Invention Grant
- Patent Title: Timepiece, electronic device, and method of determining illuminance of timepiece
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Application No.: US16135600Application Date: 2018-09-19
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Publication No.: US11237524B2Publication Date: 2022-02-01
- Inventor: Kazuo Kato
- Applicant: Seiko Instruments Inc.
- Applicant Address: JP Chiba
- Assignee: Seiko Instruments Inc.
- Current Assignee: Seiko Instruments Inc.
- Current Assignee Address: JP Chiba
- Agency: Crowell & Moring LLP
- Priority: JPJP2017-181684 20170921,JPJP2018-170507 20180912
- Main IPC: G04G19/08
- IPC: G04G19/08 ; G04C10/02 ; G01J1/42 ; H02S40/38 ; G04C10/04
Abstract:
Provided is a timepiece including a solar cell that has a solar panel, a secondary battery that is charged from the solar cell, an overcharge prevention circuit that detects a charged state of the secondary battery, and a control unit that short-circuits the solar cell and determines that illuminance of light illuminating the solar panel is equal to or higher than predetermined illuminance in a case where the overcharge prevention circuit is detected to be in an overcharge state.
Public/Granted literature
- US20190086874A1 TIMEPIECE, ELECTRONIC DEVICE, AND METHOD OF DETERMINING ILLUMINANCE OF TIMEPIECE Public/Granted day:2019-03-21
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