Six-Element Lens Assembly with Inflection Point Surface
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Solution Overview
Problem
Conventional compact optical systems for mobile devices, such as smartphones and tablets, fail to meet the requirements of high resolution and image quality due to limitations in their five- or six-element lens structures, particularly with small air gaps that lead to assembly challenges and image quality issues.
Innovation Solution
A six-element photographing optical lens assembly with specific refractive powers and aspheric surfaces for each lens element, including a first lens with positive power, a second lens with negative power, and a sixth lens with a concave image-side surface having an inflection point, optimized to minimize air gaps and improve image quality by adjusting curvature radii and Abbe numbers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional five-element or six-element lens structure is used to maintain compact size, then the device can be miniaturized, but the image quality and resolution requirements cannot be satisfied
Solution Approach 1:
The optical system is divided into six distinct lens elements with different refractive powers and surface characteristics. Each lens element is designed to perform specific optical functions, allowing the system to achieve high image quality while maintaining compact size through functional segmentation of the optical path.
Solution Approach 2:
The patent applies specific parameter constraints including curvature radii (R8, R9, R10), inflection points on the sixth lens element, and refractive power distributions. By optimizing these parameters within defined ranges, the system achieves both compact dimensions and high image quality requirements.
2Volume of moving object
If the air gap between the first lens element and second lens element is made extremely small to maintain compact size, then the optical system remains miniaturized, but assembly becomes difficult and image quality deteriorates
Solution Approach 1:
The patent specifies different air gap requirements for different regions of the optical system. While the overall system remains compact, the air gap between the first and second lens elements is deliberately designed to be non-extremely small, providing sufficient space for assembly operations while maintaining the miniaturized character of the overall optical system.
3Volume of moving object
If the air gap between the first lens element and second lens element is made extremely small to maintain compact size, then the optical system remains miniaturized, but the first lens element contacts the second lens element leading to worse image quality
Solution Approach 1:
The patent ensures that the air gap between the first and second lens elements maintains a minimum distance that prevents contact between lens surfaces. This local quality control in the air gap region prevents lens element contact while preserving the compact overall size of the optical system.
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 enhances image quality, reduces aberrations, and maintains a compact size by optimizing the refractive powers and surface shapes of the lens elements, addressing the limitations of conventional systems and improving manufacturing yield.
Implementation Method 1
The first lens element has positive refractive power. The second lens element with negative refractive power... The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element has refractive power... The sixth lens element with refractive power...
Implementation Method 2
both of an object-side surface and an image-side surface of the fifth lens element are aspheric. both of an object-side surface and the image-side surface of the sixth lens element are aspheric
Data Source
AI summary
A photographing optical lens assembly includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has positive refractive power. The second lens element with negative refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The third lens element, the fourth lens element, the fifth lens element and the sixth lens element have refractive power. The sixth lens element has an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one inflection point. The photographing optical lens assembly has a total of six lens elements with refractive power.