Periscopic Bow Sight Extended Accuracy
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Solution Overview
Problem
Existing archery bow sights require multiple aiming points for different target distances, necessitating accurate distance estimation and adjustments, which is challenging and error-prone, especially over extended ranges due to the curved trajectory of projectiles under gravity.
Innovation Solution
A periscopic bow sight with a fixed pair of mirrors creates a line of sight that closely matches the arrow's flight path, allowing a single aiming point to be used over an extended range by calibrating the sight for a specific target distance, eliminating the need for multiple adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional single aiming point sight is used, then the device complexity is low, but the accuracy range is limited to only a few yards in front and behind the target
Solution Approach 1:
The patent introduces a periscope-like structure with mirrors that creates a virtual elevated aiming point. This dimensional change in the sight line geometry allows the arrow's curved trajectory to intersect the sight axis at multiple points along the flight path, extending the accuracy range from a few yards to over 100 yards while maintaining a simple single-aiming-point device
2Reliability
If multiple adjustable sight pins are used for different target distances, then the accuracy range is extended, but the ease of operation deteriorates due to the need for real-time adjustments and distance estimation
Solution Approach 1:
The periscope sight is pre-configured with fixed mirror angles and spacing that correspond to a specific arrow velocity and launch angle. This preliminary configuration creates a sight line that naturally follows the arrow's trajectory, eliminating the need for the archer to perform real-time adjustments or estimate distances during the shooting process
3Speed
If the arrow is launched at a slight upward angle to overcome gravity, then the projectile can reach the target, but the line of sight must intersect the trajectory at only two points, limiting effective accuracy range
Solution Approach 1:
By elevating the apparent position of the aiming point through the periscope mirror system, the sight line becomes a straight line that can closely match the curved arrow trajectory over an extended distance range. This dimensional change allows multiple intersection points along the flight path, converting the limited two-point accuracy into extended multi-point accuracy
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 solution provides accurate arrow placement within 2 inches of error over a wide range (10 to 30 yards) without requiring further calibration, simplifying the aiming process and reducing user error by aligning the sight with the arrow's trajectory.
Implementation Method 1
a periscope including a fixed set of mirrors disposed in relation to each other and arranged as in a periscope
Data Source
AI summary
A sight for a projectile launching device, such as an archery bow, that enables a viewing line of sight which closely matches a portion of a curved projectile path of flight to attain an extended accuracy range. The sight includes a set of mirrors arranged periscopically and mounted to the launching device. For example, the sight can be provided integrally or through mounting to an archery bow in the location and manner of traditional aiming point pin sights.