Sensing device, holster sensing system and video recording system

Abstract

A sensing device, a holster sensing system and a video recording system, the sensing device comprising a control unit and a sensing module, the sensing module comprising a reference coil assembly and an induction coil assembly arranged in a stacked structure, the sensing device being fixable on a holster and making the induction coil assembly in the sensing module close to the holster, the control unit can judge whether a gun exists in the holster or not according to the change of an inductance value between an induction value generated by the induction coil assembly and a reference level provided by the reference coil assembly. In the application of the video recording system, it is judged that the gun is pulled out of the holster according to the change of the inductance value, and the control unit sends a trigger signal to the video recording device to enable the video recording device to start video recording.

Description

Technical Field

[0001] The specification discloses a sensing device and its application, in particular, a sensing device with a stacked coil group, and a holster sensing system and a video recording system using the sensing device. Background Art

[0002] Currently, security guards, soldiers and police who are required to carry guns or any weapons often wear body-worn video devices at the same time, which can fully record the images of personnel using guns or specific weapons. This can be used to resolve disputes arising from the use of guns in the future. In further applications, the images can be transmitted to a control center that can support duties, and can quickly provide assistance during emergencies.

[0003] In the prior art, a person wearing a body-worn video recorder needs to operate the body-worn video recorder to record a video by himself, but the body-worn video recorder is generally small in size and therefore has a small battery capacity, which cannot cope with the need for long-term video recording. Therefore, the recording function can be activated when recording is needed, but the person may still forget to activate the recording in dangerous situations, or fail to record key images in time, thus limiting the function of the body-worn video recorder.

[0004] One of the situations where video recording is required is when the police determine that they need to draw their guns. In this case, the police need to activate the camera function of the body-worn video device. However, when the incident is an emergency, the police usually need to draw their guns and hold their guns immediately, and therefore may not be able to immediately activate the video recording function of the body-worn video device. Summary of the invention

[0005] In order to propose a solution that can be linked with an emergency event and activate related peripheral operations in real time, the specification proposes a sensing device for detecting a specific emergency event, and a holster sensing system and a video recording system using the sensing device.

[0006] The main components of the sensing device include a control unit and a sensing module. The sensing module includes two coil groups, including a reference coil group and an induction coil group. The two coil groups can be stacked in a structural design. The sensing device is used to be fixed on one side of an object, and the induction coil group is brought close to the object, and the reference coil group that is relatively far from the object provides a reference level. Furthermore, the induction area of ​​the reference coil group can be smaller than the induction area of ​​the induction coil group. The control unit will determine whether a metal object exists on the other side of the object based on a physical quantity difference between the induction value generated by the induction coil group and the reference level provided by the reference coil group.

[0007] Preferably, the reference coil group includes two coils arranged on both sides of the first substrate, and the induction coil group includes two coils arranged on both sides of the second substrate. The physical quantity difference is a change in inductance between the induction coil group and the reference coil group, so that the control unit can determine whether the metal object exists according to the electrical signal formed by the change in inductance.

[0008] Furthermore, the sensing device also includes a communication unit for transmitting a trigger signal generated by the control unit according to the physical quantity difference; it may also include a power supply unit, which is controlled by the control unit to provide a current signal to the sensing module so that the induction coil group and the reference coil group generate an induced magnetic field.

[0009] According to one embodiment, the sensing module is implemented as a proximity sensor or a differential inductance switch, and current is introduced to the two coil groups of the sensing module through the power supply unit. The reference coil group and the induction coil group will respectively form different effective sensing ranges and generate reference inductance and induction inductance respectively.

[0010] Furthermore, the design that the inductive area of ​​the reference coil group is smaller than the inductive area of ​​the inductive coil group is used to reduce the inductance change caused by the metal object approaching the reference coil group.

[0011] Furthermore, when a metal object approaches or moves away from one side of the induction coil group, the inductance of the induction coil group and the reference coil group changes, and the inductance of the induction coil group will be lower or higher than the inductance of the reference coil group, so that the sensing module receives the physical quantity difference and outputs a sensing result.

[0012] Furthermore, in a control method, the control unit may perform a frequency control through pulse width modulation to achieve frequency control and enable the sensing module to detect the inductance value generated by the induction coil group and the reference coil group.

[0013] According to an embodiment of a holster sensing system using a sensing device, the holster sensing system includes a holster for accommodating a gun, and the gun is provided with a metal object that can be sensed by the sensing device. The holster sensing system also includes the sensing device, which is disposed on the holster, and the position of the sensing device corresponds to the position of the metal object when the gun is holstered.

[0014] According to the design of the sensing device, the induction coil group is located close to the holster, and the reference coil group is relatively far away from the holster. In this way, the control unit can determine whether there is a metal object on the gun in the holster based on a physical quantity difference between the induction value generated by the induction coil group and the reference level provided by the reference coil group.

