Alternating Parabolic Reflective Segments for Emergency Light Collimation
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Solution Overview
Problem
Existing emergency vehicle light fixtures do not effectively project directional light with a high degree of collimation and uniformity, limiting their visibility from various angles and intensity distribution.
Innovation Solution
An emergency vehicle light fixture with an elongated body featuring alternating linear and revolved parabolic segments, where LEDs are positioned at focal points, and revolved end reflector segments, directing light along a common axis with acute angles to enhance collimation and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single parabolic reflector is used, then light can be collimated along the optical axis, but the light distribution is not uniform across multiple viewing angles
Solution Approach 1:
The reflector is divided into multiple segments (first reflector segment, second reflector segment, third reflector segment) with different geometric configurations. Each segment handles a specific angular range, collectively providing uniform light distribution across all viewing angles while maintaining collimation performance.
Solution Approach 2:
Different segments of the reflector are designed with different local optical properties. The first segment (parabolic) provides collimation for on-axis viewing, while the second and third segments (with different curvatures) provide optimized light distribution for off-axis viewing angles, ensuring each region of the reflector is optimized for its specific function.
2Illumination intensity
If multiple reflector types are combined, then light distribution uniformity improves, but the device complexity increases
Solution Approach 1:
Multiple reflector segments with different geometric properties are merged into a single integrated reflector structure. The first, second, and third segments are positioned adjacent to each other and work together as one unified optical system, achieving uniform light distribution without requiring separate assemblies.
Solution Approach 2:
The reflector design transitions from a simple rotational symmetry around the optical axis to a more complex three-dimensional structure with segments having different curvature radii and angular positions. This dimensional complexity enables optimized light distribution across multiple viewing angles while maintaining a single integrated 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
The solution achieves a well-distributed and intense light pattern, visible from multiple angles with strong central intensity, improving the visibility and effectiveness of emergency vehicle lighting.
Implementation Method 1
a continuous reflective surface formed by a series of alternating linear and revolved parabolic segments
Implementation Method 2
revolved parabolic segments that are coextensive along the height of the reflective surface, each of which has a focal point that lies along a common axis
Data Source
AI summary
An emergency vehicle light fixture includes, among other things, an elongated body having a reflective surface formed by a series of alternating linear and revolved parabolic segments. The series of alternating linear and revolved parabolic segments are coextensive along the height of the reflective surface and have an optical axis. Each of the alternating linear and revolved parabolic segments has a focal point that lies along a common axis that is orthogonal to the optical axis.