JPH0316691B2 - - Google Patents

Info

Publication number
JPH0316691B2
JPH0316691B2 JP3495881A JP3495881A JPH0316691B2 JP H0316691 B2 JPH0316691 B2 JP H0316691B2 JP 3495881 A JP3495881 A JP 3495881A JP 3495881 A JP3495881 A JP 3495881A JP H0316691 B2 JPH0316691 B2 JP H0316691B2
Authority
JP
Japan
Prior art keywords
circuit
light beam
converging
focus control
detection means
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
JP3495881A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57150147A (en
Inventor
Mitsuro Morya
Masahiro Deguchi
Akira Ichinose
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 JP3495881A priority Critical patent/JPS57150147A/ja
Publication of JPS57150147A publication Critical patent/JPS57150147A/ja
Publication of JPH0316691B2 publication Critical patent/JPH0316691B2/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
    • G11B7/0945—Methods for initialising servos, start-up sequences

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Automatic Focus Adjustment (AREA)
JP3495881A 1981-03-10 1981-03-10 Optical type recorder and reproducer Granted JPS57150147A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3495881A JPS57150147A (en) 1981-03-10 1981-03-10 Optical type recorder and reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3495881A JPS57150147A (en) 1981-03-10 1981-03-10 Optical type recorder and reproducer

Publications (2)

Publication Number Publication Date
JPS57150147A JPS57150147A (en) 1982-09-16
JPH0316691B2 true JPH0316691B2 (nl) 1991-03-06

Family

ID=12428654

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3495881A Granted JPS57150147A (en) 1981-03-10 1981-03-10 Optical type recorder and reproducer

Country Status (1)

Country Link
JP (1) JPS57150147A (nl)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6052933A (ja) * 1983-09-02 1985-03-26 Nippon Kogaku Kk <Nikon> 光デイスク装置のフオ−カスサ−ボ引込み装置
JPS61122934A (ja) * 1984-11-16 1986-06-10 Matsushita Electric Ind Co Ltd 焦点位置制御装置
JPH01162110U (nl) * 1988-04-27 1989-11-10
US5477514A (en) * 1993-09-07 1995-12-19 Matsushita Electric Industrial Co., Ltd. Control apparatus for controlling focusing, accessing and spindle rotating circuits to operate simultaneously
KR100462259B1 (ko) * 1995-10-18 2005-04-06 소니 가부시끼 가이샤 디스크와대물렌즈사이의상대적인위치관계에기초한포커스구동회로및포커스서치방법
KR100470027B1 (ko) * 2001-06-15 2005-02-04 엘지전자 주식회사 반사표면을 갖는 고밀도 광디스크 및 그 구동방법

Also Published As

Publication number Publication date
JPS57150147A (en) 1982-09-16

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