Touch type contactless switch structure for electronic wristwatches having insulative member precluding establishment of shunt path by foreign matter

In an electronic wristwatch including an enclosure, a viewing window and movements accommodated within the interior of the enclosure, a touch type contactless switch structure operated by the wearer of the watch comprising:

• a film of transparent electrode disposed on the viewing window for engagement with a portion of the body of the wearer, said electrode film serving as one electrode of said contactless switch structure;
• said enclosure being engageable with the wrist of the wearer and made of electrically conductive material for serving as another electrode of said contactless switch structure;
• an insulating member provided between the electrode film and the enclosure for establishing electrical isolation therebetween;
• and
• an extension provided at the one end of the insulating member in a position to overlay the electrode film and thus the viewing window in an amount sufficient to preclude establishment of a shunt path between said electrodes by the accumulation of foreign material on said insulating member.