Optical navigation device with illumination optics having an image outside a detector field of view
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United States of America Patent
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Apr 2, 2013
Grant Date -
May 12, 2011
app pub date -
Nov 6, 2009
filing date -
Nov 6, 2009
priority date (Note) -
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Abstract
An optical navigation device includes an image sensor, a light source, and illumination optics. The image sensor generates images of a tracking surface. The image sensor has a field of view via imaging optics interposed between the image sensor and the tracking surface. The light source generates light to illuminate a portion of the tracking surface. The illumination optics are interposed between the light source and the tracking surface to direct the light from the light source toward the tracking surface. The illumination optics include an output surface with a primary region illuminated above a threshold intensity. The illumination optics are located relative to the tracking surface so that an image of the output surface excludes the primary region from the field of view of the image sensor.
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