NO912838D0 - OPTICAL SCANNING DEVICE. - Google Patents

OPTICAL SCANNING DEVICE.

Info

Publication number
NO912838D0
NO912838D0 NO912838A NO912838A NO912838D0 NO 912838 D0 NO912838 D0 NO 912838D0 NO 912838 A NO912838 A NO 912838A NO 912838 A NO912838 A NO 912838A NO 912838 D0 NO912838 D0 NO 912838D0
Authority
NO
Norway
Prior art keywords
disk
data
objective lens
scanning device
light beam
Prior art date
Application number
NO912838A
Other languages
Norwegian (no)
Other versions
NO912838L (en
Inventor
Yasuaki Morimoto
Friedhelm Zucker
Heinz-Joerg Schroeder
Christian Buechler
Gerhard Weissmann
Original Assignee
Thomson Brandt Gmbh
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 DE19893901574 external-priority patent/DE3901574A1/en
Priority claimed from DE3942943A external-priority patent/DE3942943A1/en
Application filed by Thomson Brandt Gmbh filed Critical Thomson Brandt Gmbh
Publication of NO912838D0 publication Critical patent/NO912838D0/en
Publication of NO912838L publication Critical patent/NO912838L/en

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
    • 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
    • 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
    • G11B7/0901—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 track following only
    • G11B7/0903—Multi-beam tracking systems
    • 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
    • G11B7/135—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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
  • Vehicle Body Suspensions (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Microscoopes, Condenser (AREA)
  • Holo Graphy (AREA)
  • Optical Communication System (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

Optical scanning device with an objective lens. In a recording and/or reproducing device which reads data from an optical record carrier, e.g. a disk, by the single-beam process, the entire optical scanning device is moved in order to direct the light beam onto the data tracks on the disk. Fine adjustment solely by moving the objective lens in the radial direction, as in the triple-beam process, is not possible, because the light spot follows the movement on the two-part photodetector, causing an offset in the track error signal TE. In order, nevertheless, to permit fine adjustment by means of the objective lens, the light beam (L) which scans the data is moved by a fine drive in a direction (W) which makes an angle alpha to the normal (R) to the data track. The light beam (L) is reflected from the disk onto a photodetector consisting of several photodiodes (A, B, C, D), and the track error signal TE is derived from the output signals (AS, BS, CS, DS) of said photodiodes by weighted sum and difference formation. Application: CD players, magneto-optical recording and reproducing devices, video disk players, DRAW disk players.
NO91912838A 1989-01-20 1991-07-19 OPTICAL SCANNING DEVICE. NO912838L (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19893901574 DE3901574A1 (en) 1989-01-20 1989-01-20 Optical scanning device
DE3942943A DE3942943A1 (en) 1989-12-23 1989-12-23 OPTICAL SCANNER
PCT/EP1990/000035 WO1990008381A1 (en) 1989-01-20 1990-01-09 Optical scanning device

Publications (2)

Publication Number Publication Date
NO912838D0 true NO912838D0 (en) 1991-07-19
NO912838L NO912838L (en) 1991-07-19

Family

ID=25876949

Family Applications (1)

Application Number Title Priority Date Filing Date
NO91912838A NO912838L (en) 1989-01-20 1991-07-19 OPTICAL SCANNING DEVICE.

Country Status (13)

Country Link
EP (1) EP0454740B1 (en)
JP (1) JP2807080B2 (en)
KR (1) KR0166358B1 (en)
CN (1) CN1053056C (en)
AT (1) ATE92664T1 (en)
DE (1) DE59002209D1 (en)
DK (1) DK0454740T3 (en)
ES (1) ES2044554T3 (en)
HK (1) HK8296A (en)
HU (1) HU208587B (en)
MY (1) MY105765A (en)
NO (1) NO912838L (en)
WO (1) WO1990008381A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3258363B2 (en) * 1992-03-26 2002-02-18 パイオニア株式会社 Tracking error detection device
DE4323067A1 (en) * 1993-07-10 1995-01-12 Thomson Brandt Gmbh G factor adjustment
JP3549301B2 (en) * 1995-09-08 2004-08-04 三菱電機株式会社 Optical head tracking error detector
DE10026830A1 (en) * 2000-05-30 2001-12-06 Zeiss Carl Jena Gmbh Optical sensor for measuring the distance and / or the inclination of a surface

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58100244A (en) * 1981-12-10 1983-06-14 Foster Denki Kk Optical information reproducing device
JPS58146034A (en) * 1982-02-24 1983-08-31 Nec Corp Optical system information recording and reading device
JPS62205533A (en) * 1986-03-06 1987-09-10 Seiko Instr & Electronics Ltd Optical information detecting device

Also Published As

Publication number Publication date
ATE92664T1 (en) 1993-08-15
KR910700520A (en) 1991-03-15
MY105765A (en) 1995-01-30
ES2044554T3 (en) 1994-01-01
CN1044358A (en) 1990-08-01
DK0454740T3 (en) 1993-11-22
KR0166358B1 (en) 1999-03-20
WO1990008381A1 (en) 1990-07-26
HU208587B (en) 1993-11-29
HU901683D0 (en) 1991-11-28
HK8296A (en) 1996-01-26
JP2807080B2 (en) 1998-09-30
HUT58943A (en) 1992-03-30
EP0454740A1 (en) 1991-11-06
CN1053056C (en) 2000-05-31
NO912838L (en) 1991-07-19
DE59002209D1 (en) 1993-09-09
JPH04502978A (en) 1992-05-28
EP0454740B1 (en) 1993-08-04

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