DE3382580D1 - OPTICAL FOCUSING ADJUSTMENT DEVICE. - Google Patents

OPTICAL FOCUSING ADJUSTMENT DEVICE.

Info

Publication number
DE3382580D1
DE3382580D1 DE8888119199T DE3382580T DE3382580D1 DE 3382580 D1 DE3382580 D1 DE 3382580D1 DE 8888119199 T DE8888119199 T DE 8888119199T DE 3382580 T DE3382580 T DE 3382580T DE 3382580 D1 DE3382580 D1 DE 3382580D1
Authority
DE
Germany
Prior art keywords
adjustment device
optical focusing
focusing adjustment
optical
focusing
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
DE8888119199T
Other languages
German (de)
Other versions
DE3382580T2 (en
Inventor
Yoshikazu Fujii
Toshihisa Deguchi
Tetsuya Inui
Hideyoshi Yamaoka
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.)
Sharp Corp
Original Assignee
Sharp 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
Priority claimed from JP1103783A external-priority patent/JPS59139154A/en
Priority claimed from JP6877083A external-priority patent/JPS59193551A/en
Priority claimed from JP6961983A external-priority patent/JPS59195336A/en
Application filed by Sharp Corp filed Critical Sharp Corp
Priority claimed from EP83305435A external-priority patent/EP0115666B1/en
Application granted granted Critical
Publication of DE3382580D1 publication Critical patent/DE3382580D1/en
Publication of DE3382580T2 publication Critical patent/DE3382580T2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/093—Electromechanical actuators for lens positioning for focusing and tracking
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
    • G11B11/10504—Recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to the carrier
    • 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
DE8888119199T 1983-01-25 1983-09-15 OPTICAL FOCUSING ADJUSTMENT DEVICE. Expired - Lifetime DE3382580T2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP1103783A JPS59139154A (en) 1983-01-25 1983-01-25 Device for controlling position of light focusing
JP6877083A JPS59193551A (en) 1983-04-18 1983-04-18 Controller for light focusing position
JP6961983A JPS59195336A (en) 1983-04-19 1983-04-19 Controller for light condensing position
EP83305435A EP0115666B1 (en) 1983-01-25 1983-09-15 Optical focus position control in optical disc apparatus

Publications (2)

Publication Number Publication Date
DE3382580D1 true DE3382580D1 (en) 1992-07-16
DE3382580T2 DE3382580T2 (en) 1992-12-03

Family

ID=27440557

Family Applications (2)

Application Number Title Priority Date Filing Date
DE8888119199T Expired - Lifetime DE3382580T2 (en) 1983-01-25 1983-09-15 OPTICAL FOCUSING ADJUSTMENT DEVICE.
DE8888119198T Expired - Lifetime DE3382609T2 (en) 1983-01-25 1983-09-15 OPTICAL FOCUSING ADJUSTMENT DEVICE.

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE8888119198T Expired - Lifetime DE3382609T2 (en) 1983-01-25 1983-09-15 OPTICAL FOCUSING ADJUSTMENT DEVICE.

Country Status (1)

Country Link
DE (2) DE3382580T2 (en)

Also Published As

Publication number Publication date
DE3382609T2 (en) 1992-12-03
DE3382580T2 (en) 1992-12-03
DE3382609D1 (en) 1992-09-17

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition