Triple push-pull optical tracking system
First Claim
1. A triple push pull optical tracking method comprising:
- receiving a set of three reflectance values from three optical spots on a recording medium in an optical pickup system;
generating three S-curves by pair-wise subtraction of reflectance values;
generating a linear position estimate by processing the S-curves; and
servoing the optical pickup system to the recording medium.
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Accused Products
Abstract
A method of generating a composite signal in a closed loop servo signal system of a data recording system used to drive a recording head to any given position within a dynamic range of a servo tracks includes an optical pickup system for generating optical spots focused on a recording medium, the spots separated by equal distances across a track, the optical pickup system receiving a set of reflectances from the spots, a media system for providing the servo tracks responsive to optical spot illumination, an electric system for generating a set of filtered signals from the reflectances and for generating a set of S-curves by pair wise subtraction of the filtered signals, a processing system to generate a composite servo position signal from the S-curves and filtered reflectances, and a servo system for driving the recording head to a desired position by comparing the desired position to a measured position from the composite servo position.
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Citations
30 Claims
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1. A triple push pull optical tracking method comprising:
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receiving a set of three reflectance values from three optical spots on a recording medium in an optical pickup system;
generating three S-curves by pair-wise subtraction of reflectance values;
generating a linear position estimate by processing the S-curves; and
servoing the optical pickup system to the recording medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A triple push-pull system for generating a composite signal in a closed loop servo signal of a data recording system comprising:
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optical pickup system for generating three optical spots focused on a recording medium, the spots separated by equal distances across a track, the optical pickup system receiving a set of reflectances from the three spots;
media means for providing the servo tracks responsive to optical spot illumination;
electronic means for generating a set of three filtered signals from the three reflectances and generating a set of three S-curves by pair-wise subtraction of the filtered signals;
processing means to generate a composite servo position signal from the S-curves and filtered reflectances; and
servo means for driving the optical pickup system to a desired position by comparing the desired position to a measured position from the composite servo position. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of generating a composite signal in a closed loop servo signal of a data recording system comprising:
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generating in an optical pickup system three optical spots focused on a recording medium, the spots separated by equal distances across a track;
receiving a set of reflectances from the three spots;
generating a set of three filtered signals from the three reflectances;
generating a set of three S-curves by pairwise subtraction of the filtered signals;
generating a composite servo position signal from the S-curves and filtered reflectances; and
driving the optical pickup system to a desired position by comparing the desired position to a measured position from the composite servo position. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification