JP2010139272A - Open/close type window glass damage detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an open/close type window glass damage detector capable of detecting damage to window glass by efficiently applying a counter magnetic field to a magnetic switch. <P>SOLUTION: A magnet 50 is provided in window glass capable of freely opening or closing the opening of a vehicle to generate a fixed magnetic field. Coils 67a, 67b for generating counter magnetic fields are connected to a magnetic field turned on by the magnetic field of the magnet 50, and generate a counter magnetic field for canceling the magnetic field of the magnet 50 following the on of the magnetic switch to turn of the magnetic switch. The damage to the window glass is detected on the basis of a switching period of the magnetic switch. The coils 67a, 67b for generating a counter magnetic field are wound around cores 62a, 62b made of a magnetic material magnetically coupled to the magnetic switch. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an open / close-type window glass breakage detection apparatus.

  Conventionally, Patent Document 1 and Patent Document 2 have been proposed. According to Patent Document 1, a reed switch, a magnet that causes the reed switch to perform a switching operation by being relatively approached and separated from the reed switch, and a reed switch are disposed near the reed switch, A security switch comprising a coil that is appropriately fed to form a magnetic field that cancels the magnetic field applied to the reed switch from the magnet in order to inspect the switching operation of the reed switch in a state where the magnet is in proximity to the reed switch. Has been proposed. A coil is wound around the reed switch.

  According to Patent Document 2, at least one normally open type reed switch is set inside an electromagnetic coil wound in a cylindrical shape, and when the reed switch is closed, the electromagnetic coil is energized and generated from the electromagnetic coil. There has been proposed a configuration in which the reed switch is self-held by a magnetic field.

However, there are problems that the distance from the magnet cannot be measured with a simple structure and that the system cannot be made inexpensive simply by using the above proposal. Further, according to Patent Document 3, an apparatus for detecting breakage of a window glass of a vehicle has been proposed to prevent theft. This type of apparatus detects the breakage of the window glass by detecting the position (presence) of the window glass under the condition that the window glass is in the fully closed position.
Japanese Utility Model Publication No. 03-48831 Japanese Utility Model Publication No. 61-190642 JP 11-321564 A

  A magnet is fixed to the window glass, the magnetic switch is turned on by the magnetic field of the magnet, and the magnetic switch is turned off by generating a reverse magnetic field that cancels the magnetic field of the magnet when the magnetic switch is turned on. Based on the switching period of the magnetic switch It is conceivable to detect the fall of the magnet due to the breakage of the window glass. In this case, when the magnet is at the minimum magnetic force position, it is necessary to turn on the magnetic switch by setting the magnetic flux at the magnetic switch position to a predetermined value or more, and when the magnet is at the maximum magnetic force position, It is necessary to cancel the magnetic flux at the position and turn off the magnetic switch. In order to turn off the magnetic switch, a strong reverse magnetic field reverse to that of the magnet is required. That is, it is necessary to increase the magnetic field of the magnet when the magnet is dropped, and a strong reverse magnetic field is required before the magnet is dropped.

  The present invention has been made under such a background. The purpose of the present invention is to break the openable window glass that can detect the breakage of the window glass by efficiently applying a reverse magnetic field to the magnetic switch. It is to provide a detection device.

  In the invention according to claim 1, the opening of the vehicle is provided in a window glass that can be opened and closed, and is connected to the magnet that generates a constant magnetic field, a magnetic switch that is turned on by the magnetic field of the magnet, and the magnetic switch, A reverse magnetic field generating coil that turns off the magnetic switch by generating a reverse magnetic field that cancels the magnetic field of the magnet when the magnetic switch is turned on, and the magnet that breaks the window glass based on the switching period of the magnetic switch And a core member made of a magnetic material and magnetically coupled to the magnetic switch and wound with the reverse magnetic field generating coil.