[0015] Afterwards, according to the sensing result generated by the sensing module, it can be determined that the gun is pulled out of the holster, and the control unit generates a trigger signal. When it is determined that the gun is out of the holster for a time period exceeding a threshold, the sensing device can enter a power saving mode.

[0016] According to an embodiment of a video recording system using a sensing device, the video recording system includes a video recording device, a holster and a sensing device. The video recording device is provided with a communication module and a camera module. The holster is used to accommodate a gun. The gun has a metal object that can be sensed. The sensing device is arranged on the holster. The position of the sensing device corresponds to the position of the metal object when the gun is put into the holster.

[0017] When the sensing device is in operation, when a metal object approaches or moves away from one side of the induction coil group, the inductance of the induction coil group in the sensing device will be lower or higher than the inductance value of the reference coil group. At this time, the sensing module receives the physical quantity difference, that is, outputs the sensing result; when the sensing result shows that the gun is pulled out of the holster, the control unit sends a trigger signal to the communication module of the video recording device through the communication unit to activate the camera module to start recording.

[0018] Furthermore, once the gun is determined to be removed from the holster according to the sensing result, the control unit sends a trigger signal to start the video recording device, and when it is determined that the gun is removed from the holster for a time period exceeding a threshold, the sensing device enters a power saving mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram showing an embodiment of a circuit component of a display sensing device;

[0020] Figure 2 A schematic diagram showing an embodiment of a gun sensing system implemented by a sensing device;

[0021] Figure 3 A schematic diagram showing an embodiment of an induction coil group in a sensing device;

[0022] Figure 4 A schematic diagram showing the technical principle of using an induction coil to detect the presence of an object to be tested;

[0023] Figure 5 A flow chart showing an embodiment of using a sensing device to sense whether a gun exists;

[0024] Figure 6 A diagram showing an embodiment of a circuit design in a display sensing device;

[0025] Figure 7 A schematic diagram showing a structural embodiment of a sensing device;

[0026] Figure 8 A schematic diagram showing a second structural embodiment of a sensing device;

[0027] Fig. 9A and Fig. 9B A third schematic diagram showing a structural embodiment of a sensing device; and

[0028] Fig.10 Four schematic diagrams showing the structural embodiment of the sensing device. DETAILED DESCRIPTION

[0029] This specification proposes a sensing device that can be attached to a specific object. The sensing device has an independent power supply and operation capability, and can be separately set on a specific object to detect the movement state of the specific object using the inductive sensing principle. The specification also proposes a gun sensing system and a video recording system using the sensing device.

[0030] Figure 1 A schematic diagram showing an embodiment of a circuit component of a sensing device.

[0031] Figure 1 An embodiment of a sensing device 100 is shown in FIG. 1 , wherein the circuit includes a control unit 103 and other circuit components electrically connected to the control unit 103, such as a sensing module 101. The main structural feature of the sensing module 101 is two coil groups, such as Figure 1 The reference coil group 113 and the induction coil group 111 are shown as being arranged in a stacked structure, but the actual implementation is not limited to the stacked structure. Figure 3 Example shown.

[0032] According to an operation mode of the sensing device 100, the sensing device 100 is fixed on a surface of one side of an object by various fixing methods, and the induction coil group 111 in the sensing module 101 is close to the object, and the position of the reference coil group 113 is relatively far away from the object, so as to provide a reference level. In this way, when the position of the sensed specific object (preferably an object such as a metal sheet) changes, there will be a physical quantity difference between the induction value generated by the induction coil group 111 and the reference level provided by the reference coil group 113, so that the control unit 103 can judge whether the specific object on the other side of the object exists according to the physical quantity difference.

[0033] According to an embodiment, in Figure 1 In the circuit components shown, the sensing device 100 further includes a communication unit 107, which is electrically connected to the control unit 103. When the control unit 103 generates a trigger signal according to the physical quantity difference, the communication unit 107 transmits the trigger signal using a specific transmission protocol, such as a Bluetooth communication protocol. TM) implements a Bluetooth Low Energy (BLE) technology to broadcast the trigger signal in a broadcasting manner; other ways to transmit the trigger signal can also use wireless local area network (WiFi TM ) and near-field communication (NFC) technology, etc. The actual implementation is not limited to the listed communication technologies.

[0034] Furthermore, the sensing device also includes a power supply unit 105, which is electrically connected to the control unit 103 and controlled by the control unit 103. The power supply unit 105 provides a current signal to the sensing module 101 through the control unit 103, so that the induction coil group 111 and the reference coil group 113 respectively generate an induced magnetic field that can cover the object to be detected.

[0035] An embodiment of using the above-mentioned sensing device having independent power supply, communication function and signal processing capability and capable of independent operation can refer to Figure 2 The schematic diagram of an embodiment of a gun sensing system is shown. Figure 2 It further shows the video recording system that can operate in conjunction.

