JP3264089B2 - 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 apparatus for detecting a moving human body by collecting infrared rays.

[0002]

2. Description of the Related Art FIG. 10 and FIG.
FIG. 10 is a diagram showing a conventional human body or the like detection device disclosed in JP-A-134593, FIG. 10 is a block diagram showing a configuration of the human body detection device, and FIG. 11 is a time chart showing its operation.

In FIG. 10, reference numeral 1a denotes an infrared detector 2a.
1b is a detection area detected only by the infrared detector 2b, and 1c is a detection area detected only by the infrared detector 2b.
Both of b are detection areas to be detected redundantly. The infrared detectors 2a and 2b detect infrared rays of an object in the detection areas 1a to 1c and output signals. 3a and 3b are amplification means for amplifying the output signals of the infrared detectors 2a and 2b;
Comparators 71a and 71b compare the amplified signal with a reference, output an H signal indicating that an object is detected when the signal exceeds the reference, and output an L signal when the signal is below the reference.
2a is an AND circuit for inputting the output of the comparator 71a and the inverted output of the comparator 71b inverted by the inverter 73b;
b is an AND circuit for inputting the inverted output of the comparator 71a inverted by the inverter 73a and the output of the comparator 71b;
Is an AND circuit for directly receiving the outputs of the comparators 71a and 71b.

Next, the operation of the conventional human body detecting device will be described.
Description will be made based on the time chart of FIG. In FIG. 11, (a) shows an output signal of the comparator 71a,
(B) shows an output signal of the comparator 71b. (C)-
(E) shows the output signals of the AND circuits 72a to 72c.
Here, for example, when an infrared source such as a human body moves only in the detection area 1a, a change in the infrared light in the detection area 1a is focused only on the infrared detector 2a, and the output signal of the infrared detector 2a fluctuates. This signal is amplified by the amplifying means 3a and binarized by the comparator 71a to become an H signal 75a. On the other hand, since there is no change in the infrared ray in the detection areas 1b and 1c, the output of the infrared ray detector 2b does not change,
1b becomes the L signal 76a. In such a combination of the outputs of the comparators 71a and 71b, the AND circuit 72a
Is an H signal 77a, and the AND circuits 72b and 72c are output as L signals 78a and 79a. As a result, an operation of detecting that a human body has moved in the detection area 1a is performed.

Similarly, when the human body moves only in the detection area 1b, the comparator 71a becomes the L signal 75b, the comparator 71b becomes the H signal 76b, the AND circuit 72a becomes the L signal 77b, and the AND circuit 72b becomes the H signal. 78b, the AND circuit 72c becomes the L signal 79b, and the operation for detecting that the human body has moved in the detection area 1b is performed.

If the human body moves only in the overlap detection area 1c, the comparators 71a and 71b both become H signals 75c and 76c, and the AND circuit 72
a and 72b are L signals 77c and 78c, AND circuit 7
2c becomes the H signal 79c, which is an operation of detecting that the human body has moved in the detection area 1c.

Here, if there is a difference in sensitivity between the infrared detectors 2a and 2b or a deviation of the overlap detection area 1c,
Since the timing at which each of the comparators 71a and 71b changes to the H signal or the L signal is shifted, the overlap detection area 1c
May not be distinguished from human body movement in

If a human body moves at the same time in the positions of the detection areas 1a and 1b, the comparators 71a and 71b both output H signals, so that it is erroneously determined that the human body has moved in the detection area 1c. Become.

As described above, in the conventional human body detecting apparatus, when a human body moves in a certain detection area, the individual human body is detected by combining the binary output of the comparator as the output signal generating means corresponding to the infrared detector. Is detected.

[0010]

In the conventional human body detecting apparatus as described above, it is impossible to distinguish between a case where the human body moves in the detection areas 1a and 1b at the same time and a case where the human body moves in the detection area 1c. there were. In addition, since the actual infrared detectors have different sensitivities, and the sensitivities of the respective infrared detectors are different depending on the position in the detection area where the human body has moved, there is a difference in the signal generation time. However, it is difficult to determine the moving human body in the overlapping detection area. Therefore, it is necessary to select an infrared detector having the same sensitivity as much as possible, and it is necessary to adopt a configuration in which the sensitivities of the overlapping detection areas become optically equal. Therefore, when manufacturing an infrared detector, the number of inspection steps is increased, the yield is deteriorated, and further, the manufacturing accuracy is required,
There was a problem that the price was high.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and a plurality of infrared detectors having detection areas partially overlapping with each other can determine the position of the human body when the human body moves at the same time. It is an object to obtain a possible human body detection device. It is another object of the present invention to provide a human body detection device that can reduce the influence on the accuracy of discrimination due to the difference in sensitivity of the infrared detector or the deviation of the optical system, reduce the manufacturing cost, and be configured at low cost.

[0012]

A human body detecting apparatus according to a first aspect of the present invention has a predetermined detection area partially overlapping each other, detects infrared rays due to the movement of a human body in this detection area, and outputs a signal. A plurality of infrared detectors to be output, a plurality of peak detectors provided respectively corresponding to the plurality of infrared detectors, and a plurality of peak detectors for detecting a peak of an output signal of the corresponding infrared detector; When a peak is detected, the peak value is compared with the output value of the output signal of the other infrared detector to determine a detection area where the human body has moved.

A human body detecting apparatus according to a second aspect of the present invention has a plurality of infrared detecting sections each having a predetermined detecting area partially overlapping each other, detecting infrared rays caused by the movement of a human body in the detecting area, and outputting a signal. And a plurality of peak detectors provided corresponding to the plurality of infrared detectors, respectively, for detecting peaks of output signals of the corresponding infrared detectors, and provided corresponding to the plurality of infrared detectors, respectively. A plurality of level determining means for determining the level of the output signal of the corresponding infrared detector, and when any of the peak detecting means detects a peak, the peak value and the output signal of the other infrared detector are detected. Comparing means for comparing the output value with the output value, and determining the detection area in which the human body has moved based on the comparison result and the level determined by the level determining means.

[0014] In the human body detection device according to the third invention,
The comparison / determination means includes a timer for measuring a predetermined time, and peak information holding means for holding information input by the comparison / determination means when any of the peak detection means detects a peak within the predetermined time. The detection area where the human body has moved is determined based on at least one peak information held in the peak information holding means.

[0015] In the human body detecting apparatus according to a fourth aspect of the present invention,
The comparison determination means includes a timer for measuring a predetermined time, and determines a detection area in which a human body has moved based on information on a first peak detected by any of the peak detection means within the predetermined time. .

In the human body detecting device according to a fifth aspect,
The comparison / determination means includes a timer for measuring a predetermined time, and peak information holding means for holding information input by the comparison / determination means when any of the peak detection means detects a peak within the predetermined time. The detection area where the human body has moved is determined based on the information of the last peak held in the peak information holding means.

