Four-Element Imaging Lens with Abbe Number Optimization
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Solution Overview
Problem
Existing imaging lenses with four lens elements face challenges in achieving a balance between compactness and optical performance, as they often compromise on certain optical characteristics to achieve specific combinations, leading to suboptimal image quality.
Innovation Solution
The proposed imaging lens system consists of four sequentially arranged lens elements with specific Abbe numbers and diameter ratios, along with an optical filter and air gaps, to optimize optical performance while maintaining compactness. Each lens element has an object-side and imaging-side surface, with the Abbe numbers and diameter ratios carefully selected to enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If four lens elements are arranged sequentially with specific Abbe numbers and diameter ratios, then optical characteristics and image quality are improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by specifying precise Abbe number differences (vd1-vd2>30, vd3-vd4>30) and diameter ratios (0.45<d2/d1<0.75, 0.45<d4/d3<0.75) for the lens elements. These parameter constraints optimize the optical characteristics and image quality while maintaining a manageable four-element structure, resolving the contradiction between performance and complexity.
2Reliability
If lens elements are designed with specific Abbe number differences and diameter ratios, then aberrations are minimized and optical performance is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges for Abbe numbers (vd1-vd2>30, vd3-vd4>30) and diameter ratios (0.45<d2/d1<0.75, 0.45<d4/d3<0.75) that optimize optical performance while establishing clear manufacturing specifications. These parameter constraints provide guidance for manufacturing processes, balancing performance enhancement with manufacturability.
3Length of moving object
If the lens system is designed for compactness with reduced clear aperture diameters, then device dimensions are reduced, but optical performance may be compromised
Solution Approach 1:
The patent achieves compactness through optimized parameter selection including diameter ratios (0.45<d2/d1<0.75, 0.45<d4/d3<0.75) and spacing ratios (0.15<s1/d1<0.40, 0.15<s3/d3<0.40). These parameter constraints enable reduced clear aperture diameters and compact device dimensions while maintaining optical performance through the specified Abbe number differences and structural optimization.
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 improves the optical characteristics of the imaging lens system, achieving better image quality and compactness by optimizing the Abbe numbers, diameter ratios, and air gaps, which minimizes aberrations and distortion, suitable for high-performance imaging applications.
Implementation Method 1
first, second, third, and fourth lens elements arranged sequentially in order from an object side to an imaging side
Implementation Method 2
The object-side and imaging-side surfaces of each lens element can be coated with an anti-reflective coating
Data Source
AI summary
A four element lens system for use with an imaging sensor includes first, second, third, and fourth lens elements and an optical filter that are arranged sequentially in order from an object side to an imaging side. The lens elements are coated with an anti-reflective film. The lens system further includes an optical filter that is disposed at a distance from the imaging sensor. The lens elements are relatively positioned to each other to satisfy specific conditions. The lens elements further include thickness to diameters ratios that satisfy specific conditions.