[0036] Figure 2 The gun sensing system shown in the figure mainly includes a holster 200 and a sensing device 100 arranged on the outer surface of the holster 200. The holster 200 is used to accommodate the gun 210. The sensing device 100 is used to sense the movement of the gun 210. One way is to provide a magnetic object that can be sensed on the gun 210, such as a metal object 211, and make the position of the sensing device 100 on the holster 200 correspond to the position of the metal object 211 when the gun 210 is put into the holster 200. That is, when the gun 210 is placed in the holster 200, the position of the metal object 211 needs to be at a position that can be sensed by the sensing device 100.

[0037] refer to Figure 1 and Figure 2 When the gun sensing system is in operation, the power supply unit 105 in the sensing device 100 provides a current signal to the sensing module 101 in the sensing device 100 through the control unit 103, so that the induction coil group 111 and the reference coil group 113 generate an induced magnetic field, and the induced magnetic field range should cover the metal object 211. According to the embodiment, the induction coil group 111 in the sensing device 100 is located close to the holster 200, and the reference coil group 113 is relatively far away from the holster 200.

[0038] When the gun 210 with the metal object 211 attached is moved away, such as when the gun 210 is pulled out of the holster 200, the metal object 211 is displaced. At this time, a physical quantity difference is generated between the induction value generated by the induction coil group 111 and the reference level provided by the reference coil group 113. The physical quantity difference is the change in the inductance value between the induction coil group 111 and the reference coil group 113, so that the control unit 103 in the sensing device 100 determines whether the metal object 211 exists according to an electrical signal formed by the change in the inductance value, that is, it is possible to detect whether the gun 210 is pulled out or put back into the holster 200 in this way.

[0039] According to one embodiment, when the inductance change between the induction coil set 111 and the reference coil set 113 of the sensing device 100 reaches a threshold value set by the system, the control unit 103 of the sensing device 100 generates a trigger signal, which can be transmitted to devices near the sensing device 100 by broadcasting, such as Figure 2 After the trigger signal is received by the communication module 221 in the video recording device 220, the camera module 223 can be activated to start shooting images through the control method therein. In this way, the purpose of activating the video recording device 200 in real time when it is determined that the gun 210 is detached from the holster 200 is achieved.

[0040] Figure 3 A schematic diagram showing an embodiment of the main circuit components and the induction coil assembly in the sensing device.

[0041] The figure shows the main circuit components in the sensing device, such as the control unit 103 and the sensing module 101. The control unit 103 has signal processing capabilities and is electrically connected to the sensing module 101. The connection lines 301, 302, 303 on the induction coil in the sensing module 101 can obtain the induction value L generated by the sensing module 101. SENSE With reference level L REF , and provide a common ground signal L COM .

[0042] This example shows a reference coil group 113 and an induction coil group 111 in a stacked structure in a sensing module 101, wherein the reference coil group 113 includes a first reference coil 313 and a second reference coil 314 disposed on both sides of a substrate. The figure shows that the middle points of the two coils are electrically connected to each other and provide a reference level L REF The induction coil assembly 111 includes a first induction coil 311 and a second induction coil 312 disposed on both sides of another substrate. Similarly, the figure shows that the middle points of the two coils are electrically connected to each other, generating an induction value L SENSEThe output ends of the reference coil group 113 and one of the coils of the induction coil group 111, such as the second induction coil 312 and the first reference coil 313 in the example, jointly form a common ground signal L COM . It should be noted that the above-mentioned embodiments do not limit the implementation of the sensing module 101 proposed in the specification. The reference coil group 113 in the sensing module 101 may include one, two or more layers of reference coils; similarly, the induction coil group 111 in the sensing module 101 may include one, two or more layers of induction coils. The number of coils in the reference coil group 113 and the induction coil group 111 is determined according to the design value of the coil equivalent inductance under the same substrate area. For example, when the sensing module uses a smaller substrate, such as a substrate with a diameter of two centimeters, if the system requires a larger inductance value, two or more layers of coils are required to meet the requirement.

[0043] Thus, in the sensing device shown, the sensing module 101 implements a proximity sensor or a differential inductive switch, and a current is introduced to the two coil groups (311, 312, 313, 314) of the sensing module 101 through a power supply unit (not shown in this figure) in the sensing device, so that the reference coil group 113 and the induction coil group 111 respectively form different effective sensing ranges and generate reference inductance and induction inductance respectively.

[0044] According to the operating principle of the differential inductive switch, after the current is introduced into the two coil groups in the sensing device, an electromagnetic field will be formed around each coil group, and the two coil groups will form different effective sensing ranges. When an external metal object (such as a metal object attached to a gun) approaches the sensing range of the inductive proximity switch, the electromagnetic field formed by the inductive proximity switch around each coil group is disrupted, and the impedance on each coil is changed. In this way, a reference voltage is formed in the reference coil group, and an induced voltage is formed on the induction coil group, so that the relevant control circuit calculates the differential signal generated between the two coil groups and outputs a comparison value, which can be represented by a high level or a low level, so as to provide the control circuit with a judgment on whether the metal object exists.

