Microwave Oven Door Shielding for Clear Cooking Visibility
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Solution Overview
Problem
The existing microwave oven doors have structural limitations in providing visibility into the cooking compartment, leading to inconvenience in checking the cooking state of food and potential heat leakage, which increases energy consumption and safety risks.
Innovation Solution
A door configuration using a multi-shielding layer on a transparent substrate, comprising a main shielding layer, insulating layer, base layer, buffer layer, and protective layer, coupled with a choke structure to prevent microwave leakage and enhance heat resistance, allowing for improved visibility and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a perforated metal plate is used for the door, then microwave shielding is achieved, but visibility into the cooking compartment is insufficient
Solution Approach 1:
The door employs a composite structure combining a transparent substrate (glass or plastic) with a transparent conductive oxide coating layer. This composite material provides both optical transparency for improved visibility and electrical conductivity for microwave shielding, resolving the contradiction between visibility and shielding effectiveness.
Solution Approach 2:
The patent changes the material parameters by transitioning from opaque metal to transparent conductive oxide coatings with specific optical and electrical properties. The coating's conductivity and transparency parameters are optimized to simultaneously achieve adequate microwave shielding and improved visual observation of the cooking compartment.
2Loss of information
If the door is opened to check food cooking state, then visibility is improved, but heat leakage occurs causing energy consumption and safety risks
Solution Approach 1:
The transparent door acts as an intermediary that allows visual information transfer from the cooking compartment to the exterior without requiring physical door opening. This mediator enables observation of cooking state while maintaining the thermal barrier, preventing heat leakage and associated energy loss and safety risks.
3Temperature
If a transparent substrate with multi-shielding layer is used, then visibility and heat resistance are improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses thin-film transparent conductive oxide coatings deposited on transparent substrates rather than thick metal structures. This thin-film approach provides adequate heat resistance and microwave shielding while maintaining manufacturing feasibility and avoiding excessive structural complexity.
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 enhances visibility into the cooking compartment without opening the door, improves heat resistance, reduces thermal leakage, and decreases manufacturing costs while maintaining effective microwave shielding.
Implementation Method 1
a shielding plate including a substrate and a shielding layer, with which the substrate is coated to prevent microwaves in the cooking compartment from leaking to an outside
Implementation Method 2
a door frame having an opening through which the cooking compartment is visible and a choke formed at an edge of the door frame to offset microwaves
Implementation Method 3
The multi-shielding layer may include an insulating layer stacked between the substrate and the main shielding layer
Data Source
Figure 1
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AI summary
Disclosed herein are a cooking apparatus including a main body including a cooking compartment configured to cook food using microwaves, and a door configured to open or close the cooking compartment, wherein the door includes a door frame in which an opening is formed so that the cooking compartment is visible therethrough, and a shielding plate including a substrate and a multi-shielding layer, with which the substrate is coated to prevent microwaves in the cooking compartment from leaking to an outside, and coupled at the opening. The door of the cooking apparatus allows an inside of the cooking compartment to be better seen from the outside.