JP2010071825A - Passive infrared sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a passive infrared sensor for adjacently disposing a plurality of detectors comprising infrared detecting elements and optical systems and having different alarm distances within a housing, individually setting the number of detections of each detector, and easily obtaining a high-accuracy detection performance, regardless of the alarm distance. <P>SOLUTION: The passive infrared sensor includes: the detectors disposed within the housing comprising a base and a cover, and having the optical systems and the infrared detecting elements; and a signal processing means for processing signals detected by the detectors. The detectors are composed of a plurality of the detectors comprising the optical systems and the infrared detecting elements, individually and adjacently disposed at an adjustable angle, and having different alarm distances. The signal processing means singularly processes the signals detected by a plurality of the detectors, and outputs a human body detection signal when a human body is detected by any detector. In a plurality of the detectors, the number of detections until the human detection signal is output can be individually set. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a passive infrared sensor capable of detecting infrared rays radiated by a human body in a detection area with a detector comprising an optical system and an infrared detection element, and in particular, a passive infrared sensor in which a plurality of detectors are arranged in a housing. It relates to sensors.

In general, a passive infrared sensor (hereinafter referred to as an infrared sensor) includes an infrared detection element such as a pyroelectric element and a detector including an optical system such as a mirror housing in a casing including a base and a cover. Infrared rays (heat rays) emitted from the warning area are collected by the optical system and detected by the infrared detection element, and this detection signal is processed by the signal processing means to determine whether the moving object related to the infrared rays is a human body. A predetermined detection signal is output in the case of a human body. Conventionally, as this type of infrared sensor, for example, this infrared sensor is disclosed in Patent Document 1, which includes a parabolic mirror disposed in a housing and two pyroelectric elements corresponding to the mirror. The distance between the electric elements is changed by the detection axis distance changing means, and the infrared sensor can be set from a long distance to a short distance.
Japanese Patent No. 3491270

  However, in such an infrared sensor, a parabolic mirror (optical system) and two pyroelectric elements corresponding to the mirror are arranged in the housing, but the optical sensor and the pyroelectric element are used. Since there is essentially one detector, if we try to capture from the heat change that occurs when an intruder crosses the vicinity of the sensor at high speed to the heat change that occurs when the intruder crosses the distance of the sensor at low speed, for example, the width of the heat change If the sensor exceeds the width that can be detected by a single characteristic of the infrared sensor, the characteristic of the infrared sensor has to be fixed to one that is moderate or advantageous, and it is uniformly high throughout the warning area. Unable to get performance.

  That is, when the detector itself is a single infrared sensor, each detection zone forming a warning area is widened in a fan shape according to the distance from the sensor on the horizontal plane, so that there is a small amount of moving objects in the vicinity of the sensor. It is easy to cross a plurality of detection zones. For example, when a small animal as a moving object crosses a plurality of nearby detection zones, it is easy to generate a false report of detecting this as a human body and outputting a detection signal.

  Therefore, in order to reduce this false alarm, there is a known method of setting the number of detections by the detector until the detection output is made multiple times, but this method is used to detect the detection zone in the vicinity and the distant detection zone. When applied to the infrared sensor that is used in a vessel, the false alarms caused by small animals crossing the nearby detection zone can be reduced, but a detection signal is output after multiple detections for an intruder crossing the remote detection zone, Depending on the movement path of the intruder, it is difficult to detect the intruder, and it is difficult to obtain highly accurate detection performance regardless of the warning distance.

  The present invention has been made in view of such circumstances, and an object of the present invention is to arrange a plurality of detectors having an infrared detection element and an optical system and having different warning distances close to the housing, and to detect each detection. It is an object of the present invention to provide a passive infrared sensor capable of easily obtaining highly accurate detection performance regardless of the guard distance by individually setting the number of times of detection of the device.

