JP3458738B2 - Human body detection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared ray receiving type human body for detecting the presence or absence of a human body within a detection area based on the difference between the amount of infrared rays emitted from the human body and the amount of infrared rays emitted from the background such as the floor. The present invention relates to a detection device.

[0002]

2. Description of the Related Art An infrared ray receiving type (so-called PIR type) human body detecting device detects a temperature difference between a human body and a background as an infrared energy difference using an infrared detecting element such as a pyroelectric element. , To detect the human body. This type of human body detection device mainly detects a human body moving on foot or the like. Utilizing this detection output, lighting / lighting control of an illumination lamp or drive / stop control of a buzzer, siren, etc. is performed. I am doing.

The infrared type human body detecting device described above has a detection area developed and constantly monitors the amount of infrared rays changing in the detection area. Then, when a human body enters the detection area, the amount of infrared rays emitted from the human body and incident on the infrared detection element through an optical system such as a condenser lens is larger than the amount of infrared rays emitted from the background in the detection area. Since it increases (or decreases), the human body is detected from this change.

By the way, in this type of human body detecting device, the light receiving direction of the optical system is made substantially horizontal to widen the detection area, and by setting it obliquely downward or downward, the human body detecting device can be positioned below the human body detecting device. The human body passing through is detected.

[0005]

However, in the conventional human body detection device, a noise output called popcorn noise that occurs sporadically in an extremely short time is an output generated when the human body exists in the detection area. It may be determined that the output is generated due to the presence of a human body in the detection area even if a flying object or an insect has just entered the detection area. In particular, when the human body detection device described above is used for crime prevention, there is no intruder because a buzzer sounds when a human body is detected and the security company is automatically notified that there is an intruder. Nonetheless, if the above measures are taken, it will bother the neighborhood and invite unnecessary guards to be dispatched.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a human body detection apparatus with improved human body detection accuracy.

[0007]

The invention according to claim 1 is
A human body detection device comprising a pyroelectric element section for detecting infrared rays emitted from a human body and an optical system for condensing infrared rays in a detection area, which is a substantially concentric circular surface area with different detection distances, to the pyroelectric element section. , When a human body is detected in another detection area within a predetermined time after the human body is detected in a certain detection area, the process moves to the advance notice stage, and then the human body is detected in any one of the detection areas within a predetermined time. If, which has an output circuit for outputting a detection signal as the human body it enters, entering from the outside of a house
Detection areas are placed in front of and behind the direction of approaching your mouth.
The output circuit issues a warning signal at the warning stage.
Forces the intruder to leave the detection area
The feature is that the advance notice is given as a recommendation .

According to a second aspect of the present invention, the pyroelectric element portion for detecting infrared rays emitted from the human body and the infrared rays in the detection area, which is a substantially concentric circular surface area having different detection distances, are condensed on the pyroelectric element portion. A human body detection device consisting of an optical system that moves to the advance notice stage when a human body is detected in another detection area within a predetermined time after the human body is detected in one detection area, and within a predetermined time from there. When the human body is detected in the two detection areas where the human body is detected first, it is equipped with an output circuit that outputs a detection signal as if the human body has entered , and it is provided from the outside of the house to the entrance.
Detection areas are arranged in front of and behind the direction of approaching,
The output circuit outputs a warning signal at the warning stage.
By doing so, we advise intruders to leave the detection area.
It is characterized in that the advance notice is given.

[0009]

[0010]

According to a third aspect of the present invention, in the human body detection device according to the first or second aspect , in the output circuit, when the human body is detected in the detection area according to a predetermined order, a notice step is given. It is characterized in that it does not shift and does not output a detection signal.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to FIGS. 1A and 1B are explanatory views showing a detection area developed by the human body detection apparatus according to the present invention, where FIG. 1A is a top view and FIG. 1B is a side view. FIG. 2 is an explanatory view showing a mounting state of the pyroelectric element portion of the human body detection device according to the present invention. FIG. 3 is a schematic configuration diagram of a human body detection device according to the present invention. FIG. 4 is a time chart showing the operation of the human body detection device according to the present invention. FIG. 5 is a time chart showing another operation of the human body detection device according to the present invention. FIG. 6 is an explanatory diagram showing how the human body detection device according to the present invention determines the approach direction of a human body.
(A) is a top view and (b) is a side view.

