Microwave Door Shielding Structure for Clear Cooking Visibility
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Solution Overview
Problem
Conventional microwave cooking appliances lack visibility into the cooking room during operation, requiring users to open the door to monitor the cooking process, and existing shielding solutions compromise this visibility by allowing electromagnetic waves to leak.
Innovation Solution
A cooking appliance with a door structure featuring a conductive shielding member and fixing member that blocks electromagnetic waves while allowing transparent visibility, using a conductive blocking layer on a transparent plastic or glass film, and a fixing member that secures the shielding member to the door frame, ensuring electrical connection and maintaining the shielding function without compromising visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent window is added to the door to improve visibility, then visibility into the cooking room is improved, but electromagnetic waves may leak through the transparent material
Solution Approach 1:
The patent applies a composite structure consisting of a transparent base material (plastic or glass film/panel) combined with a conductive blocking layer. This composite material allows light transmission for visibility while the conductive layer blocks electromagnetic waves, resolving the contradiction between transparency and electromagnetic shielding.
Solution Approach 2:
The conductive blocking layer is applied selectively on the transparent material surface rather than making the entire door opaque. This localized application maintains transparency where needed while providing electromagnetic wave blocking capability, achieving both visibility and shielding requirements.
2Object-affected harmful factors
If a shielding member is placed over the opening to block electromagnetic waves, then electromagnetic wave blocking is improved, but visibility through the opening is reduced
Solution Approach 1:
The shielding member is constructed as a composite material that combines transparent plastic or glass with a conductive blocking layer. This allows the shielding member to block electromagnetic waves while remaining transparent to visible light, thus maintaining visibility.
Solution Approach 2:
The patent changes the optical and electromagnetic parameters of the shielding material by applying a conductive layer with specific conductivity properties to the transparent substrate. This parameter modification enables the material to simultaneously transmit light and block electromagnetic waves.
3Ease of manufacture
If the shielding member is fixed directly to the door frame without proper electrical connection, then installation is simplified, but electromagnetic wave blocking effectiveness is compromised
Solution Approach 1:
The fixing member is designed to combine both mechanical fixation and electrical connection functions in a single component. The fixing member simultaneously secures the shielding member to the door frame and establishes electrical connection between the conductive blocking layer and the conductive border portion, ensuring both structural integrity and electromagnetic shielding effectiveness.
Solution Approach 2:
The fixing member serves multiple functions: it acts as a mechanical fastener to hold the shielding member in place, provides electrical connection between the conductive layers, and ensures proper positioning for optimal shielding performance. This multi-functionality simplifies the overall assembly process while maintaining effectiveness.
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
Enables clear visibility into the cooking room without opening the door while effectively blocking electromagnetic waves, ensuring the shielding member remains functional and undamaged over long-term use, meeting international electromagnetic shielding standards.
Implementation Method 1
a shielding member arranged to cover the opening and having a conductive blocking layer configured to block electromagnetic waves
Implementation Method 2
The microwave heats food by producing heat from inside the food according to a dielectric heating method
Data Source
AI summary
A cooking appliance with an improved structure to increase visibility to get a better look at the inside of a cooking room during cooking while blocking electromagnetic waves generated in the cooking room from leaking out. The cooking appliance includes a main body configured to have having a cooking room and a door arranged on the front of the main body to open or and close the cooking room. The door includes a door frame configured to have an opening formed to see into the cooking room and a conductive border portion around the opening; a shielding member arranged to cover the opening and having a conductive blocking layer configured to block electromagnetic waves; and a fixing member arranged to combine the door frame and the shielding member.