Eighth-Lens Optical Imaging System for Compact Aberration Correction
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Solution Overview
Problem
The challenge is to design an optical imaging lens with good imaging quality while maintaining a compact size, as increasing the number of optical lenses leads to a longer system length, making it difficult to achieve both slimness and high imaging quality in portable devices like mobile phones and digital cameras.
Innovation Solution
The optical imaging lens is designed with a specific arrangement of lens elements, including a first to eighth lens element, where the second lens element has negative refracting power, and the surfaces of the lens elements have concave-convex shapes to correct spherical aberration and reduce distortion, allowing for a reduced system length while maintaining good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of optical lenses is increased to correct aberration and dispersion problems, then imaging quality is improved, but system length is increased
Solution Approach 1:
The optical system is divided into multiple lens elements (first through eighth lens elements) with different refracting powers and surface configurations. Each lens element contributes to correcting specific aberrations, allowing the system to achieve high imaging quality while maintaining a compact overall length through optimized segmentation of optical functions.
Solution Approach 2:
Different lens elements have locally optimized properties: the second lens element has negative refracting power for specific correction, the third lens element has a concave optical axis region on its image-side surface, the fourth lens element has concave optical axis region and convex periphery region, and the sixth lens element has concave periphery region. These localized quality variations enable effective aberration correction within a compact system.
2Length of stationary object
If the system length is reduced to achieve compactness, then portability is improved, but imaging quality may deteriorate
Solution Approach 1:
The patent employs parameter changes by assigning negative refracting power to the second lens element and creating specific concave and convex regions on various lens surfaces. These parameter variations enable the compact optical system to maintain effective aberration correction capabilities despite the reduced system length, ensuring high imaging quality in a portable form factor.
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
This design effectively corrects spherical and other aberrations, reduces distortion, and expands the field of view, enabling good imaging quality even with a shorter system length, thus addressing the challenge of compactness and image quality in portable devices.
Implementation Method 1
The second lens element has negative refracting power. An optical axis region of the image-side surface of the third lens element is concave. An optical axis region of the object-side surface of the fourth lens is concave, and a periphery region of the image-side surface of the fourth lens element is convex. A periphery region of the object-side surface of the sixth lens element is concave.
Data Source
AI summary
An optical imaging lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element from an object side to an image side in order along an optical axis. The first lens element to the eighth lens element each include an object-side surface facing the object side and an image-side surface facing the image side. Lens elements of the optical imaging lens are only the first, second, third, fourth, fifth, sixth, seventh and eighth lens elements. The periphery region of the image-side surface of the first lens element is concave. The optical axis region of the image-side surface of the seventh lens element is concave, and the periphery region of the image-side surface of the seventh lens element is convex.