Eight-Element Optical Imaging Lens Compact Design
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Solution Overview
Problem
The challenge is to design an optical imaging lens with high image quality and small size, which is not achievable by simply scaling down existing lenses, as this results in increased chromatic aberrations and dispersion, making it difficult for applications in compact devices like mobile phones and cameras.
Innovation Solution
The optical imaging lens is designed with eight lens elements, where the convex or concave shape of the surfaces is controlled to shorten the lens length while maintaining good optical characteristics, using specific parameters such as air gaps and refractive indices to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of optical lenses is increased to eliminate chromatic aberrations and improve image quality, then image quality is improved, but the distance from the object-side surface of the first lens element to the image plane along the optical axis becomes larger
Solution Approach 1:
The patent applies nesting by placing multiple lens elements (eight in total) in a compact stacked arrangement along the optical axis. Each lens element is positioned closely with controlled air gaps, creating a nested structure that maximizes optical functionality within a minimized overall length. This nested configuration allows chromatic aberration correction through multiple elements while keeping the total optical axis length short.
Solution Approach 2:
The patent utilizes parameter changes by carefully selecting and varying the refractive indices and Abbe numbers of different lens elements. By optimizing these optical parameters for each element, the design achieves effective chromatic aberration correction and high image quality. The specific parameter ranges (e.g., refractive index between 1.45-1.90, Abbe number between 20-60) enable compact element design that reduces overall length while maintaining optical performance.
2Length of stationary object
If the dimensions of the optical lens are scaled down to reduce size, then the size is reduced, but chromatic aberrations and dispersion increase
Solution Approach 1:
The patent applies segmentation by dividing the optical system into eight distinct lens elements rather than using a single scaled-down lens. Each element is optimized for specific optical functions, with varying refractive indices and surface curvatures. This segmentation allows the compact overall size to be achieved while each element contributes to correcting chromatic aberrations and dispersion, preventing the quality degradation that would occur with simple scaling.
Solution Approach 2:
The patent employs composite material principles by combining lens elements made from different optical materials with distinct refractive indices and dispersion characteristics. This composite approach enables the compact lens assembly to correct chromatic aberrations through material diversity, where each material is selected to complement the others in minimizing dispersion effects while maintaining small overall dimensions.
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 approach allows for a compact optical imaging lens with improved image quality and reduced aberrations, effectively addressing the limitations of scaling down existing designs and enhancing performance in consumer electronic devices.
Implementation Method 1
The first lens element to the eighth lens element may each comprise an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing the imaging rays to pass through
Data Source
AI summary
An optical imaging lens may include eight lens elements positioned in an order from an object side to an image side. Through designing concave and/or convex surfaces of the eight lens elements, the optical imaging lens may provide improved imaging quality and optical characteristics while the total length of the optical imaging lens may be shortened.