Resistive Strip Potentiometer for Firearm Magazine Round Counting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional round counting systems in firearms face challenges such as reduced accuracy in long guns due to limited sensor reach, heat-induced sensitivity issues, and electronic noise interference, particularly in Hall effect sensor-based systems, which are costly and complex.
Innovation Solution
A resistive strip membrane potentiometer sensor system is used, where a non-conductive wiper attached to the follower moves along the magazine, connecting circuits to generate a varying output voltage based on position, providing accurate and reliable round count data with minimal components and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Hall effect sensors are used in long guns, then magnetic field detection is achieved, but the magnetic field is greatly reduced before reaching the sensors and accuracy deteriorates
Solution Approach 1:
The patent replaces Hall effect magnetic sensors with capacitive strip encoder sensors that use electrical fields instead of magnetic fields. This substitution eliminates the problem of magnetic field reduction over distance, as capacitive sensors can accurately detect follower position even when the follower is farther away in long gun applications.
Solution Approach 2:
The patent changes the detection parameter from magnetic field strength to capacitance change. By measuring capacitance variations as the follower moves along the magazine, the system achieves accurate position detection without being affected by magnetic field attenuation.
2Reliability
If Hall effect sensor systems are used, then round counting is achieved, but heat affects conductor resistance and sensitivity performance deteriorates
Solution Approach 1:
The patent replaces magnetic field-based Hall effect sensors with capacitive sensors that measure electrical field changes. Capacitive measurements are less sensitive to temperature-induced resistance changes in conductors, maintaining reliable round counting even when firearms generate heat during operation.
3Measurement precision
If analog magnetic sensors are used, then magnetic field detection is achieved, but electronic noise interference increases and measurement precision deteriorates
Solution Approach 1:
The patent replaces analog magnetic sensor detection with capacitive strip encoder detection. The capacitive system uses high frequency reference signals to measure capacitance changes, which are less susceptible to electronic noise interference, thereby improving the signal to noise ratio and measurement precision.
4Measurement precision
If conventional round counting systems are used, then round count data is obtained, but device complexity and cost increase
Solution Approach 1:
The patent extracts the essential function of follower position detection from complex magnetic sensor systems and implements it using simpler capacitive strip encoders. This extraction of the core detection function eliminates unnecessary magnetic field generation components and simplifies the overall system architecture.
Solution Approach 2:
The patent employs capacitive strip encoders that are less expensive and require fewer components than Hall effect magnetic sensor systems. The simplified design reduces both manufacturing cost and system complexity while maintaining accurate round count data acquisition.
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
The system offers improved accuracy, immunity to stray magnetic fields, and cost-effectiveness by using a resistive strip membrane potentiometer sensor, providing robust and reliable round counting with reduced electronic noise interference and heat sensitivity issues.
Implementation Method 1
A resistive strip membrane potentiometer sensor arranged substantially along a length of the magazine and configured to generate an output voltage when a first and a second circuit are connected by applying pressure to a surface of the sensor. The output voltage varies based on a position where the pressure is applied to the surface of the sensor
Implementation Method 2
A wiper is configured to apply pressure to the surface of the sensor and to connect the first and second circuits. The wiper is a non-conductive mechanism attached to the follower and configured to move along the length of the magazine corresponding to the resistive strip membrane potentiometer sensor
Data Source
AI summary
The subject matter described herein includes methods, systems, and computer program products for determining an ammunition round count by resistive encoding. According to one embodiment, a system for providing an indication of a number of rounds of ammunition in a magazine of a firearm includes a follower for the rounds to rest upon, where the follower is internal to the magazine and pushes the follower and the rounds toward a mouth of the magazine to facilitate feeding the rounds into the firearm. The system also includes a resistive strip membrane potentiometer sensor arranged substantially along a length of the magazine that generates an output voltage when a first and a second circuit are connected by applying pressure to a surface of the sensor. The output voltage varies based on a position where the pressure is applied to the surface of the sensor and the first and second circuits are connected. A power source, such as a battery or AC/DC adapter, applies power to the system which contains a constant current source to generate and provide an input voltage to the resistive strip membrane potentiometer sensor. A wiper applies pressure to the surface of the sensor and connects the first and second circuits. The wiper is a non-conductive mechanism attached to the follower and configured to move along the length of the magazine corresponding to the resistive strip membrane potentiometer sensor. A round counter converts the output voltage generated by the resistive strip membrane potentiometer sensor into an indication of the number of rounds of ammunition in the firearm magazine (“round count data”).