Six-Element Lens Assembly Aberration Correction
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Solution Overview
Problem
Conventional compact optical systems for portable electronic products, such as smartphones and tablets, fail to meet the requirements for high resolution and image quality due to limitations in lens design, particularly with six-element lens structures that are difficult to mold and result in unfavorable spacing between lens elements.
Innovation Solution
A photographing lens assembly comprising six lens elements with specific refractive powers and surface shapes, including aspheric surfaces, that satisfy certain conditions to optimize image quality, correct aberrations, and improve moldability, allowing for a compact and high-quality optical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a six-element lens structure is used to enhance image quality and resolution, then image quality is improved, but the surface shape of the second lens element becomes excessively curved making it difficult to mold
Solution Approach 1:
The patent applies parameter changes by optimizing the curvature radius of the second lens element's image-side surface (R4) to satisfy the condition −1.0 < f/R4 ≤ 0, where f is the focal length. This parameter optimization allows the lens to maintain high image quality while achieving a surface shape that is feasible for injection molding, thus resolving the contradiction between manufacturing precision and ease of manufacture.
2Manufacturing precision
If the second lens element has an excessively curved surface shape, then image quality is improved, but the distance between the peripheral regions of the second lens element and the third lens element becomes rather small
Solution Approach 1:
The patent uses parameter changes to optimize the curvature radius R4 of the second lens element's image-side surface, satisfying −1.0 < f/R4 ≤ 0. This optimization balances the curvature needed for high image quality with the physical spacing required between lens elements, ensuring both optical performance and mechanical feasibility in compact designs.
3Device complexity
If conventional four-element or five-element lens structures are used, then device complexity is reduced, but the requirements for high resolution and image quality cannot be satisfied
Solution Approach 1:
The patent applies universality by designing a six-element lens assembly where each lens element serves multiple functions: the first element provides positive refractive power for basic focusing, the second element with optimized curvature corrects aberrations while maintaining moldability, the third element provides positive refractive power, the fourth element with concave object-side surface corrects field curvature, the fifth element with biconvex shape provides additional positive power, and the sixth element with aspheric surfaces corrects distortion and higher-order aberrations. This multi-functional design achieves high image quality that cannot be obtained with fewer elements.
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 proposed lens assembly achieves improved image quality, compactness, and manufacturability, enabling the production of high-resolution images in portable electronic devices while reducing spherical aberration and sensitivity.
Implementation Method 1
The first lens element has positive refractive power. The second lens element has refractive power. The third lens element has positive refractive power. The fourth lens element with refractive power has an object-side surface being concave in a paraxial region thereof.
Implementation Method 2
an object-side surface and the image-side surface of the sixth lens element are aspheric
Data Source
AI summary
A photographing 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 has positive refractive power. The second lens element has refractive power. The third lens element has positive refractive power. The fourth lens element with refractive power has an object-side surface being concave in a paraxial region thereof. The fifth lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The sixth lens element with refractive power has an image-side surface being concave in a paraxial region thereof. The photographing lens assembly has a total of six lens elements with refractive power.