JP2002042256A - Trespass detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive and simple-constitution trespass detector surely detecting the trespass of a suspicious person into a monitor object area by excluding malfunction factors due to small animals. SOLUTION: An ultrasonic transducer installed in the monitor object area is driven to send the ultrasonic wave [40 kHzl to the monitor object area, a reflection signal of the ultrasonic wave in the monitor object area is received via the ultrasonic transducer, and the presence of foreign body in the monitor object area is detected from its reflection characteristics (first means). The ultrasonic transducer is driven as a substitute for the first means to send the ultrasonic wave [20 kHz] hated by the small animals to the monitor objection area go as to exclude the small animals entering into the monitor object area (second means).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intrusion detecting device capable of reliably detecting foreign matter, particularly a suspicious person, from entering a predetermined monitoring target area such as a warehouse or an office.

[0002]

[Related Background Art] Various types of intrusion detection devices that detect intrusion of a suspicious person into a warehouse or office at night or on holidays using infrared rays or laser beams, as well as those using ultrasonic waves, have been developed. Have been. Incidentally, an intrusion detection device using infrared light or laser light basically forms a light transmission / reception wave path spatially in the monitoring target area, and when the light path is interrupted by a foreign substance, It is configured to detect that In addition, an intrusion detection device using ultrasonic waves generally transmits an ultrasonic wave to a monitoring target area and receives a reflected wave thereof. When an intruder is present, the transmitted wave of the ultrasonic wave transmits the reflected wave. It is configured to detect the intrusion by utilizing the fact that the time required for reception changes.

[0003]

By the way, small animals such as rats and cats often enter a warehouse or office, and an alarm may be issued by detecting the invasion of these small animals. Therefore, in order to distinguish the intrusion of a suspicious person from the invasion of a small animal, for example, a light transmission / reception path spatially formed in the monitoring target area is set at a height position that is not blocked by the small animal, or A device such as adjusting a determination threshold value for a reflected wave of a sound wave is employed. However, it is very troublesome to take such measures, and it is unavoidable that the configuration becomes complicated and a trouble such as an expensive security system occurs.

The present invention has been made in view of such circumstances, and an object of the present invention is to eliminate a malfunction of a small animal simply and surely and to ensure that a suspicious person intrudes into a predetermined monitoring target area. It is an object of the present invention to provide an intrusion detection device having a low cost and a simple configuration which can be detected at a low cost.

[0005]

In order to achieve the above-mentioned object, an intrusion detection device according to the present invention makes effective use of an ultrasonic transducer installed with its ultrasonic wave transmitting / receiving surface directed to a predetermined monitoring target area. By driving the ultrasonic transducer and transmitting ultrasonic waves to the monitoring target area, receiving a reflected signal of the ultrasonic waves in the monitoring target area via the ultrasonic transducer,
First means for detecting the presence of a foreign substance in the monitoring target area from the reflection characteristics, and driving the ultrasonic transducer in place of the first means to generate a sound wave of a predetermined frequency that the small animal dislikes in the monitoring target area; Second means for transmitting small waves and excluding small animals that have entered the monitoring target area.

In other words, the intrusion detection device according to the present invention provides an ultrasonic transducer installed on a ceiling or the like of a monitoring target area by using a first mode for detecting the intrusion of a suspicious person in the monitoring target area, and the monitoring target. By selectively driving each of the small animals in the second mode for eliminating small animals that have invaded the area, the apparatus is configured to monitor entry of a suspicious person while eliminating small animals using ultrasonic waves.

[0007] Preferably, the first and second means are alternately driven at a predetermined cycle, and the intrusion detection of a suspicious person is performed while small animals are excluded. Further, the first and the second are as described in claim 3.
The means are configured to drive the ultrasonic transducer at different frequencies from each other. Incidentally, when detecting the intrusion of a suspicious person, for example, an ultrasonic wave of 40 kHz is used, and when excluding a small animal, an ultrasonic wave of 20 kHz is used.

Preferably, in the second means, the driving frequency and / or the driving time of the ultrasonic transducer is changed to change the transmission form of the sound wave of the predetermined frequency. This prevents the small animal from getting used to the sound wave of the predetermined frequency, thereby preventing the small animal exclusion ability from lowering.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an intrusion detection device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an example of a monitoring target area in which an intrusion detection device is installed, and shows a room used as an office. The ultrasonic transducer 1 that transmits an ultrasonic wave to such a predetermined monitoring target area and receives the reflected wave is installed on, for example, a ceiling part 2 with its ultrasonic transmission / reception surface facing the monitoring target area. When the ultrasonic wave transmitted and received by one ultrasonic transducer 1 has a narrow spread angle, a plurality of ultrasonic transducers 1 having different directing directions may be used in parallel.

Now, such an ultrasonic transducer 1
The intrusion detection device that drives the device to monitor the intrusion of a suspicious person into the monitoring target area is configured as shown in FIG. 2, for example. The intrusion detection device shown in FIG. 2 drives the ultrasonic transducer 1 at a frequency of 40 kHz to detect the intrusion of a suspicious person, and drives the ultrasonic transducer 1 at 20 kHz.
It is configured to be driven at the frequency of Hz to eliminate small animals such as rats and cats.

