Patent ID: 9599831
Date: 2017-03-21
CPC Classifications: G02B,G03B

Claim:
1. A spatial image display apparatus comprising: a first optical plate that transmits an incident light beam such that transmission gain reaches a peak greater than 1 in an optical axis direction of the incident light beam; and a second optical plate in which a plurality of optical elements are provided in a matrix formation, which regularly reflect a Z axis-direction component of a transmissive light beam of the first optical plate and are retroreflective with X and Y axes-direction components of the transmissive light beam, in a substrate having a normal line in a Z axial direction; wherein the first optical plate and the second optical plate are disposed so as not to face each other, and wherein, at a time of operating the spatial image display apparatus, a light source device that has an optical projection system which is able to form an image from projection light is disposed at a position at which a light axis of the projection light obliquely intersects with a normal line of the first optical plate.