| 摘要 |
PURPOSE:To make the joint smart by edging the entire outercircumference of filter with macromolecular material to have C-shaped cross-section thereby eliminating chance to be removed from edged section. CONSTITUTION:Outercircumference of filter 1 is edged entirely with macromolecular material 2 to have C-shaped cross-section. One method is that thermo- shrinkage film such as polyvinyl chloride is employed to arrange a film larger than the filter 1 on the outercircumference of filter 1 then heat is applied to shrink and mount tightly on the filter 1. Consequently even if the filter has dropped during removal operation of filter, it will never be broken nor damage the computer keyboard. |
