Blu-ray optical pick-up devices and methods
AssigneeMarvell World Trade Ltd.
InventorsJeroen Dorgelo, Mats Oberg, Antonius Leonardus Johannes Dekker
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Abstract
New and useful methods and systems for reading optical discs, such as multi-layer Blu-ray discs are disclosed. For example, in an embodiment a device for reading two-layered optical discs includes a laser diode capable of emitting light, a set of optics including a fixed collimator, the set of optics providing a numerical aperture (NA) of substantially less than 0.85, and a detector for detecting laser light focused on a two-layer optical disc to produce a stream of detected bits.
Claims22
A device for reading multi-layered optical discs, comprising:
- a laser diode capable of emitting light;
- a set of optics including a fixed collimator, the set of optics providing a numerical aperture (NA) of less than 0.85 and an optical path length having a distance from a surface of the optical disc to a focal point within the optical disc that is 75 um to 100 um;
- and
- a detector for detecting laser light focused on a multi-layer optical disc to produce a stream of detected bits.
A method for reading multi-layered optical discs, comprising:
- emitting laser light through a set of optics including a fixed collimator, the set of optics providing a numerical aperture (NA) of substantially less than 0.85 and an optical path length having a distance from a surface of the optical disc to a focal point within the optical disc that is 75 um to 100 um;
- and
- detecting laser light focused on a multi-layer optical disc to produce a stream of detected bits.
Dependencies are inferred from the claim text.