JP2003095070A - Heat ray sensor on-board burglar alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat ray sensor on-board burglar alarm which can sense a tricky intruder and give an alarm by narrowing a dead corner region as much as possible where an intruder can escape from being sensed by the heat ray sensor. SOLUTION: The heat ray sensor on-board burglar alarm which detects an intruder by using the heat ray sensor 5 sensing the temperature of an object and gives an alarm, is provided with reflecting sheets which are disposed at one or a plurality of positions in a cabin, and reflects heat ray, and the heat ray sensor 5 attached to the ceiling in the cabin or its periphery and the sensing direction of which is set so that a region including the reflecting seat becomes a sensing region, and a control means 17 which judges the existence of an intruder when there is a drastic rise in the temperature sensed by the heat ray sensor 5 and operates the alarm means 8, 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-wire theft alarm device using a heat ray sensor (also referred to as a pyroelectric sensor) for detecting an intruder and issuing an alarm to prevent the vehicle theft.

[0002]

2. Description of the Related Art In order to prevent a vehicle theft, an on-board theft alarm device that issues an alarm using various sensors has been put into practical use. For example, there are a type that an abnormal vibration of a parked vehicle is detected by a vibration sensor and an alarm is issued, and a type that a change in air pressure inside the vehicle due to opening and closing of a door is detected by a pressure sensor and an alarm is issued.

[0003]

As one of the on-board burglar alarms of this type, there is a method of detecting an intruder by using a heat ray sensor (pyroelectric sensor) capable of distinguishing the temperature of the human body from the ambient temperature. investigated. For example, a heat ray sensor is attached to the ceiling inside the vehicle or its surroundings, and its sensing direction is set to face the door. When a thief opens the door and enters the car, the heat ray sensor senses the human body and the sensed temperature rises. Based on this temperature rise, the control means (microcomputer) connected to the heat ray sensor determines the intrusion of a thief and activates alarm means such as a buzzer.

However, for example, when the door is opened and closed so that the thief hides behind it, even if the door is in the sensing area of the heat ray sensor, if the temperature is low, the temperature difference between the inner surface of the door and the outside (ground) is small. Since it is small, the temperature sensed by the heat ray sensor does not change significantly. Therefore, the opening / closing of the door is not detected and the alarm does not operate normally.

Further, in order to prevent both the intrusion from the front door and the intrusion from the rear door, a heat ray sensor is attached near the front end of the ceiling in the vehicle (for example, on a sun visor), and the sensing direction of the heat ray sensor is rearward and obliquely downward. It is possible to turn to. However, in this case, the rear side of the front seat becomes a so-called blind spot in the sensing area of the heat ray sensor. In other words, when the thief leans over and hides behind the front seat and enters through the rear door, the temperature sensed by the heat ray sensor does not change significantly and the alarm does not operate normally.

Therefore, the present invention provides a vehicle-type theft alarm device of the heat ray sensor type capable of narrowing the blind spot area where the heat ray sensor cannot detect an intruder as much as possible and issuing an alarm by detecting a cunning intruder. The purpose is to

[0007]

An on-board burglar alarm with a heat ray sensor according to the present invention detects the intruder by using a heat ray sensor for sensing the temperature of an object and issues an alarm. And a reflective sheet (for example, a metal film) that is arranged at one or more locations inside the vehicle and reflects heat rays, and is attached to the ceiling inside the vehicle or its surroundings, and the area including the reflective sheet becomes the sensing area. It is characterized by comprising a heat ray sensor whose sensing direction is set as described above, and control means for activating an alarm means when it judges that there is an intruder when the temperature sensed by the heat ray sensor rises sharply.

According to this structure, even when the intruder is hidden behind the obstacle and cannot be seen from the heat ray sensor,
Since the heat ray emitted from the intruder is reflected by the reflection sheet and is incident on the heat ray sensor, the sensing area of the heat ray sensor is widened, and the so-called blind spot area hidden by the obstacle is reduced. As a result, even a cunning thief who tries to enter the vehicle by hiding behind an obstacle can be detected and an alarm can be issued.

