Invention Grant
- Patent Title: Electronic watch
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Application No.: US16562765Application Date: 2019-09-06
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Publication No.: US11681260B2Publication Date: 2023-06-20
- Inventor: Toshinari Maeda , Shogo Kimura
- Applicant: CITIZEN WATCH CO., LTD.
- Applicant Address: JP Tokyo
- Assignee: CITIZEN WATCH CO., LTD.
- Current Assignee: CITIZEN WATCH CO., LTD.
- Current Assignee Address: JP Nishitokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP 2018168464 2018.09.10 JP 2019114248 2019.06.20
- Main IPC: G04C3/14
- IPC: G04C3/14 ; G04G19/12 ; G04C10/00 ; H02P29/40 ; H02K1/22 ; H02N1/00

Abstract:
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.
Public/Granted literature
- US20200081404A1 ELECTRONIC WATCH Public/Granted day:2020-03-12
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