LED Security Light Shadow Elimination via Detector Extraction
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Solution Overview
Problem
Existing LED security light designs are bulky, suffer from aesthetic issues due to dark shadows, and face heat management challenges with incandescent bulbs, limiting design flexibility and increasing complexity and costs.
Innovation Solution
An LED ceiling mount light with a compact, thin surrounding lamp shade made of optically transmissive material, featuring a doughnut-shaped LED illuminator and a detector assembly that can be moved out of the shade to eliminate shadows, using LEDs which generate less heat and require simpler heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a motion detector assembly with a lens is installed inside the lamp shade assembly with the lens protruding outwardly, then the detection capacity is improved, but a dark shadow is produced around the center of the lamp shade assembly which damages the aesthetic view
Solution Approach 1:
The detector assembly is extracted from the interior of the lamp shade assembly and repositioned on the rear surface of the lamp shade. This separation eliminates the shadow-casting problem while preserving the detection function, as the detector no longer blocks light paths from the light source.
2Reliability
If an incandescent light source is used to provide illumination, then the light source is reliable, but excessive heat is generated which causes instability or malfunction of the motion sensor and requires additional heat shielding and dissipating tasks
Solution Approach 1:
The light source type is changed from incandescent to LED technology. This parameter change fundamentally alters the thermal characteristics, reducing heat generation by approximately 90% while maintaining illumination reliability. The LED light source operates at much lower temperatures, eliminating the need for complex heat management systems.
3Volume of stationary object
If the detector assembly is installed inside the lamp shade assembly, then the structure is compact, but the installation of heat radiant incandescent bulb makes the structure more complicated to manage excessive temperature
Solution Approach 1:
The detector assembly is extracted from the enclosed lamp shade interior and relocated to the rear surface of the lamp shade. This spatial extraction simultaneously achieves two goals: maintaining structural compactness by keeping the overall footprint small, while eliminating heat management complexity by positioning the detector away from heat-generating components.
4Measurement precision
If the lens of the motion detector assembly is made larger to increase detection range, then the detection capacity is improved, but a larger area of black shadow is produced which proportionally damages the aesthetic view
Solution Approach 1:
By extracting the detector assembly from the light-blocking interior position and relocating it to the rear surface of the lamp shade, the system allows for larger lens dimensions to expand detection range without the penalty of increased shadow area. The detector no longer intercepts light paths, so lens size can be optimized for detection performance independently of aesthetic considerations.
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 provides a stylish, flexible design with reduced heat buildup, eliminating shadows and simplifying heat management, while maintaining 360-degree motion detection without compromising electronic performance.
Implementation Method 1
The LED illuminator includes a circuit board shaped which is doughnut-shaped or ring-shaped, and a plurality of light emitting diodes mounted on the circuit board
Implementation Method 2
The surrounding lamp shade is made of an optically transmissive material, and fixed on the base plate so as to define a housing space therebetween
Implementation Method 3
The motion detector assembly comprises a lens, a motion sensor and a light sensor. The motion detector assembly is installed inside the lamp shade assembly with the lens being disposed so as to protrude outwardly through the opening of the lamp shade assembly
Data Source
AI summary
An LED security light includes a base plate, a surrounding lamp shade, an LED illuminator, and a detector assembly. The surrounding lamp shade is fixed on the base plate. The LED illuminator includes a plurality of light emitting diodes, and is fully covered by the surrounding lamp shade. The detector assembly includes at least one lens and a detection circuit, disposed in the center of the base plate of the LED security light. The detector assembly is installed in an accommodating space formed between a cover plate and the base plate of the LED security light. The cover plate is recessed and mounted on an inner border of the surrounding lamp shade such that the cover plate can be illuminated by an edge light emitted from the LED illuminator. The lens is disposed to protrude outwardly through a circular opening of the cover plate.