Citizen Watch Company, Ltd.

Ricoh Watch Co., Ltd.

Akira Kikuyama

Shigekazu Takahashi

Nobuo Toyama

Kazutoshi Ichinose

A high precision timepiece pace measuring device wherein a first mask circuit inhibits the entry of a first signal of the timepiece so as to initiate a measurement of the pace of the timepiece from a second signal of the timepiece, while a second mask circuit inhibits the entry of timepiece signals, external noises and the like during a period from a time at the initiation of the measurement to a time immediately before the termination thereof, wherein a counter circuit which receives the timepiece signals as its inputs is connected to a nine's complement presetting circuit, to a carry detecting circuit and to normal and nine's complement circuits which are respectively selected in accordance with the presence and absence of a carry in the counter circuit, and wherein output pulses of the counter circuit are fed back via a counter matrix circuit so as to set the mask period of the second mask circuit.

High precision timepiece pace measuring device

A pulse motor comprising a rotor having at least two magnetization axes extending parallel to a shaft of the rotor and angularly spaced apart at a uniform interval, the direction of magnetization of each magnetization axis being opposite to that of the adjacent magnetization axis; a pair of upper stators extending above the rotor and defining two upper gaps between them, said upper gaps being adapted to face respective unlike polarity poles on the upper side of the rotor; a pair of lower stators extending below the rotor and defining two lower gaps between them, said lower gaps being adapted to face respective unlike polarity poles on the lower side of the rotor; and at least one drive coil for magnetizing the upper and lower pair stators alternately to opposite polarities such that the polarity of one of the upper pair stators and one of the lower pair stators is opposite to the polarity of the other upper and lower stators.

Growing community of inventors

Ena, Japan

Akira Kikuyama