Reflective mode ultrasonic touch sensitive switch

Details Reflective mode ultrasonic touch sensitive switch Reflective mode ultrasonic touch sensitive switch

1995-08-24

1997-09-30

Hofsass, Jeffery

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 34, 178 18, 178 19, 310318, 310328, H03K 1794

Patent

active

056730411

ABSTRACT:
A touch sensitive switch is fabricated from a substrate having a touch region on a first surface and a piezoelectric element on a second surface of the substrate. The piezoelectric element is driven by a signal configured so that an ultrasonic wave generated by the element is transmitted into the substrate and is reflected back and forth into the substrate at both surfaces. A touch changes the reflectivity at the first surface, and influences the impedance of the transducer assembly which is comprised of the piezoelectric element and the substrate.

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