Seven-Lens Optical Imaging System Aberration Control
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Solution Overview
Problem
There is a challenge in implementing a high-resolution and high-performance camera in portable terminal devices due to size and weight constraints.
Innovation Solution
The optical imaging system consists of seven lenses sequentially disposed along an optical axis, with specific conditional expressions for focal lengths, refractive indices, and distances to optimize image quality and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to achieve high resolution, then image quality is improved, but device complexity increases
Solution Approach 1:
The optical system is divided into seven distinct lens elements with specific refractive indices and focal lengths. Each lens is designed with particular characteristics (e.g., first lens with positive refractive power, second and third lenses with negative refractive power) to segment the optical path and correct aberrations, achieving high resolution through coordinated action of individual lens components
Solution Approach 2:
The patent specifies precise parameter ranges for the optical system, including conditional expressions for focal lengths (f/f2+f/f3), refractive indices (n2+n3>3.15, n2+n3+n4>4.85), and Abbe numbers (v1-v2>30). These parameter optimizations enable the seven-lens system to achieve high resolution while controlling overall complexity through standardized design criteria
2Measurement precision
If glass materials are used for high refractive index lenses to improve resolution, then image quality is improved, but weight increases
Solution Approach 1:
The optical system employs a composite material strategy by combining plastic materials with glass materials. Specifically, the first, fourth, fifth, and seventh lenses are made of plastic with refractive indices of 1.6 or higher, while the second and third lenses use glass with refractive indices of 1.67 or higher. This composite approach achieves the necessary refractive power for high resolution while minimizing weight compared to using glass for all lenses
Solution Approach 2:
The patent specifies refractive index parameters to optimize the balance between weight and performance. The conditional expressions require that at least two lenses have refractive indices of 1.67 or higher, with specific assignments (second and third lenses: n2+n3>3.15; fourth lens: n2+n3+n4>4.85). These parameter constraints ensure sufficient optical power while using lighter plastic materials where possible
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 improved aberration properties and high resolution, enabling effective image capture despite size and weight limitations in portable devices.
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 disposed in ascending numerical order along an optical axis
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 disposed in ascending numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging surface of an image sensor, wherein a conditional expression f/f2+f/f3<−0.4 is satisfied, where f is a focal length of the optical imaging system, f2 is a focal length of the second lens, and f3 is a focal length of the third lens, and a conditional expression TTL/(2*IMG HT)<0.69 is satisfied, where TTL is a distance along the optical axis from an object-side surface of the first lens to the imaging surface of the image sensor, and IMG HT is one-half of a diagonal length of the imaging surface of the image sensor.