  According to the first aspect of the present invention, when the magnetic switch is turned on by the magnetic field of the magnet provided on the window glass that can open and close the vehicle opening, a reverse magnetic field that cancels the magnetic field of the magnet is generated in the reverse magnetic field generating coil. The magnetic switch is turned off. Based on the switching period of the magnetic switch, the judging means detects the fall of the magnet due to the breakage of the window glass.

  Here, the reverse magnetic field generating coil is wound around a core made of a magnetic material that is magnetically coupled to the magnetic switch, whereby a reverse magnetic field can be efficiently applied to the magnetic switch.

As described in claim 2, in the open / close-type window glass breakage detecting device according to claim 1, the core material may be made of a high permeability material.
As described in claim 3, in the open / close-type window glass breakage detecting device according to claim 1 or 2, the magnet may be fixed to a clip that sandwiches the window glass at an end portion of the window glass. .

  As described in claim 4, in the opening / closing type window glass breakage detecting device according to claim 3, the clips may be urged in directions approaching each other at positions shifted in the plane of the window glass. .

  According to the present invention, it is possible to efficiently detect a window glass by applying a reverse magnetic field to a magnetic switch.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of a right front door of a passenger car, and FIG. 2 is a schematic front view of the right front door of the passenger car.

  As shown in FIG. 1, the vehicle door 1 includes an outer panel 2 and an inner panel 3. A window glass 5 made of tempered glass is disposed between the outer panel 2 and the inner panel 3. The thickness of the window glass 5 is about 3.1 mm to 5.0 mm. A door trim is attached to the inner side of the inner panel 3 of the vehicle door 1.

  A window regulator 10 that moves up and down the window glass 5 is housed inside the vehicle door 1. In the present embodiment, an X-arm type window regulator is used as the window regulator 10. The inner panel 3 is provided with a door part assembly hole 3a, and a modular panel 6 is provided so as to close the door part assembly hole 3a.

  The X arm type window regulator 10 is supported on the outdoor surface of the modular panel 6 via a base plate (fixed base) 11. That is, the shaft 13 of the lift arm 12 of the X arm type window regulator 10 is supported on the base plate 11 fixed to the outdoor surface of the modular panel 6. An electric drive unit 14 is fixed to the base plate 11. As shown in FIG. 2, the lift arm 12 integrally has a sector gear (driven gear) 15 centered on a shaft 13, and the electric drive unit 14 of FIG. 1 is engaged with the pinion 16 (FIG. 2). And its drive motor (not shown).

  In FIG. 2, the intermediate portion of the equalizer arm 18 is pivotally attached to the intermediate portion in the length direction of the lift arm 12 by a shaft 17. Guide pieces (rollers) 19 and 20 are pivotally attached to the upper end portions (tip portions) of the lift arm 12 and the equalizer arm 18 so as to be rotatable and tiltable, respectively. Roller) 21 is pivotally attached.

  The guide piece 19 of the lift arm 12 and the guide piece 20 of the equalizer arm 18 are movably fitted to the window glass bracket 22, and the guide piece 21 of the equalizer arm 18 is located on the outside of the modular panel 6 in FIG. It is movably guided to an equalizer arm bracket (posture maintenance rail) 23 fixed to the surface.

  On the other hand, a window glass holder 24 is fixed to the lower edge of the window glass 5 at the front and rear thereof. The window glass holder 24 is fixed to the lower edge of the window glass 5 in advance, and the window glass 5 having the window glass holder 24 is inserted from the gap between the outer panel 2 and the inner panel 3, and the window glass bracket 22 is tightened by bolts 25. It is fixed to.

  As shown in FIG. 2, a pair of front and rear glass runs 26 are erected. The glass run 26 is made of a rubber material. The window glass 5 is movably supported by a pair of front and rear glass runs 26 as rail members. That is, the front and rear end portions of the window glass 5 are guided by the glass run 26 and can move up and down.

