Five-Element Optical Lens Assembly for Mobile Terminals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional compact optical systems for mobile terminals face challenges in achieving high resolution and image quality while maintaining a large field of view and sufficient back focal length, particularly with five-element lens structures that struggle to incorporate additional optical elements.
Innovation Solution
A five-element optical lens assembly with specific refractive power configurations, including positive and negative refractive powers, aspheric surfaces, and inflection points, optimized to enhance image quality, field of view, and manufacturing feasibility, using materials like glass or plastic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a five-element lens structure is used to enhance image quality and resolution, then image quality is improved, but the field of view cannot be enlarged and back focal length is insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers of individual lens elements (f1, f2, f3, f4, f5) and their combinations to satisfy specific mathematical relationships. This allows the five-element lens to achieve both high image quality and enlarged field of view by carefully controlling focal length ratios and optical power distribution across the lens elements.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements (particularly the fourth and fifth elements) to correct optical aberrations and improve image quality. The aspheric design allows for better light ray control across the expanded field of view while maintaining compact dimensions, resolving the contradiction between field of view enlargement and image quality preservation.
2Manufacturing precision
If a five-element lens structure is used to enhance image quality, then image quality is improved, but back focal length is insufficient for incorporating other optical elements
Solution Approach 1:
The patent uses parameter changes by optimizing the focal length ratios between lens elements, specifically satisfying the condition |f2/f5|≥2.0 and |f/f4|+(f/f5)≥2.0. These parameter relationships enable the system to achieve adequate back focal length while maintaining high image quality through controlled optical power distribution.
Solution Approach 2:
The patent addresses the back focal length limitation by utilizing the axial dimension (depth) more efficiently through optimized lens spacing and focal length relationships. By carefully controlling the distance between lens elements and the image plane, the system creates sufficient back focal length space for incorporating additional optical elements like filters or sensors without compromising image quality.
3Measurement precision
If refractive power is increased to improve resolution, then resolution is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies aspheric surface design to the fourth and fifth lens elements to correct higher-order optical aberrations that arise from increased refractive power. This allows the system to achieve high resolution while managing manufacturing complexity through standardized aspheric manufacturing processes rather than requiring complex multi-element configurations.
Solution Approach 2:
The patent optimizes the refractive power parameters of individual lens elements to satisfy specific mathematical relationships (|f2/f5|≥2.0, |f/f4|+(f/f5)≥2.0). This parameter optimization enables high resolution achievement while controlling manufacturing complexity by balancing the optical power across elements rather than concentrating it in a single difficult-to-manufacture component.
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 optical lens assembly provides improved image quality, increased field of view, and the ability to incorporate additional optical elements, addressing the limitations of conventional systems while reducing manufacturing complexity and costs.
Implementation Method 1
an optical 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
Data Source
AI summary
An optical 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 with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The third lens element has refractive power. The fourth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The fifth lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, and the image-side surface thereof has at least one convex shape in an off-axial region thereof.