JP2005189124A - System for sensing breakage and movement of glass - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for sensing breakage and movement of a glass, which eliminates the need for wiring a plate glass with a conductive wire to be energized and senses the breakage, the movement or opening of the plate glass used for a window or a showcase in a building and an automobile, and to sense an illegal intruder or a robber who breaks, opens or moves the plate glass. <P>SOLUTION: The system for sensing the breakage and movement of the glass, is equipped with an electric wave oscillator; the plate glass which blocks electric waves transmitted from the electric wave means; and a receiver which is disposed on the opposite side of the electric wave oscillator so that the plate glass is sandwiched by them. In the system, the intensity of the electric wave is measured by the receiver, and the absence of the plate glass due to the breakage or the movement of the plate glass is sensed from a change in the intensity of the electric wave. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a system for detecting illegal intrusion into buildings or automobiles, and theft of precious metals in showcases, etc., and breaking, opening, and moving of glass in apparatus buildings or automobile windowglasses and showcases made from flat glass. It is a glass breakage movement detection system that detects

  In recent years, there has been an increase in damage caused by burglary by destroying window glass or doors of houses, or by theft by destroying window glass of automobiles. In addition, there is the destruction of the showcase itself, the destruction of the keys, theft of precious metals inside the showcase by unlocking, the destruction of window glass or doors of houses, the destruction of automobile windows, the destruction of showcases and fraud The following techniques are known for detecting movement and preventing theft.

  For example, Patent Document 1 or Patent Document 2 discloses a glass breakage detector that is used by being bonded to a glass surface and picks up vibrations and sounds that are generated when the glass is broken. The glass breakage detectors described in these publications need to supply electric power from a battery or a power source to the detector, but the batteries need to be replaced periodically. On the other hand, the power supply from the power source requires wiring to the glass breakage detector, but it is difficult to wire the sliding window or the like so that the wiring is not exposed. In addition, there is a concern that the detector may drop off due to deterioration of the adhesive used to fix the detector to the glass, drop off due to impact, or malfunction. In addition, the sash generally used for sliding windows in houses is low in strength, and a bar is inserted between the sash of the outer frame and the sash of the inner frame to forcibly open the window without breaking the glass. It is difficult to respond to intrusions.

  On the other hand, Patent Document 3 is glass used for an opening of a building such as a house, and a circuit network made of a conductive material is disposed on the surface in the width direction of the glass at intervals smaller than the width of the intruder. An electric circuit is configured, and when the glass is broken, a circuit network made of the conductive material is broken at the same time so that the electric circuit is cut off, and a glass having a crime prevention function in which an alarm device is activated is disclosed. ing. However, in the case of intrusion damage such as in a house where the window glass is broken by a driver or the like and the crescent lock is unlocked, the hole opened by the driver is a small hole close to the diameter of the driver. The distance between the lines becomes narrow, and the function as a light-transmitting window needs to be impaired. When a wire is enclosed and an electric circuit is formed in the glass, there is a concern that even if the glass is broken, the wire is not cut and breakage is not detected. Furthermore, there is a concern such as leakage due to energization of the network. Further, it is difficult to wire a movable window such as a sliding window, and it is difficult to cope with an intrusion that forcibly opens the window without breaking the glass using the above-described bar or the like.

  On the other hand, in Patent Document 4, a plate glass having a conductive member formed on the surface thereof is disposed in an opening in a building, a power source is connected to the conductive member to conduct electricity, and a detection unit is connected to the conductive member. A security sensor configured to detect unauthorized entry into a building by detecting a change in resistance value due to breakage of the conductive member is disclosed. However, it is difficult to wire a movable window such as a sliding window, and there is a concern of leakage during normal use because it is energized. Furthermore, there is a concern that the method for forcibly opening the window without breaking the glass using the above-mentioned bar cannot be used.

  Non-Patent Document 1 introduces laminated glass as glass that can be expected to have crime prevention performance. However, even if laminated glass is used in place of single plate glass, it is possible to break and invade laminated glass only by extending the time required for breaking. Even if laminated glass is used, the sliding window cannot cope with a method of forcibly opening the window without breaking the glass using the aforementioned bar.