[0045] During operation, whenever the control unit enables the sensing module using pulse width modulation technology, which is actually to activate the proximity sensor or differential inductance switch, it will detect and compare the inductance difference between the reference coil group and the induction coil group. The sensing module then switches the output high or low voltage according to whether the inductance difference is positive or negative.

[0046] In one embodiment, when the object to be sensed by the sensing device moves, such as when the gun 210 is pulled out of the holster 200 or the gun 210 is put back into the holster 200 in the above embodiment, the metal object 211 disposed on the gun 210 also moves together, and the sensing module 101 senses the change in inductance between the induction coil group 111 and the reference coil group 113. In other words, when the metal object 211 approaches or moves away from one side of the induction coil group 111, the inductance of the induction coil group 111 and the reference coil group 113 will change, and because the induction coil group 111 is closer to the metal object 211, the inductance of the induction coil group 111 will be relatively lower or higher than the inductance of the reference coil group 113, so that the sensing module 101 receives the difference in physical quantity and outputs a sensing result.

[0047] The physical quantity difference is the change in inductance between the induction coil group and the reference coil group. The control unit 103 can obtain the induction value L SENSE With the common ground signal L COM , and the reference level L REF With the common ground signal L COM The inductance value changes between the two regions, so that the control unit 103 can determine whether the metal object leaves the sensing area or enters the sensing area according to the electrical signal formed by the inductance value change.

[0048] The principle can be found in Figure 4 The schematic diagram of the technical principle of using an induction coil to detect whether the object under test exists is shown. It should be mentioned here that Figure 4 The control unit of the display sensing device is based on the sensing value L SENSE With reference level L REF The crossing point of the curve is used as the judgment of outputting a high potential or a low potential, thereby indicating that the control unit knows whether a metal object exists, that is, whether the metal object enters the designed sensing distance.

[0049] Figure 4 The sensing value L provided by the sensing device is displayed in SENSE , reference level L REF With the common ground signal L COM The inductance value changes as the object 400 (such as the metal object 211) moves. Figure 2 , where the object 400 is designed on the gun 210 and has an initial distance d from the sensing device 100 on the holster 200. The reference coil group provides a fixed reference level L REF , shown in the reference signal curve 403 (L REF ), and the inductance value generated by the induction coil group will change with the movement of the measured object 400, such as Figure 4The sensing signal curve 405 (L SENSE ). Figure 4 It is shown that when the object under test 400 and the induction coil group in the sensing device have relative motion, including moving away (moving toward the distance ∞) or approaching (moving toward the distance 0), the magnetic field formed by the induction coil group changes, that is, an induced current is formed inside the coil, and at the same time, an inductance effect is induced to generate a voltage to suppress the change of the current therein. In this way, when the induced current increases, the inductance resists the increase of the current; conversely, when the induced current decreases, the inductance resists the decrease of the current. That is, Figure 4 The induction signal curve 405 (L SENSE )’s change curve.

[0050] Therefore, the physical quantity difference is the change in the inductance between the induction coil group and the reference coil group. When it is determined that the object 400 (eg, the metal object 211) moves, the inductance between the induction coil group and the reference coil group is changed. Figure 4 The output signal curve 401 is like a switch signal. This example shows that when the object 400 (such as the metal object 211) is far away from the induction coil, the equivalent inductance of the induction coil group will be higher than the equivalent inductance of the reference coil group. Figure 4 The left half of the output signal curve 401 represents the induction value L SENSE Greater than reference level L REF On the contrary, when the object 400 (such as the metal object 211) is close to the induction coil, the equivalent inductance of the induction coil group will be lower than the equivalent inductance of the reference coil group, that is, Figure 4 The middle right half represents the induction value L SENSE Less than reference level L REF The sensing results.

[0051] Therefore, it will make Figure 3 The control unit 103 in the sensing device shown obtains the change value calculated by the sensing module 101 according to the inductance value generated by the induction coil group 111 and the reference coil group 113, determines whether a metal object exists according to the electrical signal, and generates an output signal OUTPUT at a specific pin of the control unit 103.

[0052] Thus, in the gun sensing system, when a metal object on the gun approaches or moves away from one side of the induction coil group, because the inductance of the induction coil group will be lower or higher than the inductance value of the reference coil group (such as the reference level), the control unit receives the sensing result from the sensing module, that is, the change in the inductance value between the induction coil group and the reference coil group, and can Figure 4 The output signal curve 401 displayed determines the time when the gun is pulled out of the holster or put back into the holster, and the control unit can activate the camera module to start recording or terminate recording accordingly.

