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:
Oct. 27, 2015
Filed:
Jul. 10, 2013
Citizen Holdings Co., Ltd., Tokyo, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Akira Kato, Sayama, JP;
CITIZEN HOLDINGS CO., LTD., Tokyo, JP;
CITIZEN WATCH CO., LTD., Tokyo, JP;
Abstract
In a satellite radio-controlled wristwatch, a time to be spent on acquisition and tracking is reduced and also a reception success probability is increased. A satellite radio-controlled wristwatch according to the present invention includes: a satellite radio wave reception unit including an antenna for receiving a satellite radio wave, a high frequency circuit, and a decoder circuit; a clock circuit for holding and counting an internal time; and a controller for controlling timings of at least: an activation operation of supplying power to the satellite radio wave reception unit for activation thereof; an acquisition and tracking operation of acquiring and tracking a certain satellite radio wave by the satellite radio wave reception unit; and a time information acquisition operation of acquiring time information from the satellite radio wave received by the satellite radio wave reception unit, the controller being configured to: wait for arrival of an activation time point, which is inversely calculated by subtracting an acquisition and tracking time period and an activation time period from a time information receivable time point that is predicted based on the internal time, and then start the activation operation; and vary the acquisition and tracking time period depending on a predetermined condition.