JP2008287380A - Breakdown detector for window glass - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically detect that a window glass is artificially broken and a glass window is unexpectedly opened to immediately emit a warning. <P>SOLUTION: A breakdown detector for a window glass provided with a resonator 2 that detects a signal of a specified frequency component from an electric signal that is output from a piezoelectric sensor 1 that resonates to a supersonic wave of a frequency band that is generated immediately after a window glass is broken, and a magnetic detection sensor 7 that detects magnetism blocking the movement of the resonator 2, includes an opening/closing detection sensor 6 that magnetically detects the opening/closing of a glass window 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a window glass destruction detection apparatus that automatically detects that a thief or the like has destroyed a window glass of a detached house or an apartment.

Recently, in addition to picking theft crimes that lock the entrance door and sneak into the interior, theft crimes that destroy the window glass of condominium verandas and detached window glass and enter the interior are increasing. On the other hand, in order to deal with such crimes such as theft, it is possible to capture the criminal's image with a security camera such as an infrared camera so that the criminal can be accurately determined (for example, see Patent Document 1). There have been proposed a method and an apparatus in which an impact sensor or the like is attached and a window glass is broken or a loud alarm sound is generated when an impact is applied to the window glass.
Utility Model Registration No. 3025573

  However, in the method for identifying a criminal using the security camera, the operation and management of the security camera is troublesome, the alarm system becomes expensive, and there is a disadvantage that it is versatile. On the other hand, a window glass break detection device using an impact sensor detects an impact applied to the window glass, so that not only the window glass is broken, but also the vibration sound generated by the window glass when exposed to rain and wind. In addition, there is an inconvenience that it responds to noise and impact sound generated in the surrounding environment, and an alarm is also generated due to factors other than the destruction of the window glass.

  The present invention solves the conventional problems as described above, and enables window glass breakage to be accurately detected by distinguishing it from window glass vibrations caused by other factors. Another object of the present invention is to provide a window glass breakage detection device that can be implemented without being obstructed by a deliberate act and that can detect opening and closing of a window by a criminal with a versatile, simple and inexpensive configuration.

  In order to achieve the above-mentioned object, the window glass breakage detection apparatus according to the present invention is a resonance for detecting a signal of a specific frequency component from an electric signal output from a piezoelectric sensor by resonating with an ultrasonic wave having a frequency just before the glass breaks. And a magnetic detection sensor for detecting magnetism that interferes with the operation of the resonator, characterized in that it includes an open / close detection sensor that magnetically detects opening and closing of the glass window. (Claim 1).

  According to the above configuration, when the detection opening / closing sensor detects opening / closing of a window, an alarm can be automatically generated and the window glass is artificially broken without being caused by external factors such as rain and wind. In addition to being able to detect accurately and automatically, an alarm sound can be generated, and a disturbing action for detecting the breakage of the window glass can also be detected to generate an alarm.

  In the window glass breakage detection device according to the present invention, the open / close detection sensor is a reed switch that also serves as the magnetic detection sensor, and the reed switch is turned off when the window is closed. A magnet that passes over the reed switch is attached to a window frame or a window glass so that the reed switch is turned on when the door is opened (Claim 2).

  With this configuration, the number of reed switches installed can be reduced, and the simplification and low cost of the apparatus can be realized.

  Moreover, the window glass breakage detection apparatus according to the present invention is characterized in that at least two open / close detection sensors are installed so as not to line up on a vertical line.

  By the said structure, it can detect reliably that the glass window was released or closed by the criminal, for example.

  In addition, the window glass breakage detection apparatus according to the present invention is provided with a buzzer or a transmitter that receives an output of the magnetic detection sensor or the open / close detection sensor and outputs an alarm (Claim 4).

  With the above configuration, when detecting the disturbance of the operation of the resonator or opening / closing of the glass window, it is confirmed that the criminal is invading an unspecified number of people in the vicinity, or a specified number of remote persons or an unspecified number of people. Can be notified.

  Further, the window glass breakage detection apparatus according to the present invention includes a reduced voltage measuring circuit that uses a battery as a power source and periodically applies a load to the battery to measure a reduced voltage of the battery voltage. Item 5).

  With this configuration, the battery voltage can be periodically checked, battery replacement is promoted as necessary, and malfunctions and malfunctions of an alarm device or the like based on a decrease in battery voltage can be avoided.

  According to the present invention, the destruction of the window glass can be accurately detected by distinguishing it from the vibration of the window glass caused by other factors, and this detection can be carried out without being obstructed by the criminal act. It is possible to reliably detect the opening and closing of the window by a simple configuration.

