LED Lighting Device with Reflective Top Plate for Eye Safety
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Solution Overview
Problem
Conventional LED lighting devices do not effectively mitigate direct eye exposure to intense light sources, which can cause discomfort and vision obstruction, especially in indirect lighting setups.
Innovation Solution
A lighting device design featuring a heat sink with a reflective top plate and inclined bottom plate, along with an optical body and cover, that redirects and diffuses light from multiple LED source units, ensuring light is emitted in a controlled direction and reducing direct visibility of the LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct lighting is used to maximize luminous efficiency, then light output is improved, but direct eye exposure to intense light causes discomfort and vision obstruction
Solution Approach 1:
A reflective top plate with a conical reflective surface is introduced as an intermediary between the LED light source and the external environment. This reflective surface redirects light that would otherwise travel directly toward the observer, converting direct light paths into reflected paths that achieve indirect lighting效果, thereby protecting eyes from direct exposure while maintaining luminous efficiency
Solution Approach 2:
Instead of allowing light to travel directly from the source to the target (direct lighting), the design inverts the light path by using a reflective surface to bounce light indirectly toward the target area. This inversion transforms the direct lighting approach into an indirect lighting solution that eliminates harmful direct eye exposure while preserving lighting effectiveness
2Object-affected harmful factors
If indirect lighting is used to protect eyes from direct light exposure, then eye safety is improved, but light intensity and luminous efficiency are reduced
Solution Approach 1:
The reflective top plate serves as an intermediary that captures and redirects light rather than allowing it to be lost. By positioning the reflective surface at a 45-degree angle, the system efficiently redirects light that would otherwise be wasted or cause direct exposure, thereby maintaining high luminous efficiency while achieving eye protection
Solution Approach 2:
The design changes the directional parameters of light propagation by using a conical reflective surface with specific angular geometry. This parameter change redirects light at controlled angles, ensuring that light reaches the intended target area with high efficiency while preventing direct line-of-sight exposure to the light source
3Illumination intensity
If multiple light source units are provided to increase illumination, then lighting coverage is improved, but direct visibility of multiple LED sources increases eye discomfort
Solution Approach 1:
The lighting system is segmented into multiple independent light source units, each equipped with its own reflective top plate. This segmentation allows each LED source to be individually managed and redirected, ensuring comprehensive lighting coverage while preventing any single direct LED exposure point from causing eye discomfort
Solution Approach 2:
Each light source unit is paired with a reflective top plate that acts as an intermediary, redirecting light from multiple sources simultaneously. This systematic application of the intermediary principle across multiple sources ensures that increased illumination coverage does not come at the cost of increased direct eye 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
The solution effectively protects users' eyes from direct LED light exposure by redirecting light through a conical reflective surface and inclined surfaces, enhancing luminous efficiency and user safety.
Implementation Method 1
a top plate being disposed on the opening of the heat sink and including a reflective surface which reflects light from the light source unit in a particular direction
Implementation Method 2
a heat sink including an inner surface on which the substrate of the light source unit is disposed
Implementation Method 3
a plurality of heat radiating fins are disposed on the outer surface of the heat sink
Implementation Method 4
an optical body which is disposed between the heat sink and the reflective surface of the top plate and excites, diffuses or collects light from the light source unit
Implementation Method 5
The lens excites, diffuses or collects the light from the reflective surface of the top plate
Data Source
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AI summary
A lighting device may be provided that includes a lighting device including: a light source unit including a substrate and a light emitting device disposed on the substrate; a heat sink including an inner surface on which the light source unit is disposed and at least one opening; and a top plate being disposed on the heat sink and including a reflective surface which reflects light from the light source unit in a particular direction.