In addition, monitoring using a video camera is also known. However, when monitoring with a video camera, it is necessary to always monitor it. For example, if the camera is indoors in a residential window, if a curtain or the like is between the window and the camera, destructive action is being performed. Discrimination becomes difficult.
JP 2000-48268 A Japanese Patent No. 3387572 JP 2002-163732 A JP 2003-187344 A “Plate Glass Association Standards on Glass Security Performance” in the “Glass for Security Glass (2002.3)” formulated by the Functional Glass Promotion Council

  The present invention provides a glass breakage movement detection system that detects breakage, opening, or movement of a plate glass in a window glass or a showcase of a building or an automobile, and that does not require energization by arranging a conductive wire on the plate glass. The purpose is to detect illegal intrusion and theft by destroying, opening, or moving.

  The glass breakage movement detection system of the present invention uses a plate glass that shields radio waves on a plate glass constituting a window glass or showcase of a building, an automobile, and a radio wave oscillator is installed on either the indoor side or the outdoor side of the plate glass If the receiver is installed on the opposite side of the radio wave oscillator, the radio wave oscillator side, or both with the glass in between, the strength of the radio wave will change when the plate glass is broken, opened or moved. It is a glass break movement detection system that detects with a receiver, and detects illegal intrusion by breaking, opening, or moving a sheet glass from inside, outside, or far away from the building.

  The present invention comprises a radio wave oscillator, a plate glass that shields the radio wave transmitted by the radio wave oscillating means, and a receiver provided on the opposite side of the radio wave oscillator side. This is a glass breakage movement detection system that detects the disappearance of a plate glass accompanying movement by a change in radio field intensity.

  Further, the present invention comprises a radio wave oscillator, a plate glass that shields the radio wave transmitted by the radio wave oscillation means, and a receiver provided on the radio wave oscillator side with respect to the plate glass, and the radio wave intensity of the radio wave reflected by the plate glass Is a glass breakage movement detection system characterized in that the loss of the plate glass due to the breakage or movement of the plate glass is detected by a change in radio wave intensity.

  Furthermore, the present invention comprises a radio wave oscillator, a plate glass that shields the radio wave transmitted by the radio wave oscillation means, and a receiver provided on both the radio wave oscillator side and the opposite side of the radio wave oscillator across the plate glass. The glass breakage movement detection system is characterized in that the intensity is measured by both receivers, and the loss of the plate glass due to the breakage or movement of the plate glass is detected by a change in radio wave intensity.

  In the glass breaking movement detection system of the present invention, the radio waves are shielded by covering the surface of the plate glass with a conductive film on the surface of the plate glass, thereby reflecting and shielding the radio wave by the surface skin current induced by the incident radio wave.

  Furthermore, the present invention is the glass breakage movement detection system described above, wherein the plate glass is a plate glass provided with a coating for shielding radio waves on the surface to shield the radio waves.

  Furthermore, the present invention is the glass breakage movement detection system described above, wherein the plate glass is a multi-layer glass.

  Furthermore, the present invention is the above glass break movement detection system, wherein the plate glass is a tempered glass.

  Furthermore, the present invention is the glass breakage movement detection system described above, wherein the plate glass is a laminated glass.

  The glass breakage movement detector of the present invention detects any breakage, opening, and movement of glass sheets in buildings, automobile windows, and showcases, and requires energization by arranging conductive wires on the glass sheets. Furthermore, even if a curtain or the like is installed between the opening and the detector, the detection is not hindered.

  In order to shield radio waves with a plate glass, a conductive film is coated on the plate glass surface.

  FIG. 1 is a perspective view for explaining the concept of the glass breaking movement detection system of the present invention.

  As shown in FIG. 1, the radio wave incident on the plate glass G from the radio wave oscillator 1 is reflected and passes through the plate glass G if the plate glass G is, for example, a plate glass with a conductive film and shields the radio wave. It is shielded without. At this time, the receiver 2 arranged on the radio wave oscillator 1 side with respect to the plate glass G detects radio waves, but the receiver 3 arranged on the opposite side of the radio wave oscillator 1 across the plate glass G does not detect radio waves. .

