Five-Lens Infrared Module for Resolution and Illumination
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Solution Overview
Problem
Current infrared lens modules for mobile devices fail to meet consumer requirements in terms of resolution ratio and relative imaging illumination, despite advancements in 3D image sensing technology.
Innovation Solution
A lens module design comprising a sequence of lenses with specific refractive powers and aspherical surfaces, including a filter to allow only infrared light, which satisfies certain conditions to optimize imaging quality and correct aberrations, resulting in improved resolution and illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional infrared lens is used for mobile devices, then the device can perform basic 3D image sensing, but the resolution ratio and relative imaging illumination do not meet consumer requirements
Solution Approach 1:
The lens is divided into multiple lens elements (at least five lens elements) with different refractive powers and aspherical surfaces. Each lens element contributes to correcting specific aberrations and optimizing light distribution, thereby simultaneously improving resolution and illumination uniformity across the image field.
Solution Approach 2:
The patent employs aspherical surfaces on the lens elements instead of traditional spherical surfaces. The aspherical design allows for better control of light rays, reducing optical aberrations and improving both resolution and illumination distribution across the entire image field, particularly at the edges and corners.
2Measurement precision
If more lens elements are added to improve resolution, then imaging quality improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple lens elements with different functions (positive and negative refractive powers) are combined in a single integrated lens module. The design merges aberration correction, focus control, and illumination optimization into one compact structure, achieving high imaging quality without proportionally increasing overall complexity.
Solution Approach 2:
The patent optimizes specific parameters of the lens elements including refractive powers, aspherical surface coefficients, and relative positions. By carefully controlling these parameters, the design achieves superior imaging performance while maintaining a practical and manufacturable structure.
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 lens module achieves high resolution ratio and high relative imaging illumination, effectively addressing the limitations of existing infrared lens modules by ensuring proper power distribution and aberration correction.
Implementation Method 1
a first lens 10 having a negative refractive power, a second lens 20 having a positive refractive power, a third lens 30 having a positive refractive power, a fourth lens 40 having a positive refractive power, and a fifth lens 50 having a negative refractive power
Data Source
AI summary
A lens module includes a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, a fifth lens having a negative refractive power, and an imaging surface, arranged in that sequence from an object side to an image side. The lens module uses infrared light which has a wavelength ranging from 920 to 970 nm, the lens module satisfies the following conditions: 0.0002<|1/F1|<0.01; D/TTL>1.1; CT4/ET4<1.8; F1 denotes a focal length of the first lens, D denotes a diameter of a largest imaging circle of the lens module, TTL denotes a distance between an object side surface of the first lens to the imaging surface, CT4 denotes a central thickness of the fourth lens, ET4 denotes an edge thickness of the fourth lens.