DE3635143C2 - - Google Patents

Info

Publication number
DE3635143C2
DE3635143C2 DE3635143A DE3635143A DE3635143C2 DE 3635143 C2 DE3635143 C2 DE 3635143C2 DE 3635143 A DE3635143 A DE 3635143A DE 3635143 A DE3635143 A DE 3635143A DE 3635143 C2 DE3635143 C2 DE 3635143C2
Authority
DE
Germany
Prior art keywords
prism
light
light source
focus detection
detection device
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
DE3635143A
Other languages
German (de)
English (en)
Other versions
DE3635143A1 (de
Inventor
Yasuo Iruma Saitama Jp Nakamura
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.)
Canon Electronics Inc
Original Assignee
Canon Electronics Inc
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
Priority claimed from JP60230387A external-priority patent/JPH063647B2/ja
Priority claimed from JP60230386A external-priority patent/JP2584739B2/ja
Application filed by Canon Electronics Inc filed Critical Canon Electronics Inc
Publication of DE3635143A1 publication Critical patent/DE3635143A1/de
Application granted granted Critical
Publication of DE3635143C2 publication Critical patent/DE3635143C2/de
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
    • G11B7/0908—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
    • G11B7/0909—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 by astigmatic methods
    • 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
    • G02B27/10—Beam splitting or combining systems
    • G02B27/16—Beam splitting or combining systems used as aids for focusing
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
DE19863635143 1985-10-16 1986-10-15 Fokusermittlungsvorrichtung Granted DE3635143A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP60230387A JPH063647B2 (ja) 1985-10-16 1985-10-16 焦点検出装置
JP60230386A JP2584739B2 (ja) 1985-10-16 1985-10-16 焦点検出装置

Publications (2)

Publication Number Publication Date
DE3635143A1 DE3635143A1 (de) 1987-04-16
DE3635143C2 true DE3635143C2 (en, 2012) 1990-06-07

Family

ID=26529314

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19863635143 Granted DE3635143A1 (de) 1985-10-16 1986-10-15 Fokusermittlungsvorrichtung

Country Status (5)

Country Link
US (1) US4778984A (en, 2012)
DE (1) DE3635143A1 (en, 2012)
FR (1) FR2588671A1 (en, 2012)
GB (1) GB2183957B (en, 2012)
NL (1) NL8602596A (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19645110A1 (de) * 1996-11-01 1998-05-07 Thomson Brandt Gmbh Aufzeichnungs- oder Wiedergabegerät und Verfahren zum Erkennen eines Fokussierungszustands

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5202867A (en) * 1987-01-29 1993-04-13 Canon Kabushiki Kaisha Condensing optical system with corrected chromatic aberration, and information recording/reproducing apparatus using this optical system
US4954702A (en) * 1987-10-14 1990-09-04 Konica Corporation Process for detecting a focal point in an optical head
JPH02201741A (ja) * 1989-01-31 1990-08-09 Toshiba Corp フォーカス検出装置
JP2779229B2 (ja) * 1989-09-29 1998-07-23 パイオニア株式会社 非点収差発生装置
US5216562A (en) * 1990-09-25 1993-06-01 International Business Machines Corporation Multi-beam optical recording system and method
DE69208413T2 (de) * 1991-08-22 1996-11-14 Kla Instr Corp Gerät zur automatischen Prüfung von Photomaske
JPH0619125U (ja) * 1992-07-25 1994-03-11 株式会社三協精機製作所 光ピックアップ装置
EP0749119A3 (en) * 1995-05-31 1997-08-20 Daewoo Electronics Co Ltd Optical reading device
JPH10333025A (ja) * 1997-05-28 1998-12-18 Pioneer Electron Corp 光ピックアップ装置
US6831886B1 (en) * 1998-11-27 2004-12-14 Minolta Co., Ltd. Optical head and optical head device
CA2392486A1 (en) * 2002-07-05 2002-12-08 Duchesnay Inc. Pharmaceutical dosage form bearing pregnancy-friendly indicia
GB2414294B (en) * 2004-05-20 2006-08-02 Teraview Ltd Apparatus and method for investigating a sample
JP5409028B2 (ja) * 2009-01-30 2014-02-05 キヤノン株式会社 分割光学系及びそれを用いた撮像光学系、撮像装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4079247A (en) * 1975-05-16 1978-03-14 Claude Bricot Optical focussing device
JPS567246A (en) * 1979-06-25 1981-01-24 Olympus Optical Co Ltd Method and unit for focus detection
GB2057218B (en) * 1979-06-25 1984-02-29 Olympus Optical Co Detecting focussing error
NL7907216A (nl) * 1979-09-28 1981-03-31 Philips Nv Optisch fokusfout-detektiestelsel.
JPS5694528A (en) * 1979-12-28 1981-07-31 Matsushita Electric Ind Co Ltd Drawing-in method of focus servo
US4376303A (en) * 1980-12-19 1983-03-08 Rca Corporation Quasi-zoom lens optical focus sensor
US4505584A (en) * 1981-01-22 1985-03-19 Olympus Optical Co., Ltd. Method and apparatus for detecting focussing error signal of objective lens
FR2502800A1 (fr) * 1981-03-24 1982-10-01 Thomson Csf Senseur optique d'asservissement de focalisation
JPS60626A (ja) * 1983-06-15 1985-01-05 Mitsubishi Electric Corp 光ピツクアツプ
JPS629537A (ja) * 1985-07-08 1987-01-17 Pioneer Electronic Corp 光学式ピツクアツプ装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19645110A1 (de) * 1996-11-01 1998-05-07 Thomson Brandt Gmbh Aufzeichnungs- oder Wiedergabegerät und Verfahren zum Erkennen eines Fokussierungszustands
US6249493B1 (en) 1996-11-01 2001-06-19 Deutsche Thomson-Brandt Gmbh Recording or replay device and method for recognition of a focussing status

Also Published As

Publication number Publication date
NL8602596A (nl) 1987-05-18
GB8624665D0 (en) 1986-11-19
GB2183957A (en) 1987-06-10
DE3635143A1 (de) 1987-04-16
GB2183957B (en) 1990-03-28
FR2588671A1 (fr) 1987-04-17
US4778984A (en) 1988-10-18
FR2588671B1 (en, 2012) 1993-02-26

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee