Six-Element Aspheric Lens Assembly for Aberration Correction
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Solution Overview
Problem
Conventional compact optical systems for portable electronic devices, such as smartphones and tablets, fail to meet the requirements for high resolution and image quality due to inadequate correction of astigmatism and spherical aberration, especially in the off-axis region, and require a more efficient design to enhance image quality.
Innovation Solution
An optical imaging lens assembly comprising six lens elements with specific refractive powers and surface shapes, including aspheric surfaces and inflection points, is designed to correct astigmatism and spherical aberration, with conditions such as curvature radii and axial distances optimized to improve image quality and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional four-element or five-element lens structures are used, then the device complexity is reduced, but the image quality and resolution are insufficient
Solution Approach 1:
The six-element lens structure integrates multiple correction functions into a unified system. Each lens element contributes to correcting different types of aberrations (spherical, coma, astigmatism, field curvature), allowing the system to achieve high image quality that would require multiple separate correction mechanisms in conventional designs.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements (first, second, fourth, and sixth elements) with specifically optimized curvature radii and conic coefficients. This parameter optimization enables effective aberration correction while maintaining a compact form factor, resolving the contradiction between image quality and device complexity.
2Manufacturing precision
If the surface shape of the second lens element is conventional, then the manufacturing is simpler, but the correction of astigmatism and spherical aberration is insufficient
Solution Approach 1:
The second lens element employs an aspheric surface with optimized curvature radius and conic coefficient, enabling effective correction of astigmatism and spherical aberration in both paraxial and off-axis regions. This curved surface design replaces conventional spherical surfaces to achieve superior optical performance.
3Manufacturing precision
If the surface shape of the sixth lens element is conventional, then the manufacturing is simpler, but the correction of aberration is insufficient
Solution Approach 1:
The sixth lens element features aspheric surfaces on both object-side and image-side, with optimized curvature radii and conic coefficients. This design effectively corrects residual aberrations and enhances overall image quality, demonstrating the application of curved surface geometry to solve optical correction problems.
4Manufacturing precision
If more lens elements are added to enhance image quality, then the aberration correction is improved, but the total track length increases
Solution Approach 1:
The patent utilizes aspheric surfaces with optimized curvature radii and conic coefficients on multiple lens elements to achieve effective aberration correction in a compact configuration. This parameter optimization allows six elements to provide superior correction without proportionally increasing the total track length, resolving the contradiction between image quality and compactness.
Solution Approach 2:
The invention transitions from conventional spherical surfaces to aspheric surfaces, adding dimensional complexity to the surface geometry. This enables more effective aberration correction within a compact form factor, as the aspheric profiles provide additional degrees of freedom for controlling light paths without increasing axial length.
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 optical imaging lens assembly effectively corrects astigmatism and spherical aberration in both paraxial and off-axis regions, enhancing image quality and reducing the total track length, while allowing for the use of glass or plastic materials to balance cost and performance.
Implementation Method 1
The optical imaging lens assembly includes six lens elements with specific refractive powers and aspheric surfaces that refract light to correct optical aberrations
Implementation Method 2
both of an object-side surface and an image-side surface of the fifth lens element are aspheric, wherein at least one of the object-side surface and the image-side surface of the fifth lens element has at least one inflection point
Data Source
AI summary
An optical 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 object-side surface. The second lens element with negative refractive power has a concave object-side surface and a convex image-side surface. The third lens element and the fourth lens element both have refractive power. The fifth lens element has refractive power, wherein both of the surfaces thereof are aspheric. The sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface, wherein the surfaces thereof are aspheric. The optical imaging lens assembly has a total of six lens elements with refractive power.