  When the pinion 16 is driven forward and backward via the electric drive unit 14 of FIG. 1, the lift arm 12 swings about the shaft 13 via the sector gear 15, and as a result, the window glass bracket 22 (window glass 5) is moved. The equalizer arm 18, the guide pieces 19, 20, 21 and the equalizer arm bracket 23 are moved up and down while being held in a substantially horizontal state. Thus, the window glass 5 is raised and lowered, and the opening 4 of the vehicle can be freely opened and closed by the window glass 5.

  A longitudinal section taken along line AA in FIG. 2 is shown in FIG. In FIG. 3, a breakage detection device 30 for an openable window glass for preventing unauthorized entry is disposed inside the vehicle door 1. The breakage detection device 30 includes a clip 40, a magnet 50, a detection unit 60, a determination unit 70, and an alarm unit 80.

  FIG. 4 is a perspective view of the breakage detection device 30 for the openable window glass. FIGS. 5A and 5B show the breakage detection device 30 for the openable window glass, FIG. 5A is a front view, and FIG. 5B is a longitudinal sectional view taken along line AA in FIG. FIG. 6 is a plan view (a view of arrow B) of FIG.

  In FIG. 3, the window glass 5 is disposed between the outer panel 2 and the inner panel 3 in a state of being sealed by a weather strip 7. A door trim 8 is disposed inside the inner panel 3. The clip 40 is disposed at the lower end of the window glass 5 and sandwiches the window glass 5.

  As shown in FIG. 5, the clip 40 is configured by bending a single plate spring steel plate. The clip 40 includes first and second members 41 and 42 and a bent portion (connecting portion) 43 that face each other. The first member 41 on the back side has a rectangular shape, and the second member 42 on the front side has a square shape that is narrower than the first member 41. The window glass 5 is disposed between the first member 41 on the back side and the second member 42 on the front side, and the first member 41 and the second member 42 are urged toward the window glass 5 toward each other. .

  The bent portion 43 connects the first member 41 and the second member 42. The bent portion 43 is bent in two steps, and the width of the second-stage bent portion 43b is narrower than the thickness of the window glass 5, and the end surface of the window glass 5 is in contact with the bent portion 43a of the first step.

  In FIG. 5, a rectangular through hole 44 is formed at the center of the first member 41. The second member 42 is located at a position corresponding to the through hole 44. The second member 42 is located at a location corresponding to the inside of the through hole 44 of the first member 41 as shown in FIG. 5A, and the other surface (surface 5a) as shown in FIG. 5B. ). The second member 42 is bonded to the window glass 5.

  Thus, in a state where the first member 41 and the second member 42 are in contact with each other at a position shifted in the plane of the window glass 5 between the first member 41 and the second member 42 where the window glass 5 is disposed. It is biased in the direction of approaching each other. That is, force is applied to the window glass 5 at different locations on the front surface 5a and the back surface 5b of the window glass 5. Further, the clip 40 clamps (holds) the lower end portion of the window glass 5 with a predetermined force or more.

  As shown in FIGS. 4 and 5, a magnet (permanent magnet) 50 is fixed to the front side of the second member 42 of the clip 40. In this embodiment, a ferrite magnet is used as the magnet 50. As shown in FIG. 4, the magnet 50 is magnetized with the left half being an N pole and the right half being an S pole. As shown in FIG. 6, the magnet 50 as the magnetic field generating unit generates a constant magnetic field H1.

  As shown in FIG. 3, the detection unit 60 is fixed to the inner panel 3. Here, the vertical direction is the X direction and the horizontal direction is the Y direction. The clip 40 moves in the X direction (vertical direction), that is, falls.

  As shown in FIG. 4, the detection unit 60 includes an MR sensor (magnetoresistive element) 61 and L-shaped cores (cores) 62 a and 62 b disposed on the left and right sides of the MR sensor 61. The MR sensor 61 is disposed at the same height as the magnet 50 when the window glass 5 is fully closed (disposed from the magnet 50 by a predetermined distance in the Y direction).

