JP2005105681A - Human body detecting device and automatic faucet device mounted with this device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly detect the existence of the human body, even when a dispersion value and a standard deviation become large, by making an infrared ray radiated from a fluorescent lamp incident on a sensor, in a human body detecting device using the reflective noncontact active sensor used for an automatic faucet device. <P>SOLUTION: This human body detecting device detects the existence of the human body on the basis of an average value, by projecting the infrared light from a light projecting part 11 of an optical sensor 10 built in a faucet body of the automatic faucet device 1, periodically sampling data on a detecting signal of detecting the reflected light by a light receiving part 12, and arithmetically operating the average value and a dispersion or standard deviation from a plurality of continuously sampled data including the newest data. The human body detecting device continuously detects the existence of the human body when a present state is the existence of the human body, by continuously detecting the nonexistence of the human body when the present state is the nonexistence of the human body, when the dispersion or standard deviation becomes a predetermined value or more in a state of setting the average value to a threshold value or less of the existence of the human body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a human body detection device used in an apparatus that automatically operates by detecting a human body, such as an automatic faucet, a urinal or an automatic cleaning device for a urinal, and in particular, from the magnitude of fluctuation in detection signal data, The present invention relates to a human body detection device that detects movement.

  A conventional human body detection device projects light such as infrared light from a light projecting unit of a non-contact active sensor, receives the reflected light by a light receiving unit, periodically samples the detection signal data, and continuously A variance value or standard deviation is calculated from a plurality of sampled data, and if the variance value or standard deviation is equal to or greater than a predetermined value for a predetermined time, the presence of a human body is detected (for example, patent Reference 1).

In recent years, however, inverter fluorescent lamps are often installed in bathrooms and toilets, but some inverter fluorescent lamps emit a large amount of infrared radiation for several minutes immediately after lighting. I came. For this reason, when the timing at which the infrared light emitted from the fluorescent lamp enters the sensor coincides with the timing at which the detection signal data of the light receiving section is sampled, the detection signal data of the light receiving section becomes larger than the original value, and the fluorescent lamp When the timing at which the infrared rays emitted from the sensor are incident on the sensor and the timing for sampling the detection signal data of the light receiving unit do not match, the detection signal data of the light receiving unit is small, so there is actually no person Nevertheless, there is a problem that the dispersion value and the standard deviation become larger than a predetermined value, and the presence of a human body is erroneously detected and the automatic faucet discharges water without permission.
JP-A-7-233548 (page 6-7, FIG. 6)

  The present invention has been made to solve the above problems, and the problem of the present invention is that the infrared light emitted from the fluorescent lamp is incident on the light receiving portion of the non-contact active sensor. It is an object of the present invention to provide a human body detection device that can correctly detect the presence or absence of a human body even when the variance value and the standard deviation increase despite the fact that there is no person.

  In order to achieve the above object, the first invention includes a light projecting unit that projects light such as infrared rays, and a light receiving unit that receives light including reflected light of light projected from the light projecting unit. A non-contact active sensor, sampling means for periodically sampling data of detection signals of the light receiving unit, first statistical calculation means for calculating an average value from a plurality of data sampled by the sampling means, A second statistical calculation means for calculating a variance value or a standard deviation from a plurality of data, and an object for determining the presence or absence of a detection object based on outputs of the first statistical calculation means and the second statistical calculation means In a human body detection device comprising presence / absence determination means and determination result storage means for storing the previous determination result of the object presence / absence determination means, the calculation result of the data of the first statistical calculation means is predetermined. When the calculation result of the data of the second statistical calculation means is greater than or equal to a predetermined value and less than the threshold value, the object presence / absence determination means continues the determination result stored in the determination result storage means. Even if the average value is low in the absence of people, even if the dispersion value or standard deviation increases, the human body will not be present, so the light reception signal level of the sensor will fluctuate due to the influence of infrared rays emitted from the fluorescent lamp. Even if the presence or absence of the human body can be detected accurately, and the variance or standard deviation increases once the human body is present due to the average value of the received light signal level, the received light signal due to the movement of the human hand or body Since it is possible to detect a level fluctuation and to continuously detect the presence of a human body, the usability does not deteriorate.

  The second invention includes a non-contact active sensor having a light projecting unit that projects light such as infrared light, and a light receiving unit that receives light including reflected light of light projected from the light projecting unit, Sampling means for periodically sampling the detection signal data of the light receiving unit, first statistical calculation means for calculating an average value from a plurality of data sampled by the sampling means, and a variance value from the plurality of data Alternatively, second statistical calculation means for calculating a standard deviation, object presence / absence determination means for determining the presence / absence of a detection target based on outputs of the first statistical calculation means and the second statistical calculation means, and the first When the calculation result of the data of one statistical calculation means is less than a predetermined threshold value and the calculation result of the data of the second statistical calculation means is a predetermined value or more, the non-contact active sensor is the light projecting unit. A third statistic that samples the detection signal data of the light receiving unit without performing light projection by the sampling means and calculates at least one kind of statistical value from a plurality of data sampled without performing the light projection In the human body detection apparatus comprising a calculation means and a second object presence / absence determination means for determining the presence / absence of a detection target based on a calculation result of the third statistical calculation means, the data of the third statistical calculation means The second object presence / absence determining means determines that there is no detection target when the calculation result of the second statistical object is less than a predetermined value, and the second object is determined when the calculation result of the data of the third statistical calculation means is less than the predetermined value. Since the presence / absence determination means determines that there is an object to be detected, even if the light reception signal level fluctuates due to infrared rays emitted from the fluorescent lamp, the presence / absence determination means does not project light from the sensor. The level of infrared light emitted from the fluorescent lamp is detected based on the light reception signal level that has been pulled, and if the level is high, the light reception signal level fluctuates due to human movement, and the dispersion value and standard deviation are not large. Since it can be seen that this is due to the influence of infrared rays from the fluorescent lamp, it can be detected that there is no person, and if the light reception signal level of the sensor fluctuates due to the movement of the person's hand or body, Since the received light signal level is low when sampling is performed without performing light, it is possible to detect the presence of a person and to accurately detect the presence or absence of a human body.

  In a third aspect of the invention, when the sampling means samples the detection signal data of the light receiving unit without performing light projection, the sampling means performs the light projection and samples the detection signal data of the light receiving unit at a shorter cycle. Since the detection signal data is sampled, it is possible to shorten the time until the light reception signal is sampled by projecting light again after shifting to the operation of sampling the light reception signal without performing light projection, Even if a person comes immediately after shifting to the operation of sampling the received light signal without performing light projection, the delay time until the presence of a human body can be detected can be shortened, and the usability does not deteriorate.

