JPH0814626B2 - Human body detection device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a human body detection device that detects a human body by detecting the amount of infrared light in a specific area of a detection area.

(Prior Art) Conventionally, for example, as disclosed in “Transistor Technology Separate Volume Sensor Interfacing No.2, pages 187 to 194”, an infrared sensor installed in the detection area and infrared rays from the detection area are detected on the infrared sensor. It is equipped with a condensing system that uses a reflecting mirror or lens that condenses light on the body, and a signal processing circuit that determines the presence or absence of the human body based on the amount of infrared light detected by an infrared sensor. It is known to detect the presence of a human body in the area.

(Problems to be Solved by the Invention) By using the above conventional one, it is possible to automatically detect whether or not a human body is present in the detection area.
For example, it can be applied to a crime prevention device or the like. But,
On the other hand, it is not possible to detect in which area of the detection area the human body exists. Therefore, there is a problem that it cannot be used for an action for a specific area of the detection area, for example, for the purpose of performing cooling and heating by specifying a direction in an air conditioner.

Therefore, for example, as disclosed in Japanese Utility Model Laid-Open No. 60-129686, by rotating a scanning mirror, the field of view of an infrared sensor having a predetermined width is moved (scanned). There is a device that can detect the position of the human body in the detection area by changing the amount of infrared light to be detected.

However, in the case of such a configuration, when a person moves in the detection area, the number of people in the detection area cannot be accurately detected. In detail,
The detection area is divided into four areas A to D, and A, B, C, D
When the field of view of the infrared sensor is moved in the order of, for example, when the field of view of the infrared sensor is set to B,
Immediately after it is detected that there is a person in this area B, if this person moves to area C, then when the field of view of the infrared sensor is set to C, it is detected that there is also a person in this area C. Furthermore, if this person moves to the area D immediately after this detection, it is detected that there is also a person in this area D when the field of view of the infrared sensor is set to D. That is, in reality, although there is only one person in the detection area, it is recognized that there are three persons.

The present invention has been made in view of such a point, and an object thereof is to specify where in the detection area a human body exists, and to determine the number of persons even when a person moves in the detection area. To prevent misidentification of.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the solving means of the present invention is to gradually expand and change the region for detecting infrared rays from the human body from a partial region of the detection area to the entire region, The position of the human body in the detection area was specified so that the number of people in the detection area would not be misidentified even if a person moved.

Specifically, as shown in FIG. 1, an infrared amount detecting means (4) installed in a detection area (1) for detecting the presence of a human body and detecting the amount of infrared light, and a detection area (1). Infrared ray condensing means (l) for condensing the infrared ray from the partial area (A) in () on the infrared ray amount detecting means (4).
And a human body detecting means (11) for detecting the presence of a human body based on a change in the amount of infrared light detected by the infrared ray amount detecting means (4), and the infrared ray is condensed by the infrared ray condensing means (l). The partial area (A) is gradually changed from a partial area of the detection area (1) to the entire detection area (1) so that the human body detecting means (11) can detect the presence of the human body. Partial area enlarging means for enlarging and changing (20)
And a determination means (12) for receiving the outputs of the human body detection means (11) and the partial area expansion means (20) and determining the presence of a human body in the detection area (1).

(Operation) With the above configuration, in the present invention, the infrared light condensing means (l) allows the partial area (A) in the detection area (1).
Infrared rays from are collected on the infrared ray amount detecting means (4), and the amount of infrared rays in the partial area (A) is detected. Then, the human body detecting means (11) detects the presence of the human body in the partial area (A) based on the change in the amount of infrared light detected by the infrared detecting means (4). Then, the partial area enlarging means (20) gradually enlarges and changes the partial area (A) from a partial area of the detection area (1). In this case, the determination means (12) detects that a human body is present in the enlarged partial area (A) at this time.

In particular, even when a person is moving in the detection area (1), the number of people in the partial area (A) is recognized based on the total amount of infrared light detected by the infrared detection means (4). There will be no misunderstanding of the number of people in such a situation as it will be possible.

(Examples) Examples of the present invention will be described below with reference to FIGS.

