JP2009061820A - Glass breakage detection device of automobile window - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably detect a crack of window glass by setting the window glass at a part for detecting the crack of the glass from a cracked state to a scattered state when the window glass is broken. <P>SOLUTION: The non-opening/closing type window glass 13 is constituted of a glass sheet which is wholly cracked when a part thereof is broken. The window glass 13 is fixed to a body 15 at its peripheral edge with an adhesive 14. A leaf spring 16 is provided at the body 15 at a part corresponding to the circumferential edge of the window glass 13. The leaf spring 16 is provided so that pressure capable of breaking a part of the window glass 13 when the window glass 13 is cracked is applied to the window glass 13. A micro switch 17 is fixed to the body 15 to a part of the body 16 corresponding to the part to be broken by the action of the leaf spring 16 so that the movement of an actuator 18 to a projecting side is regulated by the window glass 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a glass breakage detection apparatus for automobile windows, and more particularly to a glass breakage detection apparatus for glass windows that cannot be opened and closed, such as glass windows and quarter windows for back doors.

  Conventionally, a glass break detection device that detects when a window glass has been broken has been provided to prevent the vehicle window from being stolen or being damaged by car storms while parking. It has been proposed to activate the alarm means based on the glass breakage detection signal of the glass breakage detection device.

Conventionally, a stress sensor that is provided at the upper edge of an openable / closable window glass and is compressed between the window glass and the window frame when the window glass is closed; A vehicle anti-theft device including warning means for determining whether or not is necessary and performing a warning operation has been proposed (see, for example, Patent Document 1). In the apparatus disclosed in Patent Document 1, the stress sensor has a substantially linear form including substantially linear first and second electrode members arranged to face each other substantially in parallel, and both electrode members apply stress. Thus, the stress is detected by bringing them into electrical contact with each other. When the window glass is cracked when the window glass is closed, the compression state of the stress sensor held by the window glass is released, and the stress sensor returns to its original shape and the elastic conductive tube It is detected that the electrical continuity with the center electrode member has been eliminated and the window glass has been broken.
JP 2004-155251 A

  For window glass for automobiles, tempered glass is usually used except for windshield glass. When an impact is applied to the tempered glass and part of the tempered glass breaks, the glazed glass is cracked over the entire glass and is scattered as small fragments. However, depending on the degree of impact, even if the entire window glass is cracked, the shape may be maintained in a cracked state. Moreover, in the case of a window glass that cannot be opened and closed, it is less likely to scatter than a window glass that can be opened and closed. Further, in order to prevent the criminals from scattering, if the glass breaks in a state where the tape is attached to the window glass, the scattering is prevented. Therefore, the detection method using the stress sensor described in Patent Document 1 cannot detect a glass break in such a case.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to make the window glass in a portion where the glass crack should be detected scattered from the cracked state when the window glass is cracked. Another object of the present invention is to provide a glass breakage detecting device for an automobile window that can reliably detect the breakage of the window glass.

  In order to achieve the above-mentioned object, the invention according to claim 1 is a glass crack detection device for an automobile window, which uses a glass plate that is cracked as a whole when a part of the glass plate is broken. And a pressing force applying means provided in a state where a pressing force having a strength capable of breaking a part of the window glass when the window glass is cracked is applied to the window glass; It is provided corresponding to the part destroyed by the action of the pressure applying means, and includes a glass breakage detection unit that changes the state due to the breakage of the window glass and brings the glass breakage detection circuit into a detection state. Here, “breakage of the window glass” means that the window glass is broken not to be cracked but to a scattered state.

  In this invention, when a part of window glass breaks and the whole window glass cracks, the window glass of the part pressed at least by the effect | action of the pressing force provision means is destroyed. And the state of the glass breakage detection part provided corresponding to the part destroyed by the effect | action of a pressing force provision means changes, and a glass breakage detection circuit will be in a detection state. Therefore, when the window glass is cracked, the window glass at the portion where the glass crack should be detected is made to be scattered from the cracked state, and the window glass can be reliably detected.

  According to a second aspect of the present invention, in the first aspect of the present invention, the pressing force applying means is formed of a spring, the glass breakage detecting portion is an actuator portion of a microswitch, and the window glass is broken. It is arranged so as to be operable. In the present invention, when the window glass is not broken, the actuator unit is in a position to hold the electric circuit in the open circuit state or the closed circuit state. When the window glass is broken, the position of the actuator portion changes from the state before the window glass is broken, and the glass breakage detection circuit enters the glass breakage detection state, and the glass breakage is detected.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the pressing force applying means is provided at a location where the peripheral edge of the window glass is pressed. In the present invention, the pressing force applying means can be arranged at an inconspicuous location, and the pressing of the peripheral portion is less likely to press the cracked glass plate than the pressing of the inner portion. Can be destroyed.