  In a fourth aspect of the invention, the third statistical calculation means performs calculation with a smaller number of data than the first statistical calculation means and the second statistical calculation means. It is possible to shorten the time from when the operation shifts to sampling the signal to when the light emission is performed again and when the light reception signal is sampled. Even if it comes, it is possible to shorten the delay time until the presence of a human body is detected, and the usability does not deteriorate.

  5th invention is a non-contact active sensor which has a light projection part which projects light, such as infrared rays, and the light-receiving part which receives the light containing the reflected light of the light projected from the said light projection part, Sampling means for periodically sampling the detection signal data of the light receiving unit, first statistical calculation means for calculating an average value from a plurality of data sampled by the sampling means, and a variance value from the plurality of data Alternatively, second statistical calculation means for calculating a standard deviation, object presence / absence determination means for determining the presence / absence of a detection target based on outputs of the first statistical calculation means and the second statistical calculation means, and the first When the calculation result of the data of one statistical calculation means is less than a predetermined threshold value and the calculation result of the data of the second statistical calculation means is a predetermined value or more, the non-contact active sensor is the light projecting unit. An operation of sampling the detection signal data of the light receiving unit without performing light projection by the sampling unit, and an operation of performing light projection from the light projecting unit and sampling the detection signal data of the light receiving unit by the sampling unit Alternately, based on the calculation result of the third statistical calculation means, the third statistical calculation means for calculating at least one kind of statistical value from a plurality of data sampled without performing the projection In the human body detection apparatus provided with the second object presence / absence determination means for determining the presence / absence of the detection target object, the second object presence / absence determination means when the calculation result of the data of the third statistical calculation means is a predetermined value or more. Determines that there is no detection object, and when the calculation result of the data of the third statistical calculation means is less than a predetermined value, the second object presence determination means determines that there is a detection object As a result, even if the received light signal level fluctuates due to the infrared light emitted from the fluorescent lamp, the infrared light emitted from the fluorescent lamp is affected by the received light signal level sampled without performing the light projection from the sensor. The level is detected. If the level is high, the received light signal level fluctuates due to human movement and the dispersion value and standard deviation are not increased, but it is understood that it is due to the influence of infrared rays from the fluorescent lamp. If the level of the light reception signal of the sensor can be detected due to the movement of a person's hand or body, the light reception signal level when sampling without light projection is low. Therefore, it is possible to detect the presence of a person and to accurately detect the presence or absence of a human body. In addition, since the operation of sampling the received light signal by projecting light and the operation of sampling the received light signal without projecting light are performed alternately, no matter what timing the person comes, until the presence of a human body is detected The delay time can be minimized and the usability is not degraded.

  In the sixth aspect of the invention, the statistical value calculated by the third statistical calculation means is at least one of an average value, a variance value, and a standard deviation, so that infrared rays emitted from the fluorescent lamp are transmitted to the sensor. Even if there is a change in the value of the received light signal level sampled without projecting light from the sensor, the incident timing and the received light signal level sampling timing may or may not match. It is possible to reliably detect whether or not radiated.

  Since the seventh invention is provided with the automatic faucet device, the human body detection device, the water supply means for supplying water, and the control means for controlling the water supply means by the output of the human body detection device, Due to the shape characteristics of the bowl such as the wash basin where the automatic faucet is installed, the infrared rays emitted from the fluorescent lamps gather, and a large amount of infrared rays from the fluorescent lamps enter the sensor of the automatic faucet, and the sensor receives light. Even if the level fluctuates greatly, it can reliably detect whether the light reception level of the sensor is fluctuating due to the movement of the hand held by a person, or whether the light reception level of the sensor is fluctuating due to the infrared rays emitted from the fluorescent lamp, It becomes possible to prevent malfunction.

  According to the present invention, when the infrared light emitted from the fluorescent lamp enters the sensor and the light reception signal level of the sensor fluctuates, the dispersion value or the standard deviation becomes larger than the predetermined value even though there is no person actually However, it is possible to accurately detect the presence or absence of a human body by determining whether it is due to infrared radiation emitted from a fluorescent lamp or due to movement of the human body, so malfunctions of automatic faucets and toilet flushers There is an effect that can be prevented.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a configuration diagram of an automatic faucet device according to an embodiment of the present invention, FIG. 2 is a configuration diagram of an active sensor, FIG. 3 is a control flowchart of the automatic faucet device, and FIG. FIG. 5 is a time chart showing the reflected signal level of the sensor and each statistical value.

  As shown in FIG. 1, the automatic faucet device 1 includes a wash basin 2, a bowl 3 provided in front of the wash basin 2, and a base that is erected on the upper surface of the back of the wash basin 2 with a slight inclination toward the front side. 5 is connected to the upper end of the spout 4 with a slight downward inclination, a water source 8 for supplying water to the spout 4, and water discharge / stop of the discharge water 6 disposed between the spout 4 and the water source 8. An electromagnetic valve 7 to be performed and an object detection device 9 disposed inside the base portion 5, and the discharged water 6 discharged obliquely downward from the spout 4 fall into the bowl 3 while drawing a parabola. ing.

  As shown in FIG. 2, the object detection device 9 includes a light sensor 10 as a reflective non-contact active sensor, a calculation unit 14, and an output unit 15. The light sensor 10 projects infrared rays toward the outside. The light projecting unit 11 includes a light receiving unit 12 that receives infrared rays reflected from a human hand or a bowl surface, and an amplification unit 13 that amplifies a signal received by the light receiving unit. 1 projects into a space below the spout 4 in a direction inclined slightly further below the spout 4 in a range (light projection area) indicated by α in FIG. The light receiving unit 12 converts incident light into a voltage signal and outputs the voltage signal to the amplification unit 13. The incident range (light receiving region) is limited to the range indicated by β in FIG. Has been. The optical sensor 10 can satisfactorily detect an object existing in a range (detection region) indicated by γ in FIG. 1 where the light projecting region α and the light receiving region β overlap.

  Further, the calculation unit 14 of the object detection device 9 is configured by a microcomputer having an A / D conversion function, and the sampling frequency of the A / D conversion can be changed by a program. In synchronism with the light projecting period of the light projecting unit 11, the analog voltage input from the amplifying unit 13 is stored as digital data in a time series in a time series, and this data is statistically calculated and processed. Based on the result, a valve opening or closing signal is output to the output unit 15, and the output unit 15 is configured to convert the signal from the calculation unit 14 into a valve driving voltage and output it to the electromagnetic valve 7.

