Patent ID: 9285590
Filing Date: 2016-03-15
CPC Classification: G02B

Claim Text:
1. An optical guidance device for optical guidance of a light beam transporting an image, said optical guidance device comprising: a first part, made from a transparent material, comprising an extraction section comprising at least one microstructure, situated on a surface of said first part; and a second part, made from a material substantially identical to that of said first part, comprising a section, comprising on a surface thereof at least one microstructure with a form complementary to that or those of said extraction section; wherein the optical guidance device is such that said first part propagates the light beam by successive total internal reflections inside said first part, and wherein each said at least one microstructure comprises a flat surface enabling rays of the light beam propagated by successive reflections in said first part and striking said flat surface to emerge from the optical guidance device; and wherein said optical guidance device further comprises a layer of adhesive extending over a part of the surfaces of said first and second parts assembling them so that every microstructure of said extraction section is separated from its complementary microstructure by a transparent medium of substantially constant thickness.