JP4065071B2 - Window glass breakage detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for detecting breakage of a window glass, and more particularly to a breakage detection apparatus for a window glass suitable for preventing vehicle theft caused by breakage of the window glass.
[0002]
[Prior art]
Japanese Laid-Open Patent Publication No. 61-150852 discloses a technique for detecting breakage of a window glass in order to prevent theft of a vehicle.
[0003]
[Problems to be solved by the invention]
In the above conventional one, an infrared receiver and an infrared receiver are installed at positions separated from each other in the vehicle, and infrared rays from the infrared receiver are sequentially reflected and transmitted to the infrared receiver. A plurality of window glasses and a plurality of reflecting mirrors are disposed between the infrared receiver and the infrared receiver, and when the window glass is broken, the reception level of infrared rays by the infrared receiver changes. To detect damage.
[0004]
However, according to the above-described conventional detection device, a reflector is required to detect breakage of the window glass, and when a load or the like is loaded in the vehicle, an infrared receiver is applied due to an infrared reflected wave hitting the load. The reception level of the camera may change, and a broken window glass may be erroneously detected.
[0005]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a window glass breakage detection apparatus that can reliably detect breakage of a window glass with a small number of parts.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is directed to an infrared transmitter disposed in contact with a window glass so that infrared rays are incident on the window glass, and an infrared reflected wave emitted from the window glass. An infrared receiver disposed in contact with the window glass at a position adjacent to the infrared transmitter to receive; a determination means for determining breakage of the window glass based on a reception level of an infrared reflected wave by the infrared receiver; An informing means for informing operation when it is judged by the judging means that the window glass is broken, and the infrared transmitter passes through the transmitter to the virtual line perpendicular to the window glass. It is arranged so that infrared rays are output by tilting away from the infrared receiver toward the glass, and the determination means corresponds to the reception level received by the infrared receiver when the window glass is in a non-damaged state. When the infrared receiver receives a reflected wave having a level greater than the first level that is greater than the reference level, it is determined that a part of the window glass is broken except for the contact point of the infrared transmitter and the infrared receiver, and the reference When the infrared receiver receives a reflected wave of a level equal to or lower than the second level smaller than the level, it is determined that substantially all of the window glass including the contact portion of the infrared transmitter and the infrared receiver is broken. .
[0007]
According to this configuration, when the window glass is broken, the amount of infrared rays escaping from the window glass changes according to the change in the area of the window glass, and the reception level of the infrared reflected wave by the infrared receiver also changes accordingly. Therefore, the judgment means can detect the breakage of the window glass, can reduce the number of parts compared to the conventional one using a reflecting mirror, and is obstructed by members other than the window glass. Without breaking, it is possible to reliably detect breakage of the window glass.
[0008]
In particular, the infrared transmitter is arranged so that infrared rays are output by tilting toward the window glass away from the infrared receiver with respect to a virtual line passing through the transmitter and orthogonal to the window glass. When the window glass breaks at a part other than the contact point of the infrared transmitter and infrared receiver, the amount of infrared rays escaping from the window glass to the outside is reduced by reducing the area of the window glass, and the infrared reflection by the infrared receiver Since the reception level of the wave is higher than the reference level when the window glass is in a non-damaged state, the window glass is received in response to the infrared receiver receiving a reflected wave having a level higher than the first level. It is possible to determine that a part of the window glass is damaged, and when almost all of the window glass including the contact points of the infrared transmitter and infrared receiver is damaged, Since the wave is hardly input to the infrared receiver, the reception level of the infrared reflected wave by the infrared receiver is smaller than the reference level when the window glass is in the non-damaged state, so that the second level is smaller than the reference level. It is possible to determine that almost all of the window glass has been damaged in response to the infrared receiver receiving a reflected wave of the following level. It can be detected separately from the total loss state.
[0009]
Moreover, in addition to the structure of the said invention of Claim 1, invention of Claim 2 raises the window glass supported by this door main body so that raising / lowering is possible in the door main body which comprises a vehicle door with a window glass. The infrared transmitter and the infrared receiver are accommodated so as to come into contact with the window glass when fully closed, and according to such a configuration, the infrared transmitter and the infrared receiver Is placed at a position that is not affected by ambient light, so that the detection accuracy can be improved and the infrared transmitter and receiver cannot be seen from the outside. The top is also convenient .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.
