Six-Element Optical Imaging Lens Compact System Length
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Solution Overview
Problem
Optical imaging lenses face challenges in achieving a balance between being light, thin, short, and providing a large field of view while maintaining good imaging quality, particularly in mobile devices where the distance from the object-side surface to the image-side surface along the optical axis needs to be minimized.
Innovation Solution
The design incorporates six lens elements with specific refracting powers and surface curvatures, including negative and positive refracting powers, convex and concave regions, and Abbe number constraints to optimize the optical imaging lens's field of view and system length, adhering to conditions such as Li11t42/L42t62≥2.400 and V3+V4+V5≤120.000, which allows for a larger field of view and reduced system length while maintaining good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distance from the object-side surface to the image-side surface along the optical axis is increased, then the field of view and imaging quality can be improved, but the system length increases making it unsuitable for mobile devices
Solution Approach 1:
The optical system is divided into six lens elements with different refracting powers and surface curvatures. Each lens element is designed with specific convex and concave regions to control light paths. This segmentation allows the system to achieve a large field of view while keeping the overall length compact by distributing optical functions across multiple elements rather than requiring a single long optical path.
Solution Approach 2:
The patent utilizes aspheric surfaces with specific curvature radii in different regions (optical axis region vs. periphery region) to control aberrations. By designing surfaces with different curvatures in different dimensional regions, the system corrects optical aberrations without increasing the axial length, effectively using spatial dimensionality to solve the field of view vs. length contradiction.
2Length of moving object
If the system length is shortened for mobile devices, then the lens can be made lighter and thinner, but the field of view and imaging quality deteriorate
Solution Approach 1:
Each lens element is designed with different surface curvature characteristics in different regions. For example, the first lens element has a convex object-side surface and concave image-side surface, while the second lens element has convex surfaces on both sides. This local differentiation of surface qualities allows each lens to contribute specifically to aberration correction, maintaining imaging quality despite the compact overall length.
Solution Approach 2:
The patent specifies precise parameter ranges including the ratio Li11t42/L42t62≥2.400 and Abbe number constraints (V3+V4+V5≤120.000). By optimizing these parameters, the system achieves a balance between compact length and high imaging quality, correcting chromatic and spherical aberrations through careful selection of lens materials and geometries.
3Manufacturing precision
If the F-number is reduced to improve light gathering capability, then the imaging quality improves, but the system length and complexity increase
Solution Approach 1:
The six-lens system is designed to perform multiple functions simultaneously: correcting chromatic aberration, correcting spherical aberration, controlling field curvature, and achieving a large field of view. By integrating these functions into a compact six-element configuration rather than using separate dedicated elements for each function, the system achieves high imaging quality without proportionally increasing complexity.
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
This configuration effectively enhances the field of view and reduces the system length of the optical imaging lens, improving imaging quality and aberration correction, particularly in chromatic and spherical aberrations, while ensuring ease of manufacturing and assembly.
Implementation Method 1
The first lens element has negative refracting power. A periphery region of the image-side surface of the second lens element is convex. An optical axis region of the object-side surface of the third lens element is convex.
Data Source
AI summary
An optical imaging lens including first, second, third, fourth, fifth and sixth lens elements sequentially along an optical axis from an object side to an image side is provided. The first to sixth lens elements each includes an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing imaging rays to pass through. The optical imaging lens has only the six lens elements and satisfies condition expressions of Li11t42/L42t62≥2.400 and V3+V4+V5≤120.000.