JP2008293332A - Glass breakage detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass breakage detecting device capable of being installed easily and detecting the presence or absence of a glass breakage highly reliably. <P>SOLUTION: On a window glass 1, a first resonance circuit section 5 is formed with a planar coil pattern 2 which is to be disconnected upon the breakage, and a conductive connection member 3 connected to the planar coil pattern 2. In the center portion of a coil function section 2a of the planar coil pattern 2, a plurality of damping sections 31 which is in a non-connected state with the coil function section 2a, is provided. A second resonance circuit section having a planar coil section and a capacitor is arranged to face the first resonance circuit section 5. A control section monitors electromagnetic coupling states of both resonance circuit sections and detects the presence or absence of a breakage of the window glass 1 on the basis of the electromagnetic coupling states of those resonance circuit sections. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a glass breakage detecting device for detecting breakage of a window glass of a vehicle, for example.

Conventionally, various glass breakage detection devices for detecting breakage of a window glass of a vehicle have been proposed.
As this type of glass breakage detection device, for example, as shown in Patent Document 1, a device that detects the presence or absence of breakage of glass by detecting the presence or absence of disconnection of a resistor disposed on glass has been proposed.
JP 2003-141649 A

  However, in such a conventional glass breakage detection device, it is necessary to electrically connect the resistor disposed on the glass and the detection unit. Therefore, it is necessary to provide such a connection terminal on the glass and to take out a lead wire from the glass frame. Therefore, the installation work of the glass breakage detection device is complicated and the aesthetics are not preferable.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a glass breakage detection device capable of detecting the presence or absence of breakage of glass with high reliability while facilitating installation work. is there.

  In order to solve the above-described problems, in the invention described in claim 1, a planar coil pattern that is formed on a glass surface that is a breakage detection target and is disconnected when the glass is broken, and the planar coil pattern that is electrically connected A first resonance circuit unit comprising a first capacitor function unit connected to the first circuit, a coil unit that is disposed so as to face the planar coil pattern in a non-contact state, and is electromagnetically coupled to the resonance circuit unit, and the coil A second resonance circuit unit comprising a second capacitor function unit electrically connected to the unit and constituting a resonance circuit, and monitoring the electromagnetic coupling state of both resonance circuit units, and breaking the glass based on the electromagnetic coupling state And a damper made of a conductive material that is in a non-connected state with the first resonance circuit portion in the electromagnetic coupling region of both resonance circuit portions on the glass surface. And gist in that a grayed section.

  According to the above configuration, by providing the damping part in the electromagnetic coupling region of both resonance circuit parts, the sharpness (Q) of resonance of the first resonance circuit part is prevented from becoming too steep. Therefore, the resonance sharpness (Q) can be controlled even when the number of turns of the coil of the first resonance circuit unit is increased in order to strengthen the electromagnetic coupling between both resonance circuit units. In addition, since the resonance sharpness can be suppressed by patterning the damping portion on the glass surface, for example, a chip resistor is added to the first resonance circuit portion, or the cross-sectional area of the coil of the first resonance circuit portion is reduced. The sharpness of the resonance can be suppressed more easily and reliably than when measures such as reducing the size are taken.

The gist of the invention described in claim 2 is that, in the glass breakage detection device according to claim 1, the damping portion is provided at a central portion of the planar coil pattern.
According to the above configuration, since the magnetic flux density is high at the central portion of the planar coil pattern when both resonant circuit portions are electromagnetically coupled, the resonance sharpness (Q) is efficiently suppressed by providing a damping portion at such a portion. be able to.

  According to a third aspect of the present invention, in the glass breakage detecting device according to the first or second aspect of the present invention, the frequency variable oscillation means for varying the oscillation frequency for the first resonance circuit unit or the second resonance circuit unit is provided. The breakage detecting means changes the oscillation frequency within a preset range including the resonance frequency of the second resonance circuit unit, and based on a change in electrical characteristics of the resonance circuit unit accompanying the change The gist of the invention is to monitor the electromagnetic coupling state of both resonant circuit parts and detect the presence or absence of breakage of the glass based on the electromagnetic coupling state.

  According to the above configuration, since the change tendency of the electrical characteristics at frequencies near the resonance frequency is greatly different between the state where both resonant circuit parts are electromagnetically coupled and the state where they are not electromagnetically coupled, even if there is a manufacturing error, etc. Even if the resonance frequency of each resonance circuit section is shifted by the above, the breakage detecting means can reliably detect the presence or absence of breakage of the glass based on the change tendency of the electrical characteristics.

  Invention of Claim 4 is a glass breakage detection apparatus as described in any one of Claims 1-3. WHEREIN: The said planar coil pattern adheres a thermosetting conductive resin material to the said glass surface. The gist is that it is configured.

  According to the above configuration, it is possible to easily and reliably form a planar coil pattern that is surely disconnected due to glass breakage. As a result, the presence or absence of breakage of the glass can be detected with high reliability.

  The gist of the invention according to claim 5 is the glass breakage detection device according to any one of claims 1 to 4, wherein the breakage detection object is a window glass for an automobile.

  Generally, the window glass for motor vehicles is comprised so that the whole may be shattered by breakage of one place. For this reason, even if it is a case where a plane coil pattern is arrange | positioned in any site | part of a window glass, a plane coil pattern is disconnected with breakage of this window glass. That is, it is not always necessary to provide a planar coil pattern in the assumed part assuming that the window glass may be damaged. Therefore, the freedom degree of arrangement | positioning in the window glass of a planar coil pattern is raised.

  According to a sixth aspect of the present invention, in the glass breakage detecting device according to the fifth aspect, the window glass is provided so as to be capable of opening and closing with respect to an automobile door, and the planar coil pattern is provided in the window glass. The gist is that it is provided in a portion that is always housed in the door regardless of the open / closed state.

  In the case where an object for detecting breakage of the glass breakage detection device is a window glass for an automobile that can be opened and closed with respect to a door, the planar coil pattern is in an open / closed state of the window glass as shown in the present invention. Regardless of this, it is preferable to form it at a part that is always accommodated inside the door. According to this configuration, since the planar coil pattern is always hidden behind the door, the appearance of the vehicle is good.

The gist of the invention according to claim 7 is the glass breakage detection device according to any one of claims 4 to 6, wherein the thermosetting conductive resin material is a silver paste.
Unlike the case where the planar coil pattern is made of, for example, a wire coil, the planar coil pattern made of silver paste is surely disconnected as the window glass is broken. In particular, by applying the planar coil pattern made of the silver paste of the present invention together with the window glass for an automobile described in claim 5 or claim 6, breakage of the window glass can be reliably detected.

  As described above in detail, according to the present invention, it is possible to detect the presence or absence of glass breakage with high reliability while facilitating installation work.

(First embodiment)
DESCRIPTION OF EMBODIMENTS Hereinafter, a first embodiment in which the present invention is embodied as a glass breakage detection device that detects whether or not a vehicle window glass is broken will be described in detail with reference to FIGS.

  As shown to Fig.1 (a), the planar coil pattern 2 is formed in the downward part in one surface (for example, indoor side surface) of the window glass 1 of a vehicle (automobile). The planar coil pattern 2 is fixed by applying and heating a paste-like thermosetting conductive resin (here, silver paste) to the glass surface of the window glass 1, and is broken when the window glass 1 is broken. It has become. Incidentally, since the glass used as the window glass of the vehicle is configured so that the whole is broken in pieces when one place is broken, the flat coil pattern 2 is always disconnected when the window glass 1 is broken.

  As shown in FIG. 1B, the planar coil pattern 2 includes a coil function part 2a and a pair of electrodes 2b provided at both ends of the coil function part 2a. Then, as shown in FIG. 2A, an elongated conductive connecting member 3 is connected to each electrode 2b. The conductive connection member 3 includes a connection portion 3a and a pair of electrodes 3b provided at both ends of the connection portion 3a. Each electrode 3b has a shape that matches each electrode 2b of the planar coil pattern 2. Yes. Each electrode 3b of the conductive connection member 3 does not necessarily have a shape that coincides with each electrode 2b of the planar coil pattern 2. As shown in FIG. 2B, an adhesive 4a made of a dielectric is interposed between the electrodes 2b and 3b, and the conductive connecting member 3 is attached to the planar coil pattern 2 by the adhesive 4a. Yes. As shown in FIG. 2 (c), the electrodes 2b and 3b and the adhesive 4a constitute the first capacitor function unit 4, and the first capacitor function unit 4 and the coil function of the planar coil pattern 2 are formed. The first resonance circuit unit 5 is configured by the unit 2a. Further, as shown in FIG. 3, the first resonance circuit unit 5 is formed in a portion that is always housed in the door 6 even when the window glass 1 is fully closed.

