Patent ID: 6952382

Claim:
A recording and reproduction apparatus for a recording medium including a plurality of information layers, the recording and reproduction apparatus comprising: a focusing signal generation section for generating a focusing signal F+ and a focusing signal F− in accordance with a light beam reflected by the recording medium; a focusing control section for generating a focusing error signal in accordance with a difference between the focusing signal F+ and the focusing signal F−, and performing focusing control for maintaining a distance between a focal point of the light beam directed to the recording medium and a target information layer among the plurality of information layers within a prescribed tolerable range in accordance with the focusing error signal; and a gain setting section for setting a focusing servo gain in accordance with the focusing error signal, wherein the focusing signal generation section generates the focusing signal F+ and the focusing signal F− so that a component of the focusing signal F+ and a component of the focusing signal F− which are based on the light beam reflected by an information layer other than the target information layer have substantially an equal value to each other while the focusing control section is performing the focusing control.