Anti-Reflective Black Coating for LiDAR IR Noise and Aluminum Adhesion
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Solution Overview
Problem
Existing anti-reflective paints do not adequately address reflectance in the infrared wavelength range for LiDAR devices and do not ensure sufficient adhesion to aluminum substrates, failing to meet the need for further reduced reflectance while maintaining bond strength.
Innovation Solution
An anti-reflective black paint composition comprising a solvent, epoxy resin, cationic thermal reaction initiator, black pigment, and silica filler with internal air layers is formulated, achieving a reflectance of 2.5% or less at 1,500 nm and excellent adhesion to aluminum surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional anti-reflective paint is used, then visible light reflectance is reduced, but infrared reflectance remains high causing optical noise in LiDAR devices
Solution Approach 1:
The patent modifies the optical parameters of the paint by incorporating silica filler with specific refractive index and controlled porosity (5-50 μm pore size), transforming the paint's interaction with infrared wavelengths to achieve reflectance of 2.5% or less at 1,500 nm while maintaining adhesion to aluminum substrates
Solution Approach 2:
The patent creates a composite paint formulation combining epoxy resin, black pigment, and specialized silica filler containing air layers, where the multi-phase composite structure (resin matrix + pigment particles + air-filled pores) synergistically reduces infrared reflectance through multiple scattering and absorption mechanisms
2Object-affected harmful factors
If reflectance is reduced to suppress optical noise, then adhesion to aluminum substrate may deteriorate
Solution Approach 1:
The patent applies different functional properties to different components: the epoxy resin provides adhesion to the aluminum substrate, the black pigment absorbs visible light, and the silica filler with air layers reduces infrared reflectance, allowing each component to optimize its local function without compromising overall performance
Solution Approach 2:
The silica filler acts as an intermediary component that bridges the adhesion function (provided by epoxy resin) and the anti-reflective function (provided by black pigment), with its air layers and specific surface properties enabling both good substrate bonding and superior infrared reflectance reduction
3Object-affected harmful factors
If porous structure is introduced to reduce reflectance, then coating density and adhesion may decrease
Solution Approach 1:
The patent intentionally incorporates porous silica filler with controlled pore sizes (5-50 μm) containing air layers, where the porous structure reduces infrared reflectance through multiple internal reflections and scattering, while the pore walls provide increased surface area for chemical bonding to the aluminum substrate
Solution Approach 2:
The silica filler particles are designed with spherical morphology and smooth curved surfaces, which reduce stress concentration points compared to angular particles, maintaining coating integrity and adhesion while the spherical air-filled pores effectively scatter and absorb infrared radiation
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 composition provides superior anti-reflective properties in the infrared region, particularly for LiDAR devices, with reduced specular and diffuse reflectance and enhanced adhesion to aluminum housings, effectively suppressing optical noise.
Implementation Method 1
the silica filler includes an air layer therein
Implementation Method 2
the reflectance for light having a wavelength of 1,500 nm is 2.5% or less
Implementation Method 3
has excellent adhesion to a housing of the above-mentioned devices mainly composed of aluminum
Data Source
AI summary
The present invention provides an anti-reflective black paint composition having a favorable anti-reflective property, particularly in the infrared region used in LiDAR devices and the like, and having excellent adhesion to a housing of the above-mentioned devices mainly composed of aluminum. Provided is an anti-reflective black paint composition containing: a solvent; an epoxy resin; a cationic thermal reaction initiator; a black pigment; and a silica filler, wherein the silica filler includes an air layer therein, and when made into a cured dry paint coat, a reflectance for light having a wavelength of 1,500 nm is 2.5% or less in total light reflectance measurement at an angle of incidence of 8°.