Patent ID: 6882865

Claim:
A fixing structure for input keys, applied in PDA with function of a mobile telephone, wherein comprising: a case, in which are provided opening and a plurality of through holes respectively, and on the backside of said case are provided a plurality of positioning elements and plurality of thermomeltable elements, said positioning elements are used to partition circuit board positioning region; an elastic sheet, set up in said circuit board positioning region, on said elastic sheet a plurality of keys are mounted and protruded, said keys are just exposed out respectively from a plurality of through holes of the case, and the backs of said keys are each provided with electric conductive layer; a plate, set on the back of said elastic sheet, and in said plate a plurality of venting passages are arranged around each key respectively; a circuit board, mounted on back of said plate, and a plurality of positioning holes are provided in said circuit board; a fixing plate, mounted on back of said circuit board, said fixing plate can be kept flat against the whole back of the case, a plurality of holes is provided on fixing plate, so that thermomeltable elements of the case are sheathed consecutively with elastic sheet, plate and circuit board, and one end of each said thermomeltable element is received in plurality of holes of the fixing plate respectively; a displaying screen, just fit in opening of said case; a bottom plate, kept flat against the whole backside of said fixing plate, and the components in said case are fixed by the arrangement of said bottom plate, which is also used to secure elastic sheet and circuit board.