[0053] Figure 5 A flow chart showing an embodiment of using a sensing device to sense whether a gun exists.

[0054] The sensing device is installed on the holster, and the metal object is attached to the gun. The sensing device is set corresponding to the position of the metal object. After the sensing device is started, it starts to detect the status of the gun (step S501). When the control unit obtains the sensing result from the self-sensing module, it determines whether the gun is detected to be pulled out from the holster (step S503). If the state of the gun being pulled out has not been detected (no), step S501 is still repeated; if it is determined that the gun is detached from the holster (yes), the control unit generates a trigger signal (step S505) and broadcasts the trigger signal through the communication unit (step S507). The trigger signal can record the event record of sensing the gun being pulled out and the timestamp of the event, so that the video recording device that receives this trigger signal can be started and start recording (step S509).

[0055] During the recording process of the video recording device, the sensing device continues to operate, and the control unit determines whether the gun (metal object) exists based on the electrical signal of the sensing module. In this step, it is mainly to determine whether the gun is put back into the holster (step S511). When it is not detected that the gun is put back into the holster (no), step S511 is still repeated; if it is determined that the gun is put back into the holster (yes), the process can return to the initial step S501. According to the embodiment, when it is determined that the gun is put into the holster based on the sensing result, the control unit can send a termination signal, and the termination signal can also be transmitted through broadcasting, so that the video recording device that receives the termination signal stops recording.

[0056] It is worth mentioning that the sensing device has a power saving mode. For example, in the above step S503, when it is determined that the gun is pulled out of the holster according to the sensing result, the control unit of the sensing device generates the trigger signal. At the same time, it will start timing and determine whether the time when the gun is pulled out exceeds a time threshold. If the time when the gun is pulled out exceeds the time threshold, the sensing device will enter a power saving mode. When the sensing device enters the power saving mode, that is, when the gun is out of the holster for more than the time threshold set by the system to broadcast the trigger signal, it stops sending the trigger signal to perform power saving control until the sensing module detects the gun again, indicating that the gun is placed in the holster. At this time, it will return to the control process of gun out detection and generating the trigger signal.

[0057] The circuit design of the sensing device can be found in the following figure. Figure 6 Example diagram of the display.

[0058] Figure 6 The sensing device 60 shown in the figure includes a main board 600 at one end. The main board 600 is used as a control circuit board of the sensing device 60. Various circuit components can be arranged on the main board 600. Figure 6 An indicator light (such as an LED) 601 is displayed for displaying the operating status of the sensing device 60, and a power supply unit (such as a battery) 603 is displayed for providing power to the sensing device 60. A power button 605, a control unit 607 and a communication unit 609 are also provided on the mainboard 600 of the sensing device 60.

[0059] The user can start or shut down the sensing device 60 through the power button 605. The communication unit 609 is used to transmit the signal generated by the control unit 607. The control unit 607 can be a microcontroller of the sensing device 60, which is used to control the operation of the sensing device 60 and determine whether the object to be detected exists according to the signal generated by the sensing module.

[0060] According to one embodiment, based on the power saving mechanism provided by the sensing device, the control unit 607 can run a timer pulse width modulation control technology (Timer PWM control), wherein the frequency control is performed through the pulse width modulation (Pulse Width Modulation) technology, and the frequency control can be realized. In addition to enabling the sensing module in the sensing device 60 to obtain the inductance value generated by the induction coil group and the reference coil group, the control unit 607 can also enter a power saving mode (MCU Sleep Mode) under certain circumstances (such as the gun is out of the holster for a long time), such as turning off the communication function or reducing the operating frequency.

[0061] The main board 600 is electrically connected to the first substrate 621 of the reference coil group and the second substrate 622 of the induction coil group through electrical connection terminals 611 and 613. The reference coil group includes two reference coils 623 and 625 disposed on both sides of the first substrate 621, and the induction coil group includes induction coils 627 and 629 disposed on both sides of the second substrate 622.

[0062] The sensing module is designed with coils on both sides in a stacked structure to form an induction magnetic field, which will cover the object to be measured, such as a metal object. When the object to be measured moves, the equivalent inductance of the induction coil will change. Furthermore, for the induction coil group and the reference coil group of the stacked structure, when the object to be measured approaches, the equivalent inductance of the coil groups on both sides will change due to the induction of the object to be measured. Due to the structural design, the change in the equivalent inductance of the induction coil group will be greater than the change in the equivalent inductance of the reference coil group.

[0063] However, it is worth mentioning that the sensing range of the coil is proportional to the diameter of the coil. Therefore, in the structural design of the sensing device, the size of the reference coil group can be minimized as much as possible to improve the problem that the distance of the sensing object becomes shorter because the equivalent inductance of the reference coil group changes when the object approaches the induction coil.

