Touch Panel Using Elliptical Light Reflector
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
The location of a touch on a touch panel is detected by the breaking of two light rays scanned across the touch panels and reflected by an elliptical reflector from a rotating light source positioned at one focus of the ellipse to a detector located at the other focus of the ellipse. The timing of the intercepted light paths indicates where the point of contact with the touch panel has occurred.