DE3538314C2 - - Google Patents

Info

Publication number
DE3538314C2
DE3538314C2 DE3538314A DE3538314A DE3538314C2 DE 3538314 C2 DE3538314 C2 DE 3538314C2 DE 3538314 A DE3538314 A DE 3538314A DE 3538314 A DE3538314 A DE 3538314A DE 3538314 C2 DE3538314 C2 DE 3538314C2
Authority
DE
Germany
Prior art keywords
light
elements
tan
reflected
receiving element
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
DE3538314A
Other languages
German (de)
English (en)
Other versions
DE3538314A1 (de
Inventor
Takanori Tokorozawa Saitama Jp Maeda
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Publication of DE3538314A1 publication Critical patent/DE3538314A1/de
Application granted granted Critical
Publication of DE3538314C2 publication Critical patent/DE3538314C2/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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • 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
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
    • G11B2007/0919—Critical angle methods

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
DE19853538314 1984-10-29 1985-10-28 Fokusregeleinrichtung Granted DE3538314A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59227441A JPS61105736A (ja) 1984-10-29 1984-10-29 フオ−カス制御装置

Publications (2)

Publication Number Publication Date
DE3538314A1 DE3538314A1 (de) 1986-04-30
DE3538314C2 true DE3538314C2 (en, 2012) 1987-10-29

Family

ID=16860911

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853538314 Granted DE3538314A1 (de) 1984-10-29 1985-10-28 Fokusregeleinrichtung

Country Status (4)

Country Link
US (1) US4691098A (en, 2012)
JP (1) JPS61105736A (en, 2012)
DE (1) DE3538314A1 (en, 2012)
GB (1) GB2168563B (en, 2012)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4998011A (en) * 1989-11-17 1991-03-05 Applied Magnetics Corporation Flat plate focus sensing apparatus
GB2248989B (en) * 1990-10-15 1995-05-24 Applied Magnetics Corp Focus sensing apparatus and method
US5245174A (en) * 1990-10-15 1993-09-14 Applied Magnetics Corporation Focus sensing apparatus utilizing a reflecting surface having variable reflectivity
US5646778A (en) * 1991-05-28 1997-07-08 Discovision Associates Optical beamsplitter
US5331622A (en) * 1991-05-28 1994-07-19 Applied Magnetics Corporation Compact optical head

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3023779A1 (de) * 1979-06-25 1981-02-05 Olympus Optical Co Verfahren zum feststellen der scharfeinstellung eines objektivs in bezug auf einen gegenstand und vorrichtung zur durchfuehrung des verfahrens
DE3132804A1 (de) * 1980-08-19 1982-04-29 Olympus Optical Co., Ltd., Tokyo Verfahren zum erfassen eines fokussierzustandes eines objektivs zur abtastung von videoplatten und vorrichtung zur durchfuehrung dieses verfahrens
DE3201964A1 (de) * 1981-01-22 1982-09-23 Olympus Optical Co., Ltd., Tokyo Verfahren zum feststellen der scharfeinstellung eines objektivs in bezug auf einen gegenstand und vorrichtung zur durchfuehrung des verfahrens
EP0070552A2 (en) * 1981-07-20 1983-01-26 Kabushiki Kaisha Toshiba Optical head

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS573235A (en) * 1980-06-07 1982-01-08 Ricoh Co Ltd Focus controlling method
US4504938A (en) * 1981-04-07 1985-03-12 Victor Company Of Japan, Limited Device for feedback controlling focus of an optical system in an information recording/reproducing apparatus
JPS5829151A (ja) * 1981-08-12 1983-02-21 Nec Corp 光学的記録再生装置における焦点誤差検出装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3023779A1 (de) * 1979-06-25 1981-02-05 Olympus Optical Co Verfahren zum feststellen der scharfeinstellung eines objektivs in bezug auf einen gegenstand und vorrichtung zur durchfuehrung des verfahrens
DE3132804A1 (de) * 1980-08-19 1982-04-29 Olympus Optical Co., Ltd., Tokyo Verfahren zum erfassen eines fokussierzustandes eines objektivs zur abtastung von videoplatten und vorrichtung zur durchfuehrung dieses verfahrens
DE3201964A1 (de) * 1981-01-22 1982-09-23 Olympus Optical Co., Ltd., Tokyo Verfahren zum feststellen der scharfeinstellung eines objektivs in bezug auf einen gegenstand und vorrichtung zur durchfuehrung des verfahrens
EP0070552A2 (en) * 1981-07-20 1983-01-26 Kabushiki Kaisha Toshiba Optical head

Also Published As

Publication number Publication date
GB2168563B (en) 1987-08-12
GB2168563A (en) 1986-06-18
JPS61105736A (ja) 1986-05-23
US4691098A (en) 1987-09-01
JPH056258B2 (en, 2012) 1993-01-26
DE3538314A1 (de) 1986-04-30
GB8526623D0 (en) 1985-12-04

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Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8110 Request for examination paragraph 44
D2 Grant after examination
8320 Willingness to grant licences declared (paragraph 23)
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee