Safety Vest Light Tubes for Low-Light Visibility
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Solution Overview
Problem
Safety vests, even with reflective materials, may not ensure visibility in low-light conditions and can be ineffective if dirty or not illuminated by an external light source, leading to potential collisions.
Innovation Solution
Integration of a light source with LED lights and translucent fabric tubes in the vest body, allowing light to shine through and providing a visible warning in dark settings, combined with a removable battery pack and recharging system for extended use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If reflective material is used in safety vests, then visibility is improved when illuminated by external light sources, but visibility deteriorates in low-light conditions or when not illuminated
Solution Approach 1:
The patent combines reflective material with active light-emitting elements (LEDs or other light sources) integrated into the vest structure. This merging allows the vest to both reflect external light and generate its own light, ensuring visibility across various lighting conditions including low-light environments where reflective material alone would fail.
Solution Approach 2:
The safety vest is designed to perform multiple functions: it reflects external light sources (traditional reflective function) and simultaneously generates its own light through integrated light-emitting elements. This multi-functionality ensures the vest remains effective across diverse conditions - daytime with sunlight, nighttime with vehicle headlights, and complete darkness with self-generated light.
2Illumination intensity
If LED buttons are added to safety vests, then active light emission is provided, but visibility and warning effectiveness remain insufficient compared to light tubes
Solution Approach 1:
The patent transitions from point-source LED buttons to extended light tubes that distribute light along their length. This local quality change transforms discrete light points into continuous light lines, significantly increasing the visible warning area and making the vest much more effective at alerting drivers and pedestrians from various distances and angles.
Solution Approach 2:
The invention moves from zero-dimensional LED buttons (point sources) to one-dimensional light tubes (line sources). This dimensional transformation expands the light-emitting surface area dramatically, creating a more prominent visual warning that can be seen from greater distances and multiple angles simultaneously.
3Illumination intensity
If reflective material is prominently placed on safety vests, then driver warning is provided when illuminated, but the vest becomes less visible as it gets dirty
Solution Approach 1:
The integrated light-emitting elements actively illuminate the reflective material and the vest itself, compensating for dirt accumulation. The self-generated light overcomes the reduced reflectivity caused by dirt, maintaining visibility and warning effectiveness even when the vest becomes dirty during use.
Data Source
AI summary
A safety vest includes a vest body including front, back and sides, a light source having a battery pack and at least one LED, the light source being removably mounted to the vest body, at least one light tube extending from one side of the light source, for receiving light projected from the LED and conveying the light along the length of the light tube, the light tube extending along the front, back or sides of the vest, and vest fabric mounted over the light tube to hold it in position against the vest body, the vest fabric being at least translucent and therefore permitting light from the light tube to shine therethrough.