Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-07-09
1996-05-07
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 63, 359 73, G02F 11335
Patent
active
055151868
ABSTRACT:
A welding helmet and lens therefor includes a shield and a lens including a two identical optical components, each including a polarizer, a further polarizer (analyzer) optically between said optical components and effectively shared as an output device from one optical component and an input device for the other optical component, the transmissive axes of respective polarizers of said optical components being operatively oriented relative to one another to improve extinction of light incident on said lens at prescribed angles. The lens may be used in other optical systems. A method of making a light transmission controlling optical system employing two optical components control device, includes assembling a plurality of identical optical components, each having substantially identical alignment characteristics, positioning at least two of the optical components in optical series such that at least one optical component is facing in a direction opposite the facing direction of the other optical component, whereby the polar alignment of at least one part of both of said optical components is equi-angular and opposite sense relative to a reference direction.
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Sharp, et al, "Continuously Tunable Smectic A Liquid-Crystal Color Filter, May 1990", Optics Letters, v. 15, No. 10, pp. 523-525.
Berman Arthur L.
Fergason James L.
Fergason Jeffrey K.
Fergason John D.
OSD Envizion Company
Sikes William L.
Trice Ron
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