JPH045598A - Human body detecting device - Google Patents

Abstract

PURPOSE:To securely prevent a human body from being misdetected owing to environmental conditions, etc., by properly selecting an output which matches an environmental change between the outputs of >=2 kinds of human body detectors and judging the detection of the human body. CONSTITUTION:When a passive infrared-ray type human body detector 7 and a light beam type human body detector 8 are provided as the human body detector and a thermometer 3 is provided as an environmental condition detecting means, a human body is detected only with the output signal of the detector 7 if the temperature data of the thermometer 3 is less than a specific value. Further, when one human body detector outputs a detection signal, the detection of the human body is discriminated speedily. Further, the human body is detected only with the output signal of the light-beam type human detector 8. When the detectors 7 and 8 output detection signals at the same time, the detection of the human body is discriminated. Further, when an illuminance detector or rainfall detector 5 is provided as an environmental change detecting means, the human body is detected only with the output signal of the passing infrared-ray type human body detector 7 on condition that illuminance data is less than specific specific value and the detection is performed in nighttime or in a rainfall state.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to, for example, detecting the presence or absence of a human body in a predetermined detection air and controlling the opening/closing of an automatic door or the operation of a security alarm device. This invention relates to a human body detection device that can be applied to switches.

<Prior Art> Various types of human body detection devices have been devised to detect a human body and to be used as a start switch to control the activation of a security alarm or lighting device or the opening/closing of an automatically opening/closing door. However, in recent years, there has been a tendency to use non-human body contact type devices, which have the advantages of a clear detection area, easy setting and modification, and a long lifespan.

This non-contact type includes a passive infrared type that uses fluctuations in the amount of radiated infrared energy based on the temperature difference between the background of the detection area and the human body, and a passive infrared type that uses infrared rays to project infrared light onto a predetermined detection area. There are light beam type devices that utilize changes in the amount of reflected light caused by the human body entering the device.

<Problems to be Solved by the Invention> However, even these non-contact types have various drawbacks. In other words, in the passive infrared type, a dust suction mantle made of cloth with a small heat capacity is placed over the detection area set in front of the automatic opening/closing door, and the surface temperature of this dust suction mantle is changed by direct sunlight. If the temperature rises rapidly and then suddenly drops because the sun goes dark or the wind blows, the fluctuation in the amount of infrared energy due to this sudden rise or fall in temperature may be detected and malfunction may occur. Furthermore, when there is almost no temperature difference between the temperature of the background of the detection area, such as the floor surface, and the human body, such as in the evening in summer, it becomes impossible to detect the human body entering the detection area.

On the other hand, the light beam type is prone to malfunction due to snow and rain in the winter, especially torrential rains and typhoons in the summer, and even light reflected from insects at night.

The present invention has been made in view of these conventional problems, and provides a human body detection device that can reliably detect a human body with almost no malfunctions regardless of various changes in the environmental conditions of the detection area. The technical challenge is to provide

<Means for Solving the Problems> In the present invention, as a technical means for achieving the above-mentioned problems, a human body detection device is configured as follows. That is, 2
human body detectors of at least one species, an environmental condition detecting means, a signal selecting means for selecting an output signal of each of the human body detectors based on the environmental condition detecting means, and determining an output signal from the signal selection signal. The present invention is characterized by comprising a control means for outputting a human body detection signal.

Further, it is preferable to provide a passive infrared type human body detector and a light beam type human body detector as the human body detector, and a thermometer as the environmental condition detection means.

Furthermore, a rain detector may be provided as the environmental condition detection means.

Furthermore, an illuminance detector may be provided as the environmental condition detection means.

<Function> When a passive infrared type human body detector and a light beam type human body detector are provided as a human body detector, and a thermometer is provided as an environmental condition detection means, the temperature data of the thermometer is set to a predetermined value, e.g.
If the temperature is below ℃, the human body is detected only by the output signal of the passive infrared human body detector.
Eliminates malfunctions of optical human body detectors due to snow.

In addition, if the temperature is determined to be within the range of 5 to 20 degrees Celsius by the thermometer, this is the most stable detection condition for any human body detector, so a detection signal is sent from any one human body detector. When this is output, it is quickly determined that a human body has been detected.

In addition, when determining that the temperature is within the range of 20 to 25 degrees Celsius, such as in the evening in summer, passive infrared type human body detectors are most likely to malfunction, so optical type human body detectors By detecting a human body using only the output signal of the infrared human body detector, malfunctions of the infrared human body detector can be eliminated.

