Patent ID: 6198555
Filing Date: 2001-03-06
Classification: G02B,G03H

Abstract:
A manufacturing method for Fresnel's holographic screens, comprising:converting a coherent beam into a light flux having an expanded width at a predetermined position to a photosensitive element;irradiating part of the expanded light flux directly on said photosensitive element as a reference beam;diffusing the remainder of said expanded light flux by using a diffusing member and changing an optical direction thereof by using a reflective member, said diffusing member being disposed at a predetermined position outside an optical path of said reference beam, thereby converting the remainder of said expanded light flux not irradiated directly to said photosensitive element into a scattered beam advancing as an object beam toward said photosensitive element; andforming interference fringes on said photosensitive element by using said reference beam and said object beam.