FIG. 2 shows an installation state of the human body detection apparatus according to the present embodiment, and (1) is a rectangular parallelepiped indoor space as a detection area for detecting the presence of a human body, and 1 of the indoor space (1) A human body detection device (2) is attached to the upper part of one chamber wall (1a). In the human body detection device (2), a box-shaped frame (5) that opens toward the indoor space (1) is attached to the room wall (1a), as shown in enlarged detail in FIG. A dual type pyroelectric center (4) is attached to the bottom surface of the frame (5) as an infrared ray amount detecting means for detecting the amount of infrared rays. In addition, in the open portion facing the bottom surface on which the pyroelectric sensor (4) is attached,
A number of partial lenses (l1), (l2), arranged vertically and horizontally…
A multi-divided Fresnel lens (1) is attached. This multi-division Fresnel lens (1) has an overall shape set to a size capable of condensing infrared rays in the entire indoor space (1), and the human body detection device (2) is installed in the indoor space (1).
The rectangular small areas (A1), (A) that are subdivided in parallel (horizontal) and vertical (vertical) directions with respect to the room wall where
2), ... Infrared light condensing means for condensing infrared light from the partial detection area (A) on the pyroelectric sensor (4). In other words, each partial lens (l1) (l2), ...
Infrared rays from the small areas (A1), (A2), ... Of the indoor space (1) are focused on the pyroelectric sensor (4), respectively. Further, between each of the small areas (A1), (A2), ..., There is a non-detection area (B) where infrared rays are not focused on the partial lenses (l1), (l2) ,. , In the partial detection area (A), the human body is in the small area (A1),
When moving from (A2), ... across the non-detection area (B), the total amount of infrared light focused on the pyroelectric sensor (4) changes, so that the presence of the human body can be detected. Has been done.

Further, (15) in FIG. 3 is a shield plate provided outside the Fresnel lens (1) and having a shape following the Fresnel lens (1). The shield plate (15) is horizontally arranged at the lower end portion. It has an extended outer edge to shield the upper part of the Fresnel lens (l), and also the stepping motor (14) (fourth).
As shown in the figure, it is intermittently rotated around an axis parallel to the chamber wall (1a) to change its shielding area. That is, the number of small areas (A1), (A2), ... Included in the partial detection area (A) gradually in the vertical direction of the indoor space (1) while keeping the width of the partial detection area (A) constant. And the area of the partial detection region (A) is enlarged over the entire indoor space (1).

Further, a control device (7) for processing a signal from the pyroelectric sensor (4) is installed outside the frame (5), and the control device (7), as shown in FIG. An amplifier (8) for amplifying an infrared signal from the pyroelectric sensor (4), a filter (9) for removing noise of the infrared signal amplified by the amplifier (8), and the filter (9) The infrared signal from the reference power supply (10) is compared with the reference voltage of the reference power supply (10), and if it is equal to or higher than the reference power supply, a human body signal is output and a comparator (11) as human body detection means for detecting the presence of the human body; CPU for overall control (12)
And a drive circuit (13) which is controlled by the CPU (12) and drives the stepping motor (14).

Here, the stepping motor (14) receives the output of the drive circuit (13) and intermittently rotatably drives the shield plate (15) of the human body detection device (2) to thereby produce an indoor space (1). In the above, the belt-shaped partial detection area (A) is intermittently enlarged in a direction (vertical direction) perpendicular to the chamber wall (1a). Therefore, the shield plate (15), the drive circuit (13) and the stepping motor (14) constitute a partial area expanding means (20) for expanding the partial detection area (A) over the entire indoor space (1). ing.

Further, the CPU (12) detects a signal relating to the scanning position of the partial detection area (A) by the partial area enlarging means (20) and the presence of a human body at the position from the human body detecting means (11). The presence or absence of a human body in a specific place is determined by receiving the signal, and thus the CPU (12) has a function as a determination means.

