NO912838L - OPTICAL SCANNING DEVICE. - Google Patents
OPTICAL SCANNING DEVICE.Info
- Publication number
- NO912838L NO912838L NO91912838A NO912838A NO912838L NO 912838 L NO912838 L NO 912838L NO 91912838 A NO91912838 A NO 91912838A NO 912838 A NO912838 A NO 912838A NO 912838 L NO912838 L NO 912838L
- Authority
- NO
- Norway
- Prior art keywords
- disk
- data
- objective lens
- scanning device
- light beam
- 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)
- 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)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Geophysics And Detection Of Objects (AREA)
- Analysing Materials By The Use Of Radiation (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.
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 NO912838D0 (en) | 1991-07-19 |
NO912838L true 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)
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 |
---|---|---|---|---|
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 |
-
1990
- 1990-01-09 DE DE9090902187T patent/DE59002209D1/en not_active Expired - Lifetime
- 1990-01-09 EP EP90902187A patent/EP0454740B1/en not_active Expired - Lifetime
- 1990-01-09 HU HU901683A patent/HU208587B/en not_active IP Right Cessation
- 1990-01-09 DK DK90902187.5T patent/DK0454740T3/en active
- 1990-01-09 AT AT90902187T patent/ATE92664T1/en not_active IP Right Cessation
- 1990-01-09 KR KR1019900702087A patent/KR0166358B1/en not_active IP Right Cessation
- 1990-01-09 WO PCT/EP1990/000035 patent/WO1990008381A1/en active IP Right Grant
- 1990-01-09 JP JP2502323A patent/JP2807080B2/en not_active Expired - Fee Related
- 1990-01-09 ES ES90902187T patent/ES2044554T3/en not_active Expired - Lifetime
- 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 NO91912838A patent/NO912838L/en unknown
-
1996
- 1996-01-18 HK HK8296A patent/HK8296A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
HU901683D0 (en) | 1991-11-28 |
HK8296A (en) | 1996-01-26 |
KR910700520A (en) | 1991-03-15 |
JPH04502978A (en) | 1992-05-28 |
NO912838D0 (en) | 1991-07-19 |
EP0454740B1 (en) | 1993-08-04 |
EP0454740A1 (en) | 1991-11-06 |
CN1053056C (en) | 2000-05-31 |
DK0454740T3 (en) | 1993-11-22 |
HU208587B (en) | 1993-11-29 |
CN1044358A (en) | 1990-08-01 |
WO1990008381A1 (en) | 1990-07-26 |
JP2807080B2 (en) | 1998-09-30 |
MY105765A (en) | 1995-01-30 |
KR0166358B1 (en) | 1999-03-20 |
HUT58943A (en) | 1992-03-30 |
ES2044554T3 (en) | 1994-01-01 |
ATE92664T1 (en) | 1993-08-15 |
DE59002209D1 (en) | 1993-09-09 |
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