Kabushiki Kaisha Toshiba

Kabushiki Gaisha Sg

Youshichi Kikuchi

Wataru Shimizu

Jitsuo Toda

Teruhumi Akama

The rotation of a motor is converted into a swinging movement of an ultrasonic transducer by a conversion mechanism. The relationship between a rotation angle .theta. of the motor and a swinging angle .eta. of the ultrasonic transducer can be expressed by .eta.=tan.sup.-1 (sin.theta.). The rotation of the motor is detected by a rotation detector of a reluctance type having an eccentric rotor. A signal having a nonlinear relationship with respect to an actual rotation angle .theta. of the motor, which can be expressed by the following equation, is supplied to a motor driver from the rotation detector:

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Tochigi, Japan

Youshichi Kikuchi