  In the above configuration, as shown in FIG. 3, when the power is turned on, infrared light is projected from the light projecting unit 11 by the sensor light projecting / receiving process routine, the reflected signal is received by the light receiving unit 12, and the signal is converted to an analog signal by the amplifying unit 13. Data is stored (S1), and the received light signal level obtained there is calculated as an average value and variance by a statistical value calculation processing routine (S2). Then, the reference level setting routine is used to set the reference level of the absence of human body based on the average value and the variance value (S3), and the human body presence / absence determination processing routine subsequently determines whether the current state is the presence or absence of the human body ( In S4), the operation as an automatic faucet is performed by controlling the output signal to the solenoid valve 7 by the water discharge control processing routine and controlling the water discharge and water stop (S5).

  Next, the human body presence / absence determination processing routine (S4) will be described with reference to FIG. First, it is checked whether the current state is the presence or absence of a human body (S101). If there is a human body, the average value obtained by the statistical value calculation processing routine (S2) and the reference level setting processing routine (S3) are obtained. If the average value is 4 or more larger than the reference level, the human hand is in the ball and the reflected signal level is high. continue. If the average value is not larger than 4 with respect to the reference level (S102), then the variance obtained in the statistical value calculation routine (S2) is checked (S103). Therefore, the counter A for switching to no human body is cleared to 0 (S104), the human body presence / absence determination process is terminated, and the presence of the human body is continued. If the result of checking the dispersion is less than 4 (S103), the counter A for switching to no human body is incremented by 1 (S105). If A is less than 4 (S106), the hand washing operation temporarily Since the average value and the variance of the reflected light level may have become small, the human body presence / absence determination process is terminated and the presence of the human body is continued. If the counter A for switching to no human body is 4 or more (S106), it is determined that there is no human body because the state where both the average value and the variance are small continues to some extent, and it is determined that there is no human body (S107). The counter A for switching to none is cleared to 0 (S108).

  Next, when the current state is no human body (S101), the average value obtained in the statistical value calculation processing routine (S2) is compared with the reference level obtained in the reference level setting processing routine (S3) (S109). If the average value is 8 or more higher than the reference level, it is determined that a human hand has been put in the ball and it is determined that there is a human body (S110), and the human body presence / absence determination process is terminated. If the average value is not larger than 8 with respect to the reference level (S109), even if the dispersion obtained by the statistical value calculation processing routine is large by ending the processing as it is, it is the infrared ray emitted from the fluorescent lamp. It is determined that this is because the light is incident on the sensor and it is not because the hand of the person has been presented.

  When the control is performed according to the above description, as shown in FIG. 5, first, in the state where no human hand is put out, the average value of the reflected signal level is the same as the reference level, and therefore no human body is detected. In this state, when a human hand is pushed out and the average value of the reflected signal level becomes 8 or more larger than the reference level, the presence of the human body is detected, and the electromagnetic valve 7 is opened to discharge water. And even if the hand is about to go out of the detection range of the sensor during the hand washing operation and the average value is only about 2 larger than the reference level, the variance is 4 or more at that time, so the presence of the human body is continued. The water discharge continues without interruption. Furthermore, even if the hand stops during watering and the variance is less than 4, the average value is 4 or more higher than the reference level, so the presence of the human body continues, after which the user's hands are actually lost and the average value is the reference level. When the variance is less than 4, no human body is detected and the water is stopped.

  Next, the fluorescent lamp in the room is turned on in the state where the person has not put out his hand, and the timing at which the infrared rays radiated from the fluorescent lamp enter the sensor 10 overlaps with the timing at which the sensor 10 samples the reflected signal. When the next sampling, the state where the amount of infrared light emitted from the fluorescent lamp is small and the reflected signal level is small is repeated, and the average value of the reflected signal level is maintained even if the dispersion is 4 or more Is not greater than 8 with respect to the reference level, it is not detected that there is a human body, and there is no phenomenon that water is discharged without permission even though there is no automatic faucet.

  Next, another embodiment relating to human body presence / absence determination processing will be described with reference to FIGS. 6, 7, and 8. First, the sensor light projecting / receiving process routine (S1) shown in FIG. 6 is executed. First, it waits for the sampling timer Ts that determines the sampling period of the sensor 10 to become 0 (S201), and checks whether the non-light emitting flag is 1 when the timer Ts becomes 0 and the sampling timing is reached (S202). Usually, since the non-projection flag is 0, sensor light is emitted from the light projecting unit 11 (S203), the reflected signal is received by the light receiving unit 12, and the signal is stored in X0 as analog signal data by the amplifying unit 13 ( S204). In order to determine the next sampling timing, 62.5 ms is set in Ts (S205), and the sensor light projecting / receiving process is terminated.

  Subsequently, the statistical value calculation processing routine (S2) shown in FIG. 7 is executed. First, it is checked whether or not the non-projection flag is 1 (S301). Since the non-projection flag is 0 at this time, the average of the eight most recent reflected signal levels sampled by the sensor projection / reception processing routine is calculated. Substituting into 1 (S302), the variance of the reflected signal level of the last 8 times is calculated and substituted into variance 1 (S303). Then, the process of substituting the reflected signal level data X6 sampled six times before into the reflected signal level data X7 sampled seven times ago, and similarly substituting the data X5 sampled five times before into X6. The latest sampling data X0 is repeatedly substituted into the previous sampling data X1 (S304), and the counter C for counting the number of times of sampling without performing projection is cleared to 0 (S305), and the statistical value calculation is performed. The process ends.

  Subsequently, after the reference level setting processing routine (S3) sets the human body absence reference level, the human body presence / absence determination processing routine (S4) shown in FIG. 8 is executed. First, it is checked whether the current state is the presence or absence of a human body (S101). If there is a human body, the average value 1 obtained in the statistical value calculation processing routine (S2) and the reference level setting processing routine (S3) are obtained. Compared with the reference level (S102), if the average value 1 is 4 or more higher than the reference level, the human hand is in the ball and the reflected signal level is high. Continue to exist. If the average value 1 is not larger than 4 with respect to the reference level (S102), then the variance 1 obtained in the statistical value calculation routine (S2) is checked (S103). It is determined that the variance 1 is large because it is in the ball and moves, the counter A for switching to no human body is cleared to 0 (S104), the human body presence / absence determination process is terminated, and the presence of the human body is continued. If the result of checking dispersion 1 is less than 4 (S103), the counter A for switching to no human body is incremented by 1 (S105). If A is less than 4 (S106), the hand washing operation temporarily Since the average value 1 and the variance 1 of the reflected light level may have decreased, the human body presence / absence determination process is terminated and the presence of the human body is continued. If the counter A for switching to no human body is 4 or more (S106), the state where both the average value 1 and the variance 1 are small is continued to some extent, so that it is determined that there is no human hand and it is determined that there is no human body (S107). ) After clearing the counter A for switching to no human body to 0 (S108), the human body presence / absence determination process is terminated.

