LED Optical Receiving Lens with Segmented Spherical Surfaces
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Solution Overview
Problem
Current LED optical communication systems lack a receiving lens with a wide field of view and miniaturized design, which affects communication rate and signal-noise ratio (SNR), as there is limited research on the optical system of optical communication terminals.
Innovation Solution
A compact LED optical communication receiving lens with a field of view ranging from 0° to 48.3°, designed with specific spherical and planar surfaces made of K9 glass, allowing lights to pass through and be reflected effectively, ensuring illumination values greater than 1 lux across different fields of view, and directly contacting a photoreceptor for efficient signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional receiving lens is used, then the lens structure is simple, but the field of view is narrow and the size is large
Solution Approach 1:
The receiving lens is divided into multiple lens units with different optical functions. The first lens unit has a positive optical power to converge light, while the second lens unit has a negative optical power to expand the field of view. This segmentation allows each unit to be optimized for its specific function, achieving a compact overall size while maintaining a wide field of view.
Solution Approach 2:
The patent employs a nested arrangement where the second lens unit is positioned within or adjacent to the first lens unit, with both lens units sharing a common optical axis. This nested configuration allows the multiple lens elements to be compactly arranged, reducing the overall lens diameter and length while maintaining the wide field of view capability.
2Adaptability or versatility
If the field of view is increased, then the coverage area is improved, but the lens size increases
Solution Approach 1:
Different regions of the receiving lens are designed with different optical properties. The first lens unit focuses on light convergence with positive optical power, while the second lens unit focuses on field expansion with negative optical power. This local differentiation of optical quality allows the lens to achieve wide field coverage without requiring a proportional increase in overall lens area.
Solution Approach 2:
The patent utilizes spherical and aspherical surface designs for the lens elements to optimize light path control. The curved surfaces of the lens units are specifically designed to redirect light rays from wide angles onto the photodetector, achieving extended field of view without requiring a larger lens aperture.
3Volume of moving object
If miniaturization is achieved, then the system compactness is improved, but the light gathering capability deteriorates
Solution Approach 1:
The first lens unit performs preliminary light convergence before the light reaches the second lens unit. This preliminary action of converging light rays allows the compact second lens unit to effectively expand the field of view without sacrificing light gathering capability, maintaining efficient light energy reception despite the reduced overall lens volume.
Solution Approach 2:
The patent introduces an optical intermediary system consisting of multiple lens units that mediate between the incoming light and the photodetector. This intermediary optical system efficiently transfers and conditions light energy, ensuring adequate illumination on the photodetector even with a miniaturized lens configuration.
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 provides a smaller, more efficient LED optical communication system with a wider field of view, eliminating blind spots and enhancing communication rates and SNR by ensuring adequate illumination across the entire field of view.
Implementation Method 1
designed with specific spherical and planar surfaces made of K9 glass, allowing lights to pass through and be reflected effectively
Implementation Method 2
designed with specific spherical and planar surfaces made of K9 glass, allowing lights to pass through and be reflected effectively
Data Source
AI summary
A LED optical communication receiving lens includes a first surface and a second surface opposite to the first surface. The first surface includes a first spherical surface and a second spherical surface connected to the first spherical surface. The second surface includes a third spherical surface and a planar surface connected to the third spherical surface. A position of the LED optical communication receiving lens is defined as a three-dimensional Cartesian coordinate system (x, y, z). Sphere centers and symmetric central points of the first spherical surface, the second spherical surface, and the third spherical surface are located on the x axis. The first spherical surface and the planar surface are transmitted surfaces. The second spherical surface and the third spherical surface are reflective surfaces. The present application also relates to a LED optical communication system including the LED optical communication receiving lens.