JPH0423329B2 - - Google Patents

Info

Publication number
JPH0423329B2
JPH0423329B2 JP6294882A JP6294882A JPH0423329B2 JP H0423329 B2 JPH0423329 B2 JP H0423329B2 JP 6294882 A JP6294882 A JP 6294882A JP 6294882 A JP6294882 A JP 6294882A JP H0423329 B2 JPH0423329 B2 JP H0423329B2
Authority
JP
Japan
Prior art keywords
focus
optical head
objective lens
signal
point
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
JP6294882A
Other languages
English (en)
Japanese (ja)
Other versions
JPS58179947A (ja
Inventor
Hiroshige Kodama
Masaharu Sakamoto
Ken Ooshima
Seiji Yoshikawa
Kunio Yamamya
Kiichi Kato
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP6294882A priority Critical patent/JPS58179947A/ja
Priority to DE19833313784 priority patent/DE3313784A1/de
Publication of JPS58179947A publication Critical patent/JPS58179947A/ja
Publication of JPH0423329B2 publication Critical patent/JPH0423329B2/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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/40—Optical focusing aids
    • 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

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Optical Head (AREA)
JP6294882A 1982-04-15 1982-04-15 光情報再生装置における合焦検出方式 Granted JPS58179947A (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP6294882A JPS58179947A (ja) 1982-04-15 1982-04-15 光情報再生装置における合焦検出方式
DE19833313784 DE3313784A1 (de) 1982-04-15 1983-04-15 Vorrichtung mit optischer kopfanordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6294882A JPS58179947A (ja) 1982-04-15 1982-04-15 光情報再生装置における合焦検出方式

Publications (2)

Publication Number Publication Date
JPS58179947A JPS58179947A (ja) 1983-10-21
JPH0423329B2 true JPH0423329B2 (enrdf_load_stackoverflow) 1992-04-22

Family

ID=13215036

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6294882A Granted JPS58179947A (ja) 1982-04-15 1982-04-15 光情報再生装置における合焦検出方式

Country Status (2)

Country Link
JP (1) JPS58179947A (enrdf_load_stackoverflow)
DE (1) DE3313784A1 (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3410149A1 (de) * 1984-03-20 1985-10-03 Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn Optisches messgeraet
JPS61122934A (ja) * 1984-11-16 1986-06-10 Matsushita Electric Ind Co Ltd 焦点位置制御装置
DE3536700C3 (de) * 1985-10-15 1994-07-07 Focus Mestechnik Gmbh & Co Kg Gerät zum Ermitteln des lokalen Abstandes einer Prüffläche von einer Referenzfläche, deren geometrische Lage in bezug auf das Gerät bekannt ist
DE3710323A1 (de) * 1987-03-28 1988-10-06 Petry Harald Verfahren zur photothermischen materialpruefung mit dem mirage-effekt an proben mit rauhen oder unebenen oberflaechen
DE3840998A1 (de) * 1988-12-06 1990-06-07 Battelle Institut E V Vorrichtung zum zerstoerungsfreien aufspueren von inhomogenitaeten in elastischen werkstoffen
KR100189899B1 (ko) * 1996-02-14 1999-06-01 윤종용 두께가 다른 광 디스크의 판별 방법 및 이를 적용한 광학장치

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL164689C (nl) * 1975-03-10 1981-01-15 Philips Nv Optische focusseerinrichting voor het focusseren van een stralingsbundel.
NL8003729A (nl) * 1980-06-27 1982-01-18 Philips Nv Inrichting voor optische scherpstelling.

Also Published As

Publication number Publication date
DE3313784A1 (de) 1983-10-20
JPS58179947A (ja) 1983-10-21
DE3313784C2 (enrdf_load_stackoverflow) 1990-09-06

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