UV LED Curing Light With NTC Thermistor Heat-Sink Cooling
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Solution Overview
Problem
Existing UV light-emitting devices used for curing substances are prone to overheating due to prolonged use, which can lead to damage and reduce their service life.
Innovation Solution
A UV light-emitting device with a compact design using a UV-A light-emitting diode on a printed circuit board, coupled with a thermistor and a copper heat sink, features a thermally conductive and electrically insulating connection, and a projection for efficient heat dissipation, ensuring stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If UV light-emitting diodes are operated for an extended period, then light emission continues, but the device overheats and may be damaged
Solution Approach 1:
A thermistor is introduced as an intermediary component between the lighting fixture and the control circuit. The thermistor detects temperature changes and provides feedback to regulate the current flow, preventing overheating while maintaining continuous operation. This mediator component enables the system to operate extended periods without damage.
Solution Approach 2:
The thermistor provides thermal feedback to the control circuit, which adjusts the current flow to the lighting fixture based on temperature conditions. This feedback mechanism ensures that the device operates within safe temperature limits while maintaining continuous light emission, thereby extending service life.
2Reliability
If a thermistor is added to detect temperature, then overheating is prevented, but device complexity increases
Solution Approach 1:
The thermistor serves multiple functions: it detects temperature, provides feedback for current regulation, and protects the lighting fixture from overheating. By making this single component multi-functional, the patent reduces the need for additional separate protection mechanisms, thereby limiting the increase in device complexity while improving reliability.
3Duration of action of moving object
If heat dissipation is improved, then service life is extended, but the lighting fixture size increases
Solution Approach 1:
The thermistor is integrated directly into the lighting fixture structure, merging the temperature sensing function with the existing fixture design. This integration avoids adding separate external components for heat dissipation, thereby extending service life through improved thermal management without significantly increasing the overall fixture size.
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 device effectively dissipates heat, preventing overheating and extending the service life of the UV light-emitting diode, allowing for efficient curing of larger surfaces with multiple units connected in series.
Implementation Method 1
a lighting fixture (1) with a thermal contact surface (11)... The lighting fixture comprises a light-emitting diode (13) designed to emit UV light
Implementation Method 2
the thermal energy generated during the light emission is dissipated from the lighting fixture (1) via the thermal contact surface (11)... a heat sink (3), which is thermally connected to the thermal contact surface (11)
Implementation Method 3
a thermistor (4), which is electrically connected to the electrical connections (12a, 12b) of the lighting fixture (1) and thermally connected to the heat sink (3)
Data Source
Figure 1~5
AI summary
The invention relates to a device (100) for emitting light, in particular for curing substances that cure when irradiated by light, in particular UV light, comprising – an electrical illumination body (1) having at least one thermal contact area (11) and at least two electrical connections (12a, 12b), – wherein thermal energy that arises in the context of the emission of light is able to be dissipated via the thermal contact area (11), – wherein the illumination body (1) is applied to a carrier element (2), – wherein the carrier element (2) has at least one cutout (21) in the region of the thermal contact area (11) of the illumination body (1), – a heat sink (3), which is thermally conductively connected to the thermal contact area (11) of the illumination body (1) in the region of the cutout (21) in the carrier element (2), and – an NTC thermistor (4), which is electrically conductively connected to the electrical connections (12a, 12b) of the illumination body (1), wherein the NTC thermistor (4) is thermally conductively connected to the heat sink (3) and at the same time electrically insulated from the heat sink (3).