Motion Switch Threshold Logic for False Activation Control
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Solution Overview
Problem
Existing motion-activated switches for firearm-mounted light sources and laser sights are prone to unintended activation and deactivation, making them unreliable and potentially hazardous in tactical situations due to difficulties in distinguishing between intended and unintended motion signals.
Innovation Solution
A motion-activated switch system utilizing algorithms that incorporate Moving Averages and Integral Counters to differentiate between intended and unintended activation and deactivation signals, allowing for precise control through Angle-On and Cast-On modes, which activate or deactivate the device based on specific motion patterns and thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If motion switches are used to automatically activate or deactivate devices, then ease of operation is improved, but reliability deteriorates due to unintended activation and deactivation
Solution Approach 1:
The patent applies dynamics by making the activation thresholds configurable and adaptable. The system allows users to set specific acceleration thresholds that distinguish between intended activation (drawing the weapon) and unintended activation (holstering or normal movement). This dynamic adjustment of thresholds resolves the contradiction by enabling automatic operation while reducing false triggers through personalized calibration.
Solution Approach 2:
The patent changes parameters by introducing configurable acceleration thresholds and direction vectors. Instead of using fixed thresholds that cause unintended activation, the system allows parameter adjustment based on user-specific movement patterns. This enables the device to distinguish between holstering motions and drawing motions, thereby improving reliability while maintaining ease of operation.
2Ease of operation
If inertial switches are used to sense motion, then ease of operation is improved, but reliability deteriorates due to rebound effect causing premature deactivation
Solution Approach 1:
The patent applies preliminary action by establishing a minimum duration threshold for activation. When the device detects motion exceeding the acceleration threshold, it requires the motion to persist for a predetermined time period before activating or deactivating the device. This preliminary time-based verification prevents premature deactivation caused by rebound effects, as the system waits to confirm whether the motion is intentional and sustained.
Solution Approach 2:
The system dynamically adjusts the response based on the duration and characteristics of detected motion. Rather than immediately responding to any acceleration event, the system evaluates the temporal profile of the motion to determine whether it represents a legitimate activation or deactivation command, thereby preventing false responses to rebound effects.
3Ease of operation
If motion sensors are used to detect activation signals, then ease of operation is improved, but measurement precision deteriorates due to inability to distinguish intended versus unintended signals
Solution Approach 1:
The patent applies local quality by analyzing specific characteristics of the motion signal, such as acceleration direction, magnitude, and duration, rather than treating all motion equally. The system evaluates the local properties of each detected motion event to determine whether it represents an intended activation (e.g., drawing the weapon with specific acceleration profile) or unintended activation (e.g., holstering or walking). This localized analysis improves measurement precision while maintaining automatic switching.
Solution Approach 2:
The system incorporates feedback by using the detected motion characteristics to adjust and refine activation decisions. By monitoring the acceleration patterns and comparing them against configured thresholds and time durations, the system provides feedback-based discrimination between intended and unintended signals, thereby improving measurement precision without requiring complex additional hardware.
4Reliability
If buttons are used to activate devices, then reliability is improved by requiring intentional action, but ease of operation deteriorates due to extra steps and accessibility issues
Solution Approach 1:
The patent replaces the mechanical button-pressing system with a motion-based detection system. Instead of requiring physical contact with a button, the system uses accelerometers to detect the characteristic motion of drawing the weapon from the holster. This substitution maintains reliability by requiring intentional action (the deliberate motion of drawing) while dramatically improving ease of operation by eliminating the need to locate and press a button under stress.
Data Source
AI summary
An algorithm analyzes the motion of an object to determine if a switch needs to be activated or deactivated. Accelerometers measure forces exerted upon an object to determine orientation in pitch, roll, and yaw axes, and to determine motion of the object. When threshold conditions for these orientations and movements are measured, the method combines taking moving averages of pitch, roll, and yaw, and additionally accumulating an integral of yaw to determine if an activation or deactivation condition is met. Should an integral condition not be constantly met while the moving average conditions are being determined, the yaw integral counter resets and the whole process must begin again. This method balances most unintentional activation conditions with activation latency. Another methodology tracks the motion of a wrist flick, similar to casting a fishing line, using acceleration and deceleration parameters.