In the human body detecting device according to a sixth aspect,
The comparison / determination means includes a timer for measuring a predetermined time, and peak information holding means for holding information input by the comparison / determination means when any of the peak detection means detects a peak within the predetermined time. The detection area where the human body has moved is determined based on the average value of the information held in the peak information holding means for each of the infrared detectors.

According to a seventh aspect of the present invention, there is provided a human body detection device, comprising: a comparison result holding unit for holding a determination result of the comparison determination unit;
Determining means for determining the detection area in which the human body has moved for each predetermined unit based on the determination result held in the comparison result holding means.

The human body detecting device according to an eighth aspect of the present invention is provided with a timer for measuring a predetermined time, and the discriminating means detects that the human body has moved every predetermined time based on the discrimination result held in the comparison result holding means. The area is determined.

A ninth aspect of the present invention is a human body detecting apparatus, comprising: zero cross detecting means for detecting a zero cross in which the output signal waveform of the infrared detector crosses a reference value of the infrared detector. The detection area in which the human body has moved for each zero cross is determined based on the determination result held in the result holding means.

[0021]

In the human body detecting apparatus according to the first aspect of the present invention, the plurality of infrared detectors each having a predetermined detection area partially overlapping each other detect infrared rays due to movement of the human body within the detection area and output a signal. Then, the comparison determining means, when any of the plurality of peak detecting means provided corresponding to the plurality of infrared detectors detects the peak of the output signal of the corresponding infrared detector, this peak Compare the value with the output value of the output signal of the other infrared detector,
The detection area where the human body has moved is determined.

In the human body detecting device according to the second invention,
A plurality of infrared detectors each having a predetermined detection area that partially overlaps each other, detects infrared rays due to the movement of the human body in the detection area, outputs a signal, and the comparison and determination unit outputs the signals to the plurality of infrared detectors. When one of the plurality of peak detecting means provided correspondingly detects the peak of the output signal of the corresponding infrared detector, this peak value and the output value of the output signal of the other infrared detector are detected. And the detection area where the human body has moved is determined based on the comparison result and the level of the output signal of the infrared detector determined by the plurality of level determination means.

In the human body detecting device according to the third invention,
The comparison determination means measures a predetermined time by a timer, and when any of the peak detection means detects a peak within the predetermined time, holds the information input by the comparison determination means in the peak information holding means. The detection area in which the human body has moved is determined based on the held information at least at one peak.

[0024] In the human body detecting device according to the fourth invention,
The comparison determining means measures a predetermined time by a timer, and determines a detection area in which the human body has moved based on information on a first peak detected by any of the peak detecting means within the predetermined time.

[0025] In the human body detection device according to the fifth invention,
The comparison determination means measures a predetermined time by a timer, and when any of the peak detection means detects a peak within the predetermined time, holds the information input by the comparison determination means in the peak information holding means. The detection area where the human body has moved is determined based on the held information at the time of the last peak.

In the human body detecting device according to a sixth aspect,
The comparison determination means measures a predetermined time by a timer, and when any of the peak detection means detects a peak within the predetermined time, holds the information input by the comparison determination means in the peak information holding means. An average value of the held information is obtained for each of the infrared detectors, and a detection area where a human body has moved is determined based on the average value.

[0027] In the human body detecting apparatus according to the seventh invention,
The determination means stores the determination result of the comparison determination means in the comparison result storage means, and determines the detection area in which the human body has moved for each predetermined unit based on the determination result stored in the comparison result storage means.

[0028] In the human body detection device according to the eighth invention,
The timer measures a predetermined time, and the determining means determines the detection area in which the human body has moved at predetermined time intervals based on the determination result held in the comparison result holding means.

In the human body detecting device according to the ninth aspect,
The zero-cross detection means detects a zero-cross where the output signal waveform of the infrared detector crosses the reference value of the infrared detector, and the discrimination means determines whether or not a human body is generated for each zero cross based on the discrimination result held in the comparison result holding means. The moved detection area is determined.

[0030]

【Example】

Embodiment 1 FIG. FIG. 1 is an overall block diagram of a human body detection device according to a first embodiment of the present invention. In FIG. 1, 1a is a detection area detected only by the infrared detector 2a, 1b is a detection area detected only by the infrared detector 2b, and 1c is a detection area detected by both the infrared detectors 2a and 2b in an overlapping manner. . The infrared detector 2a has detection areas 1a and 1c.
The infrared detector 2b detects infrared rays such as a human body in the detection area 1b and outputs a signal. The infrared detector 2b detects infrared rays such as a human body in the detection areas 1b and 1c and outputs a signal. Reference numeral 2 denotes an infrared detection unit having infrared detectors 2a and 2b. Reference numeral 3a denotes amplifying means for amplifying the output signal of the infrared detector 2a, and 3b denotes amplifying means for amplifying the output signal of the infrared detector 2b. 4a is a peak detecting means for detecting the peak of the output voltage waveform output from the amplifying means 3a, and 4b is a peak detecting means for detecting the peak of the output voltage waveform output from the amplifying means 3b. The peak detecting means 4a differentiates the output voltage waveform output from the amplifying means 3a and outputs the differentiated output voltage waveform, and the differential value 0 detection which detects that the differential value output by the differential output generating means 5a is 0 Means 6a, the differential value being positive,
When the value changes in the order of 0 and negative, or when the differential value is negative,
When it changes in the order of 0 and positive, a peak detection signal is output. Similarly, the peak detecting means 4b includes a differential output generating means 5b for differentiating and outputting the output voltage waveform output from the amplifying means 3b, and a differential value 0 detecting means 6b, and the differential value is 0.
A peak detection signal is output when. 7 is an amplifying means 3a
And 3b which calculate the difference between the voltage values of the output voltage waveforms output from the output voltage waveforms, output an H signal when the difference is equal to or more than a predetermined value, and output an L signal when the difference is less than the predetermined value. Output means. Reference numeral 9 denotes a comparison / determination unit that receives the outputs of the peak detection units 4a and 4b and the output of the differential output unit 7 and determines which detection area 1a to 1c the human body is moving based on a combination of these outputs. Numeral 10 is a sending means for appropriately sending out the judgment result of the comparing and judging means 9 by a necessary method. In FIG. 1, the infrared detection unit 2 and the detection area 1
a to 1c are shown enlarged.

FIG. 2 is an explanatory diagram showing an example of the configuration of a detection area indicated by oblique lines. In FIG. 2, reference numeral 11 denotes an optical system constituting a detection area. The optical system 11 has a detection area 1a where only the infrared detector 2a detects, a detection area 1b where only the infrared detector 2b detects, and an infrared detector 2
Both a and 2b constitute a detection area 1c in which overlapping detection is performed.

FIG. 3 is an explanatory diagram showing a positional relationship between a detection area and an example of human body movement. In FIG. 3, reference numeral 12 denotes a human body, and arrow 13 denotes a movement path of the human body.

