JP7383452B2 - Self-fire alarm system - Google Patents

Description

The present invention is effective when applied to a fire alarm system equipped with a fire receiver that receives a detection signal from a fire detector, displays the situation, and controls the operation of related devices, and a camera that takes pictures of the area being monitored. Regarding technology.

Generally, buildings, etc. are equipped with a self-fire alarm system equipped with a fire detector (smoke detector), and as a device that plays a central role in the self-fire alarm system, it is used to detect the occurrence of fire in the entire fire monitoring target. A general control panel is installed in the fire monitoring room (disaster prevention center) to understand the situation of fires, expansion, etc., and to issue commands to firefighting equipment. This general operation panel is provided with a fire receiver for displaying the situation within the fire area and giving various instructions in response to signals from fire detectors and the like.

Self-fire alarm systems include a P-type system that sends a signal from a fire detector to a P-type receiver in each warning area via a common line and an individual detector line to notify of a fire, and a P-type system that sends a signal from a fire detector to a P-type receiver to notify the fire. There is an R-type system that sends fire signals converted into signals to a common detector line and sends them to an R-type receiver to notify the occurrence of a fire.
In both systems, when the receiver first receives a signal from a fire detector, it does not immediately determine that a fire has occurred and issues an alarm. After the primary detection (preliminary detection), a signal from the sensor is received again within a predetermined time and a fire alarm is issued. Once a fire alarm is issued, even if the alarm is a false alarm due to noise or the like, it is necessary to correct automatic notifications to outsiders and evacuation guidance instructions, causing confusion. Therefore, during the accumulation time or before the main alarm after preliminary detection, the situation around the sensor that issued the fire detection signal is checked to confirm whether there is a fire or not.

Conventionally, as an invention related to a system for supporting confirmation work to confirm whether it is a fire alarm or a non-fire alarm, which is carried out during the storage time or after preliminary detection and before the main alarm, for example, a receiver sends a signal when it has determined that a detector has detected an abnormality. The support device that receives the abnormal signal selects a mobile terminal and requests the mobile terminal to display a confirmation screen, and depending on the response from the mobile terminal to the confirmation screen, switches to a main alert or not. A system has been proposed in which an instruction is given as to whether to stop (see Patent Document 1).
Further, in a fire alarm system in which a plurality of fire detectors and a fire receiver are connected via a signal line, a plurality of camera terminals are connected to the fire receiver via the signal line, and the fire receiver It describes an invention relating to fire alarm equipment that monitors and controls a plurality of fire detectors and a plurality of camera terminals to collect and display status information of each fire detector and image information of each camera terminal ( (See Patent Document 2).

Japanese Patent Application Publication No. 2016-173854 Japanese Patent Application Publication No. 2013-101586 Japanese Patent Application Publication No. 07-182579

According to the invention of Patent Document 1, when a primary alarm is issued, information is transmitted from a mobile terminal owned by disaster prevention personnel to a support device, and based on the information received by the support device, it is possible to accurately determine whether there is a fire or not. can be judged.
However, in the support system of the invention disclosed in Patent Document 1, disaster prevention personnel must rush to the area where the primary alarm is located, and must also operate a mobile terminal. If the distance between disaster prevention personnel and the area where the sensor is located is long, the confirmation process may not be able to be completed during the accumulation time or after preliminary detection and before the main warning.

Furthermore, according to the invention disclosed in Patent Document 2, detection information from a fire detector and image information from a camera can be collected and displayed by a receiver, so when a primary alarm is issued, it is possible to determine whether it is a fire alarm or non-fire alarm. It is possible to quickly determine whether there is a fire alarm. Further, Patent Document 2 discloses that detection information from a fire detector and image information from a camera are transmitted via a common signal line, and a signal that transmits the information of the detector and the information of the camera is disclosed. Since there is no need to install separate lines, it is effective when installing new fire alarm equipment in an area (building or facility) that you want to monitor.

However, in fire alarm equipment, multiple detectors are connected to lines installed in each monitoring area, and each line is supplied with current from the receiver according to the number of connected sensors. It is generally configured. Therefore, if you install a new camera in a monitoring area where fire alarm equipment is already installed, connect the camera to the line to which the detector is connected, and try to operate the camera using power from the line, each There is a risk of exceeding the allowable power of the line. Further, although the receiver is required to have a function of receiving and displaying image information, some existing receivers do not have such a function.

Therefore, in order to apply the invention of Patent Document 2 to existing fire alarm equipment, it is necessary to install a new signal line with a large power supply capacity, or to change the existing receiver to a function that extracts image information from the received signal. It is necessary to replace the receiver with a receiver that has the function of displaying images, which poses a problem of significantly increasing costs.
In addition, Patent Document 3 discloses that an imaging device (camera) is built into the main body case together with a heat and smoke detection section, and when the sensor generates an alarm, the imaging device is activated to start photographing, and the photographed images are used for disaster prevention purposes. An invention relating to a sensor capable of transmitting data to a center is described. However, Cited Document 3 does not describe anything about how to feed power to the sensor or camera or how to specifically transmit image information.

The present invention was made against the above background, and its purpose is to detect a fire based on image information around the sensor that detected the fire during the accumulation time or before the main alarm after preliminary detection. An object of the present invention is to provide a self-fire alarm system that can quickly determine whether a fire is occurring or not.
Another object of the present invention is to connect the sensor line without increasing the power supply capacity of the sensor line to which the sensor is connected, or without making modifications such as increasing the power supply capacity of the receiver to the sensor line. An object of the present invention is to provide a self-fire alarm system that can acquire image information around a sensor that detects a fire by supplying power to a camera through the camera.

In order to solve the above problems, the present invention
A plurality of sensors installed in a monitoring area, a receiver connected to the plurality of sensors via a sensor line, and a receiver connected to the sensor line and corresponding to one or more sensors. an imaging device attached, the receiver configured to supply power to a sensor connected to the sensor line via the sensor line and the imaging device. A system,
The sensor is configured to, when detecting an abnormality, notify the receiver of the detection of the abnormality via the sensor line and send an imaging start signal to the corresponding imaging device,
The imaging device includes an imaging section, a control section that can control the operation of the imaging section, a power supply section that is connected to the sensor line and generates an operating voltage for the imaging section and the control section, and the imaging section. and an information transmitting section that transmits information about the photographed image,
The control unit is configured to stop the imaging operation of the imaging unit in a normal state, and upon receiving the imaging start signal, cause the imaging unit to execute the imaging operation, and cause the information transmission unit to transmit information on the captured image. This is what I did.

According to the above means, since power is supplied to the imaging device via the power supply sensor line to which the sensor is connected, the cost is reduced compared to the case where the power supply sensor line is provided separately for the sensor and the image capture device. can do. In addition, since the imaging device is operated only when an abnormality is detected by the imaging start signal generated when the sensor detects an abnormality, the power supplied by the power supply sensor line to which the sensor is connected is suppressed. be able to. In addition, since it is equipped with an information transmitting unit that transmits information on images taken by the imaging unit, the transmitted image information can be received and displayed on a terminal device, etc. at the disaster prevention center, and it can be determined whether it is a fire alarm or a non-fire alarm. Not only can a judgment be made quickly, but also the cause of the abnormality can be accurately determined by understanding the situation around the sensor when the sensor detects an abnormality.

Here, desirably, the imaging device includes a storage unit that stores its own device identification information, and has a ratio of 1:N (N is a positive integer) to each of the sensors connected to the sensor line. It was established in relation to
The number of sensors and the value of N are set so as not to exceed an allowable current that can be supplied from the receiver to the sensor line,
The control section is configured to cause the information transmission section to transmit image information photographed by the imaging section and own device identification information stored in the storage section.

According to such a configuration, when the current consumption of the imaging device is larger than the current consumption of the sensor, the power supply ability of the receiver to the sensor line to which the sensor is connected can be increased without reducing the number of sensors. The imaging device can be installed within the range of Additionally, even if multiple sensors are connected to one sensor line and it is unclear which sensor detected an abnormality, an abnormality will occur based on the device identification information of the imaging device that sent the image information. You can understand the area.

Preferably, the power supply section includes a current limiting resistor and a capacitor in series, and the imaging section is configured to perform a shooting operation using energy stored in the capacitor.
According to this configuration, since the operating current of the imaging device can be limited, it is possible to suppress voltage fluctuations when power is supplied to the capacitor due to the operation of the imaging device of the sensor line to which the imaging device is connected. This can prevent erroneous judgments by the receiver due to voltage fluctuations.

Furthermore, desirably, the power supply section includes a voltage regulator connected to the sensor line and converting the voltage supplied from the receiver,
the capacitor is charged by the output voltage of the voltage regulator;
The control section is configured to control the output voltage of the voltage regulator.
According to this configuration, the imaging device can be charged with a desired output voltage, and the degree of freedom in circuit design can be increased.

Preferably, the control section is configured to cause the imaging section to perform a photographing operation of photographing one or more still images upon receiving the imaging start signal from a corresponding sensor.
According to this configuration, the power consumption of the imaging device can be reduced compared to the case where the imaging device shoots a moving image and transmits the moving image. In addition, in general, a smaller number of still images than videos can allocate more information per image, so clearer image information can be obtained, and abnormalities can be detected based on the transmitted image. The cause of the occurrence can be determined more accurately.

Further, preferably, the receiver is a P-type receiver with a storage function,
The sensor is configured to send an imaging start signal to the corresponding imaging device each time it detects an abnormality,
The control section of the imaging device is configured to cause the imaging section to perform a photographing operation when a corresponding sensor first detects an abnormality and when an abnormality is detected during an accumulation time.
According to this configuration, in the P-type self-fire alarm system, the vicinity of the sensor that detects the abnormality can be photographed both when the abnormality is detected for the first time and when the abnormality is detected during the accumulation time without modifying the existing system. It is possible to accurately determine the cause of the abnormality, the rate of fire spread, etc.

Preferably, the receiver is an R-type receiver having a primary alarm function and a main alarm function, and the sensor sends an imaging start signal to the corresponding imaging device when issuing the primary alarm. configured to send,
The control section of the imaging device is configured to cause the imaging section to perform a photographing operation when a corresponding sensor issues a primary alarm.
According to this configuration, in the R-type self-fire alarm system, it is possible to obtain an image of the vicinity of the sensor that detected the abnormality when issuing the primary alarm without modifying the existing system, so the cause of the abnormality and the cause of the abnormality can be determined. It is possible to accurately judge whether it is a fire alarm or a non-fire alarm.

Furthermore, desirably, the sensor is configured to send an imaging start signal to the corresponding imaging device at the time of the primary alarm and the main alarm,
The control section of the imaging device is configured to cause the imaging section to perform a photographing operation when a corresponding sensor issues a primary alarm and when a main alarm is issued, respectively.
According to this configuration, in the R-type self-fire alarm system, it is possible to obtain images of the vicinity of the sensor that detected an abnormality when issuing the primary alarm and when issuing the main alarm, so that the cause of the abnormality and the spread of the fire can be determined. It is possible to accurately judge speed, etc.

Further, desirably, the information transmitting unit includes wireless communication means,
The control unit is configured to transmit image information to a predetermined mobile terminal in time series via a public wireless communication network using the wireless communication means after the imaging unit executes a photographing operation.
According to this configuration, when applying to an existing self-fire alarm system to transmit captured images by wireless communication, it is possible to transmit an image captured in the vicinity of a sensor that has detected an abnormality without modifying the system. can. In addition, images taken when the detector detects an abnormality can be acquired in chronological order, so by analyzing the accumulated images, it is possible to accurately determine the cause of the fire and the rate of fire spread. can.

According to the self-fire alarm system of the present invention, it is possible to quickly determine whether it is a fire alarm or a non-fire alarm based on the image information around the sensor that detected the fire during the accumulation time or after preliminary detection and before the main alarm. can. In addition, power can be supplied to the camera via the sensor line without increasing the power supply capacity of the sensor line to which the sensor is connected or making modifications such as increasing the power supply capacity of the receiver to the sensor line. This has the effect of making it possible to obtain image information near the sensor that detected the fire.

