JPH0652450A - Heat ray type intrusion detector - Google Patents

Abstract

PURPOSE:To provide the heat ray type intrusion detector which is relaxed in installation restriction conditions for prevention against misalarming an excellent in operation convenience. CONSTITUTION:This intrusion detector is equipped with a 1st sensor system 10 which has a 1st detection area A1 and a 2nd sensor system 20 which has a 2nd detection area A2 so that the detection areas cross each other, and an AND processing part 30 which ANDs an intrusion signal from the 1st sensor system 10 and an intrusion signal from the 2nd sensor system 20. When a human body, etc., which radiates heat rays enters an area A12, the intrusion signals are outputted to the AND processing part 30 and an output circuit part 40 outputs an alarming signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is of a passive type,
The present invention relates to a hot-wire intrusion detector that can be limited to a closed space that releases a substantial detection area.

[0002]

2. Description of the Related Art FIG. 7 is an explanatory view showing a conventional heat ray type intrusion detector. As shown in FIG. 7, the conventional hot-wire intrusion detector 1 includes one sensor system 10 having a detection area A ₁ . The sensor system 10 includes a light receiving lens 11, a light receiving element 12, a determination circuit unit 13, and an output circuit unit 14.

The light receiving lens 11 collects heat rays coming from the direction of the detection area A ₁ . The light receiving element 12 is
It is arranged in the vicinity of the focal point of the light receiving lens 11, and is composed of a pyroelectric element or the like that outputs a voltage according to the rate of change when the amount of heat received changes. Judgment circuit section 13
Is a part that amplifies the output from the light receiving element 12 and determines whether or not the output from the light receiving element 12 is above a predetermined level, and outputs an intrusion signal when the output is above the predetermined level. The output circuit unit 14 conforms the intrusion signal from the determination circuit unit 13 to the reception specification (non-voltage contact input or voltage input) of the security receiver (not shown) connected to the hot-wire intrusion detector 1. It is a part for converting into a warning signal to be output and outputting it to the security receiver (not shown).

The hot-wire intrusion detector 1 constructed as described above operates as follows. In other words, such as a human body so as to radiate heat rays, or when you pass through the detection area A detection area A ₁ or entering the _1, heat ray amount received by the light receiving element 12 is abruptly changed. Then, the light receiving element 12 outputs a voltage according to the change rate to the determination circuit unit 13. The determination circuit unit 13 detects that the voltage from the light receiving element 12 is a predetermined level or higher,
When it is determined that the voltage is equal to or higher than the voltage generated by the normal slight fluctuation of the heat dose of the background radiation, the intrusion signal is output to the output circuit unit 14. Then, the output circuit unit 14 outputs a warning signal that conforms to the reception specifications of the security receiver (not shown). Then, the security receiver (not shown) sounds an alarm sound to notify the presence of an intruder.

[0005]

However, in the conventional heat ray type intrusion detector 1, all the heat rays coming from the direction of the detection area A _{1 in} front of the light receiving lens 11 are used as the data for intrusion detection. I will end up. For this reason, whether or not the headlight light of the automobile containing the heat ray is not incident in the direction of the detection area A ₁ far away from the heat ray type intrusion detector 1 when there is, for example, an automobile road, or After carefully considering whether or not there is a heating facility that causes a sudden temperature change and the area where the original intrusion detection is desired, the installation location and detection area of the heat ray type intrusion detector 1 are considered. If the direction of A ₁ is not determined, there is a problem that an erroneous alarm will be output that outputs an alarm signal even if there is no intruder who originally wants to be detected.

The present invention has been made in order to solve the above-mentioned problems, and the purpose thereof is to alleviate installation constraint conditions such as an installation location and a detection area direction for preventing false alarms. In addition, it is to provide a hot-wire intrusion detector that is easy to use and is less likely to cause false alarms.

[0007]

In order to solve the above problems, the present invention provides a first sensor system and a second detection area having a first detection area arranged so that the mutual detection areas intersect with each other. AND which takes the logical product of the 2nd sensor system which has, the intrusion signal from the 1st sensor system, and the intrusion signal from the 2nd sensor system
At least a processing unit is provided, and the output is issued by the AND processing unit.

