JP2005084033A - Human body detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a human body detection device excellent in wrong detection prevention, while having a simple constitution. <P>SOLUTION: Sensor blocks 1A, 1B or the like are stored in an internal space enclosed by a body 13 and a cover 14. The sensor blocks 1A, 1B are constituted of infrared detection elements 2A, 2B and reflecting mirrors 3A, 3B, and stored in an apparatus body in the form wherein angles of reflecting surfaces of the reflecting mirrors 3A, 3B with respect to the apparatus body are mutually differentiated in the vertical direction. The widths of detection beams BM1, BM2 or the interval between the detection beams BM1, BM2 can be set individually according to the shape, the size or the like of the reflecting surface of each reflecting mirror 3A, 3B, and this human body detection device excellent in detection error prevention, while having a simple constitution compared with a conventional sample comprising a plurality of infrared detection elements and one reflecting mirror, is provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a human body detection device that detects the presence or absence of a human body in a detection area using infrared rays emitted from the human body.

  2. Description of the Related Art Conventionally, various human body detection devices that detect the presence or absence of a human body in a detection area using infrared rays emitted from the human body have been provided. In this type of human body detection device, various measures are taken so as not to erroneously detect an object other than the human body as a human body, and one of them is a combination of sensors. For sensor combination, a sensor block comprising a twin-type infrared sensor in which a plurality of independent infrared detection elements (for example, pyroelectric elements) are housed in the same package, and an optical system that collects infrared rays on each element. In general, a configuration that uses a detector (see, for example, Patent Document 1) or a configuration that complements using detection means (for example, an ultrasonic wave) other than infrared rays is used. Further, as a countermeasure other than the combination of sensors, detection errors are also prevented by performing signal processing on detection signals obtained for each of a plurality of detection beams formed by an optical system.

Patent Document 1 discloses a two-stage twin type sensor in which the outputs of two pyroelectric elements juxtaposed in the horizontal direction are connected in series or in parallel to take out the differential output of both. The sensor block is composed of a dual-twin sensor and a condensing mirror, and has four detection beams that are condensed by the condensing mirror onto a total of four pyroelectric elements. The angle between the detection beam for one twin sensor and the detection beam for the other twin sensor is changed by changing the distance between the twin sensors.
JP-A-10-213673

  By the way, in the configuration in which erroneous detection is prevented by having a plurality of independent detection areas (detection beams), the width of the detection area (detection beam) is optimally set in the distance to the detection target, and a plurality of independent detection areas (detection beams) are provided. It is necessary to arrange the detection areas (detection beams) at optimal positions. However, since the arrangement of pyroelectric elements in each twin sensor is fixed in the conventional example disclosed in Patent Document 1, the width of the detection area (detection beam) and the interval between the detection areas (detection beams) Cannot be individually set, and it is very difficult to configure a detection area (detection beam) that is optimal for preventing erroneous detection with a simple configuration.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a human body detection device that has a simple configuration and is excellent in preventing erroneous detection.

  In order to achieve the above object, a first aspect of the present invention provides an infrared detection element that detects infrared rays emitted from a human body, a plurality of sensor blocks including a reflecting mirror that collects infrared rays on the infrared detection elements, and each sensor. A signal processing unit that performs signal processing on the output of the infrared detection element for each block to determine the presence or absence of a human body in the detection area, and a container that houses a plurality of sensor blocks and the signal processing unit and is disposed on the construction surface The plurality of sensor blocks are housed in the container in such a manner that the angles of the reflecting surfaces of the reflecting mirror with respect to the container are different from each other.

  According to the present invention, it is possible to individually set the detection area width of the plurality of sensor blocks and the interval between the detection areas according to the size and angle of the reflecting surface of the reflecting mirror. It is possible to provide a human body detection device that has a simple configuration compared to a conventional example composed of two reflecting mirrors and is excellent in preventing erroneous detection.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the plurality of sensor blocks have different shapes of detection beams condensed by the reflecting mirror.

  According to the present invention, the degree of freedom in handling the detection area is increased.

  A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the plurality of sensor blocks are integrally formed by arranging the respective reflecting mirrors in the horizontal direction.

  According to the present invention, since the reflecting mirror is integrally formed, the cost can be reduced by reducing the number of parts.

  The invention of claim 4 is characterized in that, in the invention of claim 3, there is provided tilting means for tilting the integrally formed reflecting mirror with respect to the body.

  According to the present invention, it is possible to adjust the detection area by tilting the reflecting mirror after construction, and since the reflecting mirrors of a plurality of sensor blocks are integrally formed, detection is performed for each individual sensor block. The labor for adjusting the area can be saved, and the relative positional relationship of the detection beams does not change, so that the adjustment accuracy is increased.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the plurality of sensor blocks are characterized in that the detection beams collected by the reflecting mirrors are shifted from each other along the moving direction of the human body. To do.

  According to the present invention, it is possible to improve detection accuracy while suppressing erroneous detection of human existence due to noise or vibration.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the plurality of sensor blocks include a reflecting mirror having a plurality of reflecting surfaces and formed so that the detection beams condensed on the reflecting surfaces are arranged in a vertical direction. And the detection beam of one sensor block is formed to be adjacent to the detection beams of other sensor blocks adjacent in the vertical direction and the horizontal direction.

  According to the present invention, at least two detection beams adjacent in the horizontal direction are detection beams of different sensor blocks, and even if it becomes difficult to detect because the detection beam of any sensor block becomes thin, In the vertical direction, the human body can always pass through multiple detection beams under the same conditions. Therefore, variation in detection sensitivity is suppressed compared to the case where two detection beams adjacent in the horizontal direction are detection beams of the same sensor block. The human body can be detected reliably.

  According to a seventh aspect of the present invention, there is provided an infrared detection element for detecting infrared rays radiated from a human body, a plurality of sensor blocks comprising a reflecting mirror for condensing infrared rays on the infrared detection elements, and an output of the infrared detection element for each sensor block. A signal processing unit that performs signal processing to determine the presence or absence of a human body in the detection area, and a plurality of sensor blocks and a container that accommodates the signal processing unit and is disposed on the construction surface, and the plurality of sensor blocks include: It is characterized by being housed in the container so as to be arranged on the same circumference.

  According to the present invention, a detection beam can be arranged on the circumference to form a so-called round detection area, which is simpler than the conventional example composed of a plurality of infrared detection elements and one reflecting mirror. It is possible to provide a human body detection device that is excellent in preventing erroneous detection.

  According to an eighth aspect of the invention, in the seventh aspect of the invention, each sensor block outputs a single pulse signal each time infrared rays are detected by the infrared detecting element, and the signal processing unit is outputted from each sensor block. When the pulse signal is counted and the count value exceeds a predetermined threshold value within a predetermined time, it is determined that a human body is present in the detection area, and further compared to the movement time of the human body from the time when one pulse signal is output. When another pulse signal is output before a very short predetermined time elapses, the one pulse signal and the other pulse signal are not counted.

  According to the present invention, it is possible to suppress erroneous detection due to a heat source other than the human body or erroneous detection of the human body due to noise or vibration.

  According to a ninth aspect of the present invention, in the seventh aspect of the present invention, the signal processing unit is configured so that the human body is detected by another sensor block within a predetermined time corresponding to the moving time of the human body from the time when the presence of the human body is detected by the one sensor block. It is characterized in that it is determined that a person is present in the detection area when the presence of the object is detected.

  According to the present invention, erroneous detection due to a heat source other than the human body can be suppressed.

  According to the present invention, it is possible to individually set the detection area widths of the plurality of sensor blocks and the intervals between the detection areas according to the size and angle of the reflecting surface of the reflecting mirror. There is an effect that it is possible to provide a human body detection device that has a simple configuration and is excellent in prevention of erroneous detection as compared with the conventional example including two reflecting mirrors.

