Six-element optical imaging lens for mobile devices
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Solution Overview
Problem
Conventional optical imaging lenses with six elements are too long for smaller sized mobile devices, such as smartphones and digital cameras, while maintaining good optical characteristics is a challenge due to their limited length and complexity.
Innovation Solution
An optical imaging lens with six lens elements is designed, where the convex or concave shape of the surfaces is controlled to shorten the length while maintaining good optical characteristics, using specific refracting power and material properties, such as plastic construction for certain elements, and optimizing air gaps and thickness ratios to achieve improved imaging quality and reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an optical imaging lens with six lens elements is used to improve imaging quality and pixel count, then the imaging quality and pixel count increase, but the length of the optical imaging lens exceeds 21 mm making it too long for smaller sized mobile devices
Solution Approach 1:
The patent applies parameter changes by precisely controlling the convex or concave shape parameters of lens surfaces, specifically setting the central thickness T4 of the fourth lens element and the air gap G45 between the fourth and fifth lens elements to satisfy T4/G45 ≤ 2.8. This parameter optimization allows the lens to achieve good optical characteristics with a shortened overall length suitable for mobile devices
Solution Approach 2:
The patent utilizes curvature control by defining specific convex portions on the image-side surfaces of the first, third, and fourth lens elements, and concave portions on the object-side surface of the fifth lens element and image-side surface of the sixth lens element. This strategic use of spherical and aspherical surface curvatures enables compact lens design while maintaining imaging quality
2Length of moving object
If the length of the optical imaging lens is reduced to fit smaller mobile devices, then the device size decreases, but achieving good optical characteristics becomes challenging
Solution Approach 1:
The patent employs parameter changes by establishing specific relationships between lens element thickness and air gaps, particularly T4/G45 ≤ 2.8, and controlling the convex/concave shape parameters of various lens surfaces. These parameter optimizations enable the lens to maintain excellent optical characteristics despite the reduced overall length
Solution Approach 2:
The patent applies local quality by making different parts of the lens system have different properties - specifically, the fourth lens element uses plastic material with controlled thickness T4, while maintaining specific surface curvatures at different locations (convex portions at image-side surfaces of lenses 1, 3, 4 and concave portions at object-side surface of lens 5 and image-side surface of lens 6). This localized optimization achieves good optical characteristics in a compact design
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 solution effectively shortens the length of the optical imaging lens while maintaining excellent optical performance, including reduced aberrations and improved imaging quality, making it suitable for smaller mobile devices without increasing production complexity or costs.
Implementation Method 1
each of the first, second, third, fourth, fifth and sixth lens elements having refracting power
Data Source
AI summary
An optical imaging lens comprises first, second, third, fourth, fifth and sixth lens elements arranged sequentially from an object side to an image side along an optical axis. The object-side surface of the second lens element has a concave portion in the vicinity of a periphery of the second lens element, and the image-side surface of the second lens element has a concave portion in a vicinity of the optical axis. The image-side surface of the third lens element has a concave portion in the vicinity of a periphery of the third lens element. An effective focal length of the optical imaging lens is EFL, an air gap between the fourth lens element and the fifth lens element along the optical axis is G45, a central thickness of the sixth lens element along the optical axis is represented by T6, and EFL, G45 and T6 satisfy the equation:EFL/(G45+T6)≤6.40.