Brinks Hofer Gilson & Lione
Keyboard assembly having highly waterproof key switches
 In the keyboard assembly, post-like support members are formed sideways of each of the key top housings corresponding to key tops to which torsion bars are attached respectively, out of plural key top housings, the support members being erected integrally from a housing plate and having a hollow structure, through holes are formed respectively in base end portions of the support members so as to extend through the housing plate, and a sheet member is disposed on a back side of the housing plate, the sheet member comprising waterproofing protuberances for closing the through holes in a waterproof manner, spring portions for pushing back the key tops upward, and a sheet body portion which renders the spring portions and the waterproofing protuberances integral with each other. 
Alps Electric Co., Ltd.
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Akio Hideki
Nishijima Ito