СПОСОБ ИЗГОТОВЛЕНИЯ СПЕКЛ-ДИФФУЗОРА

摘要

A method for manufacturing a speckle-diffuser ensuring the constant value of the indicatrix of scattering over the total area of the speckle-diffuser in case of large sizes of the speckle-diffuser. The method comprises the consecutive exposing of regions of a light-sensitive medium by a speckle pattern and the subsequent developing of the light-sensitive medium. The method is characterized in that the exposed areas of the light-sensitive medium consist of a central zone (1) and peripheral zones (2) surrounding it, and in that they are overlapped by their peripheral zones (2), the exposure in the central zone (1) being equal to a prescribed value, while the exposure in the peripheral zone (2) decreases linearly from the said value at its boundary with the central zone (1) to the zero value at the boundary of the exposed area. The shape, sizes and mutual location of the exposed areas are chosen so as to provide uniform resulting exposure equal to the prescribed value over the total area of the light-sensitive medium after the termination of the exposing process.