Five-Element Optical Lens Assembly for Low-Light Image Capture
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Solution Overview
Problem
Conventional optical lens assemblies for electronic devices, such as those used in camera applications, often have smaller apertures and insufficient resolution for low light environments, or larger apertures with inadequate light convergence, making them unsuitable for applications requiring both high resolution and effective low-light performance.
Innovation Solution
An image capturing optical lens assembly comprising five lens elements with specific refractive powers and surface configurations, including a first lens with negative power, a third lens with convex surfaces, and a fourth lens with positive power, optimized for a wide field of view and improved light convergence, while maintaining balanced refractive power distribution and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional optical lens assemblies use smaller apertures, then device complexity is reduced, but light capture capability and resolution in low light environments deteriorate
Solution Approach 1:
The optical lens assembly is divided into five separate lens elements with different refractive powers and surface configurations. This segmentation allows each lens element to be optimized for specific functions: the first lens element with negative refractive power and concave image-side surface controls aberrations, the second lens element with positive refractive power provides light convergence, the third lens element with convex image-side surface corrects distortion, the fourth lens element with positive refractive power enhances focus, and the fifth lens element with concave object-side surface reduces spherical aberration. This segmented approach enables large aperture while maintaining manageable complexity through modular design.
Solution Approach 2:
Different regions of the lens assembly have different optical properties tailored to specific functions. The first lens element has negative refractive power with concave image-side surface for aberration control, while the second lens element has positive refractive power for light convergence. The third lens element has convex image-side surface for distortion correction, the fourth lens element has positive refractive power for enhanced focus, and the fifth lens element has concave object-side surface for spherical aberration reduction. Each lens element's specific optical characteristics are optimized for its local function within the overall system.
2Illumination intensity
If conventional optical lens assemblies use larger apertures, then light capture capability improves, but resolution power and image quality deteriorate
Solution Approach 1:
The five-lens element structure segments the optical path to address different quality parameters at different stages. The first lens element controls aberrations early in the path, the second provides light convergence, the third corrects distortion, the fourth enhances focus, and the fifth reduces spherical aberration. This segmentation enables the system to achieve both large aperture for light capture and high resolution by distributing quality optimization across multiple elements.
Solution Approach 2:
The lens assembly utilizes specific refractive power parameters and surface curvature parameters to optimize performance. The first lens element has negative refractive power with concave image-side surface, the second has positive refractive power, the third has convex image-side surface, the fourth has positive refractive power, and the fifth has concave object-side surface. These parameter changes across different lens elements enable simultaneous optimization of light capture and resolution by adjusting optical characteristics at each stage of light transmission.
3Illumination intensity
If the optical lens assembly has large aperture, then light capture in low light environments improves, but aberration correction and image quality deteriorate
Solution Approach 1:
Aberration correction is segmented across multiple lens elements, with each element addressing specific types of aberrations. The first lens element with negative refractive power and concave image-side surface controls general aberrations, the third lens element with convex image-side surface corrects distortion, and the fifth lens element with concave object-side surface reduces spherical aberration. This segmentation of correction functions enables large aperture while maintaining image quality through distributed aberration management.
Solution Approach 2:
Each lens element has locally optimized optical characteristics tailored to correct specific aberrations. The first lens element's negative refractive power and concave surface are optimized for aberration control, the third lens element's convex surface is optimized for distortion correction, and the fifth lens element's concave surface is optimized for spherical aberration reduction. This local optimization enables comprehensive aberration correction across the entire field of view while maintaining large aperture.
4Measurement precision
If the optical lens assembly uses five lens elements with specific configurations, then image quality and light capture improve, but device complexity increases
Solution Approach 1:
The optical system is segmented into five functional lens elements, each performing a specific role in image quality optimization. This segmentation, while increasing element count, distributes complexity across modular components that can be manufactured and assembled independently. The first lens element handles aberration control, the second provides light convergence, the third corrects distortion, the fourth enhances focus, and the fifth reduces spherical aberration, with each segment contributing to overall performance.
Solution Approach 2:
The specific configurations of the five lens elements use optimized refractive power parameters and surface curvature parameters to achieve high image quality. The negative refractive power of the first element, positive refractive power of the second, convex surface of the third, positive refractive power of the fourth, and concave surface of the fifth are all specifically tuned parameters that balance performance benefits against manufacturing complexity.
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 provides enhanced image quality and light capture capabilities, especially in low-light conditions, with a large aperture and high resolution, suitable for applications like infrared imaging and night vision, while maintaining a compact size and reducing manufacturing sensitivity.
Implementation Method 1
an image capturing optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element
Data Source
AI summary
An image capturing optical lens assembly includes, in order from an object side to an image side, 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 negative refractive power. The second lens element has an object-side surface being convex. The fourth lens element has an image-side surface being convex. The fifth lens element has negative refractive power. A total number of the lens elements in the image capturing optical lens assembly is five.