| 摘要 |
<P>PROBLEM TO BE SOLVED: To stabilize feed operation of an optical pickup under a broad operating temperature environment in a drive mechanism of the optical pickup using a stepping motor. <P>SOLUTION: A stepping motor controller 51 moves the optical pickup 3 to an inner periphery section in two phase excitation drive by two phase excitation drive control section 52 at start time of the device, and detects the current amplitude of a drive current which completes move of the optical pickup 3 in predetermined time. A micro step drive control section 53 increases a current supply period of the drive current by setting supply time multiplied by a coefficient according to the current amplitude as a current supply period at time of carrying out the micro step drive when the current amplitude at the time of two phase excitation drive is larger than a reference value. This drive current carries out micro step drive of the stepping motor 4 and the optical pickup 3 is moved in a radial direction of an optical disk 1, and an optical axis correction transfer operation which makes a lens shift amount of an objective lens 5 equal or less than the prescribed value is performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
