Dyed Glass-Ceramic Cooktop Composition for LED Display and IR Transmission
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Solution Overview
Problem
Existing glass-ceramic cooktops with high-quartz mixed crystals struggle to achieve optimal light transmission and infrared transmission while maintaining effective display capabilities for various colored LEDs, particularly red, blue, and green LEDs, and ensuring safety and aesthetic appearance.
Innovation Solution
A glass-ceramic cooktop with a composition that includes V2O5 as the primary color oxide, combined with specific redox adjustments and refining agents like SnO2 and CeO2, to achieve light transmission values of 0.8 to 2.5% in the visible range and 45-85% in the infrared range, while minimizing the use of arsenic and antimony oxides for environmental safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If V2O5 is used as the primary color oxide to achieve black aesthetic appearance and control visible light transmission, then the aesthetic appearance and visible light transmission are improved, but the infrared transmission and display capability for colored LEDs deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the concentration of V2O5 (0.01-0.06 wt%) and introducing Fe2O3 (0.05-0.2 wt%) to modify the optical transmission characteristics. By adjusting these chemical parameters and their ratios, the glass-ceramic achieves optimal balance between visible light absorption for aesthetic appearance and infrared transmission for cooking performance, while improving display capability for colored LEDs.
Solution Approach 2:
The patent uses composite materials by combining V2O5 with Fe2O3 and other metal oxides (TiO2, ZrO2, SnO2) in specific proportions. This composite approach creates a synergistic effect where V2O5 provides the primary black coloration and infrared transmission, while Fe2O3 enhances the display capability for colored LEDs and refines the overall optical properties, resolving the contradiction between aesthetic appearance and display versatility.
2Object-affected harmful factors
If SnO2 and CeO2 are used as refining agents to achieve good blister qualities and eliminate toxic compounds, then safety and environmental protection are improved, but the melting temperature and refining complexity increase
Solution Approach 1:
The patent uses CeO2 as an intermediary refining agent that facilitates the removal of toxic compounds (arsenic and antimony oxides) from the glass-ceramic melt. CeO2 acts as a mediator in the refining process, enabling effective blister quality improvement and toxic substance elimination while operating at controlled temperatures, thus resolving the contradiction between safety and processing temperature.
Solution Approach 2:
The patent replaces toxic refining agents (arsenic and antimony oxides) with safer alternatives (SnO2 and CeO2). This substitution strategy copies the refining function of the original toxic agents while eliminating their harmful effects, achieving the same blister quality improvement without the associated toxicity and environmental concerns.
3Adaptability or versatility
If light transmission is increased to enhance display capability for blue and green LEDs, then the display capability is improved, but the black aesthetic appearance and coverage of electronic components deteriorate
Solution Approach 1:
The patent applies local quality by creating wavelength-selective transmission characteristics. The glass-ceramic composition is designed to selectively transmit specific wavelengths (improving display capability for colored LEDs) while maintaining overall absorption in the visible range to preserve the black aesthetic appearance. This localized optimization of transmission properties at different wavelengths resolves the contradiction between display capability and aesthetic appearance.
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 improved visibility of radiant heating elements, enhanced display capabilities for different colored LEDs, and increased infrared transmission for faster cooking, while maintaining a black aesthetic appearance and ensuring safety by preventing UV light transmission, thus addressing the limitations of previous technologies.
Implementation Method 1
V2O5 is mostly used for the coloring as it has the special property of light absorbing within the visible range and allows a high transmission within the infrared radiation
Implementation Method 2
The crystallization is started by a glass consisting of a mixture of broken pieces of glass and a powdered mixture of raw materials which is usually melted at temperatures between 1500 and 1650° C. During the melting process usually arsenic and/or antimony oxide are used as refining agents
Implementation Method 3
allows a high transmission within the infrared radiation... transmission in the infrared at 1600 nm of 45-85%
Data Source
AI summary
Transparent, dyed cook top or hob with improved color display capability, consisting of a glass ceramic with high quartz mixed crystals as predominant crystal phase, whereby the glass-ceramic contains none of the chemical refining agents arsenic oxide and/or antimony, with transmission values of greater than 0.1% in the range of the visible light within the entire wavelength range greater than 450 nm, a light transmission in the visible of 0.8-2.5% and a transmission in the infrared at 1600 nm of 45-85%.