| 摘要 |
A multi-layer printed circuit board for a keyboard has an upper and lower layers, an insolating separation positioned between the upper and lower layers, multiple thin film switches having two thin conductive element respectively formed on the upper and lower layer, and multiple spacers positioned between one of the upper and lower layer and the insolating layer. Since each spacer can be selectively formed on the upper layer, lower layer or insolating separation and corresponds to one of the through holes in the insolating separation, the spacers increase a distance between the two thin conductive elements of each thin film switch. Therefore, the sensitivity of touch of the multi-layer PCB can be adjusted by different arrangements of the spacers.
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