公开(公告)号：US11108258B2

公开(公告)日：2021-08-31

申请号：US16278523

申请日：2019-02-18

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Fumiaki Ochiai ,  Yoshinori Asami ,  Yohei Kawaguchi ,  Katsuhiko Obata

IPC: H02J7/00 ,  G04G19/06 ,  H01M10/48 ,  G01R19/165 ,  G01R31/36 ,  H02J7/35 ,  G01R31/3842

Abstract: An electronic timepiece includes a secondary battery, a first power feeder, a second power feeder, and a processor. The first power feeder feeds power to the secondary battery. The second power feeder feeds power to the secondary battery at a current larger than a current fed by the first power feeder. The processor determines remaining power of the secondary battery based on different references that are a reference of when the first power feeder is feeding the power to the secondary battery and a reference of when the second power feeder is feeding the power to the secondary battery.

公开(公告)号：US10459408B2

公开(公告)日：2019-10-29

申请号：US15885238

申请日：2018-01-31

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Kosuke Hasegawa ,  Yohei Kawaguchi ,  Katsuhiko Obata ,  Mitsuaki Matsuo ,  Shimpei Matsuda

IPC: G04G21/04 ,  G04R20/26 ,  G04G9/00 ,  G04R20/04 ,  G04C10/00 ,  G04R60/06

Abstract: An electronic timepiece, including: a counter; a display section; a first processor; a second processor; and a power supply section which supplies electric power to each section from a battery, wherein when an output voltage from the power supply section decreases to less than a predetermined first reference voltage, the first processor stops a display operation by the display section, when the time information is acquired by the processing operation of the second processor, the first processor corrects the time counted by the counter based on the acquired time information and causes the display section to display the corrected time, and when the output voltage decreases to less than the first reference voltage following an acquisition operation of the time information by the second processor, the first processor does not stop a time display operation during a predetermined pending period.

公开(公告)号：US10014806B2

公开(公告)日：2018-07-03

申请号：US15009679

申请日：2016-01-28

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Yohei Kawaguchi ,  Yuta Saito

IPC: G04C3/14 ,  H02P8/12 ,  H02P8/02

CPC classification number: H02P8/12 ,  G04C3/143 ,  G04C3/146 ,  H02P8/02

Abstract: A stepping motor driving device drives a first coil and a second coil. The stepping motor driving device includes a motor control unit. The motor control unit applies a predetermined voltage to the first coil in a first phase, applies the predetermined voltage to the second coil in a second phase after the first phase, and alternately applies the predetermined voltage to the first coil and the second coil in a third phase after the second phase.

公开(公告)号：US09785117B2

公开(公告)日：2017-10-10

申请号：US15214695

申请日：2016-07-20

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Yohei Kawaguchi ,  Fumiaki Ochiai ,  Yuta Saito

IPC: G04C3/14 ,  H02P8/02 ,  H02P8/32 ,  H02P8/12

CPC classification number: G04C3/14 ,  G04C3/143 ,  H02P8/02 ,  H02P8/12 ,  H02P8/32

Abstract: A motor drive device includes a driver unit configured to be connected to a stepping motor, and a controller connected to the driver unit. The controller causes the driver unit to output a drive pulse to the stepping motor for causing the stepping motor to rotate stepwise in a prescribed rotation direction. The controller detects, through the driver unit, a current induced by a counter-electromotive force generated in the stepping motor in response to the drive pulse. The controller causes the driver unit to apply a counter pulse having the same electrical polarity as the drive pulse to the stepping motor so as to suppress an amount of the current induced by the counter-electromotive force when the stepping motor is not rotating in response to the drive pulse so that the amount of the induced current detectably differs between when the stepping motor is rotating and not rotating.

公开(公告)号：US12189339B2

公开(公告)日：2025-01-07

申请号：US16952892

申请日：2020-11-19

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Yuta Saito ,  Yohei Kawaguchi ,  Fumiaki Ochiai

IPC: G04C3/14 ,  G04B19/02 ,  G04C3/00 ,  H02P8/02

Abstract: An electronic watch includes a pointer; a stepping motor including a coil and configured to drive the pointer; a driving circuit configured to drive the stepping motor; an A/D converter configured to detect electromotive force generated in the coil due to an impact; and a CPU configured to control driving of the driving circuit. The CPU determines a direction in which the pointer is likely to be shifted, based on the electromotive force detected by the A/D converter, determines whether the pointer is shifted due to the impact, and upon determining that the pointer is shifted, corrects a position of the pointer in accordance with the direction in which the pointer is likely to be shifted.

公开(公告)号：US12169735B2

公开(公告)日：2024-12-17

申请号：US18068134

申请日：2022-12-19

Applicant: CASIO COMPUTER CO., LTD.

Inventor： Yohei Kawaguchi ,  Keiichi Nomura ,  Fumiaki Ochiai ,  Tatsuya Sekitsuka

IPC: G06F9/48 ,  G06F1/28

Abstract: An electronic device includes: a memory configured to a program; and one or more processors configured to execute the program stored in the memory. The one or more processors are connected to a first circuit and a second circuit, the first circuit being configured to execute a first operation cyclically and output an interrupt signal corresponding to the first operation, the second circuit being configured to execute a second operation in response to an operation instruction. In response to receiving the interrupt signal, the one or more processors output the operation instruction to the second circuit such that the second operation is not executed in a period in which the first operation affects the second operation.