As shown in FIG. 1, the infrared type human body detecting device S according to the present embodiment is attached to, for example, an entrance upper wall surface W of a house. Then, in order to configure two independent detection areas B1 and B2, as shown in FIG.
The pyroelectric element portions 21 and 22, the amplification circuit portions 31 and 32 for amplifying the output signals of the pyroelectric element portions 21 and 22, and the optical system 11 and 12 such as a lens for condensing infrared rays are provided as two sets.
The human body is detected by processing the infrared rays emitted in the detection areas B1 and B2, respectively. In addition,
The number of the detection areas B is not limited to this, and as long as a plurality of independent detection areas B can be configured, the optical system 1 and the pyroelectric element unit 2 that configure the human body detection device S.
The number of amplifier circuits 3 is not limited to this.

Optical systems 11 and 12 and pyroelectric element parts 21 and 22
Two detection areas B1 determined by the mounting positions of
As shown in FIG. 1, B2 is deployed in a diagonally downward direction so that the human body is disposed in front of and behind the direction of entering the house. The detection areas B1 and B2 do not overlap each other, and a dead zone having a predetermined distance is provided between the detection areas B1 and B2.

In this embodiment, the human body detecting device S is installed on the wall surface W having a height of about 200 cm from the floor surface, and as shown in FIG. The optical system 11 and the electric element portion 21 are 40
The other optical system 12 and the pyroelectric element portion 22 which are arranged obliquely downward by about deg. And constitute the detection area B2 are arranged obliquely downward by about 75 ° from the horizontal direction.
As a result, both of the detection areas B1 and B2 can be set diagonally downward.

With the above-described structure, for example, when the detection area is developed in the horizontal direction, the human body stays in the same detection area for a long time while the human body approaches the human body detection device S from a distance. The pyroelectric element unit 2 may not be able to detect the temperature difference from the background and the movement of the human body may not be detected, but in the present embodiment, the human body is in the process of approaching the human body detection device S from a distance. Since the human body does not cross the detection area diagonally and stays in the detection area for a long time, it is possible to reliably detect the movement of the human body.

As shown in FIG. 3, the human body detecting device S according to the present embodiment has two optical systems 11 for collecting infrared rays emitted from the human body so as to generate two detecting areas B1 and B2. 12, two pyroelectric element portions 21 and 22 for detecting the collected infrared rays, two amplifying circuit portions 31 and 32 for amplifying outputs of the pyroelectric element portions 21 and 22, and unnecessary frequency components are removed. And two band filters 41 and 42 for extracting only necessary signals, and comparator circuits 51 and 52 for generating a pulse signal when the outputs from the band filters 41 and 42 exceed a preset threshold value, and a comparator circuit. A timer 61 which operates for a predetermined time when 51, 52 generate a pulse,
62, and counters 71 and 72 for measuring the number of pulses generated until a predetermined time elapses after the pulses are generated.
And signal output circuits 81 and 82 which output signals when the counters 71 and 72 measure pulses a predetermined number of times or more within a predetermined time when the timers 61 and 62 operate. In addition, which of the timer 100 that measures the time when the signal outputs of the two signal output circuits 81 and 82 occur within a predetermined time difference, or the comparison circuit 51 and 52 before the timer 100 measures the predetermined time The detection determination output circuit 110 that determines that a human body is present when a signal is output
And an output circuit 120 that outputs a detection signal when it is determined that a human body is present.

Next, the operation of the human body detecting device S used for detecting an intruder will be described with reference to FIG. When the human body enters the detection area B1, the detection area B
The comparator circuit 51 that develops 1 generates a pulse (see FIG. 4).
(See (a)). Then, the timer 61 starts measurement for a predetermined time (here, the predetermined time is 3 seconds) (see FIG. 4B), but the comparison circuit 51 outputs the pulse a predetermined number of times (see FIG. 4B). Since the predetermined number of times is set to 2 here (see FIG. 4A), the signal is output from the signal output circuit 81 when the second pulse is generated (see FIG. 4C).

Here, if the signal output circuit 82 does not output a signal within a predetermined time lag after the signal output circuit 81 outputs a signal, it is not judged that an intruder has entered, and the output circuit 120 controls the signal. No signal is output. This is because intruders generally walk in the detection areas B1 and B2 almost straight from the outside toward the entrance of the house, while other people and small animals such as dogs and cats wander. This is because it is considered to approach the entrance. Also,
Even when the signal output circuit 81 outputs a signal almost at the same time that the signal output circuit 81 outputs a signal, it is not determined that an intruder has entered, and the output circuit 120 does not output a control signal. This is to prevent the influence of sunlight or light irradiation that causes temperature changes in the detection areas B1 and B2 almost simultaneously. Therefore, FIG.
As shown in (f), if the signal output circuit 82 outputs a signal within the set time difference (here, the predetermined time difference is set between 0.5 seconds and 4 seconds) (see FIG. See (f)), and it is determined that an intruder exists, and the process moves to the advance notice stage. Although it may be possible to output a detection signal that the human body has entered here, it is possible to further reduce the effects of popcorn noise, flying objects, insects, etc. by detecting the movement of the human body after moving to the advance notice stage. However, in order to detect the human body with high accuracy and improve reliability, the detection signal may not be output.

