Object detection device

Abstract

Reduce the risk of false reports. [Solution] The object detection device 1 includes a pyroelectric sensor 6 that detects far-infrared rays emitted from an object within a monitoring range, an electrostatic sensor 10 provided on the object detection device 1 such that the capacitance measuring electrode 10a overlaps with the detection area of ​​the pyroelectric sensor 6, and which detects capacitance associated with the approach of an object within a monitoring range by a mutual capacitance measurement method or a self-capacitance measurement method, a vibrating element 11 that vibrates the cover 3 of the object detection device 1, and a control unit 7 that controls the vibrating element 11 to vibrate the cover 3 when, within a first set time range after the pyroelectric sensor 6 has changed from normal to output determination, or after the electrostatic sensor 10 has changed from normal to detection, the pyroelectric sensor 6 is in the output determination state and the detection state of the electrostatic sensor 10 continues for a second set time or longer, or when the pyroelectric sensor 6 has confirmed human detection and the detection state of the electrostatic sensor 10 continues for a second set time or longer.

Description

[Technical Field]

[0001] The present invention relates to an object detection device for detecting the intrusion of an object into a monitoring range. [Background technology]

[0002] Conventionally, various forms of object detection devices are known for detecting the intrusion of objects into a monitoring range. In particular, regarding object detection devices using pyroelectric elements, the applicant has already filed an application for an object detection device disclosed in Patent Document 1 below, which has a function to eliminate false alarms caused by insects in the immediate vicinity.

[0003] The object detection device disclosed in Patent Document 1 detects whether an object entering the monitoring range is a human body or not, and in order to reduce false alarms caused by insects flying nearby, it has a configuration that incorporates a pyroelectric infrared sensor and optical system within an infrared-transmitting cover, as well as a capacitance sensor including a capacitance measuring electrode set to overlap the monitoring range, and measures the capacitance of the capacitance measuring area. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2024-137030 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, in the object detection device disclosed in Patent Document 1 mentioned above, the capacitance measured by the capacitance sensor may change due to factors other than insects crawling on the outer surface of the cover (such as ambient noise, device malfunction, or plotting), which could lead to a certain risk of false alarms.

[0006] Therefore, the present invention has been made in view of the above problems, and aims to provide an object detection device that can further reduce the risk of false alarms. [Means for solving the problem]

[0007] To achieve the above-mentioned objective, the object detection device according to the present invention is an object detection device that detects an object entering a monitoring range, A pyroelectric infrared sensor that detects far-infrared radiation emitted from an object within the monitoring range at a predetermined distance from the object detection device, A capacitance measuring electrode formed of the far-infrared-transmitting material is provided on the object detection device so as to overlap with the detection area of ​​the pyroelectric infrared sensor, and the capacitance sensor detects the capacitance associated with the approach of an object within the monitoring range by a mutual capacitance measurement method or a self-capacitance measurement method. A vibrating element that vibrates the cover of the object detection device, Within a first set time range after the pyroelectric infrared sensor changes from normal to output determination, or after the capacitance sensor changes from normal to detection, when the pyroelectric infrared sensor is in the output determination state and the capacitance sensor is in the detection state for a second set time or longer, or when the pyroelectric infrared sensor confirms human detection and the capacitance sensor is in the detection state for a second set time or longer, the control unit controls the vibrating element to vibrate the cover, and determines whether the object is a human body or not based on the confirmed human body detection state of the pyroelectric infrared sensor and the detection state of the capacitance sensor after the vibration of the cover by the vibrating element. It is characterized by having the following features.

[0008] Furthermore, the object detection device according to the present invention is an object detection device that detects an object entering the monitoring range, A pyroelectric infrared sensor that detects far-infrared radiation emitted from an object within the monitoring range at a predetermined distance from the object detection device, A capacitance measurement electrode formed of the material that transmits far-infrared rays is provided in the object detection device so as to overlap with a detection region of the pyroelectric infrared sensor, and the capacitance sensor detects capacitance caused by approach of an object within the monitoring range by a mutual capacitance measurement method or a self-capacitance measurement method; a vibration element that vibrates a cover of the object detection device; a control unit that controls the vibration element to vibrate the cover when the capacitance sensor continuously detects a capacitance for a third set time or longer in a state where there is no output from the pyroelectric infrared sensor, and determines whether the device is abnormal based on a detection state of the capacitance sensor after the cover is vibrated by the vibration element; characterized by comprising: Effects of the Invention

[0009] According to the present invention, the risk of a failure to report when the capacitance measured by the capacitance sensor changes due to an abnormality of the device, including a state where human body detection cannot be normally performed, specifically an abnormality caused by ambient noise, an abnormality caused by device failure, an abnormality caused by sabotage such as attaching a shielding object to the device, and an abnormality caused by insects adhering to the device that cannot be removed even by vibration from the vibration element, can be reduced. Brief Description of the Drawings

[0010] [Figure 1] It is a side cross-sectional view showing the schematic configuration of the object detection device according to the present invention. [Figure 2] It is a functional block diagram of the object detection device according to the present invention. [Figure 3] It is an example of a timing chart based on condition 1 by the object detection device according to the present invention. [Figure 4] It is another example of a timing chart based on condition 1 by the object detection device according to the present invention. [Figure 5] It is an example of a timing chart based on condition 2 by the object detection device according to the present invention. [Figure 6] It is another example of a timing chart based on condition 2 by the object detection device according to the present invention. [Modes for carrying out the invention]

[0011] The embodiments for carrying out the present invention will be described in detail below with reference to the attached drawings.

[0012] [About the configuration of the object detection device] Figure 1 is a side cross-sectional view showing a schematic configuration of the object detection device according to the present invention, and Figure 2 is a functional block diagram of the object detection device.

[0013] As shown in Figures 1 and 2, the object detection device 1 of this embodiment has a base 2 fixed to, for example, the ceiling or wall surface of the monitoring range, and a cover 3 is detachably attached to the base 2 to form a housing 4. Inside the housing 4 of the object detection device 1 are a mirror 5 as an optical system, a circuit board 8 to which a pyroelectric infrared sensor 6 and a control unit 7 are wired and connected, and a capacitance sensor 10 to which an electrode 10a for capacitance measurement is wired and connected to the circuit board 8 via a connector 9. Furthermore, a vibration element 11, which is wired and connected to the circuit board 8, is provided inside the housing 4 in contact with the inner surface of the cover 3.

[0014] The pyroelectric infrared sensor 6 detects far-infrared radiation emitted from an object moving within a monitoring range H1 at a predetermined distance from the housing 4 of the object detection device 1, and is composed of a pyroelectric element 6a, an amplification unit 6b, and an A / D conversion unit 6c.

[0015] The pyroelectric element 6a detects far-infrared radiation emitted from an object moving within a monitoring range H1 at a predetermined distance from the housing 4 of the object detection device 1, and outputs a detection signal corresponding to the amount of change in the detected far-infrared radiation to the amplification unit 6b.

[0016] The amplification unit 6b amplifies the detection signal from the pyroelectric element 6a at a predetermined amplification factor and outputs it to the A / D conversion unit 6c.

[0017] The A / D conversion unit 6c performs A / D conversion on the detection signal, which is an analog value amplified by the amplification unit 6b, at a predetermined sampling period, and outputs it to the control unit 7 as a detection signal d1 in digital value.

[0018] The pyroelectric infrared sensor 6 only needs to be configured to detect far-infrared rays emitted from an object moving within the monitoring range H1, and can employ any of the conventionally known twin-mirror method, dual-twin method, or a combination thereof. In the example in Figure 1, for the sake of explanation, the monitoring range H1 is virtually set up as a single detection space, projected from the pyroelectric infrared sensor 6 via the mirror 5 onto a monitoring plane (including a roughly horizontal plane) such as the floor of a building, but it is not limited to this. For example, the mirror surface of one mirror 5 can be divided into multiple sections, and the monitoring range H1 projected onto the monitoring plane can be divided into multiple detection spaces according to the number of divisions of the mirror 5, and the number, size, and distribution of detection spaces in the monitoring range H1 can be arbitrarily set.

[0019] The capacitance sensor 10 detects the capacitance associated with the approach of an object within the monitoring range H1 using either a mutual capacitance measurement method or a self-capacitance measurement method, and is configured to include a capacitance measuring electrode 10a and a capacitance measuring unit 10b.

