JP2015148997A - Security system, sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a security system capable of preventing a use from failing to replace a battery, and a sensor used therefor.SOLUTION: A window sensor 1 detects an open/close state and a lock/unlock state of a window 4 using a battery 11 as a power source and transmits a detection result via a radio signal. The window sensor 1 includes: a transmission section 12; a voltage monitoring section 13; a determination section 143; and a first alarm section 17. When the output voltage from the battery 11 lowers below a first threshold value, the determination section 143 outputs a first determination result; and when the output voltage from the battery 11 lowers below a second threshold value, the determination section 143 outputs a second determination result. When the output voltage from the battery 11 lowers below the second threshold value, the first alarm section 17 outputs a preliminary alarm; when the output voltage from the battery 11 lowers below the first threshold value, the first alarm section 17 outputs a main alarm.

Description

  The present invention relates to a security system for building security and a sensor used therefor.

  Conventionally, a sensor for detecting an open / closed state and an unlocked state of a window has been provided (see, for example, Patent Document 1). The sensor described in Patent Literature 1 detects the open / closed state and the unlocked / unlocked state of the window, and transmits the detection result to the parent device by a radio signal. This type of sensor uses a battery as a power source because of restrictions on attachment locations and convenience of attachment.

JP2013-44217A

  This type of sensor cannot ensure security when the battery is exhausted and wireless signal transmission is disabled. Therefore, it is necessary to monitor the output voltage of the battery, output an alarm before wireless signal transmission is disabled, and prompt the user to replace the battery. However, if an alarm is output before it becomes inoperable, it will operate normally for some time after the alarm is output, so the battery may be forgotten and the sensor may become inoperable without notice .

  This invention is made | formed in view of the said reason, The objective is to provide the security system which can prevent forgetting replacement | exchange of a battery, and the sensor used for this.

  The security system according to the present invention includes a parent that includes a battery as a power source, a sensor that detects a detection target state and transmits a detection result as a wireless signal, and a notification unit that receives the wireless signal and notifies the detection target state. And a sensor that monitors the output voltage of the battery, a first threshold value based on an operating lower limit voltage of the transmitter, and the first threshold A second threshold value that is larger than the threshold value by a predetermined value is set, and a voltage monitoring unit that compares the output voltage of the battery with the first threshold value and the second threshold value; and the output voltage of the battery is the first voltage value A determination unit that outputs a first determination result when the voltage falls below a threshold value and outputs a second determination result when an output voltage of the battery falls below the second threshold value; With a first alarm section to notify The first alarm unit outputs a preliminary alarm when the determination unit outputs the second determination result, and outputs a main alarm when the determination unit outputs the first determination result. To do.

  In this security system, the sensor is preferably a window sensor that detects at least one of an open / closed state and a locked / unlocked state of the window.

  In this security system, it is preferable that the transmission unit stops transmitting the radio signal when the determination unit outputs the first determination result.

  In this security system, the determination unit notifies the base unit of the second determination result to the base unit in addition to the first alarm unit via the transmission unit, and the base unit transmits the second determination unit. It is preferable to provide a second alarm unit that receives the result and outputs an alarm corresponding to the preliminary alarm.

  In this security system, when the transmission unit is operable during the output of the main alarm, the determination unit transmits the first determination result to the base unit in addition to the first alarm unit. Preferably, the master unit includes a second alarm unit that receives the first determination result and outputs an alarm corresponding to the main alarm.

  The sensor of the present invention is used in the above security system.

  As described above, according to the present invention, a preliminary alarm is output before wireless signal transmission becomes impossible due to battery exhaustion, and this alarm is output when the battery runs out. There is an effect that can be done.

It is a block block diagram of the sensor of an embodiment. It is a schematic structure figure of a security system of an embodiment. It is a schematic block diagram of the sensor of an embodiment. (A)-(c) is a figure which shows the output voltage of a battery.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
The security system of this embodiment includes a window sensor 1 (sensor) and a parent device 2 (see FIG. 2). The window sensor 1 uses the battery 11 as a power source, detects the open / closed state of the window 4, and the unlocked / unlocked state (detection target state), and transmits the detection result by a radio signal. The base unit 2 includes a monitor 21 (notification unit) that receives a radio signal and notifies the opening / closing state and the unlocking / unlocking state of the window 4. Moreover, the window sensor 1 is provided with the transmission part 12, the voltage monitoring part 13, the judgment part 143, and the 1st alarm part 17 (refer FIG. 1). The transmission unit 12 transmits a radio signal. The voltage monitoring unit 13 monitors the output voltage of the battery 11, and a first threshold value based on the operation lower limit voltage of the transmission unit 12 and a second threshold value that is larger than the first threshold value by a predetermined value are set. The output voltage of the battery 11 is compared with the first threshold value and the second threshold value. The determination unit 143 outputs the first determination result when the output voltage of the battery 11 is lower than the first threshold, and outputs the second determination result when the output voltage of the battery 11 is lower than the second threshold. Output. The first alarm unit 17 notifies information related to the life of the battery 11. The first alarm unit 17 outputs a preliminary alarm when the determination unit 143 outputs the second determination result, and outputs this alarm when the determination unit 143 outputs the first determination result.