FIG. 7 shows an electrical configuration of the breakage detection device 30 for the openable window glass.
The breakage detection device 30 for the openable / closable window glass includes a magnet 50, a detection unit 60, and a determination unit 70 as a determination unit. The detection unit 60 includes a magnetic switch 63 and a reverse magnetic field generation unit 64.

  The magnetic switch 63 includes an MR sensor 61 (magnetoresistive element) and an NPN transistor 65 as a switching element. The reverse magnetic field generator 64 includes a resistor 66, two coils 67 a and 67 b, and a capacitor 68.

  One end of the MR sensor 61 is connected to the determination unit 70, and a voltage (for example, 5 volts) is applied from the determination unit 70 to one end of the MR sensor 61. The other end of the MR sensor 61 is connected to the base of the NPN transistor 65. The collector of the NPN transistor 65 is connected to one end of the MR sensor 61 on the determination unit 70 side. The emitter of the NPN transistor 65 is grounded through a series circuit of a resistor 66 and coils 67a and 67b. A connection point γ between the resistor 66 and the coil 67 b is grounded via a capacitor 68.

  As shown in FIGS. 4 and 6, the coil 67a is wound around an L-shaped core material 62a. Similarly, the coil 67b is wound around the L-shaped core material 62b. The core members 62a and 62b are made of a magnetic material, specifically, permalloy which is a high permeability material. The front end surfaces of both core members 62a and 62b are opposed to each other, and the MR sensor 61 is disposed in a close state therebetween. Thus, the core members 62a and 62b are magnetically coupled to the MR sensor 61 (magnetic switch 63). The magnetic material (magnetic force) of the magnet 50 is collected by the core members 62a and 62b and can be transmitted to the MR sensor 61 to increase the magnetic flux density in the MR sensor 61.

  7 is turned on by the magnetic field H1 of the magnet 50. That is, the current flowing through the MR sensor 61 is increased by the magnetic field H1 of the magnet 50, the base current flows through the NPN transistor 65, and the NPN transistor 65 is turned on.

  When the magnetic switch 63 (NPN transistor 65) is turned on, a reverse magnetic field H2 that cancels the magnetic field H1 of the magnet 50 is generated in the coils 67a and 67b. That is, when the NPN transistor 65 is turned on, a constant current is supplied to the coils 67a and 67b to generate the reverse magnetic field H2. This reverse magnetic field H2 cancels the magnetic field H1 of the magnet 50. That is, when no current is supplied to the coils 67a and 67b, magnetic force is collected through the cores 62a and 62b and a magnetic field is applied to the MR sensor 61 with a predetermined magnetic flux density. The magnetic flux density applied to the sensor 61 can be made almost zero. As a result, since the current flowing through the MR sensor 61 becomes small, the NPN transistor 65 is turned off and the current supply to the coils 67a and 67b is stopped.

  As a result, the reverse magnetic field H2 generated in the coils 67a and 67b is also "0". When the reverse magnetic field H2 generated in the coils 67a and 67b becomes “0”, the magnetic switch 63 (NPN transistor 65) is turned on by the magnetic field H1 of the magnet 50.

  This operation is repeated and the magnetic switch 63 performs a switching operation. At this time, a delay circuit is configured by the resistor 66 and the capacitor 68. When the magnetic switch 63 is turned on by the delay circuit (the resistor 66, the capacitor 68), the current flowing through the coils 67a and 67b is delayed to delay the magnetic switch 63. The switching cycle is lengthened.

  7 includes a control unit 71, a current monitoring unit 72, a memory 74, and a shunt resistor 73. The control unit 71 is connected to the MR sensor 61 of the detection unit 60 via the shunt resistor 73, a voltage is applied from the control unit 71 to the MR sensor 61, and a current is detected by the shunt resistor 73. The current monitoring unit 72 takes in a voltage corresponding to the energization current from the shunt resistor 73 and sends the result to the control unit 71. The control unit 71 is configured using a CPU or a programmable device, acquires the output signal of the current monitoring unit 72, and the window glass is opened when the switching period of the magnetic switch 63 is shorter than a predetermined threshold based on the output signal. It is determined that the magnet 50 has been dropped. That is, the determination unit 70 detects the fall of the magnet 50 due to the breakage of the window glass 5 based on the switching period of the magnetic switch 63. The memory 74 stores data such as threshold values. When the window glass is broken, the control unit 71 causes the alarm unit 80 to issue an alarm.

