JPH0518183B2 - - Google Patents

Info

Publication number
JPH0518183B2
JPH0518183B2 JP59183211A JP18321184A JPH0518183B2 JP H0518183 B2 JPH0518183 B2 JP H0518183B2 JP 59183211 A JP59183211 A JP 59183211A JP 18321184 A JP18321184 A JP 18321184A JP H0518183 B2 JPH0518183 B2 JP H0518183B2
Authority
JP
Japan
Prior art keywords
focus
error signal
detector
signal
recording medium
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
JP59183211A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6161238A (ja
Inventor
Masaharu Moritsugu
Yasuyuki Ozawa
Akio Nimata
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP18321184A priority Critical patent/JPS6161238A/ja
Publication of JPS6161238A publication Critical patent/JPS6161238A/ja
Publication of JPH0518183B2 publication Critical patent/JPH0518183B2/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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
JP18321184A 1984-08-31 1984-08-31 フオ−カス引き込み方式 Granted JPS6161238A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18321184A JPS6161238A (ja) 1984-08-31 1984-08-31 フオ−カス引き込み方式

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18321184A JPS6161238A (ja) 1984-08-31 1984-08-31 フオ−カス引き込み方式

Publications (2)

Publication Number Publication Date
JPS6161238A JPS6161238A (ja) 1986-03-29
JPH0518183B2 true JPH0518183B2 (de) 1993-03-11

Family

ID=16131721

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18321184A Granted JPS6161238A (ja) 1984-08-31 1984-08-31 フオ−カス引き込み方式

Country Status (1)

Country Link
JP (1) JPS6161238A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0610876B2 (ja) * 1984-12-28 1994-02-09 株式会社リコー 光情報検出装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5885940A (ja) * 1981-11-17 1983-05-23 Hitachi Ltd 光デイスクの自動焦点引込み方法
JPS6035337A (ja) * 1983-08-03 1985-02-23 Sony Corp 光記録／再生装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5885940A (ja) * 1981-11-17 1983-05-23 Hitachi Ltd 光デイスクの自動焦点引込み方法
JPS6035337A (ja) * 1983-08-03 1985-02-23 Sony Corp 光記録／再生装置

Also Published As

Publication number Publication date
JPS6161238A (ja) 1986-03-29

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term