Oven Cavity Illumination Layout for Heat-Protected LED Lighting
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Solution Overview
Problem
In typical cooking ovens, the illumination within the cavity is insufficient for clear observation of foodstuff from outside, often causing shadows or glare, necessitating the oven door to be opened, and existing light sources are prone to destruction due to high temperatures.
Innovation Solution
The arrangement of light emitting elements, such as LEDs, within a heat sink of the oven casing, positioned away from the cavity, utilizing light guide elements and lenses for directed illumination, and potentially within an air exhaust duct, to maintain a cooler environment and prevent damage while providing optimal lighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source is arranged in the side wall or rear wall of the cavity, then the cavity is illuminated, but shadows or glare occur and the light source is exposed to high temperatures
Solution Approach 1:
The light source is extracted from the high-temperature cavity environment and relocated to the outer casing or air exhaust duct, which are cooler zones. This spatial separation allows the light source to operate in a thermally safe environment while still providing illumination to the cavity through optical guides or direct positioning near the opening.
Solution Approach 2:
An intermediary structure (such as the outer casing or air exhaust duct) is introduced between the light source and the cavity. This intermediary serves as a thermal barrier that protects the light source from direct heat exposure while allowing light transmission to the cavity through openings or transparent panels.
2Illumination intensity
If the light source is placed close to the cavity for optimal illumination, then the foodstuff is well-lit, but the light source is exposed to high temperatures and may be destroyed
Solution Approach 1:
The light source is extracted from the immediate vicinity of the cavity and positioned in the outer casing or exhaust duct, maintaining illumination effectiveness through optical design while ensuring thermal safety and operational reliability.
Solution Approach 2:
The illumination system transitions from a single-point source near the cavity to a distributed arrangement in the outer casing or exhaust duct, using multiple light emitting elements positioned at different locations to achieve optimal illumination while maintaining thermal safety.
3Illumination intensity
If the illumination is increased to improve observation, then the foodstuff is clearly visible, but the light source is exposed to higher temperatures
Solution Approach 1:
The light source is extracted from the high-temperature zone and positioned in the cooler outer casing or exhaust duct, enabling high illumination intensity to be achieved without exposing the light source to damaging temperatures.
Solution Approach 2:
The outer casing or air exhaust duct acts as an intermediary that allows high-intensity illumination to reach the cavity while maintaining a low-temperature environment for the light source, effectively decoupling illumination intensity from thermal exposure.
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 ensures sufficient and clear observation of foodstuff from outside the oven without glare, while protecting the light sources from heat damage, ensuring effective and safe illumination within the cooking cavity.
Implementation Method 1
The heat sink between the inner and outer walls prevents the destruction of the light emitting elements
Implementation Method 2
The light guide element allows a directed propagation of the light
Implementation Method 3
The glass panel, the lens or the lens system may be provided to disperse the light beam from the light guide element
Data Source
AI summary
The present invention relates to a cooking oven with at least one cavity (12) and an illumination-equipment for said cavity (12). The cooking oven comprises a number of outer walls (14, 16, 18, 44) forming a casing (10) of the cooking oven, a number of inner walls (20, 22, 24, 40) enclosing the cavity (12), and a plurality of light emitting elements (30) arranged between the outer wall (14, 16) and the adjoining plane-parallel inner wall (20, 22), wherein the light emitting elements (30) are arranged in a distance from the inner wall (20, 22). At least one of the light emitting elements (30) is thermally connected to the casing (10) of the cooking oven, so that the light emitting element (30) is arranged within a heat sink of the cooking oven. The invention relates further to a corresponding illumination-equipment.