JP2001330684A - Infrared detector and load control device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infrared detector having high accuracy that can detect a human body in a stationary state or with little movement, and a load control device which requires no wasteful load operation. SOLUTION: When a human detection signal from both detection parts A, B is not being outputted, the threshold of a detecting part A is set to Va1 of a high output side, and when the human detecting signal from the part B is being outputted, the threshold of the part A is changed the Va1 to Va2 of a low output side by the detecting information which is under the control of a control part 4. The human body is detected, and the human detecting signal is outputted during operating the part A at the threshold Va2. Then the threshold of the part A is returned to the value on the high output side under the control of the part 4, when the human detecting signal is outputted again from the part B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared detecting device for detecting the presence of a human body by detecting infrared light emitted from the human body, and a load control device using the same.

[0002]

2. Description of the Related Art Conventionally, an infrared type human body detecting device using a pyroelectric element as an infrared detecting element has been developed.

[0003] Although this infrared detecting element is a method of detecting a temperature change in a detection area, it can continuously output a detection output when a human body is operating.
If the human body stops (rests) in the detection area or moves little, the detection output cannot be output. The movement of a person is usually 0.3 m / s to 1.0 m / s, and at most 2.0 m / s.

Accordingly, the frequency characteristic of the amplifier is often designed with a center frequency of about 1 Hz, though it depends on the structure of the infrared detecting element and the shape of the lens. However, a circuit that is slightly moving in the detection area (stationary state) is not detected by a circuit designed with 1 Hz as the center frequency, and is not detected despite being present in the detection area. Output results. For this reason, for example, when the lamp load is controlled, there is a possibility that a problem such as turning off the light may occur even though the human body exists in the detection area.

Therefore, conventionally, as a method for solving the above-mentioned problem, as shown in FIG. 26A, a signal obtained by amplifying the detection output of the infrared detecting element detects either the + side threshold Va or the −side threshold Va. When the detection section detects a human body detection signal from the detection section as shown in FIG.
As shown in FIG. 6 (c), the function of the retriggerable timer holds the human body detection state for a certain period of time from the input of the human body detection signal,
Even if the output of the human body detection signal is lost, the setting is made so that the lamp load does not immediately turn off as shown in FIG.

In the example disclosed in Japanese Patent Laid-Open Publication No. Hei 6-3366, the threshold value of the output level to be compared with the detection output of the pyroelectric infrared detecting element is at least ±
A threshold value ± Va and a threshold value ± Vb on the low output level side are set, and in the normal setting state where it is determined that a human body is not present in the detection area, the two types are set as shown in FIG. The threshold value Va on the high output level side is compared with the range of the threshold value Va on the high output level side (hereinafter, simply referred to as the threshold value Va unless otherwise specified) and the level of the infrared detection signal of the infrared detection element. After the infrared detection signal of the infrared detection element exceeding the threshold is output, the threshold value on the low output level side ± Vb
(A threshold Vb at the end unless otherwise noted) is compared with the level of the infrared detection signal of the infrared detection element.

FIG. 27 (b) is a timing chart for selecting the threshold value, FIG. 27 (c) shows an extended state of a human body detection signal by a retriggerable timer from the time of human body detection, and FIG. FIG. 27 (e) shows a relay signal for driving the load control relay off when the detection signal rises, and FIG. 27 (e) shows a relay signal for driving the load control relay off when the human body detection signal falls, and T indicates the extension time.

In the example shown in Japanese Patent Application Laid-Open No. 4-164217, a passive sensor using a pyroelectric infrared detecting element is used. This sensor has a lower frequency than the internal noise of the pyroelectric infrared detecting element. And a filter that passes
It comprises a high-gain amplifier circuit for amplifying the filter output, and a bandpass filter that passes a frequency component having a frequency lower than the upper internal noise and equal to or higher than a certain lower limit.

[0009]

In the conventional example described with reference to FIG. 26, when the fixed time is set short, the human body is still in the detection area at the time when the counting of the fixed time is completed. However, since there is no detection output from the infrared detecting element, the illumination is turned off, which causes a problem.

If the predetermined time is set to be long, the operation of the load is unnecessarily continued even when the human body is not present in the detection area. Will be lost.

In the conventional example described with reference to FIG. 27, two thresholds corresponding to a high output level and a low output level are provided for one infrared detecting element. It is difficult to set the trigger condition to change to the threshold (in the above, a fixed time is provided),
If a threshold period on the low output level side is provided needlessly, even if the detection output has a small output level, it is determined that this is a human body detection, and it reacts to sudden changes in ambient temperature, etc. There is a problem that the possibility of erroneous detection is high.

In the last-mentioned conventional example, the control is usually performed by using one infrared detecting element whose center frequency is set in a low frequency range which is susceptible to disturbance noise (such as fluctuation of sunlight). It has been very difficult to further amplify the dark noise of the element and extract the original detection output that is not disturbance noise or dark noise. Even if control is performed with a conventional configuration having two values of a center frequency and a center frequency in a low frequency range, accurate detection information can be obtained if the output at the center frequency in the low frequency range is caused by noise. There is a problem that cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a high-precision infrared detection apparatus capable of detecting a stationary state or a human body with little motion without erroneous detection. Another object of the present invention is to provide a load control device that does not uselessly operate a load.

[0014]

In order to achieve the above-mentioned object, the invention according to claim 1 is provided separately for each of the first and second detection areas, and detects infrared rays from the corresponding detection areas. First and second infrared detecting elements for receiving and outputting infrared detecting signals having output levels corresponding to the change in the amount of received light, and first and second amplifying the detecting signals output from these infrared detecting elements, respectively. A first amplifying unit including a second amplifying unit, and first and second comparing units that are provided corresponding to the amplifying units and that compare a detection signal output from the corresponding amplifying unit with a predetermined threshold value; An infrared detection device that outputs a human body detection signal when a level of an infrared detection signal output by a corresponding infrared detection element exceeds a threshold value, wherein each of the detection units includes a second detection unit. When a human body is detected, the threshold value of the first detection unit , Characterized by lower than the threshold of the second detection unit.

According to a second aspect of the present invention, in the first aspect of the present invention, the first detecting section has at least two threshold values having a magnitude relationship with each other, and before the second detecting section detects a human body, The determination is performed using the larger first threshold, and after the second detector detects the human body, the determination is performed using the smaller second threshold.

According to a third aspect of the present invention, in the second aspect of the present invention, when the first detector outputs a human body detection signal when the first detector is operating with the second threshold set. ,
The threshold set by the first detector is changed from the second threshold to the first threshold.