[0011]
1 to 5 show an embodiment of the present invention, FIG. 1 is a diagram showing the configuration of a window glass breakage detecting device, and FIG. 2 is a longitudinal sectional view showing the configurations of an infrared transmitter and an infrared receiver. 3 is a longitudinal sectional view of the vehicle door with the window glass closed, FIG. 4 is a longitudinal sectional view of the vehicle door with the window glass opened, and FIG. 5 is the light output and infrared of the infrared transmitter. It is a figure which shows the output characteristic from a receiver.
[0012]
First, in FIG. 1, the breakage detection apparatus is configured to receive an infrared transmitter 2 disposed in contact with the window glass 1 so that infrared rays are incident on the window glass 1, and an infrared reflected wave emitted from the window glass 1. Based on the infrared receiver 3 disposed in contact with the window glass 1 at a position adjacent to the infrared transmitter 2 to receive and the reception level of the reflected infrared wave by the infrared receiver 3, the breakage of the window glass 1 is determined. An electronic control unit 4 as a determination unit and a buzzer 5 as a notification unit that performs a notification operation when the electronic control unit 4 determines that the window glass 1 is broken are provided.
[0013]
The infrared transmitter 2 includes a high-brightness LED chip 6 or an LED lamp that outputs infrared rays toward the window glass 1 and a driver circuit 7 including a transistor 8. 4, infrared rays are incident on the window glass 1 in a pulse form from the high-intensity LED chip 6 or the LED lamp.
[0014]
The infrared receiver 3 includes a photosensor 9 that receives infrared rays from the window glass 1 and an amplifier circuit 10 that includes an operational amplifier 11, and a voltage output from the photosensor 9 according to the amount of received infrared rays. Amplified by the operational amplifier 11 and input to the electronic control unit 4.
[0015]
By the way, a part of the infrared rays incident on the window glass 1 from the infrared transmitter 2 escape to the outside from the surface of the window glass 1, but the remaining infrared rays are reflected by the surface of the window glass 1. The receiver 3 receives the reflected wave reflected by the surface of the window glass 1. As apparent from FIGS. 1 and 2, the infrared transmitter 2 is on the side away from the infrared receiver 3 toward the window glass 1 with respect to a virtual line passing through the transmitter 2 and orthogonal to the window glass 1. It is arranged so that infrared rays are output at an angle.
[0016]
Referring also to FIG. 2, the infrared transmitter 2 and the infrared receiver 3 are accommodated in a common housing 12, and the high-brightness LED chip 6 is formed on the surface of the substrate 13 fixedly arranged in the housing 12. Alternatively, an LED lamp is provided, a photosensor 9 is provided adjacent to the high-intensity LED chip 6 or the LED lamp, and the driver circuit 7 and the amplifier circuit 10 are provided on the back surface of the substrate 13.
[0017]
Further, the housing 13 includes a first storage chamber 15 in which the high-intensity LED chip 6 or the LED lamp is disposed and a second storage chamber 16 in which the photosensor 9 is disposed in the housing 12 on the side facing the surface of the substrate 13. A partition wall 14 is provided, and lenses 17 and 18 are attached to the opening ends of the first and second storage chambers 15 and 16 on the side of the window glass 1.
[0018]
3 and 4, the window glass 1 is supported by the door body 19 that constitutes the vehicle door 20 together with the window glass 1 so as to be movable up and down, and the housing of the infrared transmitter 2 and the infrared receiver 3. 12 is housed in a fixed position in the door body 19.
[0019]
Moreover, the housing 12 comes into contact with the window glass 1 when the bent window glass 1 rises and is fully closed (in the state shown in FIG. 3), but when the window glass 1 is lowered and opened. In the state shown in FIG. 4, they are arranged so as to be separated from the window glass 1. Further, at least a portion of the housing 12 on the side of the window glass 1 is formed of a synthetic resin so as to elastically contact the window glass 1.
[0020]
As described above, the housing 12, that is, the infrared transmitter 2 and the infrared receiver 3 come into contact with the window glass 1 when the window glass 1 is closed, so that the window glass 1, the infrared transmitter 2, and the infrared receiver 3 are contacted. It is possible to minimize the escape of infrared rays between the two. The infrared transmitter 2 and the infrared receiver 3 are not moved up and down together with the window glass 1 and are arranged at fixed positions, so that lead wires (not shown) connected to the infrared transmitter 2 and the infrared receiver 3 are arranged. Moreover, an unreasonable force is not applied due to the raising and lowering of the window glass 1.