Furthermore, when it is determined that the temperature is 25 degrees Celsius or higher, such as during the daytime in summer, each human body detector is likely to malfunction, so each human body detector outputs a detection signal at the same time. The detection of a human body is determined at the point in time.

Additionally, if an illuminance detector or a rainfall detector is provided as an environmental condition detection means, if the illuminance data is below a predetermined value and it is determined that it is night time, or if it is determined that it is raining, By detecting a human body using only the output signal of the passive infrared human body detector, it is possible to eliminate malfunctions of the optical human body detector due to insects or rain.

In this way, since the detection of a human body is determined by appropriately selecting the respective output signals of the two or more types of human body detectors that are suitable based on changes in the detected environmental conditions, malfunctions can be reliably prevented.

<Example> Hereinafter, a preferred example of the present invention will be described in detail with reference to the drawings.

In FIG. 1, which shows a block diagram of an embodiment of the present invention, a central processing unit 1 consisting of a microcomputer controls the entire device, and receives digital signals from a temperature controller 3 via an A/D converter 6. The temperature data input by converting into the ROM 2 is subjected to signal processing based on a program stored in advance in the ROM 2, and based on the processing results, A/D conversion is performed from the passive infrared type human body detector 7 and the optical beam type human body detector 8. Both signals inputted through circuits 9 and 10 are appropriately selected, the selected signals are constantly monitored, and when a set condition is satisfied, a human body detection signal is output. This human body detection signal is D/
After being converted into an analog signal by the A converter 11, it is output to an output circuit 12 which outputs an opening signal for an automatically opening/closing door, an activation signal for a security alarm device, or a lighting device.

Passive infrared human body detector 7 and optical human body detector 8
Both have the same configuration as existing ones. That is, the passive infrared human body detector 7 has an optical system (not shown).
an infrared detection element 7a that converts the amount of infrared energy from a predetermined detection area that is focused and incident into an electrical signal proportional to the fluctuation thereof; and an amplifier circuit 7b that amplifies the electrical signal from this infrared detection element 7a. , and a level detection circuit 7C that constantly monitors fluctuations in the amplified signal and outputs a detection signal when a fluctuation exceeding the set detection sensitivity is detected.

In the optical human body detector 8, the drive circuit 8b drives the light emitter 8C to emit light based on the output synchronization signal of the oscillator 8a, and the light emitter 8C projects a light beam made of pulse modulated light onto the detection area. The reflected light from the background or the human body in the detection area of the projected light beam is received by the light receiver 8d and photoelectrically converted, and this electric signal is amplified by the amplifier circuit 8e. The light is allowed to pass through the synchronization circuit 8f in synchronization with the light emission time of , and is input to the comparison circuit 8g. This comparison circuit 8g compares the input signal level with the detection level and outputs a detection signal when the input signal level is equal to or higher than the detection level.

Furthermore, in addition to the thermometer 3, an illuminance detector 4 and a rainfall detector 5, which are shown by phantom lines, may be provided as environmental condition detection means.

Next, the operation when the illuminance detector 4 and the rain detector 5 are added to the above embodiment will be explained with reference to the flowchart of FIG. 2. In the figure, the passive infrared human body detector 7 is abbreviated as A, and the optical human body detector 8 is abbreviated as B. The central processing unit 1 first determines whether the ambient illuminance is 1001 ux or less from the illuminance data from the illuminance meter 4 (step Sl). This determines whether it is nighttime or not, and if the ambient illuminance is less than 100IIJX and it is determined that it is nighttime, the infrared human body detector 7
This is because the optical human body detector 8 is likely to malfunction due to insects, so only the infrared detector 7 is used to detect human bodies throughout the year at night when insects are present. If the infrared human body detector 7 does not output a detection signal, the process jumps to step S1 and repeats the same operation, and when the detection signal is output, the central processing unit 1 outputs the signal through the D/A conversion circuit 11. A human body detection signal is output to 12 (step 511).
.

On the other hand, if the ambient illuminance is 1001 ux or more, it is determined from the temperature data from the thermometer 3 whether the air temperature is 5° C. or less (step S2). This mainly determines whether it is winter or not, and if the temperature is below 5°C and it is determined that it is winter, only the output of the infrared human body detector 7 is monitored as described above. (step 510),
When the infrared human body detector 7 outputs a detection signal, the central processing unit 1 outputs a human body detection signal to the output circuit 12 (step 511). This is because the optical human body detector 8 is likely to malfunction due to snow, so in winter, only the infrared human body detector 7 is used to detect a human body. However, it goes without saying that it does not necessarily follow the calendar; it is longer in cold regions and shorter in warm regions.Also, even in winter, on warm days of 5 degrees Celsius or higher, proceed to step 83 and below to detect a human body by other means. I do.

