JP2013247089A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of restraining wrong lighting due to vibration by reducing an influence of noises generated by vibration of the lighting device itself.SOLUTION: A threshold setting section sets a value larger than a vibrating threshold as a threshold for a mobile body when second signal strength determined at a vibration determination section is larger than the vibrating threshold. Concretely, "0 dB" that cannot be reached at any signal strength as the threshold for the mobile body under a specific frequency when the second signal strength exceeds the vibrating threshold is set as the threshold for the mobile body used for determining existence of the mobile body (human body). Then, a mobile body determination section compares a value analyzed at an FFT processing section for a mobile body with the threshold for the mobile body, and determines existence of the mobile body from comparison results. Because first signal strength detected at a frequency identical to that of the second signal strength exceeding the vibrating threshold does not exceed the threshold for the mobile body, the vibration is not determined as movement of an object.

Description

  The present invention includes a sensor that transmits a radio wave having a predetermined frequency and receives a reflected wave reflected from an object by the transmitted radio wave, and the presence of a moving body based on a frequency difference between the transmitted and received waves And an illumination device that turns on the illumination light source.

  2. Description of the Related Art Conventionally, there has been provided an illumination device that detects the presence or absence of a human body in a detection area by a sensor and turns on or off an illumination light source according to the detection result (see, for example, Patent Document 1). An active type sensor is known as such a sensor. An active sensor detects the presence or absence of a moving body in a detection area by transmitting a detection wave such as an electromagnetic wave by itself and receiving a detection wave reflected by an object.

JP 2009-129775 A

  By the way, when the illuminating device is arranged in a situation that is affected by vibration, the illumination light source may be erroneously turned on due to the influence of vibration. As a situation affected by vibration, a lighting device such as a street light or a road light in which an illumination light source is attached to the top of the pole can be considered. When a sensor is attached to these illumination devices, it is common to attach the sensor near the illumination light source at the top of the pole. However, as described above, the active sensor detects the movement of an object. For this reason, when the pole vibrates due to the influence of a vibration source such as strong winds or the passing of a vehicle, the active sensor detects the vibration as `` moving object, even though it is noise that is unrelated to the existence of the human body. ”And mistaken lighting sometimes occurred.

  The present invention has been made in order to solve the above-described problems, and its purpose is to reduce the influence of noise generated by vibration of the lighting device itself and to suppress erroneous lighting due to vibration. To provide an apparatus.

  In order to solve the above-described problems, an illumination device according to the present invention includes a moving body detection sensor that transmits a radio wave having a predetermined frequency and receives a reflected wave that is reflected by an object. In a lighting device that detects the presence of a moving body based on a difference in frequency of transmission and reception waves as a detection result by the moving body detection sensor and turns on an illumination light source, a fast Fourier transform is performed on the detection result by the moving body detection sensor. The first fast Fourier transform processing unit that processes and analyzes the intensity, the threshold setting unit that sets the threshold used to determine the presence or absence of the moving body, and the first fast Fourier transform processing unit A first determination unit that compares the first analysis value with the threshold value and determines whether the first analysis value exceeds the threshold value, thereby determining whether or not the moving object is present; and Depending on the judgment part When it is determined that the first analysis value exceeds the threshold value, a control unit that turns on the illumination light source, a vibration detection sensor that detects vibration transmitted to the illumination device, and a fast Fourier transform of the detection result by the vibration detection sensor A second fast Fourier transform processing unit that processes and analyzes the strength, and a second determination unit that determines the vibration strength from the second analysis value analyzed by the second fast Fourier transform processing unit, When the value determined by the second determination unit is larger than a predetermined value, the threshold setting unit sets a value larger than the predetermined value as the threshold value.

  The said structure WHEREIN: It is preferable that a said 1st determination part performs a comparison with a said 1st analysis value and the said threshold value for every frequency.

  ADVANTAGE OF THE INVENTION According to this invention, the influence of the noise which generate | occur | produces by the vibration of illumination device itself can be reduced, and the illumination device which can aim at suppression of the incorrect lighting by vibration can be provided.