Next, the configuration of the detection area in FIGS. 2 and 3 will be described in detail. As the optical system 11 that realizes such a detection area system, there is a multi-segment lens having a plurality of optical centers, for example, a multi-segment Fresnel lens. Here, since the detection areas 1a to 1c are obtained by projecting the light receiving surfaces of the infrared detectors 2a and 2b spatially symmetrically with respect to the optical center as a target central point. , A plurality of projection planes, that is, detection areas can be configured. Providing a light shielding plate between the infrared detectors 2a and 2b in order to avoid stray light in the detection area between the infrared detectors 2a and 2b does not prevent the effect of the present invention.

In the first embodiment, the infrared detectors 2a and 2a
The optical center is arranged to configure the detection area in the center direction in order to realize the overlapping detection area 1c of FIG.
As can be seen from the above, there is a portion where the detection area 1c is displaced and does not overlap very close to the infrared detectors 2a and 2b. This is because the infrared detectors 2a and 2b are at physically different positions. To avoid this, a more complicated optical system 11 must be provided.

However, if the detection areas 1a to 1c to be detected are configured as shown in FIG. 3 with respect to the human body 12 to be detected, the deviation of the detection area 1c becomes relatively small so as to be negligible. In particular, the complicated optical system 11 need not be configured.

FIG. 4 is an operation waveform diagram of each means of the first embodiment with respect to the human body movement path 13 as shown in FIG. 4A shows an output voltage waveform 14a of the infrared detector 2a.
15a is a reference voltage of the infrared detector 2a, 16a
16d are the peaks of the output voltage waveform 14a of the infrared detector 2a. (B) shows the output voltage waveform 14b of the infrared detector 2b, 15b shows the reference voltage of the infrared detector 2b,
17c to 17f are output voltage waveforms 14 of the infrared detector 2b.
This is the peak of b. (C) is a peak detection time chart of the peak detection means 4a for the output voltage waveform 14a,
(D) shows the peak detecting means 4 for the output voltage waveform 14b.
b, a peak detection time chart, (e) a differential output time chart of the differential output means 7 based on a difference between the voltage values of the output voltage waveform 14a and the output voltage waveform 14b, and (f), a human body has moved in the detection area 1a. And (g) is a time chart of the result output determined by the comparing and determining means 9 that the human body has moved in the detection area 1b, and (h) is a time chart of the result output determined by the comparing and determining means 9 in the detection area 1c. 6 is a time chart of an output result of a determination made by the comparison determination means 9 as having moved.

Hereinafter, the operation of the human body detecting apparatus shown in FIG. 1 will be described in detail with reference to the situation where the time chart of FIG. 4 is obtained when the human body moves as shown in FIG.

First, the flow of signals in the human body detection device shown in FIG. 1 will be described. In FIG. 1, an infrared detector 2
a detects infrared rays in the detection areas 1a and 1c, and the infrared detector 2b detects infrared rays in the detection areas 1b and 1c.
The detected infrared rays are converted into electric signals by the infrared detectors 2a and 2b, respectively, and output to the amplifiers 3a and 3b. Each of the amplifiers 3a and 3b amplifies a predetermined frequency band with a predetermined gain (amplification factor). The amplified signal is
For example, output voltage waveforms 14a, 14a as shown in FIG.
b. In other words, the waveform swings up and down the predetermined reference voltages 15a and 15b.

The output voltage waveforms 14a and 14b are output to the plurality of peak detecting means 4a and 4b and the differential output means 7, respectively.

More specifically, the comparison / determination means 9 determines the peaks 16a to 16a in the output voltage waveform 14a of the infrared detector 2a.
16d, and when the output signal of the differential output means 7 at this time is an H signal, it is determined that the human body is moving in the detection area 1a. The output voltage waveform 14 of the infrared detector 2b
b, peaks 17c to 17f are detected, and when the output signal of the differential output means 7 at this time is an H signal, it is determined that the human body is moving in the detection area 1b. Further, peaks 16a to 16d or 17c to 17f are detected in the output voltage waveform 14a or 14b of the infrared detector 2a or 2b,
If the output signal of the differential output means 7 at this time is an L signal, it is determined that the human body is moving in the detection area 1c.

The above is the signal flow in the human body detection device shown in FIG.

Next, the output voltage waveform and signal flow when the human body moves as shown in FIG. 3 will be described with reference to the operation waveform diagram of FIG. As shown in FIG. 3, it is assumed that the human body 12 moves on a moving route 13. That is, the infrared detector 2
It is assumed that the detection area 1a, then the detection area 1c, and then the detection area 1b are moved in order of about 3m from.

First, the human body 12 enters the detection area 1a. At this time, since the change of the infrared ray is focused only on the infrared detector 2a, the output voltage waveform 14a fluctuates only on the infrared detector 2a. Next, the human body 12 is placed in the detection area 1c.
Enters, both of the infrared detectors 2a and 2b receive a change in infrared light, and the output voltage waveforms 1 of both infrared detectors 2a and 2b
4a and 14b fluctuate. Here, the detection area 1c is
Since they substantially overlap, the outputs of the infrared detectors 2a and 2b fluctuate almost synchronously in terms of time and voltage.
Next, when the human body 12 enters the detection area 1b, the change in the infrared light is focused only on the infrared detector 2b, so that the output voltage waveform 14b changes only on the infrared detector 2b.

Therefore, output voltage waveforms 14a and 14b as shown in FIG. 4 are output. This output voltage waveform 14
The operation of the peak detecting means 4a, 4b, the differential output means 7, and the comparing / determining means 9 with respect to a and 14b will be described below with reference to FIG.

First, the peak detecting means 4a outputs the output voltage waveform 14 of the infrared detector 2a by the differential output generating means 5a.
is differentiated, and at the time of peak 16a, the differential value 0 detecting means 6
When a differential value of 0 is detected based on a, the peak detection signal 18
a is output to the comparison determination means 9. At this point, the differential output means 7 finds the difference between the voltage value of the peak 16a and the voltage value 17a of the output voltage waveform 14b. At this time,
The voltage value 17a of the output voltage waveform 14b is equal to the reference voltage 15b.
Therefore, the difference from the voltage value of the peak 16a is larger than a predetermined value. Therefore, the differential output means 7 outputs the H signal 20a to the comparison / determination means 9. Here, the comparison determining means 9 outputs a human body movement signal 21a in the detection area 1a from the output information.

Next, the peak detecting means 4a detects the peak 16b of the infrared detector 2a and outputs a peak detection signal 18b to the comparing / determining means 9 by the same processing as described above. Since the difference between the voltage value of the peak 16b and the voltage value 17b of the output voltage waveform 14b is larger than a predetermined value, the differential output means 7 outputs the H signal 20b. Therefore, the comparison determination means 9 outputs the human body movement signal 21b in the detection area 1a.