According to a fourth aspect of the present invention, in the second aspect of the present invention, when the first detector is operating with the second threshold set, the first detector no longer outputs a human body detection signal. Then, after a lapse of a predetermined time, the threshold of the first detection unit is changed from the second threshold to the first threshold.

According to a fifth aspect of the present invention, in the second aspect of the invention, when the first detector is operating with the second threshold set, the first detector and the second detector are both operated. In both cases, when the human body detection signal is no longer output, the threshold of the first detection unit is changed from the second threshold to the first threshold.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the center frequency of the frequency-gain characteristics of the first and second amplifying units is set to be equal to the center frequency of the first amplifying unit. The frequency is set to be lower than the center frequency, and the first detector is a stationary correspondence detector and the second detector is a movement correspondence detector.

The invention of claim 7 is characterized in that, in the invention of claim 1 or 6, the first detector is driven from the time when the second detector outputs a human body detection signal.

According to an eighth aspect of the present invention, in the first or the sixth aspect of the present invention, when the first detection section is operating, the first detection section outputs a human body detection signal from the second detection section. Is stopped.

According to a ninth aspect of the present invention, in the first or the sixth aspect of the present invention, the operation of the first detector is stopped after a lapse of a predetermined time since the first detector no longer outputs the human body detection signal. It is characterized by the following.

According to a tenth aspect of the present invention, in the first or sixth aspect of the present invention, the operation of the first detection unit is stopped when the first detection unit and the second detection unit no longer output a human body detection signal. It is characterized by doing.

According to an eleventh aspect of the present invention, in the invention of the sixth aspect, the amplifying section of the first detecting section has at least two center frequencies having a magnitude relationship with each other, and the second detecting section detects a human body. Before the operation, the operation is performed at the lower first center frequency, and after the second detector detects the human body, the operation is performed at the higher second center frequency.

According to a twelfth aspect of the present invention, in the eleventh aspect, when the second detector outputs the human body detection signal while the amplifier of the first detector operates at the first center frequency. , From the first center frequency to the second center frequency.

According to a thirteenth aspect, in the eleventh aspect, the first detector outputs the human body detection signal in a state where the amplifier of the first detector operates at the first center frequency. After a lapse of a fixed time from the stop, the first center frequency is changed to the second center frequency.

According to a fourteenth aspect, in the eleventh aspect, the first detection unit and the second detection unit are connected to each other when the amplification unit of the first detection unit operates at the first center frequency. When the human body detection signal is no longer output from, the first center frequency is changed to the second center frequency.

According to a fifteenth aspect of the present invention, in the first or the sixth aspect, the first detector operates at a low output side threshold and a low frequency side center frequency.

According to a sixteenth aspect, in the first aspect, the first detection ridge area and the second detection area overlap each other.

The invention of claim 17 is characterized in that, in the invention of claim 1, the first detection ridge area and the second detection area do not overlap.

According to an eighteenth aspect of the present invention, there is provided the infrared detecting device according to any one of the first to seventeenth aspects, wherein output to a load is performed in accordance with a human body detection signal output from the first and second detection units. A control unit for outputting a control signal to be adjusted is provided, and the load output is controlled by a control signal from the control unit.

The invention of claim 19 is characterized in that, in the invention of claim 18, the load is a lamp load.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.

(Embodiment 1-1) As shown in FIG. 1, this embodiment detects a far infrared ray emitted from a human body and outputs a voltage signal having a level corresponding to the amount of the infrared ray as an infrared detection signal. Of infrared detecting elements 1A and 1B, amplifying sections 2A and 2B for amplifying infrared detecting signals output from infrared detecting elements 1A and 1B, and amplified infrared rays output from respective amplifying sections 2A and 2B. Comparison units 3A and 3B for comparing the detection signals with threshold values Va and Vb; a control unit 4 for outputting a control signal for load control based on the human body detection signals output from these comparison units 3A and 3B; And a load output control device 5 for controlling the load output in accordance with the control signal of 4. The lamp output is used as a load 6 controlled by the load output control device 5 to constitute a lighting device as a whole. . The first detecting section A (hereinafter simply referred to as detecting section A) is converted into a first detecting section A (hereinafter simply referred to as detecting section A) by the infrared detecting element 1A, the amplifying section 2B, and the comparing section 3A.
The comparison section 3B constitutes a second detection section B (hereinafter simply referred to as detection section B).

The amplification sections 2A and 2B are used to amplify the infrared detection signals output from the pyroelectric infrared detection elements 1A and 1B so that the changes can be detected because the infrared detection signals are weak. The infrared detection signal to be amplified is amplified around the offset voltage Vof. Further, since the movement of a person to be detected is about 0.3 m / s to 1.0 m / s, the amplification sections 2A and 2B have a center of about 1 Hz depending on the element structure and lens shape. The one having a frequency characteristic as a frequency is used. When the connected infrared detecting elements 1A and 1B detect a human body and output an infrared detection signal, the amplification sections 2A and 2B amplify the infrared detection signal around the offset voltage Vof, and amplify the infrared detection signal. Generates an output that fluctuates up and down around the center. Here, as shown in FIG. 2, the infrared detection signals from the infrared detecting elements 1A and 1B have a large output level when there is a large movement such that the human body moves (a section), and conversely, they are in a stationary state. In this case (section (b)), the output level is low, and when it is necessary to detect them separately, it is necessary to set Vb as the high output side and Va as the low output side as the threshold for detection.

The comparators 3A and 3B provide the offset voltage Vof
The threshold is set at a predetermined voltage level on the plus and minus sides of the threshold, and the presence or absence of human body detection is determined by the level of the amplified infrared detection signal input to these thresholds being higher or lower. If there is a human body detection, a human body detection signal is output to the control unit 4.

The control unit 4 is constituted by a microcomputer or the like, controls the load output control device 5 based on the human body detection signal from the detection unit A or B, and controls the second
The function of setting the threshold value of the detection unit A based on the information of the detection unit B is provided.

The comparing sections 3A and 3B may be processed by a software program using signal processing means using a CPU or the like, or may be a threshold setting circuit for setting a threshold, and a threshold and a level of the infrared detection signal. And a comparison circuit for comparing
Hardware processing may be performed so that the threshold value from the threshold value setting circuit is input to the comparison circuit.

Here, the detection area X of the detection sections A and B
As shown in FIG. 3, a and Xb are concentric spaces having the same height and different bottom diameters, and even when both regions Xa and Xb overlap, FIGS. Or a case where they are dispersed so that they do not overlap each other when viewed from above, or as shown in FIG. 4C. In particular, the detection area Xa corresponding to the detection unit A for which a low-level threshold is set as described later is an area corresponding to a small amount of human movement or a stillness.