  On the other hand, as shown in FIGS. 1 and 3, a second resonance circuit unit 7 is disposed at a location facing the first resonance circuit unit 5 in the door 6. The second resonance circuit unit 7 is formed on the printed wiring board 8, and is disposed on the planar coil unit 9 facing the planar coil pattern 2 of the first resonance circuit unit 5 in a non-contact state, and at one end of the planar coil unit 9. And a capacitor 10 as a second capacitor function unit connected thereto. As shown in FIG. 4, the oscillation unit 11 is connected between the end of the planar coil unit 9 on the side opposite to the capacitor 10 and the end of the capacitor 10 on the side opposite to the planar coil unit 9. . A detection unit 12 is connected between a connection point between the planar coil unit 9 and the capacitor 10 and an end of the planar coil unit 9 opposite to the capacitor 10. For this reason, the second resonance circuit unit 7 is a series resonance circuit. The detection unit 12 is connected to a control unit 13 as a breakage detection unit. The glass breakage detection device 14 is configured by the first resonance circuit unit 5, the second resonance circuit unit 7, the oscillation unit 11, the detection unit 12, and the control unit 13.

  The first resonance circuit unit 5 and the second resonance circuit unit 7 are set to the same resonance frequency (resonance frequency fc shown in FIG. 5), and the oscillation frequency of the oscillation unit 11 is set to the resonance frequency fc. For this reason, the second resonance circuit unit 7 and the first resonance circuit unit 5 are in an electromagnetically coupled state at the resonance frequency fc and a frequency in the vicinity thereof.

  The detection unit 12 detects a voltage change accompanying the impedance change of the second resonance circuit unit 7 and outputs the detection signal to the control unit 13. Since the second resonance circuit unit 7 is a series resonance circuit, as shown in FIG. 5A, the impedance Z of the second resonance circuit unit 7 is minimized at the resonance frequency fc, and the detection voltage V is maximized. However, in a state where the first resonance circuit unit 5 is located at a position facing the second resonance circuit unit 7 (fully closed state of the window glass 1), the first resonance circuit unit 5 is in the second resonance circuit unit 7. Since the first resonance circuit section 5 is a parallel resonance circuit, the impedance Z at the resonance frequency fc is high as shown in FIG. 5B. Further, in a state where the first resonance circuit unit 5 is not located at a position facing the second resonance circuit unit 7 (open state of the window glass 1) or in a disconnected state of the first resonance circuit unit 5, Since the first resonance circuit unit 5 is not electromagnetically coupled to the second resonance circuit unit 7, the impedance Z at the resonance frequency fc is low as shown in FIG. Therefore, the detection voltage V is low in the electromagnetic coupling state and is high in the non-electromagnetic coupling state.

  The control unit 13 determines whether or not the window glass 1 is broken based on the detection signal from the detection unit 12. Specifically, as shown in FIGS. 5B and 5C, a preset voltage threshold Vth is recorded in the control unit 13, and the control unit 13 monitors a voltage change at the resonance frequency fc. . When the window glass 1 is not damaged, the first resonance circuit unit 5 and the second resonance circuit unit 7 are electromagnetically coupled, and therefore, at the resonance frequency fc as shown in FIG. The detection voltage V is lower than the voltage threshold Vth. However, when the window glass 1 is broken and the planar coil pattern 2 of the first resonance circuit unit 5 is disconnected, the first resonance circuit unit 5 and the second resonance circuit unit 7 are not electromagnetically coupled. As shown, the detection voltage V at the resonance frequency fc is higher than the voltage threshold Vth. Then, the control unit 13 determines whether or not the window glass 1 is damaged based on whether or not the voltage value detected by the detection unit 12 is higher than the voltage threshold Vth, and determines that the window glass 1 is damaged. In this case, a control signal is output to a preset control target. Specifically, the control unit 13 outputs an operation control signal to, for example, a notification device as a control target, and when the breakage of the window glass 1 is detected, activates the notification device to notify the breakage of the window glass 1. For example.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) When the window glass 1 is in a non-damaged state, the two resonance circuit portions 5 and 7 are electromagnetically coupled, but when the window glass 1 is in a broken state, the planar coil pattern 2 of the first resonance circuit portion 5 is disconnected. Therefore, the resonance circuit portions 5 and 7 are not electromagnetically coupled. When both the resonance circuit portions 5 and 7 are not in a state of being electromagnetically coupled, a large change occurs in the impedance Z of the entire circuit at the resonance frequency fc. For this reason, the control part 13 can detect the presence or absence of the breakage of the window glass 1 by detecting the change of the detection voltage V based on the change of the impedance Z. And since it is not necessary to connect the circuit by the side of the control part 13 and the 1st resonance circuit part 5 using a lead wire, it applies easily also to movable glass like the window glass 1 for vehicles as a breakage detection object. be able to. The installation work of the glass breakage detector 14 can be facilitated.

