HK8296A - Optical scanning device - Google Patents

Optical scanning device

Info

Publication number
HK8296A
HK8296A HK8296A HK8296A HK8296A HK 8296 A HK8296 A HK 8296A HK 8296 A HK8296 A HK 8296A HK 8296 A HK8296 A HK 8296A HK 8296 A HK8296 A HK 8296A
Authority
HK
Hong Kong
Prior art keywords
disk
data
objective lens
scanning device
light beam
Prior art date
Application number
HK8296A
Other languages
English (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/de
Priority claimed from DE3942943A external-priority patent/DE3942943A1/de
Application filed by Thomson Brandt Gmbh filed Critical Thomson Brandt Gmbh
Publication of HK8296A publication Critical patent/HK8296A/xx

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
    • 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
    • G11B7/0901—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)
HK8296A 1989-01-20 1996-01-18 Optical scanning device HK8296A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893901574 DE3901574A1 (de) 1989-01-20 1989-01-20 Optische abtastvorrichtung
DE3942943A DE3942943A1 (de) 1989-12-23 1989-12-23 Optische abtastvorrichtung

Publications (1)

Publication Number Publication Date
HK8296A true HK8296A (en) 1996-01-26

Family

ID=25876949

Family Applications (1)

Application Number Title Priority Date Filing Date
HK8296A HK8296A (en) 1989-01-20 1996-01-18 Optical scanning device

Country Status (13)

Country Link
EP (1) EP0454740B1 (xx)
JP (1) JP2807080B2 (xx)
KR (1) KR0166358B1 (xx)
CN (1) CN1053056C (xx)
AT (1) ATE92664T1 (xx)
DE (1) DE59002209D1 (xx)
DK (1) DK0454740T3 (xx)
ES (1) ES2044554T3 (xx)
HK (1) HK8296A (xx)
HU (1) HU208587B (xx)
MY (1) MY105765A (xx)
NO (1) NO912838D0 (xx)
WO (1) WO1990008381A1 (xx)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3258363B2 (ja) * 1992-03-26 2002-02-18 パイオニア株式会社 トラッキングエラー検出装置
DE4323067A1 (de) * 1993-07-10 1995-01-12 Thomson Brandt Gmbh G-Faktor-Abgleich
JP3549301B2 (ja) * 1995-09-08 2004-08-04 三菱電機株式会社 光ヘッドのトラッキング誤差検出装置
DE10026830A1 (de) * 2000-05-30 2001-12-06 Zeiss Carl Jena Gmbh Optischer Sensor zur Messung des Abstands und/oder der Neigung einer Fläche

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58100244A (ja) * 1981-12-10 1983-06-14 Foster Denki Kk 光学式情報再生装置
JPS58146034A (ja) * 1982-02-24 1983-08-31 Nec Corp 光学式情報記録読み取り装置
JPS62205533A (ja) * 1986-03-06 1987-09-10 Seiko Instr & Electronics Ltd 光情報検出装置

Also Published As

Publication number Publication date
DE59002209D1 (de) 1993-09-09
WO1990008381A1 (de) 1990-07-26
KR0166358B1 (ko) 1999-03-20
JP2807080B2 (ja) 1998-09-30
NO912838L (no) 1991-07-19
HU208587B (en) 1993-11-29
KR910700520A (ko) 1991-03-15
MY105765A (en) 1995-01-30
EP0454740A1 (de) 1991-11-06
CN1044358A (zh) 1990-08-01
HUT58943A (en) 1992-03-30
ES2044554T3 (es) 1994-01-01
JPH04502978A (ja) 1992-05-28
CN1053056C (zh) 2000-05-31
HU901683D0 (en) 1991-11-28
NO912838D0 (no) 1991-07-19
DK0454740T3 (da) 1993-11-22
ATE92664T1 (de) 1993-08-15
EP0454740B1 (de) 1993-08-04

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Legal Events

Date Code Title Description
PF Patent in force
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)

Effective date: 20090109