Seven-Lens Optical Imaging for High-Resolution Compact Camera Modules
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Solution Overview
Problem
Mobile communications terminals require camera modules with higher resolution and compactness due to increased functionality and miniaturization demands.
Innovation Solution
An optical imaging system comprising seven lenses with specific refractive powers and arrangements, including aspherical surfaces, to achieve high resolution and compact size, with constraints on focal lengths, Abbe numbers, and optical axis distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to improve resolution, then imaging resolution is improved, but device size and complexity increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers, Abbe numbers, and focal lengths of each lens element. Specific mathematical relationships are established between these parameters (e.g., f1/f < 2.0, f2/f between -10 and 0, f3/f > 1.5, |f4/f| > 3.0) to optimize the seven-lens system for high resolution while managing complexity through systematic parameter optimization rather than arbitrary design
Solution Approach 2:
The patent employs composite material principles by combining lenses with different refractive indices and Abbe numbers (v1-v2 between 25 and 45, v1-v3 less than 25, v1-v5 between 15 and 35) to achieve chromatic aberration correction and high resolution. Each lens element is designed with specific optical properties that complement the others, creating a composite optical system where the whole achieves performance greater than the sum of individual parts
2Measurement precision
If the number of lenses is increased to improve resolution, then imaging resolution is improved, but the overall device size increases
Solution Approach 1:
The patent controls the total track length (TTL) through precise parameter optimization of the seven-lens system. By establishing specific focal length relationships (f1/f < 2.0, f2/f between -10 and 0, f3/f > 1.5, |f4/f| > 3.0) and controlling the ratio TTL/f < 1.4, the system achieves high resolution with minimized device length, allowing compact integration in mobile terminals
3Length of stationary object
If the camera module is made slimmer to meet miniaturization demands, then device compactness is improved, but optical performance may deteriorate
Solution Approach 1:
The patent achieves slim form factor (BFL/f < 0.4) while maintaining high imaging quality through systematic parameter optimization. The seven-lens configuration with controlled focal lengths (f1, f2, f3, f4, f5, f6, f7) and their relationships to overall focal length f enables compact design without sacrificing resolution. The aspherical surface parameters are also optimized to maintain optical performance in the reduced space
Solution Approach 2:
The patent employs aspherical surfaces in the lens elements to achieve high resolution in a compact configuration. The aspherical parameters (A4, A6, A8, A10, A12, A14, A16, A18, A20) for each lens surface enable precise control of light rays, allowing the system to achieve diffraction-limited performance with reduced track length and thickness that would be difficult to achieve with spherical surfaces alone
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, meeting the demands for miniaturized mobile devices with improved imaging capabilities.
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, and a seventh 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, and a seventh lens, sequentially arranged from an object side, wherein TTL/(2*Img HT)<0.7, where a distance on an optical axis from an object-side surface of the first lens to an imaging plane of an image sensor is TTL, and half of a diagonal length of the imaging plane of the image sensor is Img HT, and Fno<1.9, where an F-number of the optical imaging system is Fno.