  Further, by using the two resonance circuit portions 5 and 7, it is possible to ensure a large variation width of the impedance Z between the electromagnetic coupling state and the non-electromagnetic coupling state, that is, a variation width of the detection voltage V. 1 can be reliably detected. Incidentally, when the primary side (the second resonance circuit unit 7 side) is not a resonance circuit, for example, it is configured only by a coil unit, the electromagnetic coupling force with the first resonance circuit unit 5 is reduced, so that the electromagnetic coupling The change width of the impedance Z between the state and the non-electromagnetic coupling state becomes small. Therefore, the detection accuracy is low, and inconveniences such as the need for setting the printed wiring board 8 (planar coil section 9) with respect to the first resonance circuit section 5 severely occur.

  In addition, since the electrical connection using the lead wire or the like with the first resonance circuit unit 5 is not required, the presence or absence of breakage can be detected with high reliability even in the movable glass such as the window glass 1.

  Furthermore, since the conductive connecting member 3 can be connected to the electrodes 2b provided at both ends of the planar coil pattern 2 to function as the first capacitor function unit 4, the first resonance circuit unit 5 can be configured. Mounting components such as chip capacitors can be eliminated. Therefore, the 1st resonance circuit part 5 can be formed thinly, and the protrusion amount of the 1st resonance circuit part 5 from the window glass 1 can be reduced. For this reason, for example, when the first resonance circuit unit 5 is waterproof protected with an insulating film or the like, the waterproof property can be secured.

  (2) The 1st capacitor | condenser functional part 4 can be comprised only by sticking each electrode 3b of the electroconductive connection member 3 to each electrode 2b of the planar coil pattern 2 with the adhesive agent 4a. For this reason, the 1st resonance circuit part 5 can be formed simply and easily.

  (3) The first resonant circuit unit 5 is configured by a parallel resonant circuit, and the second resonant circuit unit 7 is configured by a series resonant circuit. For this reason, since the impedance Z of the first resonance circuit unit 5 is minimized when the second resonance circuit unit 7 oscillates at the resonance frequency fc of both the resonance circuit units 5 and 7, In addition to the strong electromagnetic coupling, the impedance Z of the entire circuit is increased by the influence of the first resonance circuit unit 5 in the electromagnetic coupling state. Therefore, when the electromagnetic coupling between the two resonance circuit portions 5 and 7 is lost due to the breakage of the window glass 1, the change in the impedance Z appears remarkably. Therefore, the control part 13 can detect the change of the detection voltage V accompanying the change of this impedance Z reliably, and can detect the presence or absence of the damage of the window glass 1 with high precision.

  (4) The planar coil pattern 2 was configured by fixing a thermosetting conductive resin material to the glass surface of the window glass 1. For this reason, it is possible to easily and reliably form the planar coil pattern 2 that is surely disconnected by the breakage of the window glass 1. As a result, the presence or absence of breakage of the glass can be detected with high reliability.

  (5) The glass breakage detector 14 detects whether or not the window glass 1 for automobiles provided to be capable of opening and closing the door 6 is broken. Generally, the window glass 1 for automobiles, in particular, the side glass and the rear glass is configured so that the whole is broken in pieces at one place. For this reason, even if the planar coil pattern 2 (more precisely, the first resonance circuit unit 5) is disposed in any part of the window glass 1, the planar coil pattern 2 is disconnected due to breakage of the window glass 1. . That is, it is not always necessary to provide the planar coil pattern 2 in the assumed portion assuming a portion where the window glass 1 may be broken. Therefore, the freedom degree of arrangement | positioning in the window glass 1 of the planar coil pattern 2 is raised.

  (6) When the breakage detection target of the glass breakage detection device 14 is the window glass 1 for an automobile that can be opened and closed with respect to the door 6, the planar coil pattern 2 is in an open / closed state of the window glass 1. Regardless of this, it is preferable to form it at a part that is always accommodated inside the door 6. In this way, the planar coil pattern 2 (more precisely, the first resonance circuit section 5) is always hidden behind the door 6, so that the appearance of the vehicle is good.

  (7) As the thermosetting conductive resin material constituting the planar coil pattern 2, a silver paste having a fragility that is surely disconnected when the window glass 1 is broken is employed. For this reason, unlike the case where the planar coil pattern 2 of the first resonance circuit unit 5 is a wire coil, for example, the wire breakage of the window glass 1 is surely broken. In particular, by applying the planar coil pattern 2 made of silver paste together with the window glass 1 for automobiles, breakage of the window glass 1 can be reliably detected.

