摘要：

The production of a gradient density polarizing filter by applying a solvent solution of dichroic substance capable of existing in the nematic liquid crystal phase to a directionally oriented light transmissive supporting surface so as to form a coating of solvent solution thereon, the concentration of the dichroic substance in the solvent solution being selectively varied during application of the solvent solution to different areas of the supporting surface, whereupon the solvent is evaporated to bring the dichroic substance into its nematic phase with the direction of orientation of its molecules controlled by the orientation of the supporting surface, the light transmissive properties of the polarizer so formed varying in a smooth gradient in accordance with the concentration of the dichroic substance applied to the supporting surface.

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