Coated copper reflector
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United States of America Patent
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-
Feb 19, 1980
Grant Date -
N/A
app pub date -
Feb 21, 1978
filing date -
Feb 21, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A reflector or mirror for the visible and rear infrared spectrum is formed by multicoating copper with one-fifth wavelength and three-quarter wavelength films. These films are alternating low and high index films, and MgF.sub.2 and TiO.sub.2 are presently preferred. A thin bonding layer of TiO.sub.2 is used to secure adhesion of the MgF.sub.2 to the copper. This coating enhances the reflectance in the visible range without appreciable degradation of reflectance in the near infrared, so that the resultant curve of reflectance-versus-frequency is substantially flat. The resulting coating is hard and tough and may be cleaned without injury and withstands high humidity.
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