MY105765A - Optical pick-up - Google Patents
Optical pick-upInfo
- 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
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)
- Vehicle Body Suspensions (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Optical Head (AREA)
- Microscoopes, Condenser (AREA)
- Optical Communication System (AREA)
- Holo Graphy (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Analysing Materials By The Use Of Radiation (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)
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58100237A (en) * | 1981-12-10 | 1983-06-14 | Foster Denki Kk | Optical information reader |
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 |
-
1990
- 1990-01-09 KR KR1019900702087A patent/KR0166358B1/en not_active IP Right Cessation
- 1990-01-09 EP EP90902187A patent/EP0454740B1/en not_active Expired - Lifetime
- 1990-01-09 ES ES90902187T patent/ES2044554T3/en not_active Expired - Lifetime
- 1990-01-09 JP JP2502323A patent/JP2807080B2/en not_active Expired - Fee Related
- 1990-01-09 WO PCT/EP1990/000035 patent/WO1990008381A1/en active IP Right Grant
- 1990-01-09 DE DE9090902187T patent/DE59002209D1/en not_active Expired - Lifetime
- 1990-01-09 AT AT90902187T patent/ATE92664T1/en not_active IP Right Cessation
- 1990-01-09 DK DK90902187.5T patent/DK0454740T3/en active
- 1990-01-09 HU HU901683A patent/HU208587B/en not_active IP Right Cessation
- 1990-01-19 MY MYPI90000095A patent/MY105765A/en unknown
- 1990-01-20 CN CN90100284A patent/CN1053056C/en not_active Expired - Fee Related
-
1991
- 1991-07-19 NO NO912838A patent/NO912838D0/en unknown
-
1996
- 1996-01-18 HK HK8296A patent/HK8296A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
CN1053056C (en) | 2000-05-31 |
JPH04502978A (en) | 1992-05-28 |
DK0454740T3 (en) | 1993-11-22 |
CN1044358A (en) | 1990-08-01 |
JP2807080B2 (en) | 1998-09-30 |
ATE92664T1 (en) | 1993-08-15 |
DE59002209D1 (en) | 1993-09-09 |
EP0454740B1 (en) | 1993-08-04 |
HU901683D0 (en) | 1991-11-28 |
HU208587B (en) | 1993-11-29 |
WO1990008381A1 (en) | 1990-07-26 |
EP0454740A1 (en) | 1991-11-06 |
NO912838L (en) | 1991-07-19 |
KR910700520A (en) | 1991-03-15 |
NO912838D0 (en) | 1991-07-19 |
ES2044554T3 (en) | 1994-01-01 |
HK8296A (en) | 1996-01-26 |
HUT58943A (en) | 1992-03-30 |
KR0166358B1 (en) | 1999-03-20 |
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