  Hereinafter, the security system and the window sensor 1 according to the present embodiment will be described in detail.

  As shown in FIG. 2, the window sensor 1 is attached to a sliding-type window 4 provided with a crescent lock 3, and detects the open / closed state of the window 4 and the locked / unlocked state of the crescent lock 3, and transmits radio waves. The detection result is transmitted to the base unit 2 by the radio signal used for the medium. The base unit 2 includes a monitor 21 (notification unit), and displays the opening / closing state and the unlocking / unlocking state of the window 4 detected by the window sensor 1 to notify the user. A plurality of window sensors 1 can be associated with one base unit 2. Identification information of the window sensor 1 is added to the radio signal transmitted by the window sensor 1, and the master unit 2 can display the open / closed state and the unlocked / unlocked state of each window 4 to which the window sensor 1 is attached. . As shown in FIG. 2, the window sensor 1 is set in the parent device 2 with the place (for example, living room 1, living room 2, bedroom 1, etc.) attached. Thereby, the user can easily recognize which window 4 the open / close state and the unlocked state of the window 4 displayed on the monitor 21 of the parent device 2 indicate. In addition, the main | base station 2 may use the thing for exclusive use of the window sensor 1, and may use the controller of HEMS (Home Energy Management System).

  The crescent lock 3 includes a lock body 31 fixed to one window frame 41 of the window 4 and a crescent receiver 32 fixed to the other window frame 41. The lock body 31 includes a rectangular parallelepiped pedestal 33, a half-moon shaped crescent portion 34 provided to be rotatable with respect to the pedestal 33, and a rectangular parallelepiped shaped operation lever 35 connected to one end of the crescent portion 34. When the operation lever 35 is positioned on the crescent portion 34 by rotating the crescent portion 34 with the operation lever 35, the crescent portion 34 is coupled to the crescent receiver 32 and the crescent lock 3 is locked. Become. On the other hand, when the operation lever 35 is located under the crescent portion 34, the coupling between the crescent portion 34 and the crescent receiver 32 is released, and the crescent lock 3 is unlocked. The position of the operation lever 35 when the crescent lock 3 is in the locked state is referred to as a locked position, and the position of the operation lever 35 when the crescent lock 3 is in the unlocked state is referred to as an unlocked position.

  The window sensor 1 includes a sensor body 10 attached to the window frame above the lock body, a first magnet 151 attached to the window glass, and a second magnet 161 attached to the operation lever 35. FIG. 3 shows a schematic configuration diagram of the window sensor 1. Inside the sensor body 10, a battery 11, a window opening / closing detection unit 15, a lock / unlock detection unit 16, and a microcontroller 14 (hereinafter abbreviated as a microcomputer 14) are provided.

  The battery 11 is composed of a coin-type lithium battery and functions as a power source for the window sensor 1.

  The window open / close detection unit 15 includes a magnetoresistive element (MR (Magneto Resistance) element), a Hall element, and the like, and detects an electric signal corresponding to the strength of the received magnetic field when power is supplied from the battery 11. The signal is output to the microcomputer 14 as a signal. The first magnet 151 is attached to the window glass 42. When the window 4 is in the closed position, the distance from the window opening / closing detection unit 15 is shortened, and when the window 4 is in the open position, the window opening / closing detection unit. 15 is disposed at a position where the distance from the terminal 15 becomes longer.

  The microcomputer 14 includes an open / close determining unit 141 that determines the open / closed state of the window 4 based on a detection signal output by the window open / close detecting unit 15. The open / close determination unit 141 compares the detection signal output from the window open / close detection unit 15 with a predetermined threshold value, and determines the open / closed state of the window 4. When the window 4 is in the closed position, the first magnet 151 is located near the window opening / closing detection unit 15, so that the detection signal exceeds the threshold value, and the opening / closing determination unit 141 determines that the window 4 is in the closed state. On the other hand, when the window 4 is in the open position, since the first magnet 151 is located away from the window opening / closing detection unit 15, the detection signal falls below the threshold value, and the opening / closing determination unit 141 indicates that the window 4 is in the open state. to decide. Further, a pair of first yokes 152 is provided so as to sandwich the window opening / closing detection unit from the vertical direction in FIG. The pair of first yokes 152 efficiently transmits the magnetic flux emitted from the first magnet 151 to the window opening / closing detection unit 15 when the window 4 is in the closed position, thereby improving the detection accuracy of the opening / closing state of the window 4. Can be made.

