Six-Element Lens Assembly Aberration Correction via Aspheric Curvature
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Solution Overview
Problem
Conventional compact optical systems for mobile terminals, such as those in smartphones and tablets, face challenges in achieving high resolution and image quality due to severe aberrations and high sensitivity, particularly with six-element lens structures that result in defocused images in off-axis regions.
Innovation Solution
A photographing optical lens assembly comprising six lens elements with specific refractive powers and surface curvatures, including a first lens with positive refractive power, a second lens with refractive power, a third lens with negative refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power, and a sixth lens with positive refractive power, where the sixth lens has a convex object-side surface and a concave image-side surface in the paraxial region, and at least one convex shape in the off-axis region, optimizing the arrangement to reduce aberrations and maintain a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a six-element lens structure is used to enhance resolution and image quality, then the image quality improves, but severe aberrations and high sensitivity occur
Solution Approach 1:
The patent applies local quality by giving different surface shapes to different regions of the sixth lens element. The object-side surface has a convex shape in the paraxial region and a concave shape in the off-axis region, allowing each region to contribute differently to aberration correction. This local differentiation enables the lens to maintain high image quality while reducing severe aberrations that would affect the entire optical system.
Solution Approach 2:
The patent utilizes curvature principles by employing aspheric surfaces on the sixth lens element with specifically designed convex and concave shapes. The object-side surface features a convex shape in the paraxial region transitioning to a concave shape in the off-axis region, while the image-side surface has a concave shape in the paraxial region and a convex shape in the off-axis region. These curved surface designs enable effective aberration correction across different field regions.
2Volume of moving object
If a conventional six-element lens structure is used, then the lens assembly is compact, but images are overly curved and defocused in off-axis regions
Solution Approach 1:
The patent addresses off-axis imaging deficiencies by applying local quality to the sixth lens element's surface design. The object-side surface has a concave shape specifically in the off-axis region, while the image-side surface has a convex shape in the off-axis region. This localized surface shaping compensates for field curvature and keeps off-axis images in focus without increasing the overall optical system size.
Solution Approach 2:
The patent uses advanced curvature design on the sixth lens element to correct off-axis defocusing. The aspheric surfaces with convex and concave shapes in different regions enable the lens to maintain a compact form factor while achieving proper focus across the entire image plane, including off-axis regions that would otherwise be overly curved and defocused.
3Reliability
If the sixth lens element has a convex object-side surface and concave image-side surface in the paraxial region with additional convex shape in the off-axis region, then aberrations are corrected and sensitivity is reduced, but the lens design complexity increases
Solution Approach 1:
The patent implements local quality by dividing the sixth lens element's surface into different functional regions with distinct shapes. The object-side surface has a convex shape in the paraxial region and a concave shape in the off-axis region, while the image-side surface has a concave shape in the paraxial region and a convex shape in the off-axis region. This region-specific design enables effective aberration correction and sensitivity reduction, with the added benefit that the entire complex surface can be manufactured as a single aspheric element rather than multiple simpler lenses.
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 sensitivity, and improves image quality across both paraxial and off-axis regions, ensuring high-resolution images while maintaining a compact optical system suitable for mobile terminals.
Implementation Method 1
The sixth lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one convex shape in an off-axis region thereof
Data Source
AI summary
A photographing optical lens system includes, in order from object side to 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 an object-side surface being convex in a paraxial region thereof. The second lens element has refractive power. The third lens element has negative refractive power. The fourth lens element has negative refractive power. The fifth lens element has refractive power. The sixth lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one convex shape in an off-axis region thereof.