(Second Embodiment)
Next, a second embodiment embodying the present invention will be described with reference to FIGS. In the following embodiments, differences from the first embodiment will be mainly described, and common points will be simply denoted by the same member numbers, and description thereof will be omitted.

  In the present embodiment, the configuration of the first resonance circuit unit 5 is different from that of the first embodiment. Specifically, as shown in FIGS. 6A and 6B, the planar coil pattern 2 is formed on the glass surface of the window glass 1 as in the first embodiment. The conductive connection member 3 is printed on the flexible printed circuit board 21. The connecting portion 3 a of the conductive connecting member 3 is formed in a planar coil shape, and is an additional coil pattern that is disposed opposite to the coil function portion 2 a of the planar coil pattern 2. For this reason, as shown in FIG. 7, the first resonance circuit unit 5 includes a coil including both the coil function unit 2 a and the conductive connection member 3.

Therefore, according to this embodiment, in addition to the effects described in the above (1) to (7) in the first embodiment, the following effects can be obtained.
(8) A large number of coil turns of the first resonance circuit unit 5 can be secured in a small area, and the capacitance of the first capacitor function unit 4 can be reduced. For this reason, the connection area of the electrode 2b of the planar coil pattern 2 and the electrode 3b of the electroconductive connection member 3 can be made small, and the required area of the 1st resonance circuit part 5 in a glass surface can be made small.

(Third embodiment)
Next, a third embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 8, the conductive connection member 3 is mounted on the printed wiring board 8 on which the second resonance circuit unit 7 is mounted so that the electrodes 3 b face the electrodes 2 b of the planar coil pattern 2. Yes. In the printed wiring board 8, a dielectric (not shown) is laminated on the surface of each electrode 3 b of the conductive connection member 3 facing the planar coil pattern 2, and the dielectric is slid on each electrode of the planar coil pattern 2. It arrange | positions in the door 6 so that it may contact (contact) or adjoin.

  For this reason, although the conductive connection member 3 is not provided on the window glass 1, as shown in FIG. 9, the first capacitor function unit 4 is configured by the electrodes 2b and 3b and the dielectric interposed therebetween. It becomes a state.

Therefore, according to this embodiment, in addition to the effects described in the above (1) to (7) in the first embodiment, the following effects can be obtained.
(9) Since the conductive connection member 3 is mounted on the printed wiring board 8 together with the second resonance circuit unit 7 and is configured separately from the planar coil pattern 2, the planar coil pattern is formed on the glass surface of the window glass 1. Only two need be formed. Therefore, the number of component mounting points on the window glass 1 can be reduced, and the manufacturing process can be simplified as compared with the case where the conductive connection member 3 is mounted on the glass surface.

(Fourth embodiment)
Next, a fourth embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 10, the planar coil pattern 2 is formed on the glass surface of the window glass 1 as in the first embodiment, and the coil function unit 2 a is configured as a disconnection detection wiring pattern. The conductive connection member 3 is printed on the flexible printed circuit board 21 as in the second embodiment. The connecting portion 3 a of the conductive connecting member 3 is formed in a planar coil shape, and is an additional coil pattern that is disposed opposite to the coil function portion 2 a of the planar coil pattern 2.

  In addition, on the path of the connection portion 3a of the conductive connection member 3, electrically disconnected connection terminals 3c and 3d are formed. In the vicinity of the connection terminals 3c and 3d, a sheet-like capacitor unit 25 is formed by laminating the first electrode 22, the conductor 23, and the second electrode 24 on the flexible printed circuit board 21 in this order. The capacitor unit 25 constitutes a first capacitor function unit. The first electrode 22 is connected to the connection terminal 3c of the connection portion 3a, and the second electrode 24 is connected to the connection terminal 3d. That is, in the present embodiment, as shown in FIG. 11, the first resonance circuit portion 5 is configured by the coil function portion 2 a of the planar coil pattern 2, the connection portion 3 a of the conductive connection member 3, and the sheet-like capacitor portion 25. Has been.

  Since the sheet-like capacitor unit 25 is a sheet-like material laminated and formed on the flexible printed circuit board 21, the electrostatic capacity can be adjusted by cutting a part of the sheet-like capacitor part 25, and functions as a variable capacitor. Specifically, for example, if a part of the sheet-like capacitor portion 25 is cut as shown by a broken line H in FIG. 12, the facing area of the electrodes 22 and 24 can be reduced, so that the capacitance can be finely adjusted. Is possible. For example, as shown in FIG. 13, even if the cutout hole 26 is provided in the sheet-like capacitor unit 25, the capacitance of the sheet-like capacitor unit 25 can be finely adjusted. Therefore, the resonance frequency fc of the first resonance circuit unit 5 can be finely adjusted by cutting the sheet-like capacitor unit 25.

