Five-Element Aspheric Lens Balancing Refractive Power
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Solution Overview
Problem
Conventional compact optical lens assemblies, particularly those with four-element and five-element lens structures, fail to meet the increasing demands for high image quality and fabrication yield due to unbalanced refractive power distribution and sensitivity issues.
Innovation Solution
An image capturing optical lens assembly comprising a specific configuration of five lens elements with aspheric surfaces and refractive powers, including a first lens with positive refractive power, a second with negative refractive power, a third with positive refractive power, a fourth with positive refractive power, and a fifth made of plastic with a concave image-side surface and at least one inflection point, optimized to balance refractive power and reduce sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional four-element lens structure is used, then the device complexity is reduced, but the image quality and resolution cannot satisfy high-end requirements
Solution Approach 1:
The optical lens assembly is divided into five distinct lens elements with specific refractive power distributions. Each lens element is designed with particular surface curvatures and aspheric coefficients to independently correct specific aberrations, thereby achieving high image quality through segmented functional design
Solution Approach 2:
Different lens elements are assigned specific local optical functions: the first lens element with positive refractive power for primary focusing, the second with negative refractive power for aberration correction, and subsequent elements with tailored aspheric surfaces for specific distortion and spherical aberration correction. This local optimization of optical properties achieves overall superior image quality
2Manufacturing precision
If a five-element lens structure is used to improve image quality, then the resolution and image quality are enhanced, but the sensitivity becomes more pronounced due to unbalanced refractive power distribution
Solution Approach 1:
The patent specifies precise parameter ranges for refractive powers (f1, f2, f3, f4, f5), curvature radii (R1, R2, R3, R4, R5, R6), and axial distances (T1, T2, T3, T4) to balance the optical system. These parameter optimizations ensure that the positive and negative refractive powers are properly distributed, reducing system sensitivity while maintaining high image quality
Solution Approach 2:
The refractive power distribution is balanced so that the positive refractive power elements (first, third, fourth lens elements) and the negative refractive power element (second lens element) are equipotentially distributed throughout the optical path. This balanced distribution equalizes the sensitivity across different lens elements, improving fabrication yield
3Manufacturing precision
If more lens elements are added to improve image quality, then the resolution increases, but the device complexity and sensitivity increase
Solution Approach 1:
The patent uses exactly five lens elements, which is sufficient to achieve high image quality without excessive complexity. Each lens element performs specific partial functions (focusing, aberration correction, distortion correction) rather than requiring all elements to perform all functions, optimizing the balance between image quality and device complexity
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 enhances image quality, reduces spherical aberration, and increases fabrication yield by balancing refractive power and minimizing sensitivity, while maintaining a compact size suitable for portable electronic devices.
Implementation Method 1
The first lens element with positive refractive power has a convex object-side surface. The second lens element with negative refractive power has a concave image-side surface. The third lens element with positive refractive power has a convex image-side surface, wherein an object-side surface and the image-side surface of the third lens element are aspheric.
Implementation Method 2
The fifth lens element with refractive power made of plastic material and has a concave image-side surface, wherein 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 at least one of the object-side surface and the image-side surface thereof.
Data Source
AI summary
An image capturing optical lens assembly 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 with positive refractive power has a convex object-side surface. The second lens element with negative refractive power has a concave image-side surface. The third lens element with positive refractive power has a convex image-side surface. The fourth lens element has positive refractive power. The fifth lens element with refractive power is made of plastic material and has a concave image-side surface. At least one inflection point is formed on at least one of the object-side and image-side surfaces of the fifth lens element. The surfaces of the third lens element, the fourth lens element and the fifth lens element are aspheric.