Light collecting optical device forming a multiple focal distance lens

A multiple focal distance light collecting optical device comprising, a monoblock structure formed of at least a first and a second transparent material shaped into lenses which are applied against and attached to each other, the refractive indices and radii of curvature of the faces of such lenses being determined to focus the light rays so as to create an image in accordance with at least two different focal distances which form between them a non-zero degree angle, each focal distance being determined by a triplet of three lenses which are applied against and attached to each other, so that the chromatic aberrations of said lenses tend to compensate for each other.

A multiple focal distance light collecting optical device comprising, a monoblock structure formed of at least a first and a second transparent material differing by their respective first and second refractive indices, said first and second transparent materials each comprised within a first and second group of lenses, each of said first and second group of lenses comprising at least a first and a second lens applied against and attached to each other, the respective first and second refractive indices and radii of curvature of the faces of said respective first and second lenses of each of the first and second groups of lenses being determined to focus the light rays so as to create an image in accordance with at least a respective first and second focal distance which differ from each other and form between them a non-zero degree angle, wherein said optical device is pivoted to align the desired first or second focal distance with a single axis of light propagation, such that the light passes through at least said first and second transparent materials.