Patent ID: 8456418
Filing Date: 2013-06-04
Classification: G06F

Abstract:
1. An apparatus for detecting a pointer within a region of interest comprising: a generally rectangular touch surface having an active sub-area defining said region of interest; a detecting device entirely spaced from said sub-area by a first margin and looking across said sub-area from one corner of said touch surface; at least one illumination source adjacent said detecting device and directing light at least across said region of interest; and a reflective element extending along one side of said touch surface and reflecting light towards said region of interest and towards said detecting device, said reflective element being spaced from said sub-area by a second margin, wherein when a pointer is positioned within said region of interest, said detecting device sees said pointer and a reflection of said pointer appearing in said reflective element, each margin being calculated such that the dimensions of the margins inhibit said detecting device from seeing a pointer within said region of interest that merges with said reflection to an extent that said pointer and reflection cannot be resolved.