Four-Element Imaging Lens for Wide-Field Aberration Correction
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Solution Overview
Problem
Conventional imaging lenses struggle to achieve a wide field of view while maintaining high resolution and effectively correcting aberrations, particularly in peripheral areas.
Innovation Solution
The imaging lens configuration comprises a first lens with negative refractive power, a second lens with positive or negative refractive power and a concave object-side surface, a third lens with biconvex shape, and a fourth lens with a convex image-side surface, adhering to specific conditional expressions to optimize aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a conventional imaging lens configuration is used to achieve a wide field of view, then the field of view is widened, but aberrations at the peripheral area cannot be corrected and optical performance deteriorates
Solution Approach 1:
The imaging lens is divided into four separate lenses with specific refractive powers and shapes. Each lens is designed to perform specific functions: the first lens provides negative refractive power for wide field of view, the second lens corrects distortion and field curvature, the third lens corrects spherical aberration and astigmatism, and the fourth lens corrects coma aberration and controls light ray incident angles. This segmentation allows each lens to be optimized for its specific function while working together to achieve both wide field of view and high aberration correction.
Solution Approach 2:
Each lens in the system is designed with specific local characteristics - the first lens has negative refractive power concentrated in its structure, the second lens has a concave object-side surface for distortion correction, the third lens has a biconvex shape for spherical aberration correction, and the fourth lens has a convex image-side surface for coma aberration correction. This local quality differentiation allows each lens to address specific aberration problems in specific regions of the image field.
2Volume of moving object
If the lens diameter is reduced to achieve compact size, then the lens profile is reduced, but aberration correction becomes more difficult
Solution Approach 1:
The aberration correction function is segmented across four different lenses rather than relying on a single large lens. Each lens handles specific aberration types through its designed refractive power and shape characteristics, allowing the system to achieve compact size while maintaining correction capability through distributed optical functions.
Solution Approach 2:
The imaging lens uses a composite structure of four different lens elements with different refractive indices and shapes. This composite approach allows the system to achieve both compact size and high aberration correction by combining the advantages of different lens types in a unified optical system.
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 lens design achieves a wide field of view with high resolution and proper correction of aberrations such as coma, astigmatism, field curvature, and distortion, allowing for reduced lens diameter and cost-effective manufacturing.
Implementation Method 1
a first lens with negative refractive power in a paraxial region
Implementation Method 2
a second lens with positive or negative refractive power having an object-side surface being concave in a paraxial region
Implementation Method 3
a third lens with positive refractive power having a biconvex shape with convex surfaces on the object side and the image side in a paraxial region
Implementation Method 4
a fourth lens with positive refractive power having an image-side surface being convex in a paraxial region
Data Source
AI summary
There is provided an imaging lens with excellent optical characteristics while satisfying demand of wide field of view. An imaging lens comprises, in order from an object side to an image side, a first lens with negative refractive power in a paraxial region, a second lens with positive or negative refractive power having an object-side surface being concave in a paraxial region, a third lens with positive refractive power having a biconvex shape with convex surfaces on the object side and the image side in a paraxial region, and a fourth lens with positive refractive power having an image-side surface being convex in a paraxial region, and predetermined conditional expressions are satisfied.