  In order to achieve this object, the invention described in claim 1 of the present invention is an optical system that is arranged in a casing made up of a base and a cover and collects infrared rays in a warning area made up of a plurality of detection zones. And a passive infrared sensor comprising: a detector having an infrared detection element for detecting infrared light collected by the optical system; and a signal processing means for processing a detection signal detected by the detector. Comprises a plurality of detectors each having the optical system and an infrared detecting element and arranged in close proximity to each other so as to be individually adjustable in angle, and the signal processing means is detected by the plurality of detectors. When the human body is detected by any one of the detectors and the human body detection signal can be output, the plurality of detectors can detect the number of detection times until the human body detection signal is output. Individually Characterized in that it is a constant possible.

  In the invention according to claim 2, the signal processing means can individually set the number of detections of the plurality of detectors by operating a setting switch provided in a setting unit connected to the signal processing means. It is characterized by being.

  According to the invention described in claim 1 of the present invention, a plurality of detectors each having an optical system and an infrared detection element, each of which is adjustable in angle and has a different warning distance, are arranged close to each other in the housing. Since the detection signal of the human body from the detector is processed independently by the signal processing means and the number of detections until the detection of the human body detection signal of each detector is individually set, detection of each detector with different warning distances The number of times can be varied, for example, it is possible to reliably detect an intruder (human body) in a remote detection zone while reducing false alarms due to small animals in the detection zone in the vicinity. It can be easily obtained.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, a plurality of detections are detected in the signal processing unit by operating a setting switch provided in the setting unit connected to the signal processing means. Since the number of times of detection of the device is individually set, it is possible to easily set the number of times of detection according to the installation environment, and it is possible to easily perform installation and maintenance work of the infrared sensor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 7 show an embodiment of a passive infrared sensor according to the present invention, FIG. 1 is a perspective view thereof, FIG. 2 is a conceptual diagram showing its internal configuration, and FIG. 3 is a block diagram of a control system. 4 and 5 are a flowchart showing an example of the operation, and FIGS. 6 and 7 are a plan view and a side view showing a warning area.

  As shown in FIG. 1, a passive infrared sensor 1 (referred to as infrared sensor 1) includes a disc-shaped base 2a that is attached to the ceiling or wall surface of a warning area, and a hemisphere that is detachably attached to cover the base 2a. And a housing 2 comprising a ring-shaped locking member 2c for detachably locking the base 2a and the cover 2b to each other.

  As shown in FIG. 2, the infrared sensor 1 includes a detector 3 for the vicinity, an intermediate detector 4, and a remote detector 5 on the disk-shaped base 2 a. The two detectors 3 to 5 are arranged so as to be close to each other and positioned at the apex of the substantially triangle. The detector 3 includes a mirror 3a as an optical system, a pyroelectric element 3b as an infrared detection element, and an amplification / filter unit 3c described later, and the detectors 4 and 5 are mirror housings as an optical system. 4a and 5a, pyroelectric elements 4b and 5b as infrared detection elements, and amplification / filter sections 4c and 54c described later.

  At this time, the detector 4 and the detector 5 are provided side by side in the left-right direction near one end in the diameter direction of the base 2a, and the pyroelectric elements 4b and 5b of the detectors 4 and 5 are on the element substrate 7. Has been implemented. The mirror housings 4a and 5a of the detectors 4 and 5 have a pair of side walls 8a connected to both ends of the element substrate 7, a bottom wall 8b integrally formed at the rear end portion of the side walls 8a, and the like. A plurality of mirrors 8c are formed on the inner surface. Further, the mirror housings 4a and 5a are rotatably attached to a pair of support plates 9 whose side walls 8a are fixed to the base 2a, so that the directions of the mirrors 8c of the detectors 4 and 5 are in a predetermined direction. The infrared rays (heat rays) reflected (condensed) by the mirror 8c are made incident on the pyroelectric elements 4b and 5b.

  The detector 3 is disposed near the other end in the diametrical direction, which is an upper position (lower left position in FIG. 2) of the detectors 4 and 5 on the base 2, and a plurality of mirrors are provided on the base 2a. The mirror 3a is adjustable in angle or arranged at a predetermined angle, and the amplification / filter part 3c is formed on the element substrate 6 ahead of the mirror 3a by a predetermined distance, and the pyroelectric element 3b is mounted. Has been.

