| 摘要 |
A touch control potentiometer is formed of a lower lamina bearing on its upper surface a conductive trace of elongate outline, an upper lamina being flexible under digital pressure and bearing on its lower surface a second conductive trace aligned with the first trace and having the outline thereof, a central lamina being interposed between the upper and lower laminae and formed with an aperture aligned with the first and second traces and having an outline complementary to the outline common to them, one of the traces being formed of a material having relatively high electrical resistance, the other of the traces being formed of a material having relatively low electrical resistance, and a plurality of electrically conductive leads extending outwardly from the laminate and comprising first and second leads in contact with the said one trace at its ends, and a third lead in contact with said other trace at one end one of its ends. A cover lamina is superimposed upon the upper lamina, a static shield layer being carried by the cover lamina at its lower surface to draw off static charges, a graphic layer being carried by the cover lamina at its upper surface thereof and bearing printed indicia. Also disclosed is apparatus incorporating the potentiometer in a control system.
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