  The locking / unlocking detection unit 16 includes a magnetoresistive element (MR (Magneto Resistance) element), a Hall element, and the like, and detects an electrical signal corresponding to the strength of the received magnetic field when power is supplied from the battery 11. The signal is output to the microcomputer 14 as a signal. The second magnet 161 is attached to the operation lever 35. When the crescent lock 3 is in the locking position, the distance from the locking / unlocking detection unit 16 is shortened, and the second magnet 161 is unlocked when the crescent lock 3 is in the unlocking position. The distance from the lock detection unit 16 is increased.

  The microcomputer 14 includes a locking / unlocking determination unit 142 that determines a locking / unlocking state of the crescent lock 3 based on a detection signal output from the locking / unlocking detection unit 16. The locking / unlocking determination unit 142 compares the detection signal output from the locking / unlocking detection unit 16 with a predetermined threshold value, and determines the locking / unlocking state of the crescent lock 3. When the crescent lock 3 is in the locked position, the detection signal exceeds the threshold because the second magnet 161 is close to the lock / unlock detection unit 16, and the lock / unlock determination unit 142 indicates that the crescent lock 3 is in the locked state. to decide. On the other hand, when the crescent lock 3 is in the unlocking position, the second magnet 161 is located away from the locking / unlocking detection unit 16, so the detection signal falls below the threshold value, and the locking / unlocking determination unit 142 causes the crescent lock 3 to unlock. Judged to be in a locked state. Further, a pair of second yokes 162 are provided so as to sandwich the locking / unlocking detection unit 16 from the left-right direction in FIG. The pair of second yokes 162 efficiently transmits the magnetic flux emitted from the second magnet 161 to the locking / unlocking detection unit 16 when the crescent lock 3 is in the locking position, thereby detecting the locking / unlocking state of the crescent lock 3. Accuracy can be improved.

  Next, a specific configuration of the window sensor 1 will be described using the block configuration diagram shown in FIG.

  In addition to the battery 11, the window opening / closing detection unit 15, the locking / unlocking detection unit 16, and the microcomputer 14, the window sensor 1 includes a transmission unit 12, a voltage monitoring unit 13, and a first alarm unit 17 in the sensor body 10. ing.

  The transmission unit 12 includes a communication interface that transmits a wireless signal, and transmits the wireless signal to the parent device 2. The microcomputer 14 notifies the base unit 2 of the opening / closing state and the locking / unlocking state of the window 4 via the transmission unit 12 when the opening / closing state or the locking / unlocking state of the window 4 changes. The base unit 2 receives the radio signal transmitted from the window sensor 1 and displays the open / closed state and the unlocked state of the window 4 on the monitor 21 (see FIG. 2).

  The voltage monitoring unit 13 monitors the output voltage (hereinafter referred to as power supply voltage) of the battery 11 and includes first to third comparison units 131 to 133.

  The first comparison unit 131 is set with a first threshold value based on the operation lower limit voltage of the transmission unit 12, compares the power supply voltage with the first threshold value, and outputs the comparison result to the microcomputer 14. In the present embodiment, the operation lower limit voltage of the transmission unit 12 is set to the first threshold value. The second comparison unit 132 is set with a second threshold value that is larger than the first threshold value by a predetermined value, compares the power supply voltage with the second threshold value, and outputs the comparison result to the microcomputer 14. The third comparison unit 133 is set with a third threshold value that is smaller than the first threshold value by a predetermined value, compares the power supply voltage with the third threshold value, and outputs the comparison result to the microcomputer 14. The microcomputer 14 includes a determination unit 143 that outputs the first determination result and the second determination result to the first alarm unit based on the determination results of the first comparison unit 131 and the second comparison unit 132. The determination unit 143 outputs the second determination result when the power supply voltage falls below the second threshold, and outputs the first determination result when the power supply voltage falls below the first threshold. Further, the microcomputer 14 includes a reset processing unit 144. The reset processing unit 144 executes a reset process when the power supply voltage falls below the third threshold value. Note that the microcomputer 14 may be configured to include the voltage monitoring unit 13.

