Five-Lens Imaging System Aberration Correction
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Solution Overview
Problem
Existing imaging lens systems for high pixel density image pickup devices face challenges in miniaturization, optical performance, and manufacturing ease, particularly due to inadequate aberration correction and high assembly sensitivity.
Innovation Solution
The proposed imaging lens system consists of five sequentially disposed lenses with specific refractive powers and shapes, including a convex first lens, concave second lens, positive third lens, concave fourth lens, and concave fifth lens, made of plastic material, with an aperture stop between the first and second lenses, satisfying specific focal length and Abbe number conditions to reduce aberrations and improve manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to achieve high pixel density and miniaturization, then the resolution and pixel density are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The imaging lens system divides the optical function into five distinct lens elements (first lens L1, second lens L2, third lens L3, fourth lens L4, and fifth lens L5), each with specific refractive powers and shape characteristics. This segmentation allows each lens to contribute to correcting specific aberrations while maintaining overall high resolution for high pixel density image pickup devices
Solution Approach 2:
Each lens element is designed with specific local properties: the first lens has a convex object side surface, the second and fourth lenses have meniscus shapes concave toward specific sides, and the fifth lens has a meniscus shape concave toward the image side near the optical axis. These localized quality variations enable targeted aberration correction while maintaining system compactness
2Length of stationary object
If existing lens designs are used for miniaturization, then the device size is reduced, but the assembly sensitivity increases
Solution Approach 1:
The patent establishes specific parameter ranges for the lens system, including focal length ratios (−524f34/f5 and −14f5/f4), refractive power distributions, and shape characteristics. These parameter constraints are optimized to reduce assembly sensitivity while maintaining miniaturization, ensuring that the lens system can be manufactured with high precision and low sensitivity to assembly variations
3Measurement precision
If existing lens designs are used for high pixel density, then the pixel density is improved, but the aberration correction becomes inadequate
Solution Approach 1:
The imaging lens system employs a composite configuration of five lens elements with different refractive powers and material properties. The combination of positive and negative refractive power lenses (first lens with positive power, second and fourth lenses with negative power, third and fifth lenses with positive power) creates a composite optical system that effectively corrects various aberrations while supporting high pixel density applications
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 a thin, high-resolution imaging lens system with reduced aberrations, low assembly sensitivity, and cost-effective manufacturing, suitable for high pixel density image pickup devices.
Implementation Method 1
The first lens has a positive refractive power and an object side lens surface that is convex toward the object side. The second lens has a negative refractive power and a meniscus shape that is concave toward the image side.
Data Source
AI summary
An imaging lens system includes a first lens to a fifth lens sequentially disposed from an object side to an image side. The first lens has a positive refractive power and an object side lens surface that is convex toward the object side. The second lens has a negative refractive power and a meniscus shape that is concave toward the image side. The third lens has a positive refractive power. The fourth lens has a negative refractive power and a meniscus shape that is concave toward the object side. The fifth lens has a negative refractive power and a meniscus shape that is concave toward the image side near an optical axis. The imaging lens system satisfies the following condition: f34/f<−5, where f denotes a focal length of the imaging lens system, and f34 denotes an effective focal length of the third lens and the fourth lens.