Six-Element Optical Imaging Lens Compact Mobile Device Design
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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 size constraints.
Innovation Solution
Designing an optical imaging lens with six lens elements, where the convex or concave shape of surfaces and refractive power are controlled to satisfy specific inequalities, reducing the length while maintaining good optical characteristics, including the use of plastic materials for lens elements to enhance imaging quality and reduce production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical imaging lens with six lens elements is used to achieve high-quality imaging, then the imaging quality is improved, but the length of the lens becomes too long for smaller mobile devices
Solution Approach 1:
The patent applies parameter changes by precisely controlling the convex or concave shape of lens surfaces and optimizing design parameters such as focal lengths, refractive indices, and Abbe numbers of the six lens elements. By satisfying specific inequalities for these parameters, the lens achieves high imaging quality while reducing the overall length to under 21mm, resolving the contradiction between imaging quality and compact size
Solution Approach 2:
The patent utilizes composite material principles by selecting lens elements with different refractive indices and Abbe numbers (e.g., first lens element with n1=1.53-1.70 and v1=20-40, second lens element with n2=1.50-1.65 and v2=25-45) to correct optical aberrations. This composite approach allows the compact six-element design to achieve superior imaging quality that would otherwise require a longer lens configuration
2Reliability
If the number of lens elements is increased to improve optical characteristics, then the optical performance is improved, but the device complexity and production cost increase
Solution Approach 1:
The patent optimizes the complexity by establishing specific parameter ranges and inequalities for the six lens elements, including focal length ratios (0.30<f1/EFL<0.60, -0.40<f2/EFL<-0.15), thickness ratios (0.10<T1/EFL<T0.35, 0.15<T6/EFL<0.40), and air gap constraints (0.05<G12/EFL<0.30). These parameter optimizations enable the six-element design to achieve high optical performance with controlled complexity, avoiding the need for more elements while maintaining reliability
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 preserving excellent optical performance, improving imaging quality and reducing production complexity and costs, making it suitable for smaller mobile devices.
Implementation Method 1
an optical imaging lens having six lens elements, each of the first, second, third, fourth, fifth and sixth lens elements having refractive power
Data Source
AI summary
The present invention provides a mobile device and an optical imaging lens thereof. The optical imaging lens comprises six lens elements positioned in an order from an object side to an image side and an aperture stop positioned between the second and the third lens elements. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.