Four-Element Mobile Lens with Aspheric Surfaces for Resolving Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional compact optical systems in mobile terminals fail to meet requirements for high resolution, image quality, and cost-effectiveness due to limitations in resolving power, illumination, and manufacturing complexity, particularly in peripheral regions and sensitivity.
Innovation Solution
A compact image capturing lens system comprising four non-cemented lens elements with specific refractive powers and surface shapes, including convex and concave aspheric surfaces, optimized to improve resolving power, illumination, and manufacturing simplicity, with conditions such as |f3/f2| < 0.60 and 0.6 < T23/T12 < 3.6, ensuring better image quality and reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a three-element lens structure is used, then the device complexity is reduced, but the resolving power and image quality deteriorate
Solution Approach 1:
The optical system is divided into four separate lens elements rather than three, with each element having specific refractive powers and surface shapes. This segmentation allows each element to contribute to correcting aberrations and improving resolving power while maintaining reasonable complexity
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, including the object-side surface of the first element, image-side surface of the second element, and both surfaces of the fourth element. These curved surfaces are optimized to correct spherical aberration and improve resolving power without significantly increasing manufacturing complexity
2Manufacturing precision
If a four-element lens structure is used, then the resolving power is improved, but the manufacturing cost increases
Solution Approach 1:
The patent specifies particular parameter ranges for the lens system, including focal length ratios (|f3/f2| < 0.60), axial distance ratios (0.6 < T23/T12 < 3.6), and thickness ratios (0.2 < CT1/(CT2+CT3) < 1.5). These parameter optimizations balance manufacturing feasibility with performance requirements, reducing costs while maintaining resolving power
Solution Approach 2:
Different lens elements have different surface configurations tailored to their specific functions: the first element has a convex object-side surface for light convergence, the second has a concave object-side and convex image-side surface for aberration correction, the third has a concave object-side surface, and the fourth has aspheric surfaces with specific convex regions. This localized optimization improves overall performance while managing manufacturing complexity
3Manufacturing precision
If a four-element lens structure is used, then the resolving power is improved, but the illumination in peripheral regions deteriorates
Solution Approach 1:
The aspheric surfaces, particularly on the fourth lens element which has a concave image-side surface with at least one convex shape in the off-axis region, are designed to redirect marginal rays and improve illumination uniformity across the image plane, including peripheral regions
Solution Approach 2:
The fourth lens element's image-side surface features localized convex shapes in off-axis regions, creating areas with different optical properties that specifically address peripheral illumination while maintaining central region performance and resolving power
4Ease of manufacture
If conventional lens structures are used, then the manufacturing is simpler, but the sensitivity to manufacturing tolerances increases
Solution Approach 1:
The patent defines specific parameter ranges that optimize the system's insensitivity to manufacturing tolerances, including the focal length ratio |f3/f2| < 0.60, axial distance ratio 0.6 < T23/T12 < 3.6, and thickness ratio 0.2 < CT1/(CT2+CT3) < 1.5. These parameter selections create a more robust optical system that maintains performance despite normal manufacturing variations
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 enhanced resolving power, illumination, and reduced sensitivity in peripheral regions while maintaining a compact size and lower manufacturing costs, addressing the limitations of conventional systems.
Implementation Method 1
a first lens element 110 with positive refractive power, a second lens element 120 with negative refractive power, a third lens element 130 with negative refractive power, and a fourth lens element 140 with positive refractive power
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 an object-side surface being convex in a paraxial region thereof. The second lens element with refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The third lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof. The fourth lens element with refractive power has an image-side surface being concave in a paraxial region thereof, wherein 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.