| 摘要 |
An improved structure of printed circuit board (PCB) under a pushbutton. The PCB includes a base layer and an insulation membrane, wherein conductive portions and corresponding contact portions are printed on the base layer and the insulation membrane respectively. Insulation portions are printed on each contact portion along its circumference without the need to apply glue on a corridor between every pair of the conductive portions in the base layer and the contact portions in the insulation membrane when combining the insulation membrane to the base layer by gluing or direct printing. By this arrangement, an air channel can be reserved for being applicable to various button groups or waterproof membrane PCBs.
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