JPH07152978A - Intrusion alarm device - Google Patents

Abstract

PURPOSE:To detect an intruder outdoors over a wide ranges in a horizontal plane and a vertical plane by keepting the intensity of a circumferential received electric field around a sensor antenna at a constant optional value and obtaining an intrusion display in terms of attenuation values of the circumferential received electric field intensity. CONSTITUTION:When an intruder approaches the door of an entrance and the external surface of a fence and enters a range of optional circumferential received electric field intensity around the sensor antenna 1 given an optional circumferential electric field intensity, the circumferential received electric field intensity around the sensor antenna 1 attenuates owing to the dielectric loss of the intruder. Consequently, a high frequency voltage is amplified by a high frequency input amplifier 5 and the operating voltage of a detector 6 as a following stage is not reached, so an input DC voltage for the operation of a phototransistor 8 is not obtained and a relay operating amplifier 9 momentarily turns off, so that no current flows to a relay 10. Therefore, the operation is stopped and the contact of the relay 10 is connected to another contact to supply a current from a power source part to the circuit of an intrusion alarm 11, which operates to display intrusion.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an intrusion alarm device.

[0002]

2. Description of the Related Art Conventionally, many intrusion alarm devices have application means such as window and door switches, ultrasonic waves, infrared rays and microwaves.

[0003]

An intrusion alarm device using a window or a door switch is suitable as an alarm display when an alarm of intrusion is displayed at the time of opening and closing, and it is late in time and has already been intruded into a building or a room. Not a means. In the intrusion alarm device that applies ultrasonic waves, the reception range characteristics of the ultrasonic receiving element are narrow, so if the positions where the transmitting element and the receiving element are installed are not relative to each other, it is not possible to display an alarm that intrudes by blocking the transmission wave. At the same time, there is a great possibility that an intruder can easily avoid the ultrasonic waves up, down, left and right. The intrusion alarm device using infrared rays has a drawback that it has the same characteristics as the above-mentioned ultrasonic alarm device. Next, in an intrusion alarm device that applies microwaves, an electric field of microwaves can be generated in the vicinity of the microwave transmission source, but the reception range characteristic of the microwave receiving element is narrow, so this intrusion alarm means is also the same as the above-mentioned means. There are drawbacks. Therefore, in order to obtain a wide-range intrusion alarm, many receiving elements are required, and there is a drawback in that the receiving elements interfere with each other due to the circuit connection.

[0004]

A sensor antenna of arbitrary shape and a transmitting antenna are provided opposite each other at a predetermined concealed portion of a building, and the surrounding electric field strength of the sensor antenna is maintained at a constant arbitrary value. As a means to obtain an intrusion indication by the attenuation value of the surrounding received electric field strength, the DC voltage obtained by connecting the detector to the high frequency input amplifier of the receiving unit is applied to the input of the phototransistor via the variable resistor. By applying a DC output voltage made of a phototransistor to the relay, the relay is activated, and a means that the relay is deactivated by the attenuation value of the received electric field strength around the sensor antenna is displayed as an intrusion indicator. is there.

[0005]

As a result, when an intruder enters the area around the sensor antenna around the received electric field strength, the received electric field strength around the sensor antenna abruptly attenuates, and the relay of the DC circuit in the receiving section becomes inoperative and enters. A means for displaying that a person is present is obtained. In addition, by using this sensor antenna, the circumference 3 of the horizontal and vertical planes of the sensor antenna
It is possible to display the presence of an intruder outdoors over a wide range of 60 degrees, and it is possible to obtain the received electric field strength around the sensor antenna through the wall member of the building so that it can be shielded like a wall member. Through the section, intrusion warning means from the other side can be obtained.

[0006]

Embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows an antenna 2 that transmits radio waves at an arbitrary frequency.
3 is a block diagram of the transmitting unit 3 transmitting from the sensor antenna 1, the sensor antenna 1, and the receiving unit 4 as a means for displaying an intrusion alarm. FIG. 2 shows a monopole sensor antenna 1
The surrounding received electric field strength of is shown by a three-dimensional curve. FIG. 3 shows FIG.
The surrounding electric field strength of the sensor antenna 1 shown in FIG.
FIG. 4 shows the attenuation value of the received electric field strength around the sensor antenna 1 when there is an intruder. FIG. 5 shows the connection between the relay 10 and the intrusion alarm unit 11. In FIG. 6, the transmitter 3 and the transmitter antenna 2 are provided inside the wall material 23 on both sides of the door 22 at the entrance 21 of the building 20, and the sensor antenna 1 and the receiver 4 are provided inside the wall 24. Another embodiment will be described.
FIG. 7 is an embodiment diagram showing a state in which the transmitting unit 3, the transmitting antenna 2, the sensor antenna 1, and the receiving unit 4 are provided inside the fence 25 and an intruder 27 is present near the outer surface 26 of the fence 25.