It is a block diagram for demonstrating schematic structure of the illuminating device in embodiment. (A) is a frequency characteristic diagram for explaining the FFT processing result for a moving body and the FFT processing result for vibration when there is no vibration on the vibration sensor mounting surface, and (b) is a vibration on the vibration sensor mounting surface. FIG. 4C is a frequency characteristic diagram for explaining the FFT processing result for the moving body and the FFT processing result for the vibration in the case, FIG. 5C is the FFT processing result for the moving body when the human body moves during the vibration of the vibration sensor mounting surface; It is a frequency characteristic diagram for explaining the FFT processing result for vibration. (A) is a table for explaining the relationship between the signal intensity and the threshold value for each frequency as a result of the FFT processing for vibration in the illumination device of the above, and (b) is for the moving body in the illumination device of the above. It is a table for demonstrating the relationship between the signal strength for every frequency, and a threshold value as a result of an FFT process. FIG. 4 is a frequency characteristic diagram for explaining the transition of the signal intensity and the threshold value for each frequency in the illumination device of the above.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
The illuminating device of this embodiment is an instrument provided with an active radio wave type moving body detection sensor. As shown in FIG. 1, the illuminating device 1 of this embodiment is attached to the upper part of the pole P of height H. As shown in FIG. The illumination device 1 includes a moving body detection sensor 2 and a vibration sensor 3 that detects vibration transmitted to the illumination device 1. The illumination device 1 includes a control unit 10 mainly composed of a microcomputer, an illumination light source 4, and a light source control unit 5 that controls lighting of the illumination light source 4. Moreover, the mobile body detection sensor 2, the vibration sensor 3, the control part 10, the illumination light source 4, and the light source control part 5 are electrically connected.

First, the moving body detection sensor 2 will be described.
The moving body detection sensor 2 has an acute viewing angle toward the lower side of the pole P in the standing direction, that is, the lower side in the vertical direction. Thereby, a conical detection area having the moving body detection sensor 2 as a vertex is formed below the moving body detection sensor 2. The moving body detection sensor 2 is an active sensor that detects the presence or absence of a moving body in the detection area by transmitting a detection wave such as electromagnetic waves to the detection area and receiving the detection wave reflected by the object. is there. In addition, the moving body detection sensor 2 outputs a first detection signal indicating a difference between the frequency of the transmitted electromagnetic wave and the frequency of the electromagnetic wave reflected by the object to the control unit 10. In the present embodiment, a Doppler sensor is used as the moving body detection sensor 2. A Doppler sensor transmits electromagnetic waves (millimeter waves) toward a detection area, and when an object that reflects the electromagnetic waves is moving, the frequency of the reflected waves is shifted by the Doppler effect. It is a sensor that detects the presence or absence of a moving body from the difference in frequency. The moving body detection sensor 2 of the present embodiment uses, for example, 24 GHz electromagnetic waves.

Next, the vibration sensor 3 will be described.
The vibration sensor 3 is attached so as to be positioned in the vicinity of the moving object detection sensor 2. In the present embodiment, an acceleration sensor is used as the vibration sensor 3. In addition, since the illuminating device 1 is attached to the upper part of the pole P of height H, the vibration width to the orthogonal | vertical direction becomes the largest. Therefore, the vibration sensor 3 is a uniaxial vibration sensor that detects acceleration in the y-axis direction. Further, when the vibration sensor 3 detects vibration, the vibration sensor 3 outputs a second detection signal indicating presence of vibration to the control unit 10.

Next, the control unit 10 will be described.
As shown in FIG. 1, the control unit 10 includes a moving body fast Fourier transform processing unit 11 a, a vibration fast Fourier transform processing unit 11 b, a threshold setting unit 12, a moving body determination unit 13, and a vibration determination unit 14. And composed of The moving object fast Fourier transform processing unit 11a and the vibration fast Fourier transform processing unit 11b perform fast Fourier transform (FFT) processing. In the following description, the moving body fast Fourier transform processing unit 11a is referred to as a moving body FFT processing unit 11a. Similarly, the vibration fast Fourier transform processing unit 11b is referred to as a vibration FFT processing unit 11b. In addition, the moving body FFT processing unit 11a, the vibration FFT processing unit 11b, the threshold value setting unit 12, the moving body determination unit 13, and the vibration determination unit 14 are electrically connected.

