Four-Element Lens System with Inflection Points for Wide Field of View
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Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance between high image quality, low sensitivity, proper aperture size, miniaturization, and a desirable field of view, making it difficult to meet the increasing functionality requirements of electronic devices equipped with optical systems.
Innovation Solution
A lens system comprising four lens elements with specific surface configurations and refractive power distributions, including inflection points and convex/concave surface shapes, is designed to optimize image quality, reduce size, and enhance light converging capability, while maintaining a balance between total track length and field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lens system uses conventional optical design, then the structure is simple, but the image quality and field of view cannot be optimized simultaneously
Solution Approach 1:
The lens system is divided into four distinct lens elements, each with specific refractive power and surface curvature characteristics. This segmentation allows each element to contribute differently to the overall optical performance, enabling correction of multiple aberrations and achievement of wide field of view while maintaining manageable structural complexity
Solution Approach 2:
Each lens element is designed with specific local optical properties: the first lens element has negative refractive power with an inflection point on its object-side surface, while the fourth lens element has positive refractive power with a convex object-side surface in the paraxial region. These localized quality variations enable precise control over light propagation and aberration correction across different field regions
2Length of moving object
If the lens system is miniaturized, then the total track length is reduced, but the field of view and light converging capability are compromised
Solution Approach 1:
The lens elements are designed with dynamic surface characteristics including inflection points that allow the optical system to adapt light paths efficiently. The fourth lens element's convex object-side surface in the paraxial region dynamically focuses light while the inflection points on various surfaces adjust the field of view, achieving wide angle coverage within a compact total track length
Solution Approach 2:
The patent specifies precise parameter relationships: the fourth lens element must have positive refractive power with a convex object-side surface in the paraxial region, and specific inflection point configurations on lens surfaces. These parameter optimizations enable the system to achieve wide field of view and adequate light converging capability while maintaining miniaturized dimensions with total track length ratio TL/f within the specified range
3Power
If the aperture size is increased, then the light converging capability is improved, but the sensitivity and image quality balance is disrupted
Solution Approach 1:
The lens elements exhibit asymmetric surface configurations: the first lens element has an inflection point on its object-side surface, while the fourth lens element has a convex object-side surface in the paraxial region. This asymmetry allows the system to concentrate light effectively (improving light converging capability) while maintaining proper aperture size and preserving image quality balance through controlled sensitivity
Solution Approach 2:
The patent replaces traditional mechanical aperture control with optical design solutions. By configuring the fourth lens element with positive refractive power and a convex object-side surface in the paraxial region, the system achieves adequate light converging capability and proper aperture size control through optical means rather than mechanical adjustment, thereby maintaining image quality balance
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 lens system effectively balances image quality, size, and functionality, providing a wide field of view, correcting aberrations, and ensuring sufficient light incidence, thus meeting the requirements of modern electronic devices.
Implementation Method 1
The fourth lens element has positive refractive power, the object-side surface of the fourth lens element is convex in a paraxial region thereof
Data Source
AI summary
A lens system includes four lens elements which are, 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. Each of the four lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. At least one of the object-side surface and the image-side surface of the first lens element has at least one inflection point. The fourth lens element has positive refractive power, the object-side surface of the fourth lens element is convex in a paraxial region thereof, and at least one of the object-side surface and the image-side surface of the fourth lens element has at least one inflection point.