Abstract: An information reproduction device sets, from among a plurality of estimated rotation speeds previously estimated, a set rotation speed in accordance with request-specification information specifying a piece of data requested by an external device and a specified rotation speed specified by the external device for a disc-shaped storage medium storing data, rotates the storage medium at the set rotation speed, reads out data from the storage medium at a readout speed that is determined by the set rotation speed of the storage medium, stores the data in a data storage section, and supplies, from among the stored data, the piece of data corresponding to the request-specification information to the external device.

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: In an optical disc apparatus reading and writing data with respect to an optical disc, a motor controller uses widest pattern signals outputted from an optical pickup for judging size of an optical disc mounted on a turn table and stop of rotation of the optical disc. Since an inverse number of the widest pattern signal has correlation with a frequency sensed by a conventional frequency generator, the motor controller calculates a difference between inverse numbers of the widest pattern signals before and after putting braking force to the turn table, and judges the size of the optical disc with reference to variation of rotation speed before and after the braking. The motor controller further calculates a prediction time when the rotation of the optical disc will be stopped with using the variation of the inverse number of the widest pattern signal, stops to put the braking force to the turn table at the prediction time, and judges the rotation of the optical disc has been stopped.

Abstract: A record player is provided with a turntable brake for instantly stopping the turntable of the record player in playback when desired and a pair of balance wheels for permitting slant of the turntable within a predetermined range when manually operating the turntable. The turntable hereof has a peripheral drum portion extending downwardly from its bottom and a rubber shoe is mounted on one end of a pivoted lever arm. The lever arm is adapted to be actuated to press the rubber shoe against the drum portion of the turntable for stopping rotating movement of the turntable by means of friction.