Wavelength specific coating for mirrored optics and method for reducing reflection of white light
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United States of America Patent
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Nov 23, 2004
Grant Date -
Jan 15, 2004
app pub date -
Jun 2, 2003
filing date -
Oct 27, 2000
priority date (Note) -
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Abstract
An amorphous diamond coating applied onto mirrored optics in an infrared motion sensor to block specific wavelengths of energy from a 'white light' source like a halogen lamp, without reducing the reflectivity of the mirror surface in the Mid-Infrared wavelengths. A specific thickness of diamond-like-coating is applied on top of the reflective metal surface of a mirrored part, thereby reducing the mirror's reflectivity at visible and near-Infrared wavelengths known to be problematic for IR motion sensors, such as those emitted from halogen lamps. The coating has no significant detrimental effect on mid-Infrared reflectivity, so the IR motion sensor's performance is otherwise unaffected.
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