Wide-Angle Lens System Using Aspheric Surfaces to Reduce Distortion
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Solution Overview
Problem
Existing wide-angle image taking lens systems for mobile devices suffer from large distortion, limited field of view, and excessive length due to the number of lens elements required for high image quality.
Innovation Solution
A miniaturized wide-angle image taking lens system with five lens elements, including a specific arrangement of aspheric surfaces and materials, optimized to reduce chromatic aberration, increase field of view, and minimize total track length, using plastic and glass materials to distribute refractive power effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If five to six lens elements are used to provide wider angle of view, then the field of view is improved, but the distortion increases and the total track length becomes too long
Solution Approach 1:
The patent applies aspheric surfaces to the lens elements, changing the geometric parameters from spherical to aspheric. This allows for wider angle of view while correcting distortion by varying the curvature across the lens surface, enabling better control of light rays at different angles without requiring additional lens elements.
Solution Approach 2:
The patent combines plastic and glass materials in the lens elements to achieve optimal optical performance. Plastic aspheric surfaces provide distortion correction and wide angle capability, while glass elements contribute to chromatic aberration control, creating a composite optical system that resolves multiple contradictions simultaneously.
2Adaptability or versatility
If five to six lens elements are used to provide wider angle of view, then the field of view is improved, but the total track length becomes too long
Solution Approach 1:
The aspheric surfaces enable the lens elements to achieve wider angle of view with reduced optical path length. The varying curvature allows for more efficient light bending, shortening the total track length while maintaining or expanding the field of view capability.
Solution Approach 2:
The patent uses aspheric (non-spherical) surfaces instead of traditional spherical surfaces. This curvature variation allows for compact lens design with shorter track length, as the aspheric profiles can focus light more efficiently and reduce the distance required between lens elements and the image sensor.
3Manufacturing precision
If multiple lens elements are used to achieve high image quality, then the resolution is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent strategically combines plastic and glass materials to balance manufacturing cost and image quality. Plastic aspheric elements provide cost-effective distortion correction, while fewer glass elements handle chromatic aberration, reducing overall manufacturing complexity while maintaining high image quality through material 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 system achieves a wide field of view with high resolution and reduced distortion, while minimizing the total track length and cost, making it suitable for electronic imaging systems.
Implementation Method 1
a first lens element with a negative refractive power having an aspheric object-side surface and an aspheric image-side surface
Implementation Method 2
the focal length of the wide-angle image taking lens system is f, the focal length of the second lens element is f2
Data Source
AI summary
A wide-angle image taking lens system includes an aperture stop and an optical assembly including: in order from an object side to an image side: first, second, third, fourth and fifth lens elements, the system has a total of five lens elements with refractive power, wherein Abbe numbers of the first and fifth lens element are V1, V5, a distance along an optical axis between the first and second lens element is T12, a central thickness of the first lens element is CT1, focal lengths of the system, second and third lens elements are f, f2, f3, maximum effective diameters of an object-side surface of the first lens element and an image-side surface of the fifth lens element are CA11, CA52, satisfying: 1.5<V1/V5<3; 1.1<T12/CT1<2.5; 0.2<|f/f3|+|f/f2|<1.5; 0.2<CA11/CA52<0.5.