[0020] The capacitance measuring electrode 10a is made of a far-infrared-transmitting material and is positioned on the inner surface of the cover 3 of the object detection device 1 such that the capacitance measuring area E2 on the outer surface of the cover 3, shown by the thick line in Figure 1, encompasses and overlaps with the detection area E1 of the pyroelectric infrared sensor 6, which is projected onto the outer surface of the cover 3 from at least the monitoring range H1 shown by the dotted line in Figure 1.

[0021] The capacitance measuring electrode 10a is wired and connected to the circuit board 8 inside the housing 4 via a connector 9. The capacitance sensor 10 is capable of measuring the capacitance formed between the capacitance measuring electrode 10a and the ground, or between the transmitting electrode and the receiving electrode of the capacitance measuring electrode 10a.

[0022] The capacitance measuring electrode 10a can be attached to the cover 3, or coated with conductive paint, but is not limited to these methods. For example, the metal-plated mirror 5 that constitutes the optical system can also be used as the capacitance measuring electrode 10a.

[0023] When a mutual capacitance measurement method is adopted, the capacitance measurement unit 10b measures the capacitance formed between the transmitting electrode and the receiving electrode of the capacitance measurement electrode 10a and outputs a detection signal d2 of the measured capacitance as a digital value to the control unit 7. Furthermore, when a self-capacitance measurement method is adopted, the capacitance measurement unit 10b measures the capacitance formed between the capacitance measurement electrode 10a and the ground and outputs a detection signal d2 of the measured capacitance as a digital value to the control unit 7.

[0024] The vibration element 11 is provided to vibrate the cover 3 and remove insects that crawl on the outer surface of the cover 3. The vibration element 11 is made up of, for example, a piezoelectric element, and is attached in contact with the inner surface of the cover 3 for safety reasons to avoid external interference, and is wired to the circuit board 8 inside the housing 4. When the following preset conditions 1 or 2 are met, the vibration element 11 is driven to vibrate for a set vibration time ts (for example, 10 seconds) by the control of the boost oscillator 12 via the control unit 7, causing the cover 3 to vibrate.

[0025] Condition 1 for driving the vibration element 11 is that, within a first set time ta (e.g., 15 seconds) after the pyroelectric infrared sensor 6 changes from normal to output determination, or after the capacitive sensor 10 changes from normal to detection, the pyroelectric infrared sensor 6 is in output determination or human detection confirmed and the state of detection of the capacitive sensor 10 continues for a second set time tb (e.g., 5 seconds) or longer.

[0026] Condition 2 for driving the vibration element 11 is when the capacitive sensor 10 continuously detects for a third set time tc (for example, 60 seconds) or longer, while there is no output from the pyroelectric infrared sensor 6.

[0027] For example, a haptic driver for a piezoelectric element can be used as the boost oscillator 12. Furthermore, it is preferable that the vibrating element 11 vibrates in a way that effectively removes insects present on the surface of the cover 3, and is not limited to a constant vibration period. The vibration period may be randomly varied, or the vibration intensity may be varied.

[0028] The control unit 7 receives the detection signal d1 of the pyroelectric infrared sensor 6 and the detection signal d2 of the capacitance sensor 10 as inputs, executes processing based on the timing charts of FIGS. 3 to 6 described later, determines the presence or absence of an object within the monitoring range H1, and controls human body detection abnormality output and failure / self-diagnosis abnormality output according to the determination result, and is generally configured to include a storage unit 7a, a capacitance average value calculation unit 7b, a determination unit 7c, and an output unit 7d.

[0029] The storage unit 7a stores various types of information necessary for processing based on the timing charts of FIGS. 3 to 6 described later. Specifically, the threshold V for determining whether or not there is movement of a heat source in the monitoring range H1 by comparison with the amount of far infrared rays based on the detection signal d1 of the pyroelectric infrared sensor 6 th , the capacitance C based on the current detection signal d2 of the capacitance sensor 10 and the average capacitance value C calculated by the capacitance average value calculation unit 7b avg the absolute value of the difference |C-C avg |=ΔC, the threshold C for comparison th , processing results, and the like are stored therein.

[0030] The capacitance average value calculation unit 7b calculates the average capacitance value C based on the detection signal d2 of the capacitance sensor 10 avg . This average capacitance value C avg can be, for example, the average value of capacitance C based on the detection signals d2 of the capacitance sensor 10 in a predetermined period going back a predetermined time from the current time (the latest average value), or the average value of capacitance C based on the detection signals d2 of the capacitance sensor 10 from the activation of the object detection device 1 to the current time.

