Aspherical Image Lens Design for Compact High-Resolution Imaging
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Solution Overview
Problem
Existing image lenses fail to achieve high resolution and compact size, leading to poor imaging performance due to limitations in meeting the requirements of modern image sensors.
Innovation Solution
The image lens design consists of a specific configuration of lenses with positive and negative refractive powers, an anti-IR filter, and an aperture stop, satisfying certain optical formulas to minimize aberrations and maintain a small depth, while using aspherical surfaces to correct chromatic aberrations and distribute refraction power effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing image lens designs are used, then the lens structure is simple, but the imaging performance is poor due to inability to achieve high resolution and compact size simultaneously
Solution Approach 1:
The image lens is divided into multiple lens elements (first lens element, second lens element, third lens element, fourth lens element) with different refractive powers and aspherical surfaces. Each element is optimized independently to contribute to overall imaging performance, allowing high resolution and compact size to be achieved simultaneously through coordinated design of segmented components
Solution Approach 2:
The patent employs aspherical surfaces on multiple lens elements instead of traditional spherical surfaces. The aspherical shapes allow for better correction of optical aberrations and enable compact lens design while maintaining high imaging resolution, directly addressing the contradiction between compact size and imaging performance
2Length of stationary object
If lens depth is reduced to match smaller image sensors, then compact size is achieved, but resolution deteriorates due to increased aberrations
Solution Approach 1:
The patent changes key optical parameters including refractive indices (n1=1.5456, n2=1.6424, n3=1.5356), Abbe numbers (v1=56.1, v2=23.9, v3=56.0), and aspherical surface coefficients (k1=-0.95, k2=-11.49, k3=-6.11, k4=-6.99) to optimize the lens design. These parameter changes enable compact lens depth while maintaining high resolution by correcting aberrations through precisely controlled optical properties
Solution Approach 2:
The patent uses lens materials with different refractive indices and Abbe numbers (combining materials with n=1.5456/v=56.1, n=1.6424/v=23.9, n=1.5356/v=56.0) to create a composite lens system. This material composition allows for effective aberration correction in a compact design, maintaining resolution while reducing lens depth
3Manufacturing precision
If chromatic aberrations are corrected using traditional methods, then color accuracy improves, but lens depth increases reducing compactness
Solution Approach 1:
The patent applies different material properties and aspherical surface designs to specific lens elements based on their local optical functions. The second lens element with negative refractive power and specific aspherical coefficients is positioned to locally correct chromatic aberrations, achieving color accuracy without increasing overall lens depth
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 results in improved imaging performance with reduced chromatic aberrations and field curvature, maintaining high resolution and compact size, ensuring effective image capture across various modes.
Implementation Method 1
a first lens L1 with positive refraction power, a second lens L2 with negative refraction power, a third lens L3 with positive refraction power, and a fourth lens L4 with negative refraction power
Data Source
AI summary
An image lens, in order from an object side to an image side thereof, includes a first lens including a first surface and a second surface, a second lens including a third surface and a fourth surface, a third lens including a fifth surface and a sixth surface, a fourth lens including a seventh surface and a eighth surface, and an image plane. The image lens satisfies the following formulas: D/TTL>1.11; D/L>1.13; Z/Y>0.076; wherein D is the maximum image diameter of the image plane; TTL is a total length of the image lens; L is a distance from an outermost edge of the eighth surface to an optical axis of the image lens; Z is a distance from a central point of the sixth surface to an outermost edge of the sixth surface; and Y is a distance from the outermost edge of the sixth surface to the optical axis.