Browse Prior Art Database

Touch Panel Using Elliptical Light Reflector

IP.com Disclosure Number: IPCOM000062767D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Neckyfarow, SW: AUTHOR [+2]

Abstract

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.

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Touch Panel Using Elliptical Light Reflector

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.

As indicated in the Figure, a touch panel 1 is shown from a front view, with mountings and covers removed to expose the touch sensing mechanism. A section 2 of an elliptical mirror (or reflector) is shown. A light source 3 is positioned at the 1 focus of the ellipse and a rotating detector 4 is located at the other focus of the ellipse 2. A touch on the touch panel 1 at point 5 is sensed by the two light paths referred to by the reference numerals 6 and 7. These light paths 6 and 7, being interrupted by the touch at point 5, caused no light to be sensed as the slit of the detector 4 passes thereby. Accordingly, the position of the touch 5 at the point can be determined uniquely and accurately as a result.

Disclosed anonymously.

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