  If the current state is that there is no human body (S101), it is first checked whether or not the non-light projection flag is 1 (S109). Since the non-light emission flag is 0 at this time, the statistical value calculation processing is next performed. The average value 1 obtained in the routine (S2) is compared with the reference level obtained in the reference level setting processing routine (S3) (S110), and if the average value 1 is 8 or more larger than the reference level, the human hand It is determined that it has been put out in the ball and it is determined that there is a human body (S116). Then, the counter B that checks whether or not the state where the variance 1 is large is cleared to 0 (S117), and the human body presence / absence determination process is terminated. If the average value 1 is not larger than 8 or more than the reference level (S110), then the variance 1 obtained in the statistical value calculation processing routine (S2) is checked (S111). The counter B is cleared to 0 (S112), the human body presence / absence determination process is terminated, and no human body is continued. If the result of checking the variance 1 is 6 or more (S111), there is a possibility that a human hand is put in the ball, so the counter B is incremented by 1 (S113). If it is less than 4 (S114), the process is terminated and the absence of a human body is continued, but if B is 4 or more (S114), the average value 1 of the reflected signal level is small because a human hand is presented. In order to check whether the dispersion 1 is large or whether the dispersion 1 is large due to the infrared rays emitted from the fluorescent lamp, 1 is set in the non-projection flag (S115), and the reflection is performed without performing the sensor projection. The process proceeds to a process for checking the signal level.

  In a state where the non-light emitting flag 1 is set, the sensor light projecting / receiving process shown in FIG. 6 is executed again. First, it is checked whether the sampling timer Ts is 0 (S201). If it is 0, the timing of sampling the received light signal is reached, so the non-light emitting flag is checked (S202), and the non-light emitting flag is 1 this time. For this reason, the reflected light is received by the light receiving unit 12 without performing sensor projection, and the signal is stored in X0 as analog signal data by the amplifying unit 13 (S204). In order to determine the next sampling timing, 62.5 ms is set in Ts (S205), and the sensor light projecting / receiving process is terminated.

  Subsequently, the statistical value calculation processing routine (S2) shown in FIG. 7 is executed. First, when the non-projection flag is checked, it is 1 (S301), so X0 stored earlier is substituted for Y0 (S306). Then, the counter C indicating the number of times of sampling without performing the sensor projection is checked (S307). If it is less than 3, C is incremented by 1 (S309), and the sampling data Y2 from the previous two times is sampled three times before. Data Y3, Y1 into Y2, and the latest sampling data Y0 are sequentially substituted into the previous sampling data Y1 (S310), and this process is terminated.

  Then, the human body presence / absence determination processing routine (S4) shown in FIG. 8 is executed again. When the current state is checked to see if there is a human body, there is no human body (S101), and when the non-light projection flag is checked, it is 1 (S109). It is checked whether or not is 0 (S118). At this time, C is set to 1 by executing the statistical value calculation processing routine (S2), so the processing is ended as it is.

  Then, after these processes are repeated and the sampling process without performing the light projection is performed four times, when the statistical value calculation processing routine shown in FIG. 7 is executed, first, the non-light projection flag is checked (S301). , After substituting X0 into Y0 (S306), the counter C representing the number of times of sampling without light projection is 3 (S307), so the data Y0 to Y3 sampled without light projection are obtained. The average is calculated and substituted into the average value 2 (S308). Then, the counter C is cleared to 0 (S305), and the process ends.

  Then, when the human body presence / absence determination processing routine (S4) shown in FIG. 8 is executed again, it is first checked that the current state is no human body (S101), and that the non-light projection flag is 1 ( S109). Next, when the counter C is checked, it is 0 (S118), so the non-projection flag is cleared to 0 (S119) because sampling is completed without light projection (S119), and data sampled without light projection. The average value 2 obtained from the above is checked (S120). If the average value 2 is less than 8, the amount of infrared rays emitted from the fluorescent lamp is small, and the above-mentioned dispersion value 1 is large because the hand of the person has been pushed out. It is detected (S116), and the counter B that checks whether or not the state of large dispersion continues is cleared to 0 (S117). On the other hand, if the average value 2 is 8 or more, it is determined that the amount of infrared rays emitted from the fluorescent lamp is irradiated on the sensor 11 and therefore the dispersion value 1 has increased. (S117).

  The transition of the reflected signal level and each statistical value when controlled according to the above description will be described with reference to FIG. First, in the state where no human hand is being pushed out, the average value 1 of the reflected signal level is the same as the reference level, and therefore no human body is detected. In this state, the fluorescent lamp in the room is turned on, and the timing at which the infrared rays emitted from the fluorescent lamp enter the sensor 10 overlaps with the timing at which the sensor 10 samples the reflected signal. When the state where the amount of infrared rays emitted from the fluorescent lamp is small and the reflection signal level is small is repeated, and the state where the dispersion is 4 or more continues, the reflection signal level is sampled without performing projection and an average value of 2 is obtained. Ask. And since the average value 2 is 8 or more, the absence of a human body is detected, and the phenomenon that the automatic faucet discharges water without anybody does not occur.

  Next, when the human hand is presented in the state where no human body continues and the average value 1 of the reflected signal level does not increase by 8 or more with respect to the reference level, the variance 1 becomes 4 or more. The reflected signal level is sampled without performing projection, and an average value 2 is obtained. Kotonoki has an average value 2 of only about 4 and less than 8. This means that the variance 1 has been increased due to the movement of the human hand, the presence of a human body is detected, and the solenoid valve 7 is opened. Water is discharged. Once the presence of the human body is detected, the determination criterion for the presence of the human body changes to whether the average value 1 is 4 or more larger than the reference level or the variance 1 is 4 or more. Without detecting the average value 2, the presence of a human body is continuously detected. After that, the user's hand is actually gone, the average value 1 is the same as the reference level, and when the variance 1 is less than 4, no human body is detected. Water is stopped.

  Next, another embodiment relating to human body presence / absence determination processing will be described with reference to FIGS. 10, 11, and 12. First, the sensor light projecting / receiving process routine (S1) shown in FIG. 10 is executed. First, it waits for the sampling timer Ts that determines the sampling period of the sensor 10 to become 0 (S201), and checks whether the non-light emitting flag is 1 when the timer Ts becomes 0 and the sampling timing is reached (S202). Usually, since the non-projection flag is 0, the time 62.5 ms until the next sampling is set to Ts (S203), sensor light is emitted from the light projecting unit 11 (S204), and the reflected signal is received by the light receiving unit 12. The light is received, and the signal is stored in X0 as analog signal data by the amplifying unit 13 (S205), and the sensor light projecting / receiving process is terminated.

