Citizen Watch Company, Ltd.

Ken Kitamura

Akira Kato

Shuji Naka

Yoshiyasu Watanabe

Yohsuke Noma

A radio wave watch includes: an exterior case; a dial plate disposed within the exterior case; a substrate disposed on a rear side of the dial plate within the exterior case; a first ground layer disposed on the substrate; an antenna that has a planar emitting electrode disposed between a center of the exterior case and an inner wall surface of the exterior case and opposed to the first ground layer, a planar short-circuit part electrically connecting an end part of the emitting electrode to the first ground layer, and a connecting part connecting the emitting electrode to a receiving circuit of the substrate; and a second ground layer disposed on an opposite side to the emission electrode side across the short-circuit part on the substrate and having a width equal to or greater than a width of the short-circuit part.

Radio wave watch

A portable radio-controlled watch includes a watch glass, an antenna that is formed on a backside of a circumference of the watch glass so as to be along the circumference, a feeder electrode adjacent to the antenna, a receiving circuit, an antenna connecting line that is at least a part of a connection circuit connecting the feeder electrode with the receiving circuit, where the antenna connecting line is directly connected to a back surface of the feeder electrode and extends in a direction away from the watch glass, and a dielectric that is disposed below the antenna and covers at least a part of the antenna in a plan view.

Portable radio-controlled watch

In a satellite radio-controlled wristwatch, processing ranging from a user's operation through a reception operation to the completion of time adjustment is rapidly accomplished. The satellite radio-controlled wristwatch according to the present invention includes: a satellite radio wave reception unit including an antenna, a high frequency circuit, and a decoder circuit; an analog indication member for indicating at least that a reception operation is in process and a reception result; a clock circuit for holding and counting an internal time; an operating member for receiving an operation of a user; and a controller for controlling timings of at least: an activation operation of activating the satellite radio wave reception unit; an acquisition and tracking operation of acquiring and tracking a certain satellite radio wave; a time information acquisition operation of acquiring time information from the satellite radio wave; a continuous operation detection operation of detecting that the operating member is operated continuously; and a reception indication movement operation of moving the analog indication member to a position indicating that the reception operation is in progress, the controller being configured to carry out such control that the reception indication movement operation overlaps with at least one of the activation operation or the acquisition and tracking operation.

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Nishitokyo, Japan

Ken Kitamura