MX9708407A - Dispositivo de registro o reproduccion y un metodo para reconocimiento de un estado de enfoque. - Google Patents
Dispositivo de registro o reproduccion y un metodo para reconocimiento de un estado de enfoque.Info
- Publication number
- MX9708407A MX9708407A MX9708407A MX9708407A MX9708407A MX 9708407 A MX9708407 A MX 9708407A MX 9708407 A MX9708407 A MX 9708407A MX 9708407 A MX9708407 A MX 9708407A MX 9708407 A MX9708407 A MX 9708407A
- Authority
- MX
- Mexico
- Prior art keywords
- recording
- reproducing device
- focusing state
- present
- state recognition
- 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
- G11B7/12—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
- G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
-
- 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
- G11B7/12—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)
Abstract
La presente invencion se relaciona a un dispositivo de registro de reproduccion, y a un método para reconocer un estado de enfoque. El objeto de la invencion es proporcionar un método de este tipo y un dispositivo de registro o de reproduccion, con la facilidad de producir astigmatismo significativo en el haz de luz reflejado (15) simplemente a un costo eficiente sin alineacion elaborada. Este objeto se logra por el uso de un elemento birrefringente (23, 24). La invencion es en particular, adecuada para utilizar en un dispositivo de registro o de reproduccion para escribir hacia o reproducir un medio de registro optico (11) tal como CD, vídeo discos, DVD y similares,
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19645110.8 | 1996-11-01 | ||
| DE19645110A DE19645110A1 (de) | 1996-11-01 | 1996-11-01 | Aufzeichnungs- oder Wiedergabegerät und Verfahren zum Erkennen eines Fokussierungszustands |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| MX9708407A true MX9708407A (es) | 1998-05-31 |
| MXPA97008407A MXPA97008407A (es) | 1998-10-23 |
Family
ID=
Also Published As
| Publication number | Publication date |
|---|---|
| EP0840302A2 (en) | 1998-05-06 |
| EP0840302A3 (de) | 1998-09-16 |
| EP0840302B1 (en) | 2002-04-10 |
| DE69711808T2 (de) | 2002-08-29 |
| US6249493B1 (en) | 2001-06-19 |
| JPH10261231A (ja) | 1998-09-29 |
| CN1181583A (zh) | 1998-05-13 |
| DE19645110A1 (de) | 1998-05-07 |
| DE69711808D1 (de) | 2002-05-16 |
| CN1127061C (zh) | 2003-11-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG | Grant or registration | ||
| MM | Annulment or lapse due to non-payment of fees |