  Subsequently, the statistical value calculation processing routine (S2) shown in FIG. 11 is executed. First, it is checked whether or not the non-projection flag is 1 (S301). Since the non-projection flag is 0 at this time, the average of the eight most recent reflected signal levels sampled by the sensor projection / reception processing routine is calculated. Substituting into 1 (S302), the variance of the reflected signal level of the last 8 times is calculated and substituted into variance 1 (S303). Then, the process of substituting the reflected signal level data X6 sampled six times before into the reflected signal level data X7 sampled seven times ago, and similarly substituting the data X5 sampled five times before into X6. The latest sampling data X0 is repeatedly substituted into the previous sampling data X1 (S304), and the counter C for counting the number of times of sampling without performing projection is cleared to 0 (S305), and the statistical value calculation is performed. The process ends.

  Subsequently, after setting the human body absence reference level by the reference level setting processing routine (S3), the human body presence / absence determination processing routine (S4) shown in FIG. 12 is executed. First, it is checked whether the current state is the presence or absence of a human body (S101). If there is a human body, the average value 1 obtained in the statistical value calculation processing routine (S2) and the reference level setting processing routine (S3) are obtained. Compared with the reference level (S102), if the average value 1 is 4 or more higher than the reference level, the human hand is in the ball and the reflected signal level is high. Continue to exist. If the average value 1 is not larger than 4 with respect to the reference level (S102), then the variance 1 obtained in the statistical value calculation routine (S2) is checked (S103). It is determined that the variance 1 is large because it is in the ball and moves, the counter A for switching to no human body is cleared to 0 (S104), the human body presence / absence determination process is terminated, and the presence of the human body is continued. If the result of checking dispersion 1 is less than 4 (S103), the counter A for switching to no human body is incremented by 1 (S105). If A is less than 4 (S106), the hand washing operation temporarily Since the average value 1 and the variance 1 of the reflected light level may have decreased, the human body presence / absence determination process is terminated and the presence of the human body is continued. If the counter A for switching to no human body is 4 or more (S106), the state where both the average value 1 and the variance 1 are small is continued to some extent, so it is determined that there is no human hand and it is determined that there is no human body (S107). After clearing the counter A for switching to no human body to 0 (S108), the human body presence / absence determination process is terminated.

  If the current state is that there is no human body (S101), it is first checked whether or not the non-light projection flag is 1 (S109). Since the non-light emission flag is 0 at this time, the statistical value calculation processing is next performed. The average value 1 obtained in the routine (S2) is compared with the reference level obtained in the reference level setting processing routine (S3) (S110), and if the average value 1 is 8 or more larger than the reference level, the human hand It is determined that it has been inserted into the ball and it is determined that there is a human body (S117). Then, the counter B for checking whether or not the state where the variance 1 is large is cleared to 0 (S118), and the human body presence / absence determination processing is ended. If the average value 1 is not larger than 8 or more than the reference level (S110), then the variance 1 obtained in the statistical value calculation processing routine (S2) is checked (S111). The counter B is cleared to 0 (S112), the human body presence / absence determination process is terminated, and no human body is continued. If the result of checking the variance 1 is 6 or more (S111), there is a possibility that a human hand is put in the ball, so the counter B is incremented by 1 (S113). If it is less than 4 (S114), the process is terminated and the absence of a human body is continued, but if B is 4 or more (S114), the average value 1 of the reflected signal level is small because a human hand is presented. In order to check whether the dispersion 1 is large or whether the dispersion 1 is large due to the infrared rays emitted from the fluorescent lamp, 1 is set in the non-projection flag (S115) and sampling is performed without performing the sensor projection. A period of 31.25 ms is set in the sampling timer Ts (S116), and this process ends.

  In a state where the non-light emitting flag 1 is set, the sensor light projecting / receiving process shown in FIG. 10 is executed again. First, it is checked whether the sampling timer Ts is 0 (S201). If it is 0, the timing of sampling the received light signal is reached, so the non-light emitting flag is checked (S202), and the non-light emitting flag is 1 this time. Therefore, first, the next sampling period 31.25 ms is set to Ts (S206), then the reflected signal is received by the light receiving unit 12 without performing the sensor projection, and the signal is converted to X0 as analog signal data by the amplifying unit 13. Store (S205), and the sensor light projecting / receiving process is terminated.

  Subsequently, the statistical value calculation processing routine (S2) shown in FIG. 11 is executed. First, when the non-projection flag is checked, it is 1 (S301), so X0 stored earlier is substituted for Y0 (S306). Then, the counter C indicating the number of times of sampling without performing the sensor projection is checked (S307), and if it is less than 7, C is incremented by 1 (S309), and the sampling data Y6 6 times before is sampled 7 times before. Sequentially assign Y5 to Y6 to data Y7, and finally assign the latest sampling data Y0 to the previous sampling data Y1 (S310), and the process ends.

  Then, the human body presence / absence determination processing routine (S4) shown in FIG. 12 is executed again. When the current state is checked to see if there is a human body, there is no human body (S101), and when the non-light projection flag is checked, it is 1 (S109). It is checked whether or not is 0 (S119). At this time, C is set to 1 by executing the statistical value calculation processing routine (S2), so the processing is ended as it is.

  Then, after these processes are repeated and the sampling process without performing the light projection is performed eight times, when the statistical value calculation processing routine shown in FIG. 11 is executed, first, the non-light projection flag is checked (S301). Then, after substituting X0 into Y0 (S306), the counter C representing the number of times of sampling without light projection is checked to be 7 (S307), so that the data Y0 to Y7 sampled without light projection are obtained. The variance is calculated and assigned to variance 2 (S308). Then, the counter C is cleared to 0 (S305), and the process ends.

  When the human body presence / absence determination routine (S4) shown in FIG. 12 is executed again, first, it is checked that the current state is no human body (S101), and the non-light projection flag is checked (1) ( S109). Next, when the counter C is checked, it is 0 (S119), and therefore the non-projection flag is cleared to 0 (S120) because the sampling process without light projection is completed (S120), and the data sampled without light projection. The variance 2 obtained from the above is checked (S121). If the variance 2 is less than 4, the amount of infrared rays emitted from the fluorescent lamp is small, and the above-described variance value 1 is increased because a human hand is presented. Then, the counter B for checking whether or not the state of large dispersion has been continued is cleared to 0 (S118). If the dispersion 2 is 4 or more, it is determined that the amount of infrared rays emitted from the fluorescent lamp is irradiated on the sensor 11 and therefore the dispersion value 1 has increased. Therefore, the absence of a human body is continued and the counter B is set to 0. Clear (S118).