  On the other hand, if the plate glass G is broken or moved and disappears, the radio wave intensity detected by the receiver 2 is reduced, the radio wave intensity received by the receiver 3 is remarkably increased, and the radio wave intensity is reduced due to the disappearance of the plate glass G. It changes before and after. In the glass breakage movement detection system of the present invention, if the change in strength is significant and out of the range of change set in advance to prevent malfunction, it is assumed that an abnormality such as breakage or movement has occurred in the sheet glass G. Is detected.

On the other hand, what is defined as “radio waves” by the International Telecommunication Convention has a frequency of 3 THz (3 terahertz; 3 × 10 ¹² Hz) or less. Among these, it is preferable that the radio wave used for the glass breakage movement detection system of the present invention uses an electromagnetic wave having a frequency corresponding to the radio wave shielding characteristics of the glass coated with the conductive film. In particular, it is more preferable to use a radio wave having a short wavelength of 1 GHz or more because the directivity of the radio wave is increased and the influence of noise from surrounding objects is reduced. Examples of radio waves of 1 GHz or higher include radio waves of 2.45 GHz used for wireless LANs, and output of 10 mW or lower with no problem with the radio law and having an electromagnetic wave intensity of 90 dB or higher.

  The performance of shielding the radio wave of the glass sheet G is only required to be able to detect a change in the intensity of the radio wave that occurs during breakage or movement. Preferably, the radio wave detected by the receiver 2 or the receiver 3 has a reception gain of 10 dB or more, preferably 20 dB or more. If shielded, the intensity change of the radio wave at the time of disappearance of the plate glass G becomes large, and it is easy to detect destruction and movement.

  Further, in the present invention, instead of providing the radio wave oscillator 1, when there is a broadcasting station around and the broadcast radio wave is strong, the broadcast radio wave can be used. May be used in combination.

  On the other hand, in a portion that is not covered with the plate glass G in the present invention, it is easier to detect a change in strength caused by the breakage or movement of the plate glass G by shielding the radio wave with a wire mesh or a ferrite sheet.

  Further, the plate glass G used for windows and showcases that require daylighting and transparency is transparent inorganic plate glass such as soda lime silicate glass, borosilicate glass, silica glass, crystallized glass, acrylic, polycarbonate, or Organic plate glass made of transparent plastics such as vinyl chloride is used alone or in combination, and can be used in the glass breakage movement detection system of the present invention. In the glass breakage movement detection system of the present invention, when a metal thin film is coated as a conductive film on the surface of the glass sheet G by sputtering, vapor deposition, or applying a coating liquid for forming a conductive film, etc., the glass sheet G shields radio waves. Since added value such as heat ray shielding can be added without impairing the original transparency of the plate glass G, it is particularly preferable to cover the plate glass G with a transparent conductive film. Examples of such a transparent conductive film include an ITO film which is a doped oxide film of indium and tin, an Ag film, a film in which an Ag film and a dielectric film are stacked, a tin oxide film, in other words, a NESA film.

  In addition, although laminating | stacking with the plate glass G and the metal plate and metal mesh which have electroconductivity is mentioned, lighting and transparency are impaired.

  The plate glass G that shields radio waves used in the glass breaking movement detection system of the present invention is preferably a multi-layer glass. Multi-layer glass is glass in which an internal space is provided between a plurality of plate glasses G for heat insulation effect, sound insulation effect and the like. The interior space is usually air, but in order to further enhance the heat insulation effect and the sound insulation effect, the interior space may be depressurized to be in a vacuum state or filled with gas. For example, when a conductive film that shields radio waves is coated on the glass surface on the inner space side of the multilayer glass, it is possible to prevent damage to the conductive film, deterioration due to moisture in the air, and the like. Furthermore, if the conductive film is coated on the inner space side of the outdoor glass in the multilayer glass, the intensity of the radio wave received by the receiver 2 or the receiver 3 changes when the outdoor glass is broken. Glass breakage can be detected at an early stage.

  Tempered glass is obtained by heating a plate glass to near the softening point and then cooling it by blowing air to provide a compression layer on the glass surface, and has higher strength than ordinary glass. Further, when the conductive film is coated on the tempered glass, if the glass is broken, the entire tempered glass is broken into fine granular fragments and dropped off, so that the intensity of the radio wave received by the receiver 2 or the receiver 3 changes greatly. The breakage of the glass sheet G is more easily detected by the glass breakage movement detection system.