[0064] In one embodiment, when the induction coil group is located close to the holster, the reference coil group is relatively far away from the holster. Therefore, if the induction area of ​​the reference coil group (reference coils 623, 625) is designed to be smaller than the induction area of ​​the induction coil group (induction coils 627, 629), the influence of the reference coil group (reference coils 623, 625) on the induction coil group (induction coils 627, 629) and the induction results can be reduced, and the inductance change caused by the metal object approaching the reference coil group can be effectively reduced.

[0065] The structural design of the sensing device can refer to Figures 7 to 10 Schematic diagram of an embodiment is shown. According to the embodiment, the greater the distance between the reference coil group and the induction coil group in the sensing device, the farther the distance between the detected object and the sensing device can be detected, and the size of the coil will limit the sensing range, and the closer the distance between the sensing device and the object to be measured is set, the more sensitive the sensing device can be to the detection of the object to be measured. Therefore, the sensing device is designed to include the reference coil group and the induction coil group in a shell, and one of the reference coil group and the induction coil group can be moved to the outside of the shell, thereby increasing the distance between the reference coil group and the induction coil group. In addition, the outer induction coil group can also be attached to the surface of an object close to the object to be measured, thereby shortening the distance to the object to be measured.

[0066] like Figure 7 The schematic diagram of an embodiment of the structure of the sensing device is shown. The sensing device includes a housing 70, which is suitable for being arranged on a side surface of an object, such as Figure 7 The housing 70 of the sensor device is shown attached to the adhesive surface 705 . The housing 70 includes a first side S1 away from the adhesive surface 705 and a second side S2 relatively adjacent to the adhesive surface 705 .

[0067] This embodiment shows that both the first induction coil group and the second induction coil group are disposed on the inner surface of the housing 70, that is, the first induction coil group, such as the reference coil group 701, is disposed on the first side S1, and the second induction coil group, such as the reference coil group 702, is disposed on the second side S2. Figure 6 In the embodiment shown, the control circuit board on the sensing device is provided with connection lines electrically connecting the first induction coil group and the second induction coil group respectively and a microcontroller (control unit).

[0068] During operation, the sensing device disposed on one side of the adhesive surface 705 is used to detect the object 700 to be detected on the other side of the adhesive surface 705. The object 700 to be detected needs to be an object that can be induced by the induction coil and cause the induction coil to change in inductance. The microcontroller in the sensing device can determine whether the object 700 to be detected exists based on the difference in physical quantity between the first induction coil group and the second induction coil group.

[0069] Taking the gun sensing system as an example, the adhesive surface 705 is like the outer surface of a holster, and the other side of the holster is a gun, that is, Figure 7 The object to be detected 700 in the holster is used to detect whether the gun is pulled out of the holster or put back into the holster. In another embodiment, a metal object (i.e. Figure 7 The sensing device adhered to the outer surface of the holster is used to detect the position of the metal object on the gun to detect whether the gun is pulled out of the holster or put back into the gun.

[0070] Figure 8 The second schematic diagram of the structural embodiment of the sensing device is shown. In order to improve the sensing distance and sensitivity, it is necessary to increase the distance between the two induction coil groups in the housing within a limited space and shorten the distance between the sensing device and the object to be measured. The structural design shown in this example can increase the distance between the first induction coil group and the second induction coil group to increase the sensing distance of the object to be measured, and shorten the distance between the induction coil group and the object to be measured to improve the sensitivity of detecting the object to be measured.

[0071] Figure 8 The shell 80 of the sensing device is shown in the figure. Similarly, a first induction coil group is provided on the first side S1, such as the reference coil group 801 in the figure, and a second induction coil group is provided on the second side S2, such as the induction coil group 802 in the figure. In particular, the second side S2 in this example is the outer surface of the shell 80, so that the second induction coil group (induction coil group 802) is provided in a receiving groove 803 on the outer surface. Structurally, the second induction coil group (induction coil group 802) can be attached to the adhesive surface 805, can be closer to the object to be measured 800 on the other side, and increase the distance between the first induction coil group (reference coil group 801).

[0072] It is worth mentioning that, relatively Figure 7 The embodiment shown, Figure 8 In the embodiment shown, the induction coil group 802 close to the object 800 is disposed on the outer surface of the housing, which is closer to the object 800 and can detect a deeper depth, that is, the object 800 can be detected more sensitively.

[0073] according to Fig. 9A The schematic diagram of the structure embodiment of the sensing device shown in the figure further shows that an opening 903 can be formed in the wall structure of the housing 90 provided with the second induction coil group (induction coil group 902) so that there is no obstruction of the wall structure between the second induction coil group (induction coil group 902) and the first induction coil group (reference coil group 901). Similarly, the second induction coil group (induction coil group 902) of the sensing device is close to the surface of the adhesive surface 905 to sense whether the object 900 to be detected exists.