1 is a system configuration diagram showing an embodiment of a self-fire alarm system according to the present invention. FIG. 2 is a block diagram showing an example of an imaging device constituting the fire alarm system of FIG. 1. FIG. FIG. 2 is a block diagram showing a configuration example of a smoke detector that constitutes the self-fire alarm system of FIG. 1. FIG. It is a flowchart which shows an example of the photography processing procedure of the imaging device in the fire alarm system of an embodiment. FIG. 3 is a block diagram illustrating an example of a power supply section built into the imaging device of FIG. 2. FIG.

Hereinafter, a self-fire alarm system according to the present invention will be explained with reference to the drawings.
FIG. 1 shows a schematic configuration of an embodiment of a self-fire alarm system according to the present invention.
As shown in FIG. 1, the self-fire alarm system of this embodiment monitors occurrences of fires, gas leaks, etc. in monitoring areas set for one building or multiple buildings, and detects abnormalities such as fire alarms. It provides notification and receives detection signals from a plurality of sensors 12 distributed within the monitoring area and from each sensor 12 via a sensor line 11 consisting of a line line L and a common line C. A fire receiver 13, a plurality of imaging devices 14 connected to the detector line 11, and a smartphone that receives image information wirelessly transmitted from the imaging devices 14 via a wireless repeater 15 such as an IoT gateway. It is composed of a mobile terminal 16 such as the above.

The fire receiver 13 controls the entire self-fire alarm system, and has the function of receiving signals from the detector 12 via the sensor line 11 to determine the occurrence of a fire or gas leak, the area where the fire has occurred, etc. When a fire or gas leak is detected in response to a detection signal from the sensor 12, the system emits an alarm, controls fire doors, dampers, etc., and rings the district bell.
Although not shown, a plurality of sensor lines 11 are connected to the fire receiver 13. Further, a repeater may be provided in the middle of the sensor line 11 that transmits the detection signal from the sensor 12. Further, in addition to the sensor 12, the sensor line 11 may be connected to smoke prevention devices such as fire doors and dampers, alarm devices such as bells and speakers installed in each district, and the like. The sensor 12 includes a smoke detector, a gas leak detector, and the like.

The fire receiver 13 applies a DC voltage such as 28V to the line L of the detector line 11, and applies a ground potential (0V) to the common line C of the detector line 11, so that the detector 12 detects the fire. It is configured to operate using power supplied from the receiver 13 to the sensor line 11.
In FIG. 1, assuming a facility where one sensor is installed in one room, such as a group home, the sensor 12 and the imaging device 14 are installed in a 1:1 relationship. When the sensor 12 detects a fire or the like, the sensor 12 sends an activation trigger signal to the imaging device 14 to start photographing. When the imaging device 14 operates and transmits image information photographed, it is configured to transmit the device ID (identification information) together with the image information. Further, in the mobile terminal (smartphone) 16 or the fire receiver 13, the device ID of each imaging device 14 and the device ID of the corresponding sensor 12 are stored in advance in association with each other and the installation position information.

As described above, by installing the sensor 12 and the imaging device 14 in a 1:1 relationship and storing the device ID in a linked manner, even in the P-type fire alarm system, the sensor that detects a fire can It becomes possible to specify the location of In the case of the R-type self-fire alarm system, the sensor 12 has a function of transmitting its own ID and detection information, and the line L and common line C of the sensor line 11 function as a power supply line and a transmission line.
Although not shown, in facilities such as schools and event venues where multiple sensors are installed in one space (room), or in long hallways, multiple sensors 12 may be installed. Alternatively, one imaging device 14 may be installed, and a plurality of sensors 12 may each send an activation trigger signal to start imaging to one imaging device 14.

In addition, there is an upper limit to the power supply capacity from the fire receiver 13 to the detector line 11, and there is a difference in current consumption between the detector 12 and the imaging device (camera) 14, so the power supply capacity of the fire receiver 13 and The number of sensors 12 and imaging devices 14 connected to one sensor line 11 is determined according to the current consumption of the device.
Specifically, the current that can be supplied from the fire receiver 13 to the detector line 11 is 600 mA, and the current consumption of the detector 12 is 60 mA. Usually, 10 detectors 12 are connected to one detector line 11. If the current consumption of the camera is 180 mA when connected, then 7 sensors and 1 camera are connected to the sensor line 11, or 4 sensors and 2 cameras are connected to the sensor line 11. I'll do what I do. As a result, even if devices connected to one detector line 11 operate at the same time, a current exceeding the power supply capacity of the fire receiver 13 flows through the detector line 11 and the voltage decreases, causing a voltage drop in the fire receiver 13. can prevent them from making wrong decisions.

