Patent ID: 8036095
Filing Date: 2011-10-11
Classification: G11B

Abstract:
1. A signal processing device for optical disks comprising: a reflected light process section configured to convert reflected light received by an optical pickup into an electric signal based on a first gain, wherein the optical pickup emits laser light to an optical disk and receives reflected light from the optical disk; a servo signal generation section configured to generate a servo signal by using the electric signal generated by the reflected light process section; a servo signal control section configured to control the servo signal so that a change in the amplitude of the servo signal, in response to an increase or decrease of the amount of the reflected light from the optical disk, is suppressed using an attenuator that attenuates the servo signal generated by the servo signal generation section by a factor of a second gain; and, a gain setting section configured to set the first gain to the reflected light process section and the second gain to the servo signal control section substantially simultaneously.