Five-Piece Aspheric Lens System for Compact Mobile Imaging
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Solution Overview
Problem
Conventional miniaturized optical lens systems with four lens elements fail to meet the increasing demands for higher resolution, wide field of view, and compact size in modern electronic devices, particularly in mobile phone cameras with smaller pixel sizes.
Innovation Solution
A five-piece optical lens system is designed with specific refractive powers and surface shapes for each lens element, including aspheric surfaces, and a stop placement to optimize chromatic aberration correction and image quality, while maintaining a short total track length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a four-piece optical lens system is used for miniaturization, then the total track length is reduced, but the resolution and image quality deteriorate
Solution Approach 1:
The optical lens system is divided into five distinct lens elements with specific refractive powers and surface curvatures, allowing each element to contribute differently to the overall optical performance. This segmentation enables better control of aberrations and improved resolution while maintaining a compact form factor suitable for mobile phone cameras.
2Measurement precision
If more lens elements are added to improve resolution, then the image quality improves, but the total track length increases
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element including refractive index (N1, N2, N3, N4, N5), Abbe numbers (V1, V2, V3, V4, V5), surface curvatures (R1 through R10), thicknesses (d1 through d6), and focal lengths (f1 through f5). These controlled parameter changes enable optimization of both resolution and compactness by carefully balancing the optical properties of each element.
Solution Approach 2:
The five lens elements are arranged in a nested configuration where each subsequent element builds upon the optical function of the previous ones. The stop is strategically positioned within this nested structure to control aperture and aberrations. This nested arrangement maximizes optical performance within a minimized total track length.
3Volume of moving object
If the pixel size of electronic imaging sensor is reduced for miniaturization, then the device size is reduced, but the required image quality and resolution increase
Solution Approach 1:
Different regions of the optical system are optimized with specific local qualities: the first lens element has a convex object-side surface for broad light gathering, while subsequent elements have varying concave and convex surfaces tailored to correct specific aberrations. The aspheric surfaces in certain elements provide localized quality enhancement for off-axis rays, ensuring high image quality across the entire sensor area despite reduced pixel size.
4Measurement precision
If aspheric surfaces are used to improve image quality and reduce aberrations, then the manufacturing complexity increases
Solution Approach 1:
Instead of making all lens elements aspheric, the patent applies aspheric surfaces selectively to specific elements where they provide the most benefit for aberration correction. This partial application of aspheric design achieves the necessary image quality improvement while limiting the increase in manufacturing complexity to only the critical elements.
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 five-piece optical lens system achieves improved resolution, wide field of view, and compact size, effectively addressing the limitations of four-piece systems by enhancing image quality and reducing aberrations, while maintaining a low height and short total track length.
Implementation Method 1
a first lens element with a positive refractive power having a convex object-side surface, at least one of the object-side and an image-side surfaces of the first lens element being aspheric
Implementation Method 2
a five-piece optical lens system comprises, in order from the object side to the image side
Data Source
AI summary
A five-piece optical lens system includes, in order from the object side to the image side: a first lens element with a positive refractive power having a convex object-side surface and at least one aspheric surface; a second lens element with a negative refractive power having a concave image-side surface and at least one aspheric surface; a third lens element with a positive refractive power having at least one aspheric surface; a fourth lens element with a positive refractive power having a concave object-side surface and a convex image-side surface, and at least one aspheric surface; a fifth lens element with a negative refractive power having a concave image-side surface and at least one aspheric surface. Thereby, such a system not only can be applied to a high resolution mobile phone, but also has a wide field of view, big stop, high pixel, high resolution and low height.