Eight-Lens Optical Imaging Assembly for Aberration Control
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Solution Overview
Problem
The challenge is to develop an optical imaging lens assembly for portable electronic products that achieves high resolution, large image surface, and high imaging quality while maintaining a small size, which existing lens designs struggle to balance due to excessive light deflection and aberrations.
Innovation Solution
The optical imaging lens assembly consists of eight lenses with specific refractive powers and optimized optical parameters, including aspheric surfaces, to achieve a total effective focal length greater than 7.5 mm, with each of the fourth, fifth, and sixth lenses having negative refractive power, and carefully configured curvature radii and spacing distances to minimize aberrations and maximize imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens assembly uses conventional lens designs to achieve high resolution and large image surface, then the imaging quality improves, but the size becomes excessively large
Solution Approach 1:
The lens assembly is divided into eight individual lenses with specific refractive powers, allowing each lens to be optimized for particular functions while maintaining a compact overall structure. The segmentation of optical functions across multiple smaller lenses enables high imaging quality without requiring a single large lens element.
Solution Approach 2:
The patent applies specific parameter optimizations including negative refractive power for lenses 4, 5, and 6, aspheric surface configurations, and precise curvature radius values (e.g., R11, R12 for the sixth lens). These parameter changes enable the lens assembly to achieve high resolution and large image surface while maintaining a compact size suitable for portable electronic products.
2Measurement precision
If the lens assembly increases the number of lenses to improve resolution, then the imaging quality improves, but the complexity of the system increases
Solution Approach 1:
The eight-lens configuration segments the optical system into functional groups where lenses 1-3 handle initial light gathering and focusing, lenses 4-6 (with negative refractive power) correct aberrations and expand the image surface, and lenses 7-8 finalize the imaging. This segmentation allows high resolution to be achieved through coordinated optical functions rather than requiring a more complex single-lens system.
Solution Approach 2:
By optimizing specific parameters such as the negative refractive power of lenses 4, 5, and 6, and their corresponding curvature radii and spacing distances, the patent achieves high resolution while controlling system complexity. The aspheric surface parameters and precise dimensional specifications ensure that each lens contributes efficiently to the overall optical performance.
3Area of stationary object
If the lens assembly uses strong refractive power to achieve large image surface, then the image surface area improves, but light deflection and aberrations increase
Solution Approach 1:
The patent applies local quality by assigning specific refractive power characteristics to specific lenses. Lenses 4, 5, and 6 are specifically designed with negative refractive power to handle aberration correction and image surface expansion in particular regions of the optical path. The aspheric surfaces are strategically positioned to correct local aberrations while maintaining overall optical performance.
Solution Approach 2:
The patent uses parameter changes including negative refractive power values and specific curvature radii (e.g., R11, R12 for the sixth lens) to balance image surface area with aberration control. The aspheric surface parameters and spacing distances are optimized to reduce light deflection while achieving the desired large image surface, thereby minimizing harmful optical aberrations.
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 results in a lens assembly that achieves high resolution, large image surface, and high imaging quality with a small size, effectively balancing aberrations and reducing light deflection, thereby enhancing the performance and machinability of the lens system.
Implementation Method 1
an optical imaging lens assembly, which sequentially includes from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens with refractive power respectively
Implementation Method 2
an object-side surface of the first lens to an image-side surface of the eighth lens includes at least one aspheric mirror surface
Data Source
AI summary
The disclosure provides an optical imaging lens assembly, which sequentially includes, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens with refractive power respectively. Each of the fourth lens, the fifth lens and the sixth lens has negative refractive power. A total effective focal length f of the optical imaging lens assembly satisfies f>7.5 mm. A curvature radius R11 of an object-side surface of the sixth lens, a curvature radius R12 of an image-side surface of the sixth lens, a refractive index N6 of the sixth lens and an abbe number V6 of the sixth lens satisfy 1.0 mm−1<V6/(R11+R12×N6)<2.0 mm−1.