Three-Lens Optical Assembly Aberration Correction Compact Design
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Solution Overview
Problem
Conventional compact photographing optical lens assemblies face challenges in achieving high image quality while maintaining a compact form factor, as they often struggle with aberration correction and length, especially in portable electronic devices.
Innovation Solution
A photographing optical lens assembly comprising three lens elements with specific refractive powers and surface curvatures, including a first lens with positive refractive power, a second lens with negative refractive power and aspheric surfaces, and a third lens with a concave image-side surface, optimized to reduce total track length and correct aberrations, using relations such as 0.40<T12/T23<2.35 and −2.00<R1/R2<0.50 for efficient space use and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a two-lens structure is used to reduce manufacturing costs, then manufacturing cost is reduced, but aberration correction ability is limited and image quality is insufficient
Solution Approach 1:
The lens assembly is segmented into three distinct lens elements with different refractive powers and surface characteristics. The first lens has positive refractive power with a convex object-side surface, the second lens has negative refractive power with concave surfaces, and the third lens has positive refractive power with a convex object-side surface. This segmentation allows each lens to contribute to specific aberration corrections while maintaining overall compactness and manufacturability.
2Manufacturing precision
If too many lens elements are used to improve image quality, then aberration correction is improved, but total track length increases and compactness is lost
Solution Approach 1:
The patent optimizes specific parameters including the distances between lens elements (T12 and T23), the thicknesses of the lenses (CT2 and CT3), and the radius of curvature values (R1-R6) to achieve compactness. By carefully controlling these parameters within specific ranges, the lens assembly achieves high image quality with a reduced total track length, making it suitable for portable electronic devices.
3Length of moving object
If three positive refractive lens elements are used to maintain compact structure, then total track length is reduced, but aberration correction is insufficient and image quality is compromised
Solution Approach 1:
The lens assembly employs asymmetric surface curvatures and refractive power distributions. The first lens has a convex object-side surface with specific radius of curvature R1, the second lens has concave surfaces with radii R3 and R4, and the third lens has a convex object-side surface with radius R5. This asymmetric design enables effective aberration correction while maintaining a compact total track length.
Solution Approach 2:
The lens assembly uses a composite structure combining lenses with different refractive powers and surface characteristics. The first, second, and third lenses have different refractive indices and surface curvatures, creating a composite optical system that corrects various aberrations. This composite approach allows the system to achieve both compactness and high image quality.
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 total track length, attenuates optical system sensitivity, and enhances resolution, providing improved image quality and compactness suitable for portable electronics by effectively distributing refractive power and correcting aberrations.
Implementation Method 1
a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface
Data Source
AI summary
This invention provides a photographing optical lens assembly comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric; a third lens element having a concave image-side surface, the object-side and image-side surfaces thereof being aspheric, at least one inflection point formed on the image-side surface; wherein there are three lens elements with refractive power. Such an arrangement of lens elements can effectively reduce the total track length of the lens assembly, attenuate the sensitivity of the optical system and obtain higher resolution.