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公开(公告)号：US11422511B2
公开(公告)日：2022-08-23
申请号：US16914498
申请日：2020-06-29
Applicant: CITIZEN WATCH CO., LTD.
Inventor： Yu Takyoh , Toshiaki Fukushima , Toshinari Maeda , Daisuke Iri , Daisuke Matsuoh , Masatoshi Nishida
Abstract: An electronic watch with a two-coil stepper motor including: a magnetized rotor; a stator including: first and second stator magnetic-pole portions, which are formed so as to oppose to each other through the rotor; and a third stator magnetic-pole portion, which is formed between the first stator magnetic-pole portion and the second stator magnetic-pole portion so as to face the rotor; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; and a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; and a high-speed drive pulse generation circuit configured to output a drive pulse for driving the rotor to the coil A or the coil B, and wherein the rotor is rotationally driven in increments of 360° due to a drive pulse train formed of the plurality of drive pulses.
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公开(公告)号：US10754299B2
公开(公告)日：2020-08-25
申请号：US16076690
申请日：2017-02-15
Applicant: CITIZEN WATCH CO., LTD.
Inventor： Yu Takyoh , Toshiaki Fukushima , Toshinari Maeda , Daisuke Iri , Daisuke Matsuoh , Masatoshi Nishida
Abstract: An electronic watch with a two-coil stepper motor including: a magnetized rotor; a stator including: first and second stator magnetic-pole portions, which are formed so as to oppose to each other through the rotor; and a third stator magnetic-pole portion, which is formed between the first stator magnetic-pole portion and the second stator magnetic-pole portion so as to face the rotor; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; and a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; and a high-speed drive pulse generation circuit configured to output a drive pulse for driving the rotor to the coil A or the coil B, and wherein the rotor is rotationally driven in increments of 360° due to a drive pulse train formed of the plurality of drive pulses.
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