  The moving body FFT processing unit 11a performs FFT processing on the first detection signal and analyzes the signal spectrum intensity for each frequency. The moving body FFT processing unit 11a performs FFT processing in units of time t1 (0.5 seconds in the embodiment). In the present embodiment, the moving body to be detected is a human body. Then, the FFT processing unit 11a for the moving body sets a specific frequency band of the first detection signal necessary for detecting the moving body, analyzes the signal spectrum intensity by 1 Hz in this frequency band, and converts the analysis value to the time. It outputs to the mobile body determination part 13 per t1. In this embodiment, the specific frequency band is set to 20 to 400 Hz. In the present embodiment, the signal intensity analyzed by the moving object FFT processing unit 11a corresponds to the first analysis value.

  The vibration FFT processing unit 11b performs FFT processing on the second detection signal and analyzes the signal spectrum intensity for each frequency. The vibration FFT processing unit 11b performs the FFT processing in units of time t1. In the present embodiment, the same specific frequency band (20 to 400 Hz in the present embodiment) as that of the FFT processing unit 11a for moving body is set as the frequency band of the second detection signal necessary for detecting vibration. Yes. Then, the vibration FFT processing unit 11b analyzes the signal spectrum intensity in units of 1 Hz in this frequency band, and outputs the analysis value to the vibration determination unit 14 in units of time t1, like the moving body FFT processing unit 11a. . In the present embodiment, the signal intensity analyzed by the vibration FFT processing unit 11b corresponds to the second analysis value. In the following description, the signal spectrum intensities of the first detection signal and the second detection signal may be simply indicated as “signal intensity”.

  The threshold value setting unit 12 sets a moving object threshold value to be compared with the analysis value analyzed by the moving object FFT processing unit 11a in order to determine whether or not the moving object exists in the detection area. .

  A memory 13 a that can write and read necessary data is connected to the mobile body determination unit 13. Moreover, the mobile body determination part 13 A / D-converts the value output from the FFT processing part 11a for mobile bodies into a digital value. Then, the mobile body determination unit 13 compares the mobile body threshold set by the threshold setting unit 12 with the signal intensity analyzed by the mobile body FFT processing unit 11a for each 1 Hz in the specific frequency band, and the comparison The presence or absence of the moving object is determined from the result.

  The vibration determination unit 14 is connected to a memory 14a that can write and read necessary data. Further, the vibration determination unit 14 A / D converts the value output from the vibration FFT processing unit 11b into a digital value. Then, the vibration determination unit 14 compares the predetermined vibration threshold value with the signal intensity analyzed by the vibration FFT processing unit 11b every 1 Hz in the specific frequency band, and based on the comparison result, the vibration FFT processing is performed. The magnitude of the vibration intensity is determined by determining the magnitude of the signal intensity analyzed by the unit 11b.

The light source control unit 5 turns on the illumination light source 4 when the moving body determination unit 13 determines that there is a moving body in the detection area. In addition, the illumination light source 4 in this embodiment is a discharge lamp.
Hereinafter, the processing results of the FFT processing unit 11a for moving body and the FFT processing unit 11b for vibration will be described with reference to FIGS. In FIG. 2, the horizontal axis is frequency (Hz), and the vertical axis is signal intensity (dB). In the present embodiment, the moving object threshold is set to a predetermined value (in this example, “−50 dB”). Further, the vibration threshold is set to a value approximated to the moving object threshold (in this example, “−50 dB”).

  The value set as the moving body threshold is a value smaller than the signal intensity detected when the presence of a human body is detected in the detection area. On the other hand, the value set as the vibration threshold is a value for preventing a human body from being determined to be present when the threshold is exceeded despite the signal intensity based on vibration. Therefore, when a signal intensity smaller than the vibration threshold is detected, vibration is occurring, but human body detection is not affected.

  As shown in FIG. 2A, when the second detection signal is not output from the vibration sensor 3, the signal intensity as the frequency component is not detected at any frequency as the analysis result of the vibration FFT processing unit 11b. In addition, since the first detection signal is not output from the moving body detection sensor 2, the signal intensity as the frequency component is not detected at any frequency as the analysis result of the FFT processing unit 11a for the moving body.

  Further, as shown in FIG. 2B, when the second detection signal is output from the vibration sensor 3, the frequency components P1 and P2 are respectively obtained at the frequencies f1 and f2 as the analysis result of the vibration FFT processing unit 11b. Detected. Specifically, the frequency component P1 exceeds the vibration threshold value, while the frequency component P2 does not exceed the vibration threshold value.