The threshold value of the detection section B is slightly lower than the maximum level of the infrared detection signal output when the human body crosses the corresponding detection area Xb as shown in FIG. Is set to a value Vb higher than the output level of the infrared detection signal output due to rapid temperature change of

As shown in FIG. 5C, two threshold values Va1 and Va2 are set in advance as the threshold value of the other detector A.
The threshold value Va1 is the same level as the threshold value Vb of the detection unit B, and the threshold value Va2 is a value lower than the threshold value Vb of the detection unit B, and is output when the human body performs an appropriate operation in the detection area Xa. Be lower than the level of the infrared detection signal.

When the human body detection signal is not output from both the detection units A and B, the threshold value of the detection unit A is set to Va1, and the infrared detection signal of the infrared detection element 1B is set to the + side threshold Vb. When the detection unit B outputs the human body detection signal as shown in FIG. 5B, the threshold of the detection unit A is changed from Va1 to Va under the control of the control unit 4 based on the detection information.
Change to 2.

When the detection unit A is operating at the threshold value Va2, the human body enters the detection area Xa, and the detection unit A outputs a human body detection signal as shown in FIG. Then, when the infrared detection signal of the infrared detection element 1B again exceeds the threshold Vb on the + side and the detection unit B outputs a human body detection signal, the threshold of the detection unit A is set to Va1 under the control of the control unit 4. return.

When the detection section B first outputs the human body detection signal, the control section 4 controls the load 6 through the load output control device 5.
Is started, and the operation is stopped a predetermined time after the input of the human body detection signal from any of the detection units A and B is lost. This fixed time is set shorter than the conventional time.

In this embodiment configured as described above,
For example, when the detection areas Xa and Xb are dispersed as shown in FIGS. 4A and 4B and the place is a space such as a private room (such as a toilet), if a door or the like is provided near the detection area Xb, Is supposed to be in the detection area Xb → Xa → Xb. Therefore, if the output of the human body detection signal of the detection unit B corresponding to the detection area Xa is followed by the output of the human body detection signal of the detection unit B, the detection is performed. There is no problem by returning the threshold value of the section A to Va1. In addition, by limiting the period set by the threshold value Va2 on the low output side of the detection unit A, the possibility of erroneous input can be reduced. (Embodiment 1-2) In the embodiment 1-1, the detection unit A
If the detection unit B outputs a human body detection signal during operation with the low output side threshold Va2, the threshold is returned to the high output side Va1, but in the present embodiment, the threshold of the detection unit A is first set. Is changed to Va2, the control unit 4 operates the timer of the detection unit A, and the timer is set to a predetermined time (about 5 to 10).
When the counting of (seconds) is completed, at that time, if there is no human body detection signal of the detecting unit B, the threshold of the detecting unit A is switched to Va1, and if there is, the threshold of the detecting unit A is maintained at Va2 and the timer is further counted. And restart the above operation.
On the other hand, when the human body detection signal is output from the detection unit A during the counting of the timer for a certain period of time, the timer count is reset at that point and the timer count is restarted from that point.

For example, as shown in FIG. 6A, the level of the infrared detection signal of the infrared detection element 1B exceeds the threshold value Vb, and the detection section B outputs a human body detection signal as shown in FIG. 6B. Then, the control unit 4 detects the detection unit A shown in FIG.
Is set from Va1 to Va2 and the detection unit A
The timer is operated as shown in FIG. Then, the detection unit A does not output the human body detection signal until the predetermined time is counted, and after the predetermined time has elapsed, the control unit 4 checks the presence or absence of the human body detection signal from the detection unit B at that time, and if there is an output, The counting of the timer of the detection unit A is started again. If there is no human body detection signal from the detector B, the threshold of the detector A is switched from Va2 to Va1.

On the other hand, when a human body detection signal is output from the detection unit A as shown in FIG. 4D during the counting of the timer, the counting of the timer is restarted.

Since the configuration of the present embodiment is the same as that of the embodiment 1-1, illustration is omitted here. The other operations are the same as those in the embodiment 1-1, and the description thereof is omitted.

In the present embodiment configured as described above, for example, when the detection areas Xa and Xb overlap as shown in FIG. 3, a human body detection signal not output from the detection unit B is output for a limited time. Since the detection unit A detects the human body by comparing the threshold value Va1 with the level of the infrared detection signal, it is possible to detect the stationary motion of the human body, and the probability of erroneous detection is considerably reduced. (Embodiment 1-3) In the embodiment 1-1, the detection unit A
Is set to return to Va1 on the high output side when there is an output of the human body detection signal of the detection unit B during operation at the threshold value Va2 on the low output side. However, in this embodiment, the human body detection signal is output. And a timer that counts a certain time in a retriggerable manner is provided in each of the detection units A and B, and the threshold of the detection unit A is switched to Va2 by the output of the human body detection signal from the detection unit B. In both cases, when the human body detection signal disappears, the threshold of the detection unit A is returned to Va1.

For example, as shown in FIG. 7A, the level of the infrared detection signal of the infrared detecting element 1B exceeds the threshold value Vb, and a human body detection signal is output from the detection unit B as shown in FIG. Then, the control unit 4 sets the threshold value of the detection unit A from Va1 to Va2 as shown in FIG. 3D, and starts the counting by operating the timer of the detection unit B as shown in FIG. I do. When the human body detection signal is output from the detection unit B before the counting of the fixed time is completed, the timer is restarted at that time.

On the other hand, when the level of the infrared detection signal in the detection section A exceeds the threshold value Va2 and the detection section A outputs a human body detection signal as shown in FIG. Is operated to count a certain time as shown in FIG. If a human body detection signal is output from the detection unit A before the timer counts a certain time,
The timer count is restarted.

Now, even if the human body detection signal of the detection unit A is not output thereafter, the timer of the detection unit B has finished counting for a certain time even if the timer has finished counting for a certain time and the counting operation is stopped. If not, the threshold of the detection unit A is set to V
a2 is maintained. Then, if the human body detection signal is output from the detection unit B again before the timer counts for a certain period of time, the timer restarts counting. If there is no human body detection signal from the detection unit B and a predetermined time has elapsed, the threshold value of the detection unit A is switched from Va2 to Va1.

On the other hand, when the detection section A outputs the human body detection signal during the counting of the timer, the counting of the timer is restarted.

Since the configuration of the present embodiment is the same as that of the embodiment 1-1, illustration is omitted here. The other operations are the same as those in the embodiment 1-1, and the description thereof is omitted.

