Detection sensor

Abstract

To provide a detection sensor capable of detecting an object to be detected with high accuracy while suppressing an increase in the number of components.SOLUTION: A detection sensor includes a first radio wave radar, a first reflecting member, and a temperature sensor. The first radio wave radar detects an object to be detected by transmitting radio waves and receiving reflected radio waves. The first reflecting member limits a transmission range of radio waves from the first radio radar to a first detection range. The temperature sensor detects a temperature distribution in a predetermined space including at least a part of the first detection range. The temperature sensor is disposed at a position where a detection range of the temperature sensor is not limited by the first reflecting member.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a detection sensor. [Background technology]

[0002] International Publication WO 2020 / 049648 (Patent Document 1) discloses a sensing device that performs sensing using an infrared sensor and sensing using a radar sensor (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 049648 Summary of the Invention [Problem to be solved by the invention]

[0004] When detecting a detection target using a radio wave radar such as the radar sensor disclosed in the above-mentioned Patent Document 1, erroneous detection, such as detecting something other than the detection target, may occur.

[0005] The present invention has been made to solve such problems, and its object is to provide a detection sensor that can detect an object to be detected with higher accuracy while suppressing an increase in the number of parts. [Means for solving the problem]

[0006] A detection sensor according to the present invention includes a first radio wave radar, a first reflecting member, and a temperature sensor. The first radio wave radar detects a detection target by transmitting radio waves and receiving reflected radio waves. The first reflecting member limits the transmission range of the radio waves by the first radio wave radar to a first detection range. The temperature sensor detects a temperature distribution in a predetermined space including at least a part of the first detection range. The temperature sensor is disposed in a position where the detection range of the temperature sensor is not limited by the first reflecting member.

[0007] The inventor(s) discovered that when a radio wave radar is used to detect a detection target (e.g., a person), if a circulator or the like is present within the detection range, the circulator or the like other than the detection target may be erroneously detected as the detection target. In this detection sensor, a temperature sensor is provided in addition to the radio wave radar to suppress erroneous detection, and the temperature sensor is disposed in a position where the detection range of the temperature sensor is not limited by the first reflecting member. Therefore, with this detection sensor, there is no need to provide a temperature sensor in each of the multiple regions sandwiching the first reflecting member, and therefore the detection target can be detected with higher accuracy while suppressing an increase in the number of parts.

[0008] The detection sensor may further include a second radio wave radar that detects the detection target by transmitting radio waves and receiving reflected radio waves, and a second reflecting member that limits the transmission range of the radio waves by the second radio wave radar to a second detection range, the specified space may further include at least a portion of the second detection range, the temperature sensor may be positioned at a position where the detection range of the temperature sensor is not limited by the second reflecting member, and in a planar view, the first reflecting member may be located between the temperature sensor and the first radio wave radar, and the second reflecting member may be located between the temperature sensor and the second radio wave radar.

[0009] In this detection sensor, the temperature sensor is disposed at a position where the detection range of the temperature sensor is not limited by either the first reflecting member or the second reflecting member. Therefore, with this detection sensor, it is not necessary to provide a temperature sensor in each of the multiple regions sandwiching the first reflecting member and each of the multiple regions sandwiching the second reflecting member, so that it is possible to detect the detection target with higher accuracy while suppressing an increase in the number of parts.

[0010] The detection sensor may further include a receiving unit that receives settings related to the operation of the detection sensor, and a light-emitting element that emits light of a first light color and a second light color, and there may be a first mode and a second mode as modes for setting, and the content of the operation set in the first mode and the content of the operation set in the second mode may be different from each other, and when the detection sensor is set to the first mode, the light-emitting element may emit light of the first light color, while when the detection sensor is set to the second mode, the light-emitting element may emit light of the second light color.

[0011] In this detection sensor, when the detection sensor is set to the first mode, the light-emitting element emits light of a first emission color, whereas when the detection sensor is set to the second mode, the light-emitting element emits light of a second emission color, so that the user can visually recognize the current mode of the detection sensor.

[0012] The detection sensor may be installed so that a portion of it is embedded in the ceiling, and in a state in which the detection sensor is installed, at least a portion of the first radio wave radar may be located below the ceiling.

