Six-Element Aspheric Lens Assembly for Compact Imaging
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Solution Overview
Problem
Conventional compact optical lens systems for portable electronic devices fail to meet the demands for high resolution and image quality, particularly due to issues like vignetting and increased size, which restrict their application in mobile products with high-end specifications.
Innovation Solution
A compact imaging lens assembly comprising six lens elements with specific refractive powers and surface curvatures, including aspheric surfaces and inflection points, is designed to optimize image quality by controlling light angles and reducing aberrations, while maintaining a compact size through careful arrangement of lens elements and materials like glass or plastic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-element or five-element lens structure is used, then the device complexity is reduced, but the image quality and resolution cannot satisfy high-end requirements
Solution Approach 1:
The lens system is divided into six distinct lens elements with specific refractive power distributions (positive, negative, and mixed). Each element is optimized for specific aberration correction, with the fourth element having negative refractive power and the fifth and sixth elements having positive refractive power. This segmentation allows comprehensive control of optical aberrations while maintaining compact form factor.
Solution Approach 2:
The fifth and sixth lens elements incorporate aspheric surfaces with inflection points to control light angles and correct aberrations. The aspheric profiles include specific curvature radius relationships (e.g., R9 and R10 for the fifth element) that enable precise control of incident light projection angles onto the image sensor, eliminating vignetting while maintaining compact size.
2Object-affected harmful factors
If the surface shape of the fifth lens element is not optimized, then the device complexity is reduced, but vignetting is generated on the peripheral region of the image
Solution Approach 1:
The fifth lens element features an aspheric object-side surface with curvature radius R9 and an aspheric image-side surface with curvature radius R10. The specific curvature relationship (−3.0 < (R9+R10)/(R9−R10) < −0.5) ensures proper control of incident light angles, preventing vignetting on the peripheral image region while maintaining overall system compactness.
Solution Approach 2:
The aspheric surfaces of the fifth and sixth lens elements include inflection points that change the surface curvature characteristics. This parameter variation in surface shape allows dynamic control of light projection angles across different field regions, effectively eliminating vignetting while keeping the lens system compact.
3Manufacturing precision
If a six-element lens structure with aspheric surfaces is used, then the image quality is improved, but the size of the optical lens system cannot be effectively reduced
Solution Approach 1:
The aspheric surfaces with inflection points enable more efficient light path control, allowing the six-element lens system to achieve superior image quality and aberration correction within a compact form factor. The specific curvature relationships and aspheric profiles reduce the overall optical path length required while maintaining high imaging performance.
Solution Approach 2:
The aspheric surfaces of the fifth and sixth lens elements, with their specific curvature radius relationships and inflection points, enable compact design by more efficiently folding and controlling the light path. This allows the six-element structure to achieve high image quality without proportionally increasing the overall system size.
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 effectively corrects aberrations, reduces vignetting, and maintains a compact size, enabling high image quality and resolution suitable for high-end mobile devices, such as digital cameras and tablets, with improved field of view and aperture characteristics.
Implementation Method 1
The fifth lens element with positive refractive power has a convex object-side surface, wherein the object-side surface and an image-side surface of the fifth lens element are aspheric. The sixth lens element with refractive power has a convex object-side surface and a concave image-side surface, wherein the object-side surface and the image-side surface of the sixth lens element are aspheric
Implementation Method 2
the sixth lens element has at least one inflection point on at least one of the object-side surface and the image-side surface thereof
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 object-side surface. The second lens element has refractive power. The third lens element has positive refractive power. The fourth lens element with negative refractive power has a concave object-side surface and a convex image-side surface. The fifth lens element with positive refractive power has a convex object-side surface, wherein the surfaces thereof are aspheric. The sixth lens element with refractive power has a convex object-side surface and a concave image-side surface, wherein the surfaces thereof are aspheric, and the sixth lens element has at least one inflection point on at least one of the surfaces thereof.