Multi-layer printed circuit board for a keyboard
OwnerHuo-Lu Tsaiinventor
Life of this patent
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Abstract
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.
Claims14
A multi-layer printed circuit board for a keyboard, comprising:
- an upper layer having multiple circular lines and a bottom;
- a lower layer having multiple circular lines and a top;
- an insulating separation layer positioned between the upper and lower layers and having multiple through holes, a top side and a bottom side;
- multiple thin film switches each of which has two thin conductive elements formed on the upper layer and the lower layer, and aligned with one of the through holes in the insulating separation layer;
- and
- multiple spacers positioned between one of the upper and lower layers and the insulating separation layer, wherein each spacer corresponds to one of the through holes.
A multi-layer printed circuit board of a keyboard, comprising:
- an upper layer having multiple circular lines and a bottom;
- a lower layer having multiple circular lines and a top;
- an insulating separation layer positioned between the upper and lower layers, having multiple through holes, a top side and a bottom side;
- multiple thin film switches each of which has two thin conductive elements formed on the upper layer and the lower layer, and aligned with one of the through holes;
- and
- multiple spacers positioned among the upper layer, the lower layers and the insulating separation layer, wherein each spacer corresponds to one of the through holes.
Dependencies are inferred from the claim text.