Seven-Lens Optical Imaging Structure for Short High-Resolution Modules
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mobile communications terminals require camera modules with higher resolution and compactness due to miniaturization, posing a challenge in achieving both high optical performance and small size.
Innovation Solution
An optical imaging system comprising seven lenses with specific refractive powers and arrangements, including aspherical surfaces, to optimize focal lengths and aberration control, ensuring high resolution and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to improve resolution, then optical performance is improved, but the overall length of the camera module increases
Solution Approach 1:
The camera module divides the optical system into seven distinct lens groups with alternating positive and negative refractive powers. This segmentation allows each lens to contribute to resolution while the grouped arrangement optimizes the overall path length, achieving high resolution without proportionally increasing the total module length.
Solution Approach 2:
The patent employs specific parameter ranges for each lens including refractive power ratios (e.g., f1/f < 2.0, f2/f between -10 and 0), Abbe number differences (e.g., v1-v2 between 25 and 45), and focal length relationships (e.g., TTL/f < 1.4). These parameter optimizations enable compact lens arrangement that maintains high resolution while minimizing overall length.
2Length of moving object
If the camera module is miniaturized to reduce size, then compactness is improved, but optical performance deteriorates
Solution Approach 1:
The seven lenses are arranged in a nested configuration where each subsequent lens is positioned to optimize the optical path within the constrained module size. The alternating positive-negative refractive power arrangement creates a compact nested structure that maintains optical performance while reducing overall module dimensions.
Solution Approach 2:
The patent optimizes the optical system in multiple dimensions by controlling not only the axial length (TTL/f < 1.4) but also the radial arrangement through specific focal length ratios (e.g., f3/f > 1.5, |f4/f| > 3.0) and field of view constraints (FOV < 80°). This multi-dimensional optimization achieves compactness without sacrificing optical performance.
3Length of moving object
If the focal length is reduced to achieve compactness, then module size is reduced, but resolution capability deteriorates
Solution Approach 1:
The optical system uses a composite arrangement of seven lenses with alternating positive and negative refractive powers, creating a composite optical system. This composite structure allows the effective focal length to be reduced for compactness while the combined refractive effects of all seven lenses maintain the resolution capability that would normally require a longer focal length.
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 of miniaturized mobile communications terminals while maintaining optical performance.
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.