JPH01237900A - Burglarproof device for vehicle - Google Patents

Abstract

PURPOSE:To rapidly alarm illegal invasion to a vehicle caused by breaking window glass by emitting an ultrasonic wave toward the window glass, and receiving a reflected wave. CONSTITUTION:An ultrasonic wave unit 2 is attached to the room side of the roof 1 of the vehicle. The ultrasonic wave emitted from the wave transmission part of the ultrasonic wave unit 2 is reflected on window glass 4, front glass 5, and window glass 6, and is received at the wave reception part of the ultrasonic wave unit 2. When the window glass 4 and 6 or the front glass 5 are broken and the state change of the ultrasonic wave is detected at the wave reception part, an alarm is issued.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle anti-theft device for detecting breakage of a window glass disposed in, for example, a driver's seat portion of a vehicle.

(Prior art) Conventionally, as this type of anti-theft device, for example,
The one described in Japanese Patent No. 8-23364 is known. According to this, a device that houses an ultrasonic wave transmitting part (transmitter) and a wave receiving part (receiver) in the same housing,
When the casing is installed in the vehicle interior and a predetermined switch is externally operated in an empty vehicle state, the interior of the vehicle is filled with ultrasonic waves from the front delivery wave section, and when a change in the frequency or amplitude of the ultrasonic waves is detected, an alarm section is activated. Disclosed is a system for operating the system.

(Problem to be solved by fr3mei) However, according to the +1 component of the conventional technology, the ultrasonic waves from the wave transmitter (transmitter) are emitted toward the interior of the vehicle. Due to physical fluctuations, such as unavoidable changes in the vehicle interior such as an increase or decrease in the amount of luggage on the seat or the tilting of the seat, it is difficult to achieve a constant ultrasonic detection state at all times, which poses a problem in versatility. Further, since the conventional configuration does not directly detect the condition of the window glass, it is difficult to determine whether or not the vehicle interior has been invaded.

The present invention has been made in order to solve such conventional problems, and is a vehicle vandalism prevention device that can detect illegal intrusion into a circle and prevent theft using only the relationship between ultrasonic waves and window glass. The purpose is to provide

(Means for Solving the Problems) In order to achieve the above object, the present invention transmits ultrasonic waves from a wave transmitting unit toward one end of a plurality of window glasses disposed on a vehicle body, In addition, the ultrasonic wave reflected from the window glass at one end is sequentially reflected from the adjacent window glass, and a wave receiving unit that receives the ultrasonic wave reflected from the window glass at the final end is connected to the vehicle together with the wave transmitting unit. The present invention is characterized in that an alarm unit is installed indoors and is activated when the wave receiving unit detects a change in the state of the ultrasonic wave.

(Function) When the car is empty with the window glass fully closed, ultrasonic waves begin to be emitted from the wave transmitter, and the emitted ultrasonic waves are reflected by one end of the window glass (for example, the driver's side window glass), and then transmitted to the next window glass. (
toward the windshield), and the last windowpane (
The ultrasonic waves reflected from the assist side window glass head toward the wave receiving section. Therefore, if any of the window glass is broken, the receiving condition of the ultrasonic waves received by the wave receiving section changes.
1 reporting section is activated. Of course, in this case, even if an illegal intrusion occurs through a window glass other than the window glass that is hit by the ultrasonic waves, the alarm section will be activated due to a change in the receiving state due to the interruption of the ultrasonic waves at the time of the intrusion.

(Embodiment) Fig. 1 shows an embodiment of the present invention, in which an ultrasonic unit 2 is attached to the interior side of the roof l of an automobile (for example, the position where a room lamp is attached). The ultrasonic waves from the wave transmitting section described in detail are transmitted toward the window glass 4 of the driver side door 3, and the ultrasonic waves reflected from the window glass 4 are directed toward the windshield 5 and reflected from the windshield 5. The ultrasonic waves are directed towards the window glass 6 of the assist side door,
The ultrasonic waves reflected by the window glass 6 are transmitted to the ultrasonic unit 2.
It is received by the wave transmitting section, which will be explained in detail later. That is, the ultrasonic waves are transmitted in a loop using each window glass 4, 5, 6 as a reflecting surface.

As shown in FIG. 2, the ultrasonic unit 2 in this embodiment is mounted on a unit base 2A with a wave transmitting section 2a and a wave receiving section 2b provided at a predetermined interval on a protrusion 2B. The wave transmitting surfaces of the wave section 2a and the wave receiving section 2b and the wave receiving section 2d (see FIG. 3) can be freely set in desired directions. here,
The unit base 2A is fixed between the roof 1 and the base 7a to which the room lamp 7 is attached, but this fixing may be done when the room lamp 7 is attached to the roof 1, or it may be attached after interior decoration. Good too.

FIG. 4 shows a wave transmitting section 2a and a wave receiving section 2b of the ultrasonic unit 2.
This figure shows a processing circuit related to this. The intermittent oscillation circuit 9 constituting the wave transmitting section 2a transmits the signal from the wave transmitting element 10 at a predetermined period T (for example, 25 m5ec).
5ec) (that is, with a duty ratio t/T), the ultrasonic signal of a predetermined frequency is intermittently emitted (f), and the wave receiving element 11 constituting the wave receiving section 2b has an output that is transmitted to the amplifier circuit 1.
2 with a predetermined gain (for example, 50.dT3).

The output of the amplifier circuit 12 is detected by a detection circuit 13 and smoothed by a filter circuit 14.
The output of 4 is supplied to the determination circuit 15. This judgment circuit 1
5 compares the previous signal state with the current signal state, and outputs a determination pulse when a change occurs.

This judgment pulse is supplied to the output circuit 16, and the alarm section 17
(e.g. intermittent horn sound, flashing headlights, etc.). In other words, the alarm section 17 is activated due to a disturbance in the transmission cycle of ultrasonic waves due to illegal entry or the like.

With this structure, when a passenger leaves the car, for example, when the driver side door 3 is closed by pushing the lock knob on the inside of the door while pulling the door handle 8 toward you (performing a so-called keyless lock), Power is supplied to the sonic wave unit 2, and the wave transmitting section 2a starts transmitting ultrasonic waves.

The emitted ultrasonic waves are reflected by the window glass at one end (driver side window glass 4 in this example), then directed to the next window glass (windshield 5), and then reflected from the window glass at the final end (driver side window glass 4). 6) The ultrasonic waves reflected at the receiving part 2b
Head to. In this case, if any of the window glasses 4, 5, 6 is broken, the ultrasonic waves received by the wave receiving unit 2b change, so that the alarm unit 17 is activated.

In this case, if the window glass on the rear seat side is broken and illegal entry is made into the car, for example, valuables on the front seat or car body parts and accessories are stolen, ultrasonic waves will be blocked, etc. The reception state of the ultrasonic waves by the wave receiving section 2b changes and the alarm section 17 is activated.

In this embodiment, the ultrasonic wave from the wave transmitter 2a is configured to be transmitted intermittently, but it may be transmitted continuously. Further, although the wave transmitting section 2a and the wave receiving section 2L+ are configured to be attached to the room lamp 7, they may be configured to be attached to other predetermined parts within the vehicle interior.

(Effects of the Invention) As described above, according to the present invention, ultrasonic waves are transmitted from the wave transmitting unit toward the window glass at one end of a plurality of window glasses disposed on the vehicle body, and The ultrasonic wave reflected by the window glass of the window is successively reflected by the adjacent window glass, and a wave receiving part for receiving the ultrasonic wave reflected by the last window glass is provided in the vehicle interior together with the wave transmitting part, Since the configuration includes an alarm section that is activated when the wave receiving section detects a change in the state of the ultrasonic wave, it is possible to easily prevent illegal entry into the vehicle interior due to window glass breakage by prompt activation of the alarm section. Moreover, since the reception of ultrasonic waves uses reflections from window glass, the reception status will not be affected by unavoidable changes in the vehicle interior, such as the increase or decrease of luggage on the seat or the tilting of the seat. Furthermore, even if an illegal intrusion into the vehicle occurs through another window glass that does not contribute to the reflection of ultrasonic waves, a change in the ultrasonic reception state can be immediately detected and an alarm can be issued. Note that if the ultrasonic wave transmission from the wave transmitting unit is performed intermittently, the power consumption of the wave transmitting unit and the like can be reduced compared to the case where the ultrasonic wave is transmitted continuously.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the configuration of main parts when an embodiment of the present invention is applied to an automatic system, and Fig. 2 shows an ultrasonic unit with a wave transmitting part and a wave receiving part attached, and an illustration thereof] Figure 3 is a perspective view showing the overall configuration of a room lamp.
FIG. 4 is a side view showing the installed state of the ultrasonic unit along line ll-[1, and FIG. 4 is a circuit diagram for processing ultrasonic signals. 2a... Wave transmitting section, 2b... Wave receiving section, 4.5.6...
・Window glass, 18...Alarm section. Applicant: Honda Lock Co., Ltd.

Claims (2)

[Claims] 1. A transmitter emits ultrasonic waves toward one end of a plurality of window glasses arranged on the vehicle body, and the ultrasound reflected from the one end of the window glass is sequentially transmitted to the adjacent window glass. A wave receiving unit for receiving the ultrasonic waves reflected by the last window glass is provided in the vehicle interior together with the wave transmitting unit, and the wave receiving unit is activated when a change in the state of the ultrasonic waves is detected. A vehicle anti-theft device characterized by having an alarm section. 2. Claim 1: The wave transmitting unit transmits ultrasonic waves intermittently.
Anti-theft device for the vehicle mentioned.