JPH10213671A - Heat ray ultrasonic combined detection sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat ray ultrasonic combined detection sensor capable of reducing erroneous judgment. SOLUTION: This detection sensor has in the constitution the first sensor part 1 judging the presence of an object by the change of infrared in the first area A, the second sensor part 2 judging the presence of the object by the reflection wave pattern of ultrasonic transmitted in the second area B and a comprehensive judgment part 3 judging the presence of the object from the first sensor part and the second sensor part. In this case, provided are a pulse counter 4a counting the number of pulses output by the first sensor part when the first sensor part and the second sensor part detected the presence of the object and then the first sensor part detected the presence of the object and the second sensor part does not to detect the presence of the object, a comparing part 4b comparing the number of pulses and specific threshold value and a holding setter part 4c judging that an object is in the first area for a certain period when the number of pulses is smaller than the specific threshold value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a human body detection sensor, and more particularly, to a heat ray sensor for detecting movement of a human body by detecting a temperature difference between the human body and a background, and transmitting an ultrasonic wave to generate a reflected wave. The present invention relates to an ultrasonic sensor that detects an object or a human body by detecting the presence of the human body.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. FIG. 4 is a block diagram showing the configuration of the hot-wire ultrasonic composite detection sensor. FIG. 5 is a side view illustrating a first area and a second area. FIG. 6 is a side view illustrating a first area of the heat ray ultrasonic combined detection sensor. FIG. 7 is an explanatory diagram of the output signal of the first sensor. FIG. 8 is an explanatory diagram of the output signal of the first sensor. FIG. 9 is a time chart illustrating the output of the first sensor unit, the output of the second sensor unit, and the output of the combined hot-wire and ultrasonic detection sensor. 10 to 13 are side views for explaining a state where a human body enters a toilet and sits down.

[0003] In FIG. 4, the heat ray ultrasonic composite detection sensor includes a first sensor unit 1, a second sensor unit 2, and a comprehensive judgment unit 3.

The first sensor unit 1 is a hot-wire sensor that detects the amount of change in heat in the first area A to detect the presence of an object such as a human body D in the first area A. It is. Specifically, an output unit 1a that outputs a number of pulses according to the amount of change in heat in the first area A, a first determination unit 1b that determines that the human body D is present when the pulses are output, Is configured.

[0005] The first area A is a conical area having a size such that the human body D and the like can move to some extent as shown in FIG. 5 and includes a plurality of detection beams C as shown in FIG. Things.

The output unit 1a is composed of a pyroelectric element, an amplifying unit, and a comparator. The output unit 1a outputs more pulses as the infrared ray changes more steeply (ie, the moving amount of the object is larger). The pyroelectric element changes the voltage output each time the object D moving in the first area A crosses the detection beam C shown in FIG. The amplifier amplifies the change in the voltage and outputs output signals S1 and S2 as shown in FIG. The comparator compares the amplified voltage with a predetermined threshold voltage, and outputs a pulse as a comparator output signal S3, S4 when the voltage exceeds the threshold voltage. Therefore, if the object moves greatly and the infrared change is large within a certain period, the pulse S3 output from the output unit 11a is large. If the object does not move so much and the infrared change is small, the pulse S4 output from the output unit 1a is Less.

When the pulse output from the output unit 1a is on, the first determination unit 1b determines that an object is present in the first area, outputs a human body detection signal S5, and turns off the pulse. In this case, the human body detection signal S5 is not output. At this time, the human body detection signal S is immediately responded to the ON / OFF of the pulse.
Since the output of the human body detection signal S5 may fluctuate sharply when the output of the output unit 1a is turned on and off, the first determination unit 1b determines that the pulse output from the output unit 1a is on, as shown in FIG. Output signal S for a certain period after changing from
5 ′ is added, and a human body detection signal S5 is output.