  The reflection signal level and the transition of each statistical value when controlled according to the above description will be described with reference to FIG. First, in the state where no human hand is being pushed out, the average value 1 of the reflected signal level is the same as the reference level, and therefore no human body is detected. In this state, the fluorescent lamp in the room is turned on, and the timing at which the infrared rays emitted from the fluorescent lamp enter the sensor 10 overlaps with the timing at which the sensor 10 samples the reflected signal. When the state where the amount of infrared rays emitted from the fluorescent lamp is small and the reflected signal level is small is repeated, and the state where the dispersion is 4 or more continues, the reflected signal level is sampled without performing projection and the dispersion 2 is obtained. . And since dispersion | distribution 2 is 4 or more, the absence of a human body is detected, and the phenomenon that an automatic faucet discharges water without a person does not occur.

  Next, when the human hand is presented in the state where no human body continues and the average value 1 of the reflected signal level does not increase by 8 or more with respect to the reference level, the variance 1 becomes 4 or more. The reflected signal level is sampled without performing projection, and the variance 2 is obtained. Since Kotonoki has a variance 2 of only about 3 and less than 4, it is judged that the variance 1 has increased due to the movement of a human hand, the presence of a human body is detected, the electromagnetic valve 7 is opened, and water discharge Is done. Once the presence of the human body is detected, the determination criterion for the presence of the human body is changed to whether the average value 1 is 4 or more larger than the reference level or the variance 1 is 4 or more. Without sampling and obtaining variance 2, the presence of a human body is continuously detected, after which the user's hands are actually gone and average value 1 is the same as the reference level, and when variance 1 is less than 4, no human body is detected. Detected and stopped.

  Next, another embodiment relating to the human body presence / absence determination process will be described with reference to FIGS. First, the sensor light projecting / receiving process routine (S1) shown in FIG. 14 is executed. First, it waits for the sampling timer Ts that determines the sampling period of the sensor 10 to become 0 (S201), and checks whether the non-light emitting flag is 1 when the timer Ts becomes 0 and the sampling timing is reached (S202). Usually, since the non-projection flag is 0, the time 62.5 ms until the next sampling is set to Ts (S203), sensor light is emitted from the light projecting unit 11 (S204), and the reflected signal is received by the light receiving unit 12. The light is received, and the signal is stored in X0 as analog signal data by the amplifying unit 13 (S205), and the sensor light projecting / receiving process is terminated.

  Subsequently, the statistical value calculation processing routine (S2) shown in FIG. 15 is executed. First, it is checked whether or not the non-projection flag is 1 (S301). Since the non-projection flag is 0 at this time, the counter C that counts the number of times of sampling without performing projection is cleared to 0 (S302). ). Then, the average of the eight most recent reflected signal levels sampled by the sensor light projecting / receiving process routine is calculated and substituted for the average value 1 (S303). Next, the last eight reflection signal level variances are calculated and substituted for variance 1 (S304). Then, the process of substituting the reflected signal level data X6 sampled six times before into the reflected signal level data X7 sampled seven times ago, and similarly substituting the data X5 sampled five times before into X6. The latest sampling data X0 is repeatedly substituted into the previous sampling data X1 (S305), and the statistical value calculation process is terminated.

  Subsequently, after setting the human body absence reference level by the reference level setting processing routine (S3), the human body presence / absence determination processing routine (S4) shown in FIG. 16 is executed. First, it is checked whether the current state is the presence or absence of a human body (S101). If there is a human body, the average value 1 obtained in the statistical value calculation processing routine (S2) and the reference level setting processing routine (S3) are obtained. Compared with the reference level (S102), if the average value 1 is 4 or more higher than the reference level, the human hand is in the ball and the reflected signal level is high. Continue to exist. If the average value 1 is not larger than 4 with respect to the reference level (S102), then the variance 1 obtained in the statistical value calculation routine (S2) is checked (S103). It is determined that the variance 1 is large because it is in the ball and moves, the counter A for switching to no human body is cleared to 0 (S104), the human body presence / absence determination process is terminated, and the presence of the human body is continued. If the result of checking dispersion 1 is less than 4 (S103), the counter A for switching to no human body is incremented by 1 (S105). If A is less than 4 (S106), the hand washing operation temporarily Since the average value 1 and the variance 1 of the reflected light level may have decreased, the human body presence / absence determination process is terminated and the presence of the human body is continued. If the counter A for switching to no human body is 4 or more (S106), the state where both the average value 1 and the variance 1 are small is continued to some extent, so it is determined that there is no human hand and it is determined that there is no human body (S107). After clearing the counter A for switching to no human body to 0 (S108), the human body presence / absence determination is terminated.

  If the current state is that there is no human body (S101), it is first checked whether or not the non-light projection flag is 1 (S109). Since the non-light emission flag is 0 at this time, the statistical value calculation processing is next performed. The average value 1 obtained in the routine (S2) is compared with the reference level obtained in the reference level setting processing routine (S3) (S110), and if the average value 1 is 8 or more larger than the reference level, the human hand It is determined that the ball is inserted into the ball, the non-light projection flag is cleared to 0 (S117), and a period of 62.5 ms when sampling is performed by performing normal light projection is set in the sampling timer Ts (S118). Then, it is determined that there is a human body (S119), and the counter B for checking whether or not the state where the variance 1 is large is cleared to 0 (S120), and the human body presence / absence determination processing is ended. If the average value 1 is not larger than 8 or more than the reference level (S110), then the variance 1 obtained in the statistical value calculation processing routine (S2) is checked (S111). The counter B is cleared to 0 (S112), the human body presence / absence determination process is terminated, and no human body is continued. If the result of checking the variance 1 is 6 or more (S111), there is a possibility that a human hand is put in the ball, so the counter B is incremented by 1 (S113). If it is less than 4 (S114), the process is terminated and the absence of a human body is continued, but if B is 4 or more (S114), the average value 1 of the reflected signal level is small because a human hand is presented. In order to check whether the dispersion 1 is large or whether the dispersion 1 is large due to the infrared rays emitted from the fluorescent lamp, 1 is set in the non-projection flag (S115) and sampling is performed without performing the sensor projection. A period of 31.25 ms is set in the sampling timer Ts (S116), and this process ends.

  In a state where the non-light emitting flag 1 is set, the sensor light projecting / receiving process shown in FIG. 14 is executed again. First, it is checked whether the sampling timer Ts is 0 (S201). If it is 0, the timing of sampling the received light signal is reached, so the non-light emitting flag is checked (S202), and the non-light emitting flag is 1 this time. Therefore, first, the next sampling period 31.25 ms is set to Ts (S206), and then the counter C that counts the number of times of sampling without performing projection is checked (S207). Therefore, the reflected light is received by the light receiving unit 12 without performing the sensor light projection, the signal is stored in X0 as analog signal data by the amplifying unit 13 (S205), and the sensor light projecting / receiving process is terminated.

