Seven-Lens Optical Imaging Assembly for Distortion Correction
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Solution Overview
Problem
Traditional optical lens assemblies fail to effectively correct distortion caused by the linear relationship between image height and half field-of-view, and they lack temperature adaptability, making it difficult to achieve both good image quality and miniaturization while maintaining off-axis image quality.
Innovation Solution
An optical imaging lens assembly comprising seven lenses, with specific refractive powers and surface shapes, is designed to address these issues by optimizing the configuration of refractive power, surface shape, center thickness, and spaced intervals between lenses, including the use of aspheric lenses to improve image quality and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional optical lens assembly is used, then the structure is simple, but the distortion correction is insufficient and temperature adaptability is poor
Solution Approach 1:
The lens assembly is divided into seven individual lenses with specific refractive powers arranged sequentially along the optical axis. Each lens (first lens with negative refractive power, second lens with negative refractive power, third lens with positive refractive power, fourth lens with positive refractive power, fifth lens with refractive power, sixth lens with refractive power, and seventh lens with negative refractive power) is designed to contribute specifically to distortion correction, allowing precise control over optical performance while maintaining modular simplicity.
Solution Approach 2:
The patent optimizes multiple parameters including the refractive power of each lens, the radius of curvature of lens surfaces, the center thickness of each lens, and the spaced intervals between adjacent lenses. These parameter optimizations enable the lens assembly to achieve superior distortion correction and temperature adaptability while controlling overall complexity through systematic design.
2Manufacturing precision
If plastic aspheric lenses are employed, then the imaging quality is improved, but the temperature adaptability deteriorates
Solution Approach 1:
The lens assembly incorporates aspheric lenses at specific positions where they provide the most benefit for imaging quality correction. The combination of aspheric and spherical lens surfaces allows different regions of the optical system to serve different functions: aspheric surfaces correct off-axis aberrations and improve imaging quality, while the overall lens configuration and spacing are optimized to maintain temperature adaptability across the entire system.
3Area of stationary object
If wide-angle lens assembly is designed, then the field of view is expanded, but the off-axis image quality and module miniaturization are compromised
Solution Approach 1:
The lens assembly utilizes curved surfaces including aspheric and spherical lens surfaces to control light paths and correct aberrations. The specific curvature radii of each lens surface are optimized to enable wide-angle field of view while maintaining sharp off-axis image quality. The concave and convex surfaces are strategically positioned to manage ray angles and minimize distortion across the entire field of view.
Solution Approach 2:
The patent addresses miniaturization by optimizing the third dimension (depth along the optical axis) through precise control of lens spacing and thickness. The spaced intervals between adjacent lenses and the center thickness of each lens are optimized to achieve compact module size while maintaining wide-angle capabilities and high off-axis image quality through multi-dimensional parameter optimization.
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 miniaturization, wide-angle capabilities, and high image quality while ensuring good off-axis imaging performance and temperature adaptability, effectively addressing the limitations of traditional lens assemblies.
Implementation Method 1
The first lens may have negative refractive power; the second lens may have negative refractive power; the third lens may have positive refractive power; the fourth lens may have positive refractive power; the fifth lens has refractive power; the sixth lens has refractive power; and the seventh lens may have negative refractive power
Data Source
AI summary
The present disclosure discloses an optical imaging lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has negative refractive power; the second lens has negative refractive power; the third lens has positive refractive power; the fourth lens has positive refractive power; the fifth lens has refractive power, and an object-side surface thereof is a concave surface; the sixth lens has refractive power; and the seventh lens has negative refractive power. An effective focal length f1 of the first lens and a total effective focal length f of the optical imaging lens assembly satisfy −3.5<f1/f<0.