Five-Element Mobile Lens Length Reduction via Parameter Control
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Solution Overview
Problem
The challenge in developing optical imaging lenses for mobile devices is to achieve a shorter length while maintaining good optical characteristics, such as high resolution, which is essential for smaller-sized mobile devices like cell phones and digital cameras.
Innovation Solution
The optical imaging lens is designed with five lens elements, where the convex or concave shape and refracting power of the surfaces are controlled to shorten the lens length, with specific parameters like air gaps and central thicknesses optimized to satisfy certain equations, ensuring effective light convergence and aberration reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical imaging lens is designed with traditional five lens elements, then the optical characteristics can be maintained, but the length of the lens becomes excessive and unfavorable for smaller mobile devices
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices, curvatures, and thicknesses of the five lens elements. Specific parameters are defined within certain ranges (e.g., refractive index of first lens element between 1.50-1.70, curvature radii within specific values) to optimize the optical path and reduce the overall lens length while maintaining imaging quality
Solution Approach 2:
The optical imaging lens is segmented into five distinct lens elements with specific functions. Each lens element (first through fifth) has designated positive or negative refractive powers and specific surface curvature characteristics, allowing the system to distribute optical functions across multiple segments to achieve compact design
2Reliability
If the fifth lens element is made thicker to improve optical performance, then the imaging quality can be enhanced, but the overall length of the imaging lens increases
Solution Approach 1:
The patent defines the thickness of the fifth lens element within a specific range (0.10mm < T5 ≤ 0.30mm) and establishes relationships between T5 and other parameters (e.g., T5/T4 ratio, T5/BFL ratio) to achieve optimal imaging quality without excessive thickness, thereby controlling the overall lens length
3Reliability
If the air gaps between lens elements are increased to improve optical characteristics, then the imaging performance can be enhanced, but the sum of all air gaps becomes excessive and increases lens length
Solution Approach 1:
The patent establishes specific relationships and ranges for air gaps between lens elements (e.g., 0.02mm ≤ G12 < 0.08mm, 0.01mm ≤ G23 < 0.06mm, etc.) and defines the sum of all air gaps within a controlled range (0.05mm < Gaa ≤ 0.20mm) to balance imaging performance with compact lens length
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 sustaining good optical characteristics, enhancing system functionality and resolution, making it suitable for smaller mobile devices.
Implementation Method 1
the first lens element has a positive refracting power, and the object-side surface thereof is a convex surface; the second lens element has a negative refracting power; the third lens element has a positive refracting power
Data Source
AI summary
An optical imaging lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, and a fifth lens element sequentially arranged along an optical axis from an object side to an image side. Each of the first lens element to the fifth lens element has an object-side surface facing toward the object side and an image-side surface facing toward the image side. A distance between the image-side surface of the fifth lens element and an image plane along the optical axis is BFL, an air gap between the first lens element and the second lens element along the optical axis is G12, an air gap between the fourth lens element and the fifth lens element along the optical axis is G45, a central thickness of the fifth lens element along the optical axis is T5, satisfying the equation: 1.861≤(BFL+G12)/(G45+T5)≤3.055.