Seven-Element Lens System Aberration Control
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Solution Overview
Problem
Modern electronic devices require optical lens systems that balance image quality, sensitivity, aperture size, and device size, but existing systems struggle to efficiently achieve these parameters due to limitations in refractive power distribution and aberration correction.
Innovation Solution
A photographing lens system comprising seven lens elements with specific refractive powers and surface curvatures, including a first lens element with positive refractive power and a seventh lens element with a concave image-side surface and inflection points, optimized to control refractive power distribution and correct aberrations, allowing for a compact and high-image-quality design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the refractive power distribution is optimized to improve image quality, then the aberration correction is improved, but the device complexity increases due to the need for multiple lens elements with specific curvatures
Solution Approach 1:
The optical lens system is divided into seven distinct lens elements, each with specific refractive power and surface curvature characteristics. This segmentation allows independent optimization of each element's aberration correction function while collectively achieving high image quality. The first lens element has positive refractive power with specific curvature radius R1, the second has curvature radius R3, and the seventh has a concave image-side surface with inflection points, enabling distributed aberration control throughout the system.
Solution Approach 2:
Different regions of the lens system are assigned different optical properties to address local aberration issues. The seventh lens element specifically features a concave image-side surface with inflection points in the off-axis region, while maintaining a specific curvature in the paraxial region. This local variation in surface geometry allows targeted correction of off-axis aberrations without compromising on-axis performance, thereby improving overall image quality through localized optimization.
2Manufacturing precision
If the lens system is designed with multiple elements to correct aberrations, then the image quality is improved, but the size of the lens system increases
Solution Approach 1:
The lens system employs dynamic optimization of the spacing and positioning of the seven lens elements to achieve compact dimensions. The axial distances between adjacent elements are precisely controlled to minimize the total track length while maintaining effective aberration correction. This dynamic arrangement allows the system to achieve high image quality with a reduced form factor compared to traditional fixed-configuration multi-element lenses.
Solution Approach 2:
The system utilizes specific parameter relationships to compact the design: the focal length ratios (f/f1, f/f2, f/f6, f/f7) and curvature radius ratios (R3/R1, f/R4) are optimized to achieve balanced refractive power distribution. The seventh lens element's specific configuration (concave image-side surface with inflection points) allows for reduced back focal length while maintaining correction effectiveness, thereby reducing the overall lens system size without sacrificing image quality.
3Use of energy by moving object
If the aperture size is increased to improve sensitivity, then the light gathering capability is improved, but the aberration control becomes more difficult
Solution Approach 1:
The lens system incorporates preliminary aberration correction mechanisms through the specific configuration of the first and seventh lens elements. The first lens element with positive refractive power and specific curvature R1 pre-corrects certain aberrations before light enters subsequent elements. The seventh lens element with its concave image-side surface and inflection points provides preliminary correction of field curvature and distortion. This preliminary action reduces the burden on later elements, enabling better aberration control even with larger aperture sizes that increase sensitivity.
Solution Approach 2:
The seven lens elements collectively act as intermediaries to manage the trade-off between aperture size and aberration control. Each element serves as an intermediary that progressively refines the wavefront, with the second lens element (curvature R3) and sixth lens element (focal length f6) providing intermediate correction stages. This multi-stage intermediary approach allows the system to maintain aberration control while accommodating larger apertures for improved sensitivity and light gathering capability.
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 a balanced refractive power distribution, corrects aberrations, and ensures a compact size, enhancing image quality and adaptability while maintaining sensitivity and aperture size requirements.
Implementation Method 1
the first lens element has positive refractive power
Implementation Method 2
the seventh lens element has an image-side surface being concave in a paraxial region thereof and having at least one inflection point in an off-axis region thereof
Data Source
AI summary
A photographing lens system includes seven lens elements, the seven lens elements being, 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, a fifth lens element, a sixth lens element, and a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The first lens element has positive refractive power. The image-side surface of the seventh lens element is concave in a paraxial region thereof and has at least one inflection point in an off-axis region thereof.