In a preferred embodiment, the reflection sheet is arranged on a front seat or a backrest thereof, the heat ray sensor is attached near a front end of a ceiling in a vehicle, and the reflection sheet is included in a sensing area of the heat ray sensor. Is set to the sensing direction of the heat ray sensor. According to such a configuration, even when the intruder hides behind the front door and opens and closes the front door, the heat ray emitted from the intruder is placed on the front seat or its backrest. Since the reflected light reaches the heat ray sensor and reaches the heat ray sensor, the control means can detect a sudden increase in the sensed temperature and activate the alarm means.

In another embodiment, the reflection sheet is arranged on a backrest portion or a headrest portion of a rear seat,
The heat ray sensor is attached near the front end of the ceiling in the vehicle, and the sensing direction of the heat ray sensor is set so that the reflection sheet is included in the sensing area of the heat ray sensor. According to this structure, even if an intruder bends over to hide behind the front seat and enters through the rear door, the heat rays emitted from the intruder are reflected on the backrest or headrest of the rear seat. Since it is reflected by the sheet and reaches the heat ray sensor, the control means can detect the sudden increase in the sensed temperature and activate the alarm means.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external view showing the structure of a heat ray sensor type on-board burglar alarm according to an embodiment of the present invention. This heat ray sensor-type on-board burglar alarm includes an alarm main body 1, a reflection sheet 2, and a remote controller (remote control) 3 for switching the alarm standby state on and off.

The alarm main body 1 has an electronic circuit including a heat ray sensor (also referred to as a pyroelectric sensor) and a microcomputer (control means) built in a substantially rectangular parallelepiped case 4. A mounting member 10 made of an elastic spring material is provided in parallel with the upper surface of the case 4, and its base end is fixed to the back surface of the case 4. The alarm body 1 is configured such that a sun visor (sunshade) above the front of the driver's seat or the passenger's seat (the peripheral edge of the ceiling) is sandwiched between the upper surface of the case 4 and the mounting bracket 10.
The case 4 can be fixed to the sun visor.

A reception window 6a for receiving an infrared signal from the remote controller 3 and a sensing window 5a for a heat ray sensor are provided on the front surface of the alarm device body 1. Also, at the bottom of the front,
An indicator unit 9 in which a plurality of light emitting diodes are arranged in a horizontal row is provided. Power is supplied to the alarm device body 1 from a vehicle-mounted battery via a cigarette lighter plug 27.

The reflection sheet 2 is preferably a thin metal film having a certain strength such as an aluminum wheel, but may be any one as long as it reflects heat rays emitted from the human body. The reflection sheet 2 is a front seat or a back portion thereof,
The headrest of the rear seat or the like is arranged at a position visible from the heat ray sensor (sensing window 5a) of the alarm device body 1 attached to the sun visor. For example, an adhesive layer and a protective sheet may be formed on the back surface of the reflective sheet 2, and the protective sheet may be peeled off to attach the reflective sheet 2 to the front seat or the like.

FIG. 2 is a view showing an example of installation of a heat ray sensor type onboard theft alarm device according to the embodiment of the present invention. In this example, the alarm body 1 is fixed to the passenger side sun visor near the front end of the ceiling in the vehicle as described above, and the reflection sheet 2 is attached to the front seat on the driver's side and its backrest. . The reflection sheet 2 may be attached to only one of the front seat and its backrest. The sensing direction of the heat ray sensor built in the alarm device main body 1 is set so that the sensing region includes the region to which the reflection sheet 2 is attached.