[0021]
Referring again to FIG. 1, the electronic control unit 4 has door opening / closing detection means 21 for detecting the opening / closing state of the vehicle door 20 and a key cylinder lock (not shown) of the vehicle door 20 locked by an operation from outside the vehicle. Signals from the door key cylinder locking / unlocking detecting means 22 for detecting whether the window glass 1 is in the state and the window closing state detecting means 23 for detecting whether the window glass 1 is in the fully closed state are inputted, The detection means 21 detects the fully closed state of the vehicle door 20, the door key cylinder locking / unlocking detection means 22 detects the state in which the key cylinder lock of the vehicle door 20 is locked from the outside of the vehicle, and the window is closed. Only when the fully closed state of the window glass 1 is detected by the detecting means 23, the electronic control unit 4 determines whether the window glass 1 is broken. Further, when the unlocking of the key cylinder lock of the vehicle door 20 is detected by the door key cylinder locking / unlocking detecting means 22, the electronic control unit 4 resets the breakage state determination processing of the window glass 1.
[0022]
In FIG. 5, the electronic control unit 4 includes a first level L1 larger than a reference level LB corresponding to a reception level received by the infrared receiver 3 when the window glass 1 is in a non-damaged state, and the reference level LB. The second level L2 smaller than the first level L2 is set in advance, and when the infrared receiver 3 receives a reflected wave having a level equal to or higher than the first level L1, the electronic control unit 4 is connected to the infrared transmitter 2 and the infrared receiver 3. When it is determined that a part of the window glass 1 is broken except for the contact point, and the infrared receiver 3 receives the reflected wave of the second level 2 or lower, the contact point between the infrared transmitter 2 and the infrared receiver 3 is determined. It is judged that almost all of the window glass 1 was damaged. Thus, the electronic control unit 4 changes the alarm mode by the buzzer 5 when it is determined that a part of the window glass 1 is damaged and when it is determined that substantially all of the window glass 1 is damaged. Then, the buzzer 5 is operated.
[0023]
Next, the operation of this embodiment will be described. When the vehicle door 20 is closed and the key cylinder lock is locked by an operation from the outside of the vehicle, and the window glass 1 is closed, Infrared light is incident from an infrared transmitter 2 that is in contact with the window glass 1, and is reflected on the surface of the window glass 1 by an infrared receiver 3 that is in contact with the window glass 1 at a position adjacent to the infrared transmitter 2. The returning infrared ray is received. When the window glass 1 is broken in such a state, the amount of infrared rays reaching the infrared receiver 3 changes according to the change in the area of the window glass 1, and the infrared reflection received by the infrared receiver 3 accordingly. The wave reception level will also change. Moreover, the output of the infrared receiver 3 is input to the electronic control unit 4, and the breakage of the window glass 1 based on the reception level of the reflected infrared wave by the infrared receiver 4 is determined by the electronic control unit 4. When the electronic control unit 4 determines that the window glass 1 is broken, the buzzer 5 is activated to notify the window glass 1 of breakage.
[0024]
Therefore, it is possible to detect breakage of the window glass 1 while reducing the number of parts as compared with the conventional one using a reflecting mirror, and the window glass 1 is not obstructed by members other than the window glass 1. Damage can be reliably detected.
[0025]
The infrared transmitter 2 and the infrared receiver 3 are accommodated in the door body 19 of the vehicle door 20 so as to come into contact with the window glass 1 when the window glass 1 is raised and fully closed. The infrared transmitter 2 and the infrared receiver 3 are not affected by disturbance light and can improve the detection accuracy, and the infrared transmitter 2 and the infrared receiver 3 are not visible from the outside. This is also convenient in terms of the appearance of the vehicle door 20.
[0026]
By the way, as shown by the solid line A in FIG. 5, when the light output from the infrared transmitter 2 is constant and the window glass 1 is not damaged, the reception level received by the infrared receiver 3 is also a reference indicated by a broken line. It is constant like level LB. However, assuming that the window glass 1 is broken at time t1, when the window glass 1 is broken at a part other than the contact portion of the infrared transmitter 2 and the infrared receiver 3, the area of the window glass 1 is reduced. The amount of infrared rays escaping from the glass 1 to the outside is reduced, and the reception level of the infrared reflected wave by the infrared receiver 3 is higher than that when the window glass 1 is in a non-damaged state as indicated by the broken line B. When almost all of the window glass 1 including the contact portion of the transmitter 2 and the infrared receiver 3 is broken, the reflected wave is hardly input to the infrared receiver 3. Is smaller than when the window glass 1 is in an unbroken state as indicated by a chain line C.
