Compact Imaging Lens Assembly Aberration Correction
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Solution Overview
Problem
Conventional wide-angle imaging lenses are complex and costly due to the need for multiple lens elements to correct aberrations, making it difficult to achieve a compact, low-cost design with a wide field of view.
Innovation Solution
A compact imaging lens assembly with two lens elements, one having negative refractive power and the other positive, along with an aperture stop between the second lens element and the image plane, optimized by specific curvature and focal length relationships to enhance image quality and reduce size while maintaining a wide field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple lens elements (three, four or more than four) are used to correct aberrations, then image quality is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies parameter changes by using aspheric surfaces with specific curvature relationships. The second lens element has an aspheric object-side surface with radius of curvature R3 and an aspheric image-side surface with radius of curvature R4, where |R3/R4| is controlled within 1.5-3.0. This parameter optimization allows effective aberration correction with only two lens elements, eliminating the need for three or more elements while maintaining image quality.
2Adaptability or versatility
If multiple lens elements are used to achieve wide field of view, then field of view is improved, but lens size and manufacturing complexity increase
Solution Approach 1:
The patent achieves wide field of view through optimized parameter relationships rather than increasing element count. The key parameters include: the ratio |R3/R4| between 1.5-3.0, the ratio R1/R2 greater than 2.5, and the focal length ratio f/f2 between 0.6-1.0. These parameter optimizations enable effective aberration correction across a wide field of view using only two lens elements.
Solution Approach 2:
The patent employs aspheric surfaces instead of spherical surfaces to correct aberrations. The second lens element features aspheric surfaces with specific curvature radii relationships, which provide better aberration correction performance than spherical surfaces, enabling wide field of view achievement with minimal elements.
3Adaptability or versatility
If conventional wide-angle lens structure (inverse telephoto with negative front group and positive rear group) is used, then wide field of view is achieved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent maintains the inverse telephoto structure with negative first lens element and positive second lens element, but optimizes the parameters to reduce manufacturing complexity. The specific parameter ranges (|R3/R4|=1.5-3.0, R1/R2>2.5, f/f2=0.6-1.0) enable effective aberration correction while allowing for simpler manufacturing processes and lower costs compared to conventional multi-element 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 solution effectively improves image quality, reduces the total track length, and achieves a wide field of view while keeping the lens assembly compact and cost-effective by balancing refractive power and correcting aberrations.
Implementation Method 1
a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface
Implementation Method 2
a second lens element with positive refractive power, at least one of the object-side and image-side surfaces thereof being aspheric
Data Source
AI summary
This invention provides a compact imaging lens assembly comprising, in order from an object side to an image side: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens element with positive refractive power, at least one of the object-side and image-side surfaces thereof being aspheric; and an aperture stop disposed between the second lens element and an image plane; wherein there are two lens elements with refractive power in the compact imaging lens assembly; and wherein the compact imaging lens assembly satisfies the relations: 0.40<f/f2<1.20, |R3/R4|>1.5. Such an arrangement of optical elements can effectively improve the image quality of the system, reduce the total track length of the lens assembly while maintaining a sufficient back focal length, and achieve a wide field of view.