JPH0421252B2 - - Google Patents

Info

Publication number
JPH0421252B2
JPH0421252B2 JP22873383A JP22873383A JPH0421252B2 JP H0421252 B2 JPH0421252 B2 JP H0421252B2 JP 22873383 A JP22873383 A JP 22873383A JP 22873383 A JP22873383 A JP 22873383A JP H0421252 B2 JPH0421252 B2 JP H0421252B2
Authority
JP
Japan
Prior art keywords
record carrier
light beam
signal
control
convergence state
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
JP22873383A
Other languages
English (en)
Japanese (ja)
Other versions
JPS60121538A (ja
Inventor
Mitsuro Morya
Kazuharu Shiragami
Hiroyuki Yamaguchi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP22873383A priority Critical patent/JPS60121538A/ja
Publication of JPS60121538A publication Critical patent/JPS60121538A/ja
Publication of JPH0421252B2 publication Critical patent/JPH0421252B2/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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • G11B33/08—Insulation or absorption of undesired vibrations or sounds

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP22873383A 1983-12-02 1983-12-02 フォ−カス制御装置 Granted JPS60121538A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22873383A JPS60121538A (ja) 1983-12-02 1983-12-02 フォ−カス制御装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22873383A JPS60121538A (ja) 1983-12-02 1983-12-02 フォ−カス制御装置

Publications (2)

Publication Number Publication Date
JPS60121538A JPS60121538A (ja) 1985-06-29
JPH0421252B2 true JPH0421252B2 (enrdf_load_stackoverflow) 1992-04-09

Family

ID=16880956

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22873383A Granted JPS60121538A (ja) 1983-12-02 1983-12-02 フォ−カス制御装置

Country Status (1)

Country Link
JP (1) JPS60121538A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8502635A (nl) * 1985-09-27 1987-04-16 Philips Nv Inrichting voor het uitlezen van informatie op een registratiedrager.

Also Published As

Publication number Publication date
JPS60121538A (ja) 1985-06-29

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