Abstract: A method for simultaneous measuring a thickness of a liquid crystal layer and an average refractive index of the said liquid crystal in sealed liquid crystal cell is disclosed. The method is based on analysis of spectral positions of maxima and minima of interference oscillations, their magnitudes and their envelope in the spectrum of light mirrored by the liquid crystal cell at several different angles-of-incidence. The method is applicable to cells filled with different liquid crystals including cholesterics and smectics.

Abstract: A method for simultaneous measuring a thickness of a liquid crystal layer and an average refractive index of the said liquid crystal in sealed liquid crystal cell is disclosed. The method is based on analysis of spectral positions of maxima and minima of interference oscillations, their magnitudes and their envelope in the spectrum of light mirrored by the liquid crystal cell at several different angles-of-incidence. The method is applicable to cells filled with different liquid crystals including cholesterics and smectics.

Abstract: The present invention relates to a photochromic polymer for photo recording purposes comprising polymethacrylate, and having the following general formula: ##STR1## wherein R is --(CH.sub.2).sub.o --X--C.sub.6 H.sub.4 --Z--C.sub.6 H.sub.4 --R.sub.1,wherein R.sub.1 is an electron acceptor, such as cyano, alkoxy having 1 to 8 carbon atoms, halosubstituted alkoxy having 1 to 8 carbon atoms, halogen (F, Cl), hydroxy, esters of the formula--OOC--C.sub.n H.sub.2n-1, --CO--C.sub.n H.sub.2n-1, wherein n is 1 to 8, preferably 4 to 6, but excluding nitro, Br, I, and --SO.sub.3 H,X is selected from the group consisting of --O--, and --COO--,Z is selected from the group consisting of --N.dbd.N--, --CH.dbd.N--, or --CH.dbd.CH--, wherein --CH.dbd. of the --CH.dbd.N-- group is bound to the main part of the structure,R.sub.2 is C.sub.m H.sub.2m+1, wherein m is an integer 4 to 7,o is a number of 7 to 12, preferably 10, anda is number providing for a photo chromic polymer.

Abstract: A device for influencing light has a polarizer, a ferroelectric or electroclinic response type liquid crystal halfwave plate whose liquid crystals are in the smectic phase with bookshelf geometry and have molecular axes which are rotatable around a first direction corresponding to the direction of incoming light in response to an electric field applied across the electrodes on either side of the halfwave plate, a quarter wave retarder plate, and a mirror. The polarizer, plates and mirror are arranged such that incoming light is passed from the polarizer through the liquid crystal plate and the retarder plate, and is reflected by the mirror in a second direction opposite to the first direction back through the retarder and the liquid crystal plate so as to provide a reflected polarized light plane to the polarizer.

Abstract: A device for influencing light has a polarizer, a ferroelectric or electroclinic response type liquid crystal halfwave plate whose liquid crystals are in the smectic phase with bookshelf geometry and have molecular axes which are rotatable around a first direction corresponding to the direction of incoming light in response to an electric field applied across the electrodes on either side of the halfwave plate, a quarter wave retarder plate, and a mirror. The polarizer, plates and mirror are arranged such that incoming light is passed from the polarizer through the liquid crystal plate and the retarder plate, and is reflected by the mirror in a second direction opposite to the first direction back through the retarder and the liquid crystal plate so as to provide a reflected polarized light plane to the polarizer.

Abstract: This invention is a method of manufacturing liquid crystal device, wherein a high molecular liquid crystal layer of the device is formed by applying a high moleculer liquid crystal solution to form an active layer on the substrate and evaporating the solvent, and as high molecule liquid crystal, for example, high molecular liquid crystal having a structure formula as following is utilized.