Eight-Element Optical Imaging Lens for Aberration and Flare Control
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Solution Overview
Problem
Existing optical imaging lenses face challenges in achieving a compact design while maintaining high imaging quality, large image height, and small F-number, leading to issues with lens aberration, chromatic aberration, and flare.
Innovation Solution
An optical imaging lens design comprising eight lens elements with specific surface shapes and refracting powers, including concave and convex regions, arranged to correct edge aberration, improve spherical aberration, reduce distortion, and alleviate chromatic aberration, using plastic materials for the lens elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of optical lens elements is increased to improve imaging quality and correct aberrations, then the imaging quality improves, but the distance between the object-side surface and the image plane increases, making it difficult to reduce the thickness of mobile phones and digital cameras
Solution Approach 1:
The optical lens divides the imaging function into eight distinct lens elements, each with specific refractive powers and surface shapes. This segmentation allows complex aberration correction to be distributed across multiple elements while maintaining a compact overall structure, resolving the contradiction between improved imaging quality and increased system length.
Solution Approach 2:
Different lens elements have locally optimized properties: the third lens element has a concave periphery region on its object-side surface, the fifth lens element has mixed concave-convex regions, and the seventh lens element has negative refracting power. These localized structural variations enable effective aberration correction within a compact form factor.
2Illumination intensity
If the F-number is reduced to increase luminous flux, then the luminous flux increases, but the lens aberration and chromatic aberration become more difficult to control
Solution Approach 1:
The optical lens employs specific parameter relationships among the eight lens elements, including the Abbe number constraint (V2+V3+V4+V6)/V7≤5.500 and specific refractive power distributions. These parameter optimizations enable the system to maintain small F-number for high luminous flux while effectively controlling lens aberration and chromatic aberration through coordinated design of all elements.
3Area of stationary object
If the image height is increased to enlarge pixel size for night shooting, then the pixel size increases, but the distortion and edge aberration increase
Solution Approach 1:
The optical lens utilizes aspheric surfaces with specifically designed curvature variations. The third lens element has a concave periphery region, the fifth lens element has mixed concave-convex regions, and other elements have optimized surface curvatures. These curvature designs enable the system to achieve great image height for large pixel size while effectively correcting distortion and edge aberration.
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 design achieves a compact optical imaging lens with improved imaging quality, reduced flare, and enhanced chromatic aberration correction, maintaining good optical properties with a greater image height and small F-number.
Implementation Method 1
Each of the first lens element to the eighth lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through
Data Source
AI summary
An optical imaging lens is provided. The optical imaging lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element sequentially arranged along an optical axis from an object side to an image side. The third lens element has positive refracting power, and a periphery region of an object-side surface of the third lens element is concave. An optical axis region of an image-side surface of the fifth lens element is concave, and a periphery region of the image-side surface of the fifth lens element is convex. An optical axis region of an object-side surface of the sixth lens element is concave. The seventh lens element has negative refracting power. Lens elements of the optical imaging lens are only the eight lens elements.