Five-Element Mobile Lens Length Reduction via Air Gap Control
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Solution Overview
Problem
The challenge is to develop an optical imaging lens for mobile devices that is shorter in length while maintaining good optical characteristics, such as high resolution and system performance, to accommodate the trend of smaller mobile device sizes.
Innovation Solution
The optical imaging lens is designed with five lens elements, where the central thickness and air gaps between them are carefully controlled to achieve a shorter length, with specific refractive powers and surface curvatures, such as positive and negative refractive powers, and convex and concave surfaces, to optimize the lens's dimensions and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the length of the optical imaging lens is reduced to accommodate smaller mobile devices, then the size of the mobile device is reduced, but the optical characteristics such as resolution and system performance deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the central thickness of the second lens element (T2) and the sum of all air gaps (Gaa) to satisfy specific ratio relationships (0.15<T2/Gaa<0.35 and 0.25<T3/Gaa<0.45). This quantitative parameter optimization enables the lens to achieve a shortened length while maintaining good optical characteristics through mathematical relationship control among structural parameters.
Solution Approach 2:
The patent implements local quality by designing different surface curvatures and refractive powers for different lens elements. Specifically, the second lens element has a concave image-side curved surface with negative refractive power, while the third lens element has a convex periphery on the object side and convex periphery on the image side. These localized structural optimizations allow each lens element to contribute differently to overall optical performance while maintaining compact dimensions.
2Length of stationary object
If the central thickness of lens elements and air gaps are reduced to shorten the lens length, then the lens becomes more compact, but the optical performance and resolution may be compromised
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing specific ratio relationships between the central thickness of lens elements (T2, T3) and the sum of air gaps (Gaa). The controlled ratios (0.15<T2/Gaa<0.35 and 0.25<T3/Gaa<0.45) ensure that thickness and air gap dimensions are optimized together, allowing the lens to achieve compact length while maintaining sufficient optical path and focal properties for reliable optical performance.
Solution Approach 2:
The patent applies dynamics by optimizing the distribution and proportion of different structural components (lens element thicknesses and air gaps) rather than uniformly reducing all dimensions. The dynamic balance between solid lens material and air gaps, governed by the ratio relationships, creates an optimized structural distribution that maintains optical reliability while achieving length reduction.
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 length of the optical imaging lens while preserving good optical characteristics, ensuring high resolution and system performance, making it suitable for smaller mobile devices.
Implementation Method 1
The first lens element has positive refractive power and comprises a convex object-side curved surface. The second lens element has negative refractive power and comprises a concave image-side curved surface.
Data Source
AI summary
Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises five lens elements positioned in an order from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements to allow the thickness of the second lens element and air gaps between the five lens elements along the optical axis satisfying the relation 4.11≦f/(AG12+AG45)≦17.06, where f is the effective focal length of the optical imaging lens, AG12 is the air gap between the first and second lens element along the optical axis, and AG45 is the air gap between the fourth and fifth lens element along the optical axis. The optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.