Note that some existing detectors are equipped with a terminal (P terminal) for outputting a detection signal to the outside when a fire is detected. When this embodiment is applied to an information system, it is possible to use the output signal of the P terminal of the sensor as the activation trigger signal for starting photographing of the imaging device (camera) 14.
Furthermore, when this embodiment is applied to an existing fire alarm system, there may not be enough current in the sensor line. Even in such a case, as will be described later, by incorporating a power supply having a power storage function into the imaging device 14, it becomes possible to additionally install a camera that photographs the area around the sensor.

Examples of communication methods for image information from the imaging device 14 to the wireless repeater 15 in the system of FIG. 1 include wireless LAN such as WiFi according to the IEEE 802.11 standard, Bluetooth (registered trademark) communication, infrared communication, visible light communication, etc. A known communication method can be used. Furthermore, the mobile terminal 16 is a device equipped with a wireless communication function such as a smart phone or a tablet terminal owned by an administrator waiting at the disaster prevention center, and in this embodiment, the mobile terminal 16 is a device equipped with a wireless communication function such as a smartphone or a tablet terminal, which is owned by an administrator waiting at the disaster prevention center. Image information is received from the wireless repeater 15 via a wireless communication network that enables communication in accordance with wireless communication standards such as . The wireless repeater 15 is configured to have, for example, a conversion function between WiFi and LTE.

FIG. 2 shows a configuration example of the imaging device 14 that constitutes the self-fire alarm system according to the present invention.
As shown in FIG. 2, the imaging device 14 according to the present embodiment includes a power supply section 41 that is connected to the line line L and the common line C of the sensor line 11 and generates the voltage necessary for the operation of the circuits and devices inside the device; A microcomputer (control unit) 42 that controls the operation of circuits and devices inside the device, a camera (imaging unit) 43 that can take continuous still images, and a memory (ID registration) that stores the device ID assigned to the imaging device 14. part) 44, a starting trigger signal input part 45 consisting of terminals P, C that receives the input of the starting trigger signal to start shooting from the sensor 12, a buffer circuit, etc., and transmitting the image information and device ID taken by the camera 43 to the outside. It is composed of a wireless communication section (WiFi communication module) 46 and the like that performs communication and receives commands and the like from the outside.

The microcomputer 42 normally cuts off the voltage from the power supply section 41 to the camera 43 and the wireless communication section 46 to be in a non-operating state (sleep mode), and when a start trigger signal to start photographing is input to the terminal P, The camera 43 and the wireless communication unit 46 are allowed to be supplied with voltage and put into operation. Thereby, the current consumption of the imaging device 14 during normal operation can be reduced. Further, the microcomputer 42 itself may have a sleep mode and may be configured to operate with low current consumption until a start trigger signal to start photographing is input. The ID registration section (44) may be a nonvolatile memory such as an EPROM built into the microcomputer 42.

Note that if the microcomputer 42 includes a general-purpose I/O port, the activation trigger signal input section 45 may be omitted. In addition, when the power supply section 41 has a configuration having a power storage function (capacitor) as described later, a voltage detection circuit that detects the charging voltage of the power supply section 41 is provided to detect that the voltage is equal to or higher than a predetermined voltage after the start of power storage. It may be configured to stop charging the capacitor upon detection, and restart charging when the voltage drops below a predetermined value.
Further, the imaging device 14 is provided with a lighting device (LED lamp) and an illuminance sensor so that when the surrounding illuminance is low (dark), the lighting device can be turned on when operating the imaging device 14. It may be configured.

