Five-Lens Imaging Optical Assembly with Inflection Points
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Solution Overview
Problem
Conventional miniaturized optical lens systems for electronic devices face challenges in achieving high resolution, short track length, and low distortion while maintaining compact size, leading to reduced image quality and production yield.
Innovation Solution
An imaging optical lens assembly comprising five lens elements with specific refractive powers and aspheric surfaces, including a plastic fifth lens element with carefully controlled inflection points and curvature ratios, optimized to minimize total track length and correct aberrations, is proposed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional triplet lens system (three lens elements) is used, then the structure is compact, but the image quality and resolution are insufficient
Solution Approach 1:
The optical system is divided into five distinct lens elements with specific refractive powers (first: positive, second: negative, third: positive, fourth: negative, fifth: positive), allowing each element to correct specific aberrations and collectively achieve superior image quality that cannot be obtained with fewer elements
Solution Approach 2:
Each lens element is designed with specific local characteristics including aspheric surfaces with different curvature radii and inflection points positioned at specific locations to correct local optical aberrations in different regions of the optical path
2Volume of moving object
If the lens system is miniaturized for portable devices, then the device size is reduced, but the track length increases and image quality deteriorates
Solution Approach 1:
Aspheric surfaces are employed on multiple lens elements with specifically designed curvature radii and inflection points, enabling compact lens element shapes that reduce overall track length while maintaining correction of spherical aberration and other optical defects
Solution Approach 2:
The lens system utilizes plastic materials with specific refractive indices and Abbe numbers, combined with optimized curvature radii and thickness parameters, to achieve miniaturization while maintaining optical performance and reducing track length compared to conventional glass lens systems
3Manufacturing precision
If more lens elements (four or five) are added to improve image quality, then the resolution and aberration correction are enhanced, but the lens size increases and miniaturization becomes difficult
Solution Approach 1:
Aspheric surfaces on all five lens elements enable more efficient light path control and aberration correction within a compact volume, allowing the system to achieve high image quality without proportionally increasing lens size
Solution Approach 2:
The system combines plastic lens materials with specific refractive indices and Abbe numbers to achieve both miniaturization and high image quality, leveraging the material properties to reduce lens element sizes while maintaining optical performance
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 solution effectively improves image quality by reducing astigmatism and distortion, allowing for a wider field of view and better peripheral light gathering, while maintaining a compact form factor suitable for portable electronic devices.
Implementation Method 1
a first lens element with a positive refractive power having an aspheric object-side surface and an aspheric image-side surface
Data Source
AI summary
An imaging optical lens assembly includes an aperture stop and an optical assembly, the optical assembly includes, in order from the object side to the image side: a first lens element with a positive refractive power; a second lens element with a refractive power; a third lens element with a refractive power; a fourth lens element with a refractive power; a fifth lens element with a negative refractive power having an image-side surface being convex near an optical axis; wherein the image-side surface of the fifth lens element is formed with at least two inflection points, including a first inflection point and a second inflection point further away from the optical axis, a vertical distance from the first inflection point to the optical axis is Y_inf1, a vertical distance from the second inflection point to the optical axis is Y_inf2, satisfying: 1.7<Y_inf2/Y_inf1<2.1.