In the present embodiment configured as described above, for example, when the detection areas Xa and Xb are dispersed and continuous as shown in FIG. Operation) When the detection units A and B corresponding to all the detection areas Xa and Xb stop outputting the human body detection signal, the threshold value of the detection unit A can be returned to the original value.

By performing the processing of the above-described embodiments 1-1 to 1-3, the detection unit A is not always set to the low output side threshold Va2, and the low output is always output only when a person is present. Since the threshold value Va2 on the side is set, there is no possibility of erroneous input, and a low output human body detection signal can be detected. Therefore, a high-precision infrared human body detection device and a load control device using the same. Can be provided. (Embodiment 2-1) In the above embodiments 1-1 to 1-3, the detection unit A is constantly driven.
The operation of the detection unit A is started under the control of the control unit 4 from the time when the detection unit B outputs the human body detection signal, and when the operation is started, the threshold value of the detection unit A is set to the low output side threshold value. V2a (the threshold V
b> voltage value of threshold V2a). When the detection unit B outputs the human body detection signal again, the detection unit A is stopped under the control of the control unit 4. Note that the configuration of the present embodiment is basically the same as that of the embodiment 1-1, and is not illustrated here.

As shown in FIG. 8 (a), the detection section B receives an infrared detection signal of the infrared detection element 1B having a level exceeding the threshold Vb on the + side and receives the detection signal as shown in FIG. 8 (b). When B outputs the human body detection signal, the control unit 4 operates the detection unit A as shown in FIG. The operation of the detection unit A is maintained again until the detection unit B receives an infrared detection signal of the infrared detection element 1B having a level exceeding the + side threshold Vb and outputs the human body detection signal. The threshold value of the detection unit A that has started operation is set to the threshold value Va2 on the low output side. When an infrared detection signal of the infrared detection element 1A having a level exceeding the threshold value Va2 is input to the detection unit A during operation, FIG. And outputs the human body detection signal. When the detection unit B again receives the infrared detection signal of the infrared detection element 1B having a level exceeding the + side threshold Vb and outputs the human body detection signal, the control unit 4 stops the operation of the detection unit A.

The other operation is the same as that of the embodiment 1-1, and the explanation is omitted. (Embodiment 2-2) In the embodiment 2-1 described above, the detection unit B
Outputs the human body detection signal, the detection unit A is stopped. However, the present embodiment is characterized in that the detection unit A stops when the detection unit A does not input the infrared detection signal of the human body detection for a certain period of time.

That is, as shown in FIG.
When the infrared detection signal of the infrared detection element 1B at a level exceeding the + side threshold Vb is input and the detection unit B outputs a human body detection signal as shown in FIG. At the time of rising, the detection unit A is operated as shown in FIG. At the same time, the timer of the detection unit A starts operating, and starts counting for a certain period of time as shown in FIG.

The threshold value of the detection unit A which has started operation is set to the threshold value Va2 on the low output side. During the operation before the end of the counting of the predetermined time, the detection unit A detects the infrared ray of the infrared detection element 1A whose level exceeds the threshold value Va2. When the detection signal is input, a human body detection signal is output as shown in FIG. 4D, and the timer is restarted when the human body detection signal is output.

If the infrared detection signal of the infrared detection element 1A at a level exceeding the threshold value Va2 is not input to the detection unit A during the counting by the timer and the human body detection signal is not output, the detection unit A is stopped at the end of the counting for a predetermined time. Stops operation.

The other operations are the same as those in the embodiment 1-1, and the description is omitted. (Embodiment 2-3) In the embodiment 2-1, the detection unit A stops the detection unit A when the detection unit B outputs the human body detection signal. In the present embodiment, the detection unit A and the detection unit B detect the human body respectively. When the signal is no longer output, the operation of the detection unit A is stopped. The configuration of this embodiment is the same as that of the first embodiment.
Since it is the same as -1, it is not shown here.

Then, as shown in FIG.
When the infrared detection signal of the infrared detection element 1B at a level exceeding the + side threshold Vb is input and the detection unit B outputs a human body detection signal as shown in FIG. At the time of rising, the detection unit A is operated as shown in FIG. At the same time, the timer of the detection unit B is operated as shown in FIG. This counting is restarted when a human body detection signal is output from the detecting unit B before the counting for a certain period of time is completed.

On the other hand, in the detecting section A which has started the operation, the threshold value is set to the low output side threshold value Va2, and the infrared detecting element 1A having a level exceeding the threshold value Va2 in the detecting section A during the operation.
When the infrared detection signal is input, a human body detection signal is output as shown in FIG. At the same time, the timer of the detection unit A is operated as shown in FIG.
This timer is also restarted when a human body detection signal is output from the detection unit A before the counting for a certain period of time is completed.

Then, when the detection units A and B stop outputting the human body detection signal and the timer of one of the detection units A or B has finally finished counting for a certain period of time,
The operation of the detection unit A is stopped. That is, when both the detection units A and B stop outputting the human body detection signal, the operation of the detection unit A is stopped. In FIG. 10, no human body detection signal is output from either of the detection units A and B until the timer of the detection unit B counts a certain time after the detection unit B outputs the human body detection signal, and the detection is performed. This shows a state in which the operation of the detection unit A is stopped when the timer of the detection unit B finishes counting for a predetermined time after the unit B outputs the last human body detection signal.

The other operation is the same as that of the embodiment 1-1, and the description is omitted.

In the above embodiments 2-1 to 2-3, by limiting the period of operation at the threshold value Va2 set on the low output side of the detection section A, control with less erroneous detection is possible. Particularly in a limited space, in a part where a human body is always detected from the detection area Xb, the detection unit A is operated only when a person is always in the corresponding detection area Xa, thereby reducing erroneous detection. Control can be performed. (Embodiment 3-1) Although the present embodiment uses the same configuration as that of Embodiment 1-1, the detector A. B is configured by the circuit shown in FIG.

In the illustrated circuit, the output of the infrared detecting element 1 composed of a pyroelectric element is amplified by an amplifier 2 composed of operational amplifiers OP1 and OP2 and an offset voltage Vof.
The amplified infrared detection signal is transmitted to two comparators CM.
In P1 and CMP2, comparison is made with reference voltages VTH1 and VTH2. These comparators CPM
1 and CPM2 constitute a comparison unit 3, and a reference voltage VTH
1, VTH2 is the threshold ± Vb or ± Va (of course, the threshold V
b> threshold Va).

Here, the center frequency of the amplifier 2 is determined by designing the constants of the impedance elements Zf1, Zs1, Zf2, Zs2. Zs is a capacitor Cs and a resistor Rs
Zf is composed of a capacitor Cf and a resistor Rf
Of parallel circuits.

