JP2001108759A - Human body detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a human body detector capable of surely detecting a human body if it is in a squatting posture. SOLUTION: This detector outputs to the effect that it has detected a human body when the logical product of output signals of pyroelectric elements 3a, 3b is true. The elements 3a, 3b are structured so that their detection areas adjoin each other in a direction substantially perpendicular to the incoming direction of a human body. In preparation for the occasion where a human body comes in substantially parallel to a wall surface 13, amplifying circuits 8a, 8b are provided for amplifying signals from the elements 3a, 3b, and generate detection signals when the signals from the elements 3a, 3b exceed a preset threshold value. When two or more detection signals are generated within a time difference due to delay, it is judged that a human body has been detected. Or else, the elements 3a, 3b are structured so that their detection areas adjoin each other in the incoming direction of a human body and also in a direction perpendicular to the incoming direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a human body detector for detecting a human body, which is used in, for example, an automatic lighting device or a security alarm device.

[0002]

2. Description of the Related Art An automatic illuminator that turns on a light when a person enters a predetermined area and turns on a red light when an illegal intruder enters a predetermined warning area. A security alarm device that sounds an alarm buzzer uses an infrared human body detector that detects a person using a pyroelectric element.

The detection range of a conventional infrared human body detector will be described below with reference to FIGS. FIG.
It is a schematic diagram which shows the detection range of the conventional infrared type human body detector, (a) is the detection range seen from the top, (b) is the detection range seen from the front, (c) is the detection range seen from the side. It is.
FIGS. 7A and 7B are schematic diagrams showing a configuration of a lens for realizing the detection range, where FIG. 7A is a plan view, FIG.
(C) is a side view.

As shown in FIG. 6, a detection range 2e, 2f of a conventional infrared human body detector 1c is composed of a plurality of substantially square detection units, and each detection unit is provided with respect to the approach direction of the human body. They are arranged at equal intervals on two substantially vertical lines.

The reason for providing two detection ranges is that if only one detection range is provided, a detection signal may be output erroneously due to a small animal or the like.
This is because two detection ranges are provided, and a signal indicating that a human body has been detected is output only when detection is performed in both detection ranges.

The detection range can be realized by a multi-segmented Fresnel lens having a plurality of optical centers 5 shown in FIG. In order to realize the detection range shown in FIG. 6, as an example, two lenses are arranged in front and back with respect to the approach direction of the human body, and each lens has a substantially rectangular small area constituted by one row and three columns. This can be realized by using substantially arcuate lenses 4e and 4f in which two optical centers 5 are provided at equal intervals in each of the divided small areas.

On the back side (concave side) of the lenses 4e, 4f, pyroelectric elements 3a, 3b capable of inducing electric charge by temperature change due to the infrared rays collected by the lens 2e and detecting the infrared rays are provided. Have been.

Next, the configuration of a conventional infrared human body detector will be described with reference to FIG. FIG. 8 is a block diagram showing a configuration of a conventional infrared human body detector. As shown in FIG. 8, a conventional infrared human body detector includes, in addition to the lenses 4e and 4f and the pyroelectric elements 3a and 3b, amplifier circuits 8a and 8b, bandpass filters 9a and 9b, and a comparison circuit. 10a and 10b, signal output circuits 11a and 11b, and a detection logic output circuit 12 are provided.

The amplifying circuits 8a and 8b include pyroelectric elements 3a and 3b.
b) amplifies the electric charge induced by b, and outputs the signal to bandpass filters 9a and 9b, respectively. Bandpass filters 9a, 9b
Removes high-frequency and low-frequency noise contained in the signals amplified by the amplification circuits 8a and 8b, and
b.

The comparison circuits 10a and 10b generate pulses (detection signals) indicating output signal components from the amplification circuits 8a and 8b exceeding a preset threshold value. Signal output circuit 1
1a and 11b output the detection signals generated by the comparison circuits 10a and 10b to the detection logic output circuit 12.

Here, the comparison circuits 10a and 10b are provided so that the designer of the human body detector can arbitrarily prevent noise caused by electronic components in the infrared human body detector and malfunction due to heat sources other than the human body. This is because a threshold value is set for the threshold value, and the detection is performed when the threshold value is exceeded.

