Firearm Magazine Hall Switch Layout for Accurate Round Counting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current round counting systems for firearms are inaccurate due to reliance on analog magnetic field sensors prone to low signal-to-noise ratios and require calibration, with sensors located outside the magazine, leading to diminished magnetic field strength and inconsistent readings.
Innovation Solution
The implementation of Hall effect switches along the full length of the follower path within the magazine, combined with a Near Field Communication (NFC) antenna and processor for signal processing, enables consistent signal strength and eliminates the need for calibration, while energy harvesting from a firearm battery powers the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If analog magnetic field sensors are used outside the magazine, then the system can detect follower position, but the magnetic field strength is diminished and signal-to-noise ratio is low
Solution Approach 1:
Instead of placing sensors outside the magazine to detect the magnet on the follower, the patent inverts the approach by placing multiple magnetic switches inside the magazine along the follower's path. The follower with its magnet passes by these switches, and the switches detect the magnet's position as it moves through the magazine, thereby maintaining strong magnetic field strength and high signal-to-noise ratio.
Solution Approach 2:
The patent divides the detection function into multiple segments by placing several magnetic switches at different positions along the follower's path inside the magazine. Each switch detects a specific position of the follower, and by combining the signals from multiple switches, the system achieves accurate round counting with high signal strength at each detection point.
2Ease of manufacture
If sensors are placed outside the magazine, then installation is simpler, but calibration is required to achieve accurate readings
Solution Approach 1:
The system with magnetic switches inside the magazine is self-calibrating. As the follower with its magnet passes by the predetermined positions of the magnetic switches, the system automatically learns and records the correlation between switch activation patterns and follower positions. This eliminates the need for external calibration procedures while maintaining accurate round counting.
3Measurement precision
If multiple magnetic switches are placed inside the magazine, then signal strength and accuracy improve, but device complexity increases
Solution Approach 1:
The magnetic switches serve multiple functions: they detect follower position, determine round count, and provide calibration data. By making the detection system multi-functional, the patent reduces the need for additional separate components, thereby improving measurement precision without proportionally increasing overall device complexity.
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 approach provides a reliable, accurate, and low-power round counting system with reduced signal noise and no calibration requirements, overcoming decades-old challenges in firearm round counting technology.
Implementation Method 1
The implementation of Hall effect switches along the full length of the follower path within the magazine
Implementation Method 2
a first NFC antenna in the magazine configured to wirelessly receive power from the firearm and transmit data to a second NFC antenna on the firearm
Data Source
AI summary
This disclosure describes systems, methods, and apparatus for detecting and displaying a number of rounds in a firearm magazine comprising a maximum number of N rounds. The magazine may comprise a follower, magnets on the follower, and <N magnetic switches arranged along a path of the magnets when the follower moves along a length of the magazine, the switches configured to activate based on a magnetic field exceeding a threshold, and a first antenna arranged on an inside of the magazine and parallel to a firing direction of the firearm, and configured to wirelessly transmit a round count indication to a second antenna on the firearm, the round count indication based on the round count data, the second antenna affixed to an inside of a magazine well of the firearm and mostly overlapping with the first antenna.