The second sensor unit 2 is an ultrasonic sensor, which transmits an ultrasonic wave into the second area B, receives a reflected wave, and receives a reflected wave from the human body D in the second area B. It detects the presence of an object. The second area B is a cone-shaped area included in the first area A as shown in FIG. The second sensor unit 2 transmits and receives an ultrasonic wave to and from the second area B by using a transmitting and receiving unit 2a for receiving a reflected wave and a pattern of the ultrasonic wave received by the transmitting and receiving unit 2a. Wave part 2a
And a second determination unit 2b that determines the distance between the object and the object and determines the presence of the object in the second area B. When the second determining unit 2b detects the presence of the object, the human body detection signal S
6 is output.

The overall judgment section 3 has an OR section 3a and a sensing judgment holding section 3b. When the human body detection signal S5 or S6 is input from the first determination unit 1b of the first sensor unit 1 or the second determination unit 2a of the second sensor unit 2, the logical sum unit 3a performs the first It determines that an object exists in the area A, and outputs a human body presence signal S7 to the sensing determination holding unit 3b.

The sensing determination holding unit 3b receives the human body presence signal S7 from the OR unit 3a and outputs it as a human body presence signal S9 to the outside. S8 is generated, and the sensor holding signal S8 is output as a human body presence signal S9. The human body presence signal S output by the comprehensive judgment unit 3
Reference numeral 9 is used, for example, for controlling on / off of a device. Therefore, in the heat ray ultrasonic composite type detection sensor, if it is within the first area A, it is possible to detect the presence of an object performing movement or operation, and further, within the second area B. Also, it is possible to detect the presence of an object that has not moved or moved.

[0011] When this hot-wire / ultrasonic combined detection sensor is applied to, for example, human body detection in a toilet and installed so that the second area B including the toilet seat is located, the human body D entering the toilet will be in the second position. A human body D sitting on the toilet seat and not moving can be detected by the second sensor unit 2, and a human body D going out of the toilet can be detected by the first sensor unit 1. can do. Therefore, if on / off of the lighting equipment is controlled based on the human body presence signal S9 output from the heat ray ultrasonic composite detection sensor, the lighting is turned on when the human body D enters the toilet, and the delay occurs when the human body D leaves the toilet. The lighting is turned off after a lapse of time T.

[0012]

However, the hot-wire / ultrasonic combined-type detection sensors shown in FIGS. 4 to 13 have the following problems.

That is, the posture of the human body D, which is a reflection object of the ultrasonic wave, the material shape of the clothes, etc. are various, and the reflectivity of the ultrasonic wave is reduced depending on the posture and the material of the clothes, and the second area There is a case where the second sensor unit 2 cannot detect the human body D even though the human body D exists in B. In this case, if the human body D is not moving, the human body D cannot be detected by the first sensor unit 1, so that after the delay time T from the second sensor unit 2 cannot detect the human body D, the comprehensive judgment unit 3 does not output the human body presence signal S9.

This will be described in detail with reference to a time chart shown in FIG. First, at time t1, when the human body D enters the toilet from outside the toilet shown in FIG. 10 as shown in FIG. 11, the first sensor unit 1 detects the presence of the human body D. At this time, since the human body D has not yet entered the second area B, the second sensor unit 2 does not detect the human body D.

Next, as shown in FIG. 12, between the time t2 and the time t3, as the human body D moves near the toilet seat, the first sensor unit 1 detects the presence of the human body D and outputs a human body detection signal. While outputting S5, the second sensor unit 2 also detects the human body D and outputs a human body detection signal S6.

Then, between times t3 and t4,
As shown in FIG. 13, when the human body D sits on the toilet seat and stops moving, the first sensor unit 1 cannot detect the presence of the human body D, and only the second sensor unit 2 detects the human body D. .

Thereafter, from time t4 to time t6,
The posture may be changed while the human body D is sitting, and the second sensor unit 2 may not be able to detect the human body D even though the human body D is present in the second area B due to the change in the posture. is there. In FIG. 9, at time t5, the second sensor unit 2 cannot detect the human body D.

In this case, the first sensor unit 1 can detect the presence of the human body D while the human body D is operating. However, after the time t6 when the operation of changing the posture of the human body D is completed, the first sensor unit 1 is also activated. The human body D is no longer detected. Therefore, at time t7 after the elapse of the predetermined delay time T from time t6, despite the fact that the human body D actually exists in the toilet, the heat ray ultrasonic combined detection sensor outputs the output of the human body presence signal S9. No longer.

