Six-Lens Photographing Assembly Aberration Control
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Solution Overview
Problem
Conventional optical systems in portable electronic devices, such as smartphones and tablets, fail to meet the demands for high-end camera functionalities due to inadequate image quality and excessive curvature changes in lens elements, leading to aberration issues and increased total track length.
Innovation Solution
A miniaturized photographing lens assembly comprising six lens elements with specific refractive powers and surface curvatures, including aspheric surfaces, is designed to optimize image quality by controlling aberrations and reducing the total track length through precise axial distance adjustments and material selection between lens elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional optical system with four or five lens elements is used, then the device complexity is reduced, but the image quality deteriorates and cannot satisfy high-end camera requirements
Solution Approach 1:
The patent applies parameter changes by specifying precise curvature radii, axial distances, and refractive indices for each lens element. The sixth lens element has a specific curvature radius relationship (0.1 < |R16/R15| < 1.0) and the fifth lens element has controlled curvature (0.05 < |1/R9| + |1/R10| < 0.15). These parameter optimizations enable high image quality with exactly six lens elements, resolving the contradiction between quality and complexity.
2Length of moving object
If the fifth lens element has a drastic curvature change to reduce total track length, then the compactness is improved, but the aberration control deteriorates and image quality worsens
Solution Approach 1:
The patent applies local quality by giving each lens element specific local characteristics. The fifth lens element has aspheric surfaces with controlled curvature (0.05 < |1/R9| + |1/R10| < 0.15), and the sixth lens element has a specific curvature radius relationship (0.1 < |R16/R15| < 1.0). This localized optimization of curvature at each surface enables compact total track length while maintaining excellent aberration control throughout the optical system.
3Manufacturing precision
If more lens elements are added to improve image quality, then the manufacturing precision is improved, but the total track length increases and miniaturization is hindered
Solution Approach 1:
The patent achieves optimal balance by using exactly six lens elements with precisely controlled parameters. The axial distances between elements are optimized (0.1 < T12/T23 < 0.5), and the sixth lens element's curvature radius ratio is controlled (0.1 < |R16/R15| < 1.0). This parameter optimization enables high image quality with a compact total track length, avoiding the need for more elements that would increase length.
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 provides improved image quality, reduced total track length, and increased manufacturing yield by effectively correcting spherical aberrations, astigmatism, and chromatic aberrations, while maintaining a compact size suitable for high-end camera applications.
Implementation Method 1
The fifth lens element has refractive power, wherein both of an object-side surface and an image-side surface of the fifth lens element are aspheric. The sixth lens element with refractive power has a concave image-side surface at a paraxial region thereof, wherein the image-side surface of the sixth lens element has a convex shape at an off-axis region thereof
Implementation Method 2
The first lens element with positive refractive power has a convex object-side surface at a paraxial region thereof. The second lens element has refractive power. The third lens element has refractive power. The fourth lens element with refractive power has a concave object-side surface at a paraxial region thereof and a convex image-side surface at a paraxial region thereof
Data Source
AI summary
A photographing 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, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface at a paraxial region. The second through the sixth lens elements have refractive power. The fourth lens element has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region. The fifth lens element has an aspheric object-side surface and an aspheric image-side surface. The sixth lens element has a concave image-side surface at a paraxial region, wherein the image-side surface thereof has a convex shape at an off-axis region, and both surfaces thereof are aspheric. The photographing lens assembly has a total of six lens elements with refractive power.