  Although not shown, a signal processing unit 11 (to be described later) that processes signals detected by the pyroelectric elements 3b, 4b, and 5b mounted on the element substrates 6 and 7 is formed at a predetermined position of the base 2a. A signal processing board is arranged, and a detection signal or the like is transmitted from a signal processing unit 11 of the signal processing board to a controller (not shown) wirelessly or by wire. Further, as the pyroelectric elements 3b, 4b, and 5b, for example, two pyroelectric elements are differentially connected in series with opposite polarities, and an output signal of a positive (+) polarity pyroelectric element and a minus (-) A multi-element multi-output type capable of obtaining a combined output with an output signal of a polar pyroelectric element is used.

  FIG. 3 shows a block diagram of a control system of the infrared sensor 1. This will be described below. The three detectors 3 to 5 are respectively connected to the signal processing unit 11 (signal processing means) on the signal processing substrate via the amplification / filter units 3c to 5c formed on the element substrates 6 and 7, for example. ing. The amplification / filter units 3c to 5c amplify the detection signals detected by the pyroelectric elements 3b, 4b, and 5b, and filter only the detection signals related to the movement of the heat source by filtering the detection signals. The amplification factor and the frequency characteristic of the filter are set in advance according to the detectors 3 to 5, for example.

  The signal processing unit 11 is formed of, for example, a microcomputer and has a determination unit 11a, a storage unit 11b, and the like, and a setting unit 12 is connected to the input side thereof. The setting unit 12 sets, for example, three setting switches 12a to 12c for invalidating or validating input of detection signals detected by the detectors 3 to 5, and the number of detections of the detectors 3 to 5. The setting switch 12d, the setting switch 12e for setting the sensitivity of each detector 3-5, the setting switch 12f for setting the frequency characteristics of each amplification / filter unit 3c-5c, and whether the human body is compared with the detection signal A setting switch 12g for setting a threshold value (reference value) for determining whether or not.

  Further, on the output side of the signal processing unit 11, from a transmission unit 13a for transmitting the human body detection signal determined by the determination unit 11a to the controller, a setting state by the setting unit 12, for example, a display unit 13b capable of displaying a code The output unit 13 is connected. Further, a predetermined signal corresponding to the operation of the setting switches 12a to 12c and the like is output from the signal processing unit 11 to the amplification / filter units 3c to 5c. The configuration of the setting unit 12 and the output unit 13 is not limited to the illustrated example. For example, an appropriate configuration such as arranging an input keyboard on the setting unit 12 can be used.

  Next, an example of operation | movement of the signal processing part 11 comprised in this way is demonstrated based on the flowchart of FIG.4 and FIG.5. 4 and 5 are automatically executed according to the program stored in the storage unit 11b of the signal processing unit 11. First, the detection times of the detectors 3 to 5 are set as shown in FIG. That is, for example, when the infrared sensor 1 is attached to the ceiling of a room at a warning place and various settings such as setting of a warning area of the infrared sensor 1 are performed, the program starts when the power of the infrared sensor 1 is turned on (S100). Then, it is determined whether or not the setting switch 12d for setting the number of detections by the setting unit 12 is ON (S101). This determination S101 is repeated until “YES”.

  When the setting switch 12d of the setting unit 12 is turned on, “YES” is determined in the determination S101, the detection number n1 of the detector 3 is set (S102), and then the detection number n2 of the detector 4 is set ( S103) and the number of detections n3 of the detector 5 is set (S104). These detection times n1 to n3 are set, for example, by selecting the number of times stored in advance in the storage unit 11b of the signal processing unit 11, or by using a keyboard or the like provided in the setting unit 12 (not shown) for the detection times n1 to n3. It is set to a counter (not shown) provided in the signal processing unit 11 by directly using it, but the specific numerical value (number of times) is obtained in advance by experiments or the like according to the size of the warning area. It is preferable to use data.