In the partial detection area (A) of the indoor space (1),
When the partial detection area (A) is stopped while the stepping motor (14) intermittently expands the detection area in the indoor space (1), the whole or part of the human body exists in the partial detection area (A). In this case, the amount of infrared light focused on the pyroelectric sensor (4) from the partial detection area (A) is changed by the partial lenses (l1), (l2), .... When the presence of the human body is detected by the comparator (11) of the control device (7) based on the change in the light amount and a human body signal is output, the CPU (1
By 2), a human position signal indicating the presence of a human body and its location is output according to the rotational position of the stepping motor (14), and a device such as an air conditioner operates according to the human position signal. It will be. The above operation is the indoor space (1)
Is performed while being expanded from a partial region to the whole.

Therefore, in the above embodiment, the pyroelectric sensor (4) detects the amount of infrared light from a partial detection area (A) of the indoor space (1), and the presence of a person is detected based on the change in the amount of light. (Human body detection means) (11) is used for detection, and the partial detection area (A) is expanded and scanned over the entire indoor space (1). Therefore, signals relating to the presence of those human bodies (human body signals). And the signal related to the position, the indoor space (1) is not simply the entire indoor space (1).
The location of the person where the person is present will be specifically detected. Therefore, there is an effect that it can be applied to the control of a device such as an air conditioner that needs to specify the location.

Furthermore, according to the detection operation of this example, this indoor space (1)
Even if a person moves in, the number of people will not be mistaken. More specifically, as in the conventional case, the detection area is divided into four areas A to D, the field of view of the infrared sensor is set to a constant area, and the field of view of the infrared sensor is moved in the order of A, B, C, and D. In some cases, for example, when the field of view of the infrared sensor is set to B, if the person moves to the area C immediately after it is detected that there is a person in this area B, the field of view of the infrared sensor is set to C. Then, it is detected that there are people in this area C, and in reality, there is only one person in the detection area, but it is recognized that there are two people. Was becoming. However,
According to the configuration of this example, when a person moves in this way, it is detected that there is a person in the area B when the field of view of the infrared sensor is set to A and B, and then the person moves from the area B to the area. When moving to C, the field of view of the infrared sensor is A, B
When expanded to areas C and C, only the light emitting source in area B has moved to area C. Therefore, the total amount of light received by the infrared sensor (4) is recognized as one person, and areas A to
It will be detected that there is only one person in C.

For this reason, erroneous detection of the number of people due to the movement of people as in the related art is avoided, and the reliability of the human body detection device becomes extremely high.

(Effect of the Invention) As described above, according to the human body detection apparatus of the present invention, the presence of the human body is detected based on the change in the amount of infrared light from the partial area in the detection area, and the partial area is detected as Since the entire area is gradually enlarged and changed, when the amount of infrared light is increased and changed, the determination means detects that a human body is present in the enlarged partial area. , It is possible to specify and detect where in the detection area the human body exists.

Further, in particular, even when a person is moving in the detection area, it is possible to recognize the number of people in the partial area based on the total amount of infrared light detected by the infrared detecting means. The number of persons in the detection area will not be mistakenly recognized as in the case where the infrared sensor has a fixed area for moving the visual field.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention, FIG. 2 is a perspective view showing an outline of an indoor space, FIG. 3 is a side view of an infrared ray condensing unit, and FIG. 4 is a control system of a human body detecting device. It is a signal path diagram. (1) Indoor space (detection area), (A) ... partial area, (4) ... pyroelectric sensor (infrared amount detecting means),
(L) ... Multi-division Fresnel lens (infrared light condensing means),
(11) …… Comparator (human body detection means), (12) ……
CPU (judgment means), (20) ... Partial area expansion means.

Claims (1)

[Claims] 1. An infrared amount detecting means (4) installed in a detection area (1) for detecting the presence of a human body and detecting the amount of infrared light, and a partial area (A) in the detection area (1). The presence of the human body is determined based on the change in the amount of infrared light detected by the infrared light collecting means (1) for collecting the infrared light from the infrared light detecting means (4) on the infrared light quantity detecting means (4). The human body detecting means (11) for detecting and the partial area (A) on which infrared rays are condensed by the infrared condensing means (l) are detected from a part of the detection area (1) to the entire detection area (1). A partial area enlarging means (20) for enlarging and changing a region in which the human body detecting means (11) can detect the presence of the human body by gradually changing the human body detecting means (11); 2
0) The human body detection device comprising a determination means (12) for determining the presence of a human body in the detection area (1) upon receiving the output of (0).