Five-Lens Wide-Angle Imaging Assembly with Aspheric Correction
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Solution Overview
Problem
Conventional lens structures for image display devices are bulky and lack efficiency, particularly in achieving a balance of wide-angle imaging with high resolution and compactness.
Innovation Solution
A wide-angle imaging lens assembly with five lenses, comprising a fixing diaphragm and an optical set with specific refractive powers and aspheric surfaces, arranged to optimize curvature, interval, and optical parameters, including a negative first lens, positive second and third lenses, and a concave fifth lens with a corrugated surface, to correct aberrations and reduce the lens system's length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional lens structure is used, then imaging function is provided, but volume is big and efficiency is low
Solution Approach 1:
The lens assembly is divided into five separate lens elements (first lens L1, second lens L2, third lens L3, fourth lens L4, and fifth lens L5) with specific refractive powers and surface configurations. Each lens element performs a specific optical function, allowing the system to achieve wide-angle imaging with high resolution while maintaining compact dimensions through optimized segmentation of optical tasks.
Solution Approach 2:
At least one surface of each lens element is designed as an aspheric surface rather than a simple spherical surface. The aspheric surfaces enable more precise control of light rays, correcting optical aberrations and improving imaging quality while allowing for a more compact lens configuration that reduces overall volume.
2Measurement precision
If more lenses are added to improve resolution, then imaging quality improves, but height increases
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element including refractive power signs (negative for first lens, positive for second and third, negative for fifth), aspheric surface coefficients, and spacing relationships. These parameter optimizations allow five lenses to achieve high resolution imaging while keeping the total height within acceptable limits for portable devices.
Solution Approach 2:
The five lens elements are arranged in a compact sequence from object side to image side, with each lens nested within the overall optical path. The fixing diaphragm is positioned between the first and second lenses, creating a nested configuration that maximizes optical performance within minimal height constraints.
3Adaptability or versatility
If wide-angle imaging is achieved, then field of view increases, but optical aberrations increase
Solution Approach 1:
The aspheric surfaces on the lens elements provide superior aberration correction compared to spherical surfaces. The varying curvature of aspheric surfaces enables precise control of marginal and paraxial rays, correcting spherical aberration, coma, and astigmatism that typically increase with wider field of view, thereby maintaining high image quality across the entire image-capture angle.
Solution Approach 2:
Different lens elements are assigned specific refractive powers and surface configurations tailored to their positions in the optical path. The first lens with negative power and convex object-side surface addresses field curvature, while subsequent lenses with positive powers correct various aberrations locally, enabling wide-angle imaging with minimized overall aberration.
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 wide-angle imaging lens assembly with a shorter height, high resolution, and improved optical performance, correcting spherical and astigmatic aberrations while enabling ultra-wide-angle image capture with a larger image-capture angle over 85°, suitable for compact portable devices.
Implementation Method 1
the first lens with a negative refractive power and a convex surface directed toward the object side, at least one surface of the first lens is aspheric; the second lens with a positive refractive power and a convex surface directed toward the image side, at least one surface of the second lens is aspheric
Data Source
AI summary
An imaging lens assembly comprises a fixing diaphragm and an optical set including five lenses. An arranging order from an object side to an image side is: a first lens; the fixing diaphragm; a second lens; a third lens; a fourth lens; and a fifth lens. At least one surface of the five lenses is aspheric. By the concatenation between the lenses and the adapted curvature radius, thickness/interval, refractivity, and Abbe numbers, the assembly attains a big diaphragm with wide-angle, a shorter height, and a better optical aberration.