Four-Element Optical Lens Abbe Number Optimization
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Solution Overview
Problem
Conventional optical imaging lenses for portable electronic devices face challenges in achieving high imaging quality and small size while maintaining a sufficient field of view and aperture, due to the complexity of lens design and fabrication issues.
Innovation Solution
A four-lens element optical imaging lens system with specific refracting power distributions and surface shapes, including concave and convex regions on the lens elements, is designed to optimize imaging quality and reduce size, with constraints on Abbe numbers and air gaps to ensure effective aberration correction and assembly yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the optical imaging lens is scaled down to reduce size, then the lens length is reduced, but the imaging quality deteriorates due to fabrication difficulties and design complexity
Solution Approach 1:
The patent applies parameter changes by optimizing the Abbe numbers of the four lens elements to satisfy υ1+υ2+υ3+υ4≤150.000, and by controlling the ratio of air gaps to lens thicknesses. These parameter optimizations enable the lens to achieve good imaging quality while maintaining a compact form factor, resolving the contradiction between size reduction and manufacturing precision.
Solution Approach 2:
The patent employs local quality by designing specific surface shapes for different regions of the lens elements. The object-side surface of the second lens element has a concave periphery region, and the object-side surface of the third lens element has a concave optical-axis region. These localized surface modifications correct aberrations in specific areas, improving overall imaging quality without requiring a larger lens system.
2Length of moving object
If the optical imaging lens is scaled down to reduce size, then the lens length is reduced, but the field of view deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the optical system into four distinct lens elements with specific refracting power distributions. The first lens element has negative refracting power while the second, third, and fourth elements have positive refracting power. This segmentation allows each element to contribute differently to the overall optical performance, enabling a compact design that maintains an adequate field of view.
Solution Approach 2:
The patent controls the field of view by optimizing the ratio of the sum of air gaps to the sum of lens thicknesses, satisfying (G12+G23+G34)/(T1+T2+T3+T4)≥0.600. This parameter optimization ensures that sufficient optical path length is maintained within the compact form factor, preserving the field of view despite the reduced overall lens length.
3Length of moving object
If the optical imaging lens is scaled down to reduce size, then the lens length is reduced, but the aperture stop deteriorates
Solution Approach 1:
The patent maintains the aperture stop by controlling the f-number through optimized parameter relationships. By satisfying (G12+G23+G34)/(T1+T2+T3+T4)≥0.600 and υ1+υ2+υ3+υ4≤150.000, the design ensures adequate light-gathering capability is preserved even in the compact form factor, resolving the contradiction between size reduction and aperture performance.
4Length of moving object
If the optical imaging lens is scaled down to reduce size, then the lens length is reduced, but the device complexity increases due to fabrication and assembly issues
Solution Approach 1:
The patent reduces device complexity by establishing clear parameter constraints that guide fabrication and assembly. The conditions υ1+υ2+υ3+υ4≤150.000 and (G12+G23+G34)/(T1+T2+T3+T4)≥0.600 provide quantitative guidelines that simplify the design-to-manufacturing transition, making the compact lens system easier to fabricate and assemble while maintaining performance.
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 achieves reduced optical imaging lens length, enhanced field of view, maintained or improved f-number, and superior optical performance, while facilitating easier fabrication and assembly, thereby addressing the limitations of existing designs.
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
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 negative refracting power, the periphery region of the object-side surface of the second lens element is concave and the optical-axis region of the object-side surface of the third lens element is concave. 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 υ1+υ2+υ3+υ4≤150.000.