Next, peaks 16c and 17c are sequentially detected. At this time, the output voltage waveform 1 of the infrared detector 2a
4a is substantially synchronized with the output voltage waveform 14b of the infrared detector 2b, there is almost no difference in amplitude at this point, and the differential output means 7 outputs the L signal 20c. Therefore, the comparison / determination means 9 outputs the human body movement signal 23c in the detection area 1c.
Is output.

Next, peaks 16d and 17d are sequentially detected. Here, the same processing as described above is performed, and the differential output means 7 outputs the L signal 20d, so that the comparison determination means 9 outputs the human body movement signal 23d in the detection area 1c.

Next, the peak 17e of the infrared detector 2b is detected. At this time, the output voltage waveform 14a of the infrared detector 2a has been output, and has a voltage value substantially equal to the reference voltage 15a. For this reason, the differential output means 7
A signal 20e is output, and the comparison / determination means 9 outputs the detection area 1b.
And outputs the human body movement signal 22e.

Next, the peak 17f of the infrared detector 2b is detected. Here, the same processing as described above is performed, and the differential output means 7 outputs an H signal 20f, and the comparison and determination means 9 outputs a human body movement signal 22f in the detection area 1b.

As described above, the human body 12 moves to the detection area 1
When the detection areas 1c and 1b are moved in order from a, the comparison determination means 9 can sequentially obtain the detection areas 1a, 1a, 1c, 1c, 1c, 1c, 1b, and 1b as the determination result of the human body movement.

When the human body moves in the detection areas 1a and 1b at the same time, since it is rare that the human bodies move at the same time, the output voltage waveforms of the infrared detectors 2a and 2b are shifted. Therefore, when the detection area 1b is obtained next to the detection area 1a as the determination result, or when the detection area 1b is obtained.
b, when the detection area 1a is obtained, the detection area 1a
It can be determined that the human body has moved at the same time by 1 and 1b.

Next, the sending means 10 inputs the result of the judgment by the comparing and judging means 9 and sends it out as appropriate in a required manner. As a transmission method, for example, one configuration is to transmit a human body movement signal in a pulsed manner every time a human body movement signal is obtained.
One is to keep holding the human body movement signal until the human body movement signal changes, and send it out when it changes. The other is to hold the human body movement signal every time the human body movement signal changes, When the human body movement signal changes within this time, the timer is reset to hold a new human body movement signal, and is transmitted when the timer counts up. These configurations may be appropriately configured according to the unit that uses the output of the human body detection device.

As described above, according to the first embodiment, when a peak is detected by the peak detecting means 4a, 4b, which of the infrared detectors 2a, 2b detected the peak, and the differential output Based on the difference between the output voltage values of the infrared detectors 2a and 2b obtained by the means 7, the detection areas 1a to 1c to which the human body has moved are determined, so that the human body moves in the overlap detection area 1c or in the area other than the overlap detection area 1c. It is possible to determine whether the human body has moved or the human body has moved simultaneously in areas other than the plurality of overlapping detection areas 1c. Further, the determination of the human body movement in the overlap detection area 1c is made by the infrared detector 2
a and 2b are hardly affected by the sensitivity difference.

The differential output means 7 outputs the output voltage waveform 1
The same effect can be obtained by outputting the difference between the voltage values 4a and 14b and comparing the difference between the voltage values in the comparison determination means 9 to determine whether the difference is equal to or greater than a predetermined value. In this case, the comparison determination means 9 can determine whether the difference between the voltage values is large or small. The differential output means 7 outputs the output voltage waveform 14
The same effect can be obtained even if the voltage values of a and 14b are output to the comparison / determination means 9 and the comparison / determination means 9 determines the difference between the voltage values and compares whether the difference between the voltage values is equal to or greater than a predetermined value. . In this case, the comparison determination means 9 can determine whether the sign of the voltage value is positive or negative.

Further, in the first embodiment, two infrared detectors 2a and 2b, two peak detectors 4a and 4b,
Although an example in which one differential output means 7 is provided is shown, two or more infrared detectors may be provided. In this case, the same number of peak detectors as the infrared detectors are required. Are required for the number of combinations of a plurality of infrared detectors.

Embodiment 2 FIG. FIG. 5 is an overall block diagram of a human body detecting device according to a second embodiment of the present invention. Components similar to those of the first embodiment shown in FIG.

In FIG. 5, 8a and 8b respectively output an H signal when the output voltage waveform output from the amplifying means 3a and 3b has an amplitude greater than or equal to a predetermined value with respect to the reference voltage, and outputs an H signal. Level determination means for outputting an L signal when the amplitude is. Infrared detector 2 shown in FIG.
The output voltage waveforms 14a and 14b of a and 2b are input to a plurality of peak detecting means 4a and 4b, a plurality of level determining means 8a and 8b, and a differential output means 7, respectively.

The level judging means 8a, 8b also functions as a filter for avoiding malfunction of peak detection due to noise for signals having amplitudes smaller than a predetermined value in the output voltage waveforms 14a, 14b of the infrared detectors 2a, 2b. I do.

In the second embodiment, the comparison determining means 9
Output of peak detecting means 4a, 4b, level determining means 8
The outputs of a and 8b and the output of the differential output means 7 are input, and a signal indicating which of the detection areas 1a to 1c the human body is moving is output by a combination of these outputs.

Next, the operation will be described with reference to the operation waveform diagram of FIG. The comparing and determining means 9 detects the peaks 16a to 16d of the infrared detector 2a by the peak detecting means 4a, and when the output of the level determining means 8b to the infrared detector 2b is an L signal, the human body movement in the detection area 1a. Output a signal. Further, peaks 17c-1 of the infrared detector 2b
If the signal 7f is detected and the output of the level determination means 8a to the infrared detector 2a is an L signal, a human body movement signal in the detection area 1b is output. Further, the peaks 16a to 16d and 17c to 17f of the infrared detector 2a or 2b are detected, the outputs of the level determining means 8a and 8b are both H signals, and the output signal of the differential output means 7 is L level. In the case of a signal, a human body movement signal in the detection area 1c is output.
Also, peaks 16a to 16 of the infrared detector 2a or 2b
d, 17c to 17f, and level determining means 8
a and 8b are both H signals and the output signal of the differential output means 7 is an H signal, the detection areas 1a and 1b
At b, a human body movement signal indicating that the human body has moved at the same time is output.

When the human body moves at the same time in the detection areas 1a and 1b, it is very rare that the human body moves at the same time. Therefore, the output voltage waveforms of the infrared detectors 2a and 2b are shifted, and the difference between the output voltage values is small. Since the value is equal to or more than the predetermined value, the differential output means 7 outputs the H signal.

As described above, the comparison and judgment means 9 in the second embodiment outputs the outputs of the level judgment means 8a and 8b and the output of the differential output means 7 when the peaks are detected by the peak detection means 4a and 4b. By using, it is possible to determine whether a plurality of human bodies have moved simultaneously in areas other than the overlap detection area or whether the human bodies have moved in the overlap detection area, and the determination of the human body detection area can be made with high accuracy.

