Five-Lens Optical Imaging Assembly with Abbe Number Constraints
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Solution Overview
Problem
Conventional optical imaging lens assemblies face challenges in achieving miniaturization, high imaging quality, and compact size while maintaining low sensitivity and high manufacturability, particularly in portable electronic devices.
Innovation Solution
The optical imaging lens assembly consists of five lenses with specific refractive powers, surface types, and configurations, including aspherical surfaces, carefully optimized to achieve a balance of refractive powers, focal lengths, and thicknesses, along with appropriate material selection and surface curvatures to reduce aberrations and sensitivity, and enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to improve imaging quality, then imaging performance is improved, but device complexity and size increase
Solution Approach 1:
The optical imaging lens assembly divides the imaging function into five distinct lens elements, each with specific refractive powers (+, -, +, +, -) and optimized parameters. This segmentation allows each lens to contribute to correcting specific aberrations while maintaining overall system performance and enabling compact arrangement.
Solution Approach 2:
The patent optimizes multiple parameters including the Abbe number difference between first and second lenses (|V1-V2|≥30), focal length ratios (1.5≤f3/f4≤7.5, 0.5≤|f4/R8|≤2.0), and refractive index differences (0.3≤|N1-N2|≤0.5). These parameter constraints enable high imaging quality while maintaining a compact five-lens configuration.
2Volume of moving object
If the lens assembly is miniaturized to reduce device size, then portability is improved, but imaging quality and aberration control deteriorate
Solution Approach 1:
The patent employs aspherical surfaces on multiple lens elements (first, second, third, fourth, and fifth lenses) to control aberrations in the miniaturized system. The aspherical coefficients enable precise wavefront control within a compact form factor, maintaining imaging quality despite reduced size.
Solution Approach 2:
The five lens elements are arranged in a compact sequence with optimized spacing along the optical axis. The lens assembly achieves a total track length (TTL) to image height (ImgH) ratio of TTL/ImgH≤1.5, effectively nesting the optical elements within a minimal volume while maintaining functional performance.
3Use of energy by moving object
If the aperture is increased to improve light gathering capability, then imaging performance is improved, but sensitivity to aberrations and manufacturing errors increases
Solution Approach 1:
The patent converts the potential harm of large aperture-induced aberrations into benefit by using the increased light gathering capability combined with aspherical surfaces and optimized refractive index distributions. The Abbe number difference constraint (|V1-V2|≥30) and focal length ratios transform what would be aberration-prone conditions into advantages for controlling chromatic and spherical aberrations.
Solution Approach 2:
The patent uses lens materials with specifically selected refractive indices (N1, N2, N3, N4, N5) and Abbe numbers to create a composite optical system. The refractive index difference constraint (0.3≤|N1-N2|≤0.5) enables the assembly to function as a composite optical material system that reduces sensitivity to manufacturing errors while maintaining high aperture performance.
4Ease of manufacture
If the lens parameters are optimized to reduce sensitivity and improve manufacturability, then ease of manufacture is improved, but imaging quality may deteriorate
Solution Approach 1:
The patent establishes specific parameter ranges that balance manufacturability and imaging quality: Abbe number difference (|V1-V2|≥30), focal length ratios (1.5≤f3/f4≤7.5, 0.5≤|f4/R8|≤2.0), refractive index differences (0.3≤|N1-N2|≤0.5), and thickness ratios (1.5≤CT3/CT2≤3). These constrained parameter ranges enable standard manufacturing processes to achieve high imaging quality without requiring ultra-precise or specialized fabrication.
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 results in a compact, high-quality optical imaging lens assembly with improved imaging performance, reduced sensitivity, and enhanced manufacturability, suitable for portable electronic devices.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are provided in sequence from an object side to an image side along an optical axis and have refractive powers
Data Source
AI summary
An embodiment of the present disclosure provides an optical imaging lens assembly, which sequentially includes, from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens and a fifth lens with refractive power. The first lens has a positive refractive power, the fourth lens has a positive refractive power, and the fifth lens has a negative refractive power. An abbe number V1 of the first lens and an abbe number V2 of the second lens satisfy the following relationship 45<|V1−V2|<70.