Brief description of the restoration of the ability to the transmission of application coherent of a transparent medium and the optical structure comprising such a medium

摘要

A method of restoring the coherent light transmitting property of a first plate-like transparent medium which has a specific refractive index and an irregular surface that produces light scattering image distortion is described which comprises the steps of applying a clear hardenable plastics material to the said irregular surface, the plastics material having a refractive index substantially equal to the refractive index of the transparent medium and then applying a surface of a second transparent medium directly to the plastics material in adhering relationship thereto, one of the opposing surfaces of the second transparent medium being smooth and becoming the outside surface of a laminate formed by the first transparent medium, the plastics material and the second transparent medium. In addition an optical structure (2) is provided comprising a first light transmitting plate member (6) having a smooth exterior surface (26) and an opposing inner surface (12) sculpted with forms or figures topographically contouring the inner surface (12); a second light transmitting plate member (8) secured to the inner surface (12) of the first plate member (6) forming a laminate; and a light reflective medium (10) carried by one of the plate members (6,8). The optical system (2) described transmits coherent light through the entire body of the system and reflects light from the contoured coating to create an image of the bas relief object to an observer.