  When the detection times n1 to n3 of the three detectors 3 to 5 are set in steps S102 to S104, it is determined whether or not these detection times n1 to n3 are OK (S105), and “YES” is determined in this determination S105. In this case, that is, when the number of detections n1 to n3 of the three detectors 3 to 5 is set to a number within a preset range, the number of detections n1 to n3 of each detector 3 to 5 is stored in the storage unit 11b. The program is stored (106), and the program is terminated (S107).

  On the other hand, if “NO” in the determination S105, that is, if the number of detections n1 to n3 of the detectors 3 to 5 is not an appropriate number in a preset range, for example, the number set in the steps S102 to S105 is used. After resetting (S108), the process returns to step S101, and the subsequent steps are executed to set again the detection times n1 to n3 of the detectors 3 to 5. Note that step S105 and step S108 may be omitted, and if the set number of times n1 to n3 is set, it can be stored as it is and terminated.

  When the detection times n1 to n3 of the detectors 3 to 5 are set in step S106, the signal processing circuit 11 outputs the human body detection signal S as shown in FIG. FIG. 5 mainly describes the detector 3, but the same applies to the detectors 4 and 5. As shown in FIG. 5, when the infrared sensor 1 is installed at a predetermined position and the program is started (S200), it is determined whether or not a detection signal is input from the detector 3 (or the detectors 4 and 5). (S201).

  If “YES” in this determination S201, that is, if the moving object in the warning area crosses one of the plurality of detection zones of the detector 3 and the level of the detection signal is equal to or higher than the threshold, the counter Is counted up (S202), and it is determined whether the count number is the detection number n1 (or n2, n3) (S203). The number of detections n1 used in this determination S203 is the number set in step S102. If the number of detections in step S202 is the number of detections n1, “YES” is determined in determination S203, and the human body detection signal S is output. (S207) and a series of programs are ended (S209).

  On the other hand, if “NO” in the determination S201, that is, if no detection signal is input, it is determined whether a timer (not shown) provided in the signal processing unit 11 is operating (S204), for example. If “YES”, it is determined whether it is within the timer time (S205). If “NO” in this determination S205, the counter is reset and the timer is reset (S206), and the process returns to the determination S201 to wait for the input of the detection signal. Also, if “NO” in the determination S204 and “YES” in the determination S205, the process returns to the determination S201. If “NO” in the determination S203, that is, if the first detection signal is input and the count number has not reached the detection number n1, the timer is started (S208), and the process returns to the determination S201.

  That is, according to these flowcharts, the detection times n1 to n3 of the detectors 3 to 5 are set by turning on the setting switch 12d for setting the detection frequency when the infrared sensor 1 is installed, for example. The number of detections n1 to n3 for each of the devices 3 to 5 is individually set and stored. In the alert state in which the infrared sensor 1 is installed, the human body detection signal S is output when the detectors 3 to 5 detect the detection number n1 to n3 stored in advance corresponding to the alert distance. This is output from the unit 13 to the controller.

  FIG. 6 shows an example of a warning area by the infrared sensor 1. As shown in FIGS. 6 (a) and 6 (b), the detector 3 for the vicinity of the warning distance has the detection zones A1 to A3 in the horizontal plane and the detection zone a in the vertical plane, and the warning distance is for intermediate use. The detector 4 has detection zones B1 to B7 on the horizontal plane and a detection zone b on the vertical plane. Furthermore, the detector 5 for a distant warning distance has detection zones C1 to C7 on the horizontal plane and a detection zone c on the vertical plane. A three-dimensional warning type warning area is formed in the infrared sensor 1 by each of these detection zones.

  The warning area of the infrared sensor 1 of the present invention is not limited to the three-dimensional warning type shown in FIG. As shown in FIG. 7 (b), the surface warning type warning area has detection zones d1 to d6 in the vertical plane, and these detection zones d1 to d6 are shown in FIG. 7 (a). As described above, the detection zones D1 to D6 on the horizontal plane are in a state of about one. In the case of this area alert type alert area, it is used when the alert distance is long.