Thereafter, when the human body D operates again at time t8, the hot-wire / ultrasonic combined detection sensor outputs a human body presence signal. The same operation is performed after time t9.

Therefore, the conventional hot-wire ultrasonic composite detection sensor has a problem that the human body D may not be detected despite the presence of the human body D depending on the posture of the human body D. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to detect a human body by a second sensor unit when the human body exists in the second area. Even in the case where it is no longer possible, a hot-wire ultrasonic composite type detection sensor that does not judge that the human body does not exist, and thus can reduce erroneous judgment that it is judged that the human body does not exist despite the existence of the human body. To provide.

[0022]

According to the present invention, in order to solve the above-mentioned problem, according to the first aspect of the present invention, a number of pulses corresponding to the amount of change in heat in the first area are output. An output unit, and a first determination unit that determines that a human body is present when a pulse is output, a first sensor unit that detects the presence of an object in the first area, A transmitting and receiving unit that transmits ultrasonic waves to a second area smaller than the area of the first area and receives a reflected wave from an object existing in the second area; and a transmitting and receiving unit. And a second determining unit that determines the presence of an object in the second area based on the pattern of the ultrasonic wave received by the transmitting / receiving unit after being reflected from the object transmitted from the second area. A second sensor unit that detects the presence of the object, and the first determination unit detects the presence of the object During the period, or during a period during which the second determination unit detects the presence of the object, or during a predetermined period after the first determination unit and the second determination unit no longer detect the object, And a comprehensive judgment unit that outputs a human body presence signal by judging that there is an object, when the first sensor unit and the second sensor unit detect the presence of an object. Then, when the first sensor unit detects the object and the second sensor unit no longer detects the presence of the object, the first sensor unit stops detecting the presence of the object from the time when the second sensor unit no longer detects the presence of the object. A pulse number counting unit for counting the number of pulses output by the first sensor unit until the first sensor unit and the second sensor unit no longer detect the presence of an object; and a pulse number and a predetermined threshold. A comparison unit for comparing the pulse number with a predetermined threshold value; When the value is smaller than the value, a period from the time when the first sensor unit and the second sensor unit no longer detect the object to the time when the first sensor unit or the second sensor unit detects the object thereafter, And a holding setting unit that determines that an object is present in the first area and outputs a human body presence signal.

According to the second aspect of the present invention, an output unit for outputting a number of pulses corresponding to the amount of change in heat in the first area, and when the pulses are output, it is determined that a human body is present. A first sensor unit that detects the presence of an object in the first area, and a second sensor area smaller than the first area and included in the first area. A transmitting and receiving unit that transmits a sound wave and receives a reflected wave from an object existing in the second area, and a supersonic wave transmitted from the transmitting and receiving unit and reflected by the object and received by the transmitting and receiving unit. A second determination unit that determines the presence of an object in the second area by a sound wave pattern, and a second sensor unit that detects the presence of the object in the second area; and The period during which the judgment unit detects the presence of the object, or the period during which the second judgment unit detects the presence of the object Or, for a predetermined period after the first determination unit and the second determination unit no longer detect an object, a comprehensive determination unit that determines that an object is present in the first area and outputs a human body presence signal, In the ultrasonic composite detection sensor, the first sensor unit and the second sensor unit are detecting the presence of an object, then the first sensor unit is detecting the object, the second sensor When the first sensor unit and the second sensor unit no longer detect the presence of the object from the time when the second sensor unit no longer detects the presence of the object when the unit no longer detects the presence of the object. A pulse number counting unit that counts the number of pulses output by the first sensor unit, a comparing unit that compares the pulse number with a predetermined threshold, and the pulse number is higher than a predetermined threshold. When smaller, the first sensor unit and the second sensor Certain period from the time the sub unit no longer detects the object, is characterized in that it has a holding setting unit for outputting a human presence signal by determining that an object is present in the first area, the.

According to a third aspect of the present invention, the holding and setting unit has a predetermined length of time as a fixed period of time, wherein the hot-wire / ultrasonic hybrid type is provided. Detection sensor.