  The first alarm unit 17 includes a preliminary alarm unit 171 and a main alarm unit 172, and notifies information about the life of the battery 11 using the preliminary alarm and the main alarm.

  The preliminary alarm unit 171 includes an LED (Light Emitting Diode) (not shown) and a lighting circuit that lights the LED. When the second determination result is output from the determination unit 143, the preliminary alarm unit 171 starts outputting a preliminary alarm that causes the LED to blink. That is, the preliminary alarm unit 171 outputs a preliminary alarm when the power supply voltage falls below the second threshold value. The preliminary alarm may be a continuous lighting of the LED.

  The alarm unit 172 includes a buzzer (not shown) and a drive circuit that sounds a buzzer. When the first determination result is output from the determination unit 143, the alarm unit 172 starts outputting the alarm that intermittently sounds an alarm sound from the buzzer. That is, the alarm unit 172 outputs this alarm when the power supply voltage falls below the first threshold. This alarm may be a continuous alarm sound.

  Next, the output of the preliminary alarm and the main alarm will be described with reference to the waveform diagrams of the power supply voltage shown in FIGS.

  The power supply voltage varies greatly depending on the output current of the battery 11, and is greatly reduced when a radio signal having a relatively large output current is transmitted. 4A to 4C, the transmission period of the radio signal is indicated by T1. As shown in FIG. 4A, when the battery 11 is low, the power supply voltage is maintained at the second threshold value or higher even when an unrelated signal is transmitted, and the preliminary alarm and the main alarm are not output.

  However, as shown in FIG. 4B, when the battery 11 is exhausted, the power supply voltage falls below the second threshold when the wireless signal is transmitted, and the output of the preliminary alarm (LED blinking) is started ( Time t1). In FIGS. 4B and 4C, the preliminary alarm output period is indicated by T2. The preliminary alarm unit 171 continues to output the preliminary alarm even when the transmission of the radio signal is completed and the power supply voltage returns to the second threshold or higher. That is, the preliminary alarm unit 171 continues to output the preliminary alarm when the power supply voltage falls below the second threshold even once. Here, the power supply voltage of the battery 11 may increase or decrease due to the influence of the ambient temperature. Even when the power supply voltage has previously fallen below the second threshold, the power supply voltage at the time of transmission of the radio signal may be maintained at or above the second threshold (see FIG. 4B).

  Further, the determination unit 143 notifies the base unit 2 via the transmission unit 12 in addition to the first alarm unit 171 in addition to the second determination result. The monitor 21 of the parent device 2 serves both as a notification unit that notifies the state of the window 4 (open / closed state / locked / unlocked state) and a second alarm unit that notifies information related to the life of the battery 11. Then, base unit 2 receives the second determination result and outputs an alarm corresponding to the preliminary alarm (for example, an icon for prompting battery replacement is displayed on monitor 21).

  Then, as shown in FIG. 4C, when the battery 11 further depletes, the power supply voltage falls below the first threshold when the wireless signal is transmitted, and the output of this alarm (intermittent alarm sound) is started. (Time t2). In addition, in FIG.4 (c), the output period of this alarm is shown by T3. Here, since the first threshold value is set to the operation lower limit voltage of the transmission unit 12, if the power supply voltage falls below the first threshold value, there is a possibility that data cannot be transmitted normally. Therefore, when the power supply voltage falls below the first threshold, the microcomputer 14 stops the transmission of the radio signal (time t2). Further, the alarm unit 172 continues to output the alarm even when the transmission of the wireless signal is stopped and the power supply voltage returns to the first threshold value or higher. That is, this alarm unit 172 continues to output this alarm when the power supply voltage falls below the first threshold even once. Further, the microcomputer 14 stops the transmission of the wireless signal even when the alarm is being output, when the transmission of the wireless signal is attempted and when the power supply voltage falls below the first threshold again. Further, the power supply voltage at the time of transmission of the radio signal may be maintained at the first threshold value or more due to the influence of the ambient temperature, and the radio signal may be transmitted (see FIG. 4C). In this case, the determination unit 143 notifies the parent device 2 of the first determination result via the transmission unit 12. And the main | base station 2 receives the 1st judgment result, and outputs the alarm equivalent to this alarm (for example, the icon which shows a battery exhaustion is displayed on the monitor 21).

  When the power supply voltage falls below the third threshold, the reset processing unit 144 of the microcomputer 14 executes the reset process, the preliminary alarm and the main alarm are stopped, and the window sensor 1 is shut down (time t3).

