US 11,656,582 B2
Radio wave watch
Yoshiyasu Watanabe, Koganei (JP); Ken Kitamura, Nishitokyo (JP); Shuji Naka, Fuchu (JP); and Akira Kato, Tokorozawa (JP)
Assigned to CITIZEN WATCH CO., LTD., Nishitokyo (JP)
Appl. No. 16/753,437
Filed by CITIZEN WATCH CO., LTD., Nishitokyo (JP)
PCT Filed Sep. 18, 2018, PCT No. PCT/JP2018/034461
§ 371(c)(1), (2) Date Apr. 3, 2020,
PCT Pub. No. WO2019/069673, PCT Pub. Date Apr. 11, 2019.
Claims priority of application No. JP2017-194336 (JP), filed on Oct. 4, 2017.
Prior Publication US 2020/0319605 A1, Oct. 8, 2020
Int. Cl. G04R 60/12 (2013.01); G04C 10/02 (2006.01); G04G 17/04 (2006.01); G04R 20/02 (2013.01)
CPC G04R 60/12 (2013.01) [G04C 10/02 (2013.01); G04G 17/04 (2013.01); G04R 20/02 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A radio wave watch comprising:
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 emitting 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.