Five-Element Optical Imaging Lens Aberration Control
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Solution Overview
Problem
Conventional imaging lenses for mobile devices, consisting of three to four lens elements, face challenges in achieving high image quality due to sensitivity issues during manufacturing and assembly, leading to peripheral image quality degradation and increased production costs.
Innovation Solution
A five-piece optical imaging lens design with specific refractive power relationships and aspheric surfaces among its elements, including a stop, first, second, third, fourth, and fifth lens elements, optimized to reduce distortion, spherical aberration, and astigmatism, while facilitating miniaturization and improved manufacturing tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased from three to four to five, then image quality is improved, but manufacturing sensitivity and assembly difficulty increase
Solution Approach 1:
The optical imaging lens is divided into five distinct lens elements with specific refractive power configurations (first positive, second negative, third positive, fourth negative, fifth positive). Each lens element has specifically designed aspheric surfaces with different curvature characteristics, allowing the system to achieve high image quality while managing manufacturing complexity through functional segmentation.
Solution Approach 2:
Different lens elements have locally optimized surface characteristics - the first lens element has a convex object-side surface and concave image-side surface, the second has convex-convex surfaces, the third has concave-concave surfaces, the fourth has convex-convex surfaces, and the fifth has concave-concave surfaces. Each surface is aspheric with specifically tailored curvature profiles to correct local aberrations while maintaining overall system performance.
2Manufacturing precision
If assembly tolerance is reduced to improve peripheral image quality, then image quality is improved, but manufacturing sensitivity increases and production cost increases
Solution Approach 1:
All lens surfaces are designed as aspheric surfaces with specifically optimized curvature profiles. The first lens element has aspheric object-side and image-side surfaces, the second has aspheric surfaces, the third has aspheric surfaces, the fourth has aspheric surfaces, and the fifth has aspheric surfaces. These aspheric designs effectively correct spherical aberration and improve peripheral image quality while maintaining relaxed assembly tolerances compared to traditional spherical lens designs.
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 design achieves high resolution, low distortion, and reduced manufacturing sensitivity, enabling a wide field of view, high pixel density, and compact size, thereby improving image quality and reducing production costs.
Implementation Method 1
a first lens element with a positive refractive power, having an object-side surface being convex near an optical axis and an image-side surface being convex near the optical axis, at least one of the object-side surface and the image-side surface of the first lens element being aspheric
Implementation Method 2
at least one of the object-side surface and the image-side surface being aspheric and provided with at least one inflection point
Data Source
AI summary
An optical imaging lens includes, in order from an object side to an image side: a stop, a first lens element with a positive refractive power, a second lens element with a negative refractive power, a third lens element with a refractive power, a fourth lens element with a positive refractive power, and a fifth lens element with a negative refractive power. A focal length of the second lens element, the third lens element and the fourth lens element combined is f234, a focal length of the fifth lens element is f5, and they satisfy the relation: −1.8<f234/f5<−1.0, so that the optical imaging lens would have an appropriate refractive power, and spherical aberration and astigmatism can also be reduced.