[0027]
Thus, the electronic control unit 4 transmits reflected waves having a level equal to or higher than the first level L1 higher than the reference level LB corresponding to the reception level received by the infrared receiver 3 when the window glass 1 is in a non-damaged state. When the receiver 3 receives the signal, it is determined that a part of the window glass 1 is broken except for a contact portion between the infrared transmitter 2 and the infrared receiver 3, and the level of the second level L2 which is smaller than the reference level LB is lower than the second level L2. When the reflected wave is received by the infrared receiver 3, it is determined that almost all of the window glass 1 including the contact portion of the infrared transmitter 2 and the infrared receiver 3 is broken. Therefore, the broken state of the window glass 1 can be detected by distinguishing between the partially broken state and the completely broken state, and the window glass 1 is made different by changing the operation mode of the buzzer 5 according to the change of the broken state. Can be recognized by distinguishing between a partially damaged state and a completely damaged state.
[0028]
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.
[0029]
For example, in the above-described embodiment, the case where the present invention is applied to the vehicle door 20 has been described. However, the present invention can be widely applied to, for example, detecting damage to a window glass of a house.
[0030]
【The invention's effect】
As described above, according to the first aspect of the present invention, it is possible to reduce the number of parts, and avoid being disturbed by a member other than the window glass, thereby reliably detecting breakage of the window glass. can do.
[0031]
In particular, the infrared transmitter is arranged so that infrared rays are output by tilting toward the window glass away from the infrared receiver with respect to a virtual line passing through the transmitter and orthogonal to the window glass. When the window glass breaks at a part other than the contact point of the infrared transmitter and infrared receiver, the amount of infrared rays escaping from the window glass to the outside is reduced by reducing the area of the window glass, and the infrared reflection by the infrared receiver Since the reception level of the wave is higher than the reference level when the window glass is in a non-damaged state, the window glass is received in response to the infrared receiver receiving a reflected wave having a level higher than the first level. It is possible to determine that a part of the window glass is damaged, and when almost all of the window glass including the contact points of the infrared transmitter and infrared receiver is damaged, Since the wave is hardly input to the infrared receiver, the reception level of the infrared reflected wave by the infrared receiver is smaller than the reference level when the window glass is in the non-damaged state, so that the second level is smaller than the reference level. It is possible to determine that almost all of the window glass has been damaged in response to the infrared receiver receiving a reflected wave of the following level. It can be detected separately from the total loss state.
[0032]
Further, according to the invention described in claim 2, not only the detection accuracy can be improved, but also the appearance of the vehicle door can be improved .
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a window glass breakage detection apparatus.
FIG. 2 is a longitudinal sectional view showing a configuration of an infrared transmitter and an infrared receiver.
FIG. 3 is a longitudinal sectional view of the vehicle door with the window glass closed.
FIG. 4 is a longitudinal sectional view of a vehicle door with a window glass opened.
FIG. 5 is a diagram showing the optical output of the infrared transmitter and the output characteristics from the infrared receiver.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Window glass 2 ... Infrared transmitter 3 ... Infrared receiver 4 ... Electronic control unit 5 as judgment means ... Buzzer 19 as notification means ... Door body 20 ... For vehicles door

Claims (2)

An infrared transmitter (2) disposed in contact with the window glass (1) so that infrared rays are incident on the window glass (1), and an infrared reflected wave emitted from the window glass (1) An infrared receiver (3) disposed in contact with the window glass (1) at a position adjacent to the infrared transmitter (2), and a window glass (based on the reception level of infrared reflected waves by the infrared receiver (3)) 1) determining means (4) for determining breakage, and notifying means (5) for notifying operation when it is determined by the determining means (4) that the window glass (1) is damaged ,
The infrared transmitter (2) is on the side away from the infrared receiver (3) toward the window glass (1) with respect to a virtual line passing through the transmitter (2) and orthogonal to the window glass (1). It is arranged so that infrared rays are output at an angle,
The judging means (4) is configured to reflect a reflected wave having a level equal to or higher than a first level higher than a reference level corresponding to a reception level received by the infrared receiver (3) when the window glass (1) is in a non-damaged state. When the infrared receiver (3) receives it, it is determined that a part of the window glass (1) is broken except for the contact points of the infrared transmitter (2) and the infrared receiver (3), and is smaller than the reference level. When the infrared receiver (3) received a reflected wave of a level equal to or lower than the second level, almost all of the window glass (1) was damaged including the contact point of the infrared transmitter (2) and the infrared receiver (3). An apparatus for detecting breakage of a window glass, characterized in that: In the door body (19) which constitutes the vehicle door (20) together with the window glass (1), the window glass (1) supported so as to be movable up and down by the door body (19) rises and is fully closed. 2. The window glass breakage detection according to claim 1, wherein the infrared transmitter (2) and the infrared receiver (3) are accommodated so as to come into contact with the window glass (1). Equipment .

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