[0013] In this detection sensor, when the detection sensor is installed, at least a portion of the first radio wave radar is located below the ceiling. Therefore, with this detection sensor, even if the ceiling is made of a material with low radio wave transmittance, the influence of the ceiling on the radio waves emitted by the first radio wave radar is limited, so that the detection target can be detected with high accuracy by using the first radio wave radar.

[0014] In the above detection sensor, the first radio wave radar may be mounted on a first radar board, the first reflective member may be formed by bending a single plate, the first radar board and the first reflective member may overlap in a planar view, and a cutout portion may be formed on each of the two sides of the first reflective member facing the first radar board to avoid the first radar board.

[0015] In this detection sensor, the first radar board and the first reflecting member overlap in a plan view, and a notch portion is formed on each of two sides of the first reflecting member facing the first radar board to avoid the first radar board. Therefore, according to this detection sensor, the first reflecting member and the first radar board are arranged more compactly by forming the notch portion in the first reflecting member, and therefore it is possible to prevent the detection sensor from becoming large. Effect of the Invention

[0016] According to the present invention, it is possible to provide a detection sensor capable of detecting an object to be detected with high accuracy while suppressing an increase in the number of parts. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a diagram illustrating a schematic of a lighting system. [Diagram 2] FIG. 2 is a diagram illustrating an electrical configuration of a detection sensor. [Diagram 3] FIG. 2 is a diagram illustrating a schematic electrical configuration of a first radio wave radar. [Figure 4] FIG. 2 is a perspective view illustrating an external appearance of the detection sensor. [Diagram 5] FIG. 4 is a diagram illustrating a detection sensor main body as viewed from below. [Figure 6] FIG. 4 is a schematic diagram showing the cover from diagonally above. [Figure 7] FIG. 4 is a schematic side view of each member fixed to the control board. [Figure 8] 1 is a schematic side view showing a cross section of a detection sensor installed on a ceiling. FIG. [Figure 9] 5 is a diagram showing an example of a transition of an output value of a first radio wave radar. FIG. [Figure 10] 4 is a diagram for explaining the timing at which the outputs of the radio wave radars and the temperature sensors are used. FIG. [Figure 11] 10 is a diagram for explaining an example of a location where a temperature sensor is arranged, which makes it difficult to detect a wide range in a room. FIG. [Figure 12] 10 is a diagram for explaining the effect of being able to set the gain of the transmitting antenna in each radio radar individually. FIG. [Figure 13] 13A and 13B are diagrams for explaining other means for adjusting the width of each detection range. [Figure 14] 6 is a flowchart showing the operation at the time of setting each radio radar. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment according to one aspect of the present invention (hereinafter also referred to as "the present embodiment") will be described in detail with reference to the drawings. Note that the same or corresponding parts in the drawings are given the same reference numerals and their description will not be repeated. Also, each drawing is drawn in a schematic manner with objects appropriately omitted or exaggerated for ease of understanding.

[0019] [1. Configuration] <1-1. Overall configuration of lighting system> Fig. 1 is a diagram showing a schematic diagram of a lighting system 10 according to the present embodiment. In Fig. 1, a room 15 is shown from above with the ceiling transparent. In other words, Fig. 1 shows the room 15 from the side of a detection sensor 100 attached to the ceiling.

[0020] 1, the lighting system 10 includes a detection sensor 100 and a plurality of lighting devices 200. The detection sensor 100 includes a first radio wave radar 110, a second radio wave radar 120, a third radio wave radar 130, a fourth radio wave radar 140, and a temperature sensor 145, and is configured to detect the presence or absence of a detection target (e.g., a person) in a room 15, which is an example of a predetermined space. Note that the predetermined space may not only be a room, but also the outdoors or near an entrance or exit of a building.

[0021] Each of the first radio wave radar 110, the second radio wave radar 120, the third radio wave radar 130, and the fourth radio wave radar 140 is, for example, an FMCW (Frequency Modulated Continuous Wave) type radio wave radar or a Doppler type radio wave radar. The temperature sensor 145 is, for example, a thermopile. Although details will be described later, the detection sensor 100 detects the presence or absence of a person in the room 15 by appropriately using the detection results of the radio wave radars and the detection result of the temperature sensor 145.

