JP2009295109A - Window glass plate breakage detector for vehicle, window glass plate for vehicle, and anti-theft system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a window glass plate breakage detector for a vehicle for suppressing the increase in occupied area of a pattern even when a pattern is disposed on a window glass plate for a vehicle for radio communications and glass plate breakage detection. <P>SOLUTION: This window glass plate breakage detector is provided with a window glass plate 50 for a vehicle having a grand pattern 25 of an antenna element and an ECU 30 for detecting disconnection of the grand pattern 25. A first part 25c and second part 25b on the grand pattern 25 are separated from each other in an interval A capable of straddling the disconnection generated by the breakage of the window glass plate 50 for the vehicle. The ECU 30 detects the disconnection based on the variation of the signal that is detected using the first part 25c as a ground reference and is input from the second part 25b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle window glass plate breakage detection device that detects breakage of a vehicle window glass plate by a break in a pattern provided on the vehicle window glass plate, a vehicle window glass plate that enables detection of the breakage, The present invention also relates to a vehicle antitheft system that activates an antitheft function based on the detection result of the disconnection.

As a conventional technique, a glass breakage detection system capable of detecting breakage of glass is known (for example, see Patent Document 1). According to the disclosed content of Patent Document 1, in the glass breakage detection system, when the glass breaks, the glass sensing stub breaks, the length of the stub (electric length) changes, and the signal detected by the breakage detection unit Since the strength changes, the glass breakage is detected by detecting the change.
JP 2006-251909 A

  Incidentally, the vehicle window glass plate may be provided with both an antenna pattern 80 for wireless communication such as broadcast reception and a glass plate breakage detection dedicated pattern 90 as shown in FIG. However, when patterns are prepared for different purposes in this way, the number of patterns increases and the area occupied by the patterns on the glass plate increases.

  Therefore, the present invention provides a vehicle window glass plate breakage detection device that can suppress an increase in the area occupied by the pattern even if a pattern is provided on the vehicle windowpane plate for wireless communication and glass plate breakage detection. With the goal. Also provided are a vehicle window glass plate in which an increase in the area occupied by the pattern is suppressed, and a vehicle antitheft system capable of preventing the vehicle window glass plate from being illegally damaged while suppressing an increase in the area occupied by the pattern. With the goal.

In order to achieve the above object, a vehicle window glass sheet breakage detecting device according to the present invention is
A vehicle window glass plate provided with a ground pattern of an antenna element;
And a disconnection detecting means for detecting disconnection of the ground pattern.

Here, the first part and the second part on the ground pattern are parts separated from each other at an interval capable of straddling the disconnection caused by breakage of the vehicle window glass plate,
Preferably, the disconnection detecting means detects the disconnection by a change in a signal detected with the first part as a ground reference and input from the second part.

  Further, it is preferable that the first part and the second part exist at an end portion on the ground pattern.

  Further, it is preferable that the disconnection detecting means detects the disconnection by a change in the signal input via a detection resistor connected in series to the second part. Moreover, the said detection resistance is good to be attached to the compartment side of the said window glass board for vehicles.

  Moreover, it is preferable when the said space | interval is set to 15 mm or more. The antenna element may be an antenna pattern provided on the vehicle window glass plate. Preferably, the antenna pattern of the antenna element is an antenna pattern for broadcast reception (for example, for a vehicle acoustic system). Antenna pattern). Furthermore, it is preferable that the vehicle window glass is quarter glass.

  Further, it is preferable that the detection result of the disconnection by the disconnection detection unit is transmitted to a control unit that activates an anti-theft function based on the detection result.

Moreover, in order to achieve the said objective, the window glass plate for vehicles which concerns on this invention,
The ground pattern of the antenna element;
A detection element for transmitting a change in signal due to the disconnection of the ground pattern;
With
The ground pattern has a first part and a second part that are separated from each other by an interval that can cross the disconnection when the disconnection occurs,
The detection element has a first terminal, a second terminal, a third terminal, and a fourth terminal that are connection points with the outside, and the first terminal and the second terminal are electrically connected by wiring. The third terminal and the fourth terminal are electrically connected by wiring,
The second terminal is electrically connected to the second part, and the third terminal is electrically connected to the first part.

