Five-Element Lens System Aberration Correction
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Solution Overview
Problem
Conventional four-piece lens structures in compact photographing lenses for portable electronic devices fail to meet the increasing demands for higher image quality and reduced total track length, which are essential for modern high-performance and compact mobile electronics.
Innovation Solution
A five-element lens system is designed with specific refractive powers and surface curvatures, including a first lens element with negative refractive power, a second lens element with positive or negative refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power connected to the third, and a fifth lens element with negative refractive power, along with an aperture stop to enhance wide-angle characteristics and correct aberrations, while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-piece lens structure is used, then the device complexity is low, but the image quality cannot satisfy high specification requirements
Solution Approach 1:
The lens system divides the optical system into five distinct lens elements with specific refractive powers and surface curvatures. Each element is optimized for specific aberration correction functions, allowing the system to achieve superior image quality while maintaining manageable complexity through functional segmentation.
2Manufacturing precision
If the lens system is designed for high image quality, then the manufacturing precision increases, but the total track length increases
Solution Approach 1:
The patent employs specific parameter relationships between lens elements, including focal length ratios (0.2<f5/f1<0.8), curvature radius relationships (R1<R2<0, R3>R4>0), and spacing constraints (0.05<T23<0.30). These parameter optimizations enable compact total track length while maintaining high image quality through precise optical design.
3Length of stationary object
If a compact lens system is designed, then the total track length is reduced, but the wide-angle characteristics are insufficient
Solution Approach 1:
The lens system employs asymmetric surface curvatures with specific relationships (R1<R2<0, R3>R4>0) and asymmetric refractive power distribution across the five elements. This asymmetric design enables wide-angle field of view while maintaining compact total track length, as the asymmetric configuration optimizes light path control for wide-angle applications.
4Manufacturing precision
If the lens elements are optimized for aberration correction, then the image quality improves, but the device complexity increases
Solution Approach 1:
Each lens element is assigned specific local optical properties: the first element has negative refractive power for field curvature correction, the second element provides additional negative power for astigmatism control, the third element contributes positive power, the fourth element offers negative power for coma correction, and the fifth element provides final negative power optimization. This localized functional assignment achieves comprehensive aberration correction while maintaining clear structural organization.
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 achieves high image quality, reduces total track length, and enhances wide-angle characteristics, effectively addressing the limitations of conventional compact photographing lenses by correcting aberrations and maintaining a compact size suitable for portable electronic devices.
Implementation Method 1
The first lens element with negative refractive power has a convex object-side surface and a concave image-side surface. The second lens element is with refractive power. The third lens element with positive refractive power has a convex image-side surface. The fourth lens element with negative refractive power has a concave object-side surface, wherein the fourth lens element is connected to the third lens element. The fifth lens element is with negative refractive power.
Data Source
AI summary
A lens system includes, in order from an object side to an image side: the first lens element with negative refractive power having a convex object-side surface and concave image-side surface, the second lens element with refractive power, the third lens element with positive refractive power having a convex image-side surface, the fourth lens element with negative refractive power having a concave object-side surface, the fourth lens element connected to the third lens element, and the fifth lens element with negative refractive power. By such arrangement, the aberration of the lens system can be corrected. The photosensitivity of the lens system can be effectively reduced while retaining high image quality.