Here, the center frequency fb of the amplification section 2B of the detection section B corresponding to movement is set to about 1 Hz from a known infrared detection element.

In response to this, for example, the constant of each impedance element Zf1, Zs1, Zf2, Zs2 is set as Rf1 =
Rf2 = 1.0 MΩ, Cfl = Cf2 = 0.1 μF, R
When s1 = Rs2 = 10 kΩ and Cs1 = Cs2 = 22 μF, the center frequency fb can be set to 1.07 Hz.

Further, the center frequency fa of the stationary detection unit A is
Is a frequency range lower than the above fb, and 0.3 to 0.6H
z.

In response, for example, Rf1 = Rf2 =
2.0 MΩ, Cf1 = Cf2 = 0.22 μF, Rs1:
If Rs2 = 10 kΩ and Cs1 = Cs2 = 22 μF, the center frequency fa can be set to 0.51 Hz.

FIG. 12 shows an example of setting the center frequencies fa and fb.

In this embodiment, as shown in FIG. 13A, the level of the infrared detection signal of the infrared detecting element 1B of the detecting section B exceeds the threshold value Vb on the + side of the detecting section B, and FIG. When the human body detection signal is output from the detection unit B as shown in FIG. 3, the control unit 4 operates the detection unit A as shown in FIG.
The level of the infrared detection signal of the infrared detection element 1B of the detection unit B again exceeds the threshold Vb on the + side of the detection unit B, and FIG.
When the human body detection signal is output from the detection unit B as shown in (2), the operation of the detection unit A is stopped. FIG. 13D shows a state in which a human body detection signal is output from the detection unit A when the level of the infrared detection signal of the infrared detection element 1A exceeds the threshold value Va of the detection unit A. (Embodiment 3-2) In the embodiment 3-1 described above, the detection unit B
Outputs the human body detection signal, the operation of the detection unit A is stopped. However, in the present embodiment, the detection unit A is stopped when the infrared detection signal of the human body detection is not input for a certain period of time. .

That is, as shown in FIG.
When the level of the infrared detection signal of the infrared detection element 1B exceeds the threshold value Vb of the detection unit B and the human body detection signal is output from the detection unit B as shown in FIG. The detection unit A is operated as shown in c). The detection unit A operates the timer at the same time as the operation starts, as shown in FIG.

Before the end of the counting for the predetermined time,
When the level of the infrared detection signal of the infrared detection element 1A exceeds the threshold value Va of the detection section A and the detection section A outputs a human body detection signal as shown in FIG. Is recounted. When the timer finishes counting for a certain period of time, the detection unit A stops operating at that point.

Other operations are the same as those of the embodiment 3-1. (Embodiment 3-3) In the embodiment 3-1, the detection unit A stops the detection unit A when the detection unit B outputs the human body detection signal. However, in the embodiment, the detection unit A and the detection unit B detect the human body. When the output of the signal is stopped, the operation of the detection unit A is stopped.

That is, as shown in FIG. 15A, in the detecting section B, the infrared detecting element 1 having a level exceeding the threshold value Vb is used.
When the infrared detection signal of B is input and the detection unit B outputs a human body detection signal as shown in FIG. 4B, the control unit 4 shows the detection unit A in FIG. 4D when the human body detection signal rises. Work as follows. At the same time, the timer of the detection unit B is operated to start counting for a predetermined time as shown in FIG. This counting is restarted when a human body detection signal is output from the detecting unit B before the counting for a certain period of time is completed.

On the other hand, in the detecting section A which has started the operation, the threshold V
When an infrared detection signal of the infrared detection element 1A having a level exceeding a is input, a human body detection signal is output as shown in FIG. At the same time, the timer of the detection unit A is operated as shown in FIG. This timer is also restarted when the detection section B outputs a human body detection signal before the end of the counting for a predetermined time.

Then, when the control unit 4 stops outputting the human body detection signals of the detection units A and B and the timer of one of the detection units A or B finally counts for a predetermined time,
The operation of the detection unit A is stopped. That is, when both the detection units A and B stop outputting the human body detection signal, the operation of the detection unit A is stopped. In FIG. 15, no human body detection signal is output from either of the detection units A and B until the timer of the detection unit B counts a predetermined time after the detection unit B outputs the human body detection signal. This shows a state in which the operation of the detection unit A is stopped at a point in time when a predetermined time has elapsed since the unit B outputs the last human body detection signal.

Other operations are the same as those of the embodiment 3-1.

The above-mentioned embodiments 3-1 to 3-3 are the same as the embodiments 1-1 to 1-3 and 2-1 to 2-3, but the period during which the stationary detection unit A operates is limited. By doing so, control with less erroneous detection can be performed. (Embodiment 4) In the above embodiments 3-1 to 3-3, the value of the center frequency fa set by the amplification unit 2A of the detection unit A is one value. As shown in (1), there is a characteristic in that an amplifier 2A1 having a center frequency of fa1 and an amplifier 2A2 having a center frequency of fa2 are provided. Instead of providing two amplifying sections, as shown in FIG. 17, an impedance element Zf connected to the operational amplifier OP constituting the amplifying section 2A
2, Zf2 ′ may be switched by a switch SW operated by a control signal of the control unit 4 to switch the center frequency between fa1 and fa2.

Here, the intermediate frequency fa2 is assumed to be equal to the intermediate frequency of the amplifier 2B of the detector B (that is, used as a detector corresponding to movement), and the center frequency fa1 is set in a low frequency range (as a detector corresponding to stationary). Use) (f
a1 <fa2).

The detection section A of the present embodiment is usually
Although it operates at the center frequency fa2, as shown in FIG. 18A, the level of the infrared detecting element 1B exceeds the threshold Vb on the + side of the detecting section B, and the human body detection signal from the detecting section B is changed as shown in FIG.
When outputting as shown in (b), the control unit 4 switches the center frequency of the amplification unit 2A of the detection unit A to fa1. Also fa
When the detection unit A is operating at the center frequency of 1 and the level of the infrared detection element 1B again exceeds the + threshold value Vb of the detection unit B and the detection unit B outputs a human body detection signal, the control unit 4 The center frequency of the amplification unit 2A of the detection unit A is switched to fa2. The trigger for switching from the center frequency fal to fa2 may be a case where the human body detection signal is not output from the detection unit A for a certain period of time, or the human body detection signal is not output from both the detection unit A and the detection unit B. This may be the case.

FIG. 18C shows an infrared detection signal of the infrared detection element 1A of the detection section A, and FIG. 18D shows a human body detection signal output from the detection section A.

