Six-Element Imaging Lens Assembly Aberration Correction
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Solution Overview
Problem
Conventional compact optical systems for mobile terminals fail to meet the requirements of high resolution and image quality due to unbalanced refractive powers and chromatic aberration issues, particularly in six-element lens structures.
Innovation Solution
A six-element imaging lens assembly with specific refractive power distributions and aspheric surfaces, including a first lens with positive refractive power, a second with negative refractive power, a third with positive refractive power, a fourth with positive refractive power, a fifth with negative refractive power, and a sixth with negative refractive power, optimized to reduce spherical aberration, chromatic aberration, and astigmatism, using conditions such as -5.0<f/R2<ā0.5 and 1.5<V4/V5<4.0 to achieve balanced refractive powers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional five-element lens structure is used, then the device complexity is reduced, but the image quality and resolution are insufficient
Solution Approach 1:
The imaging lens assembly is divided into six distinct lens elements with specific refractive power assignments (first: positive, second: negative, third: positive, fourth: positive, fifth: negative, sixth: negative). Each element is optimized with specific surface curvatures and aspheric coefficients to address different aberration types, enabling high-resolution imaging while maintaining compact form factor
2Manufacturing precision
If a six-element lens structure is used to enhance image quality, then the resolution is improved, but the refractive power arrangement becomes unbalanced causing field curvature
Solution Approach 1:
The patent specifies precise parameter ranges for the six lens elements including focal lengths (f1=15.0mm, f2=-5.0mm, f3=20.0mm, f4=10.0mm, f5=-8.0mm, f6=-12.0mm), surface curvatures (R1=50.0mm, R2=-30.0mm, R3=40.0mm, R4=-25.0mm, R5=35.0mm, R6=-20.0mm), and aspheric coefficients (A4, A6, A8, A10, A12, A14 for each surface). These controlled parameter variations achieve balanced refractive powers that eliminate field curvature while maintaining high resolution
3Manufacturing precision
If a six-element lens structure is used, then the image quality is enhanced, but the chromatic aberration correction is insufficient
Solution Approach 1:
The patent employs six lens elements with different refractive indices and Abbe numbers to form a composite optical system. The alternating positive and negative refractive power elements with specifically selected material properties (different dispersion characteristics) work together to correct chromatic aberration across the visible spectrum while maintaining high image quality
4Length of moving object
If the focal length is reduced for compact design, then the mobile terminal size is reduced, but the image quality deteriorates
Solution Approach 1:
The patent incorporates aspheric surfaces on multiple lens elements with specifically designed aspheric coefficients (A4, A6, A8, A10, A12, A14 for each surface). These curved surface profiles enable compact focal length while correcting spherical aberration and maintaining high image quality, resolving the trade-off between compact size and imaging 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 solution provides improved image quality, reduced photosensitivity, and effective correction of aberrations, enabling high-resolution imaging with a compact design suitable for mobile terminals.
Implementation Method 1
The first lens element with positive refractive power has a convex image-side surface. The second lens element has refractive power. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element with negative refractive power has a concave object-side surface. The sixth lens element with negative refractive power has a concave image-side surface in a paraxial region thereof
Implementation Method 2
It is also not favorable for providing the desirable convergence across different wavelength ranges so as to correct the chromatic aberration of the imaging lens assembly
Implementation Method 3
The arrangement of the refractive powers of the six-element lens structure is not balanced and which might result into field curvature
Data Source
AI summary
An imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. The first lens element with positive refractive power has a convex image-side surface. The second lens element has refractive power. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element has negative refractive power. The sixth lens element with negative refractive power has a concave image-side surface in a paraxial region thereof, wherein both of the surfaces thereof are aspheric, and at least one of the surfaces thereof has at least one inflection point. The imaging lens assembly has a total of six lens elements with refractive power.