FIG. 3 shows a configuration example of a smoke detector as an example of the sensor 12 that constitutes the self-fire alarm system according to the present invention.
As shown in FIG. 3, the sensor 12 in this embodiment includes a light emitting element 21, a light receiving element 22, an amplifier 23 that amplifies the signal from the light receiving element 22, and a signal (analog signal) amplified by the amplifier 23. The apparatus includes an AD conversion circuit 24 that converts the signal into a digital signal, and a fire determination circuit 25 that determines whether a fire has occurred based on the output value from the AD conversion circuit 24.
The fire determination circuit 25 can be configured by a microprocessor (CPU) and storage means such as ROM (read only memory) and RAM (random access memory).

The smoke detector 12 also includes a pair of external terminals (line terminal and common terminal) 26a and 26b, which are respectively connected to the line line L and common line C of the sensor line 11 installed in the facility. A power supply circuit 27 is provided which generates a power supply voltage (3V or 6V) used inside the sensor from the voltage (10V to 32V) applied to the line line L and the common line C and supplies it to each internal circuit. Further, when the fire detection circuit 25 detects the occurrence of a fire, the smoke detector 12 reduces the impedance between the line line L and the common line C (including short circuit) to prevent the occurrence of a fire as shown in FIG. A short circuit (impedance switching means) 28 consisting of a switch for notifying the receiver 13 is connected to a terminal P for outputting a trigger signal for starting imaging to the imaging device 14, and is output to the outside via this terminal. A signal output circuit 29 is provided that generates and outputs an activation trigger signal for starting imaging.

The detectors that make up the P-type self-fire alarm system cannot distinguish between the first fire detection and the fire detection after the accumulation time has elapsed, so a trigger signal to start shooting is generated every time a fire is detected. Output to the imaging device 14. On the other hand, the sensors that make up the R-type self-fire alarm system can distinguish between preliminary detection (primary detection) and main alarm, so they generate a trigger signal to start shooting only in the case of preliminary detection, and take images. It may be outputted to the imaging device 14, or a starting trigger signal for starting imaging may be generated based on both the preliminary detection and the main alarm and outputted to the imaging device 14.

Next, an example of a specific procedure for photographing processing when the power supply section 41 of the imaging device 14 has a power storage function will be described using the flowchart of FIG. 4.
When the process of FIG. 4 starts, the microcomputer 42 of the imaging device 14 determines whether or not charging of the capacitor C1 is completed (step S1). Here, if it is determined that charging of the capacitor C1 is completed (YES), the process proceeds to step S2, and it is determined whether or not a starting trigger signal to start photographing has been received from the corresponding sensor (trigger signal on). If it is determined that the activation trigger signal has been received (YES), the process proceeds to step S3, and the camera 43 is activated to start photographing.

Subsequently, the microcomputer 42 determines whether a predetermined photographing time has elapsed (step S4). Here, the predetermined photographing time is the time required to photograph a preset number of still images. If it is determined in step S4 that the predetermined photographing time has elapsed (YES), the process proceeds to step S6. On the other hand, if it is determined in step S2 that the activation trigger signal to start photographing has not been received (trigger signal OFF), the process proceeds to step S5, and it is determined whether or not the NG flag is set (ON). If it is determined that the NG flag is not set (NO), the process returns to step S2, and if it is determined that the NG flag is set (ON) (YES), the process proceeds to step S6.

In step S6, the power switch of the camera 43 is turned off and the process proceeds to step S7, where wireless communication is started to transmit information on the captured image to a predetermined mobile terminal via the gateway. At this time, the photographing time information may be transmitted together with the image information.
Subsequently, the microcomputer 42 determines whether or not the transmission of the image information has been completed (step S8), and when determining that the transmission has been completed (YES), the microcomputer 42 proceeds to step S9 and clears (OFF) the NG flag. Return to step S1.

If it is determined in step S4 that the predetermined photographing time has not elapsed (NO), the process moves to step S10, in which it is determined whether the charging voltage of capacitor C1 is equal to or higher than a predetermined value, and the charging voltage of capacitor C1 is determined to be a predetermined value. If it is determined that the above is the case (YES), the process returns to step S4 and the process is repeated until the predetermined photographing time has elapsed.
If it is determined in step S10 that the charging voltage of the capacitor C1 is not equal to or higher than the predetermined value (NO), the process proceeds to step S11 to turn off the power of the camera 43, and then turns on the NG flag in step S12 and returns to step S1.