  In the present embodiment, the planar coil pattern 2 is formed on the glass surface of the window glass 1 in the same manner as in each of the embodiments described above, and the coil function portion 2a of the planar coil pattern 2 is used as a disconnection detection wiring pattern. However, when the planar coil is formed by the connection portion 3a of the conductive connection member 3, the disconnection detection wiring pattern does not necessarily have to be configured by the coil function portion 2a. That is, it is only necessary to form a pattern on the glass surface that is electrically connected between the electrodes 3 b of the conductive connection member 3 and that is always disconnected when the window glass 1 is broken. On the other hand, when the coil function part 2a is formed in the glass surface, the connection part 3a of the electroconductive connection member 3 does not necessarily need to be formed in planar coil shape.

  Each electrode 2b of the planar coil pattern 2 and each electrode 3b of the conductive connection member 3 are connected via the adhesive 4a as in the first and third embodiments, and function as the first capacitor function unit 4. Alternatively, the electrodes 2b and 3b may be connected in a conductive state.

Therefore, according to this embodiment, in addition to the effects described in the above (1) to (7) in the first embodiment, the following effects can be obtained.
(10) Since the first capacitor function unit is configured by the sheet-like capacitor unit 25 formed on the flexible printed circuit board, by cutting the sheet-like capacitor unit 25, the first capacitor function unit Capacitance can be easily adjusted. Therefore, fine adjustment of the resonance frequency of the first resonance circuit unit 5 can be easily performed.

(Fifth embodiment)
Next, a fifth embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 14, the planar coil pattern 2 is formed on the glass surface of the window glass 1 as in the first embodiment, and the conductive connection member 3 is connected to both ends of the planar coil pattern 2. A first resonance circuit unit 5 is formed. In addition, a plurality of damping portions 31 that are not connected to the coil function portion 2a are formed at the central portion of the coil function portion 2a of the planar coil pattern 2 on the glass surface. In the present embodiment, the damping part 31 has a quadrangular shape, and is composed of a paste-like thermosetting conductive resin that is fixed by being applied and heated to the glass surface together with the planar coil pattern 2.

  When the damping part 31 is formed in this way, in the electromagnetic coupling state between the second resonance circuit part 7 and the first resonance circuit part 5, each damping part 31 is formed in the electromagnetic coupling region, so that the resistance As shown in FIG. 15, the resistance component R is inserted into the first resonance circuit unit 5. That is, the first resonance circuit unit 5 is configured by the coil function unit 2a of the planar coil pattern 2, the first capacitor function unit 4, and the resistance component R. For this reason, the sharpness (Q) of resonance becomes dull due to this resistance R, and the change in impedance Z at the resonance frequency fc shown in FIG.

  The damping part 31 does not necessarily have to be formed at the central portion of the planar coil pattern 2, and may be formed in the electromagnetic coupling region between the first resonance circuit part 5 and the second resonance circuit part 7. . That is, the damping part 31 may be formed outside the planar coil pattern 2, for example. Moreover, the damping part 31 does not necessarily need to be provided with two or more, and a shape is not limited to square shape. For example, the damping unit 31 may be configured in a loop shape.

Therefore, according to this embodiment, in addition to the effects described in the above (1) to (7) in the first embodiment, the following effects can be obtained.
(11) Since the damping part is provided in the electromagnetic coupling region of both the resonance circuit parts 5 and 7, it is possible to prevent the resonance sharpness (Q) of the first resonance circuit part 5 from becoming too steep. . Therefore, even when the number of turns of the coil function unit 2a of the first resonance circuit unit 5 is increased in order to strengthen the electromagnetic coupling between the resonance circuit units 5 and 7, the sharpness (Q) of resonance can be controlled. Further, since the resonance sharpness (Q) can be suppressed by patterning the damping part 31 on the glass surface, for example, a chip resistor is added to the first resonance circuit part 5 or the coil function part 2a is disconnected. The sharpness of the resonance can be suppressed more easily and reliably than when measures such as reducing the area are taken.