[0074] Accordingly, if Fig. 9B Showing the schematic diagram of the embodiment, in terms of structure, Fig. 9B The back side schematic diagram shows that the sensing device 9 has not been attached to the holster and the second induction coil set (induction coil set 902) is not set, and the opening 903 can be exposed on the back side of the housing 90. By setting the second induction coil set (induction coil set 902) in the receiving groove of the housing 90 to cover the opening 903 of the housing 90 to close the opening 903, the second induction coil set (induction coil set 902) can be regarded as a part of the housing 90 as a part of the appearance surface.

[0075] Fig.10 Continuing to show a schematic diagram of yet another embodiment of the structure of the sensing device.

[0076] Fig.10 The first side S1 of the housing 10 of the sensing device is provided with a first induction coil group (such as the reference coil group 1001), and the second induction coil group (such as the induction coil group 1002) in the sensing device is provided on the second side S2 of the housing 10. The second side S2 in this example is the outer surface of the housing 10. In particular, in terms of structure, a positioning hole 1017 is provided on the second side S2 of the housing 10, which can be used as a sealed air extraction hole for forming the hollow cavity 1003 in the housing 10 on the machine. In this example, the sealed air extraction hole is sealed with a waterproof breathable membrane 1015, and the corresponding induction coil group 1002 also has an opening 1018 corresponding to the positioning hole 1017.

[0077] In order to provide a waterproof effect, waterproof glue 1011, 1012 and 1013 are disposed at multiple locations in the housing 10 of the sensing device. According to an embodiment, the mainboard 1100 of the sensing device can be disposed in the cavity 1003 of the housing 10. The mainboard 110 connects the reference coil group 1001 and the induction coil group 1002 with an electrical connection structure 1110. The induction coil group 1002 is structurally close to the adhesive surface 1200, so that the sensing device can effectively detect whether the object 1300 to be detected exists.

[0078] In summary, according to the above-mentioned embodiments of the sensing device, the holster sensing system and the video recording system, the sensing device includes a control unit and a sensing module, the sensing module includes a reference coil group and an induction coil group arranged in a stacked structure, and the sensing device is attached to the holster, which can be used for applications to determine the status of the gun, and can be further applied to a video recording system carried by the user. Therefore, when there is a specific emergency situation, when the user pulls the gun out of the holster, the change in inductance value can be used to determine that the gun is pulled out of the holster, so that the control unit sends a trigger signal to the video recording device, so that the video recording device starts recording.

[0079] The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention's specification and drawings are included in the scope of the present invention.

Claims

1. A sensing device, characterized in that: The sensing device comprises: a control unit; a sensing module electrically connected to the control unit, the sensing module comprising a reference coil group and an induction coil group; The sensing device is fixed on one side of an object, and the induction coil group in the sensing module is brought close to the object, and the reference coil group relatively far from the object provides a reference level; wherein the induction area of ​​the reference coil group is smaller than the induction area of ​​the induction coil group, and the control unit determines whether a metal object exists on the other side of the object based on a physical quantity difference between an induction value generated by the induction coil group and the reference level provided by the reference coil group.

2. The sensing device according to claim 1, characterized in that The reference coil group includes two coils arranged on both sides of a first substrate, and the induction coil group includes two coils arranged on both sides of a second substrate. The reference coil group and the induction coil group are arranged in a stacked structure.

3. The sensing device according to claim 2, characterized in that: The physical quantity difference is a change in inductance between the induction coil group and the reference coil group, so that the control unit determines whether the metal object exists according to an electrical signal formed by the change in inductance.

4. The sensing device according to claim 1, wherein: The device also includes a communication unit electrically connected to the control unit for transmitting a trigger signal generated by the control unit according to the physical quantity difference.

5. The sensing device according to claim 4, characterized in that: The device also includes a power supply unit which is electrically connected to the control unit and is controlled by the control unit to provide a current signal to the sensing module so that the induction coil group and the reference coil group generate an induction magnetic field.

6. The sensing device according to claim 5, characterized in that The sensing module is implemented as a proximity sensor or a differential inductor switch. Current is introduced to the two coil groups of the sensing module through the power supply unit. The reference coil group and the induction coil group form different effective sensing ranges and generate a reference inductance and an induction inductance respectively.

7. The sensing device according to claim 6, characterized in that The design that the inductive area of ​​the reference coil group is smaller than the inductive area of ​​the inductive coil group is used to reduce the inductance change caused by the metal object approaching the reference coil group.

8. The sensing device according to any one of claims 1 to 7, characterized in that: When the metal object approaches or moves away from one side of the induction coil group, the inductance of the induction coil group and the reference coil group changes, and the inductance of the induction coil group will be lower or higher than the inductance of the reference coil group, so that the sensing module receives the physical quantity difference and outputs a sensing result.

