Transparent Conductive Coatings for Microwave Oven Camera Shielding

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Solution Overview

Problem

Cameras in microwave ovens are exposed to heat and microwave radiation, which can impact their performance and durability, and existing camera shielding plate affects the image quality provided by the camera, and current camera mounting systems, limiting the view in microwave ovens, and existing shielding methods like perforated metal plates degrade image quality.

Innovation Solution

A transparent conductive metal coating is applied to a shield positioned between the camera and the food in the cooking chamber, reflecting microwave radiation and dissipating heat to protect the camera and light source.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a perforated metal shielding plate is used to shield the camera from microwave radiation and heat, then the camera is protected from heat and microwave radiation, but the image quality provided by the camera is degraded

Engineering Contradiction:

Improvecamera protectionVSAvoidimage quality

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent changes the material parameters of the shielding coating by using transparent conductive metal coatings with specific optical transparency and electrical conductivity properties. This allows the coating to reflect microwave radiation while maintaining visibility for the camera, resolving the contradiction between protection and image quality.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies a composite structure consisting of a transparent substrate (glass or plastic) coated with transparent conductive metal layers. This composite material combines the protective shielding function with optical transparency, eliminating the need for opaque perforated metal plates while maintaining camera protection and image quality.

Inventive Principle:

Principle #40Composite materials

2Measurement precision

If the camera is mounted inside the cooking chamber to improve viewing angles and real-time imaging, then the camera positioning and viewing angles are improved, but the camera is exposed to heat and microwave radiation which impacts camera performance and durability

Engineering Contradiction:

Improveviewing angle and image qualityVSAvoidcamera performance and durability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent introduces a transparent conductive metal coating as an intermediary barrier between the camera and the harsh cooking chamber environment. This coating acts as a mediator that allows optical signals to pass through while blocking harmful microwave radiation and heat, enabling the camera to be positioned inside the chamber without compromising its performance or durability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If a glass panel and metal shielding plate are used to shield the camera, then the camera is protected from food splatter and radiation, but the shielding plate limits the vision function and food recognition features

Engineering Contradiction:

Improvecamera protectionVSAvoidvision function and food recognition

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the optical parameters of the shielding material by using transparent conductive metal coatings that maintain high optical transparency. This allows the camera to capture clear images for food recognition and monitoring functions while still providing protection from radiation and food splatter, resolving the contradiction between protection and vision function.

Inventive Principle:

Principle #35Parameter changes

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 maintains image quality and protects the camera and light source from heat and microwave radiation, allowing for effective monitoring and illumination within the cooking chamber.

Implementation Method 1

The shield includes a first transparent conductive metal coating on one or both of the first surface and the second surface, such that the shield dissipates heat and reflects microwave radiation to protect the camera

Methodology Applied

Scientific EffectMicrowave radiation reflection: Reflection

Implementation Method 2

Methodology Applied

Scientific EffectHeat dissipation: Conduction (thermal)

Data Source

PatentUS12426135B2Transparent metal coatings for camera pane in microwave oven

Publication Date: 2025.09.23 WHIRLPOOL CORP

AI summary

A heating appliance, such as a microwave oven, includes a housing having interior walls with interior surfaces defining a cooking chamber for heating food. The heating appliance also includes a camera positioned within the housing to capture images of food in the chamber, and a shield positioned between the camera and the food. The shield has a body with a first surface facing an area for receiving food within the chamber and a second opposite surface facing the camera. The shield includes a first transparent conductive metal coating on one or both of the first surface and the second surface, such that the shield dissipates heat and reflects microwave radiation to protect the camera.