Abstract: An optical device includes 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. A polarizing material is present between the optical guide and the injection device at the injection section. The injection device includes a prism and an assembly formed by a quarter-wave plate and curved mirror, the injection device being arranged so that a light beam reflected by the polarizing 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 polarizing material and passes through the quarter-wave plate again.

Abstract: An optical guide comprises an injection zone intended to inject into the optical guide a light signal and an extraction zone intended to provide the light signal after transport by the optical guide. The optical guide comprises, in a superposed manner, at least two guidance elements. In a zone situated between the injection zone and the extraction zone, the guidance elements are partially separated from one another by a semi-reflective coating of length, in the direction or propagation of the light signal in the optical guide, dependent on a minimum angle of incidence of the light signal and on the thickness of at least one of the guidance elements that the semi-reflective coating separates.

Abstract: An optical guidance device for optical guidance of a light beam has a first part, in a transparent material, adapted for propagating the light beam by successive reflections. This first part comprises an extraction section comprising at least one microstructure comprising a plane surface adapted to enable the rays of the light beam striking the plane surface to emerge from the guidance device. The device also comprises a second part, in a material substantially identical to that of the first part, comprising a section comprising at least one microstructure with a shape complementary to that or those of the extraction section. The device also has a layer of adhesive assembling the first and second parts in such a way that any microstructure of the extraction section is separated from its complementary microstructure by a transparent medium of substantially constant thickness.

Abstract: An optical device includes 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. A polarising material is present between the optical guide and the injection device at the injection section. The injection device includes a prism and an assembly formed by a quarter-wave plate and curved mirror, the injection device being arranged so that a light beam reflected by the 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.

Abstract: The invention proposes a short-distance front projection system, that is to say with a wide angle, occupying a small volume and offering a possibility of focusing as well a zoom function. It makes it possible to obtain images with a diagonal greater than 2 meters, the whole of the optical system being at least 50 cm from the plane of the image. This projector is constructed on the basis of three optical elements: an ocular, an afocal lens system and a final group forming an objective intended to form the intermediate image in front of the mirror.

Abstract: An optical guide comprises an injection zone intended to inject into the optical guide a light signal and an extraction zone intended to provide the light signal after transport by the optical guide. The optical guide comprises, in a superposed manner, at least two guidance elements. In a zone situated between the injection zone and the extraction zone, the guidance elements are partially separated from one another by a semi-reflective coating of length, in the direction or propagation of the light signal in the optical guide, dependent on a minimum angle of incidence of the light signal and on the thickness of at least one of the guidance elements that the semi-reflective coating separates.

Abstract: An optical guidance device for optical guidance of a light beam has a first part, in a transparent material, adapted for propagating the light beam by successive reflections. This first part comprises an extraction section comprising at least one microstructure comprising a plane surface adapted to enable the rays of the light beam striking the plane surface to emerge from the guidance device. The device also comprises a second part, in a material substantially identical to that of the first part, comprising a section comprising at least one microstructure with a shape complementary to that or those of the extraction section. The device also has a layer of adhesive assembling the first and second parts in such a way that any microstructure of the extraction section is separated from its complementary microstructure by a transparent medium of substantially constant thickness.

Abstract: The invention proposes a short-distance front projection system, that is to say with a wide angle, occupying a small volume and offering a possibility of focusing as well a zoom function. It makes it possible to obtain images with a diagonal greater than 2 metres, the whole of the optical system being at least 50 cm from the plane of the image. This projector is constructed on the basis of three optical elements: an ocular, an afocal lens system and a final group forming an objective intended to form the intermediate image in front of the mirror.

Abstract: The invention relates to informative eyeglasses (500) comprising: —an optical guide (514) forming an eyeglass lens (500) and exhibiting 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, said axis of revolution constituting the optical axis (102) 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 said optical axis (102) and which is substantially in the focal plane of said catadioptric collimator (150).

Abstract: The invention relates to informative eyeglasses (500) comprising:—an optical guide (514) forming an eyeglass lens (500) and exhibiting 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, said axis of revolution constituting the optical axis (102) 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 said optical axis (102) and which is substantially in the focal plane of said catadioptric collimator (150).