Before operating the intrusion alarm device, the switch 17 shown in FIG. 5 is turned off. Transmitter 3 shown in FIG.
As shown in FIGS. 5 and 6, the sense antenna 1 at a given distance from the transmission antenna 2 connected to the sense antenna 1 is provided with the given ambient electric field strength shown in FIGS. 2 and 3. When there is an intruder 27, the received high frequency voltage generated by the received electric field strength around the sensor antenna 1 is amplified by the high frequency input amplifier 5 of the receiving unit 4 to a voltage value at which the detector 6 can detect and the amplified high frequency voltage is The detector 6 converts the direct current into a direct current through the variable resistor 7 and supplies it to the input part of the phototransistor 8 to activate the photodiode inside the phototransistor 8 to emit light to the inside of the phototransistor 8. The direct current voltage generated by the light received by a certain transistor is applied to the input part of the relay operation amplifier 9 at the next stage, and the relay operation amplifier 9 operates to cause a current to flow in the relay 10 shown in FIG. It is connected to the contact 14 and to hold the operating power of the intrusion alarm 11 in the state of OFF. Next, the switch 17 is turned on and held.

As shown in FIG. 6 and FIG.
When approaching the door 22 of the entrance 21 and the outer surface 26 of the fence,
When the sensor antenna 1 enters an arbitrary surrounding reception electric field strength,
Since the surrounding electric field strength of the sensor antenna 1 as shown in FIG. 3 is attenuated as shown in FIG. 4 due to the dielectric loss of the invader 27, the high frequency input amplifier 5 amplifies the high frequency voltage to detect the next stage. Since the operating voltage of the device 8 is not reached,
Since the input DC voltage for operating the transistor 8 is not obtained, the relay operation amplifier 9 is instantly deactivated, so that no current flows through the relay 10 shown in FIG. The contact 12 is connected to the contact 13, and a current flows from the power supply unit 16 to the power supply circuit 15 of the intrusion alarm device 11 to activate the intrusion alarm device 11 and display an intrusion.

The variable resistor 7 is for adjusting the input DC voltage that operates the phototransistor 8 according to the detection distance of the intruder 27. Also, unlike intrusion warning means that use infrared rays, ultrasonic waves, light rays, etc., it has the advantage that it does not malfunction or stop due to obstacles such as metal rods, metal pieces, wood pieces, paper, etc. Small animals have less dielectric loss, so they do not malfunction.

[0010]

As described above, according to the present invention, unlike the conventional alarm device, it is possible to detect an intruder outdoors in a wide range in a vertical plane.

[Brief description of drawings]

Figure 1: Block diagram of intrusion alarm device

FIG. 2 is a solid curve diagram of the surrounding electric field strength of the sensor antenna.

FIG. 3 Received electric field strength around the sensor antenna

[Fig. 4] Electric field strength around the sensor antenna when there is an intruder

[Fig.5] Connection diagram of relay and intrusion alarm device

FIG. 6 is a diagram showing an embodiment of the present invention.

FIG. 7 is a diagram showing an embodiment of the present invention.

[Explanation of sign]

 1 ... Sensor antenna 2 ... Transmission antenna 3 ... Transmission unit 4 ... Reception unit 5 ... High frequency input amplifier 6 ... Detector 7・ ・ ・ ・ ・ Variable resistor 8 ・ ・ ・ ・ ・ Photo transistor 9 ・ ・ ・ ・ ・ Relay operation amplifier 10 ・ ・ ・ Relay 11 ・ ・ ・ Intrusion alarm device 12 ・ ・ ・ ・ ・ Contact 13・ ・ ・ ・ ・ Contacts 14 ・ ・ ・ ・ ・ Contacts 15 ・ ・ ・ Power supply circuit 16 ・ ・ ・ Power supply unit 17 ・ ・ ・ Switch 20 ・ ・ ・ Building 20 ・ ・ ・・ Entrance 22 ・ ・ ・ ・ ・ Doors 23, 24 ・ ・ Wall material 25 ・ ・ ・ Wall 26 ・ ・ ・ ・ ・ Exterior wall 27 ・ ・ ・ Intruder

Claims (2)

[Claims] 1. A sensor antenna (1) having an arbitrary shape and a transmitting antenna (2) are provided at a predetermined concealing position of a building so as to face each other, and a surrounding electric field strength around the sensor antenna (1) is a constant arbitrary value. The intrusion alarm device is characterized in that the intrusion indicator is obtained according to the attenuation value of the surrounding received electric field strength. 2. A DC voltage obtained by connecting a detector (6) to a high frequency input amplifier (5) is applied to the input of a phototransistor (8) via a variable resistor (7), The DC output voltage generated by the transistor (8) is applied to the relay operation amplifier (9) to activate the relay (10), and the relay (10) is set at the attenuation value of the surrounding electric field strength of the sensor antenna (1). An intrusion alarm device having a receiving section (4) in which the means for deactivating is an intrusion display.