Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-02-08
1993-05-04
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 63, 359 85, G02F 1133
Patent
active
052086887
ABSTRACT:
Light transmission control device includes band pass filter for transmitting light of a wavelength or group of wavelengths and partially blocking transmission of light of a different wavelength or group of wavelengths, and variable optical filter for controllably transmitting light of a wavelength or group of wavelengths, the band pass filter and variable optical filter being cooperative to provide at least three light transmitting modes, including maximum transmission, minimum transmission, and a third mode less transmissive than the maximum, the device being operative to minimum transmissive mode upon being driven by a maximum energy input, the device also being operative to maximum transmissive mode upon being driven by a lesser energy input, and such third transmission mode occurring in response to no power or a failure of power or adequate power for energizing the device to the maximum or minimum transmissive mode.
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Berman Arthur L.
Fergason James L.
Fergason Jeffrey K.
Fergason John D.
OSD Envizion Company
Sikes William L.
Trice Ron
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