Patent ID: 8149665

Claim:
An optical disc device comprising: an optical illumination means for emitting light to form a light spot on an optical disc; a driving means for performing predetermined operations on an objective lens in relation to the optical disc, based on a driving control signal; an opto-electric conversion means for detecting reflected light information related to light reflected from the optical disc; a positional deviation signal detection means for detecting a relative positional error between the objective lens and the optical disc on the basis of the reflected light information and outputting a positional deviation signal; a control signal generating means for generating a control signal defining a control quantity in the predetermined operation, based on the positional deviation signal obtained from the positional deviation signal detection means; a positional control deviation evaluation means for receiving the positional deviation signal as an input, evaluating the positional deviation signal from the positional deviation signal detection means by judging whether the positional deviation signal is within a predefined range, and outputting a positional control deviation evaluation result indicating a state of the positional deviation signal amplitude; a corrective kick and brake signal set generating means for generating and outputting a corrective kick and brake signal set including a kick signal followed continuously by a brake signal for the driving means, based on an evaluation result of the positional control deviation evaluation means; an adding means for adding the corrective kick and brake signal set and the control signal, and outputting the result of the addition; and a switching means disposed between the corrective kick and brake signal set generating means and the adding means to switch the adding of the corrective kick and brake signal set to the control signal on when the positional deviation signal is outside of the predefined range, and off when the positional deviation signal is within the predefined range, wherein the corrective kick and brake signal set generating means starts output of the kick signal when the positional deviation signal becomes outside of the predefined range, and terminates the output of the kick signal and starts the output of the brake signal when the positional deviation signal becomes within the predefined range.