Abstract: An optical disc drive 1 includes a spindle motor 11 for rotating the optical disc 2 and a spindle driver for driving the spindle motor 11 equipped with a rotation number counter 232 for measuring the rotation number of the spindle motor 11. A brake for braking the spindle motor 11 to reduce the rotation number thereof, can include at least three types of brake modes, and a selector for selecting one of the types of brake modes in response to the rotation number measured by the rotation number counter 232 when the rotation number of the spindle motor 11 is to be reduced. The optical disc drive 1 may further include a judging circuit for judging whether the rotation number of spindle motor 11 measured by the rotation number counter 232 reaches a predetermined target rotation number when the rotation of the optical disc 2 is to be stopped by the spindle motor 11.

Abstract: An optical disc drive 1 of the present invention includes a spindle motor 11 for rotating the optical disc 2, a spindle driver for driving the spindle motor 11 equipped with rotation number measuring means 232 for measuring the rotation number of the spindle motor 11, brake means for braking the spindle motor 11 to reduce the rotation number thereof, which includes at least three types of brake modes, and selecting means for selecting one of the at least three types of brake modes in response to the rotation number measured by the rotation number measuring means 232 when the rotation number of the spindle motor 11 is to be reduced. The optical disc drive 1 may further includes judging means for judging whether the rotation number of spindle motor 11 measured by the rotation number measuring means 232 reaches a predetermined target rotation number when the rotation of the optical disc 2 is to be stopped by the spindle motor 11.

Abstract: A pickup driving system for an optical disk apparatus is disclosed for moving a pickup unit across tracks of a rotating optical disk to read data at a target track position on the optical disk while avoiding drive motor instability, and errors caused by position overruns and underruns. A pulse voltage is superposed on the driving voltage of the drive motor for driving the pickup unit at predetermined intervals (defined by the pulse train) toward the target track position.