GB2307549B - Optical pick-up device - Google Patents

Optical pick-up device

Info

Publication number
GB2307549B
GB2307549B GB9523939A GB9523939A GB2307549B GB 2307549 B GB2307549 B GB 2307549B GB 9523939 A GB9523939 A GB 9523939A GB 9523939 A GB9523939 A GB 9523939A GB 2307549 B GB2307549 B GB 2307549B
Authority
GB
United Kingdom
Prior art keywords
optical pick
pick
optical
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
GB9523939A
Other versions
GB9523939D0 (en
GB2307549A (en
Inventor
Yoshiharu Chikazawa
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.)
Vantiva SA
Original Assignee
Thomson Multimedia SA
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 Thomson Multimedia SA filed Critical Thomson Multimedia SA
Priority to GB9523939A priority Critical patent/GB2307549B/en
Publication of GB9523939D0 publication Critical patent/GB9523939D0/en
Publication of GB2307549A publication Critical patent/GB2307549A/en
Application granted granted Critical
Publication of GB2307549B publication Critical patent/GB2307549B/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G11B7/1359—Single prisms
    • 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
    • G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
    • G11B7/0956—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
    • 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
    • G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive 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
    • G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
    • G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
    • G11B7/13927—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means during transducing, e.g. to correct for variation of the spherical aberration due to disc tilt or irregularities in the cover layer thickness
    • 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
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)
GB9523939A 1995-11-23 1995-11-23 Optical pick-up device Expired - Lifetime GB2307549B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9523939A GB2307549B (en) 1995-11-23 1995-11-23 Optical pick-up device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9523939A GB2307549B (en) 1995-11-23 1995-11-23 Optical pick-up device

Publications (3)

Publication Number Publication Date
GB9523939D0 GB9523939D0 (en) 1996-01-24
GB2307549A GB2307549A (en) 1997-05-28
GB2307549B true GB2307549B (en) 1999-10-20

Family

ID=10784318

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9523939A Expired - Lifetime GB2307549B (en) 1995-11-23 1995-11-23 Optical pick-up device

Country Status (1)

Country Link
GB (1) GB2307549B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080205242A1 (en) * 2005-05-03 2008-08-28 Koninklijke Philips Electronics, N.V. Multi-Radiation Beam Optical Scanning Device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985952A (en) * 1974-02-04 1976-10-12 Zenith Radio Corporation Elasto-optic device for spot wobble in a video disc player
US4569039A (en) * 1981-07-13 1986-02-04 Canon Kabushiki Kaisha Optical information output device
US4840473A (en) * 1985-09-27 1989-06-20 Canon Kabushiki Kaisha Optical device
EP0455249A2 (en) * 1990-05-02 1991-11-06 Hitachi, Ltd. Automatic focusing apparatus and method
EP0545133A2 (en) * 1991-11-20 1993-06-09 Sony Corporation Optical pickup device and focusing servo device employed therein
US5291567A (en) * 1992-07-21 1994-03-01 Eastman Kodak Company Electro-optic waveguide deflector using a nonlinear optic film or liquid-crystal overlay cell for use in an optical pickup head

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985952A (en) * 1974-02-04 1976-10-12 Zenith Radio Corporation Elasto-optic device for spot wobble in a video disc player
US4569039A (en) * 1981-07-13 1986-02-04 Canon Kabushiki Kaisha Optical information output device
US4840473A (en) * 1985-09-27 1989-06-20 Canon Kabushiki Kaisha Optical device
EP0455249A2 (en) * 1990-05-02 1991-11-06 Hitachi, Ltd. Automatic focusing apparatus and method
EP0545133A2 (en) * 1991-11-20 1993-06-09 Sony Corporation Optical pickup device and focusing servo device employed therein
US5291567A (en) * 1992-07-21 1994-03-01 Eastman Kodak Company Electro-optic waveguide deflector using a nonlinear optic film or liquid-crystal overlay cell for use in an optical pickup head

Also Published As

Publication number Publication date
GB9523939D0 (en) 1996-01-24
GB2307549A (en) 1997-05-28

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Legal Events

Date Code Title Description
746 Register noted 'licences of right' (sect. 46/1977)

Effective date: 20010813

PE20 Patent expired after termination of 20 years

Expiry date: 20151122