Fabrication method of curved microlens array with focal length varying with spatial distribution

Abstract

The invention relates to a manufacturing method of a curved micro-lens array of which the focal length varies with spatial distribution. A planar micro-lens array PDMS film is prepared on the preparedmother board, then a PDMS film varying along the radial thickness is manufactured, then a layer of PDMS is poured, the planar micro-lens array film is put on the PDMS, and then the rotationally symmetrical and radial thickness varying planar micro-lens array is manufactured after curing; and the planar micro-lens array is fixed on a closed clamp, the curved micro-lens array can be manufactured bychanging the internal and external pressure intensity difference, and all the small lenses are identical in curvature, diameter and spacing angle and different in radial film thickness so as to formthe curved micro-lens array of which the focal length varies with the spatial distribution. The method is simple in structure without complex equipment and low in cost. Compared with the planar micro-lens array, the curved micro-lens array has the characteristic of wide viewing angle possessed by the insect compound eyes, and the light condensing range of the curved micro-lens array can be changedby changing the bending degree of the micro-lens array through the pressure intensity difference.

Description

technical field [0001] The invention relates to a manufacturing technology of an optical instrument, in particular to a manufacturing method of a curved microlens array whose focal length varies with spatial distribution. Background technique [0002] With the continuous development of science and technology, optical imaging systems are widely used in every field, such as applications in guidance systems, applications in remote sensing imaging, applications in infrared night vision devices, applications in medical equipment, etc., so People's requirements for it are also constantly increasing, hoping that it will develop in the direction of smaller volume, lighter weight, and larger field of view. Therefore, bionic compound eyes have become a frontier topic of research. [0003] In nature, biological compound eyes are composed of a group of "small eyes" gathered together, and usually the entire compound eye has a curved structure. The entire field of view can be divided in...

AI Technical Summary

Problems solved by technology

[0005] 1. The curved surface microlens array is produced point by point on the curved surface substrate, and the curved surface microlens array is produced by laser photolithography directly on the spherical surface. This method can produce a relatively perfect curved surface microlens array. However, this method requires a relatively precise and expensive rotatable and movable laser emission source, so the production cost is very high, and it is not suitable for mass production

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