Lidar Light Receiving Module Wavelength Selective Mirror
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Solution Overview
Problem
Conventional LIDAR apparatuses face limitations in blocking optical noise without using bandpass filters, which reduces detection accuracy, and have complex structures due to reflective mirrors fixed inside barrels, lowering manufacturing efficiency.
Innovation Solution
A light receiving module with a reflective mirror having a dielectric coating for reflecting designed wavelengths and an anti-reflection coating for transmitting noise wavelengths, allowing the mirror to be fixed outside the barrel, thereby improving noise blocking efficiency and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bandpass filter is used to block optical noise, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts the noise blocking function from a separate bandpass filter component and integrates it into the reflective mirror through wavelength-selective reflective and transmissive layers. This eliminates the need for a standalone bandpass filter while maintaining noise blocking capability, thus improving detection accuracy without increasing device complexity.
Solution Approach 2:
The patent combines multiple functions into the reflective mirror: the mirror body provides reflective functionality while wavelength-selective layers provide noise blocking. By merging the noise filtering function with the reflective mirror, the patent reduces the number of components and simplifies the overall structure while maintaining detection accuracy.
2Manufacturing precision
If a reflective mirror is fixed inside a barrel, then optical axis control is improved, but manufacturing efficiency deteriorates
Solution Approach 1:
The patent segments the reflective mirror assembly into two independent parts: the mirror body with integrated wavelength-selective layers and the barrel. This allows the reflective mirror to be manufactured and tested separately, then easily installed into the barrel, improving manufacturing efficiency while maintaining optical axis control through precise mounting features.
Solution Approach 2:
The patent applies wavelength-selective reflective and transmissive layers to the mirror body in advance during manufacturing. This preliminary action allows the noise blocking functionality to be integrated into the mirror itself before installation, eliminating the need for complex assembly processes and improving manufacturing efficiency while ensuring proper optical alignment.
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
Enhances the blocking efficiency of optical noise without bandpass filters and simplifies the manufacturing process by allowing the reflective mirror to be fixed externally, improving the sensitivity and accuracy of the LIDAR apparatus.
Implementation Method 1
a reflective layer provided on the first surface to reflect light in a designed wavelength region selected according to a predetermined criterion among the light received by the receiving lens and to transmit light in a noise wavelength region other than the designed wavelength region
Implementation Method 2
a transmissive layer provided on the second surface so that the light in the noise wavelength region that has passed through the mirror body is transmitted
Data Source
AI summary
Disclosed are a light receiving module and a light detection and ranging (LIDAR) including the same. The light receiving module according to one embodiment of the present disclosure includes a receiving lens configured to receive external light, a reflective mirror configured to selectively reflect some of the light received by the receiving lens, and a detector configured to detect the light reflected by the reflective mirror, wherein the reflective mirror includes a mirror body having a first surface on a side on which the light received by the receiving lens is incident and a second surface on an opposite side of the first surface, a reflective layer provided on the first surface to reflect light in a designed wavelength region selected according to a predetermined criterion among the light received by the receiving lens, and to transmit light in a noise wavelength region other than the designed wavelength region, and a transmissive layer provided on the second surface so that the light in the noise wavelength region that has passed through the mirror body is transmitted.