Microwave Oven Bottom Reflective Portions for Uniform Heating
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Solution Overview
Problem
Microwave ovens often result in uneven heating of food due to uneven electromagnetic field distribution within the cooking chamber, leading to suboptimal cooking quality.
Innovation Solution
The microwave oven incorporates a patterned bottom surface with reflective portions that adjust in height and width to optimize microwave radiation distribution, ensuring even heating by controlling the distance and intensity of microwave transmission to the food.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat bottom surface is used in the cooking chamber, then the structure is simple, but the microwave radiation distribution is uneven leading to poor heating quality
Solution Approach 1:
The bottom surface is segmented into multiple reflective portions (first, second, and third reflective portions) with different heights and orientations. These segmented surfaces reflect microwave radiation from different directions onto the food, creating uniform heating across the entire food surface while maintaining a relatively simple overall structure.
Solution Approach 2:
Different regions of the bottom surface are given different local properties through the reflective portions with varying heights (h1, h2, h3) and orientations. Each local region reflects microwaves at specific angles tailored to its position, ensuring that all areas of the food receive appropriate radiation intensity for uniform heating.
2Productivity
If the tray is placed close to the bottom surface, then cooking time is reduced, but the distance control becomes critical for even heating
Solution Approach 1:
The reflective portions are designed with specific height variations (h1, h2, h3) that dynamically interact with the microwave radiation patterns. This dynamic geometric configuration ensures that regardless of the exact tray position within the optimal range, the reflected microwaves converge uniformly onto the food surface, maintaining heating quality while enabling faster cooking.
Solution Approach 2:
The bottom surface is pre-configured with reflective portions positioned and oriented to reflect microwaves onto the food before the cooking process begins. This preliminary arrangement of reflective surfaces ensures that as soon as microwaves are generated, they are immediately redirected to achieve uniform heating, reducing the time needed for even heat distribution.
3Manufacturing precision
If multiple reflective portions with different heights are added to the bottom surface, then heating uniformity is improved, but the device complexity increases
Solution Approach 1:
Multiple reflective portions with different heights and orientations are merged into a single integrated bottom surface structure. This unified design achieves complex microwave radiation control patterns while avoiding the need for separate adjustable components, thereby improving heating uniformity without proportionally increasing device complexity.
Solution Approach 2:
The reflective portions incorporate curved or angled surfaces that redirect microwave radiation in multiple directions. These curved geometries efficiently distribute reflected energy across the food surface, achieving uniform heating with simpler surface contours compared to multiple flat panels, thus balancing heating quality with structural simplicity.
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
This solution achieves more uniform heating of food, reducing cooking time and improving the quality of cooked food by ensuring consistent electromagnetic field distribution across the cooking chamber.
Implementation Method 1
Microwave ovens generate heat from the inside of food to heat the food through dielectric heating. When electromagnetic radiation having a high frequency penetrates into the food, it induces water polar molecules inside the food to rotate, and it produces thermal energy.
Implementation Method 2
at least one first reflective portion formed on the bottom surface of the cooking chamber... The at least one first reflective portion extends a given height (h) above a reference level (RL)
Data Source
AI summary
Disclosed herein is a microwave oven having an improved structure with which foods can be effectively heated. The microwave oven includes: a housing including a cooking chamber having a bottom surface; at least one first reflective portion formed on the bottom surface of the cooking chamber; a magnetron provided to generate microwave radiation; and a tray disposed apart from the bottom surface of the cooking chamber and supporting food to be heated. The at least one first reflective portion extends a given height (h) above a reference level (RL).