Patent ID: 8941800
Filing Date: 2015-01-27
Classification: G02B

Abstract:
1. An optical system, comprising: a reflective imaging element; and a display panel, wherein the reflective imaging element, comprises: a plate-like substrate; a plurality of holes penetrating through the plate-like substrate along a thickness direction thereof; two orthogonally-disposed specular elements on inner walls of the plurality of holes; a first principal face on which light from the display panel is received; and a second principal face parallel to the first principal face, wherein, the first principal face has a plurality of first light-transmitting portions, and the second principal face has a plurality of second light-transmitting portions, an area of each of the plurality of first light-transmitting portions being larger than an area of each of the plurality of second light-transmitting portions; each of the plurality of first light-transmitting portions is connected to a respective one of the plurality of second light-transmitting portions via a corresponding hole among the plurality of holes; two taper elements opposing the two specular elements are comprised; the two taper elements each have a first side which is parallel to the first principal face, a second side which is orthogonal to the first principal face and to the first side, and a hypotenuse which meets the first and second sides and constitutes an angle β with the second side; and an angle constituted by a normal direction of the first principal face and an incident direction of light striking the first principal face defines an incident angle θ, such that, in a range of 0°<θ<90°, the angle β satisfies (90°−θ)/4≦β, and the light is reflected at least two times at the two taper elements.