Five-Element Mobile Lens Assembly for Compact Wide-Angle Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical systems in mobile terminals struggle to achieve high image quality and compact size with wide viewing angles while effectively correcting astigmatism and chromatic aberrations.
Innovation Solution
A five-element optical photographing lens assembly with specific refractive powers and surface designs, including aspheric surfaces with inflection points, is used to balance refractive power distribution and reduce total track length, incorporating a combination of convex and concave surfaces to optimize image quality and compactness.
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 viewing angle are insufficient
Solution Approach 1:
The lens assembly is divided into five distinct lens elements with different refractive powers and surface characteristics. Each element is optimized for specific functions: the first element provides wide viewing angle, the second and third elements correct astigmatism, the fourth element controls chromatic aberration, and the fifth element optimizes image quality. This segmentation allows each element to be designed and manufactured with specific precision requirements while achieving overall system optimization.
2Manufacturing precision
If a five-element lens structure is used to enhance image quality, then the manufacturing precision improves, but the device complexity increases
Solution Approach 1:
Different regions of the lens assembly have different optical properties optimized for their specific functions. The first lens element has a convex object-side surface optimized for wide viewing angle, while the second and third elements have specific concave-convex configurations optimized for astigmatism correction. The fourth element has a concave image-side surface optimized for chromatic aberration control, and the fifth element has an aspheric surface optimized for image quality. This local optimization allows the complex five-element structure to be managed through functional specialization.
3Length of moving object
If the total track length is reduced for compact size, then the length of moving object decreases, but the refractive power distribution becomes challenging
Solution Approach 1:
The lens elements are designed with specific refractive power parameters to achieve compact total track length while maintaining optimal performance. The first element has positive refractive power for wide viewing angle, the second and third elements have positive refractive power for astigmatism correction, the fourth element has positive refractive power for chromatic aberration control, and the fifth element has negative refractive power for image quality optimization. This parameter optimization allows the system to achieve compact size without sacrificing optical performance.
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 provides improved image quality with a wide viewing angle and compact size, effectively correcting astigmatism and chromatic aberrations, while allowing for the use of glass or plastic materials to balance design flexibility and cost.
Implementation Method 1
The first lens element has refractive power. The second lens element has positive refractive power. The third lens element with positive refractive power has an image-side surface being concave in a paraxial region thereof.
Data Source
AI summary
An optical photographing 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 refractive power. The second lens element has positive refractive power. The third lens element with positive refractive power has an image-side surface being concave in a paraxial region thereof. The fourth lens element has refractive power. The fifth lens element with refractive power has an image-side surface being concave in a paraxial region thereof, wherein an object-side surface and the image-side surface of the fifth lens element are aspheric, and at least one of the surfaces of the fifth lens element has at least one inflection point. The optical photographing lens assembly has a total of five lens elements with refractive power.