DE3877417T2 - Optische lesekopfvorrichtung. - Google Patents

Optische lesekopfvorrichtung.

Info

Publication number
DE3877417T2
DE3877417T2 DE8888304549T DE3877417T DE3877417T2 DE 3877417 T2 DE3877417 T2 DE 3877417T2 DE 8888304549 T DE8888304549 T DE 8888304549T DE 3877417 T DE3877417 T DE 3877417T DE 3877417 T2 DE3877417 T2 DE 3877417T2
Authority
DE
Germany
Prior art keywords
head device
reading head
optical reading
optical
reading
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 - Fee Related
Application number
DE8888304549T
Other languages
English (en)
Other versions
DE3877417D1 (de
Inventor
Satoshi Pioneer Electr Sugiura
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
Application granted granted Critical
Publication of DE3877417D1 publication Critical patent/DE3877417D1/de
Publication of DE3877417T2 publication Critical patent/DE3877417T2/de
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • 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
    • 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
    • G11B7/094—Methods and circuits for servo offset compensation
    • 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
    • G11B7/13—Optical detectors therefor
    • 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
    • G11B7/13—Optical detectors therefor
    • G11B7/133—Shape of individual detector elements
    • 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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1353—Diffractive elements, e.g. holograms or gratings
DE8888304549T 1987-05-19 1988-05-19 Optische lesekopfvorrichtung. Expired - Fee Related DE3877417T2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62121623A JPS63285732A (ja) 1987-05-19 1987-05-19 光学式ピックアップ装置

Publications (2)

Publication Number Publication Date
DE3877417D1 DE3877417D1 (de) 1993-02-25
DE3877417T2 true DE3877417T2 (de) 1993-05-13

Family

ID=14815842

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8888304549T Expired - Fee Related DE3877417T2 (de) 1987-05-19 1988-05-19 Optische lesekopfvorrichtung.

Country Status (4)

Country Link
US (1) US4847478A (de)
EP (1) EP0292289B1 (de)
JP (1) JPS63285732A (de)
DE (1) DE3877417T2 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4970710A (en) * 1987-07-29 1990-11-13 Laser Magnetic Storage International Company Method and apparatus for focus and tracking in an optical disk system
JPH0770065B2 (ja) * 1988-04-20 1995-07-31 シャープ株式会社 光ピックアップ装置
US5511050A (en) * 1988-09-21 1996-04-23 Hitachi, Ltd. Focus error detecting method and optical head using the same
EP0569597B1 (de) * 1991-11-20 1998-07-15 Sony Corporation Gerät für optische platten
JP3175326B2 (ja) * 1992-08-28 2001-06-11 凸版印刷株式会社 光情報記録媒体およびその情報読取り方法
US6563101B1 (en) 2000-01-19 2003-05-13 Barclay J. Tullis Non-rectilinear sensor arrays for tracking an image
US6967908B2 (en) * 2000-09-07 2005-11-22 Pioneer Corporation Optical pickup device with focus error detecting optical element and method for focus error detection
JP2009110558A (ja) * 2007-10-26 2009-05-21 Sanyo Electric Co Ltd 光ピックアップ装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59125727U (ja) * 1983-02-15 1984-08-24 パイオニア株式会社 光学式情報ピツクアツプ装置
JPS6055521A (ja) * 1983-09-05 1985-03-30 Mitsubishi Electric Corp 光デイスクヘツドの自動焦点調節装置
US4742218A (en) * 1985-03-11 1988-05-03 Hitachi, Ltd. Focus error detection apparatus utilizing focusing an front and rear sides of focal planes
JPH0770088B2 (ja) * 1986-12-18 1995-07-31 キヤノン電子株式会社 光検出器

Also Published As

Publication number Publication date
US4847478A (en) 1989-07-11
JPS63285732A (ja) 1988-11-22
EP0292289A3 (en) 1990-03-28
EP0292289B1 (de) 1993-01-13
EP0292289A2 (de) 1988-11-23
DE3877417D1 (de) 1993-02-25

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8320 Willingness to grant licences declared (paragraph 23)
8339 Ceased/non-payment of the annual fee