RF Antenna Placement in Lighting Device Reflector
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Solution Overview
Problem
RF signals used for remote control of lighting devices are often shielded by metal heat sinks, reducing reception efficiency and requiring non-metallic components in the base or frame, which complicates manufacturing and thermal performance.
Innovation Solution
An RF antenna is positioned within a reflector, spatially separated from the heat sink and driving electronics, allowing improved RF reception without affecting light distribution, and enabling a metal base and frame for enhanced thermal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the RF antenna is placed in the metal heat sink, then the heat sink can be large enough to ensure efficient cooling, but the metal heat sink shields the RF antenna and greatly reduces RF reception
Solution Approach 1:
The patent divides the lighting device into separate functional zones: the heat sink base for thermal management and the reflector structure for RF antenna placement. This spatial segmentation allows the metal heat sink to maintain its cooling function while the RF antenna operates in a separate zone with reduced electromagnetic interference.
Solution Approach 2:
The RF antenna is moved from the two-dimensional plane of the heat sink base to the three-dimensional space within the reflector cavity. This dimensional transition places the antenna in a location that is spatially separated from the metal heat sink, thereby reducing shielding effects while maintaining efficient cooling at the base.
2Reliability
If the RF antenna is placed away from the heat sink to improve RF reception, then RF reception is improved, but the base and frame cannot be made entirely of metal
Solution Approach 1:
The reflector structure serves multiple functions simultaneously: it acts as a support for the RF antenna, provides the necessary spatial separation from the heat sink for improved RF reception, and maintains the structural integrity of the device. This multi-functionality allows the base and frame to be made entirely of metal without compromising RF performance.
3Device complexity
If the RF antenna is arranged on the heat sink, then the structure is simplified, but the RF communication angle is limited and reception is reduced
Solution Approach 1:
The reflector structure acts as an intermediary element that supports the RF antenna and positions it optimally within the device. This intermediary structure enables the antenna to achieve a wider communication angle and better reception without significantly increasing overall device complexity, as the reflector is a necessary component for light distribution anyway.
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 configuration enhances RF communication capability, reduces power requirements, and maintains uniform light distribution, while allowing the same heat sink design for both RF and non-RF products, lowering manufacturing costs and improving thermal performance.
Implementation Method 1
a reflector arranged to reflect light from the light source laterally and backwardly
Implementation Method 2
an LED based lighting device generally comprises a metal heat sink for cooling the LEDs and the driving electronics
Implementation Method 3
an RF antenna configured to receive signals for controlling the lighting device
Data Source
Figure 1
Figure 2
AI summary
The present invention relates to a lighting device (1). The lighting device comprises a light source(7) arranged at a base (2) of the lighting device, the light source having a main forward emission direction (12). The lighting device further comprises a radio frequency, RF, antenna (10) configured to receive signals for controlling the lighting device and a reflector (9) arranged to reflect light from the light source laterally and backwardly. The RF antenna is arranged at the reflector. The present invention is advantageous in that the RF reception of the lighting device is improved.