The present embodiment configured as described above is the same as the embodiments 3-1 to 3-3, except that control is performed with less erroneous detection by limiting the period during which the stationary detection unit A operates. Can be provided. In addition, by setting the intermediate frequency to fa2, it is possible to normally operate as a detection unit for movement, so that the detection area can be widely used. Embodiment 5 Embodiments 1-1 to 1-3 and 2-1
, The threshold value Va2 on the low output side in the detection unit A
Can be set according to the embodiments 3-1 to 3-3.
In this embodiment, the center frequency of the amplification unit 2A of the detection unit A can be set to a low frequency band. However, in this embodiment, if the detection unit B outputs a human body detection signal, the detection unit A operates. It is characterized in that the threshold value at that time is set to Va2 on the low output side (voltage value of threshold value Vb> voltage value of threshold value Va2). The determination of the stop of the operation of the detection unit A is made as shown in FIG.
3) or FIG. 20 (same as FIG. 14) or FIG.
(Same as FIG. 15). Since the operations shown in FIGS. 19 to 21 are the same as those in FIGS. 13 to 15, the description will be omitted here with reference to the description of the embodiments 3-1 to 3-3.

When a human body detection signal is output from the detection section B, which triggers the start of the operation of the detection section A, the center frequency of the amplification section 2A of the detection section A is changed to fa2 under the control of the control section 4.
To fa1.

The center frequencies fa1 to f1 of the detection section A are
The configuration for switching to a2 is the same as in the fourth embodiment.

In the present embodiment configured as described above, the threshold of the detection unit A is set to Va2 on the low output side, and the center frequency is switched to fa2 to limit the period during which the detection unit A operates as a stationary detection unit. Thus, control with less erroneous detection can be provided. (Embodiment 6) In the above embodiments 1-1 to 1-3, the detection unit A and the detection unit B are connected by wire via the control unit 4, but in the present embodiment, as shown in FIG. It is assumed that the detection unit A and the detection unit B are transmitting information wirelessly. That is, the detection unit A and the detection unit B are connected to the control unit 4A and the control unit 4B, respectively, which process the human body detection signal, and the control unit 4 connects the human body detection signal processed by the control unit 4B to the load output control device 5. Transmitting unit 7 and receiving unit 8 to unit 4A
And can be transferred wirelessly. When the load output control device 5 is connected to the control unit 4B side, the control is changed from the signal control units 4A to 4B. In the figure, reference numeral 9 denotes a power supply unit.

In this embodiment, when the detection unit B outputs a human body detection signal to the control unit 4B, the detection information is transmitted from the transmission unit 7 to the reception unit 8. The control unit 4A that has received the detection information performs an operation of changing the threshold value of the detection unit A from Va1 to Va2 when receiving the signal. Other controls are the same as those in the embodiment 1-1, 1-2, or 1-3, and thus description thereof is omitted.

The control unit 4A that has received the detection information from the detection unit B may operate the detection unit A. In this case, as other control, the embodiment 2-1 to the embodiment 2-1
Any one of 2-3, 3-1 to 3-3, and 4, 5 is adopted.

In the present embodiment configured as described above, since the detection information of the detection unit B is transmitted to the detection unit A by radio, if the detection areas Xa and Xb are dispersed as shown in FIG. There is an advantage that it is more convenient than. In the case of wireless communication, it is easy to change the detection area when it is desired to change the detection area. (Embodiment 7-1) In the present embodiment, as shown in FIG. 23, an illuminance sensor 10 is added to the configuration of Embodiment 1-1. This illuminance sensor 10 may be CdS or a photodiode.

That is, in the present embodiment, the illuminance around the installation location is detected by the illuminance sensor 10, and the relationship with the preset lighting start set value is determined as follows: ambient illuminance value lxa> lighting start set value lxb (hereinafter, the periphery is bright). Control unit 4)
Does not perform lighting control of the load 6 such as a lamp load, and if the ambient illuminance value lxa <the lighting start set value lxc (hereinafter, the surroundings are dark), the load 6 through the load output control device 5
Is enabled.

Further, as shown in FIG. 24B, the level of the infrared detection signal of the infrared detecting element 1B exceeds the threshold value Vb, and a human body detection signal is output from the detection section B as shown in FIG. If the surroundings are bright as shown in FIG. 5A, the threshold value of the detecting unit A shown in FIG. 5D is kept at Va1, and the detecting unit B outputs the human body detection signal and the surroundings are If it is dark, the threshold of the detection unit A is set to Va1.
From Va2 to Va2. In the case of FIG. 24, since the surroundings are bright, the threshold value remains at Va1, so that the level of the infrared detection signal of the detection unit A does not exceed the threshold value Va2 as shown in FIG. No human body detection signal is output from the detection unit A as shown in FIG.

Further, if the detection unit B outputs a human body detection signal and the surroundings are bright, the amplification unit 2 of the detection unit A
The center frequency of A is changed from fa2 to fa1 when the center frequency of A is kept at fa2 and the human body detection signal is output from the detection unit B and the surroundings are dark.

(Embodiment 7-2) Embodiments 2-1 to 2-
3, 3-1 to 3-3, the configuration of the above-described embodiment 7-1 is adopted. In the present embodiment, if a human body detection signal is not output from the detection unit B and the surroundings are bright,
If the detection unit A is kept stopped, the detection unit B outputs a human body detection signal, and the surroundings are dark,
The feature is that the detection unit A is operated with the threshold set to Va1.

That is, as shown in FIG. 25 (b), the level of the infrared detection signal of the infrared detection element 1B exceeds the threshold value Vb, and the human body detection signal is output from the detection section B as shown in FIG. 24 (c). If the surroundings are bright as shown in FIG. 24A, the detection unit A is kept stopped as shown in FIG. Therefore, the human body detection signal is not output from the detection unit A as shown in FIG.

Embodiment 7-1 configured as described above,
In 7-2, by using the illuminance sensor 10, it is possible to further limit a period during which the threshold Va2 on the low output side of the detection unit A is set, that is, a period during which the stationary correspondence detection unit operates. For example, this is an effective means for controlling a load 6 such as a lamp load.

