Arrow Fletching Light Distribution for Side Visibility
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Solution Overview
Problem
Existing lighted nocks on arrows are insufficiently visible from the side, especially when the arrow is buried in leaves or forest debris, as the light is primarily emitted rearward and not significantly from the side, making it difficult to retrieve the arrow.
Innovation Solution
The integration of translucent fletchings on the arrow shaft that receive light from the nock, with a parabolic interface between opaque and transparent portions to reflect light back along the arrow axis, ensuring visibility from all angles, including the sides, by using a LED and battery assembly positioned at the trailing edge of the arrow adjacent a clear polycarbonate nock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted primarily rearward from the nock, then the light source is effective for the hunter, but the arrow is not visible from the side when buried in leaves
Solution Approach 1:
The patent transitions from one-dimensional rearward light emission to three-dimensional light distribution by having light enter the fletching from the rear and exit through the sides, creating a glowing effect that increases visibility from all angles while maintaining rearward illumination
Solution Approach 2:
The fletching acts as an intermediary medium that receives light from the nock and redistributes it. The light enters the fletching through the rear surface and exits through the sides, making the fletching itself visible while also providing illumination toward the hunter
2Illumination intensity
If the fletching is made transparent to allow light transmission, then light can pass through to illuminate the target area, but the fletching itself becomes difficult to see
Solution Approach 1:
The fletching exhibits different optical properties in different locations: the rear surface is transparent to allow light entry from the nock, while the side surfaces have scattering properties that allow light to exit and make the fletching visible. This local variation in optical quality resolves the contradiction between light transmission and visibility
3Difficulty of detecting and measuring
If light is scattered to the sides to improve visibility, then the arrow becomes visible from all angles, but less light is available for rearward illumination
Solution Approach 1:
The fletching is functionally segmented into different light interaction zones: a rear surface that allows light entry and transmission, and side surfaces that scatter light for visibility. This segmentation allows the system to provide both side visibility and rearward illumination simultaneously by distributing light functions across different portions of the fletching
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 a significant amount of light to be transmitted back towards the hunter while also scattering light to the sides, making the fletchings glow and visible from all angles, thereby improving the visibility of the arrow's landing location.
Implementation Method 1
The translucent fletchings allow for light to be transmitted from the nock towards the front of the arrow
Implementation Method 2
with a parabolic interface between opaque and transparent portions to reflect light back along the arrow axis
Implementation Method 3
using a LED and battery assembly positioned at the trailing edge of the arrow
Implementation Method 4
a clear polycarbonate nock that transmits light to the fletchings
Data Source
AI summary
The visibility of an arrow after it has been fired is increased by illuminating arrow fletchings in which light injected into the nock is further injected into the fletchings.