  Thus, according to the infrared sensor 1 of the said embodiment, the some detectors 3-5 which have the mirror 3a, the mirror housings 4a, 5a, the pyroelectric elements 3b, 4b, 5b, etc. are arrange | positioned closely in the housing 2. FIG. In addition, since the number of detections n1 to n3 of each of the detectors 3 to 5 until the human body detection signal is output from the plurality of detectors 3 to 5 is individually set by the signal processing unit 11, the warning distances are different. The number of detections n1 to n3 of each detector 3 to 5 can be made different, for example, it is possible to reliably detect an intruder (human body) in a remote detection zone while reducing false alarms due to small animals in the detection zone in the vicinity, etc. The infrared sensor 1 can easily obtain highly accurate detection performance regardless of the alert distance.

  In addition, the number of detections n to n3 of the three detectors 3 to 5 can be individually set in the signal processing unit 11 by operating the setting switch 12d provided in the setting unit 12 connected to the signal processing unit 11. In addition, the setting operation of the detection times n1 to n3 can be easily performed, and the installation and maintenance operation of the infrared sensor 1 can be easily performed.

  Further, since the detection signals detected by the three detectors 3 to 5 are individually processed by the signal processing unit 11 by operating the setting switches 12a to 12c of the setting unit 12, the sensitivity of the detectors 3 to 5 is determined. And the frequency characteristics of the amplifying / filter units 3c to 5c are set for each of the detectors 3 to 5, so that the detection performance in the detection zone in the vicinity where the detection distance of the infrared sensor 1 is short and the detection zone in the distance where the detection distance is long Can be suppressed, and a highly accurate alert area can be easily obtained regardless of the alert distance while suppressing the detection performance for small animals.

  In addition, as a warning area of the infrared sensor 1, it is applied to a three-dimensional warning type warning area composed of detection zones A1 to A3, B1 to B7, C1 to C7 in the horizontal plane and detection zones a to c in the vertical plane. If each detector 3-5 is arrange | positioned corresponding to the fan-shaped several detection zone by side view, the infrared rays radiated | emitted from an intruder (human body) can be detected reliably irrespective of a warning distance. In addition, d1 to d6 are provided on the vertical plane, and these are applied to a surface warning type warning area in which about one is arranged on the horizontal plane. If the detectors 3 to 5 are arranged, the infrared rays emitted from the intruder can be reliably detected, and the detection performance of the infrared sensor 1 can be further enhanced.

  Further, since the warning distances of the three detectors 3 to 5 are set near, middle, and far and are arranged in a substantially triangular shape on the disc-like base 2a of the housing 2, the warning distances 3 differ. Each detector zone can be detected by the three detectors 3 to 5, and a more accurate warning area can be obtained, and the arrangement of the three detectors 3 to 5 in the housing 2 can be performed efficiently. Thus, a small and high-performance infrared sensor 1 can be obtained. Furthermore, since the mirror 3a is used for the detector 3 and the mirror housings 4a and 5a are used for the detectors 4 and 5, an optimal optical system can be used for each of the detectors 3 to 5 having different warning distances. While the detection performance in each detector 3-5 can be improved further, the cost increase of infrared sensor 1 itself can be suppressed.

  Further, the detection signals of the three detectors 3 to 5 can be individually processed by operating the setting switches 12a to 12c of the setting unit 12, or the sensitivity and frequency characteristics can be adjusted by operating the setting switches 12e and 12f. Since it can be set for each of the detectors 3 to 5, when it is desired to be alert for a range with a relatively short alert distance, the detector 5 is disabled (unusable), or there is a heat source that causes false alarms such as FAX near the infrared sensor 1. In some cases, such as disabling the detector 3, the three detectors 3 to 5 can be appropriately selected and used in accordance with the form of the alert state of the alert area, so that various types of alert areas can be handled accurately and easily. It becomes possible.

