Optical Lens Assembly Aberration Correction via Aspheric Curvature
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional photographing modules in mobile devices face challenges in achieving a balance between large optical aperture, high image resolution, and low assembly tolerance, leading to increased manufacturing costs and potential image quality issues such as blurriness or deformation.
Innovation Solution
An optical lens assembly comprising five lenses with specific refractive powers and aspheric surfaces, where the lenses are arranged to satisfy conditions such as −79.81<HFOV*R9/f<−38.47, 34.79<FOV/Fno<58.02, and 28.83<FOV/EPD<49.92, to optimize the balance between focal length and light collection, thereby improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional photographing modules use large optical aperture, then light collection capability is improved, but manufacturing and assembly difficulty increases and cost increases
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length (f=1.93mm) and the specific ratio condition (28.83<FOV/EPD<49.92) to achieve large optical aperture with reduced manufacturing difficulty. The aspheric surface parameters of all five lenses are specifically designed to meet these parameter requirements, enabling mass production while maintaining large aperture capability
2Measurement precision
If assembly tolerance is reduced to improve image resolution, then image resolution is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs aspheric surfaces for all five lenses instead of traditional spherical surfaces. This curvature design enables the system to achieve high image resolution with relaxed assembly tolerance, as the aspheric profiles better correct optical aberrations and reduce sensitivity to alignment errors, thereby lowering manufacturing costs
3Manufacturing precision
If peripheral image quality is sacrificed to reduce assembly tolerance, then assembly tolerance is reduced, but peripheral image quality becomes blurred or deformed
Solution Approach 1:
The patent applies local quality by designing specific aspheric surface profiles for different regions of each lens. The aspheric coefficients are optimized to provide different correction characteristics for central and peripheral rays, ensuring that peripheral image quality remains sharp and undistorted even with reduced assembly tolerance requirements
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 solution effectively enhances image quality by adjusting the balance between focal length and light collection, maintaining high image resolution while reducing assembly tolerance and manufacturing costs.
Implementation Method 1
a first lens with positive refractive power, comprising an object-side surface and an image-side surface, the object-side surface of the first lens being convex near an optical axis and the image-side surface of the first lens being concave near the optical axis, and the object-side surface and the image-side surface of the first lens being aspheric
Data Source
AI summary
An optical lens assembly includes, in order from the object side to the image side: a stop, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power, wherein half of a maximum view angle (field of view) of the optical lens assembly is HFOV, a radius of curvature of an object-side surface of the fifth lens is R9, a focal length of the optical lens assembly is f, and following condition is satisfied: −79.81<HFOV*R9/f<−38.47.