Present status and trend of mechanoelectrical technology in information processing machinery.

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This review describes the present status, features and trend of mechanoelectrical technology in information processing machinery, which is called "mechatronics" in Japan. In information processing machinery, such as storage and output devices, the transformation between spatially allocated recording data and time series electrical data is performed by a mechanical motion of a body with mass. The performance of such devices depends on the speed and precision of the mechanical motion. The key mechanism to realize high-speed and precise motion is here generally called "positioning/tracking mechanism"; it is further subdivided into four key mechanisms: the "motion positioning mechanism", "constant speed mechanism", "positioning mechanism" and "tracking mechanism". Their present levels of performance and basic design method are described. Explanation of current important problems and leading research related to these four key mechanisms and mechanical motion is also given. In the evolution of mechatronics in data processing machinery, miniaturization is an essential trend. Since this miniaturization results in a decrease in the signal-to-noise ratio of the mechanical motion, the reduction of uncontrolled vibration modes, friction force and wear is becoming more and more important, as the mechatronics evolves into micromechatronics.

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