The detection logic output circuit 12 includes a delay time setting section 12a and a detection logic section 12b. The delay time setting unit 12a causes the detection logic unit 12b to continue the respective signals from the signal output circuits 11a and 11b for a predetermined time (delay time) arbitrarily determined by the designer of the human body detector. Is configured to be output. The detection logic unit 12b includes a delay time setting unit 12a
The logical product of the respective signals output from is obtained. If the result is true, it is determined that a human body has been detected.

Here, as shown in FIG. 9, the delay time setting unit 12a is provided so that the human body 6 first passes through the front detection range 2f and then passes through the rear detection range 2e. Therefore, if it is strictly limited to the case where the detection ranges 2f and 2e can be detected simultaneously, the logical product may not be true. For this reason, such an adverse effect is prevented by continuously outputting the detection signal for a predetermined period of time.

[0014]

In the above configuration, the two detection ranges 2e and 2f are arranged before and after in the direction of entry of the human body, and are separated by a predetermined distance without overlapping each other.

However, in such an arrangement of the detection range, as shown in FIG. 9, when the human body squats just before the wall surface 13 and becomes lower than a certain height, the rear detection range 2e is set.
, But is not detected in the previous detection range 2f,
There was a problem that the logical product could not be obtained and the detection by a small animal so that it could not be erroneously detected could become an enemy and the human body could not be detected.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a structure of a human body detector capable of reliably detecting even if a human body squats. is there.

[0017]

According to the present invention, a plurality of sensors for detecting a human body are provided, and when the logical product of at least two types of the detection signals is true, the human body is detected. In the human body detector that outputs the detection of the human body, the detection ranges of the plurality of sensors are configured such that the other detection ranges are adjacent to each other in a direction substantially perpendicular to the direction of entry of the human body.

According to a second aspect of the present invention, a plurality of sensors for detecting a human body are provided, and when the logical product of the detection signals of at least two types of sensors is true, an output indicating that a human body has been detected is provided. In the human body detector, the detection ranges of the plurality of sensors are configured such that the other detection ranges are adjacent to each other in the direction in which the human body enters and the direction perpendicular to the entry direction.

According to the third aspect of the present invention, there is provided the first aspect.
In the configuration of the invention described above, when at least two or more of the detection signals are generated within a predetermined time difference, it is determined that a human body has been detected.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A detection range of a human body detector according to the present invention will be described in detail with reference to FIGS. Here, an infrared type human body detector will be described as an example. 1A and 1B are schematic diagrams illustrating a detection range of an infrared human body detector according to a first embodiment of the present invention, wherein FIG. 1A is a detection range viewed from above, and FIG. 1B is a detection range viewed from the front. , (C) is a detection range viewed from the side. FIGS. 2A and 2B are schematic diagrams showing a configuration of a lens for realizing the detection range. FIG. 2A is a plan view, FIG. 2B is a front view, and FIG. 2C is a side view.

As shown in FIG. 1, the detection ranges 2a and 2b of the infrared human body detector 1a according to the present embodiment are such that the other detection ranges are adjacent to each other in a direction substantially perpendicular to the direction of entry of the human body. It is characterized by being constituted.

In the present embodiment, the two detection ranges 2a, 2
b, it is composed of two detection units before and after each in the approach direction of the human body, and the detection range 2a,
2b, the two detection units are arranged alternately at equal intervals on a single line substantially perpendicular to the direction of entry of the human body.

FIG. 2 shows a lens configuration for realizing the detection range.
As shown in the figure, two lenses 4a and 4b are arranged on the left and right with respect to the approach direction of the human body, and each lens 4a and 4b is provided with a substantially rectangular small area composed of two rows and three columns.
a, an optical center 5 is provided at one end (right end) of each substantially rectangular small area, while the lens 4b has an optical center 5 at the other end (left end) of each substantially rectangular small area. It is configured to use the provided substantially arcuate cylindrical lenses 4a and 4b.

In this embodiment, the two detection ranges 2
Both a and 2b are configured in three rows, but may be arranged alternately, and are not limited to three rows. Also,
In this embodiment, the detection range is configured to be symmetrical about the position where the infrared human body detector is installed, but the interval between adjacent detection ranges is equal to or smaller than the width of the human body, and is equal to or larger than a small animal. The above is sufficient, and the present invention is not limited to symmetrically disposing the detection ranges.

