Five-Lens Image Capturing System with Aspheric Inflection Points
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Solution Overview
Problem
Conventional compact optical lens systems for mobile electronic products face challenges in achieving excellent image quality while maintaining a short total track length and high image quality, particularly in portable devices with high pixel and image-quality requirements.
Innovation Solution
The proposed image capturing system consists of five independent and non-cemented lens elements with specific refractive powers and surface shapes, including aspheric surfaces and inflection points, which optimize image quality and reduce total track length by correcting aberrations and maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-element lens structure is used, then the device complexity is reduced, but the image quality and resolving power cannot satisfy high-end requirements
Solution Approach 1:
The patent divides the optical system into five independent lens elements instead of using a conventional four-element structure. This segmentation allows each element to be optimized for specific aberration correction, thereby improving overall image quality while maintaining manageable complexity through modular design
Solution Approach 2:
The patent applies aspheric surfaces to specific lens elements (fourth and fifth elements) rather than making all surfaces aspheric. This localized application of complex geometry provides targeted aberration correction where needed, improving image quality without unnecessarily increasing manufacturing complexity across the entire system
2Manufacturing precision
If a five-element lens structure is used, then image quality and resolving power are enhanced, but the total track length cannot be reduced easily
Solution Approach 1:
The patent optimizes the refractive indices and Abbe numbers of the five lens elements to achieve a balance between image quality and compactness. By carefully selecting optical parameters (refractive power distribution, dispersion characteristics), the system achieves excellent imaging performance with a reduced total track length of 3.45mm
Solution Approach 2:
The patent employs aspheric surfaces on the fourth and fifth lens elements to correct aberrations more effectively than spherical surfaces. This allows for better image quality with fewer elements and a more compact overall length, as aspheric profiles provide superior aberration control per unit length
3Length of moving object
If the total track length is reduced for compact size, then the device becomes more suitable for ultra-thin products, but image quality may deteriorate
Solution Approach 1:
The patent uses inflection points on the aspheric surfaces of the fourth and fifth lens elements to dynamically adjust the optical path. These inflection points allow for precise control of light ray trajectories, enabling effective aberration correction within the constrained 3.45mm total track length while maintaining excellent image quality
Solution Approach 2:
The patent arranges the five lens elements in a compact nested configuration where each element is positioned to maximize its optical effectiveness within the limited axial space. This nested layout allows the system to achieve full optical performance in a minimized total track length
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
This configuration enables the production of an optical lens system with improved image quality, reduced total track length, and enhanced manufacturing efficiency, suitable for ultra-thin electronic products with a larger field of view and compact size.
Implementation Method 1
The fourth lens element with negative refractive power has a concave object-side surface and a convex image-side surface, wherein at least one of the object-side surface and the image-side surface of the fourth lens element is aspheric
Implementation Method 2
at least one of the object-side surface and the image-side surface of the fourth lens element is aspheric
Implementation Method 3
The fifth lens element with refractive power has a concave image-side surface, wherein at least one of an object-side surface and the image-side surface of the fifth lens element is aspheric, and the fifth lens element has at least one inflection point on the image-side surface thereof
Implementation Method 4
The first through fifth lens elements are five independent and non-cemented lens elements
Implementation Method 5
an axial distance between the object-side surface of the first lens element and an image plane is TTL, and a focal length of the image capturing system is f
Data Source
AI summary
An image capturing system 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 has positive refractive power. The fourth lens element with negative refractive power has a concave object-side surface and a convex image-side surface, wherein at least one of the object-side surface and the image-side surface of the fourth lens element is aspheric. The fifth lens element with refractive power has a concave image-side surface, wherein at least one of an object-side surface and the image-side surface of the fifth lens element is aspheric, and the fifth lens element has at least one inflection point on the image-side surface thereof.