Embodiment 3 FIG. FIG. 6 is an overall block diagram of a human body detecting apparatus according to a third embodiment of the present invention. Components similar to those of the first embodiment shown in FIG.

In FIG. 6, reference numeral 25 denotes time information at the time of detection of a peak, peak detection infrared detector information, that is, information on which infrared detector 2a or 2b detected a peak, and output voltage waveform information. That is, it is a peak information holding unit that holds a peak voltage value, an output voltage value of another infrared detector, a differential output result, and the like. 26 is a peak detection timer means for monitoring whether a peak is detected within a predetermined time after a certain peak is detected, and resetting and restarting monitoring when a peak is detected within a predetermined time. . Also, the peak detection timer means 26
Counts up after a predetermined time has elapsed and stops.
The comparison determining means 9 includes the peak information holding means 25 and the peak detection timer means 26.

FIG. 7 is a waveform chart for explaining the selection of waveform information by the comparison / determination means 9. In FIG. 7, 27a indicates an output voltage waveform of the infrared detector 2a, and 27b indicates an output voltage waveform of the infrared detector 2b. 28 is an infrared detector 2
a, 2b reference voltage, 29 is the peak voltage value of the infrared detector 2a, 30 is the peak voltage value of the infrared detector 2b, 31
Is the output voltage value of the infrared detector 2b when the infrared detector 2a is at a peak, 32 is the output voltage value of the infrared detector 2a when the infrared detector 2b is at a peak, and 33 is a predetermined time monitored by the peak detection timer means 26. is there.

In the third embodiment, in order to determine the human body movement detection area based on at least one piece of peak information detected within a predetermined time, the peak voltage value 29, which is the information at the time of peak detection shown in FIG. 30, output voltage value 3
1, 32, etc. are all held in the peak information holding means 25.

Next, the operation will be described with reference to FIG. When the peak detection timer means 26 counts up, the comparison / determination means 9 uses the peak information held in the peak information holding means 25 at that time, for example, the peak information having the largest peak voltage value, Is determined based on the peak voltage of the infrared detector and the output voltage of another infrared detector at that time. In FIG. 7, the discrimination is made based on the peak information of the peak voltage value 29, that is, the information on the peak voltage value 29 and the output voltage value 31, and the information on the peak voltage value 30 and the output voltage value 32 is not used for the discrimination. In this case, since the voltage difference between the peak voltage value 29 and the output voltage value 31 is within a predetermined value, the differential output result held in the peak information holding means 25 is an L signal. Therefore, the comparison determination means 9 of the first embodiment
In the same manner as in the method of determining
c is determined only once.

It is to be noted that, instead of using the maximum value as the peak information as described above, a peak having a large differential value may be selected. Further, if the determination is performed by, for example, a majority decision method based on all pieces of peak information within a predetermined time held in the peak information holding means 25, it is possible to perform the determination with higher accuracy.

As described above, according to the third embodiment, the output voltage waveform information to be compared can be appropriately selected in accordance with the state of the waveform, so that the determination with high redundancy, that is, the infrared detector 2a , 2b, or the positional deviation of the optical system 11 due to manufacturing, the infrared detector 2a,
It is possible to make a determination that is hardly affected by an overlay error of the overlap detection area 1c due to a displacement of the mounting position of the 2b.

In the third embodiment, the peak information holding means 25 and the peak detection timer means 26 have been described as being provided in the comparison and judgment means 9 of the first embodiment shown in FIG. It can also be provided in the comparison determining means 9 of the second embodiment, and in this case, the same effect as described above can be obtained.

Embodiment 4 FIG. The human body detection device according to the fourth embodiment of the present invention has the same configuration as the human body detection device according to the third embodiment shown in FIG. However, the comparison determination means 9 determines the detection area where the human body has moved based on the information at the time of the first peak detected by either the peak detection means 4a or 4b within a predetermined time. In the case of the waveform diagram of FIG.
9 and the output voltage value 31, and the peak voltage value 30
And the output voltage value 32 is not held. Therefore, in the fourth embodiment, the peak information holding unit 25 is unnecessary.

Next, the operation will be described with reference to FIG. The comparison and determination means 9 first detects the first peak,
That is, the human body movement detection area is determined using the peak voltage value 29 of the infrared detector 2a and the output voltage value 31 of the other infrared detector 2b at that time. In this case, since the voltage difference between the peak voltage value 29 and the output voltage value 31 is within a predetermined value, the human body movement detection area is determined to be the detection area 1c as in the first embodiment. Next, until the peak detection timer 26 counts up, no determination is made even if a peak is detected. Alternatively, a timer may be provided in the peak detecting means 4a, 4b, and the peak detection itself may not be performed until the timer counts up.

As described above, according to the fourth embodiment, since the discrimination is immediately performed using the information of the first peak detected within the predetermined time, the output of the discrimination result is quick, and the discrimination with good response is possible. Becomes Further, the peak information holding means 25
Is not particularly required, the configuration of the device is simplified, and a small and inexpensive human body detection device can be obtained.

Embodiment 5 FIG. The human body detecting device according to the fifth embodiment of the present invention has the same configuration as the human body detecting device according to the third embodiment shown in FIG. However, the comparison determination means 9 makes a determination based on information on the last peak detected by either the peak detection means 4a or 4b within a predetermined time.

Next, the operation will be described with reference to FIG. The comparison determination means 9 first holds the peak voltage value 29 and the output voltage value 31, which are the information of the peak detected first, in the peak information holding means 25, and starts the peak detection timer means 26. Next, the peak voltage value 30 and the output voltage value 32, which are the information at the time of the peak detected within the predetermined time, are replaced with the above-described peak information and stored in the peak information holding means 25. Thereafter, the human body movement detection area is determined using the peak information held when the peak detection timer means 26 counts up, that is, the peak voltage value 30 of the infrared detector 2b and the output voltage value 32 of the infrared detector 2a. I do. In this case, since the voltage difference between the peak voltage value 30 and the output voltage value 32 is within a predetermined value, the human body movement detection area is determined to be the detection area 1c as in the first embodiment.

As described above, according to the fifth embodiment, when a plurality of peaks occur within a predetermined time, it is determined using the information of the last peak detected within the predetermined time.
Accurate determination can be made with peak information closer to the end of the movement, and the peak information holding means 25 replaces the held information each time a peak is detected, so that the capacity can be reduced and relatively inexpensive and highly accurate determination is possible. Becomes

Embodiment 6 FIG. The human body detection device according to the sixth embodiment of the present invention has a configuration in which the differential output means 7 in the configuration of the human body detection device according to the third embodiment shown in FIG. 6 is omitted. The comparison / determination means 9 receives the signals amplified by the amplification means 3a and 3b, and sets the peak information holding means 2 within a predetermined time.
An average value of the output voltage values of the infrared detectors 2a or 2b held at 5 is calculated, and a human body movement detection area is determined based on a difference between the average values. In the case of the waveform diagram of FIG. 7, the peak voltage values 29 and 30 and the output voltage value 3
1, 32, etc. are all held in the peak information holding means 25.