After that, the time measurement is started by the timer 100, and a preset time (the set time here is 10
If a human body is detected in any of the detection areas B1 and B2 by the time (see FIG. 4 (g)),
The presence of an intruder is determined by the detection determination output circuit 110 (see FIG. 4 (i)), and the detection signal is output from the output circuit 120 (see FIGS. 4 (k) and (l)). At that time, in response to the detection signal output from the output circuit 120, the detection areas B1 and B2 may be illuminated by an illumination lamp or the like, or a ringing device such as a buzzer may be driven. In the present embodiment, light emission and ringing are performed for a predetermined notification time (15 seconds).

It should be noted that by adding an element for detecting light such as a Cds light receiving element or a photodiode, day / night determination is performed, and if the environment in which the human body detection device S is installed is bright, the illumination lamp is not turned on. (See FIG. 4 (j)). This makes it possible to prevent unnecessary power consumption in a bright environment, even if the lighting or the like is turned on by the control signal, because the notification effect is not exhibited.

At the advance notice stage, a small buzzer sound is emitted, or the detection area B1,
It is also possible to give advance notice such as giving a recommendation to move out of B2 (see FIG. 4 (h)). As a result, it becomes possible to prompt the intruder to give a warning before the stage of full-scale notification such as sounding a large buzzer sound or notifying a security company. Especially, the buzzer sound that sounds at the stage of full-scale notification is set to a large volume for the purpose of notifying neighboring people, but it is not possible to sound a large buzzer sound even if there are no intruders. Since this may cause troubles such as neighborhood troubles, it is useful to give a warning to an intruder or a person who accidentally enters the detection areas B1 and B2 at the notice stage and to leave the detection areas B1 and B2.

In the human body detecting apparatus S described above, if the operation time of the timers 61 and 62 and the number of pulses output by the signal output circuits 81 and 82 are changed in accordance with the operation of the timer 100, the human body is detected. Since it is possible to freely set the time until detection, it is possible to perform detection according to the installation location of the human body detection device S by making these settings.

Further, in the present embodiment, if a human body is detected in any of the detection areas B1 and B2 after the timer 100 starts measuring time, a detection judgment output indicating that an intruder exists is output. Although the circuit 110 makes the judgment (see FIGS. 4 (g) and 4 (i)), FIG. 5 (c) and FIG.
As shown in (f) and FIG. 5 (i), from when the timer 100 starts measuring time until a predetermined time elapses,
Within the predetermined time in the two detection areas B1 and B2 that previously detected the human body (here, the predetermined time is from 0.1 second to 0.9
It may be assumed that an intruder is present in the detection determination output circuit 110 when a human body is detected in (seconds).
As a result, the human body can be detected with high accuracy without being affected by popcorn noise, flying objects, insects, etc., and reliability can be improved.

Further, the entering direction of the intruder may be determined from the positional relationship between the detection areas B1 and B2. That is, as shown in FIG. 6, the transition to the advance notice stage is limited to the case where the signal from the detection area B1 occurs before the signal from the detection area B2. As described above, the advance to the advance notice stage and the output of the detection signal are performed, and when the human body moves as shown by arrow B, the advance to the advance notice stage is not performed and the detection signal is not output. Thereby, for example, when the detection areas B1 and B2 are provided around the house,
It is possible to avoid an inconvenient situation in which a resident living outside the house is judged to be an intruder and a detection signal is output.

[0026]

As described above, according to the first aspect of the invention, the pyroelectric element portion for detecting infrared rays emitted by the human body and the detection area which is a substantially concentric circular surface area having different detection distances. A human body detection device including an optical system that focuses infrared rays on a pyroelectric element part, and when a human body is detected in another detection area within a predetermined time after the human body is detected in one detection area When the human body is detected in any one of the detection areas within a predetermined time after the transition, an output circuit that outputs a detection signal as if the human body has entered is provided so that the human body diagonally moves the detection area. Since it is crossed, it is possible to improve the detection sensitivity compared to the case where the detection area is developed in the horizontal direction, and the output in the two detection areas is increased. By detecting the human body based on each of the signals, it is possible to reduce the influence of noise such as popcorn noise and the influence of external factors such as flying objects. It is possible to provide a detection device.