[0022] The indoor space 15 includes detection ranges A1, A2, A3, and A4. The first radio wave radar 110 is used to detect the presence or absence of a person in the detection range A1, and the second radio wave radar 120 is used to detect the presence or absence of a person in the detection range A2. The third radio wave radar 130 is used to detect the presence or absence of a person in the detection range A3, and the fourth radio wave radar 140 is used to detect the presence or absence of a person in the detection range A4. The temperature sensor 145 detects the temperature distribution in each of the detection ranges A1, A2, A3, and A4 individually. The temperature sensor 145 outputs, for example, image data indicating the temperature distribution in each of the detection ranges A1, A2, A3, and A4. The image data output by the temperature sensor 145 is used to detect the presence or absence of a person in each of the detection ranges A1, A2, A3, and A4.

[0023] In the detection sensor 100, detection result data is generated based on the detection results by each radio wave radar or temperature sensor 145. The detection result data indicates, for example, whether or not a person is present in each detection range. In the detection sensor 100, a control signal is generated in accordance with the detection result data. The control signal is a signal for controlling each of the multiple lighting devices 200.

[0024] For example, when a person is detected in the detection range A1 and no person is detected in the detection ranges A2, A3, and A4, the detection sensor 100 generates a control signal to turn on each of the lighting devices 200 that illuminate the detection range A1 and turn off each of the lighting devices 200 that illuminate the detection ranges A2, A3, and A4. The control signal generated in the detection sensor 100 is transmitted from the detection sensor 100 to each of the lighting devices 200. Each lighting device 200 operates according to the received control signal. As a result, each lighting device 200 is appropriately controlled depending on whether or not a person is present in each detection range.

[0025] <1-2. Configuration of the detection sensor> (1-2-1. Electrical configuration of the detection sensor) Fig. 2 is a diagram showing a schematic diagram of an electrical configuration of the detection sensor 100. As shown in Fig. 2, the detection sensor 100 includes a first radio wave radar 110, a second radio wave radar 120, a third radio wave radar 130, a fourth radio wave radar 140, a temperature sensor 145, an infrared receiving unit 146, an illuminance sensor 147, indicators 148 and 149, a control unit 160, a communication unit 135, and a power supply unit 150.

[0026] As described above, in the detection sensor 100, the first radio wave radar 110 is used to detect the presence or absence of a person in the detection range A1 (FIG. 1), and the second radio wave radar 120 is used to detect the presence or absence of a person in the detection range A2. The third radio wave radar 130 is used to detect the presence or absence of a person in the detection range A3, and the fourth radio wave radar 140 is used to detect the presence or absence of a person in the detection range A4. Each of the first radio wave radar 110, the second radio wave radar 120, the third radio wave radar 130, and the fourth radio wave radar 140 is, for example, configured by an FMCW type radar or a Doppler type radar. The first radio wave radar 110, the second radio wave radar 120, the third radio wave radar 130, and the fourth radio wave radar 140 have, for example, the same configuration as each other. The first radio wave radar 110 will be described below as a representative example.

[0027] FIG. 3 is a diagram showing a schematic electrical configuration of the first radio wave radar 110. In this example, the first radio wave radar 110 is configured by a radio wave radar of the FMCW system. As shown in FIG. 3, the first radio wave radar 110 includes a transmitting antenna 113, a receiving antenna 114, a communication unit 116, and a control circuit 118. The transmitting antenna 113 is configured to transmit a transmitting wave whose frequency (transmitting frequency) changes over time. That is, the transmitting antenna 113 is configured to transmit a transmitting wave according to the FMCW system. The receiving antenna 114 is configured to receive a receiving wave whose frequency (receiving frequency) changes over time. That is, the receiving antenna 114 is configured to receive, for example, a receiving wave according to the FMCW system.

[0028] When the first radio wave radar 110 is configured by a Doppler radar, the transmitting antenna 113 may be configured to transmit a transmission wave of a predetermined frequency. Also, the receiving antenna 114 may be configured to receive a reflected wave. In this case, for example, when the transmission wave is reflected by a person present within the detection range, the frequency of the reflected wave changes. Then, the presence or absence of a person is detected based on the difference between the frequency of the transmission wave and the frequency of the reflected wave.

