Optical element and optical module
AssigneeZhejiang Crystal-Optech Co., Ltd.
InventorsHuan Tao, Weiming Wu, Fenglei Liu
Life of this patent
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Abstract
An optical element (100) and an optical module (200) are provided. The optical element (100) comprises a transparent substrate (110), an array microlens layer (120) and a Fresnel lens layer (130). The array microlens layer (120) and the Fresnel lens layer (130) are stacked on the transparent substrate (110), or the array microlens layer (120) and the Fresnel lens layer (130) are respectively located on two opposite sides of the transparent substrate (110), wherein the Fresnel lens layer (130) is used for adjusting an emergent angle of an incident light beam, and the array microlens layer (120) is used for homogenizing a light beam emitted by the Fresnel lens layer (130).
Claims18
An optical element, comprising a transparent substrate, an array microlens layer, and a Fresnel lens layer, wherein the array microlens layer and the Fresnel lens layer are stacked on a same side of the transparent substrate, wherein a difference between a refractive index n1 of the array microlens layer and a refractive index n2 of the Fresnel lens layer satisfies |n1−n2|≥0.2, wherein a spacer layer is further arranged between the array microlens layer and the Fresnel lens layer, a difference between the refractive index n1 of the array microlens layer and a refractive index n3 of the spacer layer satisfies |n1−n3|≥0.2, and a difference between the refractive index n2 of the Fresnel lens layer and the refractive index n3 of the spacer layer satisfies |n2−n3|≥0.2, such that the Fresnel lens layer adjusts an emergent angle of an incident light beam, and the array microlens layer homogenizes the light beam emerged from the Fresnel lens layer.
Dependencies are inferred from the claim text.