Wide-Angle Lens Assembly Aberration Correction
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Solution Overview
Problem
Conventional wide-angle optical lens systems for mobile electronic devices face challenges in achieving high image quality due to insufficient field of view and aberration correction, particularly with five-element lens structures that fail to efficiently correct wide-angle aberrations and suffer from insufficient brightness.
Innovation Solution
A wide-angle optical lens assembly comprising a front lens group with a negative first lens element and a rear lens group with positive refractive power elements, including aspheric surfaces and inflection points, is designed to optimize refractive power distribution and reduce total track length, incorporating a stop between the lens elements to enhance light collection and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a five-element lens structure is used, then the lens system can be made more compact, but the field of view becomes insufficient and aberration correction is inadequate
Solution Approach 1:
The lens assembly is divided into six distinct lens elements with specific positive and negative refractive powers, arranged in a front group and rear group separated by a stop. This segmentation allows each element to contribute differently to aberration correction and field of view expansion, resolving the contradiction between compact size and wide-angle performance
Solution Approach 2:
Different lens elements are assigned specific surface configurations (concave/convex object-side and image-side surfaces) and refractive powers to address local optical requirements. The aspheric surfaces on specific elements provide localized aberration correction, enabling the compact six-element design to achieve both small size and wide field of view
2Device complexity
If a five-element lens structure is used, then the lens system can be simplified, but aberration correction efficiency is insufficient
Solution Approach 1:
The optical system is segmented into six lens elements with alternating positive and negative refractive powers, allowing distributed aberration correction across multiple elements. This segmentation enables comprehensive correction of wide-angle aberrations while maintaining a relatively simple overall structure
Solution Approach 2:
Aspheric surfaces are implemented on specific lens elements (object-side surface of second element, image-side surface of fifth element, and both surfaces of sixth element) to provide superior aberration correction compared to spherical surfaces, enhancing manufacturing precision without significantly increasing complexity
3Device complexity
If conventional lens designs are used, then the structure is simple, but the surrounding image brightness is insufficient
Solution Approach 1:
The stop is positioned between the front and rear lens groups to locally control light distribution. This placement optimizes the path of oblique rays, ensuring uniform illumination across the entire image plane including surrounding areas, while maintaining a simple six-element lens structure
Solution Approach 2:
Aspheric surfaces on specific lens elements are designed to correct off-axis ray paths, improving the brightness and quality of surrounding image areas. This allows the simple lens structure to achieve uniform illumination without complex additional components
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 effectively enlarges the field of view, corrects aberrations, and improves image quality by adjusting refractive power distributions and surface curvatures, resulting in a compact lens system with enhanced image capture capabilities for electronic devices.
Implementation Method 1
The first lens element with negative refractive power has a concave image-side surface. The second lens element with refractive power has a concave object-side surface and a convex image-side surface. The object-side surface and an image-side surface of the sixth lens element are both aspheric.
Implementation Method 2
The wide-angle optical lens assembly further includes a stop disposed between the first lens element and the sixth lens element
Data Source
AI summary
A wide-angle 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, a fifth lens element, and a sixth lens element. The first lens element with negative refractive power has a concave image-side surface. The second lens element with refractive power has a concave object-side surface and a convex image-side surface. The third lens element has positive refractive power. The fourth lens element has positive refractive power. The fifth lens element with refractive power has an object-side surface and an image-side surface which both are aspheric. The sixth lens element with refractive power has a convex object-side surface, wherein the object-side surface and an image-side surface thereof are both aspheric. At least one of the second lens element and the fifth lens element has at least one inflection point.