[0029] The control circuit 118 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory). The control circuit 118 is configured to control each component in the first radio wave radar 110 in accordance with information processing. The control circuit 118, for example, compares a transmission frequency with a reception frequency, and outputs a comparison result (for example, a difference). Note that the function realized by the control circuit 118 may be realized by one circuit, or may be realized by multiple circuits.

[0030] The communication unit 116 is configured to communicate with the control unit 160 (FIG. 2). The communication unit 116 transmits, for example, a signal indicating the output by the first radio wave radar 110 (for example, a signal indicating the difference between the transmission frequency and the reception frequency) to the control unit 160. Note that the communication between the communication unit 116 and the control unit 160 may be wired communication or wireless communication.

[0031] 2 again, the temperature sensor 145 is configured, for example, by a thermopile as described above. The temperature sensor 145 is configured, for example, by one thermopile. The temperature sensor 145 outputs image data indicating the temperature distribution in each of the detection ranges A1, A2, A3, and A4. The reason for providing the temperature sensor 145 will be explained in detail later.

[0032] The infrared receiving unit 146 is configured to receive signals instructing various settings related to the detection sensor 100 from an external remote control (not shown) of the detection sensor 100. The infrared receiving unit 146 functions as a reception unit that receives settings related to the operation of the detection sensor 100. The illuminance sensor 147 is configured to measure the illuminance of the surroundings.

[0033] The control unit 160 includes, for example, a CPU, a RAM, and a ROM. The control unit 160 is configured to control each component in the detection sensor 100 in accordance with information processing. The control unit 160 generates detection result data based on a signal indicating the output of the first radio wave radar 110, a signal indicating the output of the second radio wave radar 120, a signal indicating the output of the third radio wave radar 130, a signal indicating the output of the fourth radio wave radar 140, and image data output by the temperature sensor 145. Furthermore, the control unit 160 generates a control signal for each lighting device 200 based on the detection result data.

[0034] The communication unit 135 is configured to communicate directly or indirectly with each of the plurality of lighting devices 200, for example. The communication unit 135 transmits, for example, detection result data directly or indirectly to each of the plurality of lighting devices 200. The communication unit 135 is capable of, for example, wired communication or wireless communication. Examples of wireless communication include communication using the 920 MHz band, the 2.4 GHz band, and the 5 GHz band. Examples of communication standards that realize such communication include Bluetooth (registered trademark), including BLE (Bluetooth Low Energy), ZigBee (registered trademark), and Wi-Fi (registered trademark).

[0035] The power supply unit 150 is configured to convert alternating current (AC) power supplied from a commercial power supply (100V) into direct current (DC) power and supply the DC power to each component of the detection sensor 100.

[0036] Each of the indicators 148 and 149 (an example of a light-emitting element) is configured to emit light by receiving power supply from the power supply unit 150. Each of the indicators 148 and 149 is configured, for example, by an LED (Light Emitting Diode). The color of light emitted by the indicator 148 and the color of light emitted by the indicator 149 are different from each other. For example, the indicator 148 emits light of a first emission color, and the indicator 149 emits light of a second emission color.

[0037] (1-2-2. Mechanical structure of the detection sensor) FIG. 4 is a perspective view showing a schematic appearance of the detection sensor 100. Referring to FIG. 4, the detection sensor 100 includes a detection sensor body 170 and a cover 175. The detection sensor body 170 and the cover 175 are each substantially circular in plan view. The cover 175 is fixed to the detection sensor body 170 with a plurality of screws. As described above, the detection sensor 100 is installed, for example, on the ceiling of a room. When the detection sensor 100 is installed on the ceiling, at least a part of the detection sensor body 170 is embedded in the ceiling, and the cover 175 is exposed to the room 15. Hereinafter, the cover 175 side of the detection sensor 100 is also referred to as the "lower side", and the detection sensor body 170 side of the detection sensor 100 is also referred to as the "upper side".

[0038] 5 is a diagram showing a schematic view of the detection sensor body 170 as viewed from below. In FIG. 5, only the cover 175 is removed from the detection sensor 100.

