Sunlight attenuation visor

Details Sunlight attenuation visor Sunlight attenuation visor

2007-10-26

2011-12-27

Qi, Mike (Department: 2871)

Illumination

Supported by vehicle structure

Automobile

C362S509000, C362S512000, C349S013000

Reexamination Certificate

active

08083385

ABSTRACT:
An apparatus for attenuating the intensity of light transmitted through the apparatus is provided. In one embodiment, the apparatus may comprise a first polarizer having a first polarizing orientation and a second polarizer having a polarizing orientation perpendicular to the first polarizer. First and second electrodes are disposed between the polarizers and a nematic liquid crystal layer is disposed between the electrodes. At least one light detector positioned for measuring the intensity of the transmitted light may be positioned on an outer side of the second polarizer. A voltage controller in electrical communication with the light detector is provided for controlling the voltage level applied to the electrodes based on the intensity of the measured light wherein the voltage determines the amount of light transmitted through the apparatus.

REFERENCES:
patent: 2112726 (1936-07-01), Kemp et al.
patent: 3731986 (1973-05-01), Fergason
patent: 4641922 (1987-02-01), Jacob
patent: 5434690 (1995-07-01), Hisatake et al.
patent: 5460749 (1995-10-01), Terada et al.
patent: 7300167 (2007-11-01), Fernando et al.

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