Oven LED Lamp Light Guide and Reflector for Heat-Shielded Illumination
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Solution Overview
Problem
Household appliance lights for cooking appliances face challenges in maximizing light output while minimizing heat and glare, with existing solutions often resulting in light losses and reduced illumination quality due to shading and heat barriers.
Innovation Solution
A compact household appliance light using a light guide made of the same material as the LED, with a uniformly inclined light exit surface and a reflector with asymmetrical reflection surfaces, directs scattered radiation towards the interior while spacing the LED from the cooking chamber to reduce heat and glare, and a reflector captures thermal radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the LED is spaced far from the cooking chamber to minimize heat load, then the temperature stress on the LED is reduced, but the light yield and illumination quality are reduced
Solution Approach 1:
A light guide is introduced as an intermediary component between the LED and the cooking chamber. The light guide transports light from the LED (spaced away from the heat source) to the illumination area, while a reflector captures and redirects scattered light. This mediator system enables both heat isolation and effective light delivery without requiring the LED to be close to the cooking chamber.
Solution Approach 2:
The lighting system is segmented into distinct functional components: the LED light source, the light guide for light transport, and the reflector for light redirection. This segmentation allows the LED to be positioned away from the heat source while still achieving effective illumination through the coordinated action of separate light-guiding and light-redirecting elements.
2Temperature
If heat barriers and shielding measures are implemented to protect the LED, then the temperature stress is minimized, but light losses occur and illumination quality deteriorates
Solution Approach 1:
The light guide serves as a mediator that transmits light through the heat barrier region without requiring the light to pass through heat-blocking materials. The reflector acts as another mediator that recovers scattered light that would otherwise be lost, redirecting it toward the cooking chamber to compensate for any light losses.
Solution Approach 2:
The reflector converts harmful scattered radiation and thermal radiation into beneficial directed light toward the cooking chamber. By capturing light that would otherwise be wasted and redirecting it usefully, the system turns potential losses into additional illumination benefit.
3Illumination intensity
If more powerful LEDs are used to compensate for reduced light output, then the illumination quality is improved, but the operating temperature increases and heat management becomes more difficult
Solution Approach 1:
The light guide and reflector system acts as an optical amplifier that enhances the effectiveness of the LED output without requiring increased LED power. The reflector redirects scattered light to increase overall illumination efficiency, allowing standard-power LEDs to achieve the lighting效果 of more powerful LEDs would otherwise require.
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 enhances light yield and illumination quality by effectively directing light into the cooking chamber, reducing glare, and maintaining a compact design suitable for installation in cooking appliances, while also serving as a heat shield to manage thermal radiation.
Implementation Method 1
a light guide (15) made of the same material as the LED (13), which absorbs and bundles the light
Implementation Method 2
the light guide (15) made of the same material as the LED (13), which absorbs and bundles the light
Implementation Method 3
a reflector (20), which essentially directs the scattered radiation emerging from the light guide (15) in the direction of the cover element (21)
Implementation Method 4
the reflector (20), which essentially directs the scattered radiation emerging from the light guide (15) in the direction of the cover element (21); serving as a heat shield to manage thermal radiation
Data Source
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AI summary
Shown and described is a household appliance lamp, in particular a lamp for cooking appliances such as ovens, microwave ovens or steam cookers, with an LED as the light source, with a lamp housing intended for arrangement on the wall of the appliance, with a light exit opening in the lamp housing which is closed by a translucent cover, with a Spacer element, which is arranged between the LED and the light exit opening and sits in front of the light exit plane of the LED, with a reflection means, which directs the light emitted by the LED to the cover, the spacer element being a light guide of the same material, the reflection means being a reflector, which has a Spans reflector space, which is ushered the light guide in the reflector space.