Optical disc drive apparatus and method
AssigneeHewlett-Packard Development Company, L.P.
InventorsAndrew Van Brocklin, David Pettigrew
Life of this patent
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Abstract
An optical pickup unit (OPU) includes a moveable structure that is moved by a voice coil motor component in response to an input signal. The moveable structure includes a pattern that is moved corresponding to the input signal. An encoder reads the pattern to generate an output signal that corresponds to pattern movement as the input signal is applied over a period of time. A controller calculates a calibration factor relating the pattern movement to the input signal.
Claims30
An optical pickup unit (OPU) assembly comprising:
- a moveable structure;
- a moveable voice coil motor (VCM) component that produces a movement of the moveable structure in response to an input signal;
- an encoder configured to read a pattern on the moveable structure and generate an output signal corresponding to the movement of the pattern as the input signal is applied for a period of time;
- and
- a controller that receives the output signal and calculates a calibration factor relating the movement to the input signal.
A method comprising:
- applying an input signal to a voice coil motor (VCM) component that includes a pattern, wherein the VCM component is caused to move in a particular direction;
- measuring movement of the pattern in response to the applied input signal, and
- determining a change in the input signal corresponding to a particular amount of pattern distance movement.
A processor-readable medium comprising processor-executable instructions for measuring actual movement of a lens in an optical pickup unit assembly, the processor-executable instructions comprising instructions for:
- applying an input signal to a moveable voice coil motor (VCM) component that moves the lens in a particular direction;
- measuring movement of a pattern on the VCM component in response to the applied input signal;
- determining a distance of pattern movement corresponding to a change in the input signal;
- and
- calculating a calibration factor based on the distance of pattern movement and the change in the input signal.
An optical disc drive (ODD) comprising:
- means for applying an input signal to a VCM component that moves a lens in a direction relative to an optical disc;
- means for measuring a movement of a pattern on the VCM component responsive to the input signal;
- means for determining the amount of pattern movement resulting from a change in the input signal;
- and
- means for calculating a calibration factor based on the amount of pattern movement resulting from the change in the input signal.
Dependencies are inferred from the claim text.