JP2637833B2 - Human body detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention is directed to, for example, detecting the presence or absence of a human body in a predetermined detection area and controlling the opening and closing of an automatic door and the operation of a security alarm device. The present invention relates to a human body detection device suitable for a switch.

<Prior Art> Various types of human body detection devices have been devised for use as a start switch for detecting the human body and controlling the operation of a security alarm device or a lighting device and the opening / closing of an automatic opening / closing door. In recent years, there has been a tendency to use a non-human body type which has an advantage that the detection area is clear, the setting and the change thereof are easy, and the service life is long.

As the non-contact type, a passive infrared type that uses a variation in the amount of radiated infrared energy based on a temperature difference between the background of the detection area and the human body, and projects infrared rays onto a predetermined detection area to project the infrared rays onto the detection area. There is a light beam type that utilizes a change in the amount of reflected light due to the entry of a human body.

<Problems to be Solved by the Invention> However, even these non-human body types have various disadvantages. That is, in the passive infrared type, a dust-absorbing mat using a cloth material having a small heat capacity is laid on a detection area set in front of the automatic opening / closing door, and the surface temperature of the dust-absorbing mat is rapidly increased by direct sunlight. When the temperature rises and the temperature suddenly drops due to shading or wind blowing at this time, a malfunction in the amount of infrared energy due to the sudden rise or fall in temperature may be detected. Further, when the temperature difference between the temperature of the floor surface or the like in the background of the detection area and the human body almost disappears in the summer evening or the like, the human body entering the detection area cannot be detected.

On the other hand, the light beam type is liable to malfunction due to snow and rain in winter, particularly concentrated torrential rain and typhoons in summer, and reflected light from insects at night.

The present invention has been made in view of such a conventional problem, and provides a human body detection device capable of reliably detecting a human body with almost no malfunction regardless of various changes in environmental conditions in a detection area. Is a technical task.

<Means for Solving the Problems> In the present invention, as a technical means for achieving the above-described problems, a human body detection device is configured as follows. That is,
The human body detection device according to the present invention includes two or more types of passive infrared type, light type, ultrasonic type and radio wave type human body detectors, environmental condition detecting means, and detection of the environmental condition. Based on the result, using one or more selecting means for selecting one or more of the two or more types of human body detectors according to a predetermined criterion, and using an output signal from the human body detector selected by the selecting means. And a control means for generating a human body detection signal to be output to the outside.

Here, in the present invention, it is preferable that at least two types of the human body detectors include at least a passive infrared human body detector and a light ray human body detector among the human body detectors of the above-mentioned respective systems.

Further, the environmental condition detecting means used in the present invention can be one or more of a thermometer, a rainfall detector, and an illuminance detector. When a plurality of environmental condition detectors are provided, the selecting means may be used. In the above, it is preferable to select the human body detector based on a combination of the respective environmental condition detection results by the plurality of detection means.

<Operation> When a passive infrared human body detector and a light ray human body detector are provided as the human body detector and a thermometer is provided as the environmental condition detecting means, the temperature data of the thermometer is a predetermined value, for example, 5 ° C. or less. In the case of, the human body is detected only by the output signal of the passive infrared human body detector, so that the malfunction of the publicly selectable human body detector due to snow can be eliminated.

When it is determined by the thermometer that the air temperature is within the range of 5 to 20 ° C., the detection condition is the most stable in any of the human body detectors. When the is output, it is quickly determined that a human body is detected.

Also, when it is determined that the temperature is within the range of 20 to 25 ° C, such as in the evening in summer, the passive infrared human body detector is in a state where malfunction is most likely to occur. By detecting the human body only by the output signal of, the malfunction of the infrared human body detector can be eliminated.

Furthermore, when it is determined that the temperature is 25 ° C. or higher as in the daytime in summer, since it is in a state where any human body detectors are liable to malfunction, a detection signal is output from each human body detector at the same time. At this point, the detection of the human body is determined.

Also, if an illuminance detector or a rainfall detector is provided as the environmental condition detecting means, if the illuminance data is equal to or less than a predetermined value and it is determined that it is nighttime, or if it is determined that it is in a rainy state By detecting the human body only by the output signal of the passive infrared human body detector, malfunction of the light human body detector due to insects or rain can be eliminated.

As described above, the detection of the human body is determined by appropriately selecting each output signal of a suitable one of the two or more types of human body detectors based on the detected change in the environmental condition, so that malfunction can be reliably prevented.

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

FIG. 1 is a block diagram showing an embodiment of the present invention.
Is used to control the entire apparatus, converts temperature data input from the thermometer 3 into digital signals via the A / D converter 6 based on a program stored in the ROM 2 in advance, and performs signal processing. According to the results, the passive infrared human body detector 7 and the light ray human body detector 8 respectively output A / D conversion circuits 9 and 1
Both signals input via 0 are appropriately selected, and the selected signals are constantly monitored to output a human body detection signal when a set condition is satisfied. This human body detection signal is converted into an analog signal by the D / A converter 11, and then output to an output circuit 12 that outputs an automatic opening / closing door opening signal or an operation signal of a security alarm device or a lighting device.

Each of the passive infrared human body detector 7 and the light beam human body detector 8 has the same configuration as the existing one. That is, the passive infrared type human body detector 7 is an infrared detection element that converts the amount of infrared energy from a predetermined detection area which is condensed and incident by an optical system (not shown) into an electric signal proportional to the change thereof. 7a, an amplifier circuit 7b that amplifies the electric signal from the infrared detection element 7a, and a level detection circuit 7c that constantly monitors the fluctuation of the amplified signal and outputs a detection signal when a fluctuation exceeding the set detection sensitivity is detected. It consists of.

Further, in the light beam type 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,
The light emitter 8c projects a light beam composed of pulse-modulated light onto the detection area, receives light reflected from the background of the light detection area or from the human body by the light receiver 8d, performs photoelectric conversion, and converts this electric signal. The amplified signal is amplified by the amplifier circuit 8e, and the amplified signal is allowed to pass through the synchronization circuit 8f in synchronization with the light emission time of the projector 8c by the synchronization signal of the oscillator 8a, and is input to the comparison circuit 8g. The comparison circuit 8g compares the input signal level with the detection level and outputs a detection signal when the input signal level is higher than the detection level.

Further, in addition to the thermometer 3, an illuminance detector 4 and a rainfall detector 5 indicated by virtual lines can be additionally provided as environmental condition detecting means.

Next, the illuminance detector 4 and the rainfall detector 5
The operation in the case where is attached will be described with reference to the flowchart of FIG. In FIG. 1, the passive infrared human body detector 7 is abbreviated as A, and the light beam type human body detector 8 is abbreviated as B. The central processing unit 1 first determines from the illuminance data from the illuminometer 4 whether or not the ambient illuminance is 100 lux or less (step S1). This is to determine whether it is nighttime or not. If the ambient illuminance is less than 10 lux and it is determined that it is nighttime, only the output of the infrared human body detector 7 is monitored (step S10). This is a light beam type human body detector 8
Insects are liable to malfunction due to insects, so that at night when insects appear, the human body is detected only by the infrared detector 7 throughout the year. If no detection signal is output from the infrared human body detector 7, the process jumps to step S1 and repeats the same operation.
The human body detection signal is output to the output circuit 12 through the A conversion circuit 11 (Step S11).

On the other hand, if the ambient illuminance is 100 lux 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 is mainly to determine whether it is winter or not. If it is determined that the temperature is 5 ° C or less and it is winter, only the output of the infrared human body detector 7 is monitored in the same manner as described above. Then, when the detection signal is output from the infrared human body detector 7 (step S10), the central processing unit 1 outputs a human body detection signal to the output circuit 12 (step S11). Since the light-type human body detector 8 easily malfunctions due to snow, the human body is detected only by the infrared human body detector 7 in winter. However, it is not always according to the calendar, it is needless to say that it is longer in cold regions and shorter in warm regions, and even in winter, on warm days of 5 ° C or more, proceed to step S3 or less and detect human bodies by other means. I do.

If the temperature is equal to or higher than 5 ° C., it is determined whether or not it is raining based on the data from the rain detector 5 (step S3). If it is determined that it is raining, the light beam type human body detector 8 is likely to malfunction due to rain, so that only the output of the infrared type human body detector 7 is monitored.

If it is determined that the weather is fine or cloudy, it is determined again from the illuminance data whether or not the ambient illuminance is 2000 lux or less (step S4). Is 100-2000lux and the temperature is more than 5 degrees,
Moreover, since it is a stable environmental condition without raining,
It is determined whether or not a detection signal has been output from one of the two human body detectors 7 and 8 (step S7). When the detection signal has been output from either one of the two human body detectors 7, the output circuit 12 is output from the central processing unit 1.
Then, a human body detection signal is output (step S11).

On the other hand, when it is determined that the ambient illuminance is equal to or higher than 2000 lux on a sunny day, it is determined from the temperature data whether the air temperature is equal to or lower than 20 degrees (step S5). If YES is determined here, even if the ambient illuminance is 2000 lux or more, the temperature is 5 ° C to 20 ° C and the environment is stable with no rain. Detector 7, 8
It is determined whether a detection signal has been output from any one of the above (step S7), and at the time the detection signal has been output from either one, the central processing unit 1 outputs a human body detection signal to the output circuit 12 ( Step S11).

When it is determined that the air temperature is abnormal at 20 ° C., it is determined again from the temperature data whether the air temperature is 25 ° C. or less (step S6). If YES is determined here, since the temperature is 20 ° C. to 25 ° C. and the rain is not falling, for example, in the evening in summer, etc., and the passive infrared human body detector 7 is in an environmental condition in which it is likely to malfunction, Only the output of the light beam type human body detector 8 is monitored (step S8), and when a detection signal is output from the light beam type human body detector 8, the central processing unit 1 outputs a human body detection signal to the output circuit 12 (step S8). Step S11).

In addition, the temperature is 25
If it is determined that the temperature is above ℃,
7, 8 are also the most unstable environmental conditions that are likely to malfunction, so
Monitor the outputs of both human body detectors 7 and 8 together (step S
9), the central processing unit 1 outputs a human body detection signal to the output circuit 12 only when the detection signals are simultaneously output from the two human body detectors 7 and 8.

As described above, the appropriate one of the output signals of the two types of human body detectors 7 and 8 is appropriately selected and determined based on the detected change in the environmental condition, so that malfunction can be reliably prevented. The above description is summarized in the following table.

However, when the illuminance detector 4 and the rainfall detector 5 are not provided, there is no step S1 and step S3 in FIG.
The other operations are the same except for the operation described above, and malfunction can be substantially prevented by using the thermometer 3 alone. YES in step S2
If it is determined, the process may jump to step S9. In this case, when the temperature is 5 ° C. or less, the passive infrared human body detector 7 is almost invariably malfunctioning, so that there is an advantage that the human body detector 7 can be set with high sensitivity in winter. .

It should be noted that the present invention is not limited only to the above description and the contents of the drawings, and may include various modifications without departing from the scope of the claims. For example, in the above-described embodiment, the case where the passive infrared type and the light type are used as the human body detector has been described. However, an ultrasonic type or a radio wave type may be used. Further, a hygrometer, a clock, or the like may be used as the environmental condition detecting 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, the detection of the human body is determined by appropriately selecting one of the outputs of the two or more types of human body detectors that matches the change in the environmental condition. Therefore, erroneous detection of a human body due to environmental conditions or the like can be reliably prevented.

[Brief description of the drawings]

 FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a flowchart of FIG. 1 central processing unit (control means) 3 thermometer 4 illuminance detector 5 rainfall detector 7 passive infrared human body detector 8 light beam human body detector 12 output circuit

Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H03K 17/945 G01V 9/04 M (72) Inventor Isamu 4-7-5 Inonohama, Otsu-shi, Shiga OPTEX Inside (72) Inventor Yasuo Shoji 4-75 Nonihama, Otsu, Shiga Prefecture Inside Optex Co., Ltd. (72) Inventor Hiroshi Takano 4-7-5 Nonihama, Otsu City, Shiga Prefecture Inside Optex Co., Ltd. (72 ) Inventor Nobuyuki Araki 4-7-5 Nonohama, Otsu City, Shiga Prefecture Inside Optex Co., Ltd. (56) References JP-A-64-7198 (JP, A) Japanese Utility Model Application Sho-59-23880 (JP, U)

Claims (6)

(57) [Claims] 1. An apparatus for detecting at least two types of human body detectors of a passive infrared type, a light type, an ultrasonic type, and a radio wave type, an environmental condition detecting means, and a detection result of the environmental condition. Selecting means for selecting one or more of the two or more types of human body detectors according to a predetermined criterion, and using an output signal from the human body detector selected by the selecting means, externally. A human body detection device comprising control means for generating a human body detection signal to be output. 2. The human body detecting device according to claim 1, wherein the two or more kinds of human body detectors are a passive infrared human body detector and a light beam human body detector. 3. The human body detecting device according to claim 1, further comprising a thermometer as the environmental condition detecting means. 4. The human body detecting device according to claim 1, further comprising a rainfall detector as environmental condition detecting means. 5. The human body detecting device according to claim 1, further comprising an illuminance detector as environmental condition detecting means. 6. An environmental condition detecting means comprising a plurality of detecting means of a thermometer, a rainfall detector, and an illuminance detector,
The human body detection device according to claim 1, wherein the selection unit selects a human body detector based on a combination of detection results of the environmental conditions by the plurality of detection units.