Geometric optimization of a tongue-operated switch array

An oral tactile interface provides an approach for silent and hands-free communication between humans or between human and machine. An efficient tongue-operated switch array (TOSA), which provides an alternate input or manipulating method for a computer or operative system, is described. A TOSA has been designed and fabricated using printed circuit board technology and a membrane-switching mechanism, and is integrated with a dental palate mold made from a silicone impression material. The TOSA has four switches laid out in cardinal directions with a fifth switch in the center. Human subject experiments have been conducted to evaluate device performance. The characteristics of tactile sensation and mobility of the tongue are used to quantify the performance and optimize the geometric design of the TOSA. Results indicate that operation on all switches are highly accurate and fast enough for use as an alternative input method.