Single Focus Lens Compactness Aberration Correction
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Solution Overview
Problem
Current image pick-up lenses for small-sized devices like mobile phones and digital cameras require further compactness and high performance to accommodate increasing pixel density and resolution, while existing three-lens constructions fall short in achieving these goals.
Innovation Solution
A single focus lens system comprising a first positive power lens, a second negative meniscus lens, and a third aspheric lens, optimized with specific refractive indices, Abbe numbers, and curvature radii, along with an aperture stop placement to satisfy conditional expressions, allowing for a compact and high-performance lens system with only three lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of lenses is reduced to three lenses for compactness, then the lens size is reduced, but the image quality and aberration correction performance deteriorate
Solution Approach 1:
The patent applies parameter changes by specifying precise refractive index ranges (NdA: 1.60-1.75, νdA: 25-40, NdB: 1.50-1.60, νdB: 30-50) and curvature radius relationships for each lens element. These parameter optimizations enable the three-lens system to achieve both compactness and high image quality by carefully controlling optical properties to correct aberrations effectively
Solution Approach 2:
The patent uses composite material principles by combining lenses with different refractive index characteristics and dispersion properties. The first lens group uses materials with specific Nd and νd combinations, while the second lens group uses different material parameters, creating a composite optical system that corrects chromatic and spherical aberrations despite the reduced lens count
2Manufacturing precision
If high resolution performance is achieved with more lenses, then image quality improves, but the lens system becomes larger and more complex
Solution Approach 1:
The patent applies local quality by giving each lens element specific functional characteristics: the first lens has a convex object-side surface for light convergence, the second lens has a concave object-side surface for divergence and aberration correction, and the third lens is aspheric for precise focal control. Each element's local optical properties are optimized to contribute to overall high resolution performance
Solution Approach 2:
The patent employs spheroidality principles by using aspheric surfaces on the third lens and specifying curvature radius relationships (R1, R2, R3, R4) for each lens element. The aspheric design and controlled curvatures enable precise aberration correction and high resolution imaging without requiring additional lens elements
3Volume of moving object
If the focal length ratio f1/f is optimized for compactness, then the lens system becomes smaller, but the aberration correction capability is compromised
Solution Approach 1:
The patent optimizes the focal length ratio parameter f1/f within specific ranges to achieve compactness while maintaining aberration correction. By controlling this parameter alongside refractive indices and curvature radii, the system achieves a balance between size and optical performance
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 optimized lens system achieves compactness and high performance by effectively correcting aberrations and ensuring sufficient image quality, using vitreous materials with appropriate refractive indices and dispersion characteristics, while maintaining a minimal number of lenses.
Implementation Method 1
a first lens of positive power having a convex-shaped surface on an object side
Implementation Method 2
a second lens of a negative meniscus lens having, on the object side, a concave-shaped surface on its paraxial axis
Implementation Method 3
a third lens of an aspheric lens having, on the object side, a convex-shaped surface on its paraxial axis
Data Source
AI summary
A single focus lens comprises: a first lens of positive power having a convex-shaped surface on an object side; a second lens of a negative meniscus lens having, on the object side, a concave-shaped surface on its paraxial axis; and a third lens of an aspheric lens having, on the object side, a convex-shaped surface on its paraxial axis, in this order from the object side, wherein the single focus lens satisfies the predetermined conditions.