In order to achieve the above object, a vehicle antitheft system according to the present invention includes:
A vehicle window glass plate provided with a ground pattern of an antenna element;
Disconnection detecting means for detecting disconnection of the ground pattern;
Control means for operating a theft prevention function based on the detection result of the disconnection detection means.

Here, the determination means is provided in a place away from the vehicle,
It is preferable that the determination unit causes the anti-theft function to act on the vehicle by receiving a radio signal based on the detection result of the disconnection by the disconnection detection unit.

The determination means is provided in the vehicle,
It is preferable that the determination unit causes the anti-theft function to act on the vehicle by receiving a signal based on the detection result of the disconnection by the disconnection detection unit.

  ADVANTAGE OF THE INVENTION According to this invention, even if a pattern is provided in the window glass plate for vehicles for radio | wireless communication and a glass plate breakage detection, the increase in the area occupied by a pattern can be suppressed.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a vehicle window glass plate 50 and a pattern 20 provided on the vehicle window glass plate 50, which is a damage detection target of the vehicle window glass plate damage detection device according to the present invention. The window glass plate 50 for vehicles is what is called quarter glass provided in the side surface of the vehicle, for example. For example, the quarter glass is attached to a rear portion of the side surface of the vehicle from the entrance door, and is attached between the B pillar and the C pillar of the vehicle. Quarter glass is a relatively small glass among the window glass attached to the vehicle, so if the area occupied by the pattern is narrow, the effect is better than other glasses in terms of design and visibility. large. In addition, the quarter glass fixed to the vehicle has less vibration than the window glass attached to the door such as a passenger door, so that if the detection target of the glass plate breakage detection device is the quarter glass, the detection device is prevented from malfunctioning. In that respect, the effect is greater than the window glass associated with the door.

  The pattern 20 formed on the window glass plate 50 includes an antenna conductor 26 in which an antenna element is formed as a line conductor pattern, a power feeding portion 26 a that feeds power to the antenna conductor 26, and a ground for grounding the antenna conductor 26. Pattern 25. The pattern 20 is preferably formed on the edge of the window glass plate 50 in order to ensure visibility. For example, when the left side in FIG. 1 is the front side of the vehicle, the window glass plate 50 is formed at the front edge of the vehicle with the window glass plate 50 attached to the vehicle. Of course, in the state attached to the vehicle, you may form in the upper side edge part of the window glass plate 50, a lower side edge part, and a back side edge part.

  The shapes of the antenna conductor 26, the power feeding portion 26a, and the ground pattern 25 are determined according to the frequency band of the used radio wave. FIG. 1 shows an example of a tuned pattern as a high-frequency glass antenna, more specifically as an antenna for receiving a digital terrestrial digital broadcast (470 to 770 MHz) or UHF band analog TV broadcast frequency band. Show.

  The pattern 20 such as the ground pattern 25 is a printed conductor printed on the window glass plate 50. It is well known that printed conductors are used as defogger patterns to remove glass fogging. Note that the pattern 20 is not limited to a printed conductor, but may be a generally called conductor, for example, a metal plate or a metal foil.

  As shown in FIG. 1, the vehicle window glass plate breakage detecting device of the present embodiment shares the pattern for detecting breakage of the window glass plate 50 and the ground pattern 25 in an area indicated by 27. The occupation area is reduced. The ground pattern 25 is a rectangular pattern that is wider than the antenna conductor 26. The antenna conductor 26 is arranged on a center line or a substantially center line of a long side of the rectangle. By providing the common region 27 at the rectangular tip portion away from the center line, the function of the antenna as a ground can be prevented from being affected. In FIG. 1, the common area 27 is provided at one end of a rectangular shape. When the ground pattern 25 is formed so that the long side of the rectangle is in the vertical direction when the window glass plate 50 is attached to the vehicle, the common area 27 is provided at the lower end of the rectangular shape. If the common area 27 is provided at the lower end of the rectangular shape, the ECU 30, which is a means for detecting and determining disconnection described later, is installed below the vehicle body such as under the seat or in the console, Since the distance between the common area 27 and the ECU 30 is reduced, the length of the wire harness connecting them can be shortened.

