Micro-lens Module with Aspheric Surfaces and Aperture Stop
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Solution Overview
Problem
The challenge is to design a micro-lens module that achieves high image quality, low fabrication costs, and a small volume, particularly for portable electronic devices where lens sizes need to be minimized to accommodate smaller image sensing devices.
Innovation Solution
A micro-lens module comprising a first plano-convex lens with an aspheric surface facing the object side, a second plano-convex lens with an aspheric surface facing the image side, and an aperture stop, where specific curvature ratios and refractive indices are maintained to optimize image formation, along with an optical detector and light transmissive device, ensuring high image quality and low fabrication costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens size is reduced to accommodate smaller image sensing devices, then the portability and compactness are improved, but the image quality deteriorates
Solution Approach 1:
The lens system is divided into multiple lens elements (first lens, second lens, and optionally third and fourth lenses) with specific configurations. Each lens element contributes to the overall optical performance, allowing the system to maintain high image quality while keeping the total volume small. The segmentation of the optical system into discrete elements enables precise control of light paths and aberrations in a compact form factor.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, including the object-side surface of the first lens, the image-side surface of the second lens, and potentially other surfaces. These aspheric surfaces with specifically designed curvatures enable effective aberration correction and focus control within a reduced lens volume, maintaining high image quality despite the compact size.
2Manufacturing precision
If complex lens structures are used to improve image quality, then the imaging performance is improved, but the fabrication cost increases
Solution Approach 1:
The patent specifies particular parameter ranges for the lens system, including curvature radii ratios (0.15 < R2/R1 < 0.35), refractive indices (1.5 < nd1 < 1.7, 1.5 < nd2 < 1.7), and Abbe numbers (20 < vd1 < 40, 20 < vd2 < 40). By optimizing these parameters within defined ranges, the design achieves high image quality while maintaining manufacturability and controlling fabrication costs through standardized material selections and geometric constraints.
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
The module achieves high image quality with minimized volume and low fabrication costs, as demonstrated by optical imaging simulation data within standard ranges, effectively addressing the need for compact and cost-effective lens solutions in portable devices.
Implementation Method 1
The first surface of the first lens facing the object side is an aspheric surface, and the curvature radius of the aspheric surface is R1. The second surface of the second lens facing the image side is an aspheric surface, and the curvature radius of the aspheric surface is R2.
Implementation Method 2
The aperture stop is disposed between the first lens and the second lens, wherein the distance from the first surface to the aperture stop is d1, and the distance from the second surface to the aperture stop is d2.
Data Source
AI summary
A micro-lens module including a first lens, a second lens, and an aperture stop is provided. The first lens is disposed between an object side and an image side, wherein a first surface of the first lens facing the object side is an aspheric surface, and the curvature radius of the aspheric surface is R1. The second lens is disposed between the first lens and the image side, wherein a second surface of the second lens facing the image side is an aspheric surface, and the curvature radius of the aspheric surface is R2. The aperture stop is disposed between the first lens and the second lens, wherein the distance from the first surface to the aperture stop is d1, and the distance from the second surface to the aperture stop is d2. The micro-lens module satisfies 6>d2/d1>2.5 and −2.5<R1/R2<1.5.