Disc clamping device

A disc drive including a housing base plate, a spindle motor having a spindle extending up through said base plate for rotating a disc at a constant speed, a hub on the top of said spindle for supporting a disc for rotation, said hub including a flat, flared surface for supporting a disc, and a cylindrical section above said flared surface so that said disc is slidable over said cylindrical section of said hub to rest on said flared surface, the improvement comprising an annular groove of a given height proximate the top of said cylindrical section, the upper surface of said annular groove being interrupted by recesses extending inwardly from an outer diameter of said cylindrical section to define lobes spaced around said upper surface, and a wave washer having an outer diameter sufficient to engage the upper surface of said disc as said disc rests on said flared surface, and an inner diameter substantially the same as said outer diameter of said cylindrical section, and said disc inner diameter, said washer inner diameter being interrupted by inwardly extending tabs corresponding to and appropriate for engagement with said recesses in said upper surface of said annular groove, said wave washer being placed on said hub by aligning said inwardly extending tabs with said recesses in said upper surface of said annular groove, passing said washer over the top of said hub to substantially align said washer with said groove, and rotating said washer to capture said tabs under said lobes whereby said wave washer is compressed and biased against said disc and against said lobes by the spring effect of said wave washer.