  Laminated glass is one in which an adhesive film is sandwiched between a plurality of plate glasses G in order to prevent scattering of the glass when broken, etc., and is usually polyvinyl butyral, that is, PVB so as not to impair transparency. , Ethylene vinyl acetate, ie EVA, acrylic transparent resin and urethane transparent resin, etc. are sandwiched between the glass to form an adhesive layer, and the intermediate layer is difficult to break, so only the plate glass G, in other words, the crime prevention effect compared to the single plate glass Is expensive. Therefore, it is preferable to use laminated glass for the glass breakage movement detection system of the present invention. Further, when a polycarbonate sheet or a polyethylene terephthalate sheet is laminated on the adhesive layer, it becomes more difficult to break down and a further effect can be obtained. If the glass surface on the intermediate layer side of this laminated glass is covered with a conductive film that shields radio waves, there is an effect of preventing damage or deterioration of the film.

  By using the laminated glass, the time required for the intruder to break down is much longer than the plate glass G alone. Also, the thicker the intermediate layer, the more the intermediate layer is composed of a plurality of layers. The thicker the film, the longer it takes to break it.

  For example, in terms of each layer and its thickness, laminated glass of 3 mm / intermediate layer, PVB30 mil (0.76 mm) / sheet glass, and 3 mm laminated structure is a P2A / P2K Has security performance. Sheet glass, 2.5 mm / intermediate layer, PVB60 mil (1.52 mm) / sheet glass, and laminated glass of 2.5 mm have P4A / P3K crime prevention performance according to the standards of the Sheet Glass Association (March 2003). Further, when the laminated glass is used, the interlayer film is hard to break and cannot be easily broken, so that it is difficult to penetrate the laminated glass and crime prevention is improved. By using laminated glass, intruders give up breaking glass, for example, when the window glass is removed together with the sash, etc., the loss of plate glass is detected and the glass break movement detection system of the present invention operates effectively. To do. In addition, since PVB, which is an intermediate layer of laminated glass, generally has ultraviolet absorption performance, laminated glass has an ultraviolet shielding effect, and when used for a window in a house, it suppresses fading of indoor furniture. There is an effect to.

  Moreover, the glass breakage movement detection system of the present invention detects that the window is in an open state and informs that the window has been forgotten to be closed. If the glass movement destruction detection system of the present invention is used for the window of a house and the glass movement destruction detection system of the present invention is used, when the person who aims at illegal intrusion breaks the window glass that shields the electric wave, the glass movement destruction of the present invention The detection system works effectively, and by detecting the breakage of the window glass, it is possible to take measures such as warning the intruder by bell sound and reporting the abnormality to the security company.

  When the glass breakage movement detection system of the present invention is used in an automobile, the radio wave receiver 1 is provided inside the vehicle, the radio wave receiver 3 is provided outside the company, and preferably in a garage storing the automobile. Then, in the garage, it is possible to detect that the door of the automobile is illegally opened, and to take measures such as warning the intruder by a bell sound and reporting the abnormality to the security company.

Example 1
FIG. 2 is a partially enlarged schematic cross-sectional view of the multilayer glass used in Example 1.

  A laminated glass 5 composed of a sheet glass G1 having a thickness of 3 mm, an intermediate layer 4 (PVB, layer thickness 30 mil, ie 0.76 mm), and a sheet glass G2 having a thickness of 3 mm is used. A double-glazed glass shown in FIG. 2 having a size of 500 m × 500 mm having an internal space 6 with an interval of 6 mm and a plate glass G3 with a thickness of 3 mm was prepared. In addition, an electromagnetic shielding film 7 having a laminated structure of ZnO / Ag / ZnO was previously formed on the surface of the plate glass G3 on the inner space side by a sputtering method so that the sheet resistance value was 10Ω / □.

  Next, the insertion loss of MIL-STD-285 (MILITARY STANDARAD 285: Electromagnetic shield room attenuation measurement method used for electromagnetic tests), which is an American standard for the electromagnetic shielding performance of the multilayer glass with respect to radio waves having a frequency of 1 GHz. In accordance with the law, the radio wave attenuation by the multilayer glass was measured.

