Patent ID: 7333412

Claim:
An optical disk recording/reproducing apparatus for performing a focus jump operation moving a beam spot among a plurality of recording layers of a multilayer optical disk having a plurality of recording layers corresponding to a record/reproduce operation for recording data on said multilayer optical disk or reproducing data recorded on said multilayer optical disk, comprising: an optical pick-up having an objective lens, a focus actuator for moving the objective lens in a focus direction, a beam emitting means for emitting a beam of light, a light receiving means for receiving light returned from said optical disk, and an optical system for guiding the beam of light from said beam emitting means to said objective lens and guiding the returned light from said optical disk incident upon said objective lens to said light receiving means; and a focus drive controlling means for outputting to said focus actuator a focus drive signal for moving said objective lens in the focus direction for positioning the beam spot from said objective lens to a target positioning recording layer of said multilayer optical disk when a focus jump start signal and a target positioning recording layer signal are applied and outputting a first deceleration pulse to said focus actuator by referring to a focus error signal and a summation signal obtained from returned light from said optical disk in accordance with the location of said objective lens moved in accordance with the drive of said focus actuator, wherein said focus drive controlling means outputs to said focus actuator as said focus drive signal a focus jump drive signal increasing by a certain gradient, and then outputs to said focus actuator said first deceleration pulse when said focus error signal exceeds a first threshold value, said summation signal exceeds a second threshold value, and said focus error signal crosses zero.