  FIG. 2 is a configuration diagram of a vehicle window glass plate breakage detection apparatus 100 according to an embodiment of the present invention. The breakage detection apparatus 100 includes a window glass plate 50 provided with a ground pattern 25 and an electronic control unit (ECU) 30 that detects and determines disconnection of the ground pattern 25. Further, the breakage detection apparatus 100 includes a detection element 10 that incorporates a detection resistor 15. The detection element 10 is arranged in the common area 27 shown in FIG. 1 on the ground pattern 25.

  The detection element 10 is preferably attached to the passenger compartment side so that the presence of the detection element 10 can be visually confirmed from the outside of the vehicle while avoiding damage to the detection element 10 itself or unauthorized work. Being visible can make you hesitant to try to steal by breaking glass.

  The detection element 10 is a glass breakage detection terminal including a cover 11 that covers the detection resistor 15, a leg portion 12 (12a, 12b), and an attachment portion 13 (13a, 13b). The cover 11 protects the detection resistor 15 from external force and prevents erroneous detection of disconnection. Further, the detection resistor 15 can be easily attached to the window glass plate 50 by providing the leg portion 12 and the attachment portion 13. The detection element 10 includes terminals (first terminal 10a, second terminal 10b, third terminal 10c, and fourth terminal 10d) that are connection points with the outside. One end of the detection resistor 15 is electrically connected to the terminal 10a, and the other end of the detection resistor 15 is electrically connected to the terminal 10b. The terminal 10c and the terminal 10d are electrically connected by wiring.

  On the other hand, on the ground pattern 25, a terminal welded portion 25b (second portion) and 25c (first portion), which are portions where the detection element 10 is welded to the ground pattern 25, are provided. The terminal welded portions 25 b and 25 c are lands having the same potential as the ground pattern 25. The detection element 10 is fixed to the glass plate 50 by welding the attachment portion 13 and the terminal welded portions 25b and 25c. For example, it is welded by soldering or the like. Further, the detection element 10 is not limited to welding, and may be fixed to the glass plate 50 by fastening members such as bolts and nuts, for example.

  The terminal 10b is electrically connected to the ground pattern 25 by welding the mounting portion 13a and the terminal welding portion 25b, and the terminal 10c is connected to the ground pattern 25 by welding the mounting portion 13b and the terminal welding portion 25c. Electrically connected. That is, the detection resistor 15 is connected in series to the terminal 10b and is inserted in series in the path 25a on the ground pattern 25 between the terminal 10b and the terminal 10c.

  The terminal welded portions 25b and 25c (that is, the terminal 10b and the terminal 10c which are connection points between the ground pattern 25 and the detection element 10) are provided with a gap A therebetween. The interval A is set to such a length that a crack caused by breaking the glass plate 50 passes between the terminal welded portions 25b and 25c in order to detect disconnection of the ground pattern 20. That is, the terminal welded portions 25b and 25c are disposed at positions where the cracks are provided and the terminals 10b and 10c are electrically disconnected from each other by the cracks.

  The lower limit value of the distance A may be 15 mm or more, and more preferably 20 mm or more. The upper limit value of the interval A may be a length within a range in which the ground pattern 25 exists at a linear distance from the terminal welded portion 25c existing on the tip end side of the ground pattern 25 in the two portions. Although it is not necessary to make it longer than necessary, for example, it may be 30 mm or less. If the distance A is 15 mm or more, preferably 20 mm or more, it is possible to prevent disconnection from being detected because the crack does not pass between them.