[0039] 5, the detection sensor main body 170 includes a control board 180, a first radio wave radar 110, a first radar board 111, a first reflecting member 112, a second radio wave radar 120, a second radar board 121, a second reflecting member 122, a third radio wave radar 130, a third radar board 131, a third reflecting member 132, a fourth radio wave radar 140, a fourth radar board 141, and a fourth reflecting member 142. The detection sensor main body 170 further includes a sensor board 143, a temperature sensor 145, an infrared receiving unit 146, an illuminance sensor 147, and indicators 148 and 149. The sensor board 143, the temperature sensor 145, the infrared receiving unit 146, the illuminance sensor 147, and the indicators 148 and 149 are fixed to a cover 175, as will be described in detail later.

[0040] Control board 180 has a substantially circular shape in a plan view. Note that the shape of control board 180 in a plan view is not limited to this. For example, control board 180 may have a rectangular shape in a plan view. On control board 180, for example, control unit 160 (FIG. 2), first radar board 111, second radar board 121, third radar board 131, fourth radar board 141, and sensor board 143 are mounted.

[0041] The first radio wave radar 110 is mounted on the approximate center of the first radar board 111, and the second radio wave radar 120 is mounted on the approximate center of the second radar board 121. The third radio wave radar 130 is mounted on the approximate center of the third radar board 131, and the fourth radio wave radar 140 is mounted on the approximate center of the fourth radar board 141. Each of the first radar board 111, the second radar board 121, the third radar board 131, and the fourth radar board 141 has a rectangular shape having long sides and short sides, and is mounted on the control board 180. In this example, an example is shown in which the communication unit 116, the control circuit 118, the receiving antenna 114, and the transmitting antenna 113 are mounted on one chip, but this is not limited thereto, and the communication unit 116 and the control circuit 118 may be mounted in a chip, and the receiving antenna 114 and the transmitting antenna 113 may be printed on each radar board, or a wire antenna may be provided separately.

[0042] The first radar board 111 is attached to the control board 180 via a spacer S1, and the second radar board 121 is attached to the control board 180 via a spacer S2. In addition, the third radar board 131 is attached to the control board 180 via a spacer S3, and the fourth radar board 141 is attached to the control board 180 via a spacer S4.

[0043] The first radar board 111, the second radar board 121, the third radar board 131, and the fourth radar board 141 are each arranged at equal angular intervals (90°) in the circumferential direction centered on the center point of the control board 180. That is, in a plan view, the first radar board 111 is arranged at a position symmetrical to the third radar board 131 with respect to the center point of the control board 180, and the second radar board 121 is arranged at a position symmetrical to the fourth radar board 141 with respect to the center point of the control board 180.

[0044] In plan view, a first reflecting member 112 is provided at a position overlapping with the first radar board 111, and a second reflecting member 122 is provided at a position overlapping with the second radar board 121. In addition, in plan view, a third reflecting member 132 is provided at a position overlapping with the third radar board 131, and a fourth reflecting member 142 is provided at a position overlapping with the fourth radar board 141. Each of the first reflecting member 112, the second reflecting member 122, the third reflecting member 132, and the fourth reflecting member 142 is formed, for example, by bending a metal plate (aluminum or the like) having a radio wave absorbing material (epoxy resin, rubber, silicon, or the like containing ferromagnetic powder such as ferrite or carbonyl iron) attached to one surface.

[0045] The first radio wave radar 110 is disposed in an area of ​​the surface of the first reflecting member 112 on the side (acute angle side) where the radio wave absorbing material is attached, and the second radio wave radar 120 is disposed in an area of ​​the surface of the second reflecting member 122 on the side (acute angle side) where the radio wave absorbing material is attached. The third radio wave radar 130 is disposed in an area of ​​the surface of the third reflecting member 132 on the side (acute angle side) where the radio wave absorbing material is attached, and the fourth radio wave radar 140 is disposed in an area of ​​the surface of the fourth reflecting member 142 on the side (acute angle side) where the radio wave absorbing material is attached.

[0046] The first reflecting member 112 limits the transmission range of radio waves by the first radio radar 110 to a detection range A1 (FIG. 1), and the second reflecting member 122 limits the transmission range of radio waves by the second radio radar 120 to a detection range A2. The third reflecting member 132 limits the transmission range of radio waves by the third radio radar 130 to a detection range A3, and the fourth reflecting member 142 limits the transmission range of radio waves by the fourth radio radar 140 to a detection range A4.

