985-01-12
JPH0415533B2 true JPH0415533B2 (fr) 1992-03-18

Family

ID=13755402

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8176084A Granted JPS605433A (ja) 1984-04-25 1984-04-25 光学的情報処理装置

Country Status (1)

Country Link
JP (1) JPS605433A (fr)

Also Published As

Publication number Publication date
JPS605433A (ja) 1985-01-12

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