Next, the operation will be described with reference to FIG. The comparison determination means 9 first holds the peak voltage value 29 and the output voltage value 31, which are the information of the peak detected first, in the peak information holding means 25, and starts the peak detection timer means 26. Next, the peak voltage holding unit 25 holds the peak voltage value 30 and the output voltage value 32 which are the information of the next peak detected within the predetermined time. When the peak detection timer means 26 counts up, the comparison determination means 9 calculates the average value of the peak voltage value 29 and the output voltage value 32 for the infrared detector 2a, and calculates the output voltage value 31 for the other infrared detector 2b. Calculate the average value of the peak voltage value 30,
Find the difference between their averages. Next, if the comparison determination means 9 performs the same processing as the differential output means 7 in the first or second embodiment and processes the difference between the average values in the same manner as the differential voltage value obtained by the differential output means 7, The same discrimination as in the first or second embodiment can be performed.

As described above, according to the sixth embodiment, all information on peaks detected within a predetermined time is stored in the peak information holding means 25 and discrimination is performed based on the average value. Influences of components such as electrical noise, a difference in sensitivity between the infrared detectors 2a and 2b, and an overlap deviation of the detection area 1c can be effectively removed, and extremely stable discrimination can be performed.

Embodiment 7 FIG. FIG. 8 is an overall block diagram of a human body detection device showing a seventh embodiment of the present invention. The same components as those in the second embodiment shown in FIG.

In FIG. 8, reference numeral 9a denotes the peak detecting means 4.
a, 4b, the output of the differential output means 7 and the output of the level determination means 8a, 8b, and a comparison means for determining which of the detection areas 1a to 1c the human body is moving based on a combination of these outputs. is there. 34 is a comparison result holding means for holding the human body movement signals of the detection areas 1a to 1c output by the comparison means 9a, 35 is a judgment unit judgment means for determining a judgment unit, and 9b is a comparison result holding means 34 and a judgment unit judgment means. And a determination means for comprehensively determining the human body detection area from the comparison result held in the comparison result holding means.

FIG. 9 is an explanatory diagram showing a discrimination unit in the discrimination means 9b. 9A shows output voltage waveforms 36a and 36b of the infrared detectors 2a and 2b obtained when the human body reciprocates several times in the detection area 1c.
37 is a reference voltage for the infrared detectors 2a and 2b.
(B) shows the peak detecting means 4 for the output voltage waveform 36a.
5A shows a time chart of the peak detection position of FIG.
38h is a peak detection timing. (C) shows a time chart of the peak detection position of the peak detection means 4b with respect to the output voltage waveform 36b, and 39a to 39h are peak detection timings. (D) shows a discrimination time chart when one waveform unit is used as a discrimination unit from the start to the end of the waveform, and 40a is a discrimination timing. (E) shows a discrimination time chart when the discrimination unit is a fixed time, and 41a to 41d are discrimination timings. (F) shows a discrimination time chart when the discrimination unit is every zero cross, and 42a to 42f are discrimination timings. The discrimination timing indicates that discrimination is performed at the timing of ▽ in the figure from the comparison result held between the chart signals during the H signal.

The operation will be described below with reference to FIGS.

First, the signal flow in the human body detecting device shown in FIG. 8 is obtained by comparing the outputs of the infrared detectors 2a and 2b with the comparing means 9.
The steps up to a are the same as those of the second embodiment already described. The discriminating means 9b stores the comparison result obtained by the comparing means 9a in the comparison result holding means 34, and performs comprehensive discrimination from the comparison result held when a certain predetermined discriminating condition is satisfied. Things.

For example, one of the comprehensive discrimination methods is a majority decision method for deciding a discrimination in the detection areas 1a to 1c which are discriminated most among comparison results in a discrimination unit. Is a determination method that determines the determination by assigning a weight to the most recent comparison result.

First, each peak detection timing 38 shown in FIG.
a to 38c, 38e to 38h, 39a to 39c, 39e
This shows how the comparison result of the comparing means 9a becomes from 39h to 39h. At each peak detection timing, as shown in FIG. 9, since the output voltage waveforms 36a and 36b have an amplitude greater than or equal to a predetermined value with respect to the reference voltage 37, the level determination means 8a and 8b output an H signal. Further, the output voltage waveform 36a of the infrared detector 2a and the output voltage waveform 36b of the infrared detector 2b are substantially synchronized, and there is almost no difference in amplitude at this time. Output. Therefore, the comparison means 9a outputs a human body movement signal in the detection area 1c at any of the peak detection timings, similarly to the comparison determination means 9 of the second embodiment.

Next, the peak detection timings 38d and 3d
In 9d, as shown in FIG. 9, since the output voltage waveforms 36a and 36b have an amplitude greater than or equal to a predetermined value with respect to the reference voltage 37, both the level determination means 8a and 8b output the H signal. Further, since the difference between the amplitudes of the output voltage waveform 36a and the output voltage waveform 36b is large, the output signal of the differential output means 7 is an H signal. Therefore, the comparison means 9a is provided with the detection areas 1a and 1b similarly to the comparison determination means 9 of the second embodiment.
Outputs a human body movement signal at the same time when the human body moves.

The discriminating means 9b holds the result of comparison by the comparing means 9a in the comparison result holding means. The determination unit determination unit 35 determines the determination unit based on the held comparison result for each waveform shown in FIG. 9D, and does not use the determination units in FIGS. 9E and 9F. .
The discriminating means 9b determines the discrimination timing 40 when one waveform ends.
Assuming that a decision is made by a majority method in a,
At each peak detection timing, as described above, most are determined to be the detection area 1c, so the detection area 1c is determined.

Next, the transmitting means 10 receives the result of the discrimination by the discriminating means 9b and appropriately transmits a human body movement signal in the same manner as in the first embodiment.

As described above, according to the seventh embodiment, the comparison result of the comparison means 9a is held in the comparison result holding means 34, and the comparison results of the comparison means 9a are collectively determined for each waveform. Contains a waveform that is likely to be erroneously determined due to a difference in sensitivity between the infrared detectors 2a and 2b, etc.
More accurate discrimination becomes possible.

Embodiment 8 FIG. The human body detecting device according to the eighth embodiment of the present invention has the same configuration as the human body detecting device according to the seventh embodiment shown in FIG. However, the discrimination unit determination means 35 is provided with a timer for measuring a predetermined time, and the predetermined time shown in the determination time chart of FIG. The comparison results thus obtained are determined and determined collectively in a predetermined time unit. Therefore, in the eighth embodiment, the determination timing 41a shown in FIG.
In the case of .about.41d, four determinations are made.