(Embodiment 1)
FIG. 4 shows a circuit block of this embodiment. The two sensor blocks 1A and 1B are composed of pyroelectric infrared detecting elements 2A and 2B and reflecting mirrors 3A and 3B. The signal is input to the signal processing unit 4. The signal processing unit 4 compares the output levels of the infrared detection elements 2A and 2B with a threshold value. If the threshold value is exceeded, the signal processing unit 4 determines that a human body exists in the detection area and sends a control signal to the relay drive circuit 5. Output is performed and the indicator lamp 6 is turned on. When the relay drive circuit 5 receives the control signal from the signal processing unit 4, the relay drive circuit 5 drives the relay 7 to switch the switching contact from the normally closed side to the normally open side, thereby outputting a human body detection signal to the outside. Common terminal T1, normally open terminal T2, and normally closed terminal T3 are connected to the common contact, normally open contact, and normally closed contact of relay 7, respectively, and common terminal T1 and normally open terminal T2 are short-circuited via relay 7. As a result, a human body detection signal is output to an external device. The indicator lamp 6 is composed of a light emitting diode or the like, and lights up to display an operation when a human body detection signal is output. The operating power supply for the infrared detection elements 2A and 2B, the signal processing unit 4 and the like rectifies the AC voltage of the commercial AC power supply connected to the power supply terminals T4 and T5 by the full-wave rectifier 8 including a diode bridge, The voltage is converted into a predetermined constant voltage by a constant voltage circuit 9 and supplied. In FIG. 4, reference numeral 10 denotes an operation unit having a setting switching switch, and the signal processing unit 4 switches various settings in accordance with the operation state of the switch and the like in the operation unit 10.

  On the other hand, the present embodiment has a structure as shown in the exploded views of FIGS. The body is formed into a flat bottomed cylindrical shape whose front surface is opened by a synthetic resin material and is attached to a construction surface such as a ceiling surface, and an annular base 12 fixed to the inside of the attachment case 11. A body 13 that is fixed to the base 12 and closes the front opening of the mounting case 11, and a cover 14 that is hemispherically formed of a synthetic resin material that transmits infrared rays and is attached to the front surface of the body 13. Sensor blocks 1A and 1B and a printed wiring board 15 are accommodated in an internal space surrounded by the body 13 and the cover. A circular lead-in hole 11a is provided in the center of the bottom surface of the mounting case 11, and the electric wires connected to the terminals T1 to T5 are drawn through the lead-in hole 11a into the interior of the container body. Four projecting pieces 11b, each having a claw 11c projecting outward at the tip, project from the peripheral edge of the drawing hole 11a with a gap therebetween. Further, four dart holes 11d are formed on the bottom surface of the mounting case 11 so as to surround the drawing holes 11a so as to be arranged at equal intervals on the same circumference, and the mounting screws inserted from the front into these dart holes 11d. The attachment case 11 is attached to the construction surface by fixing (not shown) to the construction surface. Further, the projecting piece 11 b is inserted into an insertion hole 12 a provided in the center of the base 12, and the claw 11 c at the tip of the projecting piece 11 b is locked to the periphery of the insertion hole 12 a so that the base 12 is attached to the mounting case 11.

  The base 12 is provided with a substrate 17 mounted on the front side, on which a terminal block 16 provided with terminals T1 to T5 and sockets 17a connected to the terminals T1 to T5 of the terminal block 16 are mounted. The electric wire drawn through the drawing hole 11a of the case 11 is inserted into the insertion hole 12a and connected to the terminals T1 to T5 of the terminal block 16. The base 12 is provided with a rectangular engagement hole 12b penetrating in the front-rear direction, and a lock body 18 is provided at an end opposite to the engagement hole 12b with the insertion hole 12a interposed therebetween. The lock body 18 is formed in a substantially U-shape with a locking piece 18b having a claw 18a projecting from the tip and an operation piece 18c connected to the rear end of the locking piece 18b. A shaft (not shown) provided on both end faces of the connecting portion between the piece 18b and the operation piece 18c is used as a fulcrum, and the claw 18a is rotatably attached to the base 12 so as to face the insertion hole 12a. Further, the lock body 18 is elastically biased in a turning direction in which the claw 18a approaches the insertion hole 12a by a return spring 19 made of a torsion coil spring.

  The body 13 is made of a synthetic resin molded product having a disk shape as a whole, and a peripheral wall 13b having a ring shape with a U-shaped cross section is formed on the peripheral edge of the circular bottom plate 13a. On the back side of the bottom plate 13a, an assembly piece 20 provided with a claw 20a projecting outward is provided projecting rearward (see FIGS. 1 and 3). Further, a projecting portion 13c protruding forward is provided at one end portion of the bottom plate 13a so as to allow the terminal block 16 to escape, and an exposure window 13d exposing the front surface of the terminal block 16 is opened at the tip of the projecting portion 13c. ing.

  Further, a pair of support pieces 21 on which the sensor blocks 1A and 1B are pivotally supported so as to be freely tiltable (rotatable) project from a substantially central portion of the front surface of the body 3. A bearing hole 21a is provided at the tip of the support piece 21, and the sensor blocks 1A and 1B are paired by inserting the rotating shaft 3d of the sensor block 1A and 1B into the bearing hole 21a as will be described later. The support piece 21 is rotatably supported. Further, as shown in FIG. 3, a claw 18a provided at the distal end of the locking piece 18b of the lock body 18 is engaged with the inner peripheral surface of the peripheral wall 13b at the end opposite to the assembly piece 20 so as to freely advance and retract. A joint hole 22 is provided therethrough. That is, the assembly piece 20 is inserted into the engagement hole 12b of the base 12, the claw 20a is engaged with the periphery of the engagement hole 12b, and the engagement piece 18b of the lock body 18 is inserted into the peripheral wall 13b. The body 3 is attached to the base 12 by engaging the claw 18a at the tip of 18b with the engagement hole 22 of the peripheral wall 13b. Here, a rectangular operation hole 13e is provided in a portion facing the lock body 18 on the front surface of the peripheral wall 13b, and the front end is exposed to the outside through the operation hole 13e in a state where the body 13 is attached to the base 12, and the rear end An operation button 23 whose portion is in contact with the operation piece 18c of the lock body 18 is disposed inside the peripheral wall 13b. The operation button 23 is formed of a strip-shaped synthetic resin molded product, and an outer collar 23a is provided in the vicinity of the distal end portion to abut against the periphery of the operation hole 13e and prevent it from coming off. Thus, the operation button 23 is arranged so as to be movable in the front-rear direction (vertical direction in FIG. 3) with respect to the body 13, and when the tip of the operation button 23 protruding from the operation hole 13e is pushed, The operation piece 18c of the lock body 18 is pushed at the rear end of the button 23 to rotate the lock body 18 against the spring force of the return spring 19, and the engagement hole between the claw 18a of the locking piece 18b and the peripheral wall 13b. The body 13 can be removed from the base 12 by releasing the engagement with the base 22.

  Further, as shown in FIG. 2, the peripheral surface facing the bottom plate 13a of the peripheral wall 13b includes a vertical groove 25a whose front end is open, and a horizontal groove 25b continuous from the rear end of the vertical groove 25a along the peripheral direction of the peripheral wall 13b. A plurality of mounting grooves 25 are provided at equal intervals. On the other hand, a plurality of protrusions (not shown) are provided on the outer peripheral surface on the opening end side of the hemispherical cover 14, and the cover 14 is inserted into the vertical groove 25 a so that the cover 14 is inserted into the body 13. The cover 14 is attached to the front surface, and the cover 14 is rotated to allow the protrusion to enter the horizontal groove 25b from the vertical groove 25a. Further, if the cover 14 is rotated in the direction opposite to the direction of attachment and the protrusion is moved from the horizontal groove 25b to the vertical groove 25a, the prevention of the protrusion from being removed by the attachment groove 25 is released, and the cover 14 can be removed from the body 13. it can.

  The printed wiring board 15 accommodated between the body 13 and the cover 14 is formed in a substantially C shape, and the signal processing unit 4, the relay drive circuit 5, the indicator lamp 6, the relay 7 and the full wave rectifier shown in FIG. 8, the constant voltage circuit 9 and the jack 26 are mounted on the surface of the body 13 facing the bottom plate 13a. Then, the plug 17a and the jack 26 mounted on the substrate 17 are connected through a window hole (not shown) opened in the bottom plate 13a of the body 13, thereby mechanically fixing the printed wiring board 15 and each circuit. The terminals T1 to T5 are electrically connected.

  The two sensor blocks 1 </ b> A and 1 </ b> B are housed between the body 13 and the cover 14 together with the printed wiring board 15. Here, in this embodiment, the reflecting mirrors 3A and 3B of the respective blocks 1A and 1B are opposed to each other at three flat side walls 3a arranged substantially in parallel as shown in FIG. 5 and at one end of the side wall 3a. The mirror portion 3b provided between the side walls 3a is integrally formed in the horizontal direction as a synthetic resin molded product. Further, insertion holes 3c through which the end portions of the rectangular plate-like sensor substrate 27 on which the infrared detection elements 2A and 2B are mounted are inserted in the other end portions of the side walls 3a at both ends. Further, a rotating shaft 3d is projected from the outer side surfaces of the side walls 3a at both ends, and the bearings of the pair of support pieces 21 in which these two rotating shafts 3d are projected forward from the bottom plate 13a of the body 13. The reflecting mirrors 3A and 3B, that is, the sensor blocks 1A and 1B are pivotally supported by the body 13 by being inserted into the holes 21a.

  In the infrared detection elements 2A and 2B in the present embodiment, two light receiving portions having different polarities are housed in a cylindrical metal package, and an infrared incident window is provided on an end surface in the axial direction of the metal package facing the light receiving portions. (Not shown) is provided, and a terminal (not shown) protruding from the other end surface in the axial direction is soldered to the sensor substrate 27 and mounted on the sensor substrate 27. However, the present applicant has already put into practical use a small-sized infrared sensor configured by integrating an amplifier and a comparator for comparing the output level of the light receiving unit with a threshold value and storing it in the metal package together with the light receiving unit. The infrared sensor may be used as the infrared detection elements 2A and 2B of the present embodiment.

  In a state where the sensor substrate 27 is attached to the ends of the reflecting mirrors 3A and 3B, as shown in FIG. 1, the incident window of the infrared detecting element 2A faces the mirror section 3b of the reflecting mirror 3A, and the incident of the infrared detecting element 2B. The window faces the mirror portion 3b of the reflecting mirror 3B. The mirror unit 3b has a large number of mirror surfaces with different focal points, and can form various detection beams (detection areas) as described later according to the shape, size, and arrangement of the large number of mirror surfaces. .

  Here, the mirror portion 3b of each of the reflecting mirrors 3A and 3B has a plurality of mirror surfaces formed symmetrically with respect to the central axis parallel to the side wall 3a as shown in FIG. 5B. As shown in FIG. 6, the detection beams BM1 and BM2 collected at 1 are different from each other within an angle of 0 to 90 degrees with respect to the vertical direction, and do not overlap with each other in the vertical direction and the horizontal direction. 6A shows the detection beam BM1 of the reflecting mirror 3A viewed from the vertical direction and the detection beam BM2 of the reflecting mirror 3B, and FIG. 6B shows the detection beams BM1 and BM2 viewed from the horizontal direction. Show. The two reflecting mirrors 3A and 3B are different in the angle of the mirror surface of the mirror portion 3b with respect to the body in the vertical direction, and the detection beam BM1 of one reflecting mirror 3A and the detecting beam of the other reflecting mirror 3B. BM2 is arranged alternately in the vertical direction.

  Thus, since the infrared detection elements 2A and 2B in the present embodiment are of a pyroelectric type, an output is obtained when the intensity of the detection beams BM1 and BM2 changes due to infrared rays radiated from the human body. The signal is processed by the processing unit 4 and compared with a threshold value. When the threshold value is exceeded, it is determined that a human body exists, and the determination result is output to the outside through the relay 7. Here, in the present embodiment, two sensor blocks 1A and 1B having different angles of the reflecting surfaces of the reflecting mirrors 3A and 3B (mirror surfaces of the mirror portion 3b) with respect to the body are provided in the vertical direction, and the detection beams BM1, The width of BM2 and the interval between the detection beams BM1 and BM2 can be individually set according to the shape and size of the reflection surface of each of the reflecting mirrors 3A and 3B. It is possible to provide a human body detection device that has a simple configuration as compared with a conventional example made of a mirror but is excellent in preventing erroneous detection.

  Further, by forming the reflecting mirrors 3A and 3B of the two sensor blocks 1A and 1B in the horizontal direction and integrally forming them, the cost can be reduced by reducing the number of parts and the size can be reduced as compared with the case where they are arranged in the vertical direction. There is also an advantage. That is, since the infrared detection elements 2A and 2B have a vertically long shape, the horizontal direction (horizontal direction) is compared to the case where the reflecting mirrors 3A and 3B are arranged in the vertical direction so that they are aligned in the vertical direction (vertical direction). Since the infrared detectors 2A and 2B need to be arranged stepwise in the front-rear direction so that the detection beams BM1 and BM2 do not overlap when arranged in the vertical direction, this is also the case. It is possible to reduce the size by arranging them in the horizontal direction.

  Furthermore, since the reflecting mirrors 3A and 3B formed integrally are tilted (rotated) with respect to the body, it is possible to adjust the detection area by rotating the reflecting mirrors 3A and 3B after construction. Moreover, since the reflecting mirrors 3A and 3B of the two sensor blocks 1A and 1B are integrally formed, it is possible to save the trouble of adjusting the detection area for each of the sensor blocks 1A and 1B. Since the relative positional relationship between the beams BM1 and BM2 does not change, there is an advantage that the accuracy of adjustment is increased. When the two sensor blocks 1A and 1B are arranged in the vertical direction, the structure of the tilting means must be complicated so as not to block the detection beams BM1 and BM2 of the blocks. In the embodiment, since these are arranged horizontally, the sensor blocks 1A and 1B can be rotated with a relatively simple structure.

  By the way, in order to improve the accuracy of human body detection, when both the outputs of the two sensor blocks 1A and 1B exceed the threshold value, that is, by the logical product of human body detection by the two sensor blocks 1A and 1B, the signal processing unit 4 It may be determined that a human body exists. At this time, in order to prevent erroneous detection due to noise or vibration, the logical product processing of human body detection by the two sensor blocks 1A and 1B within a predetermined time is invalidated. On the other hand, as shown in FIG. 7, when the detection beams BM1 and BM2 of the two sensor blocks 1A and 1B are aligned in the moving direction of the human body (see the arrow a in FIG. 7B), the human body moves in that direction. In some cases, the output level exceeds the threshold value almost simultaneously in the two sensor blocks 1A and 1B, so that the logical product of the human body detection is invalidated and may not be detected in the above-described processing.

  Therefore, in the present embodiment, in order to suppress the occurrence of the above-described problems, the detection beams BM1 and BM2 obtained by condensing the two sensor blocks 1A and 1B by the reflecting mirrors 3A and 3B as shown in FIG. They are shifted from each other along the moving direction of the human body (see arrow A in FIG. 8B). Specifically, as shown in FIG. 5B, the mirror portions 3b of the two reflecting mirrors 3A and 3B are relatively shifted in a direction orthogonal to the normal direction of the incident windows of the infrared detecting elements 2A and 2B. It is integrally formed. Here, the amount of shifting the two mirror units 3b is, for example, when the moving speed of the human body is 2.0 [m / s] at maximum and the predetermined time for disabling the logical product processing is 100 [ms]. The amount of the two detection beams BM1 and BM2 may be set so as to deviate by 100 [ms] × 2.0 [m / s] = 0.2 [m] or more at a position away from the mirror unit 3b by the detection target distance. FIG. 9 shows the detection beams BM1 and BM2 when the mirror unit 3b is displaced in this way.

  Thus, by shifting the detection beams BM1 and BM2 of the two sensor blocks 1A and 1B along the moving direction of the human body, it is possible to improve the accuracy of human body detection while preventing erroneous detection due to noise and vibration.

  The shape of the detection beams BM1 and BM2, that is, the detection area is determined by the shape of the mirror portion 3b of the reflecting mirrors 3A and 3B. For example, the mirror portion 3b shown in FIG. As shown in FIG. 13, the mirror portion 3b shown in FIG. 12 has a rectangular shape centered directly below, and the mirror portion 3b shown in FIG. As shown in Fig. 4, the curtain shape includes a short distance to a long distance. And even if it uses reflector 3A, 3B which has any of these detection areas, it cannot be overemphasized that this embodiment has the same operation effect. In addition, according to the mirror part 3b as shown in FIG. 10, the detection beams (detection areas) BM1 and BM2 having different shapes are formed as shown in FIG. 11, and it is possible to detect a short distance and a long distance simultaneously. There is an advantage that the degree of freedom in dealing with the detection area is increased.

  By the way, as shown in FIG. 16A, the detection beams BM1 and BM2 of the sensor blocks 1A and 1B are adjacent to the detection beams BM2 and BM1 of the other sensor blocks 1B and 1A in the vertical direction and the same in the horizontal direction. The detection beams BM1 and BM2 of the sensor blocks 1A and 1B are formed so as to be adjacent to each other. However, for example, one detection beam BM1 becomes thin (a detection area becomes narrow) at an arbitrary detection distance, and is difficult to detect. Sometimes. That is, if the detection beams BM1 arranged in the horizontal direction are uniformly thinned, it becomes difficult to pass the two detection beams BM1 and BM2 under the same conditions, and the detection sensitivity varies. Therefore, as shown in FIG. 16B, it is desirable that the detection beams BM1 of one sensor block 1A are arranged in the vertical direction and adjacent to the detection beams BM2 of other sensor blocks 1B adjacent in the horizontal direction. . In this way, at least two detection beams BM1 and BM2 adjacent in the horizontal direction are the detection beams BM1 and BM2 of the different sensor blocks 1A and 1B, respectively, and the detection beams BM1 and BM1 of any one of the sensor blocks 1A and 1B are used. Even if the BM2 becomes thin and difficult to detect, the human body can always pass through the plurality of detection beams BM1 and BM2 in the vertical direction, so that the two detection beams BM1 and BM2 adjacent in the horizontal direction can be passed. As compared with the case where the detection beams are of the same sensor block, there is an advantage that variation in detection sensitivity is suppressed and a human body can be detected reliably.

(Embodiment 2)
As shown in FIG. 17, the present embodiment is characterized in that four sensor blocks 1A to 1D are housed in the body so as to be arranged on the same circumference.

  The four sensor blocks 1A to 1D all have the same structure. As shown in FIG. 18, the infrared detection elements 2A to 2D and two flat side walls 3a and 3a arranged substantially in parallel are arranged. The mirror part 3b provided between the side walls 3a at one end includes the reflecting mirrors 3A to 3D integrally formed of a synthetic resin material, and the basic structure is the integrated sensor blocks 1A and 1B in the first embodiment. It is common. These four sensor blocks 1A to 1D are housed in the container with the mirror portions 3b of the reflecting mirrors 3A to 3D facing outward, respectively, and as shown in FIG. A so-called round-shaped detection beam (detection area) BM is formed.

  Each of the sensor blocks 1A to 1D outputs a single pulse signal each time infrared rays are detected by the infrared detection elements 2A to 2D. The signal processing unit 4 of the present embodiment counts the pulse signals output from the sensor blocks 1A to 1D, and the count value exceeds a predetermined threshold value (for example, 3) in a predetermined time (for example, 5 seconds). If a human body is present in the detection area, a human body detection signal is output to the outside, and after a predetermined time has elapsed, the count value is reset and pulse signal counting is started again. Suppresses false detection. However, the human body may be detected for each of the sensor blocks 1A to 1D as in the first embodiment, and in that case, the signal processing unit 4 has an output level of one sensor block 1A,. The output level of the other sensor block 1A,... Exceeds the threshold value within a predetermined time (for example, 10 seconds) corresponding to the moving time of the human body from the time when the threshold value is exceeded (the presence of the human body is detected). The human body detection signal is output to the outside only when the presence of a human body is detected, and the human body detection signal is not output to the outside otherwise. It is desirable.

  Thus, also in the present embodiment, as in the first embodiment, the width of the detection beam and the interval between the detection beams are set according to the shape and size of the reflecting surface of the reflecting mirror included in each of the sensor blocks 1A to 1D. A human body detection device that can be set individually and has a simple configuration as compared with the conventional example including a plurality of infrared detection elements and a single reflecting mirror, but is excellent in preventing erroneous detection can be provided. In addition, since these four sensor blocks 1A to 1D are housed in the container so as to be independently rotatable, for example, there is a heat source that causes a malfunction in the detection area of one sensor block 1A. If so, it is possible to easily adjust the sensor block 1A so that the heat source is not included in the detection area. However, the four sensor blocks 1A to 1D may be configured to rotate integrally with respect to the container.

  By the way, when a plurality of pulse signals are output from the sensor block 1A,... In a very short period compared to the moving time of the human body, there is a high possibility that it is due to noise or vibration. 4, when another pulse signal is output until a predetermined time (for example, 100 ms) that is extremely shorter than the moving time of the human body has elapsed since the time when one pulse signal was output. Signal detection and other pulse signals are not counted to improve human body detection accuracy.

  In the conventional example in which a round detection area is formed by a combination of one infrared detection element and an optical system such as a reflector or lens, one infrared detection element must cover all directions of 360 degrees. However, the sensitivity variation occurs depending on the moving direction of the human body. However, in the present embodiment, the round detection area is formed by using the plurality of sensor blocks 1A to 1D. Can be suppressed.

FIG. 2 is an exploded perspective view showing the first embodiment and viewed from the mounting base side. It is the disassembled perspective view which showed the same and was seen from the cover side. It is an exploded sectional view same as the above. It is a circuit part lock figure same as the above. The reflective mirror in the same is shown, (a) is a perspective view, (b) is a front view. The detection beam same as the above is shown, (a) is a top view and (b) is a side view. It is explanatory drawing same as the above. It is explanatory drawing same as the above. It is explanatory drawing of a detection beam same as the above. The reflective mirror of the other structure same as the above is shown, (a) is a perspective view, (b) is a front view. The detection beam same as the above is shown, (a) is a top view and (b) is a side view. The reflective mirror of the other structure in the same as the above is shown, (a) is a perspective view, (b) is a front view. The detection beam same as the above is shown, (a) is a top view and (b) is a side view. The reflector of another structure same as the above is shown, (a) is a perspective view, (b) is a front view. The detection beam same as the above is shown, (a) is a top view and (b) is a side view. It is explanatory drawing of a detection beam same as the above. FIG. 6 is a schematic diagram illustrating an arrangement of sensor blocks according to a second embodiment. It is a perspective view of the sensor block in the same as the above. The detection beam same as the above is shown, (a) is a top view and (b) is a side view.

Explanation of symbols

1A, 1B Sensor block 2A, 2B Infrared detector 3A, 3B Reflector 4 Signal processor 11 Mounting case 13 Body 14 Cover

Claims (9)

  A plurality of sensor blocks comprising an infrared detection element for detecting infrared rays radiated from the human body, a reflecting mirror for condensing infrared rays on the infrared detection element, and a detection area by performing signal processing on the output of the infrared detection element for each sensor block A signal processing unit for determining the presence or absence of a human body, and a plurality of sensor blocks and a container body that accommodates the signal processing unit and is disposed on the construction surface, and the plurality of sensor blocks reflect the reflector to the container body. A human body detection device, wherein the human body detection device is housed in a container so that the angles of the surfaces are different from each other.   The human body detection device according to claim 1, wherein the plurality of sensor blocks have different shapes of detection beams condensed by the reflecting mirror.   3. The human body detection device according to claim 1, wherein the plurality of sensor blocks are integrally formed by arranging the reflecting mirrors in the horizontal direction.   4. The human body detection device according to claim 3, further comprising tilting means for tilting the integrally formed reflecting mirror with respect to the body.   5. The human body detection device according to claim 1, wherein the plurality of sensor blocks are configured such that detection beams collected by the reflecting mirrors are shifted from each other along a moving direction of the human body.   The plurality of sensor blocks include a reflecting mirror that has a plurality of reflecting surfaces and is formed so that the detection beams condensed on each reflecting surface are arranged in the vertical direction. 6. The human body detection device according to claim 5, wherein the human body detection device is formed so as to be adjacent to a detection beam of another sensor block adjacent in the horizontal direction.   A plurality of sensor blocks comprising an infrared detection element for detecting infrared rays radiated from the human body, a reflecting mirror for condensing infrared rays on the infrared detection element, and a detection area by performing signal processing on the output of the infrared detection element for each sensor block A signal processing unit for determining the presence or absence of a human body, a plurality of sensor blocks, and a container body that houses the signal processing unit and is disposed on the construction surface, and the plurality of sensor blocks are arranged on the same circumference The human body detection device is housed in a container.   Each sensor block outputs a single pulse signal each time infrared is detected by the infrared detection element, and the signal processing unit counts the pulse signal output from each sensor block and the count value is within a predetermined time. When a predetermined threshold value is exceeded, it is determined that a human body exists in the detection area, and another pulse signal is passed from the time when one pulse signal is output until a predetermined time that is extremely shorter than the movement time of the human body has elapsed. 8. The human body detection device according to claim 7, wherein the one pulse signal and the other pulse signal are not counted when the signal is output.   The signal processing unit has a person in the detection area when the presence of a human body is detected by another sensor block within a predetermined time corresponding to the movement time of the human body from the time when the presence of the human body is detected by one sensor block. The human body detection device according to claim 7, wherein the determination is made.

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