In the invention described in claim 4, the holding setting section sets the fixed period to be longer as the number of counted pulses is smaller, and to set the fixed period to be shorter as the number of counted pulses is larger. It is a feature. Is the way.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a combined heat and ultrasonic detecting sensor according to the present invention is based on FIGS. 1 and 2 and FIGS. 10 and 13, and a second embodiment is based on FIG. Will be explained.

[First Embodiment] FIG. 1 is a block diagram showing a configuration of a hot-wire ultrasonic composite detection sensor. FIG. 2 is a time chart illustrating the output of the first sensor unit, the output of the second sensor unit, and the output of the combined hot-wire and ultrasonic detection sensor. 10 to 13 are side views for explaining a state where a human body enters a toilet and sits down. FIG.
In, the same reference numerals are given to the same parts as those of the hot-wire / ultrasonic combined-type detection sensor described in the above-described conventional technique, and the detailed description of the same parts will be omitted.

The hot-wire / ultrasonic combined detection sensor according to the present embodiment shown in FIG. 1 is different from the hot-wire / ultrasonic combined detection sensor described in the above-mentioned prior art and has the following features. .

That is, the pulse number counting section 4a, the comparison section 4b,
This is a configuration in which a detection holding determination unit 4 having a holding setting unit 4c is provided.

The pulse counting unit 4a includes a first judgment unit 1b
And the human body detection signals S5 and S output by the second determination unit 2b
6, the first sensor unit 1 and the second sensor unit 2 detect the presence of an object, and thereafter the first sensor unit 1 detects the object and Output unit 1a when the sensor unit 2 does not detect the presence of an object
The counting of the number of pulses output from is started. The pulse number counting unit 4a performs the counting operation until the first sensor unit 1 and the second sensor unit 2 stop detecting the presence of the object.

Here, when "the first sensor unit 1 detects an object and the second sensor unit 2 stops detecting the presence of the object", the object existing in the second area B is not detected. Because the object has changed its posture even though it is moving out of the second area B and further out of the first area A, even though the object exists in the second area B. In some cases, the presence of the second sensor unit 2 cannot be detected. In any case, in order to be in such a state, the object needs to move, but in the former case, the object needs to move greatly, and in the latter case, the object does not move much. No need to move. Therefore, the number of pulses to be counted is large in the former case and small in the latter case. Note that “the first sensor unit 1 and the second sensor unit 2 stop detecting the presence of the object” means that the object has moved out of the first area A in the former case. In the latter case, it means that the operation of changing the posture has been completed.

The comparing section 4b compares the number of pulses output from the pulse number counting section 4c with a predetermined threshold value. Comparison section 4b
If the number of pulses is smaller than the threshold value, it is determined that the latter is the case in which the presence of the object cannot be detected by the second sensor unit 2 because the posture of the object has changed. , And outputs the holding required signal S10 to the holding setting unit 4c. When the number of pulses is larger than the threshold value, the comparing unit 4b determines that the former is the case of the above example, that is, the case where the object has moved out of the first area A, and the holding unnecessary signal S11 Is output to the holding setting unit 4c. , Holding setting unit 4c
Is monitoring the output of the logical sum unit 3a, when the human body presence signal S7 is not output, and when the holding required signal S10 is input from the comparing unit 4b, it replaces the sensing determination holding unit 3b. And outputs a human body presence signal S12 equivalent to the human body presence signal S9 to the outside.

Next, the operation of the hot-wire / ultrasonic combined detection sensor constructed as described above will be described with reference to the time chart of FIG. 2 based on the operation of the human body D when entering the toilet shown in FIGS. explain.

First, at time t1, the human body D is
11 enters the toilet as shown in FIG. 11, the first sensor unit 1 detects the presence of the human body D, and the human body detection signal S5 is turned on. At this time, since the human body D has not yet entered the second area B, the second sensor unit 2 does not detect the human body D, and the human body detection signal S6 is off. Therefore, the human body presence signals S7 and S9 are turned on.

