| 摘要 |
A key assembly (10) comprises a depressible key (16) having a depending projection (22), a pair of electrical terminals (36), and a domed contact membrane (30) snappable between two positions for making and breaking electrical connection between the electrical terminals. The depression of the key (16) causes the projection (22) to urge the contact membrane (30) to snap from a first natural-bias position (FIG. 2(a)) in which the electrical terminals are not electrically connected to a second distorted position (FIG. 2(b)) in which the electrical terminals are connected. The projection comprises an annular flange confronting the contact membrane and laterally spaced apart from the apex (33) of the dome (32).
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