Five-Element Image Lens Assembly for Compact Imaging
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Solution Overview
Problem
Conventional optical lens assemblies face challenges in balancing image quality, sensitivity, aperture size, volume, and field of view, making it difficult to meet the increasing demands for compact and high-performance imaging in electronic devices.
Innovation Solution
An image lens assembly comprising five lens elements with specific refractive powers and surface configurations, including positive and negative refractive powers, convex and concave surfaces, and critical points, optimized by conditions such as Abbe numbers, focal lengths, and axial distances to achieve compactness, high image quality, and wide field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional optical lens assembly is used, then the structure is simple, but it is hard to balance among image quality, sensitivity, aperture size, volume or field of view
Solution Approach 1:
The lens assembly is divided into five distinct lens elements (first lens element with positive refractive power, second lens element with negative refractive power, third lens element with positive refractive power, fourth lens element with positive refractive power, and fifth lens element with negative refractive power). Each lens element is designed with specific refractive powers and surface configurations to independently contribute to correcting different types of optical aberrations, enabling the system to balance image quality, sensitivity, aperture size, volume, and field of view simultaneously.
Solution Approach 2:
Different regions of the lens assembly are assigned different optical properties. The first lens element has positive refractive power for overall convergence, the second lens element has negative refractive power for aberration correction, the third lens element has positive refractive power for additional convergence, the fourth lens element has positive refractive power with specific surface curvature for precision control, and the fifth lens element has negative refractive power for final aberration correction. This localized optimization of optical properties enables the system to achieve multiple performance goals simultaneously.
2Measurement precision
If the pixel size is reduced to enhance image sensor performance, then sensitivity is improved, but the optical lens assembly becomes more difficult to design with high image quality
Solution Approach 1:
The lens assembly uses precisely controlled optical parameters including refractive indices (e.g., the second lens element has refractive index n2 and the third lens element has refractive index n3), Abbe numbers (V2 and V3 for the second and third lens elements respectively), curvature radii (R7 for the object-side surface of the fourth lens element and R8 for the image-side surface), and axial distances (T12 between first and second lens elements, T23 between second and third lens elements). These parameters are optimized to work with smaller pixel sizes while maintaining high image quality through enhanced 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
The solution enables a compact optical lens assembly that balances image quality, sensitivity, and field of view, enhancing the performance of electronic devices by correcting aberrations and optimizing refractive power distribution, thus meeting the demands for modern imaging applications.
Implementation Method 1
The first lens element has positive refractive power. The third lens element has negative refractive power. The fourth lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof.
Data Source
AI summary
An image lens assembly includes five lens elements, which are, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element has positive refractive power. The third lens element has negative refractive power. The fourth lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The fifth lens element has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The image-side surface of the fifth lens element includes at least one convex critical point in an off-axis region thereof.