That is, as shown in FIG. 2, the intrusion detection device includes an oscillator 11 which oscillates a signal f1 having a frequency of 40 kHz.
And a frequency divider 12 for dividing the signal f1 by １ ／ to generate a signal f2 having a frequency of 20 kHz. These signals f1 and f2 are selectively supplied to a drive circuit 15 through gate circuits 13 and 14, and are used for driving the ultrasonic transducer 1 by the drive circuit 15.

A control circuit 16 for selectively driving the gate circuits 13 and 14 operates by receiving a clock signal CK generated by dividing the signal f2 by n through a frequency divider 17. The gate circuits 13 and 14 are alternately opened at predetermined time intervals at predetermined intervals to selectively drive the ultrasonic transducer 1. As a result, an ultrasonic wave having a frequency of 40 kHz or an ultrasonic wave having a frequency of 20 kHz is selectively pulse-transmitted from the ultrasonic transducer 1 toward the above-described predetermined monitoring target region.

After transmitting the above-mentioned ultrasonic wave having a frequency of 40 kHz, the control circuit 16 drives a receiver 18 to receive a reflected wave of the ultrasonic wave in the monitored area via the ultrasonic transducer 1. are doing. Then, the reflection characteristics of the received ultrasonic waves are examined by the intrusion detector 19, and more specifically, the difference between the reflection characteristics in the steady state and the reflection characteristics of the ultrasonic waves received at that time is examined to check the monitoring target. The presence or absence of foreign matter in the area is determined.

More specifically, the control circuit 16 opens the gate circuit 13 over a first period T1 (for example, 1 mSec) as shown in FIG. 3 to transmit and drive the ultrasonic transducer 1 at a frequency of 40 kHz. An ultrasonic wave of 40 kHz is transmitted from the ultrasonic transducer 1. After that, the reflected wave of the ultrasonic wave in the monitoring target area is transmitted to the ultrasonic transducer 1 through the ultrasonic transducer 1 for a second period T2 (for example, 5 seconds).
mSec), and drives the intrusion detector 19 to execute detection processing for the intrusion of a foreign substance into the monitoring target area based on its reflection characteristics.

Thereafter, the control circuit 16 controls the third period T3
The gate circuit 14 is opened over (for example, 100 mSec), the ultrasonic transducer 1 is driven to transmit at a frequency of 20 kHz, and the ultrasonic transducer 1 transmits an ultrasonic wave of 20 kHz. This 20 kHz ultrasonic wave is in a sound range (frequency) that small animals such as rats and cats dislike.
Small animals that have entered the monitoring target area are eliminated using ultrasonic waves of this frequency.

Thus, as described above, the ultrasonic transducers 1 are alternately driven at different driving frequencies,
According to the intrusion detection device configured to detect the intrusion of a suspicious person from the reflection characteristics in the monitored area using the ultrasonic waves of 40 kHz, while removing small animals from the monitored area using the ultrasonic waves of 20 kHz. Thus, the intrusion of a suspicious individual can be reliably detected without bothering small animals such as rats and cats. In particular, since the ultrasonic transducer 1 for intrusion detection is used as it is as an ultrasonic sound source for eliminating small animals, the intrusion monitoring device can be simply and inexpensively constructed without increasing the equipment cost.

By the way, as shown in FIG.
Using signals 2a and 12n, signals f2 and fn + 1 composed of a plurality of frequencies that small animals of different types dislike each other are generated, and these signals f2 and fn + 1 are converted to gate circuits 14a and 14n.
To 14n are selectively extracted to drive the ultrasonic transducer 1 so that the ultrasonic transducer 1
The frequency of the sound wave transmitted from the transmitter may be changed.
At this time, the driving time of the ultrasonic transducer 1 is
It may be changed at any time.

That is, while a certain kind of small animal dislikes ultrasonic waves of a specific frequency, another kind of small animal may not dislike that frequency. In addition, although a small animal generally dislikes ultrasonic waves of a certain frequency, there is a possibility that the small animal may not dislike the frequency as the small animal gets used to the environment. Therefore, it is assumed that the effect is gradually diminished if the small animal repeatedly emits the ultrasonic wave of the frequency that dislikes.

Therefore, the present apparatus is configured to change the transmission pattern (mode of transmission) of ultrasonic waves (sound waves) hated by small animals, for example, at a predetermined cycle. Specifically, the drive frequency of the ultrasonic transducer 1 during the period of excluding small animals is periodically changed as shown in FIG. 5A, or the drive time is changed as shown in FIG. 5B. It is done by doing. Also, as shown in FIGS. 5 (c) and 5 (d), by changing the driving form of the ultrasonic transducer 1 itself, the transmission form of the ultrasonic wave (sound wave) used for eliminating small animals is changed as needed. . FIG. 5 (c) shows an example in which two types of small animals are eliminated by emitting two types of ultrasonic waves having different frequencies within a predetermined time. FIG. 5D shows a mode in which the ultrasonic transducer 1 is simultaneously driven at two different frequencies to emit a so-called undulating ultrasonic wave between these frequencies.

