Six-Element Aspheric Lens Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional compact optical systems for electronic devices, such as smartphones and tablets, fail to meet the requirements of high resolution and image quality due to limitations in refractive power, surface shape, and aberration correction, particularly with six-element lens structures.
Innovation Solution
A six-element photographing optical lens design featuring single, non-cemented lens elements with specific refractive powers and aspheric surfaces, including a stop between the object and the second lens element, to enhance image quality by correcting aberrations and reducing back focal length and total track length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional four-element or five-element lens structures are used, then the device complexity is reduced, but the image quality and resolution cannot satisfy high-end requirements
Solution Approach 1:
The optical system is divided into six independent lens elements rather than using conventional four or five elements. Each lens element is designed with specific refractive power and aspheric surfaces to correct various aberrations. This segmentation allows for more precise control over light propagation and improved image quality while maintaining compact form factor.
Solution Approach 2:
Multiple lens elements (first, second, third, fourth, fifth, and sixth lens elements) are designed with aspheric surfaces instead of simple spherical surfaces. The aspheric surfaces include specific curvature radii (R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12) that are optimized to correct spherical aberration, astigmatism, and other optical imperfections, thereby improving image sharpness and quality.
2Length of moving object
If the back focal length is reduced to make the system compact, then the total track length is shortened, but the diverging ability at the image side is insufficient
Solution Approach 1:
The fifth and sixth lens elements are specifically designed with negative refractive power and concave surfaces in their paraxial regions. The focal lengths (f5, f6) and curvature radii (R10, R11) of these elements are carefully controlled to provide strong diverging ability at the image side. This allows the back focal length to be reduced while maintaining adequate light divergence for high-quality image formation on the sensor.
3Manufacturing precision
If the converging intensity at the optical axis is increased to improve image sharpness, then the image quality is enhanced, but the spherical aberration and astigmatism worsen
Solution Approach 1:
Different lens elements are assigned different refractive powers and surface curvatures tailored to their specific positions in the optical system. The first lens element has positive refractive power with specific curvatures (R1, R2), while the second through fourth elements have varying refractive powers with optimized curvatures (R3-R8). The fifth and sixth elements have negative refractive power with concave surfaces (R9-R12). This localized optimization of optical properties at each position enables precise control over light convergence and aberration correction throughout the system.
Solution Approach 2:
The optical system employs a composite structure of six different lens elements, each with specifically selected refractive indices and dispersion properties. The combination of these heterogeneous lens elements, with varying materials and designs, allows the system to achieve high converging intensity on the optical axis while simultaneously correcting spherical aberration and astigmatism through the complementary optical properties of individual elements.
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 design improves image sharpness and quality by moderating converging intensity, correcting spherical aberration and astigmatism, and maintaining a compact size suitable for portable electronics.
Implementation Method 1
The object-side surface and the image-side surface of the fifth lens element are aspheric. The object-side surface and the image-side surface of the sixth lens element are aspheric
Implementation Method 2
correcting spherical aberration and astigmatism
Implementation Method 3
correcting spherical aberration and astigmatism
Implementation Method 4
enhancing the diverging ability at the image side and reducing the back focal length
Implementation Method 5
the converging intensity at the optical axis cannot be moderated for enhancing the image sharpness
Data Source
AI summary
A photographing optical lens 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, a fifth lens element and a sixth lens element. The first lens element has positive refractive power. The second lens element, the third lens element, and the fourth lens element have refractive power. The fifth lens element with negative refractive power has an aspheric object-side surface and an aspheric image-side surface being concave in a paraxial region thereof. The sixth lens element with negative refractive power has an aspheric object-side surface being concave in a paraxial region thereof and an aspheric image-side surface being concave in a paraxial region thereof, wherein the image-side surface thereof has at least one inflection point. The photographing optical lens further includes a stop located between an object and the second lens element.