Nine-Lens Optical Imaging Layout for Slim High-Resolution Cameras
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Solution Overview
Problem
Mobile terminals require slim and high-resolution camera modules that meet the increasing functionality demands while maintaining optical performance.
Innovation Solution
An optical imaging system comprising nine lenses with specific refractive powers, arrangements, and aspherical surfaces, optimized for compactness and high resolution, including a first lens with positive refractive power and convex object-side surface, and a second lens with negative refractive power and convex object-side surface, among others, with constraints such as TTL/(2*IMG HT) < 0.61 and Fno < 2.3.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to improve resolution, then imaging quality is improved, but the overall length and complexity of the optical system increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices, Abbe numbers, and focal lengths of each lens element. Specific conditions are set for parameters such as TTL/ΣCT > 2, Fno < 2.3, and various lens power ratios to achieve high resolution in a compact configuration. This allows optimization of the optical path to reduce overall length while maintaining imaging quality through nine lens elements with carefully selected optical parameters
Solution Approach 2:
The optical system is segmented into nine distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to contribute specifically to correcting different types of optical aberrations, enabling high-resolution imaging while keeping the total track length compact through optimized distribution of optical power across multiple elements
2Measurement precision
If the number of lenses is increased to improve resolution, then imaging quality is improved, but device complexity increases
Solution Approach 1:
The patent manages complexity through systematic parameter control, establishing specific conditions for each lens element's refractive index, Abbe number, and focal length relationships. By defining clear parameter ranges and ratios (such as Fno < 2.3 and TTL/ΣCT > 2), the design process becomes more structured and manufacturable despite having nine elements, reducing the practical complexity of implementation
Solution Approach 2:
Multiple lens elements with alternating positive and negative powers are combined in a specific sequence to achieve correction of multiple aberration types simultaneously. The merging of these elements creates a unified optical system where the cumulative effect of all nine elements produces high-resolution imaging with controlled complexity through their coordinated optical powers
3Illumination intensity
If the f-number is decreased to improve brightness, then light gathering ability is improved, but optical aberrations become more difficult to control
Solution Approach 1:
The patent achieves Fno < 2.3 (bright optical performance) while controlling aberrations through careful selection of lens parameters including refractive indices greater than 1.6 for specific elements, controlled Abbe number differences (v1−v2 > 30), and optimized focal length ratios. These parameter changes enable the system to gather more light while maintaining aberration control through the balanced distribution of positive and negative lens powers
Solution Approach 2:
The optical system uses composite lens design with elements having different refractive indices and Abbe numbers (including materials with n > 1.6). This composite approach allows the system to achieve low Fno for brightness while the varying material properties help correct chromatic and spherical aberrations that would otherwise be difficult to control at low f-numbers
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 system achieves high resolution and compactness, ensuring a bright optical performance with an f-number less than 2.3, while maintaining a slim form factor suitable for mobile terminals.
Implementation Method 1
an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens sequentially arranged from an object side
Data Source
AI summary
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens sequentially arranged from an object side, wherein the first lens has positive refractive power, the second lens has negative refractive power and a refractive index higher than 1.6, any one of the third lens and the fourth lens has a refractive index higher than 1.6, the sixth lens has negative refractive power and a refractive index higher than 1.6, and TTL/(2*IMG HT)<0.61, where TTL is a distance on an optical axis from an object-side surface of the first lens to an imaging plane, and IMG HT is half a diagonal length of the imaging plane.