Five-Element Optical Lens Aberration Control
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Solution Overview
Problem
Conventional imaging lenses for mobile devices face challenges in achieving high image quality, resolution, and low distortion while maintaining low sensitivity to assembly, which increases production costs and can result in peripheral image vagueness or deformation.
Innovation Solution
An optical imaging lens design comprising five lens elements with specific refractive powers and aspheric surfaces, including a plastic material composition, where the refractive power of the first and second lens elements is distributed evenly to balance aberrations and reduce assembly sensitivity, and the use of inflection points on the fifth lens element's image-side surface to enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to five or more, then image quality is improved, but manufacturing sensitivity increases and production cost increases
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers of individual lens elements (f1, f2, f3, f4, f5) and their relationships (|f3|≤|fn|), along with specific curvature radius ratios (R2/f, (R1+R2)/(R1−R2)), to achieve high image quality while reducing manufacturing sensitivity. The aspheric surface parameters are also optimized to balance aberration correction with ease of manufacturing.
2Manufacturing precision
If assembly tolerance is reduced to improve image quality, then manufacturing precision increases, but peripheral image quality deteriorates
Solution Approach 1:
The patent applies local quality by using aspheric surfaces on specific lens elements (particularly the first, second, and fifth elements) to locally correct aberrations in different field regions. The aspheric coefficients are optimized to provide different correction characteristics for central and peripheral rays, maintaining high image quality across the entire field without requiring extremely tight assembly tolerances.
3Device complexity
If refractive power is concentrated in fewer lens elements, then device complexity is reduced, but aberration balance deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the total refractive power into five distinct lens elements with specific focal lengths (f1, f2, f3, f4, f5) that satisfy |f3|≤|fn|. Each element contributes differently to aberration correction: the first element provides positive power with aspheric surfaces, the second provides negative power, the third provides positive power, the fourth provides negative power, and the fifth provides positive power with an inflection point. This segmented distribution achieves superior aberration balance compared to concentrating power in fewer 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
The design achieves high image quality, low distortion, and reduced sensitivity to assembly, thereby improving image resolution and maintaining a wide field of view while minimizing production costs and assembly complexity.
Implementation Method 1
a first lens element with a refractive power having an aspheric object-side surface and an aspheric image-side surface
Data Source
AI summary
An optical imaging lens includes an aperture stop and an optical assembly, the optical assembly includes, in order from the object side to the image side: a first lens element with a refractive power; a second lens element with a negative refractive power; a third lens element with a positive refractive power; a fourth lens element with a negative refractive power; a fifth lens element with a refractive power; wherein a focal length of the optical imaging lens is f, focal lengths of the first, second, third, fourth and fifth lens elements are f1, f2, f3, f4, f5, respectively, a radius of curvature of an image-side surface of the first lens element is R2, satisfying: |f3|≦|fn|, wherein n=1, 2, 4 and 5; −1<R2/f<0.