Multi-Layer Hot Plate Coating for Metallic Black Reflectivity
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Solution Overview
Problem
Existing hot plates with metallic and dielectric coatings are limited in generating optical effects due to a restricted number of layers, which hampers their overall optical impression.
Innovation Solution
A hot plate with a coating comprising at least two metallic layers and two dielectric layers, specifically designed to achieve reflectivity below 15% in the 380 nm to 780 nm wavelength range, enabling a metallic black appearance through precise layer thicknesses and materials like SnOx and Stainless Steel, with a protective antioxidation layer, and optionally enhanced by imprinting or PVD techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of layers in the coating is increased from 2-4 to at least two metallic layers and at least two dielectric layers, then the optical effects and color representation are enhanced, but the manufacturing complexity increases
Solution Approach 1:
The coating is segmented into multiple distinct layers with specific functions: dielectric layers for optical interference effects, metallic layers for reflectivity control and black appearance, and a protective antioxidation layer for durability. Each layer is independently controlled during manufacturing, allowing precise optimization of optical properties while maintaining manufacturability through standardized deposition processes.
2Illumination intensity
If the reflectivity is reduced to below 15% in the 380 nm to 780 nm wavelength range, then a metallic black appearance is achieved, but the visibility and optical impression are reduced
Solution Approach 1:
The coating utilizes optical interference effects through precisely controlled layer thicknesses and material compositions to generate a metallic black appearance. By adjusting the thickness of dielectric and metallic layers, the coating reflects specific wavelengths minimally (below 15% in visible range) while maintaining visual presence through subtle optical variations and depth perception, achieving both aesthetic black appearance and adequate visibility.
3Manufacturing precision
If the layer thicknesses are precisely controlled to achieve specific optical effects, then the color design precision is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for layer thicknesses (e.g., dielectric layers at controlled thicknesses to achieve quarter-wave optical paths, metallic layers with specific thickness ranges for optimal reflectivity) and material compositions. These parameter specifications enable consistent reproduction of the metallic black effect and nuanced color variations while maintaining manufacturability through standard precision deposition techniques.
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 allows for a wide range of nuanced color designs and a uniform optical appearance, effectively creating a metallic black impression while ensuring the mechanical components remain hidden, enhancing the visual appeal and functionality of the hot plate.
Implementation Method 1
reflectivity of the hot plate is <15% in the wavelength range between 380 nm and 780 nm
Implementation Method 2
coating with at least two metallic layers and at least two dielectric layers... enable a highly individual and also nuanced color design
Implementation Method 3
The layers of the coating are preferably embodied by means of sputtering on the underside, in particular by means of magnetron sputtering
Data Source
AI summary
A hot plate includes a base plate having an underside. A coating has at least two metallic layers and at least two dielectric layers and is formed on the underside of the base plate in such a way that a reflectivity of the hot plate is lower than 15% in a wavelength range between 380 nm and 780 nm.