Five-Element Optical Lens Assembly for Clear Long-Shot Imaging
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Solution Overview
Problem
Conventional compact optical systems with five-element lens structures fail to provide sufficient light converging ability and image quality, especially for long-shot scenes, due to unfavorable refractive power and surface shapes of lens elements, leading to poor image quality and inability to clearly image distant scenes.
Innovation Solution
A photographing optical lens assembly with five non-cemented lens elements, including a first lens with positive refractive power and convex surfaces, a second lens with negative refractive power and aspheric surfaces, a third lens with negative refractive power and inflection points, a fourth lens with positive refractive power and aspheric surfaces, and a fifth lens with negative refractive power and inflection points, optimized to satisfy specific relationships between focal lengths and axial distances to enhance light control and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional five-element lens structure is used, then the optical system can be compact, but the light converging ability and image quality are insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution among the five lens elements, setting specific focal length ratios (f1/f, f2/f, etc.) and axial distance relationships (T34/f, SD/TD) to achieve both compact size and high image quality. The aspheric surface parameters are also precisely controlled to correct aberrations while maintaining a compact form factor.
2Volume of moving object
If the first lens element has insufficient light converging ability, then the optical system can be compact, but long-shot scenes cannot be clearly imaged
Solution Approach 1:
The patent applies local quality by giving the first lens element specific local characteristics: a convex object-side surface with positive refractive power and an aspheric image-side surface. This localized optimization of the first lens element's light converging ability enables clear long-shot imaging while maintaining the overall compactness of the optical system.
3Volume of moving object
If the axial distances between lens elements are not optimized, then the optical system can be compact, but the optical paths cannot be properly controlled
Solution Approach 1:
The patent applies parameter changes by establishing specific relationships between axial distances and focal length (T34/f, SD/TD ratios) to optimize optical path control. These parameter optimizations ensure proper light ray control throughout the compact optical system, enabling both compact size and effective optical path management.
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 improves image quality by correcting aberrations, enhancing light converging ability, and maintaining image brightness and saturation, allowing for clear imaging of distant scenes while maintaining a compact size suitable for portable electronic devices.
Implementation Method 1
The first lens element with positive refractive power has a convex object-side surface
Implementation Method 2
an object-side surface and an image-side surface of the fourth lens element are aspheric. The fifth lens element with negative refractive power has a concave image-side surface, wherein an object-side surface and the image-side surface of the fifth lens element are aspheric
Data Source
AI summary
A photographing 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 with negative refractive power has a convex object-side surface and a concave image-side surface. The third lens element has refractive power. The fourth lens element has refractive power, and an object-side surface and an image-side surface thereof are aspheric. The fifth lens element with negative refractive power has a concave image-side surface, wherein an object-side surface and the image-side surface thereof are aspheric, and at least one of the object-side surface and the image-side surface thereof has at least one inflection point.