抄録
We have developed a practical mechanical watch offering the same level of accuracy as quartz watches. Our effort to develop this watch centered at two major points. The first point is to achieve compatibility between the electromagnetic brake used to control hand speed and the power generated for the control circuit, while the second is to detect rotor rotation speed during the brake is applied. We developed a rectifier circuit composed of a voltage doubler and a chopping pulse generator to boost the generated voltage. The chopping pulse also enables the system to generate electric energy and to detect rotation of the rotor during the brake is applied to the rotor. Because the electric circuit requires minute electric energy, the size of the generator and the mainspring used to supply mechanical energy can be reduced.