[0100]

According to the first aspect of the present invention, infrared light from the corresponding detection area is separately provided corresponding to the first and second detection areas, and an output corresponding to a change in the amount of received light is received. A first and a second infrared detecting element for outputting a level infrared detecting signal, a first and a second amplifying section for separately amplifying a detecting signal output from the infrared detecting element, and a corresponding to these amplifying sections. And a first and a second comparing section having a first and a second comparing section for comparing a detection signal output from the corresponding amplifying section with a predetermined threshold value. An infrared detection device that outputs a human body detection signal when a level of an infrared detection signal output from a corresponding infrared detection element exceeds a threshold value, wherein when the second detection unit detects a human body, the first detection unit Since the threshold is set lower than the threshold of the second detection unit, Can be detected by the operation of the first detection unit set to the threshold on the low output level even in the state where the movement is small, and the threshold on the low output level only in the detection area where the person is stationary or where there is little movement, or Since the stationary correspondence detection unit is provided and the threshold value on the low output level side is not always set, there is an effect that erroneous detection is not reduced and reliability of human body detection can be improved. .

According to a second aspect of the present invention, in the first aspect of the present invention, the first detecting section has at least two threshold values having a magnitude relationship with each other, and before the second detecting section detects a human body, The infrared detecting device according to claim 1, wherein the determination is made using the larger first threshold, and after the second detector detects the human body, the determination is made using the smaller second threshold. Can be realized.

A third aspect of the present invention is the invention according to the second aspect, wherein the second detector outputs a human body detection signal when the first detector is operating with the second threshold set. ,
By changing the threshold value set by the first detection unit from the second threshold value to the first threshold value, it is possible to realize an infrared detection device that can obtain the effect of the second aspect of the invention.

According to a fourth aspect of the present invention, in the second aspect of the present invention, when the first detector is operating with the second threshold set, the first detector no longer outputs a human body detection signal. Then, after a certain period of time has elapsed, the threshold value of the first detection unit is changed from the second threshold value to the first threshold value, thereby realizing the infrared detection device that can achieve the effect of the second aspect of the invention.

According to a fifth aspect of the present invention, in the second aspect of the present invention, when the first detector is operating with the second threshold set, the first detector and the second detector are both operated. In both cases, when the human body detection signal is no longer output, by changing the threshold value of the first detection unit from the second threshold value to the first threshold value, it is possible to realize an infrared detection device that can obtain the effect of the second aspect of the invention.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the center frequency of the frequency-gain characteristics of the first and second amplifying sections is set to be equal to the center frequency of the first amplifying section. Since the first detection unit is set to be a stationary correspondence detection unit and the second detection unit is set to be a movement correspondence detection unit by setting so as to be on the lower frequency side than the center frequency, even if there is little movement of the human body, it is possible to support stationary. Since the first detection unit can detect the operation, and the stationary corresponding detection unit is provided only in the detection area where the person is stationary or where there is little movement, the stationary corresponding detection unit does not always operate. Thus, an effect is obtained that erroneous detection is not performed and the reliability of human body detection can be improved.

According to a seventh aspect of the present invention, in the first or the sixth aspect of the present invention, the first detection section is driven from the time when the second detection section outputs a human body detection signal. Since the unit does not operate, it is possible to realize an infrared detection device with less erroneous detection.

According to an eighth aspect of the present invention, in the first or the sixth aspect of the present invention, if the first detection section is operating and a human body detection signal is output from the second detection section, the first detection section can be used. By stopping the operation of (1), an infrared detection device with less erroneous detection can be realized.

According to a ninth aspect of the present invention, in the first or sixth aspect of the present invention, the operation of the first detector is stopped after a lapse of a predetermined time since the first detector no longer outputs the human body detection signal. This makes it possible to realize an infrared detection device with less erroneous detection.

According to a tenth aspect of the present invention, in the first or the sixth aspect of the present invention, the operation of the first detector is stopped when the first and second detectors no longer output a human body detection signal. By doing so, it is possible to realize an infrared detection device with less erroneous detection.

According to an eleventh aspect of the present invention, in the sixth aspect, the amplification section of the first detection section has at least two center frequencies having a magnitude relationship with each other, and the second detection section detects a human body. Before the operation, the apparatus operates at the lower first center frequency, and operates at the higher second center frequency after the second detector detects a human body. Can be realized.

A twelfth aspect of the present invention is the invention according to the eleventh aspect, wherein the second detector outputs a human body detection signal when the amplifier of the first detector operates at the first center frequency. By changing from the first center frequency to the second center frequency, the invention of claim 13 is the invention of claim 11, wherein the amplifier of the first detector operates at the first center frequency. In a state in which the first center frequency does not output the human body detection signal, the first center frequency is changed from the first center frequency to the second center frequency in a state where the human body detection signal is not output.
The invention of claim 11, in the invention of claim 11, wherein the amplifier of the first detector is operating at the first center frequency,
An infrared detecting device that can obtain the effect of the invention of claim 11 by changing the first center frequency to the second center frequency when the human body detection signal is no longer output from the detecting unit and the second detecting unit. Can be realized.

According to a fifteenth aspect of the present invention, in the first or sixth aspect of the present invention, the first detector operates at a low output side threshold and a low frequency side center frequency.
An infrared detecting device that can obtain the effect described above can be realized.

According to a sixteenth aspect of the present invention, in the first aspect of the present invention, the first detection ridge area and the second detection area are used for detecting a human body in an overlapping space. It is possible to realize an infrared detecting device that can obtain the effect.

According to a seventeenth aspect of the present invention, in the first aspect of the present invention, when performing the human body detection in a space where the first detection ridge area and the second detection area do not overlap with each other, It is possible to realize an infrared detecting device that can obtain the effect.

According to an eighteenth aspect of the present invention, there is provided the infrared detecting device according to any one of the first to seventeenth aspects, wherein an output to a load is output in accordance with a human body detection signal output from the first and second detection units. A control unit that outputs a control signal to be adjusted is provided, and the load output is controlled by the control signal from the control unit. Therefore, even when there is little movement of the human body, it is detected by the threshold on the low output level side and the operation of the stationary correspondence detection unit. With the infrared detection device that can determine that, for example, while a person is in the detection area, there is no possibility that the operation of the load stops, load control due to erroneous detection is also eliminated, and only one threshold value is used as in the past. Since it is possible to set the extension time to be short at the time of the judgment, there is an effect that the load does not continuously operate unnecessarily.

According to a nineteenth aspect of the present invention, in the invention of the eighteenth aspect, since the load is a lamp load, for example, there is no possibility that the lamp load is turned off while the loader is in the detection area. Since it is possible to set a short extension time when a judgment is made using only one threshold value as in the related art, there is an effect that the lamp load is not wastefully turned on.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of Embodiment 1-1 of the present invention.

FIG. 2 is an explanatory diagram of an infrared detection signal of an infrared detection element used in the embodiment.

FIG. 3 is an explanatory diagram of an example of a detection area used in the embodiment.

FIG. 4 is an explanatory diagram of another example of the detection area used in the above.