If the temperature is 5 degrees Celsius or higher, the rain detector 5
It is determined whether or not it is raining based on the data from (step S3). If it is determined that it is raining, only the output of the infrared human body detector 7 is monitored since the optical human body detector 8 is likely to malfunction due to rain.

If it is determined that the weather is clear or cloudy, it is determined again from the illuminance data whether the ambient illuminance is 20001 u x or less (step S4). Illuminance is 100~20001
Since the temperature at ux is 5°C or higher and the environment is stable with no rain, it is determined whether a detection signal is output from either of the human body detectors 7 and 8 (step S7). , a human body detection signal is output from the central processing unit 1 to the output circuit 12 when a detection signal is output from either one (step 511).

On the other hand, if it is determined that the weather is sunny and the ambient illuminance is 20001 u x or more, it is determined from the temperature data whether the air temperature is 20° C. or less (step S5).

If YES is determined here, the ambient illuminance is set to 200.
01 u At step 37), when a detection signal is output from either one, the central processing unit 1
outputs a human body detection signal to the output circuit 12 (step 511).

If it is determined that the air temperature is 20° C. or higher, it is determined again from the temperature data whether the air temperature is 25° C. or lower (step S6). If YES is determined here, it is an environmental condition where the passive infrared human body detector 7 is likely to malfunction, such as when the temperature is 20°C to 25°C and there is no rain, such as in the evening in summer. Only the output of the optical human body detector 8 is monitored (step S8), and when a detection signal is output from the optical human body detector 8, the central processing unit 1 outputs a human body detection signal to the output circuit 12 ( Step 5
11).

Also, during the daytime when it is not raining in summer, the temperature is 25
If it is determined that the temperature is above ℃, this is the most unstable environmental condition in which both human body detectors 7.8 are likely to malfunction, so the outputs of both human body detectors 7.8 are monitored together ( In step S9), a human body detection signal is output from the central processing unit 1 to the output circuit 12 only when detection signals are output from both human body detectors 7.8 at the same time.

In this way, since the appropriate one of the output signals of the two types of human body detectors 7.8 is appropriately selected and determined based on the detected change in the environmental conditions, malfunctions can be reliably prevented. The above explanation can be summarized in a table as follows.

However, if the illuminance detector 4 and the rain detector 5 are not provided, the judgment flow of step s1 and step s3 in FIG. Similarly, this thermometer 3 alone can almost prevent malfunctions. Also, step S
If YES is determined in step 2, the process may jump to step S9. If you do this, the temperature will be 5℃
In the following cases, it is almost impossible for the passive infrared type human body detector 7 to malfunction, so there is an advantage that the human body detector 7 can be set to be highly sensitive in winter.

Note that the present invention is not limited only to the contents of the above description and drawings, and may include various modifications without departing from the scope of the claims. For example, in the embodiment described above, a passive infrared type and a light beam type human body detector are used, but an ultrasonic type or a radio wave type can also be used. Further, a humidity needle, a clock, etc. may be used as the environmental condition detection means, or the environmental conditions may be set manually.

<Effects of the Invention> As described above, according to the human body detection device of the present invention, detection of a human body can be determined by appropriately selecting outputs from two or more types of human body detectors that are compatible with changes in environmental conditions. Therefore, erroneous detection of a human body due to environmental conditions etc. can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a flow chart of FIG. 1...Central processing unit (control means) 3...Thermometer 4...Illuminance detector 5...Rainfall detector 7...Passive infrared type human body detector 8...Light beam type human body detection Device 2...Output circuit patent applicant Optex Co., Ltd.

Claims (5)

[Claims] (1) Two or more types of human body detectors, environmental condition detection means,
A signal selection means for selecting an output signal of each of the human body detectors based on the environmental condition detection means, and a control means for determining an output signal from the signal selection signal and outputting a human body detection signal. A human body detection device featuring: (2) Claim (1) characterized in that the human body detector includes a passive infrared type human body detector and a light beam type human body detector.
) Human body detection device described in ). (3) The human body detection device according to claim (1), further comprising a thermometer as the environmental condition detection means. (4) The human body detection device according to claim (1), further comprising a rain detector as the environmental condition detection means. (5) The human body detection device according to claim (1), further comprising an illuminance detector as the environmental condition detection means.