Patent ID: 8724224
Filing Date: 2014-05-13
Classification: G02B

Abstract:
1. A display device comprising: a dihedral corner reflector array optical element comprising: a substrate, and a plurality of protrudent bodies arranged regularly on and each protruding from a base plane at a first main surface side of the substrate, wherein the protrudent bodies and the substrate are integrally formed of a transparent material, and wherein each of the protrudent bodies includes two sides of orthogonal mirror planes which are perpendicular to each other to constitute a dihedral corner reflector perpendicular to the first main surface side of the substrate; an observed object which exists by the one surface side of the substrate so that the protrudent bodies face toward a space in which the observed object exists, wherein the dihedral corner reflector array optical element forms a real image of the object by a second main surface side of the substrate; and a lighting device for irradiating light to a side of the dihedral corner reflector array optical element opposite to the space in which the observed object exists with respect to the dihedral corner reflector array optical element, the lighting device being positioned so as to weaken an intensity of light rays from the lighting device passing through the real image of the object with a positional relation of a regular reflection with respect to the dihedral corner reflector array optical element.