Five-Element Aspheric Lens for Mobile Imaging Aberration Correction
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Solution Overview
Problem
Conventional optical systems for mobile terminals, such as smartphones and tablets, fail to meet the requirements for high resolution and image quality due to unfavorable refractive power distribution and aberration correction in compact designs.
Innovation Solution
An optical imaging lens assembly comprising five lens elements with specific refractive powers and surface configurations, including positive and negative refractive powers, aspheric surfaces, and optimized axial distances, to reduce total track length, correct aberrations, and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional four-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 optical imaging lens assembly is divided into five distinct lens elements (first through fifth lens elements), each with specific refractive power characteristics and surface configurations. This segmentation allows independent optimization of each element's function, enabling better overall image quality and aberration correction while maintaining manageable device complexity
Solution Approach 2:
Different regions of the lens surfaces are designed with different properties: the fifth lens element has a concave image-side surface in the paraxial region and convex shapes in off-axis regions. This local quality differentiation enables simultaneous correction of on-axis and off-axis aberrations, improving image quality across the entire field of view
2Manufacturing precision
If a five-element lens structure is used to enhance image quality, then the resolution is improved, but the total track length increases and aberration correction becomes difficult
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements, changing the geometric parameters from traditional spherical shapes. This parameter change enables more compact lens spacing and reduced total track length while providing additional degrees of freedom for aberration correction, simultaneously addressing both compactness and image quality requirements
Solution Approach 2:
The fifth lens element features a concave image-side surface in the paraxial region with convex shapes in off-axis regions, utilizing complex curvature variations to correct aberrations. This curvature design allows effective aberration correction in a compact configuration, reducing the total track length while maintaining high image quality
3Length of stationary object
If the fifth lens element has a purely concave image-side surface, then the total track length is reduced, but the off-axis aberration correction is insufficient
Solution Approach 1:
The fifth lens element's image-side surface is designed with different local properties: concave in the paraxial region for compactness and convex in off-axis regions for aberration correction. This local quality differentiation enables the surface to simultaneously achieve short total track length and effective off-axis aberration correction
Solution Approach 2:
The image-side surface of the fifth lens element is functionally segmented into paraxial and off-axis regions, each with different curvature characteristics. This segmentation allows independent optimization of each region's function, achieving both compact overall length and superior off-axis image quality
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 reduces photosensitivity, spherical aberration, and chromatic aberration, while enlarging the field of view and maintaining a compact size, suitable for high-resolution image capture in mobile devices.
Implementation Method 1
The optical imaging lens assembly includes five lens elements with aspheric surfaces that refract light to correct aberrations and reduce photosensitivity
Implementation Method 2
The aspheric surfaces of the lens elements correct spherical aberration by varying the curvature across the surface to focus light rays
Implementation Method 3
The optical imaging lens assembly corrects chromatic aberration through the dispersion properties of the lens materials and their strategic arrangement
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 and a fifth lens element. The first lens element has positive refractive power. The second lens element has positive refractive power. The third lens element has positive refractive power. The fourth lens element with positive refractive power has a convex image-side surface. The fifth lens element with refractive power has a concave image-side surface in a paraxial region thereof, wherein the image-side surface of the fifth lens element has at least one convex shape in an off-axis region thereof, and the surfaces thereof are aspheric. The optical imaging lens assembly has a total of five lens elements with refractive power.