Five-Lens Mobile Camera Assembly Aberration Correction
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Solution Overview
Problem
Conventional compact photographing lens assemblies for mobile devices fail to meet the demands for high-resolution and miniaturization, resulting in suboptimal image quality and increased size.
Innovation Solution
A photographing optical lens assembly comprising specific lens elements with aspheric surfaces and refractive powers, including a first lens with positive power, a second with negative power, a third with positive or negative power, a fourth with positive power, and a fifth with negative power, optimized by conditions such as |f/f3| < 0.65 and 0.1 < T34/T45 < 2.7, to correct aberrations and reduce the overall length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-lens assembly is used, then the device remains compact, but the image quality and resolution are insufficient
Solution Approach 1:
The patent divides the optical system into five distinct lens elements instead of four, with each element having specific refractive power and surface characteristics. This segmentation allows for better correction of optical aberrations and improved image quality while maintaining a compact form factor suitable for mobile devices
Solution Approach 2:
The patent applies aspheric surfaces to specific lens elements (third and fifth elements) rather than all elements, optimizing local optical properties where needed. The fifth lens element specifically uses an aspheric surface to correct aberrations, demonstrating local quality enhancement without uniformly complicating the entire system
2Manufacturing precision
If more lens elements are added to improve image quality, then the resolution and image quality improve, but the overall size of the lens assembly increases
Solution Approach 1:
The patent arranges the five lens elements in a compact sequence along the optical axis with optimized spacing between them. The elements are positioned closely together with specific axial distances (T34, T45) that minimize the overall length while maintaining proper optical function, effectively nesting the components in a space-efficient manner
Solution Approach 2:
The patent specifies particular parameter ranges for the lens elements including refractive powers (positive or negative), axial distances (T34/T45 ratio), and curvature radii. By optimizing these parameters, the system achieves high image quality with a compact form factor that fits mobile device requirements
3Manufacturing precision
If aspheric surfaces are used to correct aberrations, then the image quality improves, but the manufacturing difficulty and cost increase
Solution Approach 1:
The patent applies aspheric surfaces selectively to only the third and fifth lens elements rather than all five elements. This localized application corrects the most critical aberrations while minimizing the number of complex surfaces that require difficult manufacturing processes, thereby balancing performance with manufacturability
Solution Approach 2:
The patent specifies that the fifth lens element is made of plastic material with an aspheric surface. Plastic lenses can be manufactured more easily and cost-effectively than glass lenses, even with aspheric surfaces, using injection molding techniques. This choice prioritizes cost-effective manufacturing while still achieving the desired aberration correction
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 enhances image quality, miniaturizes the lens assembly, and balances telecentricity and wide-angle views, while allowing for cost-effective manufacturing using plastic lenses, thereby addressing the limitations of conventional designs.
Implementation Method 1
a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with refractive power, a fourth lens element with positive refractive power and a fifth lens element
Data Source
AI summary
A photographing optical lens assembly comprising, in order from an object side to an image side, a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with refractive power, a fourth lens element with positive refractive power and a plastic fifth lens element is mentioned. The third lens element comprises a convex object-side surface and a concave image-side surface. The fourth lens element comprises a convex object-side surface and a convex image-side surface. The fifth lens element comprises a concave image-side surface. The surfaces of the third and fifth lens elements are aspheric. The fifth lens element comprises at least one inflection point. By adjusting the refractive power of the third lens element, and adjusting the total length of the photographing optical lens assembly, the total volume of the lens assembly is reduced, and the image quality is improved.