  Subsequently, the statistical value calculation processing routine (S2) shown in FIG. 15 is executed. First, when the non-light emitting flag is checked, it is 1 (S301), so that the counter C is incremented by 1 (S306), and then it is checked whether the counter C is even or odd (S307). Here, since C is 1, X0 stored earlier is substituted into Y0 (S308). Then, the counter C is checked (S309), and if it is less than 15, the previous 6 sampling data Y6 is sequentially substituted into the previous 7 sampling data Y7, Y5 is replaced with Y6, and finally the latest sampling data Y0. Is substituted into the previous sampling data Y1 (S312), and this process is terminated.

  Then, the human body presence / absence determination processing routine (S4) shown in FIG. 16 is executed again. First, if the current state is checked to see if there is a human body, then there is no human body (S101). Next, if the non-light projection flag is checked to be 1 (S109), if the counter C is checked whether it is even or odd, C Is 1 (S121), it is further checked whether or not the counter C is 0 (S122). However, since C is 1, the process is terminated.

  Thereafter, when the sensor light projecting / receiving process shown in FIG. 14 is executed again, first, it waits for the sampling timer Ts to become 0 (S201), and when the non-light emitting flag is checked, the non-light emitting flag is also 1 this time. (S202) The next sampling period 31.25 ms is set to Ts (S206), and the counter C is checked (S207). Since C is 1 and odd this time, the light is projected from the light projecting unit 11 (S204). The reflected signal is received by the light receiving unit 12, and the signal is stored in X0 as analog signal data by the amplifying unit 13 (S205), and the sensor light projecting / receiving process is terminated.

  Subsequently, when the statistical value calculation processing routine (S2) shown in FIG. 15 is executed, if the non-light projection flag is checked, it is also 1 this time (S301), and the counter C is incremented by 1 (S306). Whether the counter C is even or odd is checked (S307). Since C is 2 here, the average of the eight most recent reflected signal levels X0 to X7 sampled by the sensor light projecting / receiving process routine is calculated and substituted into the average value 1 (S303). Next, the last eight reflection signal level variances are calculated and substituted for variance 1 (S304). Then, the process of substituting the reflected signal level data X6 sampled six times before into the reflected signal level data X7 sampled seven times ago, and similarly substituting the data X5 sampled five times before into X6. The latest sampling data X0 is repeatedly substituted into the previous sampling data X1 (S305), and the statistical value calculation process is terminated.

  When the human body presence / absence determination routine (S4) shown in FIG. 16 is executed again, it is first checked if the current state is the presence of a human body (S101), and then the non-light projection flag is set. Since it is 1 when checked (S109), it is checked whether the counter C is even or odd (S121). Since C is 2 this time, the process of determining the presence or absence of the human body by comparing the average value 1 obtained in the statistical value calculation processing routine (S2) with the reference level obtained in the reference level setting processing routine (S3). Is performed (S110). When the average value 1 is 8 or more higher than the reference level, it is determined that a human hand has been put in the ball, and the non-light-projecting flag is cleared to 0 (S117), and when performing normal light-projecting and sampling 62.5 ms is set in the sampling timer Ts (S118), and the process of sampling without performing projection is terminated. Then, it is determined that there is a human body (S119), and the counter B for checking whether or not the state where the variance 1 is large is cleared to 0 (S120), and the human body presence / absence determination processing is ended. If the average value 1 is not larger than 8 with respect to the reference level (S110), then the process of checking the variance 1 obtained in the statistical value calculation processing routine (S2) is executed (S111). Regardless of the size of 1, since the non-light projection flag is already 1, and the sampling timer Ts is already set to 31.25 ms, the sampling process is continued without performing light projection.

  Then, after these processes are repeated and the process of sampling without performing the light projection is performed eight times, when the statistical value calculation process routine shown in FIG. (S301), then the counter C is incremented (S306). When the counter C is checked, since this time is an odd number of 15 (S307), after substituting X0 into Y0 (S308), the counter Since C is 15 (S309), the average of the data Y0 to Y7 sampled without light projection is calculated and substituted into the average value 2 (S310). Then, the counter C is cleared to 0 (S311), and the process ends.

  When the human body presence / absence determination processing routine (S4) shown in FIG. 16 is executed again, it is first checked that the current state is no human body (S101), and that the non-light projection flag is 1 ( S109). Next, when the counter C is checked, it is 0 (S121, S122), and therefore the non-projection flag is cleared to 0 (S123) because sampling is completed without light projection (S123), and sampling is performed without light projection. The average value 2 obtained from the obtained data is checked (S124). If the average value 2 is less than 8, the amount of infrared rays emitted from the fluorescent lamp is small, and the above-mentioned dispersion value 1 is large because the hand of the person has been pushed out. It detects (S119), and clears the counter B that checks whether or not the state of large dispersion has continued (S120). On the other hand, if the average value 2 is 8 or more, it is determined that the amount of infrared rays emitted from the fluorescent lamp is irradiated on the sensor 11 and therefore the dispersion value 1 has increased. (S120).

  By controlling according to the above description, the reflected signal level and each statistical value change as shown in FIG. 9, and the fluorescent lamp in the room is turned on and emitted from the fluorescent lamp without a human hand being pushed out. When the reflected infrared light enters the sensor 10 and the timing at which the sensor 10 samples the reflected signal overlap, the reflected signal level increases, and when the next sampling is performed, the amount of infrared light emitted from the fluorescent lamp is small and the reflected signal level is low. When the state of small is repeated and the state where the variance is 4 or more continues, the operation of sampling the reflected signal level without performing light projection and the operation of performing light sampling and sampling are alternately repeated without performing light projection. Since the average value 2 obtained by sampling is 8 or more, the absence of a human body is detected, and the automatic faucet discharges water without anybody Not raw.

  In addition, when a human hand is presented in the state where no human body continues and the average value 1 of the reflected signal level does not increase by 8 or more with respect to the reference level, the variance 1 becomes 4 or more. Similarly, the operation of sampling without performing light projection and the operation of performing light sampling and sampling are repeated, and the average value 2 obtained by sampling the reflected signal level without performing light projection is only about 4 and less than 8. Therefore, it is determined that the variance 1 is increased due to the movement of the human hand, the presence of a human body is detected, and the electromagnetic valve 7 is opened to discharge water. Once the presence of the human body is detected, the determination criterion for the presence of the human body changes to whether the average value 1 is 4 or more larger than the reference level or the variance 1 is 4 or more. Without detecting the average value 2, the presence of a human body is continuously detected. After that, the user's hand is actually gone, the average value 1 is the same as the reference level, and when the variance 1 is less than 4, no human body is detected. Water is stopped.