  Embodiments of the present invention will be described below with reference to the drawings. The window glass breakage detection apparatus according to the embodiment of the present invention basically has a specific frequency component by a resonator based on an electric signal output from a piezoelectric sensor by resonating with an ultrasonic wave having a frequency just before the glass breaks. A signal is detected, and on the other hand, magnetism that interferes with the operation of the resonator is detected by a magnetic detection sensor, and opening / closing of a window is detected magnetically by an open / close detection device.

  Therefore, the window glass breakage detection apparatus of the present invention can automatically detect that the window glass has been broken artificially and generate an alarm without depending on external factors such as rain and wind. Moreover, it can prevent reliably that the destruction detection operation | movement of a window glass is avoided by the artificial operation using the magnet by a criminal. Furthermore, when the open / close detection sensor detects the opening / closing of the glass window, an alarm can be automatically generated.

  FIG. 1 is a block diagram showing the entire window glass breakage detection apparatus according to the present embodiment.

  In FIG. 1, a window glass breakage detection apparatus according to the present embodiment includes a piezoelectric sensor 1, a resonator 2, a timer 3, an alarm device drive circuit 4, an alarm device 5, an open / close detection sensor 6, and magnetic detection. A sensor 7, a transmission circuit 8, an antenna 9, a transmission indicator 10, a transmission channel setting switch 11, a reduced voltage measurement circuit 13, and a microcomputer 12 are provided.

  The piezoelectric sensor 1 is a piezoelectric ceramic that outputs an electrical signal by resonating with a preset frequency band, for example, 50 KHz to 250 KHz, and the piezoelectric sensor 1 is attached to a part of a window glass. Fitted by. The ultrasonic waves of 50 KHz to 250 KHz are generated just before the glass plate breaks (breaks), and may include ultrasonic waves other than the ultrasonic waves accompanying the breakage of the glass. That is, the piezoelectric sensor 1 has a high sensitive band over a wide band as shown in FIG. The piezoelectric sensor 1 corresponds to a glass break sensor described later.

  The resonator 2 is an LC resonator or the like connected to the piezoelectric sensor 1 and functions to remove unnecessary noise and detect only a specific component required in the frequency band. According to the LC resonator 2, as shown in FIG. 3, a high Q characteristic is obtained, and for example, only the output level of the necessary 150 KHz ultrasonic wave (which can specify glass breakage) is stepped up. For this reason, it is not necessary to separately prepare an amplifier or the like for amplifying the detected ultrasonic signal, and therefore power consumption can be suppressed to an extremely low level.

  The timer 3 is connected to the resonator 2 via the microcomputer 12, and when it is determined that the level of the ultrasonic output detected by the resonator 2 has exceeded the set level, the microcomputer 12, for example, only for 30 seconds. It functions to continuously output the alarm signal generated by. The alarm drive circuit 4 functions to drive the alarm 5 upon receiving an output signal (alarm signal) from the timer 3. As the alarm device 5, a piezoelectric plate or a resonator that vibrates in response to the boosted power of the alarm device drive circuit 4 and generates a vibration sound is used.

  The opening / closing detection sensor 6 functions to detect opening / closing of a glass window. As shown in FIG. 4, for example, a magnet 15 attached to a movable glass window (including a window frame) 14 and a fixed glass window. And 16 reed switches attached to the window glass. The magnetic detection sensor 7 functions to detect magnetism that interferes with the operation of the resonator 2, and includes, for example, the reed switch 17 that is turned on when magnetism is detected. The reed switch 17 functions to immediately drive the alarm device drive circuit 4 to generate an alarm from the alarm device 5 when an abnormally high level of magnetism is detected.

  The reed switch 17 used as the open / close detection sensor 6 and the reed switch 18 used as the magnetic detection sensor 7 are housed in one case 19 together with the piezoelectric sensor 1 as a glass breakage sensor. Then, it is attached to the window glass of the glass window 16 with an adhesive or the like.

  The transmission circuit 8 functions to wirelessly transmit the alarm signal to the outside through the antenna 9. The receiver of the alarm signal transmitted wirelessly is a monitoring system of a security company or a mobile device such as a mobile phone possessed by an individual. The alarm signal can be transmitted to the outside by wire. The transmission indicator 10 functions to display that an alarm signal is being transmitted. For example, a light emitting diode is used.

  The transmission channel setting switch 11 is a switch that makes it possible to select a frequency assigned to each channel, and assigns a specific frequency to one or a plurality of alarm devices installed at a plurality of locations to selectively output an alarm signal. Can be sent. The reduced voltage measuring circuit 13 functions to periodically apply a load to a battery that supplies power to the entire apparatus and measure the reduced voltage of the battery voltage. The microcomputer 12 functions to control the operation of each element and circuit and process signals.

