Magazine Hall Switch Encoding for Accurate Firearm Round Count
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Solution Overview
Problem
Existing firearm round counting systems suffer from inaccurate and unreliable readings due to the use of Hall effect sensors outside the magazine, which are prone to low signal-to-noise ratios and require user calibration, and lack a practical wireless communication solution between the magazine and firearm.
Innovation Solution
Implementing Hall effect switches along the full length of the magazine follower path, placing sensors within the magazine for consistent signal strength, using a flat NFC antenna in the magazine well for wireless communication, and incorporating a processor within the magazine to process sensor signals before transmission, with energy harvesting from the firearm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If Hall effect sensors are placed outside the magazine, then the system structure is simpler, but the signal-to-noise ratio is low and readings are inaccurate
Solution Approach 1:
Instead of placing sensors outside the magazine to simplify structure, the patent inverts the approach by placing Hall effect switches inside the magazine body. This internal placement ensures strong magnetic field detection from the follower magnet, achieving high measurement precision while maintaining reasonable structural complexity through integration with the magazine floorplate.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the follower position and the sensing system. Hall effect switches detect the magnetic field generated by the magnet on the follower, converting mechanical position information into electrical signals. This intermediary approach enables accurate non-contact detection of round count while maintaining system reliability.
2Ease of manufacture
If Hall effect sensors are placed outside the magazine, then installation is easier, but user calibration is required and readings are unreliable
Solution Approach 1:
The system performs self-calibration through its design: the Hall effect switches are positioned to detect the magnetic field from the follower magnet at specific positions (empty magazine, full magazine). The processor automatically determines the number of switches required based on magazine capacity and configures the counting logic without user intervention. This self-service approach eliminates the need for manual calibration while ensuring reliable readings.
3Measurement precision
If sensors are placed within the magazine, then signal strength is consistent, but wireless communication between magazine and firearm is challenging
Solution Approach 1:
The wireless communication system is segmented into two independent parts: an NFC antenna integrated into the magazine body for data transmission, and a corresponding NFC reader in the firearm. This segmentation allows the magazine to function as a standalone smart card, simplifying the overall system architecture while maintaining consistent signal strength from internally placed sensors.
Solution Approach 2:
The patent replaces complex wired connections or long-range wireless communication with Near Field Communication (NFC) technology. NFC provides short-range, reliable wireless communication between the magazine and firearm without requiring physical connectors, thereby maintaining signal consistency while avoiding the complexity of traditional wired or long-range wireless systems.
4Productivity
If a wireless communication system is implemented, then real-time round count monitoring is enabled, but power consumption increases
Solution Approach 1:
The wireless communication operates periodically rather than continuously. The NFC antenna in the magazine transmits round count data only when triggered by specific events (e.g., magazine insertion, follower movement detected by Hall effect switches). This periodic action enables real-time monitoring capability while minimizing power consumption by keeping the system in a low-power state between transmissions.
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 accurate, low-power, and reliable round counting with reduced errors, eliminating the need for user calibration and enabling lightweight, efficient wireless data transmission.
Implementation Method 1
Hall effect switches arranged substantially along a path of the one or more magnets, where N is a maximum number of cartridges that can be loaded in the magazine, the Hall effect switches each generating a high or low signal based on a position of the one or more magnets relative to each of the Hall effect switches
Implementation Method 2
a flat NFC antenna in the magazine well for wireless communication
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-field-sensing sensors arranged along a path of the magnets when the follower moves along a length of the magazine, the sensors generating round count data based on a position of the one or more magnets relative to the <N magnetic-field-sensing sensors, and a first substantially flat antenna arranged on an inside of the magazine and configured to wirelessly transmit a round count indication to a second substantially flat antenna on the firearm, the round count indication based on the round count data, the second substantially flat antenna affixed to an inside of a magazine well of the firearm and mostly overlapping with the first substantially flat antenna.