Two-Element Miniaturized Optical Lens System Aberration Correction
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Solution Overview
Problem
Conventional miniaturized optical lens systems face challenges in reducing total track length and achieving high image quality due to limited space and poor aberration correction, especially when reducing the number of lens elements from three to two, which affects chromatic and astigmatism corrections.
Innovation Solution
A miniaturized optical lens system comprising two lens elements with specific refractive powers and surface curvatures, including aspheric surfaces, where the first lens element has positive refractive power with a convex object-side and concave image-side surface, and the second lens element has negative refractive power with a concave object-side and convex image-side surface, along with an aperture stop placement that satisfies certain optical parameters to correct aberrations and reduce system volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of lens elements is reduced from three to two to minimize total track length, then the volume of the optical lens system is reduced, but the ability to correct aberrations and astigmatism deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully selecting specific refractive indices (N1, N2) and Abbe numbers (V1, V2) for the two lens elements, along with precise curvature radii (R1-R6) and thickness ratios (CT1/CT2). These parameter optimizations enable the two-element system to achieve aberration correction performance comparable to traditional three-element systems while maintaining minimal total track length.
Solution Approach 2:
The patent employs composite material principles by selecting lens materials with specific optical properties - the first lens element uses material with refractive index N1 and Abbe number V1, while the second lens element uses material with refractive index N2 and Abbe number V2. This strategic material selection allows the two-element composite system to correct chromatic aberrations and other optical imperfections effectively.
2Volume of moving object
If lens elements are made thinner to reduce total track length, then the system volume is reduced, but the homogeneity of plastic material deteriorates due to injection molding process limitations
Solution Approach 1:
The patent addresses material homogeneity by optimizing the center thickness ratio (CT1/CT2) between the two lens elements. By maintaining appropriate thickness proportions rather than making both elements uniformly thin, the injection molding process can produce lenses with homogeneous material distribution while still achieving compact overall dimensions and minimal total track length.
3Volume of moving object
If a biconcave second lens element is used in a two-element system, then the total track length is reduced, but the correction of aberrations and astigmatism becomes less effective compared to a meniscus lens element
Solution Approach 1:
The patent resolves this contradiction by optimizing the curvature radii parameters (R3 and R4) of the second lens element. The specific ratio and magnitude of these curvature radii are carefully selected to enable the biconcave lens to achieve aberration and astigmatism correction performance comparable to or exceeding that of traditional meniscus lens designs, while maintaining the compact form factor.
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
This configuration effectively reduces the volume of the optical lens system, corrects aberrations and astigmatism, and achieves high resolution, while maintaining a compact design suitable for portable electronics.
Implementation Method 1
a first lens element with positive refractive power having a convex object-side surface and a concave image-side surface
Implementation Method 2
a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface
Data Source
AI summary
A miniaturized optical lens system comprises, in order from the object side to the image side: a first lens element with positive refractive power having a convex object-side surface, a concave image-side surface and one of the surfaces being aspheric; and a second lens element with negative refractive power having a concave object-side surface, a convex image-side surface and one of the surfaces being aspheric. The optical lens system is further provided with an aperture stop. Such arrangements can effectively reduce the volume of the optical lens system, correct aberrations and astigmatism of the system in order to obtain higher image quality.