Emergency Light Rotatable Optic for Asymmetric Beam Direction
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Solution Overview
Problem
Conventional emergency lighting fixtures with adjustable heads often emit symmetrical beams and lack additional adjustment mechanisms to refine the direction of asymmetrical beams, limiting their effectiveness in illuminating a path of egress during emergencies.
Innovation Solution
The emergency lighting fixture incorporates a rotatable optic that can be adjusted 360 degrees about a vertical axis, allowing for further refinement of the asymmetric beam pattern to better direct light along a path of egress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an adjustable lighting head with two adjustment axes is used, then the lighting direction can be aimed at the designated path of egress, but the beam pattern remains symmetrical and lacks refinement for asymmetric illumination needs
Solution Approach 1:
The patent applies asymmetry by introducing a rotatable optic that can be independently adjusted to create asymmetric beam patterns. This allows the lighting fixture to adapt to asymmetric egress paths and environmental conditions, resolving the contradiction between beam pattern adaptability and device complexity by adding only a single rotational degree of freedom rather than multiple adjustment axes
Solution Approach 2:
The rotatable optic provides dynamic adjustment capability, allowing the beam pattern to be reconfigured in response to changing egress requirements. This dynamic element enables the system to transition from fixed symmetric patterns to adjustable asymmetric patterns, improving adaptability without requiring a completely complex multi-axis adjustment mechanism
2Ease of operation
If a fixed optic is used in emergency lighting fixtures, then the device complexity is reduced, but the ability to adjust and refine light direction to illuminate egress paths is limited
Solution Approach 1:
The patent segments the lighting system into two independent adjustment components: the existing two-axis adjustable lighting head and the new rotatable optic. This segmentation allows each component to perform a specific function (positioning and beam shaping), improving ease of operation while keeping the overall device complexity manageable through modular design
Solution Approach 2:
The rotatable optic serves multiple functions: it refines the beam pattern, adjusts illumination direction, and adapts to different egress configurations. This multi-functionality improves the ease of operation by providing comprehensive control over light direction and pattern without requiring separate mechanisms for each function, thereby avoiding increased device complexity
Data Source
AI summary
A light fixture includes a housing and at least one adjustable light assembly coupled thereto. Each light assembly includes a light source and an optic lens that is disposed over at least a portion of the light source. At least a portion of the lens is positioned external to the housing. The lens is rotatably adjustable about an axis extending perpendicular from the lens and includes a portion of the light source. The lens emits an asymmetrical light output. A light source holder may be included as part of the light assembly and is used to couple the light assembly to the housing. The light source holder includes a first surface, a second surface opposite the first surface, and an aperture extending therethrough. The light source is positioned adjacent the first surface over the aperture while the lens is positioned adjacent the second surface over the aperture.