[0047] In a plan view, the sensor board 143 does not overlap with each radar board. In addition, in a plan view, the sensor board 143, the temperature sensor 145, the infrared receiving unit 146, the illuminance sensor 147, and the indicators 148 and 149 are each disposed in an obtuse angle side region of the first reflecting member 112, an obtuse angle side region of the second reflecting member 122, an obtuse angle side region of the third reflecting member 132, and an obtuse angle side region of the fourth reflecting member 142. In other words, the first reflecting member 112 is positioned between the sensor board 143, the temperature sensor 145, the infrared receiving unit 146, the illuminance sensor 147, and the indicators 148 and 149, and the first radio wave radar 110. A second reflecting member 122 is located between the second radio wave radar 120 and each of the sensor board 143, temperature sensor 145, infrared receiving unit 146, illuminance sensor 147, and indicators 148, 149. A third reflecting member 132 is located between the third radio wave radar 130 and each of the sensor board 143, temperature sensor 145, infrared receiving unit 146, illuminance sensor 147, and indicators 148, 149. A fourth reflecting member 142 is located between the fourth radio wave radar 140 and each of the sensor board 143, temperature sensor 145, infrared receiving unit 146, illuminance sensor 147, and indicators 148, 149.

[0048] Sensor board 143 has a cross shape. Temperature sensor 145 is mounted approximately in the center of the lower surface of sensor board 143. Infrared receiving unit 146, illuminance sensor 147, and indicators 148 and 149 are each mounted on the lower surface of sensor board 143 so as to surround temperature sensor 145.

[0049] FIG. 6 is a schematic view of the cover 175 from diagonally above. As shown in FIG. 6, a plurality of (four) claw members 176, holes H1, H2, H3, H4, and H5, and a plurality of holes H6 are formed on the upper surface of the cover 175. The plurality of claw members 176 are formed at positions capable of holding each end of the cross-shaped sensor board 143. Each of the plurality of claw members 176 has a portion extending upward from the bottom surface of the cover 175 and a portion protruding radially inward. The sensor board 143 is pressed downward by the portion of each claw member 176 protruding radially inward, thereby holding the sensor board 143.

[0050] Each of the holes H1, H2, H3, H4, and H5 is formed in an area surrounded by a plurality of claw members 176. The hole H1 is formed at a position corresponding to the temperature sensor 145, and the hole H2 is formed at a position corresponding to the illuminance sensor 147. The hole H3 is formed at a position corresponding to the infrared receiving unit 146, and the holes H4 and H5 are formed at positions corresponding to the indicators 149 and 148, respectively. When the sensor board 143 is held by the plurality of claw members 176, at least a part of the temperature sensor 145 is visible from outside the detection sensor 100 through the hole H1, and at least a part of the illuminance sensor 147 is visible from outside the detection sensor 100 through the hole H3. Also, at least a part of the infrared receiving unit 146 is visible from outside the detection sensor 100 through the hole H3, and at least a part of the indicators 149 and 148 are visible from outside the detection sensor 100 through the holes H4 and H5. Each of the multiple (four) holes H6 is a screw hole, and is formed in the vicinity of the outer periphery of the cover 175.

[0051] FIG. 7 is a diagram showing each member fixed to the control board 180 from the side. As shown in FIG. 7, each of the first radar board 111 and the fourth radar board 141 is inclined with respect to the control board 180. For example, this inclination angle is 1° or more and 89° or less, preferably 5° or more and 30° or less, and more preferably 10° or more and 20° or less. Since the upper surfaces of the spacers S1 and S4 are inclined with respect to the control board 180, each of the first radar board 111 and the fourth radar board 141 is inclined with respect to the control board 180. Although not shown in FIG. 7, the second radar board 121 and the third radar board 131 are also inclined with respect to the control board 180.

[0052] Since the first radar board 111 and the fourth radar board 141 are inclined with respect to the control board 180, the first radio radar 110 and the fourth radio radar 140 mounted on the first radar board 111 and the fourth radar board 141 are also inclined with respect to the control board 180, respectively.

[0053] Each radar board is inclined with respect to the control board 180 so as to move away from the ceiling (so as to move closer to the bottom) the closer it gets to the center point of the control board 180. In other words, each radio wave radar is inclined with respect to the control board 180 so as to move away from the ceiling (so as to move closer to the bottom) the closer it gets to the center point of the control board 180.

