Seven-Lens Optical Assembly Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical lenses face challenges in achieving a balance among imaging quality, sensitivity, aperture size, volume, and field of view, making it difficult to meet the diverse demands of modern electronic devices with high-performance image sensors.
Innovation Solution
The imaging optical lens assembly consists of seven lens elements with specific refractive powers and surface shapes, including aspheric surfaces, carefully arranged to optimize refractive power distribution, correct aberrations, and reduce manufacturing sensitivity, while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical lenses are used, then the structure is simple, but the imaging quality and aberration correction are insufficient
Solution Approach 1:
The optical lens assembly is divided into seven separate lens elements with different refractive powers and surface shapes. Each lens element is designed to correct specific types of aberrations, allowing the system to achieve high imaging quality through the cumulative effect of multiple specialized components rather than relying on a single complex lens.
Solution Approach 2:
Different lens elements are assigned specific local functions based on their position in the optical path. For example, the first lens element with positive refractive power corrects spherical aberration, while the second lens element with negative refractive power corrects chromatic aberration. Each element's surface shape (convex or concave) is optimized for its specific corrective function.
2Illumination intensity
If the aperture size is increased to improve sensitivity, then the sensitivity improves, but the volume and field of view requirements become harder to meet
Solution Approach 1:
The patent optimizes multiple parameters simultaneously including the refractive indices of different lens elements, their respective curvatures, and spacing distances. By carefully selecting parameters such as the curvature radius of the object-side surface of the third lens element (R5) and the image-side surface of the fifth lens element (R10), the system achieves high sensitivity with a compact form factor.
Solution Approach 2:
The optical system uses lens elements made of different materials with varying refractive indices and Abbe numbers. The second and third lens elements use materials with lower Abbe numbers (V2+V3≤70) to correct chromatic aberration, while other elements use materials with higher Abbe numbers. This composite material approach allows the system to maintain compact size while achieving high sensitivity through effective light gathering and correction.
3Manufacturing precision
If more lens elements are added to correct aberrations, then the imaging quality improves, but the manufacturing sensitivity increases
Solution Approach 1:
The patent establishes specific parameter ranges to control manufacturing sensitivity. For example, the ratio T67/T45 is constrained within a specific range, as are the curvature radii R5 and R10 relative to the focal length f. These parameter constraints ensure that the system maintains good aberration correction while being tolerant to manufacturing variations.
Solution Approach 2:
The patent employs aspheric surfaces on key lens elements, particularly the seventh lens element which has an aspheric image-side surface with at least one critical point in the off-axis region. Aspheric surfaces provide superior aberration correction compared to spherical surfaces while the specific design constraints keep the manufacturing complexity at acceptable levels.
4Adaptability or versatility
If the focal length is increased to improve field of view, then the field of view expands, but the total length of the lens assembly increases
Solution Approach 1:
The patent optimizes the focal length parameter f in conjunction with the curvature radii R5 and R10 to achieve a compact design. By setting specific relationships between these parameters (0≤f/R5 and 0≤f/R10), the system achieves an expanded field of view while maintaining a short total length TL, effectively decoupling the traditional trade-off between field of view and lens length.
Solution Approach 2:
The seven-lens-element configuration allows the optical power to be distributed across multiple elements rather than concentrated in a single long focal length lens. This segmentation enables the system to achieve a wide field of view with a compact total length by using multiple shorter optical paths in sequence.
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
This configuration enhances image quality, corrects various aberrations, and optimizes the balance between imaging performance and device specifications, such as field of view and sensitivity, effectively addressing the limitations of conventional lenses.
Implementation Method 1
The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof
Implementation Method 2
the image-side surface and an object-side surface of the seventh lens element are both aspheric
Data Source
AI summary
An imaging optical lens assembly includes seven lens elements, the seventh 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 first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The seventh lens element has an image-side surface being concave in a paraxial region thereof and having a critical point in an off-axis region thereof. The image-side surface and an object-side surface of the seventh lens element are both aspheric.