Apparatus for minimizing beam collimation sensitivity in optical

Details Apparatus for minimizing beam collimation sensitivity in optical Apparatus for minimizing beam collimation sensitivity in optical

1981-06-01

1985-02-05

Corbin, John K.

350347E, G02F 1137, G02F 1135

Patent

active

044975422

ABSTRACT:
In an optical instrument including a birefringent liquid crystal cell of the type consisting of a pair of transparent plates and a zero-twist, nematic-phase, liquid crystal material with a positive dielectric anisotropy between the plates, the liquid crystal molecules being oriented in and tilting in a plane perpendicular to the cell plates, a beam of light being conducted through the cell, generally normal to the plates thereof, it has been observed that if all of the rays of the beam are not collimated, each ray will suffer a different retardation in passing through the cell and this is unacceptable in most applications. This problem is minimized, according to the present invention, by using a filament light source positioned with the filament axis normal to the plane of the tilting molecule axes or by using two liquid crystal cells between a pair of polarizers, one of the cells being rotated 180.degree. relative to the other about an axis normal to the plates thereof whereby the liquid crystal molecules of the cells tilt in opposite directions.

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