Electronic timepiece with internal antenna
An electronic timepiece has a tubular outside case of which at least part is a conductive material, a transparent crystal, a dial housed in the outside case, an annular antenna body disposed around the dial, a feed part that feeds the antenna body, and a dial ring made of a non-conductive material covering the antenna body. The antenna body includes an annular dielectric base, and an arc-shaped fed element feed by the feed part, an annular parasitic element disposed between the dial ring and crystal, and receives circularly polarized waves.
1. An electronic timepiece with internal antenna, comprising:
a tubular outside case of which at least part is made from a conductive material;
a cover member that covers one of two openings in the case;
a time display unit housed inside the case;
an annular antenna body disposed around the time display unit;
a feed part that feeds the antenna body; and
a non-conductive ring member that covers the antenna;
wherein the antenna body includes an annular dielectric base and an arc-shaped fed element that is fed by the feed part, and
an annular parasitic element is disposed between the ring member and the cover member, and receives circularly polarized waves.
2. The electronic timepiece with internal antenna described in claim 1 , wherein:
the antenna body and the parasitic element are mutually superimposed in plan view.
3. The electronic timepiece with internal antenna described in claim 2 , wherein:
the parasitic element is disposed on the cover member side of the ring member.
4. The electronic timepiece with internal antenna described in claim 2 , wherein:
the parasitic element is affixed to an annular member, and the annular member is disposed to the cover member side of the ring member.
5. The electronic timepiece with internal antenna described in claim 1 , wherein:
the fed element is disposed on the cover member side of the antenna body.
6. The electronic timepiece with internal antenna described in claim 1 , wherein:
an annular blind member is disposed to the cover member so that the parasitic element is not visible from the outside.
7. The electronic timepiece with internal antenna described in claim 1 , wherein:
an annular blind member is affixed to the cover member side of the parasitic element so that the parasitic element is not visible.
8. The electronic timepiece with internal antenna described in claim 1 , further comprising:
a back cover made from a conductive material, the back cover being electrically connected to the outside case, and the back cover and the outside case functioning as the ground plane of the antenna body.
9. The electronic timepiece with internal antenna described in claim 1 , wherein:
the outside case has a bezel that is made from a non-conductive material and fastens the cover member.