JPH0470698B2 - - Google Patents

Info

Publication number
JPH0470698B2
JPH0470698B2 JP59242929A JP24292984A JPH0470698B2 JP H0470698 B2 JPH0470698 B2 JP H0470698B2 JP 59242929 A JP59242929 A JP 59242929A JP 24292984 A JP24292984 A JP 24292984A JP H0470698 B2 JPH0470698 B2 JP H0470698B2
Authority
JP
Japan
Prior art keywords
photodetector
reference level
comparator
disk
focus position
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
JP59242929A
Other languages
English (en)
Japanese (ja)
Other versions
JPS61122934A (ja
Inventor
Tsuneo Takahashi
Seizo Tsuji
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 JP24292984A priority Critical patent/JPS61122934A/ja
Publication of JPS61122934A publication Critical patent/JPS61122934A/ja
Publication of JPH0470698B2 publication Critical patent/JPH0470698B2/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
    • 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)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
JP24292984A 1984-11-16 1984-11-16 焦点位置制御装置 Granted JPS61122934A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24292984A JPS61122934A (ja) 1984-11-16 1984-11-16 焦点位置制御装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24292984A JPS61122934A (ja) 1984-11-16 1984-11-16 焦点位置制御装置

Publications (2)

Publication Number Publication Date
JPS61122934A JPS61122934A (ja) 1986-06-10
JPH0470698B2 true JPH0470698B2 (en]) 1992-11-11

Family

ID=17096312

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24292984A Granted JPS61122934A (ja) 1984-11-16 1984-11-16 焦点位置制御装置

Country Status (1)

Country Link
JP (1) JPS61122934A (en])

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0775076B2 (ja) * 1986-10-24 1995-08-09 パイオニア株式会社 フオ−カスサ−ボ引込装置
JPH0664744B2 (ja) * 1986-11-19 1994-08-22 松下電送株式会社 光デイスク装置のフオ−カスサ−ボ装置
FR2770324B1 (fr) * 1997-10-29 2000-01-28 Atg Sa Procede et dispositif de fermeture de la boucle de focalisation d'un lecteur-enregistreur de disque optique
JP2008140442A (ja) * 2006-11-30 2008-06-19 Toshiba Corp 光ディスク装置及びフォーカス制御方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5694528A (en) * 1979-12-28 1981-07-31 Matsushita Electric Ind Co Ltd Drawing-in method of focus servo
JPS57150147A (en) * 1981-03-10 1982-09-16 Matsushita Electric Ind Co Ltd Optical type recorder and reproducer
JPS58179947A (ja) * 1982-04-15 1983-10-21 Olympus Optical Co Ltd 光情報再生装置における合焦検出方式

Also Published As

Publication number Publication date
JPS61122934A (ja) 1986-06-10

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees