Multi-cavity Fabry-Perot ambient light filter apparatus
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United States of America Patent
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Apr 21, 2009
Grant Date -
Aug 17, 2006
app pub date -
Jul 6, 2005
filing date -
Feb 17, 2005
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Abstract
The present invention provides a multi-cavity Fabry-Perot ambient light filter apparatus. The multi-cavity Fabry-Perot ambient light filter apparatus comprises a plurality of Fabry-Perot cavities, each of the plurality of Fabry-Perot cavities covering one of a plurality of photodiodes; wherein each of the plurality of Fabry-Perot cavities has two partially reflective layers and one interferometric layer sandwiching between the two partially reflective layers, and shares one of the two partially reflective layers with a neighboring Fabry-Perot cavity and thereby stair stacking with the neighboring Fabry-Perot cavity. The plurality of Fabry-Perot cavities are capable of blocking the ambient light except for a wavelength spectrum that is recognizable for human eyes, thereby effectively accomplishes excellent IR blocking from non-visible light spectra.
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