9. The sensing device according to claim 8, characterized in that The control unit performs a frequency control through a pulse width modulation to achieve frequency control and enable the sensing module to detect the inductance value generated by the induction coil group and the reference coil group.

10. A holster sensing system, characterized in that: The holster sensing system comprises: A holster for housing a firearm having a metal object that can be sensed; and a sensing device disposed on the holster, wherein the position of the sensing device corresponds to the position of the metal object when the gun is put into the holster; Wherein, the sensing device comprises: a control unit; a sensing module electrically connected to the control unit, the sensing module comprising a reference coil group and an induction coil group; a power supply unit, electrically connected to the control unit, controlled by the control unit, and thereby providing a current signal to the sensing module, so that the induction coil group and the reference coil group generate an induction magnetic field; wherein the induction area of ​​the reference coil group is smaller than the induction area of ​​the induction coil group, and the induction coil group is located close to the holster, so that the reference coil group is farther away from the holster than the induction coil group; the control unit determines whether the metal object on the gun in the holster exists according to a physical quantity difference between an induction value generated by the induction coil group and a reference level provided by the reference coil group.

11. The holster sensing system of claim 10, wherein: The reference coil group includes two coils arranged on both sides of a first substrate, and the induction coil group includes two coils arranged on both sides of a second substrate. The reference coil group and the induction coil group are arranged in a stacked structure.

12. The holster sensing system of claim 11, wherein: The physical quantity difference is a change in inductance between the induction coil group and the reference coil group, so that the control unit determines whether the metal object exists according to an electrical signal formed by the change in inductance.

13. The holster sensing system of claim 10, wherein: The sensing module is implemented as a proximity sensor or a differential inductor switch. Current is introduced to the two coil groups of the sensing module through the power supply unit. The reference coil group and the induction coil group form different effective sensing ranges and generate a reference inductance and an induction inductance respectively.

14. The holster sensing system according to any one of claims 10 to 13, characterized in that: When the metal object approaches or moves away from one side of the induction coil group, the inductance of the induction coil group and the reference coil group changes, and the inductance of the induction coil group will be lower or higher than the inductance of the reference coil group, so that the sensing module receives the physical quantity difference and outputs a sensing result.

15. The holster sensing system of claim 14, wherein: According to the sensing result, the gun is judged to be pulled out from the holster, the control unit generates a trigger signal, and when it is judged that the gun is out of the holster for a time period exceeding a threshold, the sensing device enters a power saving mode.

16. A video recording system, characterized in that: The video recording system comprises: A video recording device, comprising a communication module and a camera module; A holster for housing a firearm having a metal object that can be sensed; and A sensing device is disposed on the holster, and the position of the sensing device corresponds to the position of the metal object when the gun is put into the holster; The sensing device comprises: a control unit; a sensing module electrically connected to the control unit, the sensing module comprising a reference coil group and an induction coil group; a power supply unit, electrically connected to the control unit and controlled by the control unit, for providing a current signal to the sensing module so that the induction coil group and the reference coil group generate an induction magnetic field; The induction area of ​​the reference coil group is smaller than the induction area of ​​the induction coil group, and the induction coil group is located close to the holster, so that the reference coil group is relatively far away from the holster; the control unit determines whether the metal object on the gun in the holster exists according to a physical quantity difference between the induction coil group and the reference coil group; When the metal object approaches or moves away from one side of the induction coil group, the inductance of the induction coil group will be lower or higher than the inductance value of the reference coil group. The difference in physical quantity is received by the sensing module and a sensing result is output. When the sensing result shows that the gun is pulled out of the holster, the control unit sends a trigger signal to the communication module of the video recording device through the communication unit to activate the camera module to start recording.

17. The video recording system according to claim 16, wherein: The physical quantity difference is a change in inductance between the induction coil group and the reference coil group, so that the control unit determines whether the metal object exists according to an electrical signal formed by the change in inductance.

18. The video recording system according to claim 16, wherein: The sensing module of the sensing device is implemented as a proximity sensor or a differential inductor switch. Current is introduced into the two coil groups of the sensing module through the power supply unit. The reference coil group and the induction coil group respectively form different effective sensing ranges and generate a reference inductance and an induction inductance respectively.

19. The video recording system according to claim 16, wherein: The reference coil group in the sensing module includes two coils arranged on both sides of a first substrate, and the induction coil group includes two coils arranged on both sides of a second substrate. The reference coil group and the induction coil group are arranged in a stacked structure.

20. The video recording system according to any one of claims 16 to 19, characterized in that: When the sensing module receives the physical quantity difference, it outputs the sensing result; once it is determined according to the sensing result that the gun is pulled out of the holster, the control unit sends the trigger signal to start the video recording device, and when it is determined that the gun is out of the holster for a time period exceeding a threshold, the sensing device enters a power saving mode.

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