  (12) Each damping part 31 is provided at the central part of the coil function part 2 a of the planar coil pattern 2. Since the magnetic flux density is high at the central portion of the coil function portion 2a during electromagnetic coupling, the sharpness (Q) of resonance can be efficiently suppressed by providing the damping portion 31 at such a portion.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 16, in the glass breakage detection device 14 of the present embodiment, the oscillation unit 11 is changed to a frequency variable oscillation unit 32 as frequency variable oscillation means, and the frequency variable oscillation unit 32 is controlled by the control unit 13. This is different from the above embodiments in that the oscillation frequency is controlled.

  Specifically, the variable frequency oscillation unit 32 is configured to be able to oscillate at a plurality of types of frequencies including the resonance frequency fc of both the resonance circuit units 5 and 7, and the oscillation frequency is changed based on a control signal from the control unit 13. .

  When monitoring whether the window glass 1 is broken or not, as shown in FIG. 17, the control unit 13 starts the search end frequency fs set lower than the resonance frequency fc and ends the search higher than the resonance frequency fc. In the frequency band up to the frequency fe, a control signal for changing to a plurality of frequencies including the resonance frequency fc is output to the frequency variable oscillator 32. And the control part 13 judges the presence or absence of the damage of the window glass 1 based on the change tendency of the detection voltage V in those frequencies.

  Specifically, when the window glass 1 is not damaged, as shown in FIG. 17, the detection voltage V decreases as the frequency approaches the resonance frequency fc, and increases as the distance increases. Therefore, the control unit 13 recognizes a voltage value that changes from “high → low → high” when the oscillation frequency is changed in order from the search start frequency fs to the search end frequency fe. For example, as shown by a one-dot chain line and a two-dot chain line in the figure, it is assumed that the resonance frequency fc is shifted to an error frequency fcα, fcβ, etc. due to an error in manufacturing the resonance circuit portions 5 and 7. Similarly, “High → Low → High”.

  On the other hand, when the window glass 1 is broken, as shown in FIG. 5C, the detection voltage V is highest at the resonance frequency fc, and is lower as it is farther from the resonance frequency fc. Therefore, the control unit 13 changes the oscillation frequency from the search start frequency fs to the search end frequency fe in order, “low → high → low”, or “high” when the search range is set narrower. Recognizes the voltage value that changes as “→ High → High”.

Therefore, the control unit 13 can reliably recognize the presence or absence of breakage of the window glass 1 without monitoring the voltage value change tendency without using the voltage threshold value Vth as a reference.
Therefore, according to this embodiment, in addition to the effects described in the above (1) to (7) in the first embodiment, the following effects can be obtained.

  (13) Since the change tendency of the electrical characteristics at a frequency near the resonance frequency fc is greatly different between the state where both the resonance circuit portions 5 and 7 are electromagnetically coupled and the state where they are not electromagnetically coupled. Even if the resonance frequency fc of each of the resonance circuit units 5 and 7 is shifted due to an error or the like, the control unit 13 can reliably detect whether or not the glass is broken based on the change tendency of the electrical characteristics. .

In addition, you may change embodiment of this invention as follows.
-You may combine the said each embodiment arbitrarily. For example, the configuration of the variable frequency oscillating unit 32 in the sixth embodiment and the determination of the presence or absence of damage by the control unit 13 are applied to the first to fifth embodiments, or the configuration of the damping unit 31 in the fifth embodiment is first to first. It may be applied to the fourth and sixth embodiments.

-The 2nd resonance circuit part 7 does not necessarily need to be a series resonance circuit, and may be comprised by the parallel resonance circuit.
-The surface of the first resonance circuit unit 5 may be subjected to a protection process such as covering with an insulating film.

  The flat coil pattern 2 formed on the glass surface of the window glass 1 does not necessarily need to be made of a thermosetting conductive resin material, and has a vulnerability to be surely disconnected when the window glass 1 is broken. What is necessary is just to be comprised with the electroconductive material.

-The coil part (planar coil part 9) which comprises the 2nd resonance circuit part 7 does not necessarily need to have comprised the planar shape.
The glass breakage detection device 14 is not necessarily applied as a breakage detection device for the window glass 1 of the vehicle, and may be applied as a breakage detection device for a window glass of a house, for example. The glass breakage detection device 14 is not necessarily applied as a breakage detection device for movable glass, and may be applied as a breakage detection device for fixed glass.

