Integrated Fresnel and Microlens Optical Element for Beam Homogenization
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Solution Overview
Problem
Existing optical systems face challenges in adjusting the divergence angle and intensity distribution of light beams, often resulting in diffraction fringes and requiring multiple optical elements, which increases space occupation and hinders miniaturization.
Innovation Solution
An optical element comprising a transparent substrate with a stacked or oppositely located array microlens layer and Fresnel lens layer, where the Fresnel lens layer adjusts the emergent angle and the array microlens layer homogenizes the light beam, reducing coherence effects and space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a microlens array is used to shape the light beam, then the light intensity distribution can be adjusted, but diffraction fringes appear due to interference and diffraction of lens cells
Solution Approach 1:
The patent combines a microlens array and a Fresnel lens into a single integrated optical element. The microlens array shapes the light intensity distribution while the Fresnel lens controls the divergence angle, merging two functions into one component to avoid diffraction fringes from multiple separate elements
Solution Approach 2:
The optical element uses composite structure combining microlens array technology and Fresnel lens technology in one component, with different regions having different optical functions - the microlens array portion for intensity distribution and the Fresnel lens portion for beam divergence control
2Illumination intensity
If multiple groups of optical elements are used to adjust and shape the light beam, then the light beam adjustment and shaping effects are improved, but the occupied space increases
Solution Approach 1:
The patent integrates multiple optical functions (beam shaping, intensity distribution control, and divergence angle adjustment) into a single optical element by combining microlens array and Fresnel lens structures, eliminating the need for multiple separate optical groups and reducing occupied space
Solution Approach 2:
The optical element performs multiple functions simultaneously: the microlens array shapes the beam and controls intensity distribution, while the Fresnel lens adjusts the divergence angle, making a single component serve multiple optical purposes that previously required separate elements
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows flexible adjustment of light beam direction and intensity distribution, improving beam quality and reducing space occupation, facilitating the miniaturization of optical modules.
Implementation Method 1
the Fresnel lens layer is configured for adjusting an emergent angle of an incident light beam
Implementation Method 2
the array microlens layer is configured for homogenizing the light beam emerged from the Fresnel lens layer
Data Source
AI summary
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).