Five-Element Aspheric Lens Assembly for Compact Mobile Imaging
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Solution Overview
Problem
Conventional compact image lens assemblies, whether with four or five lens elements, fail to meet the increasing demands for higher image quality and miniaturization in portable electronic devices, particularly due to limitations in refractive power distribution and aberration correction.
Innovation Solution
A compact image lens assembly comprising five independent and non-cemented lens elements, with specific refractive powers and surface curvatures, including aspheric surfaces, to optimize image quality and reduce total track length, featuring a first lens with positive refractive power, a second with negative power, a third and fourth with plastic materials and aspheric surfaces, and a fifth with positive refractive power and inflection points, along with a stop to balance telecentric and wide-angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four lens elements structure is adopted, then the device complexity is reduced, but the image quality and resolving power cannot satisfy the requirements of high specification mobile products
Solution Approach 1:
The patent divides the optical system into five independent lens elements instead of four, with each element having specific refractive powers and surface curvatures. This segmentation allows for better correction of optical aberrations and improved image quality while maintaining compact dimensions suitable for mobile devices.
Solution Approach 2:
Different regions of the lens elements have different surface curvatures and refractive powers optimized for their specific functions. The object-side and image-side surfaces of each lens element are designed with specific curvature radii to address local optical requirements, such as reducing distortion at the periphery while maintaining sharpness at the center.
2Object-affected harmful factors
If the fifth lens element has a concave object-side surface, then the device complexity is reduced, but the angle of incident light on the peripheral region cannot be reduced, restricting photosensitivity and leading to image noise
Solution Approach 1:
The fifth lens element is designed with a convex object-side surface and a convex image-side surface, both with specific curvature radii. This parameter change from the conventional concave design allows for better control of incident light angles, reducing the angle of incident light on the peripheral region and improving photosensitivity to reduce image noise.
Solution Approach 2:
The lens elements, particularly the fifth element, utilize aspheric surfaces with specific curvature radii to optimize light path control. The convex curvature of the object-side surface of the fifth lens element helps to reduce the angle of incident light on the peripheral region, improving image quality and reducing noise.
3Volume of moving object
If the total track length is reduced for miniaturization, then the volume of the device is reduced, but the image quality and aberration correction may be compromised
Solution Approach 1:
The five lens elements are arranged in a compact sequence with optimized spacing between them, allowing the optical system to be nested within a small total track length. Each lens element is positioned at specific distances from the others to maximize optical performance within the constrained space, achieving both miniaturization and high image quality.
Solution Approach 2:
The patent optimizes multiple parameters including the total track length, focal length, and spacing between lens elements to achieve miniaturization. By carefully controlling these parameters while maintaining specific curvature radii and refractive powers, the system achieves compact dimensions without sacrificing image quality or aberration correction capabilities.
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 image noise, and maintains a compact size by effectively correcting aberrations and minimizing the total track length, while allowing for flexible design and cost-effective manufacturing using glass or plastic materials.
Implementation Method 1
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... The second lens element has negative refractive power
Data Source
AI summary
An image 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 refractive power is made of plastic material, and has at least one surface being aspheric. The fourth lens element with refractive power is made of plastic material, and has a concave object-side surface and a convex image-side surface, wherein at least one surface of the fourth lens element is aspheric. The fifth lens element with positive refractive power is made of plastic material, and has a convex object-side surface and a convex image-side surface, wherein at least one surface of the fifth lens element is aspheric.