[0008]

With the above construction, the alarm is issued only when the intruder enters the area where the first detection area and the second detection area intersect.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic construction of the heat ray type intrusion detector according to the present invention will be described with reference to FIG. 1, and the first embodiment will be described with reference to FIGS.
Embodiments will be described in detail with reference to FIGS. 5 and 6. FIG. 1 is an explanatory diagram showing a basic configuration of a heat ray type intrusion detector,
2 is a perspective view showing the hot-wire intrusion detector and its detection area, FIG. 3 is a side view showing the installation state and the detection area of the hot-wire intrusion detector, and FIG. 4 is a main part showing the hot-wire intrusion detector. FIG. 5 is a block circuit diagram, FIG. 5 is a perspective view showing the hot-wire intrusion detector and its detection area, and FIG. 6 is a side view showing the installation state and the detection area of the hot-wire intrusion detector. 1 to 6, the same reference numerals are given to the same parts.

First, the basic construction and operation of the heat ray type intrusion detector will be described with reference to FIG. As shown in FIG. 1, the hot-wire intrusion detector 1 includes a first sensor system 10 having a first detection area A ₁ , a second sensor system 20 having a second detection area A ₂ , and an AND processing unit 30. , And an output circuit section 40.

The first sensor system 10 is configured to include a light receiving lens 11, a light receiving element 12 and a determination circuit section 13, and the second sensor system 20 also includes a light receiving lens 21, a light receiving element 22 and a determination circuit section 23. Composed. In addition, the light receiving lens 11,
Reference numeral 21 is a mechanism capable of varying the optical axis direction thereof.
2 are also set to move. That is, by changing the optical axis direction of the light receiving lenses 11 and 21,
Area A ₁₂ where detection area A ₁ and second detection area A ₂ intersect
Can be positioned near or far from the heat ray type intrusion detector 1.

The light receiving lens 11 collects heat rays coming from the direction of the detection area A ₁ , and the light receiving lens 21 collects heat rays coming from the direction of the second detection area A ₂ . The light-receiving element 12 is disposed near the focus of the light-receiving lens 11, and the light-receiving element 22 is disposed near the focus of the light-receiving lens 21. When the heat dose received changes, a pyroelectric element that outputs a voltage according to the rate of change is received. It is composed of. The determination circuit unit 13 is a portion that amplifies the output from the light receiving element 12 and determines whether the output from the light receiving element 12 is at or above a predetermined level and outputs an intrusion signal when the output is at or above the predetermined level. The circuit portion 23 is a portion that amplifies the output from the light receiving element 22 and determines whether the output from the light receiving element 22 is equal to or higher than a predetermined level, and outputs an intrusion signal when the output is equal to or higher than the predetermined level.

The AND processing section 30 is a section that obtains the logical product of the intrusion signal from the first sensor system 10 and the intrusion signal from the second sensor system 20. The output circuit section 40 adapts the output from the AND processing section 30 to the reception specification (non-voltage contact input or voltage input) of the crime prevention receiver (not shown) connected to the hot-wire intrusion detector 1. This is a part for converting into a warning signal and outputting it to a security receiver (not shown).

The hot-wire intrusion detector 1 constructed as described above operates as follows. That is, a human body or the like that radiates heat rays may be detected by the first detection area A ₁ and the second detection area A ₂
When moving around outside the area A _{12 that} intersects with _, the heat dose received by each of the light receiving elements 12 _and 22 does not change, or only one of them changes abruptly. That is, when a human body that radiates heat rays is moving around outside the area A ₁₂ , the intrusion signal of the determination circuit unit 13 of the first sensor system 10 and the intrusion signal of the determination circuit unit 23 of the second sensor system 20 At least one of the two is in a non-output state, and the AND processing unit 3
Since 0 is not output, the output circuit unit 40 also does not output a warning signal. Therefore, the human body that radiates heat rays is in the area A.
_{12 When} moving around outside, the hot-wire intrusion detector 1 does not output a warning signal.

[0015] However, the human body so as to radiate heat rays or passed through an area A ₁₂ or enters the area A _12,
The heat doses received by the light receiving elements 12 and 22 both rapidly change. Then, the light receiving elements 12 and 22 output the voltages corresponding to the rate of change to the determination circuit units 13 and 23, respectively. When the determination circuit units 13 and 23 determine that the voltages from the light receiving elements 12 and 22 are equal to or higher than the predetermined levels and are equal to or higher than the voltage generated by the fluctuation of the heat dose of the usual slight background radiation, the intrusion signal is output. It outputs to the AND processing unit 30, respectively. Then, the AND processing unit 30 outputs to the output circuit unit 40. Then, the output circuit section 40 outputs a warning signal.

That is, in the heat ray type intrusion detector 1, a human body or the like that radiates heat rays enters the area A ₁₂ or the area A ₁₂ .
_The warning signal is output only when ₁₂ is passed.
That is, the substantial detection area of the heat ray type intrusion detector 1 is
It is limited to the area A ₁₂ .

Next, a hot wire type intrusion detector as a first embodiment will be described with reference to FIGS. The hot-wire intrusion detector 1 shown in FIG. 2 includes the above-described first sensor system and second sensor system inside. The first sensor system has a first detection area A ₁ extending in a conical shape with the light receiving lens 11 as the apex, and the second sensor system also has a second detection area A ₂ extending in a conical shape with the light receiving lens 21 as the apex. have. Moreover, the first
Area A ₁₂ where detection area A ₁ and second detection area A ₂ intersect
Are formed. Therefore, the substantial detection area of the hot-wire intrusion detector 1 shown in FIG. 2 is limited to the area A ₁₂ as is clear from the above description.

That is, like the intruder M shown in FIG. 2, if the intruder M only passes through _{one of} the first detection area A ₁ and the second detection area A ₂ , the heat ray type intrusion detector 1 Does not output a warning signal, and the intruder M does not output a warning signal until the intruder M passes through the area A ₁₂ .

FIG. 3 is a side view showing the range of the area A ₁₂ when the heat ray type intrusion detector 1 shown in FIG. 2 is installed on the wall surface in the room. Air-conditioning equipment (not shown) in which area A ₁₂ is formed and causes abrupt temperature changes on the ceiling, floor, and opposing walls.
Even if an incandescent lamp (not shown) or the like is installed, it is possible to prevent false alarms from occurring. That is, the installation constraint condition is relaxed as compared with the conventional hot-wire intrusion detector.

The hot-wire intrusion detector 1 has a circuit structure as shown in FIG. 4 inside. The circuit configuration shown in FIG. 4 is substantially the same as the circuit configuration described with reference to FIG.
Since the same parts are denoted by the same reference numerals, the description will focus on the parts that do not appear in FIG. In FIG. 4, FIG.
The part that is shown in detail in comparison with the determination circuit unit 13,
23 and the display circuit section 50.

As shown in FIG. 4, the determination circuit unit 13 is configured to include an amplifier circuit 13a, a determination circuit 13b, a reference voltage circuit 13c, and a sensitivity adjustment resistor 13r, and the determination circuit unit 23.
Is an amplifier circuit 23a, a determination circuit 23b, and a reference voltage circuit 23.
c and a sensitivity adjusting resistor 23r. The amplifier circuit 13a is a part that amplifies the output of the light receiving element 12 and outputs the amplified output to the determination circuit 23b. Reference voltage circuit 13c
Is a portion that generates a voltage that serves as a reference for the determination circuit 13b to determine the level of the output from the amplifier circuit 13a. The sensitivity adjustment resistor 13r is for finely adjusting the reference voltage from the reference voltage circuit 13c. When the determination circuit 13b determines the level of the output from the amplifier circuit 13a by adjusting the sensitivity adjustment resistor 13r. It is made so that the standard of can be changed.

The amplifier circuit 2 inside the determination circuit section 23
3a, the determination circuit 23b, the reference voltage circuit 23c, and the sensitivity adjustment resistor 23r conform to the inside of the determination circuit unit 13 described above, and thus description thereof will be omitted, but the sensitivity adjustment resistors 13r and 23r.
Is preferably adjusted so as to cover a part of the area A ₁₂ that is slightly farther than the farthest part, and if the sensitivity is raised too much, fluctuations in the heat dose due to normal background radiation will also be detected. Yes, it causes a false alarm.