Next, as shown in FIG. 12, during the period from time t2 to time t3, as the human body D moves near the toilet seat, the first sensor unit 1 detects the presence of the human body D and outputs a human body detection signal. While maintaining S5 on, the second sensor unit 2 also detects the human body D and turns on the human body detection signal S6.
Therefore, the human body presence signals S7 and S9 are turned on.

Then, between times t3 and t4,
As shown in FIG. 13, when the human body D sits on the toilet seat and stops moving, the first sensor unit 1 cannot detect the presence of the human body D and the human body detection signal S5 is turned off, but the second sensor Since the unit 2 detects the human body D, the human body detection signal S6 is on. Therefore, the human body presence signals S7 and S9 are turned on.

Thereafter, from time t4 to time t6,
The posture changes while the human body D is sitting, and the second sensor unit 2 cannot detect the human body D due to the change in the posture, even though the human body D exists in the second area B. The signal S6 may be turned off. In FIG. 9, at time t5, the second sensor unit 2 cannot detect the human body D.

The pulse number counting section 4a starts counting the number of pulses from time t5. And the pulse number counting section 4a
Counts until time t6 when the operation of changing the posture of the human body D ends and the first sensor unit 1 cannot detect the human body D. In FIG. 2, E represents a pulse output from the output unit 1a, and F
Represents pulses counted in the pulses. At time t6, the comparing section 4b compares the predetermined threshold value with the counted number of pulses. If the counted number of pulses is smaller than the threshold value, the comparing unit 4b outputs the holding required signal S10 to the holding setting unit 4c, and when the holding setting unit 4c receives the holding required signal S10, the human body presence signal S12
Is output. The holding setting unit 4c continues to output the human body presence signal S12 until time t8 when the human body D is detected by the first sensor unit 1.

Accordingly, the human body detection signal S9 or the human body detection signal S12 is output from the heat ray ultrasonic composite detection sensor, and the output of the human body presence signal is performed between the time t7 and the time t8 as in the prior art. Is not interrupted.

[Second Embodiment] FIG. 3 is a block diagram showing the configuration of a hot-wire / ultrasonic combined detection sensor. In FIG. 3, the same reference numerals are given to the same portions as those of the hot-wire / ultrasonic combined-type detection sensor described in the above-described first embodiment, and the detailed description of the same portions will be omitted. .

The hot-wire / ultrasonic combined-type detection sensor of this embodiment shown in FIG. 3 is different from the hot-wire / ultrasonic combined-type detection sensor described in the first embodiment described above in that it has the following features. It is.

That is, the holding setting unit 4d monitors the output of the OR unit 3a, and when the human body presence signal S7 is not output, the holding required signal S10 is input from the comparing unit 4b. Then, a human body presence signal S12 equivalent to the human body presence signal S9 is output to the outside for a certain period T2 instead of the sensing determination holding unit 3b. The holding setting unit 4d determines the certain period T2 according to the number of pulses counted by the pulse number counting unit 4a. Specifically, the holding setting unit 4d sets the fixed period T2 shorter as the number of pulses counted by the pulse number counting unit 4a increases, and sets the fixed period T2 longer as the number of pulses decreases.

Therefore, if the number of pulses is smaller than the threshold value, the comparing section 4b determines that an object exists in the second area B, and outputs the holding required signal S10 to the holding setting section 4.
d, this determination is different from the reality, and even in the case where the object does not already exist in the second area B, the holding setting unit 4d keeps outputting the human body presence signal S12 forever. Without output,
After the elapse of the certain period T2, the human body presence signal S12 is not output. Therefore, for example, when the combined heat and ultrasonic detection sensor is used for controlling the illumination of the toilet, it is possible to avoid a situation in which the illumination is lit forever due to erroneous determination of the comparing unit 4b.

Further, the fixed period T2 is shortened as the number of counted pulses is increased, and is lengthened as the number of pulses is decreased. Therefore, in the case of a pulse number near the threshold value, the human body D
Is more likely to have moved out of the first area A than when the number of pulses is small, so the fixed period T2 is set short. Therefore, the higher the possibility that the object exists in the second area B, the longer the certain period T2, and the lower the possibility that the object exists in the second area B, the shorter the certain period T2. The human body presence signal S1 for longer than necessary
It is possible to output the human body presence signal S12 more accurately without outputting the number 2.

