Five-Element Aspheric Lens System for Aberration Correction
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Solution Overview
Problem
Conventional compact optical systems with four-element or five-element lens structures fail to meet the requirements for high image quality and effective aberration correction, particularly in portable electronic devices, due to unbalanced refractive power and inadequate correction of chromatic and spherical aberrations.
Innovation Solution
An image capturing lens system comprising five lens elements with specific refractive powers and surface configurations, including aspheric surfaces, that satisfy conditions for balanced refractive power, aberration correction, and reduced total track length, featuring a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with a concave image-side surface and inflection points, and a fifth lens with a concave image-side surface and inflection points, ensuring effective chromatic and spherical aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional four-element lens structure is used, then the device complexity is reduced, but the image quality and aberration correction ability deteriorate
Solution Approach 1:
The patent divides the optical system into five distinct lens elements with specific refractive power distributions. Each lens element is designed with particular surface curvatures and aspheric coefficients to independently correct specific types of aberrations, achieving superior image quality through segmented functional design
Solution Approach 2:
Different regions of the lens surfaces are designed with varying properties - the patent specifies different curvature radii for object-side and image-side surfaces of each lens element, and applies aspheric surfaces with specific coefficients to local regions to correct spherical aberration and other distortions non-uniformly across the optical field
2Manufacturing precision
If a five-element lens structure is used to enhance image quality, then the image quality improves, but the refractive power becomes unbalanced leading to poor aberration correction
Solution Approach 1:
The patent precisely controls and optimizes key parameters including the refractive power of each lens element (with specific focal length relationships), the curvature radii of lens surfaces, and aspheric coefficients. These parameter changes ensure balanced refractive power distribution and effective correction of both chromatic and spherical aberrations
Solution Approach 2:
The patent employs a composite lens structure where five different lens elements with varying refractive powers and material properties are combined. Each element contributes differently to the overall optical performance, with specific elements designed to correct different types of aberrations through their unique refractive characteristics
3Reliability
If more lens elements are added to improve aberration correction, then the aberration correction ability improves, but the total track length increases
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements instead of traditional spherical surfaces. This curvature design allows for more compact lens spacing while maintaining effective aberration correction, reducing the total track length by eliminating the need for additional spacing that would be required with spherical surfaces
Solution Approach 2:
The five lens elements are arranged in a compact nested configuration where each element is positioned closely to the next, with optimized air gaps between elements. This nested arrangement maximizes the use of available space while maintaining the required optical path length for effective aberration correction
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, balanced refractive powers, and enhanced aberration correction, enabling high-resolution imaging in compact optical systems for portable devices, such as digital cameras and mobile devices.
Implementation Method 1
The fourth lens element with refractive power has a concave image-side surface in a paraxial region thereof, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric. The fifth lens element with refractive power has a concave image-side surface in a paraxial region thereof, wherein the image-side surface of the fifth lens element has at least one inflection point, and the object-side surface and the image-side surface of the fifth lens element are aspheric.
Implementation Method 2
the image-side surface of the fifth lens element has at least one inflection point
Data Source
AI summary
An image capturing lens system includes five lens elements with refractive power, 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 positive refractive power. The third lens element has negative refractive power. The fourth lens element with refractive power has a concave image-side surface in a paraxial region thereof, wherein the surfaces thereof are aspheric. The fifth lens element with refractive power has a concave image-side surface in a paraxial region thereof, wherein the image-side surface of the fifth lens element has at least one inflection point, and the surfaces thereof are aspheric.