On the other hand, if it is determined in step S8 that the transmission is not completed (NO), the process moves to step S13, where it is determined whether the charging voltage of capacitor C1 is equal to or higher than a predetermined value, and the charging voltage of capacitor C1 is set to a predetermined value. If it is determined that the charging voltage of the capacitor C1 is not higher than the predetermined value (NO), the process goes to step S14, where the NG flag is turned off and the process returns to step S1.
The image information transmitted from the imaging device 14 as described above is received by a mobile terminal held by a manager or the like who is waiting at the disaster prevention center, and is stored as time-series data along with the photographing order or photographing time information. is accumulated in By analyzing the accumulated time-series image information, it becomes possible to accurately determine the cause of the fire alarm and the rate of fire spread.

Next, a specific example of the power supply unit 41 built into the imaging device 14 will be described using FIG. 5.
As shown in FIG. 5A, the power supply unit 41 in the imaging device 14 of this embodiment is connected to the line L and common line C of the sensor line 11, and supplies the voltage (for example, 28 V) of the line L to the microcomputer. 42 is provided with voltage conversion means consisting of a three-terminal regulator REG such as a series regulator that converts (steps down) the voltage (for example, 5V) necessary for the operation of 42.
Further, the power supply section 41 includes a power storage means consisting of a capacitor C1 and a current limiting resistor R1 connected in series between the voltage output terminal OUT of the regulator REG and the common line C. It is configured to operate based on the voltage charged to C1. Capacitor C1 can be constructed using a supercapacitor with a capacitance value such as 5F.

As described above, by providing the current limiting resistor R1 and appropriately setting its resistance value, when the operating current or charging current flows through the imaging device 14, a current exceeding a predetermined current value does not flow. It is possible to restrict a current exceeding the permissible current or power supply capability from flowing through the sensor line 11. That is, even if the imaging device 14 operates, a large current is prevented from suddenly flowing through the sensor line 11. Therefore, it is possible to prevent the fire receiver 13 from erroneously detecting fire due to large fluctuations in the potential of the sensor line 11.

Furthermore, since the camera 43 is configured to operate using the voltage charged in the capacitor C1, when the camera 43, which consumes a larger current than the sensor 12, performs a photographing operation, the current supplied from the regulator REG is reduced. You can avoid running out.
Furthermore, in this embodiment, instead of taking a moving image with the camera 43, one or more still images are taken at predetermined time intervals to prevent current from constantly flowing through the camera 43. The amount of power consumed in C1 is reduced. Therefore, it is not necessary to use a capacitor with a large capacitance value as the capacitor C1, so that it is possible to suppress an increase in cost and the size of the device.

Note that the connection order of the capacitor C1 and the current limiting resistor R1 may be reversed to that in FIG. 5A, that is, the current limiting resistor R1 may be connected between the output terminal OUT of the regulator REG and the capacitor C1. Further, as shown in FIG. 5B, the circuits (control unit, ID registration unit, information transmission unit) other than the camera 43 in the imaging device 14 are operated by supplying a voltage such as 5V generated by the regulator REG. The camera 43 is operated by supplying a voltage higher than 5V charged to a power storage unit consisting of a current limiting resistor R1 and a capacitor C1 connected in series between the line line L and the common line C. It may be configured as follows.

Further, a means for detecting the charging voltage of the capacitor C1 is provided, and when the charging voltage becomes high, the microcomputer 42 stops the charging operation by the regulator REG, thereby reducing power consumption. It's okay.
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified as appropriate. For example, in the above embodiment, the imaging device 14 is configured as a separate unit from the sensor 12, but the imaging device 14 may be built into the housing of the sensor 12 and configured as an integrated device. .

Further, in the embodiment described above, the sensor 12 is provided with a terminal that outputs the activation trigger signal for starting imaging to the imaging device 14, but some sensors are equipped with a lamp for notifying the operating state. In such a sensor, a starting trigger signal is placed on the light of the lamp for operation status notification and the image is emitted, and the imaging device is equipped with a light receiving element and extracting the starting trigger signal included in the light from the lamp from the signal of the light receiving element. It is also possible to provide a circuit to start photographing in response to an activation trigger based on an optical signal.

