Five-Element Lens System Compact Mobile Imaging
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Solution Overview
Problem
Conventional compact photographing systems for mobile electronic products face challenges in achieving high image quality while maintaining a compact size due to the limitations of the four-element lens structure, which restricts the total track length and increases the outer diameters of lens elements.
Innovation Solution
A five-element lens system is proposed, comprising a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power and convex surfaces, a fourth lens with negative refractive power and aspheric surfaces, and a fifth lens with refractive power and inflection points, optimizing the Abbe numbers and surface curvatures to reduce the total track length and enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a four-element lens structure is used, then the total track length is reduced, but the image quality and resolution cannot satisfy high megapixel requirements
Solution Approach 1:
The lens system is divided into five distinct lens elements with specific refractive power distributions (positive, negative, positive, negative, positive). Each element is optimized for specific aberration correction, allowing high image quality to be achieved while maintaining a compact total track length suitable for mobile devices.
Solution Approach 2:
Different lens elements are assigned specific local functions: the first element for overall focusing, the second for correcting spherical aberration, the third for coma correction, the fourth for astigmatism correction, and the fifth for field curvature correction. This localized optimization of each element's properties achieves high overall image quality.
2Manufacturing precision
If a fifth-element lens structure is used to enhance image quality, then the outer diameters of lens elements and total track length increase
Solution Approach 1:
The patent optimizes specific parameters of the fifth lens element, including its refractive power, curvature radii, and thickness, to achieve effective aberration correction without significantly increasing the total track length. The fifth element's parameters are carefully selected to complement the previous four elements.
Solution Approach 2:
The five lens elements are arranged in a nested configuration where each subsequent element is positioned to work with the previous ones, maximizing the use of available optical space and minimizing the overall track length while maintaining high image quality.
3Manufacturing precision
If a fifth-element lens structure is used to enhance image quality, then the outer diameters of lens elements increase
Solution Approach 1:
The fifth lens element is designed with specific local properties including aspheric surfaces and inflection points that enable effective aberration correction with a minimized outer diameter, allowing high image quality without excessive size increase.
Solution Approach 2:
The fifth lens element employs aspheric surfaces with inflection points instead of simple spherical surfaces, enabling more efficient light ray control and aberration correction with a smaller outer diameter compared to conventional spherical lens designs.
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 five-element lens system effectively reduces the total track length, corrects aberrations, and maintains high image quality, making it suitable for compact portable electronic devices without excessive size increase.
Implementation Method 1
The first lens element has positive refractive power. The second lens element has negative refractive power. The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface. The fourth lens element with negative refractive power has a concave object-side surface. The fifth lens element with refractive power has a concave image-side surface.
Data Source
AI summary
A photographing system 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 and a fifth lens element. The first lens element has positive refractive power. The second lens element has negative refractive power. The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface. The fourth lens element with negative refractive power has a concave object-side surface. The object-side surface and an image-side surface of the fourth lens element are aspheric. The fifth lens element with refractive power has a concave image-side surface. An object-side surface and the image-side surface of the fifth lens element are aspheric, and the fifth lens element has at least one inflection point formed on the image-side surface thereof.