Movable contact element and panel switch formed using the same
A movable contact element includes a base sheet provided on its bottom surface with adhesive portions which are dotted around; an adhesive portion with a predetermined width which surrounds the entire edges of the base sheet; adhesive portions with a predetermined width which surround rectangular holes formed in the base sheet; and adhesive portions with a predetermined width which surround the circumferences of the circular movable contact points.
1. A movable contact element comprising:
a base sheet comprising a plurality of movable contact points, each of said movable contact points being made of an elastic metal thin plate and having a convex dome shape,
the base sheet being made of a flexible insulating resin and having a bottom surface,
the bottom surface having a plurality of first adhesive portions, each first adhesive portion separated from each other by a non-adhesive area,
the first adhesive portions fixing each of the movable contact points to the bottom surface of the base sheet,
the bottom surface having a plurality of second adhesive portions, each of said second adhesive portions surrounding a respective one of the plurality of movable contact points.
2. The movable contact element of claim 1 , wherein
each of the second adhesive portions is provided so as to surround an outline of a section of the non-adhesive portion and an outline of a non-adhesive coupling portion having a predetermined width,
the section of the non-adhesive portion surrounds a circumference of the movable contact point including a peripheral region of the movable contact point, and
the non-adhesive coupling portion connects at least two movable contact points.
3. The movable contact element of claim 1 , wherein
the base sheet is further provided, along edges of the bottom surface thereof, with a third adhesive portion having a predetermined width.
4. A panel switch comprising:
the movable contact element of claim 1 ; and
a plurality of sets of fixed contact points, each set of fixed contact points consisting of a pair of a central fixed contact points and an outer fixed contact point, the fixed contact point being disposed on a wiring board in such a manner as to correspond to a position of a corresponding one of the movable contact points of the movable contact element;
wherein each movable contact point is positioned so that a circumferential bottom edge thereof is placed on a corresponding one of the outer fixed contact points, and so that a top of each dome faces the corresponding central fixed contact point with a predetermined spacing therebetween.