The certain period T2 is, for example, a time period from when the human body D changes posture and cannot be detected by the second sensor unit 2 until it is considered that the human body D will operate again at least. May be a predetermined time such as about 5 minutes.

[0046]

According to the invention as set forth in the first aspect, the pulse number counting section includes the first sensor section and the second sensor section. The second sensor unit is detecting the presence of an object,
Thereafter, when the first sensor unit detects the object and the second sensor unit no longer detects the presence of the object, the first sensor unit detects the object from the time when the second sensor unit no longer detects the presence of the object. By the time the sensor unit and the second sensor unit no longer detect the presence of the object, count the number of pulses output by the first sensor unit, and the comparing unit compares the number of pulses with a predetermined threshold. Compare, the holding setting unit, when the pulse number is smaller than a predetermined threshold, the first sensor unit or the time after the first sensor unit and the second sensor unit no longer detect an object or During the period until the second sensor unit detects the object, since it is determined that an object is present in the first area and a human body presence signal is output, when a human body is present in the second area, When the second sensor cannot detect the human body Even if there is, there is an effect that it is possible to provide a hot-wire ultrasonic composite type detection sensor that does not judge that a human body does not exist, and thus can reduce erroneous determination that it is determined that a human body does not exist even though a human body exists. Play.

According to the second aspect of the present invention, the pulse number counting section detects that the first sensor section and the second sensor section detect the presence of an object, and thereafter, the first sensor section The unit detects an object, and when the second sensor unit no longer detects the presence of the object, the first sensor unit and the second sensor unit start from the time when the second sensor unit no longer detects the presence of the object. Counting the number of pulses output by the first sensor unit until the sensor unit no longer detects the presence of the object, the comparing unit compares the number of pulses with a predetermined threshold value, When the number of pulses is smaller than a predetermined threshold, the object is present in the first area for a certain period from the time when the first sensor unit and the second sensor unit no longer detect the object. Then, it outputs the human body presence signal,
In the case where the human body is present in the second area, even if the second sensor unit cannot detect the human body,
It does not judge that the human body does not exist, so it is possible to reduce the erroneous judgment that the human body is present even though the human body is present, and in fact, the object does not already exist in the second area Even in such a case, there is an effect that the holding / setting unit can provide a hot-wire / ultrasonic combined detection sensor that does not output a human body presence signal forever.

According to the third aspect of the present invention, there is provided the second aspect.
In addition to the effects of the invention described above, the holding and setting unit has a predetermined length of time as a fixed period, so that it is possible to provide a heat ray ultrasonic combined detection sensor having a simple configuration. Play.

According to the fourth aspect of the present invention, the hold setting unit sets the fixed period to be longer as the counted number of pulses is smaller, and sets the fixed period to be shorter as the counted number of pulses is larger. There is an effect that it is possible to provide a heat ray ultrasonic combined detection sensor that can output a human body presence signal more accurately without outputting a human body presence signal for a longer period than necessary.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a heat ray ultrasonic combined detection sensor of the present invention.

FIG. 2 is a time chart illustrating an output of a first sensor unit, an output of a second sensor unit, and an output of a hot-wire ultrasonic hybrid detection sensor.

FIG. 3 is a block diagram showing another example of the configuration of the combined heat and ultrasonic detection sensor of the present invention.

FIG. 4 is a block diagram showing a configuration example of a conventional hot-wire / ultrasonic combined detection sensor.

FIG. 5 is a side view illustrating a first area and a second area.

FIG. 6 is a side view illustrating a first area of the heat ray ultrasonic combined detection sensor.

FIG. 7 is an explanatory diagram of an output signal of a first sensor.

FIG. 8 is an explanatory diagram of an output signal of a first sensor.

FIG. 9 is a time chart illustrating the output of the first sensor unit, the output of the second sensor unit, and the output of the combined hot-wire and ultrasonic detection sensor.

FIG. 10 is a side view illustrating a state in which a human body enters a toilet and sits down.

