Antenna, electronic device, and electronic timepiece
An antenna that has an annular shape in a plan view from a first direction and has at least an outer peripheral edge and an inner peripheral edge includes at least one latch on the inner peripheral edge. The inner peripheral edge has at least one first notch at which the inner peripheral edge is away from a center of the annular shape in the plan view.
1 . An antenna that has an annular shape in a plan view from a first direction and has at least an outer peripheral edge and an inner peripheral edge, the antenna comprising:
a top plate that has a first main surface that is visible in the plan view and which includes the outer peripheral edge and the inner peripheral edge;
a side wall that extends from at least a part of the outer peripheral edge of the top plate in the first direction and that has a second main surface that is visible from a second direction that is different from the first direction; and
at least one latch that is integral to the inner peripheral edge and that is bent downward in the first direction from the inner peripheral edge of the top plate so as to extend in the first direction,
wherein the inner peripheral edge has at least one first notch at which the inner peripheral edge is away from a center of the annular shape in the plan view, and
the side wall and the at least one latch extend in the first direction beyond a back surface of the top plate.
2 . The antenna according to claim 1 ,
wherein the latch is in the first notch.
3 . The antenna according to claim 1 ,
wherein the latch is arranged at each of three portions that are spaced in a peripheral direction of the inner peripheral edge of the antenna.
4 . The antenna according to claim 1 ,
wherein, at the at least one first notch, the inner peripheral edge is farther from the center of the annular shape than a predetermined reference position.
5 . The antenna according to claim 1 , wherein
the top plate has a second notch on the outer peripheral edge.
6 . The antenna according to claim 1 , wherein
the side wall has a third notch.
7 . An electronic device comprising:
the antenna according to claim 1 ; and
a device case that accommodates the antenna inside.
8 . The electronic device according to claim 7 ,
wherein the device case has a catch that is at a position protruding inward of the device case and corresponding to the latch.
9 . The electronic device according to claim 7 , further comprising a circuit board that is accommodated inside the device case, wherein:
at least part of the circuit board faces the back surface of the top plate of the antenna, and
at least part of the circuit board extends inward of an inner periphery of the antenna.
10 . An electronic timepiece comprising:
the antenna according to claim 1 ; and
a device case that accommodates the antenna inside.
11 . The electronic timepiece according to claim 10 ,
wherein the device case has a catch that is at a position protruding inward of the device case and corresponding to the latch.
12 . The electronic timepiece according to claim 10 , further comprising a circuit board that is accommodated inside the device case, wherein:
at least part of the circuit board faces the back surface of the top plate of the antenna, and
at least part of the circuit board extends inward of an inner periphery of the antenna.
13 . The antenna according to claim 1 , wherein only the side wall and the at least one latch extend in the first direction beyond the back surface of the top plate.