Imaging optical unit for generating a virtual image and smartglasses

An imaging optical unit for generating a virtual image of an initial image represented on an image generator, comprising:

• at least one spectacle lens, including an inner surface that faces an eye of a user and an outer surface that faces away from the eye of the user;
• an input coupler that that is configured to couple an imaging beam path emanating from the initial image into the spectacle lens in between the inner surface and the outer surface of the spectacle lens;
• and
• a Fresnel structure present in the spectacle lens that is configured to couple the imaging beam path out from the spectacle lens towards the eye of the user,
• wherein the input coupler is configured to couple the imaging beam path such that the imaging beam path is guided by reflections between the inner surface and the outer surface to the Fresnel structure,
• wherein the imaging beam path comprises a plurality of rays,
• wherein the Fresnel structure includes Fresnel surfaces configured to provide a base deflection of the plurality of rays of the imaging beam path of 45 to 55 degrees, and
• wherein the input coupler is configured to couple the imaging beam path in between the inner surface and the outer surface of the spectacle lens such that the imaging beam path is guided via at most four reflections to the Fresnel structure, and each of the exactly four reflections takes place at either of the inner surface or the outer surface of the spectacle lens
• wherein an edge thickening region is provided in the at least spectacle lens between the input coupler and the Fresnel structure, in which a thickness of the at least one spectacle lens is greater than a thickness in the region of the Fresnel structure, and
• wherein the input coupler is configured to couple the imaging beam path in between the inner surface and the outer surface of the at least one spectacle lens such that a first reflection occurs after the input coupling at the outer surface of the at least one spectacle lens and a second reflection occurs after the input coupling at a reflection surface arranged on the inner side of the at least one spectacle lens in the edge thickening region.