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US 7,679,633 B2Granted
Facilitating focusing of a multi-function digital media drive
AssigneeHewlett-Packard Development Company, L.P.
InventorAndrew L. Van Brocklin
Life of this patent
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Abstract
A method of facilitating focusing of a multi-function digital media drive, is such as to generate two or more error signals each indicative of a focus of an energy beam by an optical arrangement onto first and second different recording layers of a digital medium in the drive, the first recording layers being covered with a protective, energy beam transparent substrate. A selected on of the error signal is used to determine a focus correction.
Claims1
A method of facilitating focusing of a multi-function digital media drive, comprising:
- generating two or more error signals each indicative of a focus of an energy beam by an optical arrangement onto different first and second recording layers of a digital medium in the drive, the first recording layer being covered with a protective, energy beam transparent substrate;
- and
- determining a focus correction based on a selected one of the error signals,
- wherein at least one of the two or more error signals corresponds to a data layer of the digital medium and at least another one of the two or more error signals corresponds to a labeling layer of the digital medium, and wherein the generating two or more error signals further comprises:
- generating the energy beam;
- projecting the energy beam against the medium;
- reflecting the energy beam which is reflected off the medium to an optical element;
- using the optical element, which has two or more regions that have optical characteristics selected in accordance with corrections to be implemented by the two or more error signals, to direct beam energy to two or more sensor arrangements respectively, and
- using the outputs of the two or more sensor arrangements to derive the two or more error signals.
6 more elements
Dependencies are inferred from the claim text.