Next, the relationship between the distance between the magnet 50 and the MR sensor 61 and the switching cycle of the magnetic switch 63 will be described.
FIG. 8A shows a case where the magnet 50 is close to the MR sensor 61, and FIG. 8B shows a case where the magnet 50 is far from the MR sensor 61.

The vertical axis in FIG. 9 indicates the current flowing through the coils 67a and 67b (current flowing through the γ point in FIG. 7) and the current flowing through the β point in FIG. 7, and the horizontal axis indicates time.
FIG. 9A shows the operation when the magnet positions in FIG. 8A are close. In FIG. 9A, since the position of the magnet 50 is close to the MR sensor 61, the magnetic force of the magnet 50 acts on the MR sensor 61 strongly. Therefore, a large amount of current must be supplied to the coils 67a and 67b in order to cancel the magnetic force of the magnet 50. Therefore, the time for turning the magnetic switch 63 from on to off becomes long. On the other hand, FIG.9 (b) has shown the operation | movement when the magnet position of FIG.8 (b) is far. In FIG. 9B, since the position of the magnet 50 is far from the MR sensor 61, the magnetic force of the magnet 50 acts on the MR sensor 61 weakly. Therefore, the current supplied to the coils 67a and 67b in order to cancel the magnetic force of the magnet 50 may be small. Therefore, the time for turning the magnetic switch 63 from on to off is shortened.

Thus, the switching cycle of the magnetic switch 63 is inversely proportional to the distance between the magnet 50 and the MR sensor 61.
Next, the operation of the breakage detecting device for the open / close type window glass configured as described above, that is, the operation when the window glass 5 is broken (broken) will be described.

  In normal times, the window glass 5 is closed when the occupant leaves the vehicle. If the window glass 5 is closed when the parking brake is being operated, the glass breakage detection mode is set. On the other hand, as shown in FIG. 5, the clip 40 disposed at the end of the window glass 5 sandwiches the end of the window glass 5. Specifically, the window glass 5 is sandwiched between the first member 41 and the second member 42 by the elastic force of the clip 40 itself. Further, the magnet 50 is located in front of the MR sensor 61 of the detection unit 60.

  If the window glass 5 is broken from this state, the strength thereof is lowered. That is, when a part of the window glass 5 made of tempered glass is broken, as shown in FIG. 10, the window glass 5 is cracked and the strength is significantly reduced (the glass strength is reduced when the glass is broken).

  As the strength decreases, the clip 40 crushes the end portion (lower end portion) of the window glass 5 by its clamping force as shown in FIG. That is, the window glass 5 made of tempered glass is partially and completely pulverized (pulverized) by its own spring force. Thereby, as shown in FIG. 12, the clip 40 falls.

  Specifically, as shown in FIG. 10, the window glass 5 is pushed by the urging force of the second member 42 and comes into contact with the first member 41 of the clip 40. In this state, as shown in FIG. 11, the window glass 5 is pressed by the second member 42 in a state where the periphery of the through hole 44 is supported, and the window glass 5 in the through hole 44 is crushed into pieces (window glass 5 Is broken into an inverted U-shape). Then, as shown in FIG. 12, the clip 40 falls.

  When the switching period of the magnetic switch 63 becomes shorter than a predetermined threshold in the determination unit 70 of FIG. 7, it is detected that the window glass has been broken and the clip 40 has been dropped. When the window glass is broken, the control unit 71 causes the alarm unit 80 to issue an alarm.

