Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1997-03-03
1998-09-15
Epps, Georgia Y.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359267, G02F 115
Patent
active
058087770
ABSTRACT:
A rearview mirror system for a vehicle having an electrochromic reflective element and heating means for uniformly heating substantially the entire reflectance surface in order to promote uniform coloration of the reflectance surface to a desired reflectance level. The reflective element is illustrated as an all solid-state electrochromic element having a large area reflectance surface for use as the exterior mirrors of a truck or other large vehicle. The application of energy to the heater can be controlled on the basis of a low ambient light condition and an ambient temperature that is low but not necessarily freezing, such as between 5.degree. C. and 20.degree. C. The heater can be resistance film that is evenly covering a surface of the reflective element and divided into first and second regions by an insulating break in the resistance film. Energy may be applied to one region in order to heat the reflectance element at a high rate to remove frost and dew. Energy may be applied to both regions in order to apply heat at a lower rate for even coloration of the mirror.
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Hansen Michael A.
Lynam Niall R.
O'Farrell Desmond J.
Schierbeek Kenneth L.
Bey Dawn-Marie
Donnelly Corporation
Epps Georgia Y.
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