Incidence angle light attenuator for light transmissive panels

Details Incidence angle light attenuator for light transmissive panels Incidence angle light attenuator for light transmissive panels

1991-09-03

1993-02-23

Hannaher, Constantine

Optical: systems and elements

Polarization without modulation

Polarization by birefringence

359501, 359493, G02F 101

Patent

active

051895528

ABSTRACT:
A method and apparatus for controlling light attenuation through a light transmissive panel uses polarized film sheets positioned on opposing surfaces of the panel. The film sheet comprises alternating strips or fields of film of different polarization so chosen that light passing through strips of different polarization is significantly attenuated whereas light passing through strips of the same polarization is only attenuated to a preselected degree. The film sheets are oriented on the opposing surfaces of the panel such that light passing through within a preselected range of incidence angles passes through strips of common polarization. Light impinging on the panel at other incidence angles passes through strips of different polarization and is significantly polarized or may have varying polarization in order to provide an attenuation within step changes. The panel may comprise automobile window glass for attenuating sunlight while allowing substantially unattenuated horizontal viewing or may be applied vertically to auto headlamps for reducing glare directed toward approaching vehicles.

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patent: 4893908 (1990-01-01), Wolf et al.

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