Means for rotating the polarization planh; of light and for converting polarized light to non-polarized light
Abstract
Abstract A LIGHT TRANSMISSIVE DEVICE WHICH WILL ROTATE THE PLANE OF POLARIZED LIGHT AND WILL ALSO DE-POLARIZE PLANE POLARIZED LIGHT PASSED THROUGH THE DEVICE, SAID DEVICE COMPRISING A PAIR OF DIRECTIONALLY ORIENTED SUPPORTING SURFACES SUCH AS UNIDIRECTIONALLY RUBBED GLASS OR PLASTIC PLATES, ROTATABLE RELATIVE TO EACH OTHER AND SEPRATED BY A THIN FILM OF A NON-OPTICALLY ACTIVE NEMATIC LIQUID CRYSTAL MATERIAL, THEDEVICE ACTING TO ROTATE THE PLANE OF THE POLARIZED LIGHT WHEN THE DIRECTIONALLY ORIENTED SURFACE FIRST CONTACTED BY THE ENTERING LIGHT IS EITHER PARALLEL OR PERPENDICULAR TO THE PLANE OF POLARIZATION OF THE ENTERING LIGHT AND THE REMAINING DIRECTIONALLY ORIENTED SURFACE IS ROTATED SO AS TO BRING ITS ORIENTED SURFACE TO THE DESIRED PLANE OF POLARIZATION FOR THE EXITING LIGHT, THE DEVICE ALSO ACTING TO CONVERT PLANE POLARIZED LIGHT TO NON-POLARIZED LIGHT WHEN THEORIENTED SURFACE FIRST CONTACTED BY THE ENTERING LIGHT LIES AT AN ANGLE OF 45* WITH RESPECT TO THE PLANE OF POLARIZATION OF THE ENTERING LIGHT AND THE DIRECTIONALLY ORIENTED SURFACES ARE PARALLEL TO EACH OTHER.
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