Seven-Element Lens Assembly Aberration Correction
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Solution Overview
Problem
Modern electronic devices require optical lens systems that balance image quality, sensitivity, aperture size, and device size, while existing systems struggle to efficiently achieve these parameters due to limitations in refractive power distribution and aberration correction.
Innovation Solution
A photographing optical lens assembly comprising seven lens elements with specific refractive powers and surface curvatures, including aspheric surfaces, is designed to optimize image quality by correcting spherical aberrations, astigmatism, and chromatic aberrations, while minimizing the camera module's size and improving manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve image quality and correct aberrations, then the refractive power distribution and aberration correction are improved, but the device size and complexity increase
Solution Approach 1:
The lens assembly is divided into seven distinct lens elements with specific refractive power assignments (positive, negative, and zero power elements). Each element is strategically positioned and designed with particular surface curvatures to address specific aberration types, allowing complex optical correction to be achieved through modular segmentation rather than a single complex element
Solution Approach 2:
Different lens elements are assigned different refractive powers and surface curvature characteristics tailored to their specific functions. For example, the third lens element has a convex image-side surface to correct specific aberrations, while the fourth element has a concave image-side surface for different correction purposes. This localized optimization of optical properties at different positions enables comprehensive aberration correction without uniformly increasing complexity throughout the entire system
2Illumination intensity
If the aperture size is increased to improve sensitivity and light gathering, then the sensitivity and aperture size are improved, but the aberrations and image quality deteriorate
Solution Approach 1:
The lens assembly employs specific parameter relationships including focal length ratios (0.45<f/R8), curvature radius relationships ((0.10R5+R6)/(R5−R6)), and thickness-to-distance ratios (2.75ΣCT/ΣAT≤1). These parameter optimizations enable the system to maintain high sensitivity while controlling aberrations through precise geometric and optical parameter selection rather than simply increasing aperture size
3Volume of moving object
If the camera module size is reduced to meet device miniaturization requirements, then the device size is reduced, but the image quality and aberration correction capabilities deteriorate
Solution Approach 1:
The lens assembly achieves a compact configuration where seven lens elements are arranged in a nested-like sequence with optimized spacing. The sum of central thicknesses (ΣCT) and axial distances (ΣAT) are carefully balanced to minimize the total optical path length while maintaining adequate separation for aberration correction. This nested arrangement allows comprehensive optical correction within a minimized volume
Solution Approach 2:
The design utilizes aspheric surfaces on multiple lens elements (including the seventh element with both object-side and image-side aspheric surfaces) to add dimensional complexity to the optical paths. This allows for more efficient light ray control and aberration correction in a compact space, effectively using surface geometry dimensionality to overcome the limitations of reduced physical dimensions
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 assembly achieves a balanced refractive power distribution, enhances image quality, and reduces the camera module's size, enabling a wider field of view and improved relative illumination, while effectively correcting aberrations and optimizing the use of space.
Implementation Method 1
a photographing optical lens assembly 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
Data Source
AI summary
A photographing optical lens assembly 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. The third lens element with positive refractive power has an image-side surface being convex in a paraxial region thereof. The fourth lens element has an image-side surface being concave in a paraxial region thereof. The sixth lens element with positive refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof. The seventh lens element has an image-side surface being concave in a paraxial region thereof and having at least one critical point in an off-axis region thereof.