  As described above, in this embodiment, before the wireless signal transmission becomes impossible due to the battery exhaustion, a preliminary alarm for prompting the battery replacement is output, and the user is prompted to replace the battery 11, thereby forgetting to replace the battery 11. Can be prevented. In addition, the power supply voltage is greatly reduced when a radio signal is transmitted (see FIGS. 4A to 4C). Therefore, when the user opens / closes or locks / unlocks the window 4, there is a high probability that a radio signal is transmitted and the output of the preliminary alarm is started. Therefore, the user needs to immediately replace the battery 11 for the preliminary alarm. Can be recognized. Furthermore, since the preliminary alarm continues to be output after the power supply voltage falls below the second threshold even once, the user is more easily aware of the preliminary alarm and can prevent the battery 11 from being forgotten to be replaced. Moreover, since the light alarm by blinking LED is used for the preliminary alarm, even if there is no replacement battery 11 and the battery cannot be replaced immediately, the user's discomfort can be reduced. Moreover, since the blinking of the LED is used as a preliminary alarm, power consumption is relatively small, and the preliminary alarm can be output for a long time.

  When the battery is not exchanged during the preliminary alarm and the wireless signal cannot be transmitted, the main alarm for notifying the battery is output. Like the preliminary alarm, when the user opens / closes or locks / unlocks the window 4, there is a high probability that the output of this alarm will start, the user immediately notices this alarm, and the window sensor 1 becomes inoperable due to the battery running out. Can be recognized. Furthermore, since the alarm continues to be output after the power supply voltage falls below the first threshold even once, the user is more likely to notice the alarm. Moreover, since the sound alarm by an intermittent alarm sound is used for this alarm, the user does not need to look at the window sensor 1 and can improve the probability of noticing this alarm.

  Further, since the alarm corresponding to the preliminary alarm and the main alarm is also output from the master unit 2, it is possible to further prevent the battery 11 from being forgotten to be replaced.

  In the present embodiment, the present alarm (intermittent alarm sound) is set so that the drive current is smaller than the transmission of the radio signal. Thereby, this alarm can be output over a long period of time, and the user can be surely notified that the battery is dead.

  The security system of the present embodiment uses the window 4 as a detection target and detects the state of the window 4 (open / closed state, unlocked / unlocked state). However, the type of sensor is limited to the window sensor 1. Instead, any sensor that detects the state of the detection target using the battery 11 as a power source may be used. For example, the sensor may be composed of a glass breakage sensor that detects glass breakage, a door sensor that detects the open / closed state of a door, an entry sensor that detects entry into a detection range, a fire detector that detects fire, and the like.

DESCRIPTION OF SYMBOLS 1 Window sensor 11 Battery 12 Transmission part 13 Voltage monitoring part 14 Microcomputer 143 Judgment part 15 Window opening / closing detection part 16 Locking / unlocking detection part 17 1st alarm part 2 Parent machine

Claims (6)

With a battery as a power source, a sensor that detects the state of the detection target and transmits the detection result by a radio signal,
A master unit having a notification unit that receives the wireless signal and notifies the detection target state;
The sensor is
A transmitter for transmitting the wireless signal;
The output voltage of the battery is monitored, a first threshold value based on an operation lower limit voltage of the transmission unit and a second threshold value that is larger than the first threshold value by a predetermined value are set, and the output voltage of the battery And a voltage monitoring unit that compares the first threshold and the second threshold;
A determination that outputs a first determination result when the output voltage of the battery is lower than the first threshold value, and a second determination result that is output when the output voltage of the battery is lower than the second threshold value. And
A first alarm unit for informing information on the life of the battery,
The first alarm unit outputs a preliminary alarm when the determination unit outputs the second determination result, and outputs a main alarm when the determination unit outputs the first determination result. Security system. The security system according to claim 1, wherein the sensor is a window sensor that detects at least one of an open / closed state and a locked / unlocked state of a window. The security system according to claim 1, wherein the transmission unit stops transmission of the radio signal when the determination unit outputs the first determination result. The determination unit notifies the master unit via the transmission unit in addition to the first warning unit in addition to the second determination result,
The base unit includes a second alarm unit that receives the second determination result and outputs an alarm corresponding to the preliminary alarm. 4. Security system. When the transmission unit is operable during the output of the main alarm, the determination unit notifies the first determination result to the parent device via the transmission unit in addition to the first alarm unit. And
The base unit includes a second alarm unit that receives the first determination result and outputs an alarm corresponding to the main alarm. 5. Security system.   The sensor used for the security system of any one of Claims 1 thru | or 5.

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