Importance

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Abstract

A rotation number of a motor adapted to rotate a record medium having a disc shape with respect to a pickup is controlled. The controlling method is provided with steps of: calculating switching positions on the record medium, at each of which a changing rate of an actual rotation number of the motor in a radial direction of the record medium is to be changed such that an error of the actual rotation number with respect to an ideal rotation number for rotating the record medium by a constant linear velocity is within a predetermined range, the actual rotation number at each of the switching positions and the changing rate between each two of the switching positions adjacent to each other; detecting a radial position of the pickup with respect to the record medium when the pickup is performing one of the recording and reproducing operations; and controlling the motor to change the actual rotation number to be equal to the calculated rotation number when the pickup is positioned at said each switching position and to change the actual rotation number by the calculated changing rate between said each two of the switching positions adjacent to each other on the basis of the detected radial position.

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First Claim