| 摘要 |
PROBLEM TO BE SOLVED: To suppress variation of a moving speed of a carriage, or the like, based on variation in excitation characteristics between two exciting coils of a two-phase stepping motor which is a driving source of the carriage. SOLUTION: The optical disk drive 1 is equipped with a carriage actuator 102 for driving the carriage 10 by driving forces of the carriage 10 and the two-phase stepping motor. An objective lens 104 for converging laser beams to the optical disk 2 and a lens actuator 105 for displacing this objective lens 104 are mounted on the carriage 10. By a system control section 5, e.g. in an one-phase excitation driving method, the two-phase stepping motor is driven by a first power supplying mode for supplying the power to only an A-phase exciting coil and by a second power supplying mode for supplying the power to only a B-phase exciting coil, and also the movement amount of the carriage 101 at that time is detected from the relative displacement amount of the objective lens 104 with respect to the carriage 101, and the power supplied to the A-phase exciting coil and B-phase exciting coil are adjusted so that the movement amount of the carriage 101 between the first and second power supplying modes becomes almost the same in accordance with the detection result. COPYRIGHT: (C)2007,JPO&INPIT |