Furthermore, although it has been described that the detection ranges 2a and 2b are arranged at equal intervals, as described above, if the interval between adjacent detection ranges is smaller than the width of the human body and larger than the size of a small animal. It suffices to be limited to this.

Next, the configuration of the infrared human body detector used in this embodiment will be described with reference to FIGS.
5A and 5B are schematic diagrams showing a comparison between a detection range according to the first embodiment of the present invention and a detection range according to the related art. FIG. 5A is a detection range according to the present embodiment, and FIG. It is a schematic diagram which shows a range.

As shown in FIG. 5, in this embodiment, as in the prior art, the human body 6 is moved to one of the detection ranges 2f.
After passing through the other detection range 2e, the detection is performed simultaneously in the two detection ranges 2a and 2b. Therefore, the configuration of the conventional infrared human body detector shown in FIG. The time setting unit 12a can be omitted.

The above description has been made on the assumption that the human body enters the wall 13 substantially perpendicularly.
When approaching from a direction substantially parallel to the above, similar to a conventional infrared human body detector, first, it passes through the previous detection range 2a and then passes through the next detection range 2b. If it is limited to the case where 2a and 2b can be detected simultaneously, the logical product may not be true.

Therefore, in consideration of such a situation, one of the detection signals is continuously output for a predetermined period of time in the same manner as in the case of the conventional infrared human body detector.
A delay time setting unit 12a may be provided so that a logical product can be obtained reliably.

[Second Embodiment] Hereinafter, a second embodiment according to the present invention will be described with reference to FIGS. FIG. 3 is a schematic diagram showing a detection range of an infrared human body detector according to the second embodiment of the present invention, and (a).
Is a detection range viewed from above, (b) is a detection range viewed from the front, and (c) is a detection range viewed from the side. FIG.
FIGS. 3A and 3B are schematic diagrams illustrating a configuration of a lens that realizes the detection range, wherein FIG. 3A is a plan view, FIG. 3B is a front view, and FIG.

The present embodiment is created as a countermeasure when the vehicle enters from the horizontal direction (entry direction B). As shown in FIG. 3, the infrared type human body detector 1b of the present embodiment The detection ranges 2c and 2d are based on the approach direction of the human body,
It is characterized in that the other detection ranges are adjacent to each other in a direction perpendicular to the approach direction.

In this embodiment, the two detection ranges 2c, 2c
d, the detection units in the detection ranges 2c and 2d are alternately arranged before and after the approach direction of the human body (the approach direction A), and the two types of detection units are in the approach direction of the human body. Are arranged alternately and at equal intervals on one line substantially perpendicular to.

That is, the approach direction of the human body (the approach direction A)
And in the direction perpendicular to the approach direction A (the approach direction B),
The detection units of the detection ranges 2c and 2d are arranged alternately and at equal intervals.

The lens configuration for realizing the detection range is shown in FIG.
As shown in the figure, two lenses 4c and 4d are disposed on the left and right with respect to the approach direction of the human body, and each lens 4c and 4d is provided with a substantially rectangular small area composed of two rows and three columns. Use a shaped lens.

In the first row of the lens 4c, the optical center 5 is provided at one end (left end) of each of the substantially rectangular small areas, and in the second row, each of the substantially rectangular small areas is provided. The optical center 5 is provided at the other end (right end).

On the other hand, on the first line of the lens 4d, an optical center 5 is provided at one end (right end) of each of the substantially rectangular small regions, and on the second line, each of the substantially rectangular small regions is provided. The optical center 5 is provided at the other end (left end).

In the above embodiment, the description has been made assuming that a cylindrical lens is used. However, a Fresnel lens or the like used in the prior art may be used, or the detection range may be adjusted using a flat lens or a mirror. It may be realized.

Although the two detection ranges have been described as being realized by using a pyroelectric element which is a passive infrared sensor, the detection range may be constituted by an ultrasonic sensor or an active infrared sensor.
Other sensors, such as a combination of a dynamic infrared sensor and an active infrared sensor or a combination of a passive infrared sensor and an ultrasonic sensor, may be used.

Here, the active infrared sensor detects infrared rays by a combination of an infrared light emitting diode and an infrared photodiode.