FIG. 3 is a view showing another example of installation of the heat ray sensor type onboard theft alarm device according to the embodiment of the present invention. In this example, the alarm main body 1 is fixed to the driver's seat side or the passenger's seat side sun visor near the front end of the ceiling in the vehicle as described above. Then, the reflection sheet 2 is attached to the headrest portion of the rear seat. The sensing direction of the heat ray sensor built in the alarm device main body 1 is set so that the sensing region includes the region to which the reflection sheet 2 is attached.

In the installation example shown in FIG. 2 or 3, the human body attempting to enter the vehicle is hidden behind the door or behind the front seat, and is in a blind spot which cannot be directly seen from the heat ray sensor (sensing window 5a). Even in such a case, there is a high possibility that the heat ray emitted from the human body will be reflected by the reflection sheet 2 and reach the heat ray sensor. Therefore, it is possible to detect a cunning thief attempting to enter the vehicle by hiding behind the door or behind the front seat and issue an alarm.

FIG. 4 is a block diagram of an electronic circuit built in the alarm device main body 1 and its surroundings. The electronic circuit built in the alarm device main body 1 is a microcomputer.
17, a heat ray sensor 5, a receiving circuit (remote control receiving circuit) 6 of the remote controller 3, an indicator unit 9 including a plurality of light emitting diodes 8, a secondary battery 26 and the like.

Power for operating the microcomputer 17 is supplied from the secondary battery 26 via the constant voltage circuit 29. The secondary battery 26 is charged from an in-vehicle battery (not shown) via a cigarette lighter plug 27 and a charging circuit 28. Further, a light emitting diode (LED) 35 for displaying the remaining charge amount of the secondary battery 26 and displaying during charging is provided.

As a peripheral circuit of the microcomputer 17, a reset circuit 31 for returning the operation to an initial state, an oscillation circuit 30 for generating a basic clock, an EEPROM (electrically erasable programmable ROM) for storing a control program and data. 32 is provided. As one of the alarm means, a buzzer circuit 33 that emits an alarm sound under the control of the microcomputer 17 is provided.

Next, the alarm operation controlled by the microcomputer 17 will be described with reference to the flow chart of FIG.

First, when the passenger parks the vehicle and leaves the vehicle, the passenger operates the remote controller 3 from outside the vehicle to shift the alarm body 1 to the alarm standby state. The signal emitted from the remote controller 3 is received by the remote controller receiving circuit 6 through the reception window 6a (see FIG. 1) of the alarm device body 1. By the control of the microcomputer 17 to which the signal is input, the alarm device main body 1 shifts from standby to system on, and the heat ray sensor 5
The alarm standby state (being alert) for monitoring the signal of is entered. At this time, the plurality of light emitting diodes 8 of the indicator unit 9 are lit and scanned to notify that the alarm standby state has been entered.

When an occupant gets in a car, the remote controller 3
Is operated from outside the vehicle to turn off the system of the alarm device main body 1, return to the standby state, and then board. In this way, the alarm buzzer does not ring.

In the alarm standby state, the heat ray sensor 5 incorporated in the alarm main body 1 monitors the temperature of the sensing area including the reflection sheet 2 attached to a predetermined position in the vehicle as described above. In this state (when the alarm device body 1 is not returned to the standby state), if a thief attempts to enter the vehicle (thief invasion), the human body enters the sensing area of the heat ray sensor 5 to detect the temperature of the heat ray sensor 5. Rises sharply. Even if the human body does not directly enter the sensing area of the heat ray sensor 5 as in the case where the thief tries to enter the inside of the vehicle by hiding behind the door or behind the front seat, the heat ray emitted from the human body reflects the heat ray. When reflected by 2 and reaches the heat ray sensor 5,
After all, the temperature sensed by the heat ray sensor 5 rapidly rises.

At this time, the microcomputer 17
Based on the abrupt change in the output signal of the heat ray sensor 5, it is determined that there is an intruder, and the buzzer circuit 33 is driven to emit an alarm sound by the buzzer. At the same time, the plurality of light emitting diodes 8 of the indicator section 9 are made to blink at once. In this way
By issuing a buzzer sound and an LED display alarm to intruders (thieves) who try to illegally enter the car,
It is possible to prevent car theft. This alarm continues for a fixed time (for example, 1 minute), and then returns to the alarm standby state (being alert).

