Seven-Lens Optical Imaging System Aberration Correction
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Solution Overview
Problem
The challenge is to develop an optical imaging system that balances miniaturization, high image quality, and cost-effectiveness for electronic products, particularly in smartphones, while meeting user demands for improved imaging performance and design flexibility.
Innovation Solution
The optical imaging system comprises seven lenses with specific refractive powers and aspherical surfaces, optimized parameters such as focal lengths, radii of curvature, and center thicknesses, and a diaphragm placement to achieve a balanced aberration correction and large aperture, ensuring high imaging quality and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical imaging system is miniaturized to reduce product cost and conform to personalized design, then the size is reduced, but the image quality deteriorates
Solution Approach 1:
The optical imaging system is divided into seven separate lens elements with specific refractive powers arranged in sequence. Each lens element contributes to correcting specific aberrations, allowing the system to maintain high image quality while achieving miniaturization. The segmentation of optical functions across multiple elements enables compact design without sacrificing imaging performance.
Solution Approach 2:
The patent employs aspherical surfaces on multiple lens elements (first, second, third, fourth, fifth, sixth, and seventh lenses) to correct optical aberrations more effectively than spherical surfaces. The aspherical surfaces allow for better control of light paths in a compact configuration, enabling miniaturization while maintaining or improving image quality. Specific aspherical coefficients are optimized for each surface to achieve the desired correction.
2Illumination intensity
If the aperture is increased to improve imaging quality, then the light gathering ability is enhanced, but the system size increases
Solution Approach 1:
The patent optimizes multiple parameters including the aperture diameter (F-number between 1.4 and 2.0), focal lengths of individual lenses, spacing between elements, and aspherical surface coefficients. By carefully adjusting these parameters, the system achieves large aperture for improved light gathering and imaging quality while maintaining a compact overall size through optimized optical path design.
3Measurement precision
If complex lens structures are used to correct aberrations and improve image quality, then the imaging quality is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
The complex task of aberration correction is segmented across seven lens elements, each with specific refractive powers and aspherical surfaces. This distribution of optical functions allows for effective correction of various aberrations (spherical, coma, astigmatism, field curvature, distortion) while keeping individual lens elements relatively simple and manufacturable.
Solution Approach 2:
The patent provides specific parameter ranges and relationships (focal length ratios, spacing distances, aspherical coefficients) that define an optimized design space. These parameter specifications enable manufacturers to produce the system with controlled complexity, balancing imaging quality requirements with manufacturing feasibility and cost-effectiveness.
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 imaging quality, compact size, and cost-effectiveness by effectively correcting aberrations and optimizing lens parameters, making it suitable for portable electronic devices with improved manufacturability and performance.
Implementation Method 1
an optical imaging system, which sequentially includes, from an object side to an image side along an optical axis: a first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens with refractive powers
Implementation Method 2
an object-side surface of the first lens to the image-side surface of the seventh lens include at least one aspherical mirror surface
Data Source
AI summary
The disclosure provides an optical imaging system, which sequentially includes, from an object side to an image side along an optical axis: a first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens with refractive power; and a diaphragm arranged between the second lens and the third lens, wherein an effective focal length f1 of the first lens and a total effective focal length f of the optical imaging system meet 1.5<f1/f<3.0; and a radius of curvature R13 of an object-side surface of the seventh lens and a radius of curvature R14 of an image-side surface of the seventh lens meet 1.5<R13/R14<2.0.