Further, the detection logic output circuit 12 has been described as being composed of the delay time setting section 12a and the detection logic section 12b. However, after one of the signals from the signal output circuits 11a and 11b is output. , Start measuring time,
If the other signal is output before the delay time elapses, an output indicating that a human body has been detected may be output.

[0041]

As described above, according to the first aspect of the present invention, even if the human body squats down to a certain height just below the wall and becomes lower than a certain height, one of the detections is performed as in the prior art. Since detection can be performed in both detection ranges without detecting only the range, a human body can be reliably detected.

Further, since detection can be performed simultaneously in both detection ranges, the delay time setting section used in the prior art can be omitted, and the cost can be reduced.

According to the second aspect of the present invention, even when the human body enters from a direction substantially parallel to the wall surface, the first aspect of the present invention can be applied.
As in the described invention, detection can be performed in both detection ranges without detection in only one detection range, so that an effect of reliably detecting a human body can be achieved.

According to the third aspect of the present invention, a first aspect is provided.
In addition to the effects of the described invention, when at least two or more detection signals are generated within a predetermined time difference, it is determined that a human body has been detected, so that the human body is substantially parallel to the wall surface. When entering from a certain direction, firstly detecting only in one detection range and later detecting in the other detection range, since the signal detected first is continuously output to the detection logic output circuit, The logical product can be made true without error, and the human body can be reliably detected even when the human body enters from a direction substantially parallel to the wall surface.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a detection range of an infrared human body detector according to a first embodiment of the present invention, where (a) is a detection range viewed from above, and (b) is a detection range viewed from the front. ,
(C) is a detection range viewed from the side.

2A and 2B are schematic diagrams illustrating a configuration of a lens that realizes a detection range in FIG. 1, where FIG. 2A is a plan view, FIG.
(C) is a side view.

3A and 3B are schematic diagrams illustrating a detection range of an infrared human body detector according to a second embodiment of the present invention, wherein FIG. 3A is a detection range viewed from above, and FIG. ,
(C) is a detection range viewed from the side.

4A and 4B are schematic diagrams illustrating a configuration of a lens that realizes the detection range of FIG. 3, where FIG. 4A is a plan view, FIG.
(C) is a side view.

FIG. 5 is a schematic diagram showing a comparison between a detection range according to the first embodiment of the present invention and a detection range according to the related art.

6A and 6B are schematic diagrams showing a detection range of a conventional infrared human body detector, wherein FIG. 6A is a detection range viewed from above, FIG. 6B is a detection range viewed from the front, and FIG. This is the detection range seen.

7A and 7B are schematic diagrams illustrating a configuration of a lens that realizes the detection range in FIG. 6, where FIG. 7A is a plan view, FIG.
(C) is a side view.

FIG. 8 is a block diagram showing a configuration of a conventional infrared human body detector.

FIG. 9 is a side view showing a detection range of an infrared human body detector in the related art.

[Explanation of symbols]

 1a Infrared human body detector (human body detector) 1b Infrared human body detector (human body detector) 2a Detection range 2b Detection range 2c Detection range 2d Detection range 3a Pyroelectric element (infrared sensor) 3b Pyroelectric element (infrared sensor) Reference Signs List 4a lens (optical system) 4b lens (optical system) 4c lens (optical system) 4d lens (optical system) 12 detection logic output circuit 12a delay time setting unit 12b detection logic unit

Claims (3)

[Claims] 1. A human body detector comprising: a plurality of sensors for detecting a human body, wherein when a logical product of detection signals of at least two types of sensors is true, the human body detector outputs an indication that a human body has been detected. A human body detector, wherein the detection range of the sensor is configured such that the other detection ranges are adjacent to each other in a direction substantially perpendicular to the approach direction of the human body. 2. A human body detector, comprising: a plurality of sensors for detecting a human body, wherein when a logical product of detection signals of at least two types of sensors is true, the human body detector outputs an indication that a human body has been detected. A human body detector, wherein the detection range of the sensor is configured such that other detection ranges are adjacent to each other in a direction in which a human body enters and a direction perpendicular to the approach direction. 3. The method according to claim 2, wherein at least two or more of the detection signals are:
2. The human body detector according to claim 1, wherein when it occurs within a predetermined time difference, it is determined that a human body has been detected.