According to the second aspect of the present invention, the pyroelectric element portion for detecting infrared rays emitted by the human body and the infrared rays in the detection area, which is a substantially concentric circular surface area having different detection distances, respectively. A human body detection device including an optical system for condensing light onto a human body, wherein the human body is detected in another detection area within a predetermined time after the human body is detected in a certain detection area. When the human body is detected in the two detection areas where the human body was previously detected within the time, an output circuit that outputs a detection signal as if the human body has entered is provided, so the human body crosses the detection area diagonally. Therefore, it becomes possible to improve the detection sensitivity as compared with the case where the detection areas are developed in the horizontal direction, and the outputs are output in the two detection areas. By detecting the human body based on each signal, it is possible to minimize the influence of noise such as popcorn noise and the influence of external factors such as flying objects, improving the accuracy of human body detection It is possible to provide the human body detection device described above.

Moreover, in the inventions according to claims 1 and 2 , a person who approaches from the outside of the house toward the entrance.
The detection areas are placed in front of and behind the
Intrusion by outputting a warning signal at the warning stage
A warning is given to the person as a recommendation to move out of the detection area.
I made a big buzzer sound
Reach the stage of full-scale notification, such as reporting to a security company
It will be possible to warn intruders by
Warns intruders and those who accidentally enter the detection area
There is an effect that it is useful because it can be given and removed from the detection area .

[0029]

According to the invention of claim 3 , claim 1
Alternatively, in the human body detection device according to claim 2 , in the output circuit, when the human body is detected in the detection area in accordance with a predetermined order, the detection circuit does not move to the advance notice stage and does not output the detection signal. Since it is possible to output the detection signal only in the case of a specific approach route, there is an effect that it is possible to detect only an intruder with high accuracy by assuming the detection of an intruder in advance.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a detection area developed by a human body detection device according to the present invention, (a) is a top view, and (b) is a side view.

FIG. 2 is an explanatory view showing a mounting state of a pyroelectric element portion of the human body detection device according to the present invention.

FIG. 3 is a schematic configuration diagram of a human body detection device according to the present invention.

FIG. 4 is a time chart showing the operation of the human body detection device according to the present invention.

FIG. 5 is a time chart showing another operation of the human body detection device according to the present invention.

6A and 6B are explanatory views showing how the human body detection device according to the present invention determines the approach direction of a human body, FIG. 6A is a top view, and FIG. 6B is a side view.

[Explanation of symbols]

B detection area S human body detection device 1 Optical system 2 Pyroelectric element 110, 120 output circuit

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-6-274768 (JP, A) JP-A-9-90053 (JP, A) JP-A-5-203763 (JP, A) JP-A-7- 139968 (JP, A) JP-A-1-317862 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G08B 13/00-15/02

Claims (3)

(57) [Claims] 1. A human body comprising a pyroelectric element portion for detecting infrared rays emitted from a human body and an optical system for condensing infrared rays in a detection area, which is a substantially concentric circular surface area having different detection distances, on the pyroelectric element portion. It is a detection device, and when a human body is detected in a certain detection area within a predetermined time after detection of a human body in another detection area, the process shifts to the advance notice stage, and any one detection area within a predetermined time thereafter. When a human body is detected in, the output circuit outputs a detection signal as if the human body entered ,
Check before and after the direction from the outside of the house toward the entrance.
There is a knowledge area, and the output circuit is at the notice stage.
Detection of intruders by outputting a warning signal
A notice will be given as a recommendation to move out of the area
A human body detection device characterized by what it has done. 2. A human body comprising a pyroelectric element portion for detecting infrared rays emitted from a human body and an optical system for condensing infrared rays in a detection area, which is a substantially concentric circular surface area having different detection distances, onto the pyroelectric element portion. It is a detection device, and when a human body is detected within a certain detection area within a predetermined time after detection of a human body in another detection area, the process moves to the advance notice stage, and within that time, the human body is detected earlier within a predetermined time. Two
If the human body is detected in One of the detection area, also with an output circuit for outputting a detection signal as the human body enters
The direction of entering from outside the house toward the entrance
There are detection areas before and after the
An intruder can be output by outputting a warning signal at the notification stage.
A notice will be issued to the detection area as a recommendation to move out of the detection area.
Human body detecting device being characterized in that none As. 3. The output circuit according to claim 1, wherein when a human body is detected in a detection area in accordance with a predetermined order, the detection circuit does not move to the advance notice stage and the detection signal is not output. Alternatively, the human body detection device according to claim 2 .