  Further, as shown in FIG. 2B, the moving body detection sensor 2 detects the vibration that has occurred on the mounting surface of the vibration sensor 3 as a relative “movement of the object”, and outputs a first detection signal. As a result, the frequency components P1 and P2 are detected at the frequencies f1 and f2, respectively, as the analysis result of the FFT processing unit 11a for the moving body, similarly to the analysis result of the FFT processing unit 11b for vibration.

  Thus, when a vibration occurs in the vicinity of the moving body detection sensor 2, the moving body detection sensor 2 and the vibration sensor 3 respectively detect the vibration. Then, by detecting the same vibration, the frequency component is detected at the same frequency as the analysis result of the FFT processing unit 11a for moving body and the FFT processing unit 11b for vibration linked to the vibration component.

  Further, as shown in FIG. 2C, when the second detection signal is output from the vibration sensor 3, the frequency components P1 and P2 are respectively obtained at the frequencies f1 and f2 as the analysis result of the vibration FFT processing unit 11b. Detected. On the other hand, since the vibration sensor 3 cannot detect the presence of a moving body in the detection area, a frequency component indicating that a human body exists in the detection area is not detected as an analysis result of the vibration FFT processing unit 11b.

  On the other hand, as described above, since the moving body detection sensor 2 detects the vibration as “movement of the object”, the frequency components P1 and P2 are obtained at the frequencies f1 and f2 as the analysis result of the moving body FFT processing unit 11a. Each is detected. Furthermore, since the moving body detection sensor 2 can detect that a moving body exists in the detection area, it outputs a first detection signal. For this reason, frequency components P3, P4, and P5 are detected at frequencies f3, f4, and f5, respectively, as an analysis result of the moving body FFT processing unit 11a.

  Thus, when the human body moves within the detection area during vibration of the mounting surface of the vibration sensor 3, the vibration sensor 3 detects only vibration. On the other hand, the moving body detection sensor 2 detects both vibration and the presence of the moving body. Therefore, the analysis result of the moving object FFT processing unit 11a includes a mixture of a frequency component indicating the presence of the moving object and a frequency component indicating the vibration.

Hereinafter, the details of control for distinguishing and determining the presence / absence of the moving body and the vibration of the mounting surface of the vibration sensor 3 will be described in detail.
The vibration determination unit 14 compares the vibration threshold with the signal intensity analyzed by the vibration FFT processing unit 11b every 1 Hz. When there is a signal intensity that exceeds the vibration threshold, a specific signal that specifies the corresponding frequency is output to the threshold setting unit 12. As a result, the threshold setting unit 12 recognizes a frequency exceeding the vibration threshold.

  Further, when the signal intensity exceeds the vibration threshold, the vibration determination unit 14 sets a value “1” indicating that the signal intensity exceeds the vibration threshold to the determination flag set for each frequency in the memory 14a. . On the other hand, when the signal intensity does not exceed the vibration threshold, the vibration determination unit 14 sets a value “0” indicating that the signal intensity does not exceed the vibration threshold to the determination flag set for each frequency.

  Next, the threshold value setting unit 12 sets the moving object threshold value by 1 Hz in the specific frequency band. At this time, the threshold setting unit 12 sets different threshold values for the moving body for each frequency depending on whether or not a specific signal is input. Specifically, when a specific signal is not input, the threshold setting unit 12 sets a predetermined value (−50 dB in the embodiment). On the other hand, when the specific signal is input, the threshold setting unit 12 sets a value larger than the vibration threshold as the moving object threshold at the frequency specified by the specific signal. Specifically, the threshold value setting unit 12 sets the maximum value (in this example, “0 dB”) of the signal strengths that can be set as the moving object threshold value.

  As described above, when the moving body detection sensor 2 detects vibration as “movement of an object”, it is linked to the vibration component, and at the same frequency as the frequency when the signal intensity based on vibration is detected. A frequency component is detected. Therefore, as an analysis result of the moving object FFT processing unit 11a, the signal intensity that indicates the presence of the moving object at the same frequency as the frequency at which the signal intensity exceeding the vibration threshold is detected. Will be detected. However, this value of “0 dB” is a value that cannot reach any signal strength. Therefore, the signal intensity detected at the same frequency as the frequency at which the signal intensity exceeding the vibration threshold is detected does not exceed the moving object threshold. That is, the signal intensity detected when the moving body detection sensor 2 detects vibration is not used as a determination material for determining the presence or absence of the moving body.