  In addition, the width B of the short side of the rectangular ground pattern 25 is not less than the length for allowing the antenna to function normally, and cracks caused by breaking the glass plate 50 cause the width of the ground pattern 25 to be reduced. It is set to a length that completely crosses the direction. For example, the width B may be 3 mm or more and 15 mm or less, preferably 8 mm or more and 10 mm or less. If the width B is 3 mm or more, preferably 8 mm or more, the function of the antenna ground can be ensured. Further, if the width B is set to 15 mm or less, preferably 10 mm or less, it is possible to prevent disconnection from being detected because the crack does not completely cross, and to prevent the field of view from being blocked more than necessary.

  The detection element 10 is connected to the ECU 30 with a wire harness 41 connected to the terminal 10a and a wire harness 42 connected to the terminal 10d. The ECU 30 is disposed, for example, in the interior of the vehicle.

  The ECU 30 detects a change in signal by the detection resistor 15 electrically connected to the terminal welded portion 25b. That is, the ECU 30 detects a disconnection of the ground pattern 25 (path 25a) based on a change in a signal that is detected with the terminal welding portion 25c as a ground reference and is input from the terminal welding portion 25b. The terminal welded portion 25c is grounded to the ground of a circuit (built in the ECU 30) that detects disconnection of the path 25a via the terminal 10c, the terminal 10d, and the wire harness 42. By making the ground level of the disconnection detection circuit coincide with the ground level of the terminal welded portion 25c, malfunction of the disconnection detection circuit can be prevented.

  FIG. 3 is a circuit diagram of the vehicle glass sheet breakage detection device 100. The ECU 30 includes a disconnection detection circuit 35. The disconnection detection circuit 35 includes a power supply 35a (for example, an internal power supply such as a 5V power supply), a pull-up resistor 35b, a comparator 35c, and a reference voltage 35d (voltage generated by resistance voltage division or the like). This is a mold disconnection detection circuit. The microcomputer 39 is a determination unit that determines whether the window glass plate 50 is damaged. When the path 25a of the ground pattern 25 between the terminal 10b and the terminal 10c is disconnected, the input voltage input to the disconnection detection circuit 35 exceeds the reference voltage 35d, whereby the output of the comparator 35c is switched from L to H level. When the microcomputer 39 detects the H level, the microcomputer 39 determines that the window glass plate 50 is broken.

  FIG. 4 is a circuit diagram of a vehicle glass sheet breakage detection device 200 according to an embodiment of the present invention. The description of the same configuration as that of the damage detection apparatus 100 is omitted. Instead of the detection resistor 15 built in the detection element 10 described above, a detection resistor 16 built in the ECU 30 may be used. The detection element 10 may be omitted because it does not have the detection resistor 15 incorporated therein, but may be left to improve the attachment between the wire harnesses 41 and 42 and the ground pattern 25.

  FIG. 5 is a circuit diagram of a vehicle glass sheet breakage detection apparatus 300 according to an embodiment of the present invention. The description of the same configuration as that of the damage detection apparatus 100 is omitted. The disconnection detection circuit 37 is a current detection type disconnection detection circuit including a constant current source 37a, a detection resistor 17, and an AD converter 37c. Before the path 25a is disconnected, the AD converter 37c outputs a constant first voltage X1 due to the voltage generated by the detection resistor 17. When the path 25a is disconnected, no current flows and no voltage is generated by the detection resistor 17, so that the output voltage of the AD converter 37c becomes a second voltage value X2 (for example, zero) lower than the first voltage value X1. When the microcomputer 39 detects the second voltage value X2, it determines that the window glass plate 50 is broken.

  Therefore, according to the above-described embodiment, even if a pattern is provided on the window glass plate for a vehicle for broadcast reception and glass plate breakage detection, an increase in the area occupied by the pattern can be suppressed. If the occupied area is reduced, it is advantageous in terms of ensuring visibility and design. Further, the cost can be reduced by sharing the pattern. Since the pattern can be shared, for example, as shown in FIG. 6, compared to the case where the window glass plate breakage detection dedicated pattern 90 is provided, the wire breakage detection pattern 91 and the pattern 91 and the wire harness ( The connection patterns 92 and 93 (not shown) can be deleted.

