Urethane Acrylate Camera Cover Coating for Scratch Resistance
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Solution Overview
Problem
Existing camera covers for surveillance cameras are prone to scratches and high costs due to long baking times required for hard coatings, which can lead to cracks and reduced image quality.
Innovation Solution
A camera cover with a dome-shaped substrate made of polycarbonate resin and a coating of urethane acrylate resin, which is photocurable, reducing manufacturing costs and providing a scratch-resistant and weather-resistant surface with controlled viscosity and thickness to maintain image resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard coating with silicone resin is applied to make the camera cover scratch-resistant, then scratch resistance is improved, but cracks may occur after film deposition and baking time is excessively long
Solution Approach 1:
The patent changes the chemical composition parameters of the coating material from silicone resin to a specific formulation containing polyurethane resin (30-70 wt%), acrylic resin (10-40 wt%), and inorganic filler (10-40 wt%). This parameter change in material composition provides both scratch resistance and crack resistance, eliminating the reliability issue while maintaining the strength improvement.
2Duration of action of stationary object
If a hard coating is applied to protect the camera cover, then durability is improved, but manufacturing cost increases due to long baking time
Solution Approach 1:
The patent replaces the thermal curing mechanism (baking) with a photocuring mechanism using UV light. The coating formulation includes photopolymerization initiators that enable curing upon UV exposure, substituting the time-consuming thermal process with a faster optical process, thereby reducing manufacturing time while maintaining coating durability.
3Strength
If a coating is applied to the camera cover, then scratch resistance is improved, but image resolution may be affected
Solution Approach 1:
The patent applies the coating with controlled local properties: the inorganic filler (such as silica or alumina particles with 0.1-10 μm diameter) is distributed to provide scratch resistance, while the resin matrix maintains optical clarity. The coating thickness and composition are optimized locally to ensure scratch protection without compromising the transparency and resolution required for surveillance imaging.
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 camera cover achieves a sufficient resolution and improved weather resistance with reduced mottling and scratches, maintaining image quality while being cost-effective and easy to manufacture.
Implementation Method 1
a coating of urethane acrylate resin, which is photocurable
Data Source
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AI summary
A camera cover (110) is provided. The camera cover (110) has a coating (1500) formed on a surface of the camera cover (110). The coating (1500) contains a urethane acrylate resin. The camera cover (110) has a dome shape and is designed to protect an image capturing unit (100). An arithmetic mean roughness Ra of a surface of the coating (1500) is no greater than 0.8 µm.