The timer of the determination unit determination means 35 starts when the output voltage waveforms of the infrared detectors 2a and 2b have an amplitude greater than or equal to a predetermined value with respect to the reference voltage. And ends.

Next, the operation will be described with reference to FIG. If the determination at the determination timings 41a to 41d is performed by the majority method, the result at the peak detection timings 38a, 38b, 39a, and 39b is determined and determined by majority at the first determination timing 41a. Also at the detection timing, the human body movement detection area is the detection area 1c as described in the seventh embodiment, and as a result, the detection area 1c is determined. Second determination timing 41b
Then, the peak detection timings 38c, 38d, 39c,
The result at 39d is determined by majority decision, and as described in the seventh embodiment, the peak detection timing 38c
And 39c, the detection area 1c and the peak detection timings 38d and 39d are simultaneous human body movements in the detection areas 1a and 1b, so that no discrimination result is obtained. Similarly, the third time (determination timing 41c) and the fourth time (determination timing 4c)
1d) is determined as the detection area 1c. Therefore,
The first to fourth results are determined as the detection area 1c, no determination result, the detection area 1c, and the detection area 1c.

As described above, according to the eighth embodiment, the comparison result of the comparison means 9a is held in the comparison result holding means 34, and the discrimination is made in the predetermined time unit measured by the timer provided in the discrimination unit judgment means 35. Since the determination is performed, the time at which the result is obtained is accurate, and the method is suitable for applications in which the signal of the human body detection device is read at a fixed cycle. In addition, it is possible to eliminate erroneous determination included in the middle by determining several results collectively.

The timer of the discrimination unit judgment means 35
For example, the process may be started when a peak is detected, and may be terminated after a predetermined time has elapsed as a determination timing. Alternatively, it is also possible to repeat starting at a predetermined time, ending at a predetermined time, generating a determination timing signal, and restarting at that time.

Embodiment 9 FIG. The human body detection device according to the ninth embodiment of the present invention has the same configuration as the human body detection device according to the seventh embodiment shown in FIG. However, the determination unit determination means 35 is provided with a timer for measuring a predetermined time, the zero cross shown in the determination time chart of FIG. 9F is used as the determination unit, and the determination means 9b is the comparison result stored in the comparison result storage means 34. The results are determined and determined collectively in units of zero crossings. Therefore, in the ninth embodiment, the determination timing 42a shown in FIG.
In the case of .about.42f, the determination is made six times.

Hereinafter, description will be made with reference to FIG. There are three types of zero crosses in the ninth embodiment. These are referred to as a start zero cross, a normal zero cross, and an end zero cross. The starting zero cross point indicates a point where the output voltage waveforms 36a and 36b rise. The detection condition of the starting zero cross is
It is assumed that the amplitude of the output voltage waveform is equal to or greater than a predetermined value, and that the amplitude of the output voltage waveform is equal to or less than a predetermined value within a predetermined period of time. Normally, the zero crossing corresponds to the output voltage waveforms 36a, 3a
The point at which the reference voltage 37 intersects the output voltage waveforms 36a and 36b when the 6b swings. Normally, the zero-crossing detection condition is a point at which the amplitude of the output voltage waveform changes from positive or 0 to negative, or a point at which the amplitude of the output voltage waveform changes from negative to positive or 0 and before that. It is assumed that the amplitude of the output voltage waveform is equal to or larger than a predetermined value within a predetermined time. The end zero crossing is performed by the output voltage waveforms 36a and 36b.
Converges and returns to the vicinity of the reference voltage 37. The end zero-cross detection condition is a point satisfying that the amplitude of the output voltage waveform is equal to or less than a predetermined value and that the amplitude of the output voltage waveform is equal to or less than a predetermined value within a predetermined time before that. Discrimination unit determination means 35 in the ninth embodiment
Measures a predetermined time by a timer,
This is a means for detecting these three types of zero crossings by inputting the output voltage waveforms 36a and 36b output from b.

The unit of discrimination is every zero-cross when one of the infrared detectors 2a and 2b outputs a waveform, and when both the infrared detectors 2a and 2b output a waveform. The time point at which the output voltage waveforms 36a and 36b of the infrared detectors 2a and 2b both zero-cross at least once or more is used as a unit of determination. In FIG. 9, since the infrared detectors 2 a and 2 b output waveforms, the determination timings 42 a to 42 f at the time when the output voltage waveforms 36 a and 36 b zero-cross at least once become a unit of determination.

Here, if the determination at the determination timings 42a to 42f is performed by a majority decision method, the peak detection timings 38a and 39 are obtained at the first determination timing 42a.
The result at a is determined by majority decision, and the detection area becomes the detection area 1c as described in the seventh embodiment at any peak detection timing. Therefore, the detection area 1c is determined as a result. Similarly, the detection area 1c is used at the second and subsequent discrimination timings 42b to 42f.

As described above, according to the ninth embodiment, the comparison result of the comparison means 9a is held in the comparison result holding means 34, and the zero-crossing which is the break of the movement of the human body detected by the judgment unit judgment means 35 is judged. , The human body movement information can be determined without omission in synchronization with the change in movement, and the accuracy of the determination is increased.

[0102]

As described above, according to the first aspect, when one of the peak detecting means detects a peak, the comparing / determining means compares the peak value with the value of the other infrared detector. The detection value is compared with the output value of the output signal to determine the detection area where the human body has moved, so that the human body moves in the overlap detection area, the human body moves outside the overlap detection area, or the human body moves outside the multiple detection areas. It is possible to determine whether or not have moved simultaneously. Further, there is an effect that the determination of the movement of the human body in the overlap detection area is hardly influenced by the sensitivity difference of the infrared detector.

According to the second invention, when any one of the peak detecting means detects a peak, the comparing / determining means compares the peak value with the output value of the output signal of the other infrared detector. The detection area where the human body has moved is determined based on the comparison result and the level determined by the level determination means.
It is possible to determine whether the human body has moved outside the overlap detection area or whether the human body has moved simultaneously outside the plurality of overlap detection areas. Further, there is an effect that the determination of the movement of the human body in the overlap detection area is hardly influenced by the sensitivity difference of the infrared detector.

According to the third aspect, the comparing and judging means measures a predetermined time by a timer, and when any one of the peak detecting means detects a peak within the predetermined time,
The information input by the comparison determination means is held in the peak information holding means, and the detection area where the human body has moved is determined based on the held information at least one of the peaks. The discrimination has an effect of being less affected by an error in the overlapping detection area due to a difference in sensitivity of the infrared detector, a positional shift of the optical system caused by manufacturing, a positional shift of the infrared detector, or the like.

