Five-Element Imaging Lens Assembly Aberration Control
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Solution Overview
Problem
Conventional optical systems in portable electronic devices, such as smartphones and PDAs, face challenges in achieving high image quality due to excessive spherical aberrations and overloading of positive refractive power on single lens elements, which limits their ability to meet the demands of high-end camera functionalities.
Innovation Solution
An imaging lens assembly comprising five lens elements with specific refractive powers and surface configurations, including aspheric surfaces, is designed to distribute refractive power effectively, correct aberrations, and maintain a compact size, featuring a combination of convex and concave surfaces with inflection points to optimize image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional optical system with five lens elements is used, then the image quality improves, but the positive refractive power becomes overloaded on one single lens element resulting in excessive spherical aberrations
Solution Approach 1:
The patent divides the positive refractive power into multiple lens elements (first, second, and third lens elements all with positive refractive power) rather than concentrating it in a single element. This segmentation distributes the optical burden and reduces spherical aberrations while maintaining high image quality.
Solution Approach 2:
Each lens element is designed with specific local characteristics - the first lens element has a convex object-side surface, the second has positive refractive power with specific curvature ratios, and the third has refractive power with controlled thickness ratios. These localized optimizations ensure that each element contributes appropriately to the overall optical performance without generating excessive aberrations.
2Device complexity
If the refractive power is concentrated on one lens element, then the device complexity is reduced, but the spherical aberrations increase excessively
Solution Approach 1:
Instead of using a single complex lens element with high refractive power, the patent segments the optical system into multiple simpler lens elements with distributed refractive power. This approach maintains device simplicity while effectively reducing spherical aberrations through the collective action of multiple elements.
3Object-affected harmful factors
If more lens elements are added to distribute refractive power, then spherical aberrations are reduced, but the device complexity increases
Solution Approach 1:
The patent uses exactly five lens elements - no more, no less - to achieve the optimal balance between aberration correction and system complexity. This segmented approach distributes refractive power effectively while maintaining a manageable device structure suitable for portable electronic devices.
Solution Approach 2:
The patent optimizes specific parameters of each lens element (curvature ratios, thickness ratios, axial distances) to ensure that the five-element configuration achieves superior aberration correction without unnecessary complexity. By carefully controlling parameters like T34/CT4 and T45/CT5, the system maintains efficiency and simplicity.
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 balancing refractive powers, reducing spherical aberrations and astigmatism, and enhancing light gathering ability, while also being cost-effective and adaptable for manufacturing, making it suitable for high-end camera applications.
Implementation Method 1
The fourth lens element with refractive power has a concave image-side surface, wherein both of an object-side surface and the image-side surface of the fourth lens element are aspheric. The fifth lens element with refractive power has a concave image-side surface, wherein at least one inflection point is formed on the image-side surface of the fifth lens element, and both of an object-side surface and the image-side surface of the fifth lens element are aspheric.
Data Source
AI summary
An imaging lens assembly includes five lens elements with refractive power, 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 with positive refractive power has a convex object-side surface. The second lens element has positive refractive power. The third lens element has refractive power. The fourth lens element with refractive power has a concave image-side surface, wherein both of an object-side surface and the image-side surface of the fourth lens element are aspheric. The fifth lens element with refractive power has a concave image-side surface, wherein at least one inflection point is formed on the image-side surface of the fifth lens element, and both of an object-side surface and the image-side surface of the fifth lens element are aspheric.