Five-Element Aspheric Lens Assembly for Compact Imaging
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Solution Overview
Problem
Conventional compact image capturing optical lens assemblies, particularly in portable electronic products, fail to meet the increasing demands for higher image quality and compact size due to limitations in the four-element lens structure.
Innovation Solution
A five-element non-cemented optical lens assembly with specific refractive power distributions and surface shapes, including aspheric surfaces, is designed to enhance image quality and reduce the total track length, utilizing plastic and glass materials to optimize refractive power and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-element lens structure is used, then the device complexity is low and ease of manufacture is good, but the image quality and total track length cannot satisfy high specification requirements
Solution Approach 1:
The patent divides the optical system into five separate lens elements instead of using a conventional four-element structure. This segmentation allows each element to be optimized for specific optical functions, improving overall image quality while maintaining manageable complexity through modular design
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements (first, third, fourth, and fifth elements) to correct optical aberrations more effectively than spherical surfaces. This curvature variation enables better control of light paths, improving image quality without proportionally increasing manufacturing complexity
2Length of moving object
If the total track length is reduced for compact size, then the portability is improved, but the image quality and optical performance may deteriorate
Solution Approach 1:
The patent optimizes specific parameter relationships including focal length ratios (f1/f2, f3/f, f4/f within 0.3-0.7), curvature radius ratios (R1/R2, R7/R8), and axial distance ratios (T12/T23, T34/T45). These parameter changes enable compact total track length while maintaining image quality through precise optical design
Solution Approach 2:
Aspheric surfaces on the lens elements enable more efficient light path control within a shorter axial distance. The non-spherical curvature allows for better aberration correction and focal point control, achieving high image quality in a compact form factor
3Manufacturing precision
If more lens elements are added to improve image quality, then the imaging performance is enhanced, but the total track length and device size increase
Solution Approach 1:
The patent establishes specific parameter constraints to control total track length: the ratio of axial distances between adjacent elements (T12/T23, T34/T45 between 0.2-0.8) and focal length ratios (f1/f2, f3/f, f4/f between 0.3-0.7). These parameter changes allow five elements to achieve high image quality without excessive length increase
Solution Approach 2:
The patent uses aspheric surfaces to control light paths in multiple dimensions, enabling more efficient use of optical space. This dimensional control allows compact arrangement of five lens elements while maintaining proper optical separation and focusing
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 achieves improved image quality, reduced total track length, and compact size, enabling the lens assembly to be used in lightweight and portable electronic products while maintaining desirable optical features.
Implementation Method 1
The first lens element with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The third lens element with positive refractive power has a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface of the third lens element is aspheric.
Implementation Method 2
an image capturing optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element
Data Source
AI summary
An image capturing optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The third lens element with positive refractive power has a convex object-side surface and a concave image-side surface. The fourth lens element with positive refractive power is made of plastic material, and has a concave object-side surface and a convex image-side surface. The fifth lens element with refractive power is made of plastic material, and has a convex image-side surface. At least one of the object-side surface and the image-side surface of the third lens element, the fourth lens element and the fifth lens element are aspheric.