  According to the present invention, when the window glass is broken, the window glass in the portion where the glass crack should be detected is made to be scattered from the cracked state, and the automobile can detect the window glass crack reliably. It is possible to provide a glass breakage detection device for an industrial window.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1A, a quarter window 12 as a window glass that cannot be opened and closed is provided on the left and right sides (only the left side is shown) at the rear of the vehicle 11.

  FIG. 1B is a partial cross-sectional view near the right quarter window 12 corresponding to the line BB in FIG. As shown in FIG. 1B, the window glass 13 is fixed to the body 15 via an adhesive (glass adhesive) 14 at the peripheral edge. The window glass 13 is formed of tempered glass as a glass plate that is cracked as a whole when part of it is broken.

  The body 15 is provided with a leaf spring 16 as a pressing force applying means at a position corresponding to the peripheral edge of the window glass 13 and at a position inside the adhesive 14 with respect to the peripheral edge of the window glass 13. The leaf spring 16 is provided in a state in which a pressing force having a strength capable of breaking a part of the window glass 13 when the window glass 13 is cracked is applied to the window glass 13. That is, the leaf spring 16 is provided at a location where the peripheral edge of the window glass 13 is pressed.

  Further, a micro switch 17 is fixed to the body 15 at a position corresponding to a portion destroyed by the action of the leaf spring 16 at the peripheral edge of the window glass 13. As the actuator portion 18 of the micro switch 17, a spring push button type configured to be biased toward the protruding side is used. The micro switch 17 is fixed to the body 15 in a state where the movement of the actuator portion 18 to the protruding side is restricted by the window glass 13. In other words, the actuator unit 18 is arranged so as to be operable (movable to the protruding side) with the breakage of the window glass 13. In this embodiment, in a state where the window glass 13 is not broken, the actuator unit 18 is in a position to hold the electric circuit of the microswitch 17 constituting the glass breakage detection circuit in an open state (off state). The actuator unit 18 constitutes a glass breakage detection unit that changes its state due to the breakage of the window glass 13 and brings the glass breakage detection circuit into a detection state.

  The leaf spring 16 is fixed to the case 19 of the microswitch 17. The interior 20 of the vehicle 11 is provided so as to cover a portion where the leaf spring 16 and the micro switch 17 are provided. A thin film layer 21 for concealing the inside is formed on the peripheral edge of the window glass 13. The thin film layer 21 is formed, for example, by screen printing a black ceramic paste.

  The microswitch 17 is connected to the controller 22, and the controller 22 is connected to the alarm device 23. The alarm device 23 is activated by a command from the controller 22 and notifies the outside that the window glass 13 is broken by an alarm sound or an alarm lamp.

Next, the operation of the glass breakage detection apparatus configured as described above will be described.
During normal times when the window glass 13 is not damaged, the actuator portion 18 of the microswitch 17 is held in contact with the window glass 13. Further, the window glass 13 is held in a state where a pressing force is applied by a leaf spring 16 in the vicinity of a portion where the actuator portion 18 abuts.

  If a part of the window glass 13 is broken (broken) from this state, the entire window glass 13 made of tempered glass is cracked, and as shown in FIG. 2, the leaf spring 16 and the actuator portion 18 come into contact with each other. The strength is significantly reduced by cracking in the vertical and horizontal directions in the vicinity of the location.

  As the strength decreases, the portion of the window glass 13 that receives the pressing force by the leaf spring 16 is quickly destroyed. Then, the window glass 13 that restricts the protrusion (movement) of the actuator portion 18 is scattered, and the actuator portion 18 protrudes, and the electric circuit of the microswitch 17 is closed (on state), and the controller 22 is turned on. Outputs a glass breakage detection signal. When the controller 22 receives a glass breakage detection signal from the microswitch 17, it outputs a drive command signal to the alarm device 23. Then, the alarm device 23 is activated to notify the outside of the glass breakage (abnormality occurrence) by an alarm sound or an alarm lamp.

