JP4992419B2 - Human body detection device - Google Patents

Description

  The present invention relates to a human body detection device for detecting an infrared ray emitted from a human body and determining an area where the human body exists, and an air conditioner including the human body detection device.

  Conventionally, as this type of human body detection device, an infrared detection area of a plurality of human body detection means is overlapped and divided into areas larger than the number of human body detection means to determine the presence or absence of a human body in each area. (For example, refer to Patent Document 1).

FIG. 7A is a plan view showing an example of a detection area of a conventional human body detection device described in Patent Document 1, and FIG. 7B is a plan view showing an example of a condensing region of the detection area. . As shown in FIG. 7, by overlapping a part of the infrared detection areas of the two human body detection means with each other, the area can be divided into three and the presence or absence of a human body in each area can be determined.
Japanese Patent No. 3387206

  However, in the conventional configuration, when there is a person in the overlapping portion of the infrared detection areas of the plurality of human body detection means, if there is a shift in the light collection region in the overlapping portion of the infrared detection area of each human body detection means, Depending on the location and the size of the movement, all human body detection means that include the overlapping part in the infrared detection area cannot always detect human body reaction, and if there is a person in the non-overlapping part, there is a problem that it makes an erroneous determination Had.

  The present invention solves the above-mentioned conventional problems, and when there is a person in an overlapping part of infrared detection areas of a plurality of human body detecting means, it is possible to determine that there is a person in the overlapping part without making an erroneous determination. The purpose is to provide.

  In order to solve the above-described conventional problems, a human body detection device according to the present invention is provided with a pair of an infrared detection unit that detects infrared rays radiated from a human body and the infrared detection unit. There are provided a plurality of human body detection means having an infrared condensing unit that divides into light regions and collects infrared light from the infrared detection area, and at least two of the infrared detection areas of the human body detection means overlap each other. In addition, the condensing regions in the overlapping portion are configured to overlap each other in a shape that is substantially the same.

  Thereby, when there is a person in the overlapping portion, all human body detecting means including the overlapping portion in the infrared detection area can detect human body reactions almost simultaneously, and it can be reliably determined that there is a person in the overlapping portion.

  The human body detection device of the present invention can detect human body reaction substantially simultaneously with all the human body detection means including the overlapping part in the infrared detection area when there is a person in the overlapping part of the infrared detection area of the plurality of human body detection means. Therefore, it is possible to provide a highly accurate human body detection device without significantly changing the structure.

1st invention is provided with the infrared detection part which detects the infrared rays radiated | emitted from a human body, and the said infrared detection part, The infrared detection area is divided | segmented into a some condensing area | region, and it is from the said infrared detection area. A plurality of human body detecting means having an infrared light collecting section for collecting infrared light, a part of the infrared detection area of at least two of the human body detecting means overlaps each other, and the condensing areas in the overlapping portions are respectively When there is a person in the overlapping part of the infrared detection area of the plurality of human body detection means, the human body is detected almost simultaneously in all the human body detection means including the overlapping part in the infrared detection area. A reaction can be detected, it can be reliably determined that there is a person in the overlapped portion, and a highly accurate human body detection device can be provided without greatly changing the structure.

  The second invention determines that a human body exists in the overlapping portion of the infrared detection area, particularly when at least two human body detecting means having the overlapping portion of the first invention each react within a predetermined time, and the predetermined By providing human body detection area determination means for determining that a human body exists in a non-overlapping part of the infrared detection area when each of the reactions exceeds time, the presence / absence of a person is determined separately for the overlapping part and the non-overlapping part It is possible to determine the presence / absence of a person in a larger number of areas than the number of human body detection means, more reliably determine where the person is, and a highly accurate human body detection device without greatly changing the structure. Can be provided.

