Six-Element Optical Lens Set for Compact Imaging
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Solution Overview
Problem
Current optical imaging lens sets for portable devices face challenges in achieving a shorter length while maintaining good imaging quality, luminous flux, and production cost efficiency, particularly due to longer total lens length affecting device shrinkage and production feasibility.
Innovation Solution
An optical imaging lens set with six lens elements is designed, featuring specific surface shapes and air gaps to optimize refractive power, with a first lens element having a convex object-side surface, a second lens element with a concave image-side surface, and a sixth lens element with a convex image-side surface, along with controlled thickness and air gap ratios to minimize aberrations and enhance resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the total length TTL of the optical imaging lens set is reduced, then the device size is reduced and portability is improved, but the imaging quality and luminous flux may deteriorate
Solution Approach 1:
The optical imaging lens set is divided into six lens elements with different refractive powers arranged in sequence along the optical axis. Each lens element is designed with specific surface shapes (convex/concave portions) to control light paths and correct aberrations, enabling compact total length while maintaining imaging quality through distributed optical functions.
Solution Approach 2:
Different regions of the lens elements are designed with different surface curvatures and refractive properties. The first lens element has a convex object-side surface, the second lens element has a concave image-side surface, and the sixth lens element has a convex image-side surface. These local variations in surface quality optimize light transmission and aberration correction within the compact structure.
2Length of moving object
If the total length TTL is reduced, then the device can be miniaturized for portable electronics, but the field of view may be limited
Solution Approach 1:
The lens system employs variable air gaps between lens elements (G12, G23, G34, G45, G56) that can be optimized to control the field of view. The ratios of these air gaps to lens thicknesses (e.g., AAG/T3≥1.8) are carefully controlled to enable dynamic adjustment of light cone angles, achieving a balance between compact length and adequate field of view for various imaging applications.
3Reliability
If more lens elements are added to improve imaging quality, then the resolution and aberration correction improve, but the total length and device complexity increase
Solution Approach 1:
Each of the six lens elements is designed to perform multiple functions: correcting different types of aberrations (spherical, astigmatic, distortion), controlling luminous flux distribution, and optimizing the overall focal length. The specific surface shapes and air gap configurations allow each element to contribute to multiple performance aspects simultaneously, achieving high imaging quality without requiring excessive number of elements.
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 results in a smaller, cost-effective optical imaging lens set with an enlarged field of view and high image quality, addressing the need for reduced total lens length and improved production feasibility.
Implementation Method 1
Each lens element has an object-side surface facing toward an object side as well as an image-side surface facing toward an image side... with refractive power
Data Source
AI summary
An optical lens set includes a first lens element of an object-side surface with a convex portion in a vicinity of an optical axis, a second lens element of an image-side surface with a concave portion in a vicinity of its periphery and a sixth lens element of an image-side surface with a convex portion in a vicinity of its periphery. T5min is the minimal distance from the object-side surface of the fifth lens element to the image-side surface of the fifth lens element and the fifth lens element has a fifth lens element thickness T5 along the optical axis to satisfy T5min/T5≤0.6.