Patent ID: 8310763

Claim:
Informative eyeglasses ( 500 ) comprising: an optical guide ( 514 ) forming an eyeglass lens ( 500 ) and having an injection section ( 504 ) and an extraction section ( 508 ), a catadioptric collimator ( 150 ) comprising: a refractive entrance surface ( 202 ), a first reflecting surface ( 204 ), a second reflecting surface ( 206 ) and a refractive exit surface ( 208 ), each surface ( 202 , 204 , 206 , 208 ) constituting a surface of revolution with the same axis of revolution, the said axis of revolution constituting the optical axis of the collimator ( 150 ), an illumination source ( 104 ) generating an incident light beam ( 108 ) illuminating the refractive entrance surface ( 202 ), and the axis of which is shifted with respect to the said optical axis ( 102 ) and is substantially in the focal plane of the said catadioptric collimator ( 150 ), the surfaces ( 202 , 204 , 206 , 208 ) being such that incident light beam ( 108 ) is successively refracted by the refractive entrance surface ( 202 ), reflected by the first reflecting surface ( 204 ), reflected by the second reflecting surface ( 206 ) and refracted by the refractive exit surface ( 208 ) as an exiting light beam ( 110 ), and such that the exiting light beam ( 110 ) is collimated substantially to infinity parallel to a direction forming a non-zero angle of inclination (θ 0 ) with the said optical axis ( 102 ), the catadioptric collimator ( 150 ) and the illumination source ( 104 ) being such that the exiting light beam ( 110 ) enters the optical guide ( 514 ) through the injection section ( 504 ) and is extracted as a light beam extracted ( 510 ) by the extraction section ( 508 ).