(A) is a perspective view which shows roughly the arrangement | positioning state of the glass breakage detection apparatus of 1st Embodiment of this invention, (b) is the partially expanded view of (a). (A) is a front view showing a schematic configuration of the first resonance circuit section of the first embodiment, (b) is a cross-sectional view taken along line AA of (a), and (c) is an equivalent circuit of the first resonance circuit section. FIG. Sectional drawing which shows roughly the installation state of the glass breakage detection apparatus of the embodiment. The circuit diagram which shows roughly the electrical structure of the glass breakage detection apparatus of the embodiment. (A)-(c) is a graph which shows the detection waveform characteristic of the glass breakage detection apparatus of the embodiment. (A) is a perspective view which shows roughly the arrangement | positioning state of the glass breakage detection apparatus of 2nd Embodiment of this invention, (b) is the partially expanded view of (a). The circuit diagram which shows the equivalent circuit of the 1st resonance circuit part of the embodiment. The perspective view which shows roughly the arrangement | positioning state of the glass breakage detection apparatus of 3rd Embodiment of this invention. The circuit diagram which shows roughly the electrical structure of the glass breakage detection apparatus of the embodiment. The perspective view which shows roughly the arrangement | positioning state of the glass breakage detection apparatus of 4th Embodiment of this invention. The circuit diagram which shows the equivalent circuit of the 1st resonance circuit part of the embodiment. The front view which shows the example of a cutting process of the 1st resonance circuit part of the embodiment. The front view which shows the example of a cutting process of the 1st resonance circuit part of the embodiment. The front view which shows schematic structure of the 1st resonance circuit part of 5th Embodiment of this invention. The circuit diagram which shows the equivalent circuit of the 1st resonance circuit part of the embodiment. The circuit diagram which shows roughly the electrical constitution of the glass breakage detection apparatus of 6th Embodiment of this invention. The graph which shows the detection waveform characteristic of the glass breakage detection apparatus of the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Window glass, 2 ... Planar coil pattern, 2a ... Coil function part, 2b ... Electrode, 3 ... Conductive connection member, 3a ... Connection part, 3b ... Electrode, 4 ... 1st capacitor | condenser function part, 4a ... Adhesive, DESCRIPTION OF SYMBOLS 5 ... 1st resonance circuit part, 7 ... 2nd resonance circuit part, 9 ... Planar coil part, 10 ... Capacitor, 11 ... Oscillation part, 12 ... Detection part, 13 ... Control part as breakage detection means, 14 ... Glass breakage Detection device, 21 ... flexible printed circuit board, 22 ... first electrode, 23 ... dielectric, 24 ... second electrode, 25 ... sheet capacitor part, 31 ... damping part, 32 ... variable frequency oscillation part.

Claims (7)

A planar coil pattern that is formed on the glass surface that is the object of breakage detection and that is disconnected when the glass breaks, and a first capacitor function unit that is electrically connected to the planar coil pattern and forms a resonance circuit. 1 resonant circuit section;
A second resonance provided with a coil portion that is disposed to face the planar coil pattern in a non-contact state and electromagnetically couples with a resonance circuit portion, and a second capacitor function portion that is electrically connected to the coil portion and constitutes a resonance circuit. A circuit section;
The electromagnetic coupling state of both resonant circuit parts is monitored, and provided with a breakage detecting means for detecting the presence or absence of breakage of the glass based on the electromagnetic coupling state,
A glass breakage detection device, wherein a damping portion made of a conductive material that is in a non-connected state with the first resonance circuit portion is provided in an electromagnetic coupling region of both resonance circuit portions on the glass surface.   The glass breakage detection device according to claim 1, wherein the damping portion is provided at a central portion of the planar coil pattern. A variable frequency oscillation means for varying an oscillation frequency for the first resonance circuit unit or the second resonance circuit unit;
The breakage detection means changes the oscillation frequency within a preset range including the resonance frequency of the second resonance circuit unit, and performs both resonances based on a change in electrical characteristics of the resonance circuit unit due to the change. The glass breakage detection device according to claim 1 or 2, wherein the glass coupling state of the circuit unit is monitored and the presence or absence of breakage of the glass is detected based on the electromagnetic coupling state. In the glass breakage detection device according to any one of claims 1 to 3,
The said flat coil pattern is a glass breakage detection apparatus comprised by adhering a thermosetting conductive resin material to the said glass surface. In the glass breakage detection device according to any one of claims 1 to 4,
The breakage detection target is a glass breakage detection device that is a window glass for automobiles. In the glass breakage detection device according to claim 5,
The window glass is provided so that it can be opened and closed with respect to the door of the automobile,
The said flat coil pattern is a glass breakage detection apparatus provided in the site | part which will always be accommodated in the inside of a door irrespective of the opening / closing state in the said window glass. In the glass breakage detection device according to any one of claims 4 to 6,
The said thermosetting conductive resin material is a glass breakage detection apparatus which is a silver paste.

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