LED Spotlight Radial Emission Parabolic Reflector Design
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Solution Overview
Problem
Existing LED-based spotlights struggle to achieve uniform illuminance across a narrow emission angle, particularly in compact form factors, as they often concentrate light on the axis, making it difficult to develop effective optical arrangements for spotlights with emission angles of 20° or less.
Innovation Solution
The design incorporates a dish-shaped reflector with LEDs configured to emit light radially at angles between 40° to 140° relative to the spotlight's emission axis, utilizing a thermally conductive substrate and parabolic reflective surfaces to achieve a compact form factor and narrow emission angle, typically less than 20°, while ensuring efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If LEDs are configured to emit light radially at angles between 40° to 140° relative to the emission axis, then a compact form factor and narrow emission angle (≤20°) are achieved, but uniform illuminance distribution across the emission angle becomes difficult to achieve
Solution Approach 1:
The reflector is divided into multiple parabolic reflective surface portions, with each portion associated with a specific LED. This segmentation allows each LED's light to be independently controlled and reflected, enabling precise adjustment of the emission angle and illuminance distribution while maintaining a compact form factor.
Solution Approach 2:
Each parabolic reflective surface portion is specifically designed to correspond to a particular LED's emission characteristics. By localizing the reflective properties to match each LED's radial emission pattern, the system achieves uniform illuminance distribution across the narrow emission angle while preserving the compact geometry.
2Shape
If a dish-shaped reflector with parabolic surfaces is used to control emission angle, then narrow beam spread (≤20°) is achieved, but heat dissipation efficiency deteriorates
Solution Approach 1:
The reflector is designed with parabolic surfaces that extend in multiple dimensions, creating a three-dimensional light distribution pattern. This dimensional approach allows the reflector to control the emission angle effectively while providing sufficient surface area for heat dissipation through the parabolic geometry's extended structure.
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 allows for the creation of energy-efficient LED spotlights with a compact form factor and uniform light distribution, capable of replacing traditional halogen lamps with improved illuminance and a narrow beam spread, such as the MR16 halogen lamp, while maintaining a standard form factor for easy retrofitting into existing fixtures.
Implementation Method 1
a dish-shaped reflector and a plurality of LEDs, wherein the LEDs are configured such that in operation each emits light in a generally radial direction to the emission axis of the spotlight
Implementation Method 2
The LEDs can be configured such that their emission axis is at an acute angle to the emission axis of the spotlight at an angle in a range 40° to 85°
Data Source
AI summary
An LED spotlight that is operable to emit light with a selected emission angle measured relative to an emission axis of the spotlight comprises: a dish shaped (parabolic) reflector and a plurality of LEDs, wherein the LEDs are configured such that in operation each emits light in a generally radial direction to the emission axis of the spotlight and wherein the light emission axis of the LEDs is configured at an angle to the emission axis of the spotlight of at least 40°. In preferred embodiments the LEDs are configured such that their emission axis is substantially orthogonal to the emission axis of the spotlight and the reflector comprises a respective parabolic light reflective surface portion associated with a respective one of the LEDs.