Five-Element Optical Imaging Lens Set for Compact Portable Devices
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Solution Overview
Problem
Current optical imaging lens sets for portable electronic devices face challenges in minimizing system length while maintaining sufficient optical performance and image quality, as existing designs often result in suboptimal imaging results and increased production costs.
Innovation Solution
The proposed optical imaging lens set consists of five lens elements with specific surface configurations and air gaps, including a convex first image-side surface, convex second object-side surface, concave third object-side surface, positive refractive power fourth lens element, and concave fifth image-side surface, optimized to achieve reduced length and high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the optical imaging lens set uses conventional lens configurations with concave surfaces, then the system length increases to 10mm-18mm, but the imaging quality deteriorates
Solution Approach 1:
The patent applies parameter changes by inverting the surface curvature configuration of lens elements. Specifically, the first lens element has a convex image-side surface instead of concave, and the second lens element has a concave object-side surface instead of convex. This parameter inversion allows the lens set to achieve compact length (5.23mm) while maintaining good imaging quality by optimizing the light path and reducing aberrations.
2Length of moving object
If the fifth lens element is made convex, then the total length may be reduced, but the imaging quality becomes insufficient
Solution Approach 1:
The patent applies local quality by giving each lens element specific surface configurations tailored to its position in the optical system. The fifth lens element has a convex object-side surface and a concave image-side surface, creating a meniscus shape that is optimized for its specific role in the optical path. This localized optimization of surface geometry allows the element to contribute to both compact length and high imaging quality.
3Manufacturing precision
If the air gap between lens elements is increased, then the imaging quality may improve, but the system length increases
Solution Approach 1:
The patent applies dynamics by optimizing the air gaps between lens elements to specific ranges that balance imaging quality and compactness. The air gap between the first and second lens elements is controlled at 0.2mm-0.5mm, and the air gap between the fourth and fifth lens elements is controlled at 0.1mm-0.3mm. These dynamic optimizations allow sufficient light path for quality imaging while maintaining the overall system length at just 5.23mm.
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 enhances imaging results by minimizing aberrations and distortion, achieving better optical performance with a shorter system length, suitable for compact portable electronic devices while reducing production costs.
Implementation Method 1
The optical imaging lens set includes five lens elements with specific refractive powers and surface configurations (convex and concave surfaces) that refract light to focus images on the image sensor while minimizing optical aberrations
Data Source
AI summary
An optical imaging lens set from an object side toward an image side along an optical axis in order includes: a first lens element having an image-side surface with a convex portion in a vicinity of its circular periphery, a second lens element having an object-side surface with a convex portion in a vicinity of its optical axis, a third lens element having an object-side surface with a concave portion in a vicinity of its optical axis, a fourth lens element with positive refractive power, and a plastic fifth lens element having an image-side surface with a concave portion in a vicinity of its optical axis.