FIG. 11 is a side view illustrating a state where a human body enters a toilet and sits down.

FIG. 12 is a side view illustrating a state where a human body enters a toilet and sits down.

FIG. 13 is a side view illustrating a state where a human body enters a toilet and sits down.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 First sensor part 1a Output part 1b First judgment part 2 Second sensor part 2a Transmitting and receiving part 2b Second judgment part 3 General judgment part 4a Pulse number counting part 4b Comparison part 4c Holding setting part 4d Holding setting Part A First area B Second area D Human body

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI G01V 11/00 G01V 11/00 G08B 13/191 G08B 13/191

Claims (4)

[Claims] An output unit that outputs a number of pulses corresponding to a heat change amount in a first area; and a first determination unit that determines that a human body is present when the pulses are output. And a first sensor unit for detecting the presence of an object in the first area, and transmitting ultrasonic waves to a second area smaller than the first area and included in the first area, A transmitting / receiving unit that receives a reflected wave from an object present in the area, and an ultrasonic pattern transmitted from the transmitting / receiving unit, reflected by the object, and received by the transmitting / receiving unit, in the second area. A second determination unit that determines the presence of the object, and a second sensor unit that detects the presence of the object in the second area, and the first determination unit detects the presence of the object. Period, or the period when the second judgment unit is detecting the presence of the object, or the first judgment unit and the second judgment unit For a predetermined period after the disconnection part no longer detects the object, a comprehensive determination unit that determines that an object is present in the first area and outputs a human body presence signal, When the sensor unit and the second sensor unit are detecting the presence of the object, then the first sensor unit detects the object and the second sensor unit no longer detects the presence of the object In this case, the first sensor unit and the second sensor unit no longer detect the presence of the object until the second sensor unit no longer detects the presence of the object. A pulse number counting unit that counts the number of pulses to be output, a comparing unit that compares the number of pulses with a predetermined threshold value, and when the pulse number is smaller than a predetermined threshold value, the first sensor unit and The second sensor unit no longer detects objects From the time when the first sensor unit or the second sensor unit detects the object thereafter, a holding setting unit that determines that an object is present in the first area and outputs a human body presence signal. , A hot-wire ultrasonic composite detection sensor. 2. An output unit for outputting a number of pulses corresponding to a heat change amount in a first area, and a first determination unit for determining that a human body is present when the pulses are output. And a first sensor unit for detecting the presence of an object in the first area, and transmitting ultrasonic waves to a second area smaller than the first area and included in the first area, A transmitting / receiving unit that receives a reflected wave from an object present in the area, and an ultrasonic pattern transmitted from the transmitting / receiving unit, reflected by the object, and received by the transmitting / receiving unit, in the second area. A second determination unit that determines the presence of the object, and a second sensor unit that detects the presence of the object in the second area, and the first determination unit detects the presence of the object. Period, or the period when the second judgment unit is detecting the presence of the object, or the first judgment unit and the second judgment unit For a predetermined period after the disconnection part no longer detects the object, a comprehensive determination unit that determines that an object is present in the first area and outputs a human body presence signal, When the sensor unit and the second sensor unit are detecting the presence of the object, then the first sensor unit detects the object and the second sensor unit no longer detects the presence of the object In this case, the first sensor unit and the second sensor unit no longer detect the presence of the object until the second sensor unit no longer detects the presence of the object. A pulse number counting unit that counts the number of pulses to be output, a comparing unit that compares the number of pulses with a predetermined threshold value, and when the pulse number is smaller than a predetermined threshold value, the first sensor unit and The second sensor unit no longer detects objects Certain period from time point includes a holding setting unit determines that the object is present in the first area and outputs a human presence signal,
A composite heat ray ultrasonic detection sensor, comprising: 3. The hot-wire / ultrasonic combined detection sensor according to claim 2, wherein the holding and setting section has a predetermined time as a fixed period. 4. The heating wire according to claim 2, wherein the holding setting unit sets the fixed period longer as the number of counted pulses is smaller, and sets the fixed period shorter as the number of counted pulses is larger. Ultrasonic composite detection sensor.