Induction Cooktop Glass Plate Colorant Composition
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Solution Overview
Problem
Induction cooking appliances face challenges in hiding internal elements while maintaining accurate color rendering of displays, especially with low light transmission glass-ceramic plates, which are not effectively addressed by existing technologies.
Innovation Solution
Strengthened glass plates with specific chemical compositions, including Fe2O3, CoO, Se, and Cr2O3 colorants, are used to match the appearance of dark glass-ceramics, ensuring internal elements are hidden and displays, such as white LEDs, are rendered correctly without distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If optical coatings or coloring agents are introduced to decrease light transmission and hide internal elements, then the hiding effect is improved, but color rendering of displays becomes distorted
Solution Approach 1:
The patent applies parameter changes by precisely controlling the concentrations of multiple coloring agents (Fe2O3: 0.8-1.8%, CoO: 0.02-0.06%, Se: 0-0.005%, Cr2O3: 0-0.1%) to achieve a specific optical property profile. This combination and concentration control creates a dark appearance (hiding internal elements) while maintaining accurate color rendering of LED displays, resolving the contradiction between hiding effect and color accuracy.
2Object-affected harmful factors
If vanadium is added to create dark glass-ceramic plates, then the hiding effect is improved, but the color rendering of modern LED displays is distorted
Solution Approach 1:
The patent applies color changes by replacing vanadium-based dark coloring with a specific combination of Fe2O3, CoO, Se, and Cr2O3. This new colorant system produces a dark appearance similar to vanadium glass-ceramics but with superior color rendering properties that accurately display LED colors, thus resolving the contradiction between hiding effect and color rendering.
3Object-affected harmful factors
If glass plates with low light transmission are used to hide internal elements, then the hiding effect is improved, but the brightness and visibility of displays are reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the concentrations of coloring agents to achieve a balance between light transmission and color accuracy. The specific formulation (Fe2O3: 0.8-1.8%, CoO: 0.02-0.06%, Se: 0-0.005%, Cr2O3: 0-0.1%) creates sufficient darkness to hide internal elements while maintaining adequate brightness and color accuracy for LED displays.
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 provides glass plates that appear similar to existing dark glass-ceramic plates, effectively hiding internal components and ensuring accurate color rendering of displays, including blue, green, red, and white, while maintaining optimal thermomechanical strength and resistance to thermal shocks.
Implementation Method 1
the electric current induced therein by the magnetic field generated by the inductors
Implementation Method 2
items of cookware (saucepans, skillets, etc.) which are heated by virtue of the electric current induced therein
Implementation Method 3
heating the glass above its glass transition temperature, then rapidly cooling it, generally by means of nozzles that blow air onto the surface of the glass
Implementation Method 4
As the surface cools more rapidly than the bulk of the glass, compressive stresses form at the surface of the glass plate
Implementation Method 5
The substitution of a surface ion of the glass plate (generally an alkali-metal ion such as a sodium or lithium ion) with an ion of larger ionic radius (generally an alkali-metal ion, such as a potassium or sodium ion)
Implementation Method 6
Fe2O3 (total iron) 0.8 to 1.8%, CoO 0.02 to 0.06%, Se 0 to 0.005%, Cr2O3 0 to 0.1%
Data Source
AI summary
The subject matter of the invention is a reinforced glass plate for an induction cooking device, the chemical composition of which comprises the following colorants, in a content which varies within the weight limits defined hereinafter: Fe2O3 (total iron): 0.8% to 1.8%, CoO: 0.02% to 0.06%, Se: 0 to 0.005%, Cr2O3: 0 to 0.1%. The invention is also directed towards an induction cooking device comprising at least one inductor placed under such a glass plate.