The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 16, 2021
Filed:
Mar. 24, 2020
Seiko Epson Corporation, Tokyo, JP;
Takashi Kawaguchi, Shiojiri, JP;
Abstract
An electronic timepiece detects an external magnetic field without using a magnetic sensor. The electronic timepiece has a driver that drives a motor; a current detector that detects a current value flowing through a coil of the motor; a controller that controls the driver to the on state or the off state according to the detected current value; a polarity changer that alternately changes the polarity of the drive current to a first polarity and a second polarity when an on time, which is a continuous time of the on state, meets a specific condition; a counter that counts the number of on states in the first polarity and the number of on states in the second polarity; and an external magnetic field detector that detects an external magnetic field based on a result of comparing the counted number of on states in the first polarity and the second polarity.