Thus, the mode of the ultrasonic wave transmitted from the ultrasonic transducer 1 is changed, for example, at a predetermined cycle or at random, so as to exclude small animals that have entered the predetermined monitoring target area. For example, not only small animals of a specific type but also some small animals of different types can be effectively eliminated. Moreover, it is possible to eliminate small animals without causing the user to become accustomed to ultrasonic waves. Specifically, for cats, 30-40k
Ultrasound of Hz, and 15-20kHz for rats
The ultrasonic waves having different frequencies are used in combination, and the ultrasonic waves having different frequencies are appropriately combined and transmitted to a predetermined monitoring target area, thereby excluding cats and rats. As for the mole, a sound wave of, for example, about 350 Hz may be transmitted. Also, if a sound wave of a frequency that the small animal dislikes is transmitted according to the type of the small animal in this way, for example, although it is slightly different from the original function of removing small animals in invasive substance monitoring, cockroaches and mosquitoes Can be effectively eliminated.

The period for changing the transmission form of the sound wave of the frequency that the small animal dislikes is changed to the transmission period of the ultrasonic wave for monitoring the intrusion of the suspicious person as described above.
It is also possible to change on a daily, weekly or monthly basis. Alternatively, the sound waves in a frequency band that is disliked by a plurality of small animals may be transmitted continuously or intermittently while being swept.

The present invention is not limited to the above embodiment. In the embodiment described above, 40k
Two types of ultrasonic waves consisting of Hz and 20 kHz are selectively generated, but only the ultrasonic waves in the frequency band (20 kHz) that small animals dislike are used to eliminate small animals and detect intrusion of suspicious persons. Can be performed simultaneously. In this case, the processing of receiving the reflected wave of the ultrasonic wave and examining the reflection characteristic is repeatedly executed. When no invading object is detected after a predetermined time (for example, after one second), it is determined that the small animal has escaped by the ultrasonic wave. What is necessary is just to determine that it is a suspicious person (human) who does not feel an ultrasonic wave, and to issue an alarm.

It is of course possible to provide an independent oscillator having a different oscillation frequency as a drive circuit for the ultrasonic transducer 1, and the frequency of the ultrasonic wave to be used may be determined according to its use. is there. Further, in the above-described embodiment, the ultrasonic transducer 1
Although the control system for controlling the drive of the microcomputer is constituted by hardware, it is of course possible to control the microcomputer by software using a microcomputer. In addition, the present invention can be variously modified and implemented without departing from the gist thereof.

[0024]

As described above, according to the present invention, an inexpensive ultrasonic transducer is effectively used as a sound source of ultrasonic waves hated by small animals, and a suspicious person enters a predetermined monitoring target area. Since it is used as a sensor for detection,
Malfunctions caused by small animals can be prevented, and intrusion of a suspicious person can be reliably detected. Moreover, it can be realized as an inexpensive intrusion detection device having a simple configuration and a great advantage in practical use.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a monitoring target area to be detected by an intruder.

FIG. 2 is a schematic configuration diagram of a main part of an intrusion detection device according to an embodiment of the present invention.

FIG. 3 is a timing chart showing an operation example of the intrusion detection device shown in FIG. 2;

FIG. 4 is a schematic configuration diagram of a main part of an intrusion detection device according to an embodiment of the present invention.

FIG. 5 is a diagram showing a mode in which ultrasonic waves (sound waves) disliked by small animals are changed.

[Explanation of symbols]

 Reference Signs List 1 ultrasonic transducer 11 oscillator (signal f1; 40 kHz) 12 frequency divider (signal f2; 20 kHz) 13, 14 gate circuit 15 drive circuit 16 control circuit 17 frequency divider 18 receiver 19 intrusion detector

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yuki Utaka 2-17-2 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa F-term in Hyper Electronics Co., Ltd. 2G005 AA04 5C084 AA02 AA08 BB05 CC19 DD02 DD04 EE01 EE04 GG07 GG09 GG33 GG37 GG43 GG44 GG56 GG57 GG68 GG72 GG74 HH01

Claims (4)

[Claims] An ultrasonic transducer provided with a transmitting / receiving surface of an ultrasonic wave directed toward a predetermined monitoring target area, an ultrasonic transducer being driven by driving the ultrasonic transducer, and transmitting an ultrasonic wave to the monitoring target area. A first means for receiving a reflected signal of the ultrasonic wave in the area via the ultrasonic transducer, and detecting the presence of a foreign substance in the monitored area from the reflection characteristic; and in place of the first means, A second means for driving an ultrasonic transducer to transmit a sound wave of a predetermined frequency to the monitored area to eliminate small animals that have entered the monitored area, the second means being provided. 2. The intrusion detection device according to claim 1, wherein said first and second means operate alternately at a predetermined cycle. 3. The intrusion detecting device according to claim 1, wherein said first and second means drive said ultrasonic transducer at different frequencies. 4. The apparatus according to claim 1, wherein said second means includes means for changing a driving frequency and / or a driving time of said ultrasonic transducer to change a transmission form of said predetermined frequency sound wave. 2. The intrusion detection device according to 1.