JPS6161238A - フオ−カス引き込み方式 - Google Patents

フオ−カス引き込み方式

Info

Publication number
JPS6161238A
JPS6161238A JP18321184A JP18321184A JPS6161238A JP S6161238 A JPS6161238 A JP S6161238A JP 18321184 A JP18321184 A JP 18321184A JP 18321184 A JP18321184 A JP 18321184A JP S6161238 A JPS6161238 A JP S6161238A
Authority
JP
Japan
Prior art keywords
focus
error signal
signal
condenser lens
detector
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.)
Granted
Application number
JP18321184A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0518183B2 (de
Inventor
Masaharu Moritsugu
森次　政春
Yasuyuki Ozawa
靖之 小沢
Akio Nimata
彰男 二俣
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 true JPS6161238A (ja) 1986-03-29
JPH0518183B2 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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61158035A (ja) * 1984-12-28 1986-07-17 Ricoh Co Ltd 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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61158035A (ja) * 1984-12-28 1986-07-17 Ricoh Co Ltd 光情報検出装置

Also Published As

Publication number Publication date
JPH0518183B2 (de) 1993-03-11

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term