Anti-Reflective Black Paint Composition for LiDAR IR Reflection
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Solution Overview
Problem
Existing anti-reflective paints do not adequately address reflectance in the infrared wavelength range used by LiDAR devices and fail to ensure sufficient adhesion to aluminum substrates, leading to optical noise and reduced precision.
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, 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 paints are used, then visible light reflectance is reduced, but infrared wavelength reflectance remains high causing optical noise in LiDAR devices
Solution Approach 1:
The patent changes the optical parameters of the paint by incorporating silica filler with specific refractive index and controlled pore structure, transforming the paint's reflectance characteristics across different wavelengths. The pore size (0.01-10 μm) and silica content (1-50 wt%) are specifically tuned to achieve infrared reflectance reduction while maintaining visible light absorption.
Solution Approach 2:
The patent creates a composite paint formulation combining epoxy resin, black pigment, and silica filler with specific properties. This composite structure leverages the light-absorbing properties of carbon black in visible range and the refractive index mismatch of silica in infrared range, achieving broad-spectrum anti-reflective performance.
2Object-affected harmful factors
If the paint formulation is optimized for infrared reflectance reduction, then adhesion to aluminum substrate may deteriorate
Solution Approach 1:
The patent applies different functional components at different concentrations to achieve localized effects: epoxy resin (5-30 wt%) provides adhesion to the aluminum substrate, while silica filler (1-50 wt%) and black pigment (10-40 wt%) are concentrated in the coating layer to provide anti-reflective properties. This spatial differentiation of material functions resolves the contradiction between adhesion and reflectance reduction.
Solution Approach 2:
The silica filler with controlled pore structure (0.01-10 μm pore size) serves dual functions: it creates refractive index variations for infrared reflectance reduction while the porous structure increases surface area for better mechanical interlocking with the substrate, thereby maintaining adhesion strength.
3Object-affected harmful factors
If silica filler with air layers is added to reduce infrared reflectance, then paint composition complexity increases
Solution Approach 1:
The silica filler serves multiple functions simultaneously: it acts as a refractive index modifier for infrared reflectance reduction, a structural filler for coating integrity, and a surface texture creator for enhanced adhesion. This multi-functionality reduces the need for additional specialized additives, simplifying the overall formulation despite the sophisticated performance requirements.
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 effectively suppresses surface reflection and optical noise in LiDAR devices, particularly in the infrared region, while maintaining strong adhesion to aluminum components.
Implementation Method 1
the silica filler includes an air layer therein
Implementation Method 2
the silica filler includes an air layer therein
Implementation Method 3
an epoxy resin, a cationic thermal reaction initiator
Data Source
Figure 1~2
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°.