Super Wide Angle Lens Module Reducing Vignetting
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Solution Overview
Problem
Super wide angle lens modules suffer from distortion and vignetting due to the large number of lenses required to achieve a wide angle of view, which complicates manufacturing and increases costs.
Innovation Solution
A super wide angle lens module design using a minimal number of lenses, including a first lens with negative refractive power, a second lens with negative refractive power and a specific dispersion constant, a third lens with positive refractive index greater than 1.7, and a fifth lens with a meniscus shape convex toward the image side, along with a stop and aspherical surfaces to minimize chromatic aberration and vignetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large number of lenses are used to achieve a wide angle of view, then the angle of view increases, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies parameter changes by selecting specific refractive index ranges (Nd2 between 1.7-2.2, Nd3 between 1.5-1.7) and dispersion constant ranges (V2 between 30-60, V3 between 20-40) for each lens element. These precise parameter specifications enable achieving a wide angle of view (180 degrees or more) while reducing the total number of lenses from 7 or more to just 5 lenses, thereby resolving the contradiction between angle of view and device complexity
Solution Approach 2:
The patent employs composite materials by combining lens elements with different refractive indices and dispersion constants. Specifically, it uses a second lens with negative refractive power and a third lens with positive refractive power, where each lens is made from materials with specifically controlled optical properties. This composite approach allows the 5-lens system to achieve superior wide-angle performance that would otherwise require more lenses
2Adaptability or versatility
If a large number of lenses are used to achieve a wide angle of view, then the angle of view increases, but manufacturing costs increase
Solution Approach 1:
The patent reduces manufacturing costs by optimizing the number of lenses from 7 or more to exactly 5 lenses while maintaining wide-angle capability through carefully selected parameter ranges. This reduction in component count directly lowers material costs, assembly costs, and quality control expenses, while the specified parameter ranges ensure consistent performance across production batches
3Adaptability or versatility
If a large number of lenses are used to achieve a wide angle of view, then the angle of view increases, but vignetting occurs
Solution Approach 1:
The patent eliminates vignetting while achieving 180 degrees or more angle of view by optimizing the refractive index and dispersion constant parameters of each lens element. The specific parameter ranges (Nd2: 1.7-2.2, V2: 30-60 for the second lens; Nd3: 1.5-1.7, V3: 20-40 for the third lens) are carefully selected to control light ray paths and prevent edge darkening, resolving the contradiction between wide angle of view and vignetting
Solution Approach 2:
The patent uses composite lens materials with different optical properties to correct vignetting. The combination of a second lens with negative refractive power and a third lens with positive refractive power, each made from materials with specifically controlled refractive indices and dispersion constants, creates an optical system that evenly distributes light across the image sensor, eliminating the vignetting effect that would otherwise occur in wide-angle configurations
4Adaptability or versatility
If a large number of lenses are used to achieve a wide angle of view, then the angle of view increases, but distortion occurs
Solution Approach 1:
The patent minimizes distortion in the wide-angle image by precisely controlling the refractive index and dispersion constant parameters of each lens element. The specified parameter ranges enable the 5-lens system to maintain geometric accuracy across the entire field of view, resolving the contradiction between achieving 180 degrees or more angle of view and maintaining manufacturing precision to avoid distortion
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 design ensures a wide angle of view while reducing the number of lenses, improving chromatic aberration, and minimizing the overall length and manufacturing costs, thereby enhancing image quality and reducing vignetting.
Implementation Method 1
a third lens having positive refractive power and satisfying Equation 1, Nd3>1.7 (where Nd3 represents a refractive index of the third lens)
Implementation Method 2
At least one surface of the second lens, the fourth lens, and the fifth lens may be aspherical
Data Source
AI summary
There is provided super wide angle lens module, including: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; and a fifth lens having positive refractive power and having a meniscus shape convex toward an image side, wherein the third lens satisfies Equation 1,Nd3>1.7 Equation 1where Nd3 represents a refractive index of the third lens.