  According to a third aspect of the invention, in particular, at least two human body detection means having overlapping portions of the first or second aspect of the invention are configured such that the condensing regions of the non-overlapping portions of the infrared detection area have different condensing distances. Therefore, it is possible to detect the presence or absence of a human body by dividing into a plurality of areas with different distances, and it is possible to determine the presence or absence of a person in an area having a larger number of distances than the number of human body detection means, and the distance to the location of the person Can be reliably determined.

  In the fourth aspect of the invention, in particular, at least two human body detecting means having overlapping portions of the third aspect of the invention are configured so that the horizontal light collecting directions are equal to each other, so that the respective light collecting regions in the overlapping portions substantially coincide with each other. It is easy to arrange so as to overlap each other in shape, and it can be determined more reliably if there is a person in the overlapping portion.

  According to a fifth aspect of the invention, in particular, the at least two human body detection means having overlapping portions of the first or second aspect of the invention have a configuration in which the condensing regions of the non-overlapping portions of the infrared detection area have different horizontal condensing directions. Thus, it is possible to detect the presence / absence of a human body by dividing it into a plurality of areas having different horizontal directions, and to determine the presence / absence of a person in a different number of horizontal directions than the number of human body detection means. It is possible to reliably determine the direction in which it is present.

  In the sixth aspect of the invention, in particular, at least two human body detecting means having overlapping portions of the fifth aspect have a condensing distance equal to each other, so that the respective condensing regions in the overlapping portions substantially coincide with each other. It is easy to arrange so as to overlap each other, and it can be determined more reliably if there is a person in the overlapping portion.

  According to the seventh aspect of the invention, in particular, depending on the presence or absence of the human body detected by the human body detection device of the first to sixth aspects of the invention, the air heat-exchanged by the heat exchanger is controlled by the blower and blown indoors. It is an air conditioner provided with a human body detection device, and desired air conditioning control can be reliably performed by detecting the presence or absence of a human body with higher accuracy.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 to 4 are views showing a first embodiment of the present invention. FIG. 1A is a plan view and FIG. 2B is a side view of a condensing region of two pairs of infrared detection areas of the human body detection device according to the first embodiment of the present invention, and FIG. FIG. 3 is a front view of an infrared ray condensing unit of the human body detection device according to the first embodiment of the present invention, and FIG. 4 is a first view of the present invention. The (a) top view and (b) side view of the condensing area | region of a pair of infrared detection area of the human body detection apparatus in embodiment are shown.

  In FIG. 2, the human body detection means 1 is composed of a pyroelectric element, a thermopile element, and the like, and detects an infrared amount difference emitted from the human body and converts it into an electrical signal, and a plurality of partial detection areas. And is arranged in a pair with the infrared detection unit 2, and is composed of an infrared light collection unit 3 such as a Fresnel lens that focuses on the infrared detection unit 2 and collects infrared rays. The effective detection area 5 of the infrared rays to light is shown. The electrical signal output detected by the human body detection means 1 is band-amplified by the amplifier 6 and processed by the infrared processing means 7 and the human body detection area determination means 4 to determine the presence or absence of a human body in the infrared detection area.

  Further, a combination of the human body detection means 1, the effective detection area 5, the amplifier 6 and the infrared processing means 7 composed of the infrared detection unit 2 and the infrared light collection unit 3 is set as a pair, and a total of three sets. The entire structure is configured, and sub-symbols A to C are attached to each set. For example, as shown in FIG. 2, each effective detection area is represented as 5A, 5B, 5C. The human body detection area determination means 4 receives the output from each of the infrared processing means 7A, 7B, and 7C, and compares the output with a preset determination criterion to specify a human body existing area.

  FIG. 3 is a front view of each of the infrared condensing units 3A, 3B, 3C made of a Fresnel lens that divides a predetermined area into a plurality of partial detection areas. Here, the infrared condensing unit 3B will be described as an example. The infrared condensing unit 3B is composed of lenses 3B1 to 3B18 divided in 18 directions in 2 vertical directions. The divided condensing lenses 3B1 to 3B18 divide a predetermined area into condensing areas 5B1 to 5B18 shown in FIG. As a result, the infrared detection unit 2B receives infrared signals collected from the respective light collection regions 5B1 to 5B18 divided into 18 in total in the light collection distance direction.

  FIG. 4 shows (a) a plan view and (b) a side view of the effective detection area 5B obtained by the infrared condensing unit 3B, and shows the respective condensing regions 5B1 to 5B18 corresponding to the condensing lenses 3B1 to 3B18. The other infrared condensing units 3A and 3C have condensing regions 5A1 to 5A27 and 5C1 to 5C18 corresponding to the effective detection areas 5A and 5C.

  As shown in FIG. 4, when the effective detection area 5B is divided into discontinuous light collection areas 5B1 to 5B18 which are separated, when a person moves in the detection area 5B, the infrared amount of each light collection area in the vicinity thereof. Changes, and the presence or absence of a human body can be detected by detecting the amount of change. In the present embodiment, the arc length outside the detection area 5B is about 6.5 m, and the arc length outside each of the farthest condensing regions 5B1 to 5B12 is about 30 cm. The presence or absence of the human body is accurate even when an air conditioner equipped with a human body detection device is installed in a room of about 23 tatami mats, with a size that can be detected in any of the condensing areas 5B1 to 5B18. It is possible to detect no.

  1A is a plan view and FIG. 1B is a side view showing a condensing region in each of the detection areas of the two human body detection means 1A and 1B (the plan view is a cross section of XX ′, the side view is YY 'cross section).

  The effective detection area 5A of the first human body detecting means 1A detects the presence or absence of a human body in the detection area a farthest from the sensor and the detection area b of the intermediate distance, and the effective detection area of the second human body detecting means 1B. In the area 5B, an effective detection area is arranged so as to detect the presence or absence of a human body in the detection area c closest to the sensor and the detection area b having an intermediate distance.

On the other hand, if the direction in which infrared rays are incident at right angles to the light receiving surfaces of the infrared detectors 2A and 2B of the human body detection means 1A and 1B is the light collection direction of the human body detection means, the light collection of the human body detection means 1A and 1B. Since the detection areas 5A and 5B are divided symmetrically in this embodiment, the center lines of the effective detection areas 5A and 5B of the human body detection means 1A and 1B become the horizontal light collection direction. It overlaps with the YY ′ line in FIG.

  In other words, the infrared detection areas a and c of the non-overlapping portions of the first human body detection unit 1A and the second human body detection unit 1B are arranged such that the light collection distances are different from each other and the horizontal light collection directions are equal to each other. It arrange | positions so that it may mutually overlap in the area b.

  Further, each of the detection areas 5A and 5B is composed of a plurality of light collection regions, and each collection of the first human body detection means 1A and the second human body detection means 1B in the detection area b at an intermediate distance which is an overlapping portion. Light distribution is performed so that the light regions overlap with each other in a substantially coincident shape.

  In the present embodiment, the detection area 5A is divided into 27 condensing areas 5A1 to 5A27, and the detection area 5B is divided into 18 divided into 5B1 to 5B18. The light condensing regions 5A16 to 5A27 and 5B1 to 5B12 are distributed so as to overlap each other in a substantially coincident shape.

  Thereby, when a person moves in the detection area b which is an overlapping part, the first human body detecting means 1A and the second human body detecting means 1B which include the overlapping part b as a part of the detection areas are detected substantially simultaneously. be able to. For example, when the first human body detecting means 1A detects the presence or absence of a human body in the light condensing area 5A20 with the infrared light condensing unit 3A20, the second human body detecting means 1B has a shape substantially coincident with the light condensing area 5A20. The presence or absence of a human body can be detected by the infrared condensing unit 3B5 corresponding to the overlapping condensing region 5B5. Therefore, the human body detection area determination unit 4 is based on the output information of the human body detection reaction of the first human body detection unit 1A and the second human body detection unit 1B, and the first human body detection unit 1A and the second human body detection unit. When 1B reacts within a predetermined time, it is determined that a human body exists in the detection area b at the intermediate distance of the overlapping portion.

  On the other hand, when it reacts over the said predetermined time, it determines with a human body existing in both the long-distance detection area a and the short-distance detection area c of a non-overlapping part. For example, when there is a reaction between the infrared condensing part 3A3 of the first human body detecting means 1A corresponding to the condensing area 5A3 and the infrared condensing part 3B15 of the second human body detecting means 1B corresponding to the condensing area 5B15 In addition, the human body detection area determination unit 4 determines the human body existence area from the human body detection reaction of the first human body detection unit 1A and the second human body detection unit 1B, but there is a possibility that a plurality of people move almost simultaneously. Therefore, when the detection reaction by the first human body detection unit 1A and the second human body detection unit 1B has occurred over a predetermined time, it is determined that the location is different from each other. It is determined that a human body exists in both the long-distance detection area a and the short-distance detection area c.

  Also, when there is a human body detection reaction only in the first human body detection means 1A, it is determined that a human body exists only in the detection area a at a long distance, and when there is a human body detection reaction only in the second human body detection means 1B. It is determined that the human body exists only in the detection area c at a short distance. Therefore, it is possible to determine the presence / absence of a person in a detection area having a number of distances different from the number of human body detection means, and it is possible to reliably determine the distance at which the person is present.

In this embodiment, “the condensing areas are substantially the same shape and overlap each other” means an effective range for actual use in an air conditioner, for example, a wall of a room such as a normal LDK. Assuming that a sensor is installed in the installed air conditioner), the distance from the sensor to the place where people often live is at least 5 to 7 meters, and the tremor of the person who is relaxing at this distance ( In order to capture approximately 10-20 cm of the upper body, movements of hands, heads, etc.) with multiple sensors at the same time, the accuracy of the mounting angle between the sensors (accuracy in mounting the sensor) is also considered. It is desirable that the angle deviation indicating the area range is within 3 degrees "(the horizontal light condensing direction and the angle deviation indicating the light condensing distance range are each within 3 degrees), and further within 1 degree. More preferable.

  FIG. 5 shows a flowchart of human body detection according to the first embodiment of the present invention.

  First, in step S01, a counter t for measuring time is initialized (t = 0). In step S02, if the first human body detection means 1A detects the difference in the amount of infrared rays in the detection area 5A and there is a human body detection reaction, the process proceeds to step S03, and if there is no human body detection reaction, the process proceeds to step S05.

  In step S03, if the second human body detecting means 1B detects the difference in the amount of infrared rays in the detection area 5B and there is a human body detection reaction, the process proceeds to step S04, and if there is no human body detection reaction, the process proceeds to step S08.

  In step S04, it is determined whether the time counter t is within a predetermined time (for example, 10 seconds). If it is within the predetermined time, the first human body detecting means 1A and the second human body detecting means 1B react almost simultaneously. In step S06, it is determined that a human body is present in the detection area b at the intermediate distance between the overlapping areas of the detection area 5A and the detection area 5B.

  In step S04, if the counter t for measuring time exceeds a predetermined time (for example, 10 seconds), it is considered that the first human body detecting means 1A and the second human body detecting means 1B have reacted separately. In S07, it is determined that a human body exists in both the long-distance detection area a and the short-distance detection area c of the non-overlapping portion of the detection area 5A and the detection area 5B.

  In step S08, since the first human body detecting unit 1A detects the human body and the second human body detecting unit 1B does not detect the human body, it is determined that the human body exists only in the long-distance detection area a of the non-overlapping portion.

  If the first human body detecting means 1A does not detect the human body in step S02 and the second human body detecting means 1B detects the human body in the next step S05, the detection area of the short distance of the non-overlapping portion in step S09 It is determined that a human body exists only in c.

  Even in step S05, if the second human body detection means 1B does not detect a human body, it is determined in step S10 that no human body exists in the detection area.

  These human body detection flows are repeated as necessary.

  In the present embodiment, the presence / absence of the human body is determined using the detection result of each human body detection unit. However, the presence / absence of the human body may be determined by accumulating the detection results of the human body detection unit a plurality of times. The characteristics of each region may be set from the accumulated result, and the presence / absence of the human body may be determined by adding the detection result of the human body detection means to the region characteristics. As a result, the accuracy of human body detection can be improved.

  In the present embodiment, the light collection regions of the first human body detection unit 1A and the second human body detection unit 1B in the detection area b at the intermediate distance which is an overlapping portion overlap each other in a shape that is substantially the same. Therefore, the effective detection area 5A of the first human body detection means 1A is divided into 24 parts 5A1 to 5A24, and the effective detection area 5B of the second human body detection means 1B is divided into 18 parts 5B1 to 5B18. Needless to say, this does not matter.

6A is a plan view of a condensing region of two pairs of infrared detection areas of another human body detection apparatus according to the first embodiment of the present invention, and FIG. 6B is a side view thereof. XX 'cross section, side view is YY' cross section).

  The effective detection area 5B of the first human body detecting means 1B detects the presence or absence of a human body in the left detection area d and the central detection area e when viewed from the sensor, and the effective detection area 5C of the second human body detecting means 1C. The effective detection area is arranged so as to detect the presence or absence of a human body in the detection area f on the right side as viewed from the sensor and the detection area e in the center.

  That is, if the direction in which infrared rays are incident at right angles to the light receiving surfaces of the infrared detectors 2B and 2C of the human body detection means 1B and 1C is the light collection direction of the human body detection means, the light collection of the human body detection means 1B and 1C. The direction is different.

  On the other hand, the detection areas 5B and 5C of the human body detection means 1B and 1C have the same distance from the sensor, that is, the light collection distance.

  That is, the infrared detection areas d and f of the non-overlapping portions of the first human body detection unit 1B and the second human body detection unit 1C are arranged such that the horizontal light collection directions are different from each other and the light collection distances are equal to each other. It arrange | positions so that it may mutually overlap in the area e.

  Furthermore, each detection area 5B, 5C is comprised from several condensing area | regions, and each condensing of the 1st human body detection means 1B and the 2nd human body detection means 1C in the center detection area e which is an overlap part. The light distribution is such that the regions overlap with each other in a substantially matched shape.

In the present embodiment, the detection area 5B is divided into 18 condensing areas 5B1 to 5B18, and the detection area 5C is divided into 18 parts into 5C1 to 5C18. Condensed regions 5B1 to 5B5, 5B11 to 5B14 and 5C6 to 5C10, 5C15
.About.5C18 are distributed so as to overlap each other in a substantially coincident shape.

  As a result, when a person moves in the detection area e which is an overlapping portion, the first human body detecting means 1B and the second human body detecting means 1C which include the overlapping portion e as a part of the detection area are detected substantially simultaneously. be able to. For example, when the first human body detecting means 1B detects the presence or absence of a human body in the light condensing area 5B4 with the infrared light condensing unit 3B4, the second human body detecting means 1C has a shape substantially coincident with the light condensing area 5B4. The presence or absence of a human body can be detected by the infrared condensing unit 3C9 corresponding to the overlapping condensing region 5C9. Therefore, the human body detection area determination means 4 is based on the output information of the human body detection reaction of the first human body detection means 1B and the second human body detection means 1C, and the first human body detection means 1B and the second human body detection means. When 1C reacts within a predetermined time, it is determined that a human body exists in the detection area e at the intermediate distance of the overlapping portion.

  On the other hand, when it reacts exceeding the said predetermined time, it determines with a human body existing in both the detection area d of the left side of the non-overlapping part, and the detection area f of the right side. For example, when there is a reaction between the infrared condensing unit 3B8 of the first human body detecting means 1B corresponding to the condensing region 5B8 and the infrared condensing unit 3C12 of the second human body detecting means 1C corresponding to the condensing region 5C12 In addition, the human body detection area determination unit 4 determines the human body existence area from the human body detection reactions of the first human body detection unit 1B and the second human body detection unit 1C. However, there is a possibility that a plurality of persons move almost simultaneously. Therefore, when the detection reaction by the first human body detection unit 1B and the second human body detection unit 1C has occurred over a predetermined time, it is determined that each is a different place. It is determined that a human body exists in both the left detection area d and the right detection area f.

Further, when there is a human body detection reaction only in the first human body detection means 1B, it is determined that a human body exists only in the left detection area d, and when there is a human body detection reaction only in the second human body detection means 1C, It is determined that a human body exists only in the detection area f on the right side. Therefore, it is possible to determine the presence / absence of a person in a detection area having a larger number of horizontal directions than the number of human body detection means, and to reliably determine the direction in which the person is present.

  As described above, since the human body detection device according to the present invention can detect a human body with higher accuracy without greatly changing the structure, an air conditioner, an air purifier, a dehumidifier, a humidifier, a fan, and a ventilation fan. It can also be applied to other uses.

(A) of the condensing area | region of two pairs of infrared detection areas of the human body detection apparatus in Embodiment 1 of this invention is a top view, (b) is a side view 1 is a block diagram of the entire configuration of a human body detection device according to Embodiment 1 of the present invention. The front view of the infrared condensing part of the human body detection apparatus in Embodiment 1 of this invention (A) of a condensing area | region of a pair of infrared detection area of the human body detection apparatus in Embodiment 1 of this invention is a top view, (b) is a side view Flow chart of human body detection in Embodiment 1 of the present invention (A) of the condensing area | region of two pairs of infrared detection areas of another human body detection apparatus in Embodiment 1 of this invention is a top view, (b) is a side view The top view which shows an example of the detection area of the conventional human body detection apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1C Human body detection means 2, 2A, 2B, 2C Infrared detection part 3, 3A, 3B, 3C Infrared condensing part 3B1-3B18 Divided condensing lens 4 Human body detection area determination means 5, 5A, 5B, 5C detection area 5A1 to 5A27, 5B1 to 5B18, 5C1 to 5C18 Condensing area 6, 6A, 6B, 6C Amplifier 7, 7A, 7B, 7C Infrared processing means

Claims (6)

An infrared detector that detects infrared rays radiated from a human body and an infrared detector that is provided in pairs with the infrared detector, and that divides the infrared detection area into a plurality of condensing areas and collects infrared rays from the infrared detection area A plurality of human body detection means having a light collecting portion, a part of the infrared detection area of at least two of the human body detection means overlaps each other, and a light collection region of a non-overlapping part of the infrared detection area is a light collection distance The human body detecting apparatus is characterized in that horizontal condensing directions are arranged to be equal to each other, and the condensing region in the overlapping portion has a shape in which the overlapping portions substantially coincide with each other. When at least two human body detection means having overlapping portions react within a predetermined time, it is determined that a human body exists in the overlapping portion of the infrared detection area, and when each reacts over the predetermined time, the infrared detection area The human body detection device according to claim 1, further comprising a human body detection area determination unit that determines that a human body exists in the non-overlapping portion. The human body detection device according to claim 2 , wherein the at least two human body detection units having overlapping portions have the same horizontal light collection direction. At least two human body detection means having overlapping portions, to any one of claims 1 or claim 2 condensing region of the non-overlapping portion is characterized in that the horizontal condensing directions different from each other in the infrared detection area The human body detection device described. The human body detection device according to claim 4 , wherein the at least two human body detection units having overlapping portions have the same light collection distance. The air in the room that has been heat exchanged in the heat exchanger, depending on the human body presence or absence detected by the human body detecting device, any one of claims 1 to 5, controlled by the blower, characterized in that blowing into the room An air conditioner comprising the human body detection device according to item 1.

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