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1. 发明授权

US10545459B2 Drive circuit for two-coil step motor, two-coil step motor, and electronic watch using these 有权
公开(公告)号：US10545459B2
公开(公告)日：2020-01-28
申请号：US15754295
申请日：2016-09-09
申请人： CITIZEN WATCH CO., LTD.
发明人： Yu Takyoh , Toshiaki Fukushima , Toshinari Maeda , Daisuke Iri , Daisuke Matsuoh
IPC分类号： H02P8/02 , G04C3/14
摘要： Provided is a drive circuit for a two-coil stepper motor, including: a rotor; a stator including first, second, and third stator magnetic-pole portions; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; a drive pulse generation circuit configured to output a drive pulse; a detection pulse generation circuit configured to output a detection pulse for detecting counter-electromotive currents generated in the coil A and the coil B; and a rotation detection circuit configured to receive a detection signal generated due to the detection pulse as input to determine whether or not the rotor has rotated.

2. 发明授权

US11422511B2 Step motor drive device and circuit 有权
公开(公告)号：US11422511B2
公开(公告)日：2022-08-23
申请号：US16914498
申请日：2020-06-29
申请人： CITIZEN WATCH CO., LTD.
发明人： Yu Takyoh , Toshiaki Fukushima , Toshinari Maeda , Daisuke Iri , Daisuke Matsuoh , Masatoshi Nishida
IPC分类号： H02P8/02 , G04C3/14 , G04C13/11
摘要： 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.

3. 发明授权

US11101748B2 Method of manufacturing an electrostatic induction transducer, electrostatic induction transducer, and wristwatch 有权
公开(公告)号：US11101748B2
公开(公告)日：2021-08-24
申请号：US16667895
申请日：2019-10-29
申请人： CITIZEN WATCH CO., LTD.
发明人： Toshinari Maeda , Makoto Watanabe , Yasuo Kitajima , Izumi Yamamoto
IPC分类号： H02N1/08 , H02N1/00 , G04C10/00
摘要： Provided is a method of manufacturing an electrostatic induction transducer, the method including: providing a conductive substrate; providing a first electret material film on a first surface of the conductive substrate; providing a second electret material film on a second surface of the conductive substrate; forming a through hole that penetrates the conductive substrate, the first electret material film, and the second electret material film; mounting a supported member being conductive to the conductive substrate while allowing the conductive substrate to move in an in-plane direction; and applying charges to the first electret material film and the second electret material film by a charging process.

4. 发明授权

US10754299B2 Electronic watch 有权
公开(公告)号：US10754299B2
公开(公告)日：2020-08-25
申请号：US16076690
申请日：2017-02-15
申请人： CITIZEN WATCH CO., LTD.
发明人： Yu Takyoh , Toshiaki Fukushima , Toshinari Maeda , Daisuke Iri , Daisuke Matsuoh , Masatoshi Nishida
IPC分类号： G04C3/14 , H02P8/02 , G04C13/11
摘要： 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.

5. 发明授权

US11681260B2 Electronic watch 有权
公开(公告)号：US11681260B2
公开(公告)日：2023-06-20
申请号：US16562765
申请日：2019-09-06
申请人： CITIZEN WATCH CO., LTD.
发明人： Toshinari Maeda , Shogo Kimura
IPC分类号： G04C3/14 , G04G19/12 , G04C10/00 , H02P29/40 , H02K1/22 , H02N1/00
CPC分类号： G04G19/12 , G04C3/14 , G04C10/00 , H02K1/22 , H02N1/002 , H02P29/40
摘要： An electronic watch includes a power source, an electrostatic motor including a rotor in which a plurality of electret films are arranged in a rotational direction and a plurality of fixed electrodes arranged in the rotational direction at positions facing the rotor, a hand rotating in conjunction with the rotation of the rotor, and a motor control circuit controlling the electrostatic motor. The motor control circuit selectively executes a hand movement mode for rotating the hand and a stop mode for keeping the hand stationary. In the stop mode, the motor control circuit keeps the rotor stationary through electrostatic forces exerted on the electret films from the fixed electrodes with the polarities of the fixed electrodes maintained.

6. 发明授权

US11303225B2 Electrostatic motor 有权
公开(公告)号：US11303225B2
公开(公告)日：2022-04-12
申请号：US16495385
申请日：2018-03-22
申请人： CITIZEN WATCH CO., LTD.
发明人： Toshinari Maeda , Akira Izumi
IPC分类号： H02N1/00
摘要： Provided is a small-sized electrostatic motor having a rotor capable of starting reliably to rotate forward. The electrostatic motor includes a rotor rotatable around a rotating shaft, charged portions formed radially around the rotating shaft on upper and lower surfaces of the rotor, first and second stators disposed to sandwich the rotor therebetween, and first sets and second sets of fixed electrodes respectively formed radially around the rotating shaft on the surfaces of the first and second stators facing the rotor and selectively energized according to drive pulses to rotate the rotor by electrostatic force generated between the charged portions and the fixed electrodes. The average number of sets of fixed electrodes simultaneously energized in one cycle of the drive pulses out of the first sets and second sets of fixed electrodes is equal to the average of the numbers of first sets and second sets of fixed electrodes.

7. 发明授权

US11086273B2 Drive circuit for two-coil step motor 有权
公开(公告)号：US11086273B2
公开(公告)日：2021-08-10
申请号：US16579831
申请日：2019-09-24
申请人： CITIZEN WATCH CO., LTD.
发明人： Yu Takyoh , Toshiaki Fukushima , Toshinari Maeda , Daisuke Iri , Daisuke Matsuoh
IPC分类号： G04C3/14 , H02P8/02 , H02P8/16
摘要： Provided is a drive circuit for a two-coil stepper motor, including: a rotor; a stator including first, second, and third stator magnetic-pole portions; a coil A to be magnetically coupled to the first stator magnetic-pole portion and the third stator magnetic-pole portion; a coil B to be magnetically coupled to the second stator magnetic-pole portion and the third stator magnetic-pole portion; a drive pulse generation circuit configured to output a drive pulse; a detection pulse generation circuit configured to output a detection pulse for detecting counter-electromotive currents generated in the coil A and the coil B; and a rotation detection circuit configured to receive a detection signal generated due to the detection pulse as input to determine whether or not the rotor has rotated.

8. 发明授权

US10197972B2 Drive circuit for two-coil step motor 有权
公开(公告)号：US10197972B2
公开(公告)日：2019-02-05
申请号：US15538658
申请日：2015-12-24
申请人： CITIZEN WATCH CO., LTD.
发明人： Toshiaki Fukushima , Toshinari Maeda , Yu Takyoh , Daisuke Iri
IPC分类号： G04C3/14 , H02K37/16 , H02P8/34 , H02P8/02 , H02P8/30 , H02P6/182
摘要： Provided is a drive circuit for a two-coil stepper motor, including a rotor that is magnetized to an N-pole and an S-pole, first, second, and third stator magnetic-pole portions, a coil A, and a coil B. The drive circuit includes a drive pulse generation circuit configured to output a drive pulse (SP) for driving the coil A and the coil B, a detection pulse generation circuit configured to output a detection pulse (CP) to the coil A and the coil B in order to detect counter-electromotive currents generated in the coil A and the coil B along with a movement of the rotor after the rotor is driven based on the drive pulse, and a detection circuit configured to receive a detection signal (CS) generated based on the detection pulse as input, to thereby detect the movement of the rotor. At least one of the detection pulse to the coil A or the detection pulse to the coil B is output.

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