Four-Element Lens System with Aspheric Surfaces
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Solution Overview
Problem
Conventional compact optical systems for portable electronic devices, such as smartphones and tablets, fail to meet the demands for high resolution and image quality due to limitations in refractive power arrangement and total track length.
Innovation Solution
A compact image capturing lens system comprising four lens elements with specific refractive powers and surface configurations, including positive and negative refractive powers, aspheric surfaces, and strategically placed inflection points, optimized to reduce spherical aberration, astigmatism, and total track length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional three-element lens structure is used, then the device complexity is reduced, but the image quality and resolution are insufficient
Solution Approach 1:
The patent divides the optical system into four distinct lens elements with specific refractive power distributions. The first lens element has positive refractive power, the second has negative refractive power, the third has positive refractive power, and the fourth has negative refractive power. This segmentation allows each element to contribute differently to aberration correction, achieving superior image quality that cannot be obtained with a conventional three-element structure.
2Manufacturing precision
If a four-element lens structure is used to enhance image quality, then the resolution is improved, but the total track length increases
Solution Approach 1:
The patent employs aspheric surfaces for all four lens elements, defined by specific mathematical equations with multiple parameters (conic constant k and aspheric coefficients A4, A6, A8, A10). This parameter optimization allows the lens system to achieve high image quality while maintaining a compact total track length, as the aspheric profiles enable more efficient light path control compared to conventional spherical surfaces.
Solution Approach 2:
The patent introduces inflection points on the object-side surfaces of the second and third lens elements, creating complex surface profiles that cannot be described by simple spherical or conic sections. This dimensional complexity in the surface geometry allows for better aberration control in a shorter optical path, effectively reducing the total track length while maintaining image quality.
3Ease of manufacture
If lens elements with improper refractive power arrangement are used, then the manufacturing is simplified, but the total track length cannot be reduced effectively
Solution Approach 1:
The patent assigns specific local properties to each lens element: the first element has positive refractive power with a convex object-side surface, the second has negative refractive power with an inflection point on its object-side surface, the third has positive refractive power with an inflection point, and the fourth has negative refractive power. This localized optimization of refractive power distribution allows for effective total track length reduction while maintaining manufacturability.
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 achieves improved image quality, telephoto functionality, and a compact design with balanced refractive powers, effectively addressing the limitations of conventional systems by enhancing resolution and reducing aberrations and system sensitivity.
Implementation Method 1
an image capturing lens system includes, 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
Implementation Method 2
both of an object-side surface and the image-side surface of the fourth lens element are aspheric
Data Source
AI summary
An image capturing lens system includes, 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. The first lens element with positive refractive power has a convex object-side surface in a paraxial region thereof and a convex image-side surface in a paraxial region thereof. The second lens element has positive refractive power. The third lens element has positive refractive power. The fourth lens element with negative refractive power has a concave image-side surface in a paraxial region thereof, wherein both of an object-side surface and the image-side surface of the fourth lens element are aspheric. The image capturing lens system has a total of four lens elements with refractive power.