Patent ID: 9696479
Date: 2017-07-04
CPC Classifications: G02B,Y10T

Claim:
1. An optical device comprising an optical guide adapted for propagating a light beam by successive total internal reflections and an injection device adapted for injecting the light beam into the optical guide via an injection section of said optical guide, said injection section being present on one face of said optical guide, the injection device comprising a prism and an assembly formed by a quarter-wave plate and a curved mirror, the injection device being arranged so that a light beam reflected in the prism by a polarising material in the direction of the curved mirror passes through the quarter-wave plate and is then reflected by the curved mirror in the direction of the polarising material and passes through the quarter-wave plate again, wherein the polarising material is present between the optical guide and the prism of the injection device at the injection section such that the polarising material is present onto said injection section of said optical guide and onto one face of the prism of the injection device.