  Furthermore, since the warning area is covered in a separated state by the detectors 3 to 5 provided in the infrared sensor 1, when adjusting the direction of the detectors 3 to 5 for setting the warning distance, detection in the vicinity of the sensor is performed. In addition to eliminating the need to consider the effects on the zone, the detection zones each of the detectors 3 to 5 are easier to understand than in the case of a conventional integrated optical system detector. When there is a heat source that causes false alarms such as masking the detection zone of the part, the work can be easily performed. From these, the work efficiency of the installation work and maintenance work of the infrared sensor 1 can be improved. Improvements can be made.

  Here, like the infrared sensor 1 according to the present invention, the feature of the infrared sensor 1 of the perspective separation type in which the detector is separated into a plurality corresponding to the distance of the warning distance is as follows. This will be described with reference to FIGS. 8 and 9 and the like while comparing with one integrated infrared sensor. 8 and 9 show the state of the detection zone when the infrared sensor having the detection zone as shown in FIG. 7 is adjusted by the warning distance adjustment method of the method according to the present invention and the warning distance adjustment method of the conventional method. Show. As shown in FIG. 8, in the case of the perspective separation type infrared sensor 1, for example, there is almost no relative change in the width of each detection zone d <b> 1 to d <b> 4 that forms a surface warning type warning area, and the outer periphery of the warning area is When trying to change the angle of the distant detector for regulation, the width of the distant warning zone d4 becomes small like d1-1, d4-2, but almost changes in the nearby detection zones d1, d2, etc. There is no need to let them.

  On the other hand, in the case of the conventional infrared sensor shown in FIG. 9, a large relative change occurs in the widths of the detection zones e1 to e6, and the detection zones e1 and the like in the vicinity are too large for the intruder. The zone e6 and the like are smaller with respect to the intruder, and there is no difference between the ratio of the projected area of the small animal and the ratio of the projected area of the intruder to the detection zone e1, so the nearby detection zone e1 and the like Increasing the sensitivity of the detector for detecting intruders in the country may detect distant small animals and cause false alarms.

  That is, in the perspective separation type infrared sensor 1, the warning area is separated into a plurality of independent detectors, so that a detector that warns far away does not need to have a nearby detection zone. Therefore, even if the angle of the detector that guards the distance is adjusted to shorten the longest warning distance, it will not be changed to the angle of the nearby detection zone as in the past, and as a result, the size of the detection zone In particular, the balance of the size of the detection zones in the distance and the vicinity is small, and it is difficult to fall into a state that cannot be covered with the frequency characteristics set for each detector with respect to the moving speed of the detection target. In addition, since the detectors are separate for the distant and the vicinity, false alarms caused by small animals in the distant detection zone can be reduced by reducing the sensitivity of only the distant detector.

  Furthermore, since the detector of the infrared sensor 1 has a plurality of detectors, even if the detection zone of the detector that warns the distance and the detection zone of the detector that warns the vicinity overlap, a heat source (moving object) that enters there Are detected without being affected by each other in each detector, and if necessary, it is judged as a single independent signal from multiple detectors, or it is judged by calculation processing. It can be handled as a single detector. For example, if the number of detections (pulse count number) is set to a certain value across multiple detectors, the detection zones in the vicinity, which usually tend to be dense and have a high number of detections, do not overlap and are detected on the far side. Since the zones overlap, the number of detections tends to be more uniform with respect to the movement distance of the heat source regardless of the location in the alert area. Moreover, since the detection frequency can be set independently for each detector, the detection performance in the alert area can be made more uniform.

  On the other hand, in the conventional infrared sensor, the angles of all the detection zones are changed, and if the optical system that warns the distance and the optical system that warns the vicinity are separated without making the detector independent. Even if there is, in that method, if the angle of only the optical system that guards the distance is adjusted to shorten the longest guard distance, the detection zone of the optical system that guards the distance and the detection zone of the optical system that guards the vicinity When overlapped, the overlapping detection zone becomes more sensitive than the non-overlapping detection zone, and even if a disturbance element with relatively low energy is applied to the intruder, such as a small animal, the alert threshold A detection signal exceeding 1 can be obtained, which may cause false alarms.

  Furthermore, in the far-infrared separation type infrared sensor 1, since a plurality of detectors are independent, for example, when the focal length of an optical system that forms a far detection zone is made shorter than before in order to reduce the size, for example. Thus, the amplification factor of the detector that forms the distant detection zone can be increased without affecting the detector that forms the detection zone in the vicinity, thereby reducing the size without degrading the detection performance.

  In contrast, conventional infrared sensors tend to have lower sensitivity because the detection zone in the distance is larger and lower in sensitivity, but the detection zone in the vicinity tends to be smaller and higher in sensitivity. For the collapse, some adjustments were made by changing the aperture of the optical system forming the detection zone to achieve a balance. However, in order to reduce the detection zone that tends to be large when forming a remote detection zone, in an optical system that takes a long focal length, the sensitivity tends to be low, so it is required to further increase the aperture. This is in conflict with the downsizing of existing sensors, and it is difficult to perform sufficient adjustment. Thus, it can be said that the infrared sensor 1 according to the present invention has many advantages over the conventional infrared sensor.

  In the above embodiment, the detectors 3 to 5 are arranged in a substantially triangular shape in the housing 2 as three detectors 3 to 5 having a warning distance in the vicinity, middle and distance, but the present invention has this configuration. For example, two detectors for near and far warning distances can be arranged on the base 2 in the upper and lower positions in the diametrical direction or in the left and right positions in the diametrical direction. It is also possible to arrange the vessels in a predetermined arrangement. In the above embodiment, the number of detectors, the form of the optical system, the structure of the base and cover of the infrared sensor, the block diagram of the control system, etc. are only examples. For example, a lens is used as the optical system. The present invention can be changed as appropriate without departing from the gist of the invention.

  The present invention is not limited to a passive infrared sensor in which a plurality of detectors are arranged on a disk-shaped base, but a plurality of detectors each including an infrared detection element and an optical system are arranged in a casing having a base having various shapes. It can be used for all passive infrared sensors.

The perspective view which shows one Embodiment of the passive type infrared sensor concerning this invention Conceptual diagram showing the internal configuration Block diagram of the control system Flow chart showing an example of the operation Flow chart showing an example of other operations Plan view and side view showing the three-dimensional warning type warning area Plan view and side view of the same area Explanatory drawing of the warning area of the perspective separation type infrared sensor Explanatory drawing of warning area of conventional infrared sensor

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Passive infrared sensor, 2 ... Housing, 2a ... Base, 2b ... Cover, 3-5 ... Detector, 3a ... Mirror, 3b ... Pyroelectric element, 3c: amplification / filter unit, 4a, 5a ... mirror housing, 4b, 5b ... pyroelectric element, 4c, 5c ... amplification / filter unit, 6, 7 ... element substrate, 8c ..Mirror, 9 ... support plate, 11 ... signal processing unit, 11a ... determining unit, 11b ... storage unit, 12 ... setting unit, 12a-12g ... setting switch, 13 ... Output unit, S ... Human body detection signal, n1 to n3 ... Number of detections.

Claims (2)

An optical system for collecting infrared rays in a warning area composed of a plurality of detection zones, and a detector having an infrared detection element for detecting infrared rays collected by the optical system; In a passive infrared sensor comprising a signal processing means for processing a detection signal detected by the detector,
The detector includes a plurality of detectors each having the optical system and an infrared detection element and arranged close to each other so as to be individually adjustable in angle, and the signal processing means includes the plurality of detectors. When the human body is detected by any one of the detectors and the human body detection signal can be output when each of the signals detected in step S1 is detected, the plurality of detectors can output the human body detection signal. A passive infrared sensor characterized in that the number of detections can be set individually.   2. The signal processing unit can individually set the number of detections of the plurality of detectors by operating a setting switch provided in a setting unit connected to the signal processing unit. Passive infrared sensor.

Images