The present invention is not limited to the above embodiment and can be implemented in various forms.

For example, regarding the installation location of the reflection sheet 2, it is possible to combine the installation example shown in FIG. 2 and the installation example shown in FIG. That is, the reflection sheet 2 is attached to the front seat or both the backrest portion and the headrest portion of the rear seat, and the detection direction of the heat ray sensor 5 incorporated in the alarm device main body 1 is set so that both reflection sheets 2 are in the detection area. It may be set to be included. This makes it possible to issue an alarm for both a cunning intrusion from the front door and a cunning intrusion from the rear door.

Further, the mounting position and mounting method of the alarm device body 1 are not limited to those shown in the embodiment, and for example, by means such as screwing or adhering to the ceiling surface or side surface (center pillar etc.) in the vehicle. You may fix it. Instead of incorporating the heat ray sensor 5 into the alarm device main body 1, the heat ray sensor 5 is separated from the alarm device main body 1 and fixed to the above-mentioned place, and the alarm device main body 1 is separately attached to a safe place. Good.

[0030]

As described above, in the on-board burglar alarm of the heat ray sensor type according to the present invention, by placing a reflection sheet such as a metal film at an appropriate place in the vehicle, an intruder can get an obstacle. Even if it is hidden and cannot be seen from the heat ray sensor, the heat ray emitted from the intruder is reflected by the reflection sheet and enters the heat ray sensor.
The sensing area is expanded, and the so-called blind spot area hidden by the obstacle is reduced. As a result, even a cunning thief who tries to enter the vehicle by hiding behind an obstacle can be detected and an alarm can be issued.

[Brief description of drawings]

FIG. 1 is an external view showing a configuration of a heat ray sensor-type on-board burglar alarm according to an embodiment of the present invention.

FIG. 2 is a diagram showing an installation example of a heat ray sensor type on-board burglar alarm according to the embodiment of the present invention.

FIG. 3 is a diagram showing another example of installation of the heat ray sensor type on-board theft alarm device according to the embodiment of the present invention.

FIG. 4 is a block diagram of an electronic circuit built in the alarm device main body and its surroundings.

FIG. 5 is a flow chart of an alarm operation controlled by a microcomputer.

[Explanation of symbols]

1 Alarm device body 2 reflective sheet 5 Heat ray sensor 8 Light emitting diode (alarm means) 17 Microcomputer (control means) 33 Buzzer circuit (alarm means)

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Claims (3)

[Claims] 1. An on-board burglar alarm device with a heat ray sensor for detecting an intruder by using a heat ray sensor for detecting the temperature of an object and issuing an alarm, wherein the heat ray sensor is arranged at one or a plurality of locations in a vehicle. And a reflective sheet that reflects the
A heat ray sensor whose sensing direction is set so that the area including the reflection sheet becomes a sensing area; and a control means for activating an alarm means by determining that an intruder is present when the temperature sensed by the heat ray sensor sharply rises. An on-board burglar alarm with a heat ray sensor, which is equipped with. 2. The reflection sheet is arranged on a front seat or a backrest thereof, the heat ray sensor is attached near a front end portion of a ceiling in a vehicle, and the heat ray sensor is included in a sensing area of the heat ray sensor. 2. The heat ray sensor type on-board theft alarm device according to claim 1, wherein a sensing direction of the sensor is set. 3. The heat ray sensor is arranged in a backrest portion or a headrest portion of a rear seat, the heat ray sensor is attached near a front end of a ceiling in a vehicle, and the heat ray sensor is included in a sensing area of the heat ray sensor. 2. The heat ray sensor type on-board theft alarm device according to claim 1, wherein a sensing direction of the sensor is set.