According to the fourth aspect of the invention, the comparing and judging means measures a predetermined time by a timer, and detects a human body based on information on a first peak detected by any of the peak detecting means within the predetermined time. Since the detection area that has moved is determined, a peak information holding unit that holds information at the time of the peak is not required, and the configuration can be simplified. it can. In addition, when a human body moves in the overlap detection area, a shift in the peak occurrence time of the output voltage waveform of the infrared detector, which is caused by a shift in the overlap detection area or a difference in sensitivity of the infrared detector, can be absorbed, and accurate determination can be performed. Becomes possible.

According to the fifth aspect, the comparing and judging means measures a predetermined time by a timer, and when any of the peak detecting means detects a peak within the predetermined time,
The information input by the comparison determination means is stored in the peak information storage means, and the detection area in which the human body has moved is determined based on the stored information at the time of the last peak. Distinction becomes possible,
The accuracy of discrimination against complicated continuous human body movement is improved. In addition, when the human body moves in the overlap detection area, it occurs due to a shift in the overlap detection area or a difference in sensitivity of the infrared detector.
The deviation of the peak occurrence time of the output voltage waveform of the infrared detector can be absorbed, and highly accurate discrimination can be performed.

According to the sixth aspect, the comparison determination means measures a predetermined time by a timer, and when any of the peak detection means detects a peak within the predetermined time,
The information input by the comparison determination means is stored in the peak information storage means, and the detection area where the human body has moved is determined based on the average value of the stored information for each of the infrared detectors. The noise included in the human body movement waveform, the sensitivity difference of the infrared detector, and the output difference due to the displacement of the detection area can be effectively cancelled, and more accurate discrimination becomes possible.

According to the seventh aspect, the discriminating means holds the discrimination result of the comparison discriminating means in the comparison result holding means, and for each predetermined unit based on the discrimination result held in the comparison result holding means. Since the detection area in which the human body has moved is determined, the position of the human body can be determined in consideration of the direction of movement of the human body, the number of times of movement, and the like, and more accurate determination is possible.

According to the eighth aspect, the predetermined time is measured by the timer, and the determination means determines the detection area where the human body has moved at predetermined time intervals based on the determination result held in the comparison result holding means. Therefore, the position of the human body can be determined at an arbitrary interval, and there is an effect that handling of the determination result becomes convenient.

According to the ninth aspect, the zero-cross detector detects a zero-cross where the output signal waveform of the infrared detector crosses the reference value of the infrared detector.
Since the determination means determines the detection area in which the human body has moved at each zero cross based on the determination result held in the comparison result storage means, it is possible to determine the human body movement information in synchronism with the change in movement and without omission. This has the effect of increasing the accuracy of the determination.

[Brief description of the drawings]

FIG. 1 is an overall block diagram of a human body detection device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a configuration example of a detection area according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a positional relationship between a detection area and a movement of a human body according to the first embodiment of the present invention.

FIG. 4 is an operation waveform diagram of each means in the first embodiment of the present invention.

FIG. 5 is an overall block diagram of a human body detection device according to a second embodiment of the present invention.

FIG. 6 is an overall block diagram of a human body detection device according to a third embodiment of the present invention.

FIG. 7 is a waveform chart for explaining selection of waveform information in Embodiment 3 of the present invention.

FIG. 8 is an overall block diagram of a human body detection device according to a seventh embodiment of the present invention.

FIG. 9 is an explanatory diagram showing a discrimination unit in Embodiment 7 of the present invention.

FIG. 10 is a block diagram showing a configuration of a conventional human body detection device.

FIG. 11 is a time chart showing the operation of the conventional human body detection device.

[Explanation of symbols]

 1a, 1b Detection area 1c Duplicate detection area 2a, 2b Infrared detector 3a, 3b Amplifying means 4a, 4b Peak detecting means 5a, 5b Differential output generating means 6a, 6b Differential value 0 detecting means 7 Differential output means 8a, 8b Level Determination means 9 comparison determination means 9a comparison means 9b determination means 10 sending means 25 peak information holding means 26 peak detection timer means 34 comparison result holding means 35 determination unit determination means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01V 8/12 G01J 1/42

Claims (9)

(57) [Claims] 1. A plurality of infrared detectors each having a predetermined detection area which partially overlaps, detecting infrared light due to movement of a human body in the detection area, and outputting a signal, and the plurality of infrared detectors A plurality of peak detecting means for detecting the peak of the output signal of the corresponding infrared detector, and when any of the peak detecting means detects a peak, this peak value and the other A human body detection device, comprising: comparison means for comparing an output value of an output signal of an infrared detector with a detection area in which a human body has moved. 2. A plurality of infrared detectors each having a predetermined detection area partially overlapping each other, detecting infrared light due to movement of a human body in the detection area, and outputting a signal, and the plurality of infrared detectors A plurality of peak detecting means for detecting the peak of the output signal of the corresponding infrared detector, and the output signal of the corresponding infrared detector provided for each of the plurality of infrared detectors When one of the peak detecting means detects a peak, the peak value is compared with the output value of the output signal of the other infrared detector. A human body detection device comprising: comparison determination means for determining a detection area in which a human body has moved based on a result and a level determined by the level determination means. 3. The comparison / determination means includes a timer for measuring a predetermined time, and peak information holding information input by the comparison / determination means when any of the peak detection means detects a peak within the predetermined time. 3. The human body detecting device according to claim 1, further comprising a holding unit, wherein the detection area in which the human body has moved is determined based on at least one peak information held in the peak information holding unit. 4. The comparison determining means includes a timer for measuring a predetermined time, and detects a detection area in which a human body has moved based on information on a first peak detected by any of the peak detecting means within the predetermined time. The human body detection device according to claim 1, wherein the determination is performed. 5. The comparison / determination means includes: a timer for measuring a predetermined time; and peak information holding information input by the comparison / determination means when any of the peak detection means detects a peak within the predetermined time. 3. The human body detecting device according to claim 1, further comprising a holding unit, wherein the detection area in which the human body has moved is determined based on the information on the last peak held in the peak information holding unit. 6. The comparison / determination means includes a timer for measuring a predetermined time, and peak information holding information input by the comparison / determination means when any of the peak detection means detects a peak within the predetermined time. 3. The human body according to claim 1, further comprising a storage unit, wherein the detection area in which the human body has moved is determined based on an average value of the information stored in the peak information storage unit for each of the infrared detectors. Detection device. 7. A comparison result holding means for holding the judgment result of the comparison judgment means, and a judgment means for judging a detection area in which a human body has moved for each predetermined unit based on the judgment result held in the comparison result holding means. The human body detection device according to claim 1 or 2, further comprising: 8. A timer for measuring a predetermined time is provided, wherein the determination means determines a detection area in which a human body has moved at predetermined time intervals based on a determination result held in the comparison result holding means. The human body detection device according to claim 7. 9. A zero-crossing detecting means for detecting a zero crossing in which the output signal waveform of the infrared detector crosses a reference value of the infrared detector, wherein the determining means detects a determination result held in the comparison result holding means. 8. The human body detecting device according to claim 7, wherein a detection area in which the human body has moved is determined for each zero cross based on the detection area.