Large-depth-of-field flat lens for air imaging and air imaging system

Abstract

The invention discloses a large-depth-of-field flat lens for air imaging. The large-depth-of-field flat lens comprises an optical waveguide array structure, wherein the optical waveguide array structure comprises dihedral angle reflectors arranged in a plurality of rows and a plurality of columns, and the heights of the dihedral angle reflectors are reduced from the center to the edge of the optical waveguide array structure in the column direction. The invention further discloses an air imaging system. The air imaging system comprises a light source and a flat lens, wherein the flat lens is any one of the large-depth-of-field flat lenses for air imaging. The large-depth-of-field flat lens has the advantages that the heights of the dihedral angle reflectors are reduced from the middle to the edge in the column direction, a slit optical waveguide structure is formed, light is subjected to optical imaging through a slit, the spherical aberration is smaller, the imaging depth of field islarger, the imaging definition is effectively improved, the highest height of the dihedral angle reflector can be consistent with that of an original dihedral angle reflector, and accordingly, the large-depth-of-field flat lens can be directly replaced with an original air imaging device for use without changing the size of an existing flat lens.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a flat plate lens with a large depth of field for air imaging and an air imaging system. Background technique [0002] Flat-plate lenses for air imaging generally use long strip reflectors or dihedral reflectors. The scheme of using dihedral reflectors uses dihedrals of equal size that are periodically imprinted between two transparent substrates and arranged obliquely at 45°. Corner rectangular reflectors or elongated reflectors for air imaging by secondary reflection. [0003] Due to the use of dihedral rectangular reflectors of equal size and optical waveguides of equal size, the farther away from the light source, the larger the earth’s aberration and the smaller the depth of field, thereby reducing the definition of imaging. In the optical mirror group, convex lenses are commonly used The combination of the convex lens and the concave lens can reduce the spherical aberrati...

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Problems solved by technology

[0003] Because of the use of dihedral rectangular reflectors of equal size and optical waveguides of equal size, the farther away from the light source, the larger the earth aberration and the smaller the depth of field. In order to reduce the clarity of imaging, in the optical lens group, the combination of convex lens and concave lens is often used to reduce spherical aberration, but the combination of convex lens and concave lens in the air imaging device will seriously affect the viewing angle of the picture

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