According to this embodiment, the following effects can be obtained.
(1) The glass crack detection device uses a tempered glass that detects a glass crack in a window for an automobile that cannot be opened and closed, and that cracks when the glass plate of the window glass 13 is partially broken. The glass breakage detecting device is a pressing force applying means provided in a state in which a pressing force having a strength capable of breaking a part of the window glass 13 is applied to the window glass 13 when the window glass 13 is cracked. (Leaf spring 16) is provided. Further, the glass breakage detection device is provided corresponding to the portion that is broken by the action of the pressing force applying means, and the glass breakage detection circuit that changes the state due to the breakage of the window glass 13 and sets the glass breakage detection circuit to the detection state. Department. Therefore, when the window glass 13 is cracked, it is possible to reliably detect the cracks in the window glass 13 by making the window glass 13 in the portion where the glass break should be detected scattered from the cracked state.

  (2) The glass breakage detection unit is configured by the actuator unit 18 of the microswitch 17 and is arranged so as to be operable with the breakage of the window glass 13. Further, when the window glass 13 is not broken, the actuator unit 18 is in a position to hold the electric circuit in an open circuit state (off state). And if the window glass 13 is destroyed, the position of the actuator part 18 will change, a glass breakage detection circuit will be in a detection state, and a glass breakage can be detected reliably. Therefore, the cost can be reduced compared to other sensors, and it is difficult to be affected by noise. In addition, since the electric circuit is always held in the open circuit state (off state), wasteful power consumption can be suppressed.

  (3) The leaf spring 16 is provided at a location where the peripheral edge of the window glass 13 is pressed. Therefore, the leaf spring 16 and the micro switch 17 can be arranged in an inconspicuous place. Moreover, the direction which presses a peripheral part can destroy the glass plate which cracked with a weak pressing force compared with the case where an inner side is pressed.

  (4) Since the leaf spring 16 is fixed to the case 19 of the micro switch 17, the leaf spring 16 is also arranged at a predetermined position by fixing the micro switch 17 to the body 15. Compared with the structure which attaches to the body 15 separately as a separate body, the effort of attachment becomes easy.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. This embodiment is different from the first embodiment in the configuration of the glass crack detection unit and the shape of the stress applying means. Since other configurations are the same as those of the first embodiment, the same parts are denoted by the same reference numerals and detailed description thereof is omitted.

  As shown in FIG. 4, the glass breakage detection device 24 includes a comparator 25, a reference voltage Vr is input to the non-inverting input terminal of the comparator 25, and a glass breakage detection voltage is input to the inverting input terminal of the comparator 25. Entered. The reference voltage Vr is inputted by dividing the voltage of the power source Vcc by the voltage dividing resistors 26 and 27. The glass breakage detection voltage is inputted by dividing the voltage of the power source Vcc by the voltage dividing resistors 28 and 29. Of the voltage dividing resistors 28 and 29 connected in series, one voltage dividing resistor 28 is connected to the power source Vcc, and the other voltage dividing resistor 29 is grounded. Both the voltage dividing resistors 28 and 29 constitute a glass breakage detection unit 30 that changes its state due to breakage of the window glass 13 and puts the glass breakage detection circuit into a detection state. The output of the comparator 25 is input to the controller 22.

  The leaf spring 16 is fixed to the body 15 in a state where a pressing force capable of breaking a part of the window glass 13 is applied to the window glass 13 when the window glass 13 is cracked. The voltage dividing resistor 29 constituting the glass breakage detection unit 30 is formed as a conductive pattern in the vicinity of the portion pressed by the leaf spring 16 of the window glass 13. When the window glass 13 is partially damaged and cracked, at least a portion where the conductive pattern of the voltage dividing resistor 29 is formed is broken by the pressing force of the leaf spring 16. ing.

  Therefore, in this embodiment, in a normal time when the window glass 13 is not damaged, the voltage input to the non-inverting input terminal of the comparator 25 is higher than the voltage input to the inverting input terminal, and the H level from the comparator 25 is high. A signal is output. Then, the controller 22 determines that the glass is not broken.

  On the other hand, when the window glass 13 is broken and cracks are formed, at least a portion pressed by the leaf spring 16 of the window glass 13 is broken, and the voltage dividing resistor 29 constituting the glass crack detecting unit 30 is a voltage dividing resistance. 28 and a non-conductive state. As a result, the voltage of the power supply Vcc is applied to the inverting input terminal of the comparator 25 without being divided, and the voltage input to the inverting input terminal of the comparator 25 becomes higher than the voltage input to the non-inverting input terminal. The L level signal is output from the comparator 25. Then, the controller 22 determines that the glass is broken, and outputs a drive command signal to the alarm device 23.