In this way, if the tempered glass is partially broken, it can be cracked and the strength is remarkably reduced, so that undetected and erroneous detection can be minimized.
5 includes a first member 41 and a second member 42 which are formed by bending and opposing a steel plate for a leaf spring. Between the first member 41 and the second member 42 where the window glass 5 is disposed. The first member 41 and the second member 42 are biased in a direction approaching each other in a state where they are in contact with each other at a position shifted in the plane of the window glass 5. As a result, a force is applied to the window glass 5 at different locations on the front surface 5a and the back surface 5b of the window glass 5, so that the window glass is accompanied by breakage of the window glass 5 (with a decrease in the strength of the window glass 5). It is possible to reliably detect the breakage of the window glass 5 by reliably crushing the end portion of the window 5.

  Further, the contact portion of the first member 41 of the clip 40 of FIG. 5 with the window glass 5 is separated from the contact portion of the second member 42 with the window glass 5 in the plane of the window glass 5 and the first member. Both contact portions with the window glass 5 in 41 are connected around the contact portion with the window glass 5 in the second member 42. Therefore, as shown in FIG. 10, the window glass 5 is pressed in a state where the window glass 5 is in contact with the first member 41 around the contact portion of the second member 42 with the window glass 5. That is, in the first member 41, the window glass 5 is pressed inside the inner periphery of the through hole 44 in a state where the window glass 5 is supported around the through hole 44. Thereby, as shown in FIG. 11, the edge part of the window glass 5 can be easily crushed and the clip 40 can be reliably dropped.

According to the above embodiment, the following effects can be obtained.
(1) The magnetic switch 63 includes the reverse field generating coils 67a and 67b that are connected to the magnetic switch 63 and generate a reverse magnetic field that cancels the magnetic field of the magnet 50 when the magnetic switch 63 is turned on to turn on the magnetic switch 63. It was wound around core materials 62a and 62b made of a magnetic material magnetically coupled to the MR sensor 61. Thereby, it is possible to efficiently apply a reverse magnetic field to the magnetic switch 63 and detect the breakage of the window glass.

  explain in detail. When the magnet 50 is in the minimum magnetic force position, it is necessary to turn on the magnetic switch by setting the magnetic flux density at the MR sensor position to a predetermined value or more, and when the magnet 50 is in the maximum magnetic force position, the magnetic field H1 of the magnet 50 is required. It is necessary to turn off the magnetic switch by setting the combined magnetic flux in the coil reverse magnetic field H2 to a predetermined value or less. For this purpose, a strong coil reverse magnetic field H2 is required. In this embodiment, the core materials (cores) 62a and 62b made of a magnetic material are magnetically coupled to the MR sensor 61, and the reverse field generating coils 67a and 67b are wound around the core materials 62a and 62b. The magnetic force of the magnet 50 can be efficiently transmitted to the MR sensor 61. Further, since the magnetomotive force of the coils 67a and 67b can be efficiently transmitted to the MR sensor 61, the magnetic force of the magnet 50 can be canceled with a small current.

  (2) The magnet 50 is fixed to the clip 40 that sandwiches the window glass at the end portion of the window glass, and the clip 40 is biased in a direction approaching each other at a position shifted in the plane of the window glass. Yes. Therefore, the edge part of the window glass 5 can be crushed reliably with the breakage of the window glass 5.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The core material (62a, 62b) may be other material of permalloy, for example, a fine mate or an amorphous laminated core.

A Hall element may be used instead of the MR sensor 61.
Although the magnetic switch 63 is configured by the MR sensor 61 and the NPN transistor 65, the magnetic switch may be configured by a reed switch instead. Here, the reed switch is in a state in which the reed contact inside the reed switch is not in contact (off) during non-operation, the reed contact is magnetized by the magnetic force applied from the outside during operation, and the reed contact contacts (on) . When the magnetic force is removed, the contact lead contacts are not contacted by elasticity (off).

