Optical position sensing system and optical position sensor assembly with convex imaging window
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United States of America Patent
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Mar 26, 2013
Grant Date -
Sep 24, 2009
app pub date -
Apr 23, 2009
filing date -
Jan 7, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
An optical position sensing system includes a bezel surrounding a display, a position sensor assembly, and a processor for calculating touch locations. Prismatic film may be applied to the bezel. Each optical position sensor assembly includes a body. A lens holder holds an imaging window on a first side and a single element aspherical lens on a second side. The imaging window has an inside face shaped to form a shallow convex surface. The lens holder is mounted to a front face of the body such that the lens is aligned with an opening in the body. An optical sensor is mounted to a rear face of the body and aligned with the opening. A radiation source is positioned within the body above the lens holder and behind an illumination window. A light path separator is positioned between the illumination window and the imaging window.
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