Therefore, according to this embodiment, the following effect can be obtained in addition to the effect similar to (1) in the first embodiment.
(5) The voltage dividing resistor 29 on the ground side of the voltage dividing resistors 28 and 29 constituting the glass breakage detecting unit 30 is provided on the window glass 13, and when the window glass 13 is broken, the voltage dividing resistor 28 is not electrically connected. And the state of the detection signal input to the controller 22 is reliably changed. Therefore, the crack of the window glass 13 can be reliably detected.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The window glass 13 is not limited to the quarter window 12 and may be applied to other window glass that cannot be opened and closed using a glass plate that is cracked as a whole when a part thereof is broken. For example, the present invention may be applied to a rear window, a rear side window, a window glass of a hatchback door, a sunroof glass, or the like.

  The pressing force applying means may be any means as long as it is provided in a state where a pressing force capable of destroying a part of the window glass 13 is applied to the window glass 13 when the window glass 13 is cracked. For example, a coil spring may be used instead of 16, or rubber may be interposed without being limited to the spring. Moreover, it is good also as a structure hold | maintained in the state which applied the pressing force to the window glass 13 using an air cylinder. When a coil spring is used for the pressing force applying means, the pressing force can be easily adjusted as compared with the leaf spring.

  (Circle) not only the location which presses the peripheral part of the window glass 13 but a pressing force provision means may be provided near the center. However, when the window glass is colorless and transparent, it is preferable to dispose the pressing force application means at the peripheral edge of the window glass 13 in order not to stand out.

  ○ The glass breakage detection unit only needs to change the state due to the breakage of the window glass 13 so that the glass breakage detection circuit can be brought into a detection state. It is good also as a structure which detects a glass crack by the change of the light reception state of the reflected light of the light radiate | emitted.

Instead of fixing the leaf spring 16 to the case 19 of the micro switch 17, it may be fixed directly to the body 15.
The actuator unit 18 of the micro switch 17 may be configured to be movable integrally with the leaf spring 16 or the coil spring without contacting the window glass 13.

  The micro switch 17 is held in a closed state (on state) instead of a configuration in which the electric circuit constituting the glass breakage detection circuit is held in an open state (off state) in a state where the protrusion of the actuator unit 18 is restricted. It is good also as composition to do. In this case, when the window glass 13 is broken, the microswitch 17 is in an open state (off state), and the open state (off state) is in a state where a glass breakage is detected.

The actuator portion 18 of the micro switch 17 is not limited to a spring push button type, but may be a hinge lever type.
O Without providing the controller 22, the output signal of the micro switch 17 may be directly input to the alarm device 23, and the alarm device 23 may be activated when the micro switch 17 is turned on.

The following technical idea (invention) can be understood from the embodiment.
(1) In the invention according to any one of claims 1 to 3, the pressing force applying means is formed by a spring, one end is fixed to the body, and the other end is in contact with the window glass. Is provided.

(2) In the invention described in claim 2, the actuator portion is configured to be movable integrally with the spring.
(3) In the invention described in the technical idea (1) or (2), the spring is a leaf spring.

  (4) In the invention described in the technical idea (1) or (2), the spring is a coil spring.

1A and 1B are schematic perspective views showing a rear portion of a passenger car, and FIG. 1B is a partial cross-sectional view in the vicinity of a right quarter window corresponding to a line BB in FIG. The schematic diagram of the state which the window glass cracked. The fragmentary sectional view near the quarter window on the right side in the second embodiment. The circuit diagram of a glass crack detection apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 13 ... Window glass, 16 ... Plate spring as a pressing force provision means, 17 ... Micro switch, 18 ... Actuator part, 24 ... Glass breakage detection apparatus, 30 ... Glass breakage detection part

Claims (3)

A glass crack detection device for an automobile window that uses a glass plate that cracks as a whole when a part of it is broken, for a window glass that cannot be opened and closed,
A pressing force applying means provided in a state where a pressing force with a strength capable of breaking a part of the window glass when the window glass is cracked is applied to the window glass;
It is provided corresponding to a portion that is broken by the action of the pressing force applying means, and further includes a glass breakage detection unit that changes the state due to breakage of the window glass and sets the glass breakage detection circuit to a detection state. Glass window detection device for automobile windows.   2. The automobile window according to claim 1, wherein the pressing force applying means is formed of a spring, the glass breakage detecting portion is an actuator portion of a microswitch, and is arranged to be operable in accordance with the breakage of the window glass. Glass breakage detector.   The glass breakage detecting device for an automobile window according to claim 1 or 2, wherein the pressing force applying means is provided at a location where the peripheral edge of the window glass is pressed.

Images