  A configuration shown in FIGS. 13, 14, 15, 16, and 17 may be used instead of FIG. In FIG. 13, the bent portions of the core members 62a and 62b protrude. In FIG. 14, winding portions of the coils 67a and 67b in the core members 62a and 62b extend to the left and right. In FIG. 15, the directions of the L-shaped core members 62a and 62b are opposite to those in FIG. In FIG. 16, the core materials 62a and 62b are straight lines. In FIG. 17, only one straight core member (62b) is used.

Although the X-arm type window regulator is used as the window regulator, a cable-type window regulator may be used.
The driving means is not limited to the one having a motor, but may be manually operated by a passenger.

  ・ The window glass breakage detection device was applied to the right front door of a passenger car, but it can of course be applied to other side doors. You may apply to the provided opening-and-closing type glass roof.

  -Although the clip 40 was installed in the lower end part of the window glass 5, you may install not only in this but in the lower part in the side surface of the window glass 5, for example. In short, what is necessary is just to install in the place which is not conspicuous inside the vehicle door 1 among the edge parts of a window glass.

The disassembled perspective view in the right front door in a passenger car. The schematic front view in the right front door in a passenger car. The longitudinal cross-sectional view in the AA line of FIG. The perspective view of the breakage detection apparatus of an opening-and-closing type window glass. (A) is a front view of a breakage detection device for an openable window glass, and (b) is a longitudinal sectional view taken along line AA of (a). B arrow view of Fig.5 (a). The figure which shows the electrical constitution of the breakage detection apparatus of an open / close type window glass. (A) is a figure which shows the case where a magnet position is near, (b) is a figure which shows the case where a magnet position is far. (A) is a waveform diagram when the magnet position is close, (b) is a waveform diagram when the magnet position is far. (A) is a front view of a breakage detection device for an openable window glass, and (b) is a longitudinal sectional view taken along line AA of (a). (A) is a front view of a breakage detection device for an openable window glass, and (b) is a longitudinal sectional view taken along line AA of (a). (A) is a front view of a breakage detection device for an openable window glass, and (b) is a longitudinal sectional view taken along line AA of (a). The top view of the breakage detection apparatus of the opening-and-closing type window glass in another example. The top view of the breakage detection apparatus of the opening-and-closing type window glass in another example. The top view of the breakage detection apparatus of the opening-and-closing type window glass in another example. The top view of the breakage detection apparatus of the opening-and-closing type window glass in another example. The top view of the breakage detection apparatus of the opening-and-closing type window glass in another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vehicle door, 4 ... Opening part, 5 ... Window glass, 30 ... Opening-and-closing type window glass breakage detection apparatus, 40 ... Clip, 50 ... Magnet, 60 ... Detection part, 61 ... Magnetic sensor, 62a, 62b ... Core material 63 ... Magnetic switch, 67a, 67b ... Coil, 70 ... Determination part.

Claims (4)

A magnet that is provided on a window glass that can freely open and close the opening of the vehicle and generates a certain magnetic field;
A magnetic switch that is turned on by the magnetic field of the magnet;
A reverse magnetic field generating coil that is connected to the magnetic switch and generates a reverse magnetic field that cancels the magnetic field of the magnet when the magnetic switch is turned on to turn off the magnetic switch;
Determining means for detecting the fall of the magnet due to breakage of the window glass based on the switching period of the magnetic switch;
A magnetic material, magnetically coupled to the magnetic switch, and a core material around which the reverse magnetic field generating coil is wound;
An opening / closing type window glass breakage detecting device characterized by comprising:   The open / close-type window glass breakage detecting device according to claim 1, wherein the core member is made of a high permeability material.  The open / close-type window glass breakage detection device according to claim 1, wherein the magnet is fixed to a clip that sandwiches the window glass at an end portion of the window glass.  The open / close-type window glass breakage detecting device according to claim 3, wherein the clips are biased toward each other at positions shifted in a plane of the window glass.

Images