Compact Optical Imaging Lens with Abbe Number Optimization
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Solution Overview
Problem
Existing optical imaging lenses for portable devices face challenges in achieving a balance between being lightweight, thin, short, and small while maintaining good imaging quality and a small f-number.
Innovation Solution
A four-lens element optical imaging lens design with specific surface shapes and refracting powers, including a concave image-side surface of the first lens element, a convex periphery region of the second lens element, positive refracting power of the third lens, and a convex object-side surface of the fourth lens, along with optimized thickness and air gap ratios, to achieve reduced system length and improved imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical imaging lens is designed to be lighter, thinner, shorter and smaller, then the portability and integration are improved, but the luminous flux and imaging quality deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the Abbe numbers of lens elements (υ2≤30.000 and (υ1+υ3+υ4)≤120.000) and controlling specific dimensional ratios (ALT/BFL≥1.200, AAG/G23≤2.200, etc.) to achieve compact size while maintaining luminous flux and imaging quality through precise control of optical parameters
2Volume of moving object
If the optical imaging lens is designed to be lighter, thinner, shorter and smaller, then the portability and integration are improved, but the imaging quality deteriorates
Solution Approach 1:
The patent maintains imaging quality in a compact design by controlling specific parameter ranges including Abbe numbers (υ2≤30.000, (υ1+υ3+υ4)≤120.000) and dimensional ratios (ALT/BFL≥1.200, TTL/(T3+T4)≥3.800, EFL/AAG≤3.900), ensuring optimal optical performance despite reduced size
Solution Approach 2:
The patent uses composite lens element design with different Abbe number materials (υ2≤30.000 and (υ1+υ3+υ4)≤120.000) to achieve both compact size and high imaging quality through material composition optimization
3Illumination intensity
If the f-number is reduced to increase luminous flux, then the light gathering ability is improved, but the optical system complexity and aberration control difficulty increase
Solution Approach 1:
The patent controls optical system complexity by specifying precise parameter ranges including Abbe numbers (υ2≤30.000, (υ1+υ3+υ4)≤120.000) and dimensional ratios (ALT/BFL≥1.200, AAG/G23≤2.200, EFL/AAG≤3.900), enabling small f-number design with manageable complexity through parameter optimization
4Manufacturing precision
If the chromatic aberration is corrected through material selection, then the imaging quality is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent balances imaging quality and manufacturing ease by specifying achievable parameter ranges for Abbe numbers (υ2≤30.000, (υ1+υ3+υ4)≤120.000) and dimensional ratios, allowing chromatic aberration correction through material selection with reasonable manufacturing precision requirements
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 design effectively increases luminous flux and corrects chromatic aberration, ensuring good imaging quality and reducing the optical system's length, while also simplifying fabrication and enhancing fabrication yield.
Implementation Method 1
Each one of the first lens element, the second lens element, the third lens element and the fourth lens element respectively has an object-side surface which faces toward the object side to allow imaging rays to pass through as well as an image-side surface which faces toward the image side to allow the imaging rays to pass through
Implementation Method 2
The Abbe number of the first lens element is υ1, the Abbe number of the second lens element is υ2, the Abbe number of the third lens element is υ3 and the Abbe number of the fourth lens element is υ4 to satisfy υ2≤30.000 and (υ1+υ3+υ4)≤120.000
Data Source
AI summary
An optical imaging lens includes a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has positive refracting power, an optical-axis region of the object-side surface of the second lens element is convex, a periphery region of the object-side surface of the second lens element is convex, and an optical-axis region of the image-side surface of the second lens element is convex. The Abbe number of the first lens element is υ1, the Abbe number of the second lens element is υ2 and the Abbe number of the third lens element is υ3 to satisfy 61.119≤υ1+υ2+υ3≤96.733.