  Further, as shown in FIG. 2, a vehicle antitheft system is conceivable as a system including the damage detection device 100 and the antitheft device 5 that activates the antitheft function based on the detection result of the damage detection device 100. . ECU30 transmits the disconnection detection signal showing having detected disconnection. The anti-theft device 5 is a computer that receives a disconnection detection signal from the ECU 30 and regards the disconnection as being caused by an illegal act, and determines that the disconnection is a breakage of the window glass plate 50 due to the illegal act. That is, when receiving the disconnection detection signal, the antitheft device 5 determines that an illegal act of damaging the window glass plate 50 has been performed.

  The anti-theft device 5 performs anti-theft control for anti-theft operations such as alarm, warning display, prohibition of engine start, transmission of anti-theft detection signal, blinking of hazard lamps, forced lock operation, illegal photographing, etc. . The anti-theft device 5 includes a storage device including a CPU that executes a program for controlling the anti-theft operation, a ROM that stores these programs, and a RAM that temporarily stores calculation results of the programs. ing.

  The anti-theft device 5 may be installed in a vehicle or installed in a place away from the vehicle (for example, a house, a roadside device, an information management center, etc.).

  When the anti-theft device 5 is mounted on a vehicle, the anti-theft device 5 causes the anti-theft function to act on the vehicle by receiving a disconnection detection signal from the ECU 30 via a wire harness in the vehicle.

  When the anti-theft device 5 is installed at a location away from the vehicle, the anti-theft device 5 receives the disconnection detection signal from the in-vehicle ECU 30, and thereby the vehicle equipped with the ECU 30 that has transmitted the disconnection detection signal. Activate the anti-theft function. The ECU 30 may perform wireless communication with the anti-theft device 5 through wireless communication means that can communicate with the outside of the vehicle. The anti-theft device 5 performs an anti-theft operation on the vehicle by transmitting a command signal for performing the anti-theft operation to the vehicle.

  Therefore, with such a vehicle antitheft system, an increase in the area occupied by the pattern provided on the window glass plate 50 is suppressed, and the window glass plate 50 is illegally damaged, thereby unlocking, entering the vehicle, and without permission. The use, theft of the vehicle itself and the vehicle interior goods can be suppressed.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, in the above-described embodiment, the antenna conductor 26 formed by using the antenna element as a pattern is illustrated, but the antenna conductor 26 may be an antenna element that is not formed on the window glass plate (not a printed conductor). Moreover, although the antenna pattern suitable for broadcast reception was illustrated, if it is wireless communication which requires a ground pattern, it may not be restricted to the ground pattern of a broadcast reception antenna. For example, the ground pattern of the antenna for a broadcast receiver such as an in-vehicle television or radio of the vehicle acoustic system is not limited to the ground pattern of the antenna for a telephone in the 800 MHz band or 1.5 GHz band.

  For example, in the above-described embodiment, the window glass plate 50 is quarter glass, but it may be windshield, side glass, and rear glass.

It is the figure which showed the window glass board 50 for vehicles which is a damage detection object of the window glass plate breakage detection apparatus for vehicles which concerns on this invention, and the pattern 20 provided in it. 1 is a configuration diagram of a vehicle window glass plate breakage detection device 100 according to an embodiment of the present invention. 1 is a circuit diagram of a glass plate breakage detection device 100 for a vehicle. It is a circuit diagram of glass plate breakage detection device 200 for vehicles which is one embodiment of the present invention. It is a circuit diagram of glass plate breakage detection device 300 for vehicles which is one embodiment of the present invention. It is an example of the window glass for vehicles provided with both the pattern for damage detection, and an antenna pattern.

