Patent ID: 9122052
Filing Date: 2015-09-01
Classification: G02B

Abstract:
1. A head-up display, comprising an image source and a mirror positioned along parallel main planes and separated by a first distance (d), the mirror being shaped to form virtual images of the images provided by the image source at a second distance (D) from the mirror, greater than the first distance, the mirror being formed of a stack of two layers of same index separated by a broken line having inclined portions coated with a semi-reflective film, wherein the mirror comprises elementary portions, angle μ of each elementary portion with respect to the main plane of the mirror, according to distance h between the projection of the center of said portion on the plane of the image source and the center of the image source, being defined by the following equation: θ being defined by θ=arctan(h/d), G being the ratio between the second (D) and the first distance (d), f(G) being a negative value, and a being a constant parameter.