  Moreover, the mobile body determination part 13 reads the analysis value of the signal strength analyzed by the FFT processing part 11a for mobile bodies for every frequency. Next, the mobile body determination unit 13 compares the read signal strength with the mobile body threshold value at the frequency when the signal strength is detected, and determines whether the signal strength exceeds the mobile body threshold value. judge.

  When the signal intensity does not exceed the moving object threshold, the moving object determination unit 13 determines that the value “0” indicating that the signal intensity does not exceed the moving object threshold is set for each frequency in the memory 13a. Set to flag.

  As described above, a value (0 dB) larger than the vibration threshold is set as the moving object threshold at the same frequency as the frequency at which the signal intensity exceeding the vibration threshold is detected. As a result, the signal strength detected at that frequency does not exceed the moving object threshold. Therefore, “0” is set in the determination flag associated with the same frequency as the frequency at which the signal intensity exceeding the vibration threshold is detected. That is, since the vibration of the mounting surface of the vibration sensor 3 is not determined as the presence of the moving body, the illumination light source 4 is erroneously turned on due to the vibration interference even when the moving body does not exist in the detection area. There is nothing.

  On the other hand, when the signal strength exceeds the moving object threshold, the moving body determination unit 13 sets a value “1” indicating that the signal intensity exceeds the threshold to the determination flag set for each frequency. . After setting “1” or “0” in the determination flag, the mobile body determination unit 13 determines whether or not the comparison determination between the signal intensity for each frequency in the specific frequency band and the threshold value for the mobile body is completed. If the comparison determination has not ended, the moving body determination unit 13 performs a comparison determination between the signal intensity at the next frequency and the moving body threshold.

  On the other hand, when the comparison determination is completed, the moving body determination unit 13 determines whether or not the number of times the signal intensity exceeds the moving body threshold is “5 times” or more. The moving body determination unit 13 determines whether or not the number of determination flags in which a value “1” indicating that the signal intensity exceeds the moving body threshold is set in the specific frequency band is 5 or more. .

  When the number of times the signal intensity exceeds the moving object threshold is “5 times” or more, the moving object determination unit 13 determines that the moving object exists in the detection area. Then, the moving body determination unit 13 outputs an instruction signal instructing that a moving body exists to the light source control unit 5. On the other hand, when the number of times the signal intensity exceeds the moving object threshold is less than “5”, the moving object determination unit 13 does not output the instruction signal. Then, when the time t1 elapses, the moving body determination unit 13 again performs the comparison determination between the signal intensity for each frequency and the moving body threshold value during the time t1.

  When the instruction signal is input from the moving body determination unit 13, the light source control unit 5 transmits a control signal for turning on the illumination light source 4 to the illumination light source 4 to turn on the illumination light source 4. The light source controller 5 starts counting a predetermined lighting holding time (for example, 10 seconds) every time a control signal is output. When the lighting holding time is counted, the light source control unit 5 transmits a control signal for turning off the illumination light source 4 to the illumination light source 4 and turns off the illumination light source 4.

  Hereinafter, an operation example (action) until the illumination light source 4 is turned on will be described. In the following description, the signal strength analyzed by the moving body FFT processing unit 11a is referred to as “first signal strength”, while the signal strength analyzed by the vibration FFT processing unit 11b is expressed as “second signal strength”. ".

Assume that a result as shown in FIG. 3A is obtained as an analysis result in the vibration FFT processing unit 11b.
For example, the second signal strength at 20 Hz is “−80 dB”. Since “−80 dB” does not exceed the vibration threshold “−50 dB”, the determination flag is set to “0”. On the other hand, the second signal strength at 22 Hz is “−35 dB”. Since “−35 dB” exceeds the vibration threshold “−50 dB”, the determination flag is set to “1”. Therefore, the vibration determination unit 14 outputs a specific signal specifying the frequency “22 Hz” at which the second signal intensity exceeding the vibration threshold is detected to the threshold setting unit 12.

  Then, the threshold setting unit 12 that has input the specific signal sets “0 dB” as the moving object threshold at 22 Hz. Incidentally, since the threshold setting unit 12 does not input a specific signal other than 22 Hz in the specific frequency band, the threshold value setting unit 12 is set to a predetermined value (in the embodiment, 20 Hz, 21 Hz, 23 to 400 Hz). -50Hz).

