Metal dome switch assembly with enhanced snap ratio

Details Metal dome switch assembly with enhanced snap ratio Metal dome switch assembly with enhanced snap ratio

2008-05-27

2008-05-27

Lee, K. Richard (Department: 2832)

Electricity: circuit makers and breakers

Solid contact

Membrane type

C200S512000, C200S406000

Reexamination Certificate

active

07378609

ABSTRACT:
A metal dome switch assembly with a good snap ratio and having a desired click characteristic near to that of an isolated metal dome includes a carrier base layer and adhesive layer which have a plurality of holes bounded by annular sections which engage the lower outer surfaces of the domes and are larger than the keypad actuation posts, at positions corresponding to fixed contact points on a circuit board. The switch array is especially important in cell phone designs where the snap ratio, tactile feel, is desirable. The switch array can also incorporate an electroluminescent (EL) lamp while still improving the snap ratio.

REFERENCES:
patent: 5986228 (1999-11-01), Okamoto et al.
patent: 6595653 (2003-07-01), Saito et al.
patent: 6730869 (2004-05-01), Teruyama et al.
patent: 6917007 (2005-07-01), Hirai et al.
patent: 7075025 (2006-07-01), Tomitsuka et al.

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