JPH0213374B2 - - Google Patents

Info

Publication number
JPH0213374B2
JPH0213374B2 JP55177024A JP17702480A JPH0213374B2 JP H0213374 B2 JPH0213374 B2 JP H0213374B2 JP 55177024 A JP55177024 A JP 55177024A JP 17702480 A JP17702480 A JP 17702480A JP H0213374 B2 JPH0213374 B2 JP H0213374B2
Authority
JP
Japan
Prior art keywords
focus lens
lens
error signal
focus
optical
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
JP55177024A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57100636A (en
Inventor
Nobuyuki Kaneko
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.)
Kenwood KK
Original Assignee
Kenwood 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 Kenwood KK filed Critical Kenwood KK
Priority to JP17702480A priority Critical patent/JPS57100636A/ja
Publication of JPS57100636A publication Critical patent/JPS57100636A/ja
Publication of JPH0213374B2 publication Critical patent/JPH0213374B2/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

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP17702480A 1980-12-15 1980-12-15 Optical information reader Granted JPS57100636A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17702480A JPS57100636A (en) 1980-12-15 1980-12-15 Optical information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17702480A JPS57100636A (en) 1980-12-15 1980-12-15 Optical information reader

Publications (2)

Publication Number Publication Date
JPS57100636A JPS57100636A (en) 1982-06-22
JPH0213374B2 true JPH0213374B2 (ko) 1990-04-04

Family

ID=16023817

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17702480A Granted JPS57100636A (en) 1980-12-15 1980-12-15 Optical information reader

Country Status (1)

Country Link
JP (1) JPS57100636A (ko)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5914138A (ja) * 1982-07-14 1984-01-25 Minolta Camera Co Ltd 光デイスクのトラツキング制御光学系

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55135340A (en) * 1979-04-06 1980-10-22 Discovision Ass Apparatus for keeping scanning means in place

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55135340A (en) * 1979-04-06 1980-10-22 Discovision Ass Apparatus for keeping scanning means in place

Also Published As

Publication number Publication date
JPS57100636A (en) 1982-06-22

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