  Assuming that a result as shown in FIG. 3B is obtained as an analysis result in the FFT processing unit 11a for the moving body, a frequency characteristic as shown in FIG. 4 is obtained accordingly. In FIG. 4, the horizontal axis is frequency (Hz), and the vertical axis is signal intensity (dB).

  As shown in FIGS. 3B and 4, “−70 dB” is detected as the first signal intensity at 20 Hz. As described above, since the second signal intensity (−80 dB) does not exceed the vibration threshold (−50 dB) at 20 Hz, “−50 dB” is set as the moving object threshold. Since the first signal strength “−70 dB” does not exceed the moving object threshold value “−50 dB”, the determination flag is set to “0”.

  On the other hand, the first signal intensity P10 at 22 Hz is “−40 dB”. Since the second signal intensity (−35 dB) exceeding the vibration threshold is detected at 22 Hz, “0 dB” is set as the moving object threshold at 22 Hz. Since the first signal strength P10 (−40 dB) does not exceed the moving object threshold “0 dB”, the determination flag is set to “0”.

  On the other hand, the first signal strength P11 at 80 Hz is “−35 dB”. Since the first signal strength P11 exceeds the moving object threshold “−50 dB”, “1” is set in the determination flag. Similarly, the first signal strength P12 that is “−30 dB” is detected at 81 Hz, and the first signal strength P13 that is “−25 dB” is detected at 82 Hz. Similarly, the first signal strength P14 that is “−35 dB” is detected at 83 Hz, and the first signal strength P15 that is “−30 dB” is detected at 398 Hz.

  In this case, the first signal intensities P11 to P15 at 80 Hz, 81 Hz, 82 Hz, 83 Hz, and 398 Hz respectively exceed the moving object threshold “−50 dB”. Therefore, the mobile body determination unit 13 sets “1” in the determination flag corresponding to each frequency.

  Then, when the number of determination flags set to “1” is 5 in the specific frequency band, the mobile body determination unit 13 determines that there is a mobile body in the detection area. Then, the moving body determination unit 13 outputs an instruction signal to the light source control unit 5. Thereafter, the light source control unit 5 performs control so that the illumination light source 4 is turned on.

Next, characteristic effects of the present embodiment will be described.
(1) When the signal intensity determined by the vibration determination unit 14 is larger than a predetermined value (in this example, a vibration threshold), the threshold setting unit 12 sets a value larger than the predetermined value as the moving object threshold. Set. Then, the mobile body determination unit 13 compares the analysis value analyzed by the mobile body FFT processing unit 11a with the mobile body threshold value, and determines the presence or absence of the mobile body from the comparison result. According to this, the signal intensity detected at the same frequency as the frequency at which the signal intensity exceeding the vibration threshold is detected does not exceed the moving object threshold. That is, the signal intensity detected when the moving body detection sensor 2 detects vibration is not used as a determination material for determining the presence or absence of the moving body. On the other hand, the analysis value obtained by analyzing the first detection signal reflected from the moving body exceeds the moving body threshold. Therefore, the vibration and the moving body can be easily distinguished depending on whether or not the moving body threshold is exceeded, and the presence or absence of the moving body can be easily determined. Therefore, it is possible to reduce the influence of noise generated by the vibration of the lighting device 1 itself and improve detection sensitivity.

  (2) The threshold value setting unit 12 sets the maximum value (0 dB in the embodiment) among the signal strengths that can be set as the moving body threshold value at the frequency when the second signal strength exceeds the vibration threshold value. Since “0 dB” is a value that the detected signal intensity cannot reach, the first signal intensity detected when the moving body detection sensor 2 detects vibration determines whether or not the moving body exists. It is not used as a judgment material for Therefore, the vibration and the moving body can be easily distinguished depending on whether or not the moving body threshold is exceeded, and the presence or absence of the moving body can be easily determined. Therefore, it is possible to reduce the influence of noise generated by the vibration of the lighting device 1 itself and improve detection sensitivity.