FIG. 5 is a timing chart for explaining the above operation.

FIG. 6 is a timing chart for explaining the operation of the embodiment 1-2 of the present invention.

FIG. 7 is a timing chart for explaining the operation of the embodiment 1-3 of the present invention.

FIG. 8 is a timing chart for explaining the operation of the embodiment 2-1 of the present invention.

FIG. 9 is a timing chart for explaining the operation of the embodiment 2-2 of the present invention.

FIG. 10 is a timing chart for explaining the operation of the embodiment 2-3 of the present invention.

FIG. 11 is a circuit diagram of an amplification unit used in Embodiment 3-1 of the present invention.

FIG. 12 is an explanatory diagram of setting an intermediate frequency of the amplifier in the above.

FIG. 13 is a timing chart for explaining the above operation.

FIG. 14 is a timing chart for explaining the operation of the embodiment 3-2 of the present invention.

FIG. 15 is a timing chart for explaining the operation of the embodiment 3-3 of the present invention.

FIG. 16 is a configuration diagram of a fourth embodiment of the present invention.

FIG. 17 is a configuration diagram of a main part of another example of the amplification unit used in the embodiment.

FIG. 18 is a timing chart for explaining the above operation.

FIG. 19 is a timing chart for explaining the operation of the fifth embodiment of the present invention.

FIG. 20 is a timing chart for explaining another operation of the above.

FIG. 21 is a timing chart for explaining another operation of the above.

FIG. 22 is a configuration diagram according to a sixth embodiment of the present invention.

FIG. 23 is a configuration diagram of Embodiment 7-1 of the present invention.

FIG. 24 is a timing chart for explaining the above operation.

FIG. 25 is a timing chart for explaining the operation of the embodiment 7-2 of the present invention;

FIG. 26 is a timing chart for explaining the operation of the conventional example.

FIG. 27 is a timing chart for explaining operation of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1A, 1B Infrared detecting element 2A, 2B Amplifying part 3A, 3B Comparing part 4 Control part 5 Load output control device 6 Load A, B detecting part

Claims (19)

[Claims] An infrared detection signal is provided separately for each of the first and second detection areas, receives infrared light from the corresponding detection area, and outputs an infrared detection signal having an output level corresponding to a change in the amount of received light. First and second infrared detecting elements, first and second amplifying sections for individually amplifying detection signals output from these infrared detecting elements, and corresponding amplifying sections provided corresponding to these amplifying sections. And a first and a second detection unit having a first and a second comparison unit for comparing a detection signal output from the first detection unit with a predetermined threshold value. An infrared detection device for outputting a human body detection signal when a level of an infrared detection signal to be output exceeds a threshold value, wherein a threshold value of the first detection unit is set to a second detection value when the second detection unit detects a human body. Infrared detection characterized by being lower than the threshold of the part Location. 2. The method according to claim 1, wherein the first detection unit has at least two threshold values having a magnitude relationship with each other, and before the second detection unit detects a human body, the first detection unit makes a determination using the larger first threshold value. The infrared detecting apparatus according to claim 1, wherein after the second detecting unit detects a human body, the determination is performed using the smaller second threshold value. 3. When the second detector outputs a human body detection signal while the first detector is operating with the second threshold set, the threshold set by the first detector is changed. The infrared detection device according to claim 2, wherein the second threshold is changed to the first threshold. 4. The method according to claim 1, wherein when the first detecting section is operating with the second threshold set, the first detecting section stops outputting the human body detection signal, and after a lapse of a predetermined time, the first detecting section detects the human body detecting signal. 3. The infrared detecting apparatus according to claim 2, wherein the threshold of the section is changed from the second threshold to the first threshold. 5. When the first detector and the second detector no longer output a human body detection signal while the first detector is operating with the second threshold set, the first detector is activated. 3. The infrared detecting apparatus according to claim 2, wherein the threshold value of the detecting unit is changed from the second threshold value to the first threshold value. 6. The center frequency of the frequency-gain characteristics of the first and second amplifiers is set such that the center frequency of the first amplifier is lower than the center frequency of the second amplifier. The infrared detecting apparatus according to claim 1, wherein the first detecting unit is a stationary correspondence detecting unit, and the second detecting unit is a moving correspondence detecting unit. 7. The infrared detecting apparatus according to claim 1, wherein the first detecting section is driven when the second detecting section outputs a human body detection signal. 8. When the first detection section is operating, the second detection section is activated.
7. The infrared detection device according to claim 1, wherein the operation of the first detection unit is stopped when a human body detection signal is output from the detection unit. 9. The infrared detecting apparatus according to claim 1, wherein the operation of the first detecting section is stopped after a lapse of a predetermined time since the first detecting section stops outputting the human body detection signal. . 10. The infrared ray according to claim 1, wherein the operation of the first detection section is stopped when the human body detection signal is not output from the first detection section and the second detection section. Detection device. 11. The amplifying section of the first detecting section has at least two center frequencies having a magnitude relationship with each other, and before the second detecting section detects a human body, the smaller first center frequency. 7. The infrared detecting apparatus according to claim 6, wherein the second detecting section operates at a larger second center frequency after the second detecting section detects a human body. 12. When the amplifier of the first detector operates at the first center frequency and the second detector outputs a human body detection signal, the second center frequency is shifted from the first center frequency to the second center frequency. The infrared detecting device according to claim 11, wherein the infrared detecting device is changed to: 13. A method according to claim 1, wherein the amplifying section of the first detecting section is operating at the first center frequency, and the first detecting section stops outputting the human body detection signal, and after a lapse of a predetermined time, the first detecting section outputs the first human body detecting signal. The infrared detecting apparatus according to claim 11, wherein the center frequency is changed to a second center frequency. 14. When the first detection unit and the second detection unit stop outputting a human body detection signal while the amplification unit of the first detection unit is operating at the first center frequency, The infrared detection device according to claim 11, wherein the center frequency is changed from the first center frequency to the second center frequency. 15. The infrared detector according to claim 1, wherein the first detector operates at a low output side threshold and a low frequency side center frequency. 16. The infrared detection device according to claim 1, wherein the first detection ridge area and the second detection area overlap. 17. The first detection ridge area and the second detection area,
The infrared detecting device according to claim 1, wherein the infrared detecting device does not overlap. 18. A control signal for adjusting output to a load according to a human body detection signal output from the first and second detection units, using the infrared detection device according to any one of claims 1 to 17. A load control device, comprising: a control unit for outputting the load; and controlling a load output by a control signal from the control unit. 19. The load control device according to claim 18, wherein said load is a lamp load.