Alps Electric Co., Ltd.

Takashi Watanabe

Takamichi Fuke

Yuichi Hishi

Chiaki Aikawa

A disk recording-reproducing device having a carriage with a read/write head, a screw shaft to shift the carriage with an engaging element through coupling between a spiral groove of the screw shaft and the engaging element, and a stepping motor to rotate the screw shaft. The spiral groove is composed of a number of groove portions each with a straight bottom whose angle of lead is substantially zero degree that are displaced successively, circumferentially and axially. Preferably, the screw shaft has plane portions for its positioning, and a rotor of the stepping motor has magnetization points being set correspondingly to the lines of the groove portions.

Growing community of inventors

Furukawa, Japan

Takashi Watanabe