[0031] The determination unit 7c shifts to output determination when there is a change in the detection signal d1 of the pyroelectric infrared sensor 6. The determination unit 7c also calculates the absolute value of the difference between the capacitance C based on the current detection signal d2 of the capacitance sensor 10 and the average capacitance value C calculated by the capacitance average value calculation unit 7b avg |C-C avg |=ΔC and compares ΔC with the threshold C th , and compares ΔC with the threshold C thThe system determines whether the result is above or below the specified threshold, and then makes an overall determination based on the timing charts in Figures 3 to 6, taking into account the determination result of the capacitance sensor 10.

[0032] The determination unit 7c determines whether the output from the pyroelectric infrared sensor 6 is normal or below the threshold V. th If it exceeds a certain amount of time, a threshold V is reached based on a fixed pattern. th When the output exceeds a certain threshold, a flag is set to confirm human detection, and the output from the output unit 7d is held in abeyance. The determination unit 7c determines that the ΔC from the capacitance sensor 10 is equal to the threshold C. th When the above conditions are met, the capacitance sensor 10 is determined to have detected an event.

[0033] The output unit 7d outputs a signal corresponding to the result of the overall determination by the determination unit 7c. Specifically, based on the timing charts shown in Figures 3 to 6, which will be described later, it outputs a human body detection abnormality when pattern 3, pattern 4, or pattern 7 occurs, and outputs a planning / self-diagnosis abnormality when pattern 9 occurs.

[0034] Next, the operation of the object detection device 1 configured as described above will be explained with reference to the timing charts in Figures 3 to 6. In Figures 3 to 6, "pyroelectric infrared sensor" is abbreviated as "pyroelectric sensor," and "capacitive sensor" is abbreviated as "electrostatic sensor." Also, patterns 1 to 9 shown in the timing charts in Figures 3 to 6 are examples of the operation of the object detection device 1 of this embodiment, and are not limited to these patterns.

[0035] [Pattern 1] In Pattern 1, as shown in Figure 3, the output of the pyroelectric sensor 6 (far-infrared radiation amount based on the detection signal d1) exceeds a certain time threshold V from normal. th Since it does not exceed the threshold, it does not transition during output determination. Then, the pyroelectric sensor 6 does not transition during output determination and the threshold V is determined by a fixed pattern within the first set time ta. th Since there is no overload and the electrostatic sensor 10 remains normal with no detection, the vibration element 11 is not driven to vibrate and remains stopped, and the determination unit 7c determines that there is no confirmed human body detection by the pyroelectric sensor 6 (no detection) and no detection by the electrostatic sensor 10.

[0036] [Pattern 2] In Pattern 2, as shown in Figure 3, the output of the pyroelectric sensor 6 (far-infrared radiation amount based on the detection signal d1) exceeds a certain time threshold V from normal. th Because it exceeds the limit, it transitions to output judgment mode. Then, within the first set time ta, after the pyroelectric sensor 6 transitions to output judgment mode, a threshold V is determined by a fixed pattern. th Since there is no overload and the electrostatic sensor 10 remains normal with no detection, the vibration element 11 remains stopped without being driven to vibrate, similar to pattern 1. The determination unit 7c determines that there is no confirmed human body detection by the pyroelectric sensor 6 (no detection) and no detection by the electrostatic sensor 10.

[0037] [Pattern 3] In Pattern 3, as shown in Figure 3, the output of the pyroelectric sensor 6 (far-infrared radiation amount based on the detection signal d1) is normal to threshold V th The threshold V is exceeded and the system transitions to output determination mode. Then, within the first set time ta after the pyroelectric sensor 6 transitions to output determination mode, a threshold V is determined by a fixed pattern. th Since there is an excess, the determination unit 7c sets a flag confirming human body detection by the pyroelectric sensor 6. Then, a threshold V is set based on a pattern determined within the first set time ta after the pyroelectric sensor 6 has entered the output determination state. th Although there is an overload, the electrostatic sensor 10 remains normal and does not detect anything, so the vibration element 11 does not engage and remains stopped. However, the determination unit 7c has set the flag indicating that human body detection has been confirmed by the pyroelectric sensor 6, so the output unit 7d outputs a human body detection abnormality at the timing when the flag indicating human body detection by the pyroelectric sensor 6 falls.

