Wide-Angle Lens Assembly Aberration Control via Aspheric Inflection
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Solution Overview
Problem
Conventional optical systems in vehicle photographing devices have poor resolving power, severe peripheral distortion, and cannot effectively balance refractive power distribution, leading to high-order aberrations and low peripheral illumination, which compromises image quality.
Innovation Solution
A wide-angle image capturing lens assembly with a four-element structure, comprising a first lens element with negative refractive power, a second lens element with positive refractive power, a third lens element with positive refractive power, and a fourth lens element with aspheric surfaces and inflection points, arranged to balance refractive powers and reduce aberrations, while maintaining a larger field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical systems are used in vehicle photographing devices, then the structure is simple, but the resolving power is poor and peripheral distortion is severe
Solution Approach 1:
The optical system is divided into four separate lens elements with different refractive powers and surface shapes. Each lens element is optimized for specific aberration correction, allowing the system to achieve high resolving power through coordinated action of multiple segmented components rather than a single complex element.
Solution Approach 2:
The patent employs asymmetric surface designs including convex and concave surfaces with different curvature radii on each lens element. The aspheric surfaces with inflection points create asymmetric light path control that effectively reduces peripheral distortion while maintaining central image quality, resolving the contradiction between simplicity and performance.
2Measurement precision
If the refractive power distribution is not balanced in the optical system, then the structure is simple, but high-order aberrations cannot be effectively reduced
Solution Approach 1:
Each lens element is designed with specific local optical properties: the first element has negative refractive power for field expansion, the second has positive power for focal convergence, the third has positive power with specific curvature for aberration balancing, and the fourth has aspheric surfaces for high-order aberration correction. This localized optimization of quality in each element achieves comprehensive aberration control.
Solution Approach 2:
The patent systematically varies critical parameters including refractive power signs, surface curvature radii, and aspheric coefficients across the four lens elements. By changing these parameters in a coordinated manner, the system achieves balanced refractive power distribution that reduces high-order aberrations while maintaining a manageable structural complexity.
3Adaptability or versatility
If a larger field of view is provided by the optical system, then the wide-angle capability is improved, but excessively low peripheral illumination is caused
Solution Approach 1:
The patent utilizes curved surfaces including convex and concave surfaces with optimized curvature radii on each lens element. The aspheric surfaces with inflection points provide progressive curvature changes that redirect light rays to achieve uniform illumination across the wide field of view, preventing the exponential falloff typical in conventional wide-angle systems.
Solution Approach 2:
The patent addresses the illumination problem by introducing aspheric surfaces with inflection points, which add a dimensional complexity to the surface geometry. This allows control of light paths in multiple spatial dimensions simultaneously, enabling both wide field of view and uniform peripheral illumination to be achieved together.
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 enhances image quality by reducing high-order aberrations, improving peripheral illumination, and maintaining a larger field of view, effectively addressing the limitations of conventional systems.
Implementation Method 1
a first lens element (110) with negative refractive power, a second lens element (120) with positive refractive power, a third lens element (130) with positive refractive power, and a fourth lens element (140) with refractive power
Data Source
AI summary
A wide-angle image capturing 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 and a fourth lens element. The first lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The second lens element with refractive power has an image-side surface being convex in a paraxial region thereof. The third lens element has positive refractive power. The fourth lens element with refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The object-side surface and the image-side surface of the fourth lens element are aspheric. At least one of the object-side surface and the image-side surface of the fourth lens element has at least one inflection point in an off-axis region thereof.