Patent ID: 6041021
Filing Date: 2000-03-21
Classification: G04C,H02P

Abstract:
An electronically controlled mechanical timepiece comprising:a mechanical energy source;a wheel train bridge;a generator driven by said mechanical energy source and connected to said mechanical energy source by said wheel train bridge, said generator generating induced electric power for supplying electric energy;a brake circuit that brakes said generator in response to a braking control signal;pointers connected to said wheel train bridge;and a rotation control circuit that controls said brake circuit to control the rotation cycle of said generator;wherein said rotation control circuit comprises:a rotation detection circuit that generates a rotation signal of said generator;a target-signal generating circuit that generates a target signal corresponding to a target number of revolutions;a phase-difference compensating circuit that detects a phase difference between said rotation signal output from said rotation detection circuit, and said target signal output from said target-signal generating circuit, and outputs a phase-difference compensation signal that is input to said brake circuit as said braking control signal.