[0038] [Pattern 4] In Pattern 4, as shown in Figure 3, the output of the pyroelectric sensor 6 (far-infrared radiation amount based on the detection signal d1) is normal to threshold V th The threshold V is exceeded and the system transitions to output determination mode. Then, within the first set time ta after the pyroelectric sensor 6 transitions to output determination mode, a threshold V is determined by a fixed pattern. thSince there is an excess, the determination unit 7c sets a flag confirming human body detection by the pyroelectric sensor 6. Also, when the pyroelectric sensor 6 transitions to output determination mode, the electrostatic sensor 10 changes from normal to detected mode. Then, within the first set time ta from when the pyroelectric sensor 6 transitions to output determination mode, a threshold V based on a predetermined pattern is set. th Although there is an excess, the detection state of the electrostatic sensor 10 is less than the second set time tb, so the vibration element 11 does not engage and remains stopped. The determination unit 7c determines that the detection by the electrostatic sensor 10 is abnormal due to factors other than insects (such as ambient noise) because the change in capacitance of the electrostatic sensor 10 is small. However, since the flag confirming human body detection by the pyroelectric sensor 6 is set, the output unit 7d outputs a human body detection abnormality at the timing when the flag confirming human body detection by the pyroelectric sensor 6 falls.

[0039] [Pattern 5] In Pattern 5, as shown in Figure 4, the output of the pyroelectric sensor 6 (far-infrared radiation amount based on the detection signal d1) is normal to threshold V th The threshold V is exceeded and the system transitions to output determination mode. Then, within the first set time ta after the pyroelectric sensor 6 transitions to output determination mode, a threshold V is determined by a fixed pattern. th Since there is an excess, the determination unit 7c sets a flag confirming human body detection by the pyroelectric sensor 6. Also, when the pyroelectric sensor 6 transitions to output determination mode, the electrostatic sensor 10 changes from normal to detected mode. Then, within the first set time ta from when the pyroelectric sensor 6 transitions to output determination mode, a threshold V based on a predetermined pattern is set. th Since there is an overload and the detection state of the electrostatic sensor 10 is longer than the second set time tb, the vibration element 11 is driven to vibrate for the set vibration time ts from the moment the second set time tb has elapsed, causing the cover 3 to vibrate. Then, because the electrostatic sensor 10 changes from detection to normal due to the vibration of the cover 3, the determination unit 7c determines that the flag confirming human body detection by the pyroelectric sensor 6 is set and that the change from detection to normal in the electrostatic sensor 10 was caused by an insect nearby the sensor. It cancels the flag confirming human body detection by the pyroelectric sensor 6 and cancels the human body detection abnormality output from the output unit 7d that had been held back (a countermeasure against false alarms caused by insects wandering nearby the sensor).

[0040] [Pattern 6] In pattern 6, as shown in Figure 4, the output of the pyroelectric sensor 6 (far-infrared radiation amount based on the detection signal d1) is normal to threshold V th The threshold V is exceeded and the system transitions to output determination mode. Then, within the first set time ta after the pyroelectric sensor 6 transitions to output determination mode, a threshold V is determined by a fixed pattern. th Since there is an excess, the determination unit 7c sets a flag confirming human body detection by the pyroelectric sensor 6. Also, when the pyroelectric sensor 6 transitions to output determination mode, the electrostatic sensor 10 changes from normal to detected mode. Then, within the first set time ta from when the pyroelectric sensor 6 transitions to output determination mode, a threshold V based on a predetermined pattern is set. th Since there is an excess and the intermittent detection state of the electrostatic sensor 10 (tb1+tb2=tb) is greater than or equal to the second set time tb, the vibration element 11 is driven to vibrate for the set vibration time ts from the moment the second set time tb has elapsed, causing the cover 3 to vibrate. Then, because the electrostatic sensor 10 has changed from detection to normal due to the vibration of the cover 3, the determination unit 7c determines, similar to pattern 5, that the flag confirming human body detection by the pyroelectric sensor 6 is set and that the change from detection to normal in the electrostatic sensor 10 was caused by an insect nearby the sensor. It cancels the flag confirming human body detection by the pyroelectric sensor 6 and cancels the human body detection abnormality output from the output unit 7d that had been held back (a countermeasure against false alarms caused by insects wandering nearby the sensor).

