Hot forging process of titaniumalloy into the middle of watch case has been analyzed by the finite elementmethod, FEM. The results of the FEM analysis for which 2-dimensions modeling was used are qualitatively consistent with those of the hot forging process experiment to a product having 3-dimensions shape. Therefore, the FEM analysis can be simplified by converting the preform and product having 3-dimensions shape into 2-dimensions modeling with axis symmetry. The FEM analysis was found to be considerably effective for predicting forging conditions and preform sizes.

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Today, quartz watches which have an electric power generator as the energy source are paid great attention.SEIKO/KINETIC brand of quartz watchesalso have generators which generate power from the movement of the wearer'sarm.These automatic generating watches are being made smaller and thinner. As they become smaller and thinner, they also generate less electric power because of less input. In order to bring small, thin automatic generating watchesto market, we have to improve efficiency of their electric generator. The movement of oscillating weight, when the watch is worn, is a very important factor asregards this improvement. To appreciate this movement, we made an instrument which can record position of the weight while it is worm. As a result, movements of the oscillating weight are almost narrow angle with slow speed.

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The accelerometer was manufactured by newly developed techniques. Thesensor has cantilever type structure and a detection element that runs parallel to the direction of acceleration.The mainly manufacturing process useddicing saw for cutting the sensor chip.The sensor shows excellent performance such as linearity, frequency response. This paper suggests a new method and new structure for fabricating an accelerometer.

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A small displacement sensor in a coupled-cavity laser configuration formed with amoving extemal mirror ispresented to dynamically measure small forces. The sensor provides high sensitivity with a minimum detectable displacement of 0.8 nm independently of the lasing wavelength, while the lasingstate is mechanically stabilized by anegative feedback loop to maintain a constant external cavity length. We show that this sensor is of great use fordetecting extremely small distortion of a stiff cantilever, reflecting transient variations of small friction forces in mechanical systems.

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