Four-Lens Imaging System for Wide-Angle Aberration Correction
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Solution Overview
Problem
Conventional imaging lenses for portable devices face challenges in achieving a wide angle of view while maintaining miniaturization and satisfactory aberration correction, particularly as the resolution of imaging elements increases, leading to difficulties in correcting chromatic aberrations, astigmatism, and distortion.
Innovation Solution
The imaging lens configuration consists of a first lens with negative refractive power, a second lens with positive refractive power, a third lens with negative refractive power, and a fourth lens with positive refractive power, arranged from the object side to the image plane side, with specific curvature radius relationships and focal length ratios that satisfy certain conditional expressions to ensure miniaturization and effective aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a two-lens or three-lens configuration is used, then miniaturization is achieved, but aberration correction becomes insufficient as imaging element resolution increases
Solution Approach 1:
The imaging lens is divided into four separate lens elements arranged in sequence from the object side: a first lens with negative refractive power, a second lens with positive refractive power, a third lens with negative refractive power, and a fourth lens with positive refractive power. This segmentation into multiple functional elements enables comprehensive aberration correction while maintaining a compact overall structure suitable for portable devices.
2Area of moving object
If the angle of view is widened for video calls and self portraits, then imaging range is improved, but aberration correction becomes more difficult
Solution Approach 1:
Each lens element is designed with specific local optical properties: the first lens has negative refractive power to widen the angle of view, the second lens has positive refractive power to correct certain aberrations, the third lens has negative refractive power to control ray angles, and the fourth lens has positive refractive power to correct remaining aberrations. This localized optimization of each element's properties enables both wide-angle performance and satisfactory aberration correction.
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 allows for a wider angle of view while satisfactorily correcting chromatic aberrations, astigmatism, and distortion, ensuring high image-forming performance and miniaturization, even in small-sized cameras and portable devices.
Implementation Method 1
a first lens having negative refractive power
Implementation Method 2
a second lens having positive refractive power
Implementation Method 3
a third lens having negative refractive power
Implementation Method 4
a fourth lens having positive refractive power
Data Source
AI summary
An imaging lens includes a first lens and a third lens having negative refractive power, and a second lens and a fourth lens having positive refractive power. Curvature radiuses of surfaces of the first lens on an object side and an image plane side are positive. A curvature radius of a surface of the second lens on the object side is positive. Curvature radiuses of surfaces of the third lens on the object side and the image plane side are negative. Curvature radiuses of surfaces of the fourth lens on the object side and the image plane side are positive. The first lens has a focal length f1 and the second lens has a focal length f2, so that the following conditional expression is satisfied:−0.6<f2/f1<−0.1.