Optical navigation sensor including a spatial frequency filter
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United States of America Patent
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Jul 10, 2012
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N/A
app pub date -
Dec 24, 2008
filing date -
Dec 24, 2008
priority date (Note) -
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Abstract
An optical navigation sensor (ONS) is provided having a spatial frequency filter to transmit radiation at selected spatial frequencies while attenuating other, undesired frequencies and harmonics. The ONS includes a radiation source to transmit radiation toward a portion of a surface that diffusely reflects radiation incident thereon. The spatial frequency filter is disposed to receive radiation scattered from the surface, and, in one embodiment, includes a number of non-circular openings to pass radiation of at least one pre-selected frequency while attenuating other frequencies and harmonics of the pre-selected frequency.
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