Rhythm Watch Co., Ltd.

Citizen Watch Company, Ltd.

Minosaku Aso

Akira Nikaido

Katsuhiko Takebe

Masao Fukuda

Setsuyuki Karasawa

Yoshinori Goto

Minoru Shiratori

A synchronous motor for a timepiece capable of cancelling unbalance in self-starting driving power with regard to the oscillating direction at the time of self-starting, in which adjoining stator pole pitch angles are set at 0.5 times or 1.5 times the rotor pole pitch angle. Provision of specific directional performance is restricted to direction of self-starting rotation. The air gap between the stator supplementary poles and the rotor is set at a ratio between 1 and 1.4 against the air gap between the stator main poles and the rotor; width of the stator supplementary poles is wider than the stator main poles.

Synchronous motor for timepiece

A time striking device for an electronic timepiece including a time striking signal detecting means coordinately arranged and installed in a time indicating gear train of an electronic timepiece and supplying a time striking signal prior to a striking time at every striking time, a reference zero second detecting means counting timepiece driving pulses and supplying a reference zero second signal, a coincidence circuit supplying a primary time striking direction signal by the coincidence of the outputs from these two detecting means, a frequency dividing circuit counting the timepiece driving pulses and sending out the secondary time striking direction signal at a desired time interval, a selecting circuit selectively supplying the primary time striking direction from the coincidence circuit and the secondary time striking direction signal from the frequency dividing circuit to a time striking section.

Time striking device for electronic timepiece

Growing community of inventors

Showa, Japan

Minosaku Aso