[0041] [Pattern 7] In pattern 7, as shown in Figure 4, the electrostatic sensor 10 changes from normal to detection. Then, within the first set time ta after the electrostatic sensor 10 changes to detection, the output of the pyroelectric sensor 6 (far-infrared amount based on the detection signal d1) changes from normal to threshold V th If the threshold is exceeded, the process transitions to output determination, and a threshold V is determined by a fixed pattern within the first set time ta. th Since there is an excess, the determination unit 7c sets a flag confirming human body detection by the pyroelectric sensor 6. Then, a threshold V is set based on a pattern determined within the first set time ta after the electrostatic sensor 10 changes to detection. thSince there is an overrun and the detection state of the electrostatic sensor 10 is longer than the second set time tb, the vibration element 11 is driven to vibrate for the set vibration time ts from the moment the second set time tb has elapsed, causing the cover 3 to vibrate. However, even after the cover 3 is vibrated, the electrostatic sensor 10 does not return to normal detection, so the determination unit 7c determines that the detection by the electrostatic sensor 10 is an abnormality of the device (a state in which human body detection cannot be performed normally, due to ambient noise, device malfunction, manipulation such as attaching shielding to the device, or an abnormality due to an insect stuck to the device that does not fly away even with vibration by the vibration element 11), and also determines that the human body detection confirmation flag by the pyroelectric sensor 6 is set because it is due to a human body, and the output unit 7d outputs a manipulation / self-diagnosis abnormality output and a human body detection abnormality output at the timing when the human body detection confirmation flag by the pyroelectric sensor 6 falls (measures against false alarms due to device abnormality). After the manipulation / self-diagnosis abnormality output and the human body detection abnormality output, the count of the first set time ta is restarted.

[0042] [Pattern 8] In pattern 8, as shown in Figure 5, the output of the pyroelectric sensor 6 (far-infrared radiation amount based on the detection signal d1) is normal to threshold V th In a state with no overload whatsoever (no pyroelectric output, no output judgment, no confirmed human body detection), the time since the electrostatic sensor 10 changed from normal to detected and the detection time continued for the third set time tc, the vibration element 11 is driven to vibrate for the vibration set time ts from the moment the third set time tc has elapsed, causing the cover 3 to vibrate. Then, since the output of the electrostatic sensor 10 changed to normal during the vibration of the cover 3, the judgment unit 7c determines that the insect that was stuck to the cover 3 has flown away due to the vibration of the cover 3 and the system has recovered, and returns to the normal monitoring state (measure against false alarms due to insects sticking to the cover).

[0043] [Pattern 9] In pattern 9, as shown in Figure 6, the output of the pyroelectric sensor 6 (far-infrared radiation amount based on the detection signal d1) is normal to threshold V thIn a state with no overload whatsoever (no pyroelectric output, no output judgment, no confirmed human body detection), the time since the electrostatic sensor 10 changed from normal to detected and the detection time continued for the third set time tc, similar to pattern 8, the vibration element 11 is driven to vibrate for the vibration set time ts from the moment the third set time tc has elapsed, causing the cover 3 to vibrate. After the cover 3 has vibrated, the output of the electrostatic sensor 10 does not change to normal and continues to be in a detected state, so the judgment unit 7c determines that the detection by the electrostatic sensor 10 is an abnormality in the device (a state in which human body detection cannot be performed normally, an abnormality due to ambient noise, device malfunction, an abnormality due to manipulative actions such as attaching shielding objects to the device, or an abnormality due to insects stuck to the device that do not fly away even with vibration by the vibration element 11), and the output unit 7d outputs a manipulative / self-diagnostic abnormality at the timing when the vibration set time ts has elapsed (measures against false alarms due to device abnormality).

[0044] As described above, this embodiment uses a pyroelectric infrared sensor 6 and a capacitive sensor 10 in combination, and is configured to include a vibration element 11 that vibrates a cover 3 attached to the base 2 of the object detection device 1.