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 Anti-theft device 10 Detection element 15, 16, 17 Detection resistance 25, 85 Ground pattern 26, 86 Antenna conductor 26a, 87 Feed part 30 ECU
35, 37 Disconnection detection circuit 39 Microcomputer 41, 42 Wire harness 50 Window glass plate 80 Radio communication dedicated antenna pattern 90 Window glass plate breakage detection dedicated pattern 100, 200, 300 Vehicle window glass plate breakage detection device

Claims (18)

A vehicle window glass plate provided with a ground pattern of an antenna element;
A vehicle window glass plate breakage detection device comprising: a breakage detection means for detecting breakage of the ground pattern. The first part and the second part on the ground pattern are parts separated from each other at an interval capable of straddling the disconnection caused by breakage of the vehicle window glass plate,
2. The vehicle window according to claim 1, wherein the disconnection detection means detects the disconnection by a change in a signal detected with the first part as a ground reference and input from the second part. 3. Glass plate breakage detector.   The vehicle window glass plate breakage detection device according to claim 2, wherein the first portion and the second portion are present at an end portion on the ground pattern. The disconnection detecting means is
The vehicle window glass plate breakage detection device according to claim 2 or 3, wherein the disconnection is detected by a change in the signal inputted through a detection resistor connected in series to the second part.   The vehicle window glass plate breakage detection device according to claim 4, wherein the detection resistor is attached to a vehicle compartment side of the vehicle window glass plate.   The vehicle window glass plate breakage detecting device according to any one of claims 2 to 4, wherein the interval is set to 15 mm or more.   The vehicle window glass plate breakage detecting device according to any one of claims 1 to 6, wherein the antenna element is an antenna pattern provided on the vehicle window glass plate.   The vehicle window glass plate breakage detection device according to claim 7, wherein the antenna pattern of the antenna element is an antenna pattern for broadcast reception.   9. The vehicle window glass plate breakage detection device according to claim 8, wherein the antenna pattern of the antenna element is a broadcast reception antenna pattern for a vehicle acoustic system.   The vehicle window glass plate breakage detection device according to any one of claims 1 to 9, wherein the vehicle window glass is quarter glass.   The vehicle window glass plate breakage detection device according to any one of claims 1 to 10, wherein a detection result of the breakage by the breakage detection unit is transmitted to a control unit that activates an anti-theft function based on the detection result. The ground pattern of the antenna element;
A detection element for transmitting a change in signal due to the disconnection of the ground pattern;
With
The ground pattern has a first part and a second part that are separated from each other by an interval that can cross the disconnection when the disconnection occurs,
The detection element has a first terminal, a second terminal, a third terminal, and a fourth terminal that are connection points with the outside, and the first terminal and the second terminal are electrically connected by wiring. The third terminal and the fourth terminal are electrically connected by wiring,
The window glass plate for a vehicle, wherein the second terminal is electrically connected to the second part, and the third terminal is electrically connected to the first part. .   The vehicle window glass plate according to claim 12, wherein the first part and the second part are present at an end portion on the ground pattern.   The vehicle window glass plate according to claim 12, further comprising a detection resistor connected in series in a wiring that electrically connects the first terminal and the second terminal.   15. The vehicle window glass plate according to any one of claims 12 to 14, wherein the detection element is attached to a vehicle compartment side of the vehicle window glass plate. A vehicle window glass plate provided with a ground pattern of an antenna element;
Disconnection detecting means for detecting disconnection of the ground pattern;
A vehicle antitheft system comprising: a control unit that activates an antitheft function based on a detection result of the disconnection detecting unit. The control means is provided at a location away from the vehicle,
The vehicle anti-theft system according to claim 16, wherein the control means causes the anti-theft function to act on the vehicle by receiving a radio signal based on a detection result of the disconnection detecting means. The control means is provided in the vehicle,
The vehicle antitheft system according to claim 16, wherein the control means causes the antitheft function to act on the vehicle by receiving a signal based on the detection result of the disconnection by the disconnection detecting means.

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