  Next, the operation of the window glass breakage detection apparatus having the above configuration will be described. Now, when a thief or the like breaks a window glass and enters the room, the piezoelectric sensor 1 detects an ultrasonic signal that resonates in the vicinity of 50 KHz to 250 KHz, for example, just before the window glass is broken. And converted into an electrical signal.

  Only the required frequency (for example, 150 kHz) component of the electrical signal is detected by the resonator 2. When the microcomputer 12 determines that the frequency component signal has a magnitude exceeding a set level, the microcomputer 12 outputs an alarm signal, and the alarm driver 4 is informed to the alarm driver 4 only for a time set by the timer 4, for example, 30 seconds. The alarm device 5 is activated.

  Due to the operation of the alarm device 5, a loud sound is emitted in the vicinity, and it is possible to notify the periphery that the thief has entered the room. As a result, the thief can be astonished and quickly dismissed from the scene.

  As described above, by automatically detecting only an ultrasonic wave of a specific frequency based on glass breakage and generating an alarm, a false alarm based on detection of vibration due to rain, wind, etc. can be performed as in the past. It is possible to avoid inconveniences such as an extra troublesome switch operation to prevent an alarm.

  In addition, the thief makes a magnet prepared by the thief close to the resonator (LC resonator) 2 to change the resonance frequency of the resonator 2, thereby reducing the operation sensitivity of the resonator 2, and the alarm drive The operation of the circuit 4 may be disturbed. In this case, the generation of an alarm sound from the alarm device 5 is prevented.

  However, in the present embodiment, the reed switch 18 as the magnetic detection sensor 7 detects magnetism exceeding a predetermined level generated by the magnet, and the microcomputer 12 outputs an alarm signal based on the detection result. Output to the instrument driver 4. For this reason, the alarm driver 4 causes the alarm 5 to generate a loud sound only for 30 seconds as described above.

  The occurrence of theft can be notified to the surroundings by sounding an alarm sound even with the above-described interference by the magnet. As a result, the thief or the like can be quickly dismissed. At the same time, since the alarm signal is also input to the transmitter 9, it can be notified to a receiver remote from the alarm body. On the receiver side as well, it is possible to notify that the thief or the like is invading by sounding an alarm sound, and to take necessary measures such as notifying the security company or the like from the outside.

  On the other hand, when a thief or the like tries to open the glass window 14, the open / close detection sensor 6 immediately detects this. As described above, the open / close detection sensor 6 includes the magnet 15 on the glass window 14 side and the reed switch 17 installed on the glass window 16 side in the same horizontal plane. Accordingly, the magnet 15 moves away from the reed switch 17 and the reed switch 17 is switched from on to off, for example, so that the glass window 14 is opened to move in the direction of arrow P with respect to the glass window 16. It can be detected by changing.

  For this reason, when the microcomputer 12 detects the output of the reed switch 17, the microcomputer 12 outputs an alarm signal to the alarm device drive circuit 4 through the timer 3. Therefore, when the glass window 14 is opened, the alarm device 5 immediately generates a loud sound, so that the thief can be effectively surprised and quickly dissipated.

  FIG. 5 shows a window glass breakage detection device in which the window glass breakage sensor 1 and one reed switch 17 that is used for both magnetic interference detection and opening / closing detection of the glass window 14 are housed in one case 19. Show. In the window glass breakage detection apparatus, when the glass window 14 is opened, the magnet 15 passes over the reed switch 17, and the reed switch 18 is turned on within a predetermined movement region of the glass window 14.

  Accordingly, even when the glass window 14 is closed, the reed switch 17 is turned on in the moving region, and the closing operation of the glass window 14 can be detected.

  On the other hand, when the glass window 14 is closed, the reed switch 17 is off. At this time, if the window glass 16 is broken, the piezoelectric sensor 1 can detect this and give an alarm as described above. Further, in order to disturb the detection of breakage of the glass window 16, a magnet (not shown) may be brought close to the outside of the glass window 16. In this case, the reed switch 17 is turned on. Therefore, the alarm as described above can prevent the destruction from being detected.

  FIG. 6 shows a window glass breakage detection device that can detect both the open and closed states of the glass window 14. Here, the reed switches 17A and 17B as the open / close detection sensor 6 and the magnet 15 are juxtaposed in the open / close direction of the glass window 14 (in the same horizontal plane). Moreover, the space | interval of the said reed switches 17A and 17B and the magnitude | size of the said magnet 15 are set appropriately, and the area | region where the said 2 reed switches 17A and 17B are turned ON simultaneously during opening / closing operation | movement of the said glass window 14 is provided. .

