Patent ID: 8107330
Filing Date: 2012-01-31
Classification: G11B

Abstract:
1. An information recording and reproducing apparatus for recording and/or reproducing information by irradiating a disk with laser light, comprising: reference value data storing means for previously storing reference value data in accordance with a focus bias voltage when a predetermined radial position on a reference disk is focused; sample value data obtaining means for detecting a focus bias voltage when a predetermined radial position on a target disk with respect to which information is to be recorded/reproduced is focused, prior to a commencement of a recording/reproducing operation, and obtaining sample value data in accordance with the detected focus bias voltage under a condition that the sample value data is associated with the radial position; positional information obtaining means for obtaining positional information on a recording/reproducing position on the target disk; tilt servo signal generating means for generating a tilt servo signal at the recording/reproducing position on the target disk, based on a differential value between the reference value data stored in the reference value data storing means and the sample value data obtained by the sample value data obtaining means, and the positional information obtained by the positional information obtaining means; and tilt adjusting means for adjusting a tilt of laser light with respect to a disk surface in accordance with the tilt servo signal generated by the tilt servo signal generating means.