[0054] Moreover, the lower side of each reflecting member (for example, the first reflecting member 112 and the fourth reflecting member 142) is inclined with respect to the control board 180 so as to move away from the ceiling (toward the bottom) as it approaches the center point of the control board 180. Moreover, a notch portion N1 for avoiding the radar board is formed on the upper side portion of each reflecting member (each of the two sides facing the radar board). Each notch portion N1 is a portion cut downward in the upper side portion of each reflecting member. Thus, in the detection sensor 100, the first radar board 111 and the first reflecting member 112 overlap in a plan view. Moreover, a notch portion N1 for avoiding the first radar board 111 is formed on each of the two sides of the first reflecting member 112 facing the first radar board 111. Therefore, according to the detection sensor 100, by forming the cutout portion N1 in the first reflecting member 112, the first reflecting member 112 and the first radar substrate 111 are arranged more compactly, so that the size of the detection sensor 100 can be prevented from increasing.

[0055] Moreover, the temperature sensor 145, the infrared receiving unit 146, the illuminance sensor 147, and the indicators 148 and 149 are each located below the radio wave radars in the vertical direction and near the lower end of each reflecting member. In particular, the temperature sensor 145 is located at a position where the detection range of the temperature sensor 145 is not limited by each reflecting member. For example, when the temperature sensor 145 is configured by a thermopile, the thermopile is located at a position where the reflecting members are not present within the viewing angle of the thermopile (for example, about 45°). For example, by referring to information on the viewing angle of the thermopile, the height position of the thermopile is determined so that the reflecting members are not present within the viewing angle of the thermopile. The reason why the temperature sensor 145 is located at such a position will be explained in detail later.

[0056] Fig. 8 is a schematic side view of a cross section of the detection sensor 100 installed on the ceiling C1. As shown in Fig. 8, at least a part of the detection sensor body 170 of the detection sensor 100 is embedded in the ceiling C1. In the detection sensor body 170, the control board 180 and the power supply unit 150 are arranged at a predetermined interval in the up-down direction (height direction). By arranging the control board 180 and the power supply unit 150 at a predetermined interval, a heat dissipation effect is obtained.

[0057] On the other hand, the cover 175 of the detection sensor 100 is exposed to the room 15. Among the components included in the detection sensor body 170, at least a part of the radio wave radars such as the first radio wave radar 110 and the fourth radio wave radar 140 is located below the ceiling C1. Therefore, according to the detection sensor 100, even if the ceiling C1 is made of a material with low radio wave transmittance (aluminum, stainless steel, expanded metal, gypsum board, etc., coated with paint containing inorganic substances such as metal, or an aluminum sheet attached to the surface of a resin layer of urethane foam, etc.), the influence of the ceiling C1 on the radio waves emitted by each radio wave radar is limited, so that the detection target can be detected with high accuracy by using each radio wave radar.

[0058] [2. The problem of false positives caused by radio radar] As described above, the first radio wave radar 110, the second radio wave radar 120, the third radio wave radar 130, and the fourth radio wave radar 140 are used to detect the presence or absence of a person in the detection ranges A1, A2, A3, and A4, respectively. However, the present inventor(s) found that there are cases in which the presence or absence of a person in each detection range cannot be detected with sufficiently high accuracy by the radio wave radar alone.

[0059] FIG. 9 is a diagram showing an example of the transition of the output value of the first radio wave radar 110. Referring to FIG. 9, the horizontal axis indicates time, and the vertical axis indicates the output value of the first radio wave radar 110. In this example, an air purifier is placed in the detection range A1. At time t0-t1, no person is present in the detection range A1, and the air purifier is not operating. At time t1-t2, a person waves their hand in the detection range A1, and the air purifier is not operating. At time t2-t3, a person waves their hand in the detection range A1, and the air purifier is operating. At time t3-t4, no person is present in the detection range A1, and the air purifier is operating.

[0060] Suppose that when the output value of the first radio wave radar 110 is equal to or greater than the threshold value, the control unit 160 of the detection sensor 100 determines that a person is present in the detection range A1. In this case, the control unit 160 determines that a person is present in the detