Six-Element Optical Imaging Lens Assembly for Aberration Control
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Solution Overview
Problem
Conventional compact optical systems with five or six-element lens structures fail to meet the requirements of high resolution and image quality, especially in electronic devices like smartphones and tablets, due to severe aberration, high sensitivity, and defocused images in peripheral regions.
Innovation Solution
An optical imaging lens assembly comprising six lens elements with specific refractive powers and surface shapes, including positive and negative refractive powers, aspheric surfaces, and carefully arranged axial distances, which corrects aberrations and maintains a compact size by optimizing the distribution of refractive powers and reducing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional five-element lens structure is used, then the device complexity is reduced, but the image quality and resolution are insufficient
Solution Approach 1:
The optical system is divided into six distinct lens elements with specific refractive powers (positive and negative) arranged in a particular sequence. Each lens element contributes to correcting specific types of aberrations, allowing the system to achieve high image quality while maintaining reasonable complexity through functional segmentation of the optical path.
2Measurement precision
If a six-element lens structure is used to enhance resolution, then the image quality improves, but the aberration becomes severe and sensitivity increases
Solution Approach 1:
Different lens elements are assigned specific local functions: the first lens element with positive refractive power corrects spherical aberration, the second with negative refractive power corrects coma, the third with positive refractive power corrects astigmatism, and subsequent elements address field curvature and distortion. This localized correction approach allows each element to optimize specific aberrations rather than attempting universal correction, reducing overall system sensitivity.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements (including the fifth and sixth elements) to modify the optical parameters and achieve better aberration control. The aspheric coefficients are specifically optimized to reduce spherical aberration and other monochromatic aberrations, allowing the six-element design to achieve high resolution without the severe aberrations that plague conventional six-element systems.
3Measurement precision
If a six-element lens structure is used, then the resolution is improved, but the image becomes curved and defocused in peripheral regions
Solution Approach 1:
The patent introduces asymmetric aspheric surfaces on the fifth and sixth lens elements to counteract the symmetric field curvature produced by the earlier lens elements. The aspheric coefficients are specifically designed to flatten the image field in peripheral regions while maintaining high resolution across the entire field of view, addressing the image curvature problem that plagues conventional six-element designs.
4Volume of moving object
If the lens elements are arranged with specific axial distances, then the compact size is maintained, but the manufacturing precision requirements increase
Solution Approach 1:
The patent designs the lens elements and their spacing to serve multiple functions simultaneously: the specific axial distances between elements are optimized to achieve compact overall size while also providing aberration correction and maintaining tolerance insensitivity. The aspheric surfaces and refractive power distribution are configured to reduce the impact of manufacturing variations, allowing the system to maintain both compactness and manufacturing feasibility.
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 significantly improves image quality by reducing aberrations, maintaining a compact size, and enhancing image-sensing efficiency, making it suitable for high-resolution applications in electronic devices.
Implementation Method 1
The first lens element with positive refractive power in a paraxial region thereof has an object-side surface being convex in a paraxial region thereof. The second lens element has refractive power in a paraxial region thereof. The third lens element has negative refractive power in a paraxial region thereof.
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, a fifth lens element, and a sixth lens element. The first lens element with positive refractive power in a paraxial region thereof has an object-side surface being convex in a paraxial region thereof. The second lens element has refractive power in a paraxial region. The third lens element has negative refractive power in a paraxial region thereof. The fourth lens element has negative refractive power in a paraxial region thereof. The fifth lens element has refractive power in a paraxial region thereof. The sixth lens element with positive refractive power in a paraxial region thereof has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof.