摘要 |
<p>A touch sensitive electronic switch which has no moving parts and is actuated by the skin resistance of an operator causing a lowering of D.C. resistance across the switch is disclosed. The electronic switch, in the preferred embodiment shown, includes three electrodes laterally spaced and arranged with respect to each other upon an insulator. The second electrode is laterally spaced and insulated from the first electrode and arranged around and about the first electrode with the top surface of the second electrode rising above the level of the top surface of the first electrode. The third electrode is laterally spaced and insulated from both the first and second electrodes to provide a conductive electrical shielding electrode between the first and second electrodes. The first and second electrodes are exposed to the finger of an operator upon the top surface of the insulator in a manner that the operator's finger touching first the second electrode and then the first electrode allows a direct current path to be set up laterally between the first electrode and the second electrode to thereby provide a lowering of the D.C. resistance across the electronic switch. When the operator's finger is removed, the shielding effect of the third electrode prevents any leakage currents from flowing between the first electrode and the second electrode and establishing such a direct current path.</p> |