The display circuit section 50 switches the lighting state of a light emitting diode (not shown) provided in the heat ray type intrusion detector 1, and the light emitting diode is normally green when power is supplied. When the heat wire type intrusion detector 1 detects an intruder and the output circuit section 40 outputs a warning signal, the light emitting diode is turned on in red.

Next, a hot wire type intrusion detector as a second embodiment will be described with reference to FIGS. 5 and 6. As shown in FIG. 5, the hot-wire intrusion detector 1 of the second embodiment differs from that of the first embodiment in the following configuration. That is, by changing the shape of the light receiving lenses 11 and 21 or the light receiving surface shape of the light receiving elements 12 and 22, the first sensor system extends in a rectangular pyramid shape having a narrow horizontal width and a wide vertical width with the light receiving lens 11 as an apex. That is, the first detection area A ₁ is provided, and the second sensor system is also provided with the second detection area A ₂ extending in a rectangular pyramid shape having the light receiving lens 21 at the apex and having a narrow horizontal width and a wide vertical width.

An area A ₁₂ where the first detection area A ₁ and the second detection area A ₂ of the heat ray type intrusion detector 1 intersect is as follows.
As shown in FIG. 5 or FIG. 6, it has a curtain shape (plate shape) having a narrow horizontal width and a wide vertical width. Therefore, in the hot-wire intrusion detector 1 as shown in FIG. 5, a heating / cooling device (not shown) or an incandescent lamp (not shown) that causes a sudden temperature change is installed on the ceiling or floor. Although it is not installed, if an air conditioner (not shown) or incandescent lamp (not shown) that causes a sudden temperature change on the opposite wall is installed, avoid the opposite wall and report an error. It is possible to provide a substantial detection area while preventing the occurrence of.

The present invention is not limited to the above embodiment, and more sensor systems may be provided to reduce false alarms. Further, the detection area of each sensor system may have a more complicated shape instead of a circular shape or a rectangular shape, so that the substantial detection area may have a more complicated shape. Further, the heat ray type intrusion detector is not one to be used by connecting it to the crime prevention receiver, but is one in which the heat ray type intrusion detector itself sounds an alarm to notify the presence of an intruder. It may be.

[0027]

Since the hot-wire intrusion detector of the present invention is constructed as described above, the substantial detection area is first
Since it can be limited to the area where the detection area and the second detection area intersect, the substantial detection area can be set as a spot (closed space) range apart from the heat ray type intrusion detector, resulting in a false alarm. The present invention has an effect that it is possible to provide an excellent hot-wire intrusion detector which is easier to use than conventional ones because installation restrictions such as an installation place and a direction of a detection area for preventing the occurrence of the alarm are eased and a false alarm does not easily occur.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a basic configuration of a heat ray type intrusion detector according to the present invention.

FIG. 2 is a perspective view showing a hot-wire intrusion detector according to an embodiment of the present invention and its detection area.

FIG. 3 is a side view showing an installation state and a detection area of the hot-wire intrusion detector of one embodiment according to the present invention.

FIG. 4 is a principal block circuit diagram showing a hot-wire intrusion detector according to an embodiment of the present invention.

FIG. 5 is a perspective view showing a hot-wire intrusion detector according to another embodiment of the present invention and its detection area.

FIG. 6 is a side view showing an installation state and a detection area of a heat ray type intrusion detector of another embodiment according to the present invention.

FIG. 7 is an explanatory diagram showing a conventional hot-wire intrusion detector.

[Explanation of symbols]

1 Heat Wire Intrusion Detector 10 First Sensor System 20 Second Sensor System 30 AND Processing Unit A ₁ First Detection Area A ₂ Second Detection Area

Claims (1)

[Claims] 1. A first sensor system having a first detection area and a second sensor system having a second detection area, which are arranged so that their mutual detection areas intersect, and an intrusion signal from the first sensor system. AND that takes the logical product of the intrusion signal from the second sensor system
A hot-wire intrusion detector, comprising at least a processing unit, and issuing an alarm by using an output of the AND processing unit.