Five-Lens Telephoto Assembly Balancing Miniaturization and Image Quality
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Solution Overview
Problem
Conventional image capturing modules with telephoto shooting functions in portable electronic devices face challenges in achieving a balance between image quality, telephoto functions, and miniaturization due to restricted view angles, limiting their ability to produce high-quality images.
Innovation Solution
An image system lens assembly comprising five lens elements with specific refractive powers and surface curvatures, including positive and negative refractive powers, convex and concave surfaces, and air gaps between adjacent lens elements, optimized to achieve a balance between telephoto functions and miniaturization while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional image capturing modules use limited space for telephoto functions, then device size is reduced, but image quality deteriorates
Solution Approach 1:
The image capturing module is divided into five distinct lens elements with different refractive powers and surface curvatures. Each lens element is optimized for specific functions: the first lens element (positive refractive power) for light gathering, the second lens element (negative refractive power with convex object-side surface) for aberration correction, the third lens element (negative refractive power) for focal length adjustment, the fourth lens element (positive refractive power with convex image-side surface) for image quality enhancement, and the fifth lens element (negative refractive power) for telephoto function optimization. This segmentation allows each component to contribute specifically to resolving the contradiction between compact size and image quality.
Solution Approach 2:
The patent employs precise parameter optimization including specific refractive power ranges for each lens element, controlled axial distances between elements (T23, T34, T45), and defined surface curvature characteristics. The conditional expressions (0.10 < BL/T23, T23/T34, TL/f < 1.0, 0 < T45/CT5, 0 < T12/CT1) establish optimal parameter ranges that enable the module to achieve telephoto functions with reduced volume while maintaining high image quality through mathematical optimization of optical parameters.
2Adaptability or versatility
If view angle is restricted for telephoto functions, then telephoto capability is improved, but image quality deteriorates
Solution Approach 1:
Different regions of the lens assembly are designed with locally optimized qualities: the second lens element specifically features a convex object-side surface in its paraxial region to correct spherical aberrations, while the fourth lens element has a convex image-side surface in its paraxial region to enhance image quality. These local quality optimizations ensure that even with restricted view angles for telephoto functions, the central image region maintains high quality through targeted aberration correction at critical locations.
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 enables the image system lens assembly to achieve high image quality, balance telephoto functions with reduced volume, and maintain a suitable view angle, addressing the limitations of conventional modules.
Implementation Method 1
a first lens element having positive refractive power; a second lens element with negative refractive power having an object side-surface being convex in a paraxial region thereof; a third lens element; a fourth lens element having positive refractive power; and a fifth lens element
Data Source
AI summary
An image system lens assembly includes five lens elements, the five lens elements being, in order from an object side to an image side: a first lens element; a second lens element having an object side-surface being convex in a paraxial region thereof; a third lens element having negative refractive power; a fourth lens element with positive refractive power having an image-side surface being convex in a paraxial region thereof; and a fifth lens element having negative refractive power.