Patent ID: 7613092

Claim:
A reproduction apparatus that reproduces information recorded in a recording medium having plural recording layers, comprising: an optical head means for irradiating laser beams on the respective recording layers with an object lens as an output end and detecting reflected light information of the laser beams to read out information recorded in the respective recording layers; a shaft sliding type focus actuator means for holding the object lens, said actuator means movable in a direction in which the object lens approaches and separates from the recording medium; a focus servo means for generating a focus servo drive signal on the basis of a focus error signal, which is obtained from the reflected light information read out by the optical head means, and driving the focus actuator means such that a focus state of the laser beams is kept in a state of focus on a recording layer on which the reproduction is performed; and a focus jump control means for generating a kick signal for starting focus jump movement by the focus actuator means and a brake signal for ending the focus jump movement by the focus actuator means when the state of focus on a certain recording layer is shifted to a state of focus on another recording layer, wherein the focus jump control means calculates the kick signal such that a magnitude of the kick signal continuously rises from an initial value to a maximal value during a drive period.