  In the embodiment described with reference to FIG. 14, FIG. 15 and FIG. 16, the average value 2 is obtained from the reflected signal level data sampled without light projection, and the sensor emits infrared rays emitted from the fluorescent lamp based on the result. In this embodiment, dispersion is obtained from sampled reflected signal level data without performing projection, and the presence or absence of the influence of infrared rays emitted from the fluorescent lamp is confirmed based on the result. Are shown in FIGS. In FIG. 17, after repeating the operation of sampling the reflected light level without performing light projection and the operation of performing light projection and sampling the reflected signal level, Y0 is sampled when eight reflected light levels not to be projected are sampled. The variance of .about.Y7 is calculated and the value is substituted for variance 2 (S310). In FIG. 18, if the variance 2 is less than 4, the presence of a human body is detected, and if the variance 2 is 4 or more, the absence of a human body is continued (S124).

  By controlling according to FIG. 17 and FIG. 18, the reflected signal level and each statistical value change as shown in FIG. 13, and the state where the average value of the reflected signal level is relatively small and the dispersion is large is emitted from the fluorescent lamp. It is determined whether the infrared ray is emitted from the sensor or due to the movement of the human hand, and the phenomenon that the automatic water faucet discharges water without a person does not occur.

The block diagram of the automatic water tap apparatus in this invention. The block diagram of the reflection type active sensor in this invention. The control flowchart of the automatic water tap apparatus in this invention. The flowchart of the human body presence determination process in this invention. The time chart showing the reflected signal level and each statistical value of the sensor in this invention. The flowchart of the sensor light projection / reception process in this invention. The flowchart of the statistical value calculation process in this invention. The flowchart of the human body presence determination process in this invention. The time chart showing the reflected signal level and each statistical value of the sensor in this invention. The flowchart of the sensor light projection / reception process in this invention. The flowchart of the statistical value calculation process in this invention. The flowchart of the human body presence determination process in this invention. The time chart showing the reflected signal level and each statistical value of the sensor in this invention. The flowchart of the sensor light projection / reception process in this invention. The flowchart of the statistical value calculation process in this invention. The flowchart of the human body presence determination process in this invention. The flowchart of the statistical value calculation process in this invention. The flowchart of the human body presence determination process in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Automatic faucet device 2 ... Wash-stand 3 ... Bowl 4 ... Spout 5 ... Base part 6 ... Discharge water 7 ... Solenoid valve 8 ... Water source 9 ... Object detection apparatus 10 ... Optical sensor 11 ... Light projection part 12 ... Light-receiving part 13 ... Amplifying unit 14 ... calculating unit 15 ... output unit

Claims (7)

A non-contact active sensor having a light projecting unit that projects light such as infrared light, and a light receiving unit that receives light including reflected light of the light projected from the light projecting unit, and a detection signal of the light receiving unit Sampling means for periodically sampling data, first statistical calculation means for calculating an average value from a plurality of data sampled by the sampling means, and calculating a variance or standard deviation from the plurality of data A second statistical calculation means; an object presence / absence determination means for determining the presence / absence of a detection target based on outputs of the first statistical calculation means and the second statistical calculation means; and In a human body detection device comprising a determination result storage means for storing a determination result, the calculation result of the data of the first statistical calculation means is less than a predetermined threshold, and the second statistical calculation means When serial operation result data is a predetermined value or more, the human body detecting device, characterized in that the determination result stored in the determination result storage means the object presence determination means continues. A non-contact active sensor having a light projecting unit that projects light such as infrared light, and a light receiving unit that receives light including reflected light of the light projected from the light projecting unit, and a detection signal of the light receiving unit Sampling means for periodically sampling data, first statistical calculation means for calculating an average value from a plurality of data sampled by the sampling means, and calculating a variance or standard deviation from the plurality of data A second statistical calculation means, an object presence / absence determination means for determining the presence / absence of a detection object based on the outputs of the first statistical calculation means and the second statistical calculation means, and the first statistical calculation means When the calculation result of the data is less than a predetermined threshold and the calculation result of the data of the second statistical calculation means is a predetermined value or more, the non-contact active sensor does not project light from the light projecting unit. Third statistical calculation means for sampling the detection signal data of the light receiving unit by the sampling means, and calculating at least one kind of statistical value from a plurality of data sampled without performing the light projection; In the human body detection apparatus provided with the second object presence / absence determination means for determining the presence / absence of the detection object based on the calculation result of the third statistical calculation means, the calculation result of the data of the third statistical calculation means is a predetermined value. At this time, the second object presence / absence determining means determines that there is no detection target, and when the calculation result of the data of the third statistical calculation means is less than a predetermined value, the second object presence / absence determination means is the detection target. A human body detection device characterized by determining that there is an object. 3. The human body detection apparatus according to claim 2, wherein when the sampling means samples the detection signal data of the light receiving unit without performing the light projection, the sampling means performs light projection and samples the detection signal data of the light receiving unit. A human body detection apparatus for sampling data of the detection signal in a short cycle. 4. The human body detection device according to claim 2, wherein the third statistical calculation means calculates with a smaller number of data than the first statistical calculation means and the second statistical calculation means. Detection device. A non-contact active sensor having a light projecting unit that projects light such as infrared light, and a light receiving unit that receives light including reflected light of the light projected from the light projecting unit, and a detection signal of the light receiving unit Sampling means for periodically sampling data, first statistical calculation means for calculating an average value from a plurality of data sampled by the sampling means, and calculating a variance or standard deviation from the plurality of data A second statistical calculation means, an object presence / absence determination means for determining the presence / absence of a detection object based on the outputs of the first statistical calculation means and the second statistical calculation means, and the first statistical calculation means When the calculation result of the data is less than a predetermined threshold and the calculation result of the data of the second statistical calculation means is a predetermined value or more, the non-contact active sensor does not project light from the light projecting unit. The operation of sampling the detection signal data of the light receiving unit by the sampling unit and the operation of performing light projection from the light projecting unit and sampling the data of the detection signal of the light receiving unit by the sampling unit are alternately performed, Third statistical calculation means for calculating at least one kind of statistical value from a plurality of data sampled without performing projection, and the presence / absence of a detection object based on the calculation result of the third statistical calculation means In the human body detection apparatus provided with the second object presence / absence determination means for determining, when the calculation result of the data of the third statistical calculation means is equal to or greater than a predetermined value, the second object presence / absence determination means determines that there is no detection object. Determining, and when the calculation result of the data of the third statistical calculation means is less than a predetermined value, the second object presence determination means determines that there is a detection target. The human body detection device that. 6. The human body detection device according to claim 2, wherein the statistical value calculated by the third statistical calculation means is at least one of an average value, a variance value, and a standard deviation. The human body detection device according to claim 1, a water supply unit that supplies water, and a control unit that controls the water supply unit based on an output of the human body detection device. Automatic faucet device.

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