  (3) The moving body determination unit 13 compares the first signal intensity for each frequency analyzed by the moving body FFT processing unit 11a with the moving body threshold value for each frequency. According to this, the frequency band (for example, 20-30Hz) including the specific frequency exceeding the threshold value for moving objects is not set as the determination target, so that the moving object to be detected is distinguished from the vibration on the mounting surface of the vibration sensor 3. Compared with the technique to do, the presence or absence of a moving body can be determined more correctly. For example, even if the signal intensity is detected at 25 Hz due to the presence of the moving object, “25 Hz” is included in the frequency band, so that it is determined that the moving object does not exist, and the detection sensitivity decreases. . On the other hand, according to the method of comparing the analysis value for each frequency and the threshold value for the moving object, the presence or absence of the moving object can be determined more accurately.

  (4) The vibration of the mounting surface of the vibration sensor 3 is abruptly generated when the pole P is beaten by a strong wind or the passing of a vehicle. However, since the threshold setting unit 12 newly sets the moving object threshold value for each frequency at each time t1, if the newly set moving object threshold value is compared with the signal intensity, sudden vibrations are generated. , It is not mistakenly recognized as the presence of a moving object. Therefore, even if a sudden vibration occurs, it is possible to appropriately set a threshold value so that the vibration is not erroneously recognized as the presence of the moving body.

  (5) By using a Doppler sensor as a moving body detection sensor, it is possible to detect the presence or absence of a moving body that moves within the detection area, and an object that is stationary at a fixed position may be excluded from the detection target. it can.

  (6) The mobile body determination unit 13 determines that there is a mobile body when the number of times that the first signal intensity has exceeded the threshold for mobile body has reached a specified number of times of 2 or more. Thereby, lighting control of the illumination light source 4 can be performed more accurately.

  (7) When the moving body threshold is set uniformly, the first signal intensity is set when the moving body threshold is set for each frequency even if the first signal intensity does not exceed the moving body threshold. May exceed the threshold for moving objects. Therefore, the detection sensitivity can be further improved.

In addition, you may change the said embodiment of this invention as follows.
In the above embodiment, the values set as the vibration threshold and the moving body threshold are not limited to −50 dB. For example, a different threshold may be set for each frequency. However, values that cannot reach any signal strength such as “0 dB” or values that can reach any signal strength such as “−100 dB” are excluded. Further, the vibration threshold value and the moving object threshold value may be different values.

  In the above-described embodiment, the vibration sensor 3 may be a uniaxial vibration sensor that detects vibration in the x-axis or z-axis direction, or may vibrate in any two directions of the x-axis, y-axis, and z-axis. It is good also as a biaxial vibration sensor to detect. Alternatively, a three-axis vibration sensor that detects vibrations in three directions of the x-axis, the y-axis, and the z-axis may be used. What is necessary is just to use these sensors properly according to the installation condition of the illuminating device 1. FIG. For example, when the lighting device 1 is attached to an upper part of an elastic member such as a spring that can be displaced in a plurality of directions, it is preferable to use a triaxial vibration sensor.

  -In the said embodiment, if the relationship of the attachment position of the vibration sensor 3 and the mobile body detection sensor 2 is the range in which the mobile body determination part 13 can detect the vibration in the attachment surface of the vibration sensor 3 as a movement of an object. , It can be installed anywhere.

  In the above embodiment, regarding the first signal intensity detected at the same frequency as the frequency exceeding the vibration threshold, it is not necessary to make a determination for determining the presence or absence of the moving object using the first signal intensity. good. According to this, the vibration is not erroneously recognized as the movement of the object.

  In the above embodiment, the light source control unit 5 may be provided on the power supply line to the illumination light source 4. In this case, the power supply to the illumination light source 4 is turned on / off instead of outputting the control signal. Thus, the illumination light source 4 can be turned on / off.

  -In above-mentioned embodiment, the mobile body detection sensor 2 should just be an active type mobile body detection sensor 2, and is not restricted to the millimeter wave sensor using a millimeter wave. For example, a microwave sensor using a microwave or a distance measuring sensor that detects a distance to an object in a detection area using an ultrasonic wave as a detection wave may be used.

  In each of the above embodiments, when the signal intensity exceeding the moving object threshold is 1 to 4, or 6 or more, it may be determined that the moving object exists in the detection area. However, in consideration of the accuracy of detection sensitivity, it is preferable to determine that there is a moving body in the detection area when there are a plurality of signal intensities exceeding the threshold for the moving body.

