Holster Coil Sensor for Automatic Gun-Draw Recording Trigger
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Solution Overview
Problem
Existing body-worn recording devices for security personnel require manual activation, which can lead to missed recordings during emergencies due to the need to pull out and hold a gun, and the devices often have limited battery life for long-term recording.
Innovation Solution
A sensor device with stacked coil sets is integrated into a holster sensing system and a video-recording system, allowing for automatic activation of the recording device when a gun is pulled out of the holster, utilizing a control unit and sensing module to detect metal items and transmit trigger signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual activation of the recording device is required, then the device can be activated only when recording is needed, but the police officer may forget to activate it or fail to record critical images in time during emergencies
Solution Approach 1:
The recording device is pre-configured and automatically activated when the gun is removed from the holster, eliminating the need for manual activation during emergencies. This preliminary setup ensures recording starts immediately when needed without requiring the officer to remember or manually initiate it.
Solution Approach 2:
The system uses the gun-holster interaction itself as the trigger for activation. The removal of the gun from the holster automatically initiates recording, making the system self-activating based on the officer's natural actions without requiring separate manual control.
2Volume of moving object
If the recording device is kept small-sized, then it can be body-worn conveniently, but the battery capacity is limited and cannot meet long-term recording needs
Solution Approach 1:
The system is divided into separate components: a small body-worn recording device with limited battery life and a larger base station with power supply and data storage capabilities. This segmentation allows the wearable unit to remain compact while the system as a whole provides extended operation through the base station's resources.
Solution Approach 2:
The base station acts as an intermediary that provides extended power and data storage capabilities to the small recording device. The recording device can offload data and recharge at the base station, effectively extending its operational duration without increasing its own size.
3Measurement precision
If the sensing module uses a stacked coil structure with reference and induction coil sets, then metal item detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The reference coil and induction coil are designed with different characteristics - the reference coil provides a stable baseline while the induction coil is optimized for detecting changes when metal is present. This asymmetric design allows the system to achieve high detection accuracy by comparing the two different coil responses.
Solution Approach 2:
The stacked coil structure serves multiple functions: the reference coil provides a stability reference, the induction coil detects metal presence, and together they enable automatic triggering of the recording device. This multi-functionality consolidates several capabilities into a single sensing module design.
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 ensures that critical events are automatically recorded, reducing the likelihood of missed recordings during emergencies, and the sensor device's independent power supply and operation capability enhance its reliability and usability.
Implementation Method 1
The induction coil set includes two second coils disposed on two sides of a second substrate. The physical quantity difference is an inductance change between the induction coil set and the reference coil set
Implementation Method 2
The reference coil set that is relatively away from the object provides a reference level. The physical quantity difference is an inductance change between the induction coil set and the reference coil set
Implementation Method 3
The control unit relies on a physical quantity difference between a sensing value generated by the induction coil set and the reference level provided by the reference coil set to determine whether a metal item disposed on the other side of the object is present
Data Source
AI summary
A sensor device, a holster sensing system, and a video-recording system are provided. The sensor device includes a control unit and a sensing module. The sensing module includes a reference coil set and an induction coil set that are arranged in a stacked structure. The sensing device is fixed on a holster. The induction coil set is configured to be adjacent to the holster. The control unit determines whether a gun is in the holster according to an inductance change between a sensing value generated by the induction coil set and a reference level provided by the reference coil set. In an application of the video-recording system, the control unit transmits a trigger signal to a recording device if the gun is determined to be pulled out of the holster according to the inductance change, so that the recording device is activated to start recording.