Oven LED Light Conductor and Reflector for Heat-Shielded Illumination
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Solution Overview
Problem
Household appliance lights for cooking devices face challenges in maximizing usable light output while minimizing heat and shading issues, leading to reduced illumination quality and increased waste heat with powerful LEDs.
Innovation Solution
A compact household appliance light design using a light conductor made from a uniform material, such as glass, that bundles and directs LED light with minimal scatter losses, combined with a reflector that captures and redirects scatter light and thermal radiation, ensuring effective heat shielding and non-blinding illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If more powerful LED's are used to compensate for reduced light yield, then illumination intensity is improved, but operating temperature increases causing overheating problems
Solution Approach 1:
The LED is extracted from the cooking cavity environment and mounted on the rear wall of the light housing, physically separated from the heat source. This allows the LED to operate in a cooler environment while still providing illumination to the cooking cavity through the light conductor and reflector system
Solution Approach 2:
A light conductor (cylinder) acts as an intermediary between the LED and the cooking cavity. It transmits light from the LED mounted on the rear wall to the front, while the reflector mounted on the front wall reflects additional light into the cavity, achieving high illumination without placing the LED in the hot environment
2Temperature
If the LED is offset from the cooking cavity to minimize heat load, then temperature is improved, but light yield to the interior space is reduced
Solution Approach 1:
The lighting system uses a three-dimensional arrangement with a light conductor extending from the rear wall to the front wall of the housing. This spatial configuration allows the LED to be positioned away from the cooking cavity (reducing heat load) while the light conductor and reflector system direct light effectively into the cavity interior
Solution Approach 2:
The light conductor provides continuous light transmission from the LED location at the rear wall through the housing to the front, ensuring uninterrupted illumination of the cooking cavity despite the LED being offset from the heat zone
3Temperature
If heat barriers and offset measures are implemented, then temperature control is improved, but illumination quality is reduced
Solution Approach 1:
The light housing structure serves multiple functions: it provides mechanical support for the LED and optical components, acts as a thermal barrier to protect the LED from cooking heat, and incorporates the light conductor and reflector system to deliver high-quality illumination. This multi-functionality resolves the contradiction by integrating temperature control and illumination quality enhancement into a single unified design
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 maximizes light yield and reduces blinding effects by directing light efficiently into the cooking cavity while minimizing heat and shading, maintaining a compact design suitable for installation in cooking devices.
Implementation Method 1
A light conductor made from a uniform material, such as glass, that bundles and directs LED light with minimal scatter losses
Implementation Method 2
a reflector that captures and redirects scatter light and thermal radiation
Data Source
AI summary
A household appliance light, in particular a light for cooking devices like ovens, microwaves or steam cookers, the household appliance light including a LED configured as an illuminant; a light housing configured to be arranged at a wall of the household appliance; a light exit opening arranged in the light housing which is enclosed by a light permeable cover; a spacer element which is arranged between the LED and the light exit opening and which is arranged in front of a light outlet plane of the LED; and a reflection device which conducts light emitted by the LED to the cover, wherein the spacer element is a light conductor that is made from one uniform material, wherein the reflection device is a reflector which defines a reflector cavity, and wherein the light conductor is run into the reflector cavity.