  -In the said embodiment, the frequency band of the 1st detection signal required in order to detect a moving body does not need to be a frequency band of 20-400 Hz. That is, based on the moving speed of the moving body, the frequency of the radio wave transmitted by the moving body detection sensor 2, the speed of light, and the angle formed by the moving direction of the moving body with respect to the straight line connecting the upper end of the object and the sensor, You may change suitably.

  In the above embodiment, the moving object threshold value may be set according to the presence or absence of vibration at a specific frequency. That is, when a second signal intensity having a size (for example, 2 dB) that does not affect the detection of the human body in the detection area is detected, the vibration threshold value is determined to be “no vibration”. May be set. Further, when a value larger than “0 dB” is detected as an analysis result in the vibration FFT processing unit 11b, it may be determined that “vibration is present”.

-In the above-mentioned embodiment, although a human body was shown as an example of a moving body, it is good also as moving bodies, such as vehicles other than a human body.
Next, a technical idea that can be grasped from the above embodiment and another example will be added below.

(A) The illumination device according to claim 1 or 2, wherein the specified value is a value approximate to a first analysis value indicating that the moving body is present.
(B) In the illumination device according to claim 1 or 2, the first fast Fourier transform processing unit and the second fast Fourier transform processing unit are detected by the moving body detection sensor and the vibration detection sensor. The intensity for each frequency of the result is detected, and the first determination unit is specified when the value determined by the second determination unit is determined to be greater than a predetermined value. In the frequency, the lighting device is characterized in that the same value as the maximum signal intensity in the detectable range is set as a threshold value.

  (C) The illumination device according to claim 1 or 2, wherein the first fast Fourier transform processing unit and the second fast Fourier transform processing unit are detected by the moving body detection sensor and the vibration detection sensor. The intensity for each frequency of the result is detected, and the first determination unit is specified when the value determined by the second determination unit is determined to be greater than a predetermined value. The lighting device is characterized in that the presence or absence of the moving object is not determined in terms of frequency.

  (D) In the illumination device according to any one of claims 1 and 2, and the technical ideas (a) to (c), the threshold setting unit sets the threshold for each frequency. A lighting device characterized by that.

  (E) In the lighting device according to any one of claims 1, 2, and the technical ideas (a) to (d), the number of times that the first analysis value exceeds the threshold value is counted. And the first determining unit determines the presence of the moving body when the number of times counted by the counting unit has reached a specified number of times of 2 or more. Lighting device.

  DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 2 ... Moving body detection sensor (moving body detection sensor), 3 ... Vibration sensor (vibration detection sensor), 4 ... Illumination light source, 5 ... Light source control part (control part), 11a ... Fast Fourier transform for moving bodies Conversion processing unit (first fast Fourier transform processing unit), 11b ... Fast Fourier transform processing unit for vibration (second fast Fourier transform processing unit), 12 ... Threshold setting unit, 13 ... Moving object determination unit (first Determination unit), 14... Vibration determination unit (second determination unit).

Claims (2)

A mobile body detection sensor that transmits radio waves having a predetermined frequency and receives a reflected wave reflected by an object is transmitted, and the frequency of the transmission and reception as a detection result by the mobile body detection sensor In the lighting device that detects the presence of the moving body based on the difference between the two and turns on the illumination light source,
A first fast Fourier transform processing unit that performs a fast Fourier transform process on the detection result of the moving body detection sensor and analyzes the intensity;
A threshold value setting unit for setting a threshold value used for determining the presence or absence of the moving object;
By comparing the first analysis value analyzed by the first fast Fourier transform processing unit with the threshold value and determining whether or not the first analysis value exceeds the threshold value, the presence or absence of the moving object is determined. A first determination unit for determining;
A control unit that turns on the illumination light source when the first determination unit determines that the first analysis value exceeds the threshold;
A vibration detection sensor for detecting vibration transmitted to the lighting device;
A second fast Fourier transform processing unit for performing a fast Fourier transform process on the detection result of the vibration detection sensor and analyzing the strength;
A second determination unit that determines vibration intensity from the second analysis value analyzed by the second fast Fourier transform processing unit,
The threshold value setting unit, when the value determined by the second determination unit is larger than a predetermined value, sets a value larger than the specified value as the threshold value. The lighting device according to claim 1.
The lighting device according to claim 1, wherein the first determination unit compares the first analysis value with the threshold value for each frequency.