Broad Beam LED Lighting with Curved Focal Lens
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Solution Overview
Problem
Existing lighting devices using LED lamps and converging lenses often fail to achieve a broad vertical beam spread with uniform intensity, leading to inefficiencies and non-uniform light distribution, which can result in excessive power consumption and failure to meet specifications requiring peak intensity at the center or broad beam spread.
Innovation Solution
The use of a converging lens with a short focal length and ceramic LED lamps positioned closer to the lens than in prior designs, along with a peripheral mounting on the printed circuit board, to create a lighting device that produces a composite elongated light beam with a broad vertical beam spread and uniform intensity throughout an azimuth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If LED lamps are positioned at the focal point or just in front of the focal circle towards the lens, then the divergence of the composite light beam about the horizontal is minimized, but the vertical beam spread remains small and does not meet broad beam spread specifications
Solution Approach 1:
The patent changes the position parameter of LED lamps from the focal point to a location closer to the lens (within the hollow formed by the lens). This parameter change transforms the light concentration pattern from minimal divergence to broad vertical beam spread, enabling the system to meet different application specifications.
2Productivity
If LED lamps are positioned closer to the lens than prior art, then the vertical beam spread is broadened and efficiency is increased, but the central zone of the light beam has depressed intensity
Solution Approach 1:
The patent merges the light beams from multiple LED lamps positioned around the focal circle. The elongated light beams from adjacent LEDs overlap such that light from one beam extends into the central zone of adjacent beams, bolstering the intensity and creating a uniform composite beam pattern.
3Stability of the object's composition
If a large focal length is used, then the light beam has minimal divergence about the horizontal, but the vertical beam spread is limited and the device size increases
Solution Approach 1:
The patent transitions from a point focal configuration to a circular focal line configuration. By arranging LED lamps around a focal circle and using a lens with a curved focal line, the system achieves broad vertical beam spread while maintaining compact horizontal dimensions, effectively adding a dimensional aspect to the light distribution.
4Stability of the object's composition
If multiple LED lamps are added to increase azimuthal uniformity, then the power consumption increases to maintain uniform intensity throughout the azimuth
Solution Approach 1:
The patent applies local quality by positioning LED lamps at specific locations around the focal circle and using a lens with a curved focal line. This configuration naturally distributes light uniformly throughout the azimuth without requiring excessive power, as each LED contributes to specific angular zones where its light is most effective.
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 increases the efficiency and reduces the operating temperature of LED lamps, allowing for a higher percentage of light energy to be concentrated into a broad vertical beam spread, thereby improving the lighting device's performance and meeting specifications for broad beam spread applications.
Implementation Method 1
a converging lens for concentrating light into a composite elongated light beam
Data Source
AI summary
A high efficiency, broad beam lighting device 30 having a converging lens 1 having a curved focal line 26. A source of light comprising a plurality 9 of ceramic LED lamps disposed in an equiangular array having their apparent emission line between minimum divergence curved line 37 and interior surface 27 of converging lens 1 on broad beam curved line 39 such that each LED has its emitted light concentrated by lens 1 into an elongated light beam comprising a central zone substantially surrounded by a peripheral zone. Converging lens 1 further concentrates the light emitted by plurality 9 of LED lamps into a composite elongated light beam having a broad vertical beam spread and concurrently increasing the intensity at the location of the central zone of the elongated light beam of each LED by adding to that central zone location light from the elongated light beam of at least one adjacent LED.