Focus offset calibration
AssigneeHewlett-Packard Development Company, L.P.
InventorsAndrew L Van Brocklin, Darwin M. Hanks, Greg J. Lipinski
Life of this patent
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Abstract
A series of signals is applied to a lens actuator of a disc media marking device to respectively position a lens at a series of distances from an optical disc. A mark is formed on the optical disc at each of the distances of the lens from the optical disc by passing a light beam through the lens and onto the optical disc. The darkest of the marks is determined. The signal applied to the actuator corresponding to the darkest mark is determined.
Claims38
A method of operating a disc media marking device, comprising:
- applying a series of signals to a lens actuator of the disc media marking device to respectively position a lens at a series of distances from an optical disc;
- forming a mark on the optical disc at each of the distances of the lens from the optical disc by passing a light beam through the lens and onto the optical disc;
- determining which of the marks is the darkest;
- and
- identifying the signal applied to the actuator corresponding to the darkest mark.
A method of calibrating a focus offset for a disc media marking device, comprising applying a first signal to a lens actuator of the disc media marking device to move a lens to a focus location;
- applying a series of second signals to the lens actuator to respectively position the lens at a series of offset distances from the focus location;
- forming a mark on an optical disc at each of the offset distances by passing a light beam through the lens and onto the optical disc;
- determining which of the marks is the darkest;
- and
- identifying the second signal applied to the actuator corresponding to the darkest mark.
An optical disc drive comprising:
- a means for applying a series of signals to a lens actuator of the optical disc drive to respectively position a lens at a series of distances from an optical disc;
- a means for forming a mark on the optical disc at each of the distances of the lens from the optical disc by passing a light beam through the lens and onto the optical disc;
- a means for determining which of the marks is the darkest;
- and
- a means for identifying the signal applied to the actuator corresponding to the darkest mark.
An optical disc drive comprising:
- a lens actuator;
- a lens connected to the lens actuator;
- a light source;
- and
- a controller electrically coupled to the lens actuator, the controller adapted to cause the optical disc drive to perform a method comprising:
- applying a series of signals to the lens actuator to respectively position the lens at a series of distances from an optical disc;
- forming a mark on the optical disc at each of the distances of the lens from the optical disc by directing a light beam from the light source through the lens and onto the optical disc;
- determining which of the marks is the darkest;
- and
- identifying the signal applied to the actuator corresponding to the darkest mark.
A computer-usable medium containing computer-readable instructions for causing an optical disc drive to perform a method comprising:
- applying a series of signals to a lens actuator of the optical disc drive to respectively position a lens at a series of distances from an optical disc;
- forming a mark on the optical disc at each of the distances of the lens from the optical disc by passing a light beam through the lens and onto the optical disc;
- determining which of the marks is the darkest;
- and
- identifying the signal applied to the actuator corresponding to the darkest mark.
Dependencies are inferred from the claim text.