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1. (WO2018166921) OPTICAL DEVICE FOR A HEAD-MOUNTED DISPLAY, AND HEAD-MOUNTED DEVICE INCORPORATING IT FOR AUGMENTED REALITY

Pub. No.:    WO/2018/166921    International Application No.:    PCT/EP2018/055949
Publication Date: Fri Sep 21 01:59:59 CEST 2018 International Filing Date: Sat Mar 10 00:59:59 CET 2018
IPC: G02B 27/01
G02C 7/08
Applicants: ESSILOR INTERNATIONAL
Inventors: MEYNEN, Mathieu
PELOUX, Marius
HUBACZ, Dominick
JOUARD, Ludovic
REIGNAULT, Marc
Title: OPTICAL DEVICE FOR A HEAD-MOUNTED DISPLAY, AND HEAD-MOUNTED DEVICE INCORPORATING IT FOR AUGMENTED REALITY
Abstract:
The present invention relates to an optical device usable in a head-mounted display which comprises a light conducting element and at least one wafer, and to a head- mounted device which is configured to provide an informative display of augmented reality for a wearer of the head-mounted device and which comprises such an optical device. This optical device (1) comprises: a light conducting element (4) which has two first and second opposite main faces (4a and 4b) and which inputs and conducts by total internal reflections a light (6) received from the light source (5) and partially outputs it out of said element, at least one wafer (2, 3) which comprises an internal surface (2a, 3a) facing a said first main face of said light conducting element, and interposition means in contact with said first main face and said internal surface and defining a gap (11a, 11b) optically isolating said element. According to the invention, said interposition means comprise a peripheral sealing arrangement (10a, 10b) which extends along its peripheral length between and in sealing contact with a peripheral area (2aa, 3aa) of said internal surface and a facing zone (4aa, 4ba) of said first main face, at least one portion of said sealing arrangement exhibiting a locally reduced optical coupling with said first main face to preserve said internal reflections at said at least one portion toward the inside of said element.