Microlens array

Abstract

The invention relates to an optical lens, in particular to a microlens array. The invention discloses a microlens array which at least comprises two microlens units in contact arrangement. Each microlens unit consists of a front working end face, a back working end face and side faces. The front working end face forms a first-level microlens array; the back working end face forms a second-level microlens array; and all or part of the side faces of each microlens unit are coated by a light-absorbent dielectric layer. As the side faces of each microlens unit are coated with the light-absorbent dielectric layer capable of absorbing the misplaced off-axis stray light in an illuminated zone, the illumination evenness can be greatly improved. In addition, the structure coated with the light-absorbent dielectric layer can also reduce the diffraction effect of the microlens array, and consequently further improve the dodging effect. The light-absorbent dielectric layer also has a heat conducting action, and can evenly conduct out the energy of the absorbed stray light and prevent the device from failure caused by overheating.

Description

technical field [0001] The invention relates to an optical lens, in particular to a microlens array. Background technique [0002] Microlens array, also known as fly-eye lens or fly-eye lens, refers to an integral device composed of multiple small lenses integrated together through a certain mechanism. Often used in lighting systems, microlens arrays can homogenize light. A two-stage microlens array is usually used in combination to enhance the uniform light effect. [0003] see image 3 , is the working principle diagram of the microlens array. The light of the light source, including the on-axis point light source 6 and the small-angle off-axis point light source 7 allowed by the design, enters from the first-stage microlens array 10 composed of the front working end surface 1 of the microlens unit, and converges to the rear working end surface 2 Composition of the second-stage microlens array 11. That is, after the on-axis point light source 6 and the small-angle off-...

AI Technical Summary

Problems solved by technology

But this structure exists as Figure 4 The defect shown: when there is some stray light with a relatively large off-axis light angle in the light source, that is, the large-angle off-axis stray light source 7, the illuminating surface 15 formed by this part of the large-angle off-axis stray light source will be different from the surface to be illuminated Serious misalignment of 13 causes the microlens array mechanism to fail, and the uniformity of the surface 13 to be illuminated will drop sharply

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