MY105765A - Optical pick-up - Google Patents

Optical pick-up

Info

Publication number
MY105765A
MY105765A MYPI90000095A MYPI19900095A MY105765A MY 105765 A MY105765 A MY 105765A MY PI90000095 A MYPI90000095 A MY PI90000095A MY PI19900095 A MYPI19900095 A MY PI19900095A MY 105765 A MY105765 A MY 105765A
Authority
MY
Malaysia
Prior art keywords
disk
data
light
players
tracking
Prior art date
Application number
MYPI90000095A
Inventor
Yasuaki Morimoto
Heinz-Jorg Schroder
Christian Buchler
Friedhelm Zucker
Gerhard Weibmann
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 MY105765A publication Critical patent/MY105765A/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
    • 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)

Abstract

IN RECORDING AND/OR PLAYBACK EQUIPMENT THAT READS DATA FROM AN OPTICAL RECORDED MEDIUM, A DISK FOR EXAMPLE, BY THE SINGLE-BEAM METHOD, THE WHOLE OPTICAL PICK-UP IS SHIFTED IN ORDER TO POSITION THE BEAM OF LIGHT ALONG THE DISK''S DATA-STORAGE TRACKS. FINE ADJUSTMENT BY SIMPLY MOVING THE PARALLEL RADIALLY AS IN THE THREE-BEAM METHOD IS IMPOSSIBLE BECAUSE THE SPOT OF LIGHT ON TWO-PART PHOTODETECTOR IMITATES THE MOTION, CAUSING AN OFFSET IN THE TRACKING-ERROR SIGNAL TE. TO ALLOW FINE ADJUSTMENT WITH THE OBJECTIVE LENS, THE BEAM (L) OF LIGHT THAT SCANS THE DATA IS MOVED BY A FINE-ADJUSTMENT MECHANISM ALONG A DIRECTION (W) AT AN ANGLE (ALPHA) TO THE NORMAL ( ) TO THE DATA-STORAGE TRACK. THE DISK REFLECTS THE BEAM ONTO A PHOTODETECTOR COMPRISING SEVERAL PHOTODIODES (A, B, C & D). THE TRACKING-ERROR SIGNAL TE IS OBTAINED FROM THE SIGNALS (AS, BS, CS & DS) EMITTED BY THE DIODES BY WEIGHTED CONSTRUCTION OF SUMS AND DIFFERENCES. COMPACT-DISK PLAYERS, MAGNETO-OPTICAL RECORDING AND PLAYBACK EQUIPMENT, VIDEODISC PLAYERS, AND DRAW-DISK PLAYERS.(FIG. 7)
MYPI90000095A 1989-01-20 1990-01-19 Optical pick-up MY105765A (en)

Applications Claiming Priority (2)

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

Publications (1)

Publication Number Publication Date
MY105765A true MY105765A (en) 1995-01-30

Family

ID=25876949

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI90000095A MY105765A (en) 1989-01-20 1990-01-19 Optical pick-up

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) NO912838D0 (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
DE59002209D1 (en) 1993-09-09
WO1990008381A1 (en) 1990-07-26
KR0166358B1 (en) 1999-03-20
JP2807080B2 (en) 1998-09-30
NO912838L (en) 1991-07-19
HU208587B (en) 1993-11-29
KR910700520A (en) 1991-03-15
EP0454740A1 (en) 1991-11-06
CN1044358A (en) 1990-08-01
HUT58943A (en) 1992-03-30
HK8296A (en) 1996-01-26
ES2044554T3 (en) 1994-01-01
JPH04502978A (en) 1992-05-28
CN1053056C (en) 2000-05-31
HU901683D0 (en) 1991-11-28
NO912838D0 (en) 1991-07-19
DK0454740T3 (en) 1993-11-22
ATE92664T1 (en) 1993-08-15
EP0454740B1 (en) 1993-08-04

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