Three-Lens Optical System for Wide Field of View
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Solution Overview
Problem
Existing optical lens systems with wide field of view either suffer from increased distortion or excessive length, making them unsuitable for miniaturized electronic devices like digital cameras and mobile phones.
Innovation Solution
A three-piece optical lens system comprising a first positive refractive power lens element with aspheric surfaces, a second negative refractive power lens element with aspheric surfaces, and a third positive refractive power lens element with an inflection point, optimized by specific focal length and thickness ratios to achieve a wide field of view with reduced aberration and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lens angle is increased to obtain a wider field of view, then the field of view is improved, but the aberration increases and the lens design becomes more complex
Solution Approach 1:
The lens system is divided into three distinct lens elements with different refractive powers and surface characteristics. The first lens element has positive refractive power with aspheric surfaces, the second has negative refractive power with aspheric surfaces, and the third has positive refractive power with at least one inflection point. This segmentation allows each element to be optimized for specific aberration correction while achieving wide field of view.
Solution Approach 2:
The patent employs aspheric surfaces on the first and second lens elements, and includes at least one inflection point on the third lens element. These curved and inflected surfaces are designed to correct optical aberrations while maintaining a compact lens structure, resolving the contradiction between wide field of view and design complexity.
2Adaptability or versatility
If two lens groups and 5-6 pieces of lens elements are used to obtain wide field of view, then the field of view is improved, but the distortion increases
Solution Approach 1:
Each lens element is designed with specific local characteristics: the first lens element has aspheric surfaces for aberration correction, the second has aspheric surfaces for distortion control, and the third has inflection points for field curvature management. This local quality differentiation allows the system to achieve wide field of view with reduced distortion.
3Adaptability or versatility
If wide field of view is achieved with existing lens systems, then the field of view is improved, but the total length becomes too long
Solution Approach 1:
The patent utilizes inflection points on the third lens element to control optical field curvature and manage the light path in a compact configuration. This dimensional approach to surface geometry allows the lens system to achieve wide field of view while maintaining a short total length, overcoming the conventional trade-off.
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 provides a wide field of view with improved resolution and reduced distortion, suitable for miniaturized electronic devices, while maintaining a compact design.
Implementation Method 1
a first lens element with a positive refractive power having an object-side surface being convex near an optical axis and an image-side surface being convex near the optical axis
Data Source
AI summary
An optical lens system with a wide field of view includes, in order from the object side to the image side: a stop, a first lens element with a positive refractive power, a second lens element with a negative refractive power, and a third lens element with a positive refractive power. A focal length of the first lens element and the second lens element combined is f12, a focal length of the third lens element is f3, and they satisfy the relation: 0.3<f12/f3<0.9, so that the optical lens system has a wide field of view, high resolution, short length and less distortion.