Firearm Magazine Round Counting with Hall Effect Sensors
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Solution Overview
Problem
Existing firearm magazine round counting systems suffer from inaccurate readings due to low signal-to-noise ratios, material interference, and the need for user calibration, particularly when sensors are located outside the magazine, leading to unreliable and cumbersome solutions.
Innovation Solution
The system employs Hall effect switches arranged along the full length of the follower path within the magazine, combined with a processor and a Near Field Communication (NFC) antenna within the magazine well, to provide consistent signal strength and wireless data transmission, while using energy harvesting from the firearm to minimize power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sensors are located outside the magazine, then device complexity is reduced, but measurement precision deteriorates due to low signal-to-noise ratios and material interference
Solution Approach 1:
Instead of placing sensors outside the magazine to simplify the device, the patent inverts the approach by placing sensors inside the magazine well. This allows the sensors to be positioned closer to the magnetic source (follower with magnet) while still maintaining a relatively simple overall device structure. The inversion of the conventional sensor placement strategy resolves the contradiction by achieving both simplicity and precision.
Solution Approach 2:
The patent introduces an intermediary magnetic field as the medium between the follower and the sensor. By using magnetic field sensing instead of direct mechanical contact or optical methods, the system can accurately detect follower position through the magazine structure without requiring complex external sensor arrangements. The magnetic field acts as an intermediary that penetrates materials, overcoming interference issues.
2Measurement precision
If sensors are placed along the full length of the follower path within the magazine, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent replaces a complex mechanical sensor array with an electronic magnetic field sensing system. Instead of using multiple mechanical switches or contacts along the follower path, a single magnetic sensor detects the position of the magnet on the follower by measuring changes in magnetic field strength. This substitution dramatically reduces device complexity while maintaining high measurement precision throughout the full follower path.
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength, direction) as the follower moves along its path. By monitoring the magnetic field parameter variations rather than using discrete position sensors, the system achieves continuous precise measurement with minimal hardware. The parameter change approach converts a potentially complex spatial measurement problem into a simple field intensity detection task.
3Reliability
If a battery is included in the magazine for sensor power, then reliability improves, but weight increases
Solution Approach 1:
The patent makes the magazine well serve multiple functions: it acts as both the structural container for ammunition and as the housing for the sensing and power components. By integrating the sensor and battery into the existing magazine well structure rather than adding separate dedicated housings, the system achieves reliable operation without significant weight increase. The multi-functional design allows the same structural elements to support both ammunition storage and electronic components.
Solution Approach 2:
The patent nests the sensor and battery components within the existing magazine well structure. Instead of adding external components that would increase weight, the electronic components are embedded within the hollow space already present in the magazine design. This nesting approach allows reliable power and sensing functionality to be incorporated with minimal additional weight, as the components occupy otherwise unused internal volume.
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 achieves accurate, lightweight, and reliable round counting without user calibration, by ensuring consistent magnetic field strength and reducing the need for external power sources, thus enhancing the precision and usability of the round counting system.
Implementation Method 1
a first magnetic sensor (504) of the plurality of magnetic sensors positioned adjacent the first channel, the first magnetic sensor configured to detect a change in magnetic field strength of the magnet (108)
Implementation Method 2
a first antenna (503) positioned within a magazine well of the firearm; a second antenna (509) positioned within the magazine (104), the second antenna configured to wirelessly transmit the round count indication from the magazine (104) to the firearm
Data Source
AI summary
A round-counting magazine may include a housing, the housing having a proximal end and a distal end. It may further include a follower having at least one magnet, a plurality of indentations formed in a first channel on a first side of the housing, wherein each indentation comprises a magnetic sensor, and wherein the first channel is positioned adjacent a path of the at least one magnet when the follower moves along a length of the housing. The magazine may further include at least one side cover positioned over the first channel and thereby protecting the magnetic sensors. A floor plate assembly on a bottom of the magazine may include a floor plate including a receptacle and a lock plate, where the receptable is shaped and sized to receive at least one power source and at least a portion of the lock plate.