Nine-Element Imaging Lens Assembly for Compact Aberration Correction
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Solution Overview
Problem
Conventional optical systems struggle to balance high image quality, low sensitivity, proper aperture size, miniaturization, and desirable field of view due to the scaling down of pixel size and increasing functionality requirements in electronic devices.
Innovation Solution
An imaging optical lens assembly comprising nine lens elements with specific refractive powers and surface configurations, including air gaps between adjacent elements, to optimize light convergence, reduce total track length, and correct aberrations, while allowing for miniaturization and flexibility in design.
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 image quality improves, but the total track length and device size increase
Solution Approach 1:
The optical system is divided into multiple lens elements (first through ninth lens elements) with specific positive and negative refractive powers. Each lens element is strategically positioned and designed with particular surface curvatures to correct specific types of aberrations while contributing to the overall compact configuration.
Solution Approach 2:
The patent utilizes complex surface geometries including aspheric surfaces with specific curvature radii relationships (e.g., R1/R2, R3/R4 ratios) to achieve aberration correction in a compact form factor, effectively using dimensional complexity of surface shapes rather than simply increasing linear dimensions.
2Manufacturing precision
If the aperture size is increased to improve light gathering capability, then image quality improves, but the sensitivity increases and device size increases
Solution Approach 1:
Different lens elements are assigned specific refractive powers (positive or negative) and surface curvature characteristics to locally optimize light control. For example, the first lens element has positive refractive power with specific curvature relationships, while the fourth lens element has negative refractive power, creating localized optical corrections throughout the system.
3Adaptability or versatility
If the field of view is expanded to improve functionality, then adaptability improves, but aberration correction becomes more difficult and image quality deteriorates
Solution Approach 1:
The optical system employs varied surface curvatures and refractive powers across different lens elements to dynamically adapt light paths from different field angles. The aspheric surfaces with specific curvature relationships enable the system to handle wide field of view requirements while maintaining image quality through optimized ray tracing for off-axis objects.
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 achieves improved image quality, reduced size, and enhanced field of view, balancing the demands of modern electronic devices by optimizing lens element arrangements and materials.
Implementation Method 1
The first lens element has positive refractive power. The second lens element has negative refractive power. The third lens element has positive refractive power. The fourth lens element has negative refractive power.
Data Source
AI summary
An imaging optical lens assembly includes nine lens elements which are, in order from an object side to an image side along an optical path: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element and a ninth lens element. The first lens element has positive refractive power. The eighth lens element with positive refractive power has an image-side surface being convex in a paraxial region thereof. The ninth lens element has an image-side surface being concave in a paraxial region thereof, and the image-side surface of the ninth lens element has at least one convex critical point in an off-axis region thereof.