Patent ID: 7177246
Filing Date: 2007-02-13
Classification: G11B

Abstract:
1. A system for providing a signal to an actuator within an optical disk drive, to focus optics on a disk within the optical disk drive, wherein the system comprises: a SUM table within which to record SUM signal data, the SUM signal data representing a summation of values from a plurality of focus sensors, and is different than a focus error signal (FES) representing a difference between a sum of the values from a first subset of the focus sensors and a sum of the values from a second subset of the focus sensors; an error term generator to process the SUM signal data from the SUM table to produce an error term; and an actuator control signal generator to generate an actuator control signal, wherein the actuator control signal is a function of a prior actuator position, the error term and an adaptation coefficient, wherein the adaptation coefficient is configured to regulate a rate at which the error term is allowed to modify the prior actuator position.