11 Sensor line (power supply line)
12 Detector (smoke detector)
13 Fire receiver (receiver)
14 Imaging device 15 Wireless repeater 16 Mobile terminal 21 Light emitting element 22 Light receiving element 23 Amplifier 24 AD conversion circuit 25 Fire judgment circuit 26a External terminal (line terminal)
26b External terminal (common terminal)
27 Power supply circuit 28 Short circuit 29 Signal output circuit 41 Power supply section 42 Microcomputer (control section)
43 Camera (imaging section)
45 Trigger signal input section 46 Wireless communication section

Claims (9)

A plurality of sensors installed in a monitoring area, a receiver connected to the plurality of sensors via a sensor line, and a receiver connected to the sensor line and corresponding to one or more sensors. an imaging device attached, the receiver configured to supply power to a sensor connected to the sensor line via the sensor line and the imaging device. A system,
The sensor is configured to, when detecting an abnormality, notify the receiver of the detection of the abnormality via the sensor line and send an imaging start signal to the corresponding imaging device,
The imaging device includes an imaging section, a control section that can control the operation of the imaging section, a power supply section that is connected to the sensor line and generates an operating voltage for the imaging section and the control section, and the imaging section. and an information transmitting section that transmits information about the photographed image,
The control unit is configured to stop the imaging operation of the imaging unit in a normal state, and upon receiving the imaging start signal, cause the imaging unit to execute the imaging operation, and cause the information transmission unit to transmit information on the captured image. A self-fire alarm system characterized by: The imaging device includes a storage unit that stores its own device identification information, and is installed in a relationship of 1:N (N is a positive integer) with respect to the sensors respectively connected to the sensor line,
The number of sensors and the value of N are set so as not to exceed an allowable current that can be supplied from the receiver to the sensor line,
1 . The control unit is configured to cause the information transmission unit to transmit image information photographed by the imaging unit and own device identification information stored in the storage unit. The self-fire alarm system described in . 3. The power source unit includes a current limiting resistor and a capacitor in series, and the imaging unit is configured to perform a photographing operation using energy stored in the capacitor. self-fire alarm system. The power supply section includes a voltage regulator connected to the sensor line and converting the voltage supplied from the receiver,
the capacitor is charged by the output voltage of the voltage regulator;
The self-fire alarm system according to claim 3, wherein the control unit is configured to control the output voltage of the voltage regulator. The control unit is configured to cause the imaging unit to perform a photographing operation of photographing one or more still images upon receiving the imaging start signal from a corresponding sensor. The self-fire alarm system according to any one of 1 to 4. The receiver is a P-type receiver with a storage function,
The sensor is configured to send an imaging start signal to the corresponding imaging device each time it detects an abnormality,
The control unit of the imaging device is configured to cause the imaging unit to perform a shooting operation when a corresponding sensor first detects an abnormality and when an abnormality is detected during an accumulation time. The self-fire alarm system according to any one of claims 1 to 5, characterized by: The receiver is an R-type receiver equipped with a primary alarm function and a main alarm function,
The sensor is configured to send an imaging start signal to the corresponding imaging device when issuing a primary alarm,
According to any one of claims 1 to 5, the control unit of the imaging device is configured to cause the imaging unit to perform a photographing operation when a corresponding sensor issues a primary alarm. Self-fire alarm system as described. The sensor is configured to send an imaging start signal to the corresponding imaging device at the time of the primary alarm and the main alarm,
The control unit of the imaging device is configured to cause the imaging unit to perform a photographing operation when a corresponding sensor issues a primary alarm and when a main alarm is issued, respectively. The self-fire alarm system described in 7. The information transmitting unit includes wireless communication means,
The control unit is configured to transmit image information to a predetermined mobile terminal in chronological order via a public wireless communication network by the wireless communication means after the imaging unit executes a photographing operation. The self-fire alarm system according to any one of claims 1 to 8, characterized by:

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