  One opening was provided in a metal shield box having a width of 1830 mm, a depth of 1200 mm, and a height of 1200 mm, in which the multilayer glass having a size of 500 mm × 500 mm was accommodated. The oscillator 1 was provided at a position 2650 mm away from the opening, and the receiver 2 was provided at a position 210 mm away from the opening into the shield box. When 1 GHz electromagnetic wave was oscillated from the oscillator 1 and the multilayer glass was attached to the opening, the reception intensity of the radio wave was attenuated by 20 dB from the state where there was no multilayer glass before the attachment. The attenuation of 20 dB is sufficient to detect the disappearance of the glass due to the breaking movement of the glass in the glass breaking movement detection system of the present invention.

  Further, the sheet glass G3 coated with the electromagnetic shielding film 7 having the area resistance value of 10Ω / □ having the configuration of ZnO / Ag / ZnO is used as the outdoor side, and the electromagnetic shielding film of the multilayer glass fitted in the opening provided in the box. When only glass G3 coated with 7 was broken with a bar and a hole with a diameter of 200 mm was made, the radio wave reception intensity was attenuated by 15 dB. The attenuation of 15 dB is sufficient to detect the disappearance of the glass due to the breaking movement of the glass in the glass breaking movement detection system of the present invention.

Moreover, the laminated glass which consists of the plate glass G1 of plate | board thickness 3mm, intermediate | middle layer 4 (PVB, layer thickness 30mil, ie 0.76mm), and plate glass G2 of plate | board thickness 3mm which comprises the plate glass of the indoor side which comprises multilayer glass. Since the intermediate film was difficult to break because it was set to 5, it could not be easily broken against breaking by the bar.
Comparative Example MIL-STD, which is an American standard, is not applied to the inner space side of the sheet glass G3 on the outdoor side in the multilayer glass having the structure of Example 1, and the electromagnetic shielding film 7 having a laminated structure of ZnO / Ag / ZnO is not applied. In accordance with the insertion loss method of -285, when the attenuation of the radio wave by the multilayer glass is measured, the multilayer glass cannot shield the radio wave of 1 GHz and can be used for the glass breakage movement detection system of the present invention. Can not.

It is a perspective view for demonstrating the concept of the glass breaking movement detection system of this invention. 1 is a partially enlarged schematic cross-sectional view of a multilayer glass used in Example 1. FIG.

Explanation of symbols

G, G1, G2, G3 Sheet glass 1 Radio wave oscillator 2, 3 Radio wave receiver 4 Intermediate layer 5 Laminated glass 6 Internal space 7 Electromagnetic shielding film

Claims (7)

It consists of a radio wave oscillator, a plate glass that shields the radio wave transmitted by the radio wave oscillating means, and a receiver provided on the opposite side of the radio wave oscillator across the plate glass. A glass breakage movement detection system that detects the disappearance of a plate glass that accompanies movement by means of a change in radio field intensity. A radio wave oscillator, a plate glass that shields the radio wave transmitted by the radio wave oscillation means, and a receiver provided on the radio wave oscillator side with respect to the plate glass, the radio wave intensity of the radio wave reflected by the plate glass at the receiver A glass breakage movement detection system characterized by measuring and detecting the disappearance of the plate glass due to the breakage or movement of the plate glass by a change in radio wave intensity. A radio wave oscillator, a plate glass that shields the radio wave transmitted by the radio wave oscillating means, and a receiver that is provided on both the radio wave oscillator side and the opposite side of the radio wave oscillator with the plate glass interposed therebetween. A glass breakage movement detection system, characterized in that the loss of the plate glass due to the breakage or movement of the plate glass is detected by a change in radio wave intensity. The glass breaking movement detection system according to any one of claims 1 to 3, wherein the plate glass is a plate glass that is provided with a coating for shielding radio waves on a surface thereof to shield radio waves. The glass breaking movement detection system according to any one of claims 1 to 4, wherein the plate glass is a multi-layer glass. The glass breaking movement detection system according to claim 1, wherein the plate glass is tempered glass. The glass breaking movement detection system according to any one of claims 1 to 6, wherein the plate glass is laminated glass.