[0045] Then, within the first set time ta range after the pyroelectric infrared sensor 6 changes from normal to output determination, or after the capacitive sensor 10 changes from normal to detection, if the pyroelectric infrared sensor 6 remains in the output determination state and the capacitive sensor 10 remains in the detection state for a second set time tb or longer, or if human detection is confirmed (flag is set) and the capacitive sensor 10 remains in the detection state for a second set time tb or longer (condition 1), the vibration element 11 is driven to vibrate the cover 3.

[0046] Alternatively, when the capacitive sensor 10 detects continuously for a third set time tc or longer while the pyroelectric infrared sensor 6 is not outputting (condition 2), the vibration element 11 is driven to vibrate the cover 3.

[0047] Then, after vibrating the cover 3 for the set vibration time ts, the system comprehensively determines whether the object is a human body or not, or whether the device is malfunctioning (unable to properly detect a human body), based on the human detection confirmation flag of the pyroelectric infrared sensor 6 and the detection status of the capacitance sensor 10, and controls the abnormal output. This not only prevents false alarms caused by insects wandering near the sensor, as in patterns 5 and 6 described above, but also reduces the risk of missed alarms when the capacitance measured by the capacitance sensor 10 changes due to a device malfunction (a state where human body detection cannot be properly performed, caused by ambient noise, device failure, actions such as attaching shielding objects to the device, or insects that do not fly away even when vibrated by the vibration element).

[0048] The best mode of the object detection device according to the present invention has been described above, but the present invention is not limited by this description and drawings. That is, other modes, examples, and operational techniques based on this mode, as made by those skilled in the art, are all included in the scope of the present invention. [Explanation of Symbols]

[0049] 1. Object detection device 2 bases 3 Cover 4 cabinets 5 Mirror 6. Pyroelectric infrared sensor 6a Pyroelectric element 6b Amplification section 6c A / D conversion section 7 Control Unit 7a Storage section 7b Capacitance Average Value Calculation Unit 7c Judgment part 7d Output section 8 circuit boards 9 connectors 10 Capacitive Sensors 10a Electrode for capacitance measurement 10b Capacitance measurement section 11. Vibration element 12 Boost Oscillator H1 Monitoring range E1 Pyroelectric infrared sensor detection area E2 Capacitance measurement area d1 Pyroelectric infrared sensor detection signal d2 Capacitive sensor detection signal ts vibration setting time ta First setting time tb, tb1+tb2 Second setting time tc Third setting time

Claims

1. In an object detection device that detects objects entering the monitoring range, A pyroelectric infrared sensor detects far-infrared radiation emitted from an object within the monitoring range at a predetermined distance from the object detection device. A capacitance measuring electrode formed of the far-infrared-transmitting material is provided on the object detection device so as to overlap with the detection area of ​​the pyroelectric infrared sensor, and the capacitance sensor detects the capacitance associated with the approach of an object within the monitoring range by a mutual capacitance measurement method or a self-capacitance measurement method. A vibrating element that vibrates the cover of the object detection device, Within a first set time range after the pyroelectric infrared sensor changes from normal to output determination, or after the capacitance sensor changes from normal to detection, when the pyroelectric infrared sensor is in the output determination state and the capacitance sensor is in the detection state for a second set time or longer, or when the pyroelectric infrared sensor confirms human detection and the capacitance sensor is in the detection state for a second set time or longer, the control unit controls the vibrating element to vibrate the cover, and determines whether the object is a human body or not based on the confirmed human body detection state of the pyroelectric infrared sensor and the detection state of the capacitance sensor after the vibration of the cover by the vibrating element. An object detection device characterized by having the following features.

2. In an object detection device that detects objects entering the monitoring range, A pyroelectric infrared sensor detects far-infrared radiation emitted from an object within the monitoring range at a predetermined distance from the object detection device. A capacitance measuring electrode formed of the far-infrared-transmitting material is provided on the object detection device so as to overlap with the detection area of ​​the pyroelectric infrared sensor, and the capacitance sensor detects the capacitance associated with the approach of an object within the monitoring range by a mutual capacitance measurement method or a self-capacitance measurement method. A vibrating element that vibrates the cover of the object detection device, When the capacitance sensor detects continuously for a third set time or longer while there is no output from the pyroelectric infrared sensor, the control unit controls the vibrating element to vibrate the cover and determines whether or not there is an abnormality in the device based on the state of detection by the capacitance sensor after the cover has been vibrated by the vibrating element. An object detection device characterized by having the following features.

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