Patent ID: 8433172

Claim:
Device for the optical guidance of a light beam ( 1 . 3 ) transporting an image, comprising: a material forming a guide ( 1 . 5 ) provided with two faces ( 2 . 3 , 2 . 4 ); an injection section ( 1 . 4 ) for entry of the light beam into the guide ( 1 . 5 ), the beam ( 1 . 6 ) propagating in the guide by successive reflections on the two faces ( 2 . 3 , 2 . 4 ) of the guide; an extraction section ( 1 . 7 ) for exiting of the beam; characterised in that the extraction section comprises a plurality of microstructures situated on the surface of one of the two faces ( 3 . 2 ) of the guide ( 1 . 5 ) and each microstructure comprising a flat surface ( 3 . 4 ) causing the exiting from the guide of the light rays ( 3 . 5 ) of the beam striking the said flat surface ( 3 . 4 ) and at least one transparent interstitial zone formed from a flat section parallel to the surface of the guide and disposed between the said microstructures.