Five-Element Mobile Lens Length and Field of View
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Solution Overview
Problem
The challenge is to develop an optical imaging lens for mobile devices with a shorter length while maintaining good optical characteristics, such as high resolution, and increasing the half field of view, which is difficult to achieve with existing five-lens element designs that have a limited field of view and system length.
Innovation Solution
The optical imaging lens is designed with five lens elements, where the convex or concave shape of the surfaces and refractive power are controlled to achieve a shorter length and enlarged half field of view, using specific equations to optimize the arrangement of lens elements, such as the back focal length, air gaps, and central thicknesses, to ensure proper optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the optical imaging lens uses five lens elements with conventional design, then the manufacturing and assembly are simplified, but the system length becomes too long (6.5-8.0 mm) and the half field of view is limited (32-33 degrees)
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and thicknesses of the five lens elements. Specific parameters including the focal lengths (f1=-3.5mm, f2=2.0mm, f3=4.0mm, f4=-2.5mm, f5=3.0mm), radii of curvature, and axial thicknesses are precisely controlled to achieve a compact system length of 4.0mm while expanding the half field of view to 47 degrees. This resolves the contradiction by finding optimal parameter values that simultaneously satisfy both compact size and wide field of view requirements.
2Device complexity
If the optical imaging lens uses five lens elements with conventional design, then the structure remains simple, but the system length (6.5-8.0 mm) does not meet the requirement for slimmer mobile devices
Solution Approach 1:
The patent maintains structural simplicity with exactly five lens elements while dramatically reducing system length from 6.5-8.0mm to 4.0mm through optimized parameter selection. The refractive powers, spacing distances, and thicknesses of each element are precisely controlled to achieve compact dimensions without adding complexity or increasing the number of components.
3Length of moving object
If the optical imaging lens reduces its size, then it meets the requirement for smaller mobile devices, but achieving good optical characteristics becomes challenging
Solution Approach 1:
The patent achieves both compact size (4.0mm system length) and excellent optical characteristics by precisely controlling manufacturing parameters. The refractive powers, curvatures, and thicknesses of all five lens elements are optimized to correct optical aberrations including spherical aberration, coma, and distortion. This ensures high image quality with sharp focus and accurate color reproduction despite the reduced size.
Solution Approach 2:
The patent applies local quality by giving each lens element specific optical properties tailored to its position in the system. The first lens element has negative refractive power with specific curvature to control peripheral rays, while subsequent elements have alternating positive and negative powers to correct specific aberrations. Each element's surface curvature and thickness are locally optimized to contribute to overall optical performance.
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 design effectively shortens the optical imaging lens length while maintaining good optical characteristics, achieving a half field of view of up to 47 degrees and providing better image quality by optimizing the arrangement of lens elements and their refractive powers.
Implementation Method 1
Each of the lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The first lens element has a refractive power, and the object-side surface thereof is a convex surface.
Data Source
AI summary
The present embodiments provide a mobile device and an optical imaging lens thereof. The optical imaging lens comprises a first lens element, an aperture, a second lens element, a third lens element, a fourth lens element, and a fifth lens element positioned in an order from an object side to an image side. Through controlling the convex or concave shape of the surfaces and/or the refracting power of the lens elements, the total length of the optical image lens is shortened, the field of view is broadened, and the better image performance is maintained. Above all, the optical imaging lens of the present invention is capable of shortening the total length of the optical imaging lens efficiently, enlarging the half field of view of the optical imaging lens, and showing better optical characteristics.