  Therefore, when the glass window 14 opens in a direction overlapping the glass window 16, the reed switch 17A is turned on prior to the reed switch 17B, and then the reed switch 17A is turned on while the reed switch 17B is on. Is turned off. Thereafter, the reed switch 17B is turned off with a delay. This is shown in FIG. Thereby, after the reed switch 17A is turned off, it can be determined that the glass window 14 has been opened when the reed switch 17B changes from on to off.

  On the other hand, in the process of closing the glass window 14, as shown in FIG. 7B, after the reed switch 17B is turned off, the glass window 14A is changed from on to off. 14 can be determined to be in the closed state. The computer monitors the on / off states of the reed switches 17A and 17B according to a program, so that it is possible to easily determine whether the glass window 14 is open or closed and display it as necessary.

  In addition, in the above, in order to simplify description, the case where the case 19 of the window glass breakage detection apparatus was provided only on the glass window 16 side was described. However, in practice, the same case 19 is attached to the glass window 14 in order to detect the breakage of the window glass on the glass window 14 side.

  As described above, the window glass breakage detection apparatus according to the present embodiment detects a signal having a specific frequency component from the electrical signal output from the piezoelectric sensor 1 by resonating with an ultrasonic wave having a frequency generated just before the window glass 14 is broken. In a window glass breakage detecting device comprising a resonator 2 that detects and a magnetism detection sensor 18 that detects magnetism that interferes with the operation of the resonator 2, an open / close detection sensor 17 that magnetically detects opening and closing of the glass window 14. It is the structure provided with.

  Therefore, with this configuration, it is possible to accurately and automatically detect that the window glass of the glass window 16 has been artificially broken without causing external factors such as rain and wind, and generate an alarm sound. Can do. In addition, an alarm can be generated by detecting a disturbing action for detecting the breakage of the window glass. Furthermore, when the opening / closing detection sensor 6 (reed switch 17) detects the opening / closing of the glass window 14, an alarm can be automatically generated.

  The window glass breakage detection device of the present invention makes it possible to accurately detect the breakage of the window glass by distinguishing it from the vibration of the window glass caused by other factors, and this detection operation is obstructed by the act of the criminal. It has the effect of being able to detect the opening and closing of windows by the criminal with a versatile, simple and inexpensive configuration, and automatically detects that the thief has broken the window glass of a detached house or apartment. It is useful for window glass breakage detection devices.

It is a block diagram which shows the window glass breakage detection apparatus by embodiment of this invention. FIG. 2 is a frequency characteristic diagram of the piezoelectric sensor shown in FIG. 1. FIG. 2 is a frequency characteristic diagram of the resonator shown in FIG. 1. It is a front view which shows the glass window with the window glass breakage detection apparatus by embodiment of this invention. It is a front view which shows the glass window with the other window-glass destruction detection apparatus by embodiment of this invention. It is a front view which shows the glass window with the other window-glass destruction detection apparatus by embodiment of this invention. It is a timing chart which shows the opening-and-closing direction detection waveform of the glass window by two reed switches in this embodiment.

Explanation of symbols

1 Glass breakage sensor (piezoelectric sensor)
DESCRIPTION OF SYMBOLS 2 Resonator 3 Timer 4 Alarm drive circuit 5 Alarm 6 Opening / closing detection sensor 7 Magnetic detection sensor 8 Transmitter 9 Antenna 10 Transmission indicator 11 Transmission channel setting switch 12 Microcomputer 13 Reduced voltage measurement circuit 14, 16 Glass window 15 Magnet 17, 17A, 17B, 18 Reed switch 19 Case

Claims (5)

A resonator that detects a signal of a specific frequency component from an electrical signal output from a piezoelectric sensor by resonating with an ultrasonic wave having a frequency generated just before the glass breaks, and a magnetic detection sensor that detects magnetism that interferes with the operation of the resonator. And a window glass breakage detection apparatus comprising: an opening / closing detection sensor that magnetically detects opening / closing of the glass window. The window glass breakage detection device according to claim 1, wherein the open / close detection sensor is a reed switch that also serves as the magnetic detection sensor, and the reed switch is turned off when the window is closed. A window glass breakage detecting device, wherein a magnet passing through the reed switch is attached to a window frame or window glass so that the reed switch is turned on when the door is opened. The window glass breakage detection apparatus according to claim 1, wherein at least two of the open / close detection sensors are installed at positions that do not line up on a vertical line. The window glass breakage detection apparatus according to claim 1, further comprising a buzzer or a transmitter that receives an output of the magnetic detection sensor or the open / close detection sensor and outputs an alarm. 2. The window glass break detection device according to claim 1, further comprising a reduced voltage measuring circuit that uses a battery as a power source and periodically applies a load to the battery to measure a reduced voltage of the battery voltage. Destruction detection device.

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