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US 6,541,724 B2Granted
Key switch
AssigneeOki Electric Industry Co., Ltd.
InventorsYuichiro Nozawa, Zenzo Tozuka
Life of this patent
Estimating the term…
Abstract
A key switch includes an elastic member having a circular open end and a membrane sheet on which the elastic member is disposed. The membrane sheet includes two flexible sheets and an insulating resin sheet sandwiched between them. The insulating sheet includes an opening, which has a shape different from that of the open end.
Claims14
A key switch, comprising
- a first sheet having a fixed contact pad;
- a second sheet having a moveable contact pad that faces the fixed contact pad;
- a film sandwiched between the first and second sheets, the film having an opening, which is located at the moveable and fixed contact pads;
- and
- an elastic member having a bell-shaped leg part and a contact depression part to contact the second sheet when pushed down, the elastic member being placed on the second sheet, and being disposed above the opening,
- wherein a part of a bottom face of the bell-shaped leg part faces the opening, and another part of the bottom face faces the film.
3 more elements
A key switch, comprising:
- a key top;
- an elastic member including a top part disposed under the key top, a bell-shaped spring leg having a circular open end, and a contact depression part located inside the bell-shaped spring leg;
- a first sheet, the first sheet including a top surface and a back surface, and the elastic member being placed on the top surface;
- a moveable contact pad formed on the back surface of the first sheet, the moveable contact pad being located at the center of the circular open end;
- a second sheet;
- a fixed contact pad formed on the second sheet, the fixed contact pad facing the moveable contact pad;
- and
- an insulating resin sheet sandwiched between the first and second sheets, the insulating resin sheet having an opening, the opening having a shape different from that of the circular open end of the bell-shaped spring leg, a shortest distance between a center of the opening and a periphery of the opening being shorter than half of an inside diameter of the circular open end, and a longest distance between the center of the opening and the periphery of the opening being longer than half of the inside diameter of the circular open end.
5 more elements
A key switch, comprising:
- a key top;
- an elastic member including a top part disposed under the key top, a bell-shaped spring leg having a circular open end, and a contact depression part located inside the bell-shaped spring leg;
- a first sheet, the first sheet including a top surface and a back surface, and the elastic member being placed on the top surface;
- a moveable contact pad formed on the back surface of the first sheet, the moveable contact pad being located at the center of the circular open end;
- a second sheet;
- a fixed contact pad formed on the second sheet, the fixed contact pad facing the moveable contact pad;
- and
- a first insulating resin sheet formed on the back surface of the first sheet, the first insulating resin sheet having a first circle-shaped opening whose diameter equals an external diameter of the circular open end of the bell-shaped spring leg;
- a second insulating resin sheet formed on the second sheet, the second insulating resin sheet including a second circle-shaped opening, which has a same size as the first circle-shaped opening, the centers of the first and second opening being located coaxially;
- a plurality of first extending parts projecting from the first insulating resin sheet toward the center of the first opening;
- and
- a plurality of second extending parts projecting from the second insulating resin sheet toward the center of the second opening,
- wherein the first and second insulating resin sheets and the first and second extending parts are sandwiched between the first and second sheets.
10 more elements
Dependencies are inferred from the claim text.