A thin ultrasonic motor which was originally developed for a calendar drive unit was further utilized for watch hands drive unit. Driving watch hands requires lower power consumption and shorter driving time compared to driving a calendar. The trajectory of the stator tip was modified by changing the phase difference between the two vibration modes, and contact angle of the stator with respect to the rotor was optimized to achieve lower power consumption and shorter driving time.

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We developed the performance prediction analysis techniques that aimed to improve the performance of mechanical watches. In this analysis, each part of watch mechanisms was modeled based on the motion equation of balance with hairspring. It is possible to forecast the Amplitude and the Daily rate by adding torque to the model. The output of the analysis provides enough evidence of usefulness by comparing with the actual measured data.

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The collisions of elastic bar and elastic beam are treated analytically. It is already known that the collision phenomena of bar and beam will constitute form from only one time collision pattern to two or more intermittent type of collision patterns. However, these patterns are determined by the following three principal parameters when an elastic bar collides with a both-ends supported elastic beam. Thus, they are 1) mass ratio, 2) natural-frequency ratio in the first-order mode, and 3) collision position ratio. In this paper, we studied analytically how a variation of the boundary condition of a beam (both-ends are supported beam, both-ends are clamped beam, one end clamped the other end free beam) would influence collision phenomena. The bar and beam to be used were unified and the variation was investigated by changing only a boundary condition.

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The tool is expected to monitor the living body information without feeling strange in daily life. Although the pulse rate is the important information of the living body, it was difficult to measure pulse rate correctly during motion, because the pulse rate have much influenced of the body motion. We developed pulse rate measurement technology to reduce influence of motion by sensor and signal processing.

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