Patent ID: 6052337
Filing Date: 2000-04-18
Classification: G04C

Abstract:
An electronic watch comprising:an oscillator circuit;a divider circuit that divides an output signal from said oscillator circuit;a pulse synthesizing circuit that synthesizes a drive pulse, a correction pulse, a rotation detection pulse or the like to selectively output it;an oscillation system constant voltage circuit that applies a constant voltage to said oscillator circuit and a logic section of said oscillator circuit or to said oscillator circuit, said divider circuit and a logic section of said oscillator circuit;a stepping motor having a stator, a rotor and a coil;a drive circuit that drives said stepping motor by inputting an output signal from said pulse synthesizing circuit;a variable resistant element that generates an arbitrary voltage by resistance-dividing at least one end of said coil in accordance with an output of said drive circuit connected to the coil of said stepping motor; anda rotation detecting circuit that inputs a voltage of said oscillation system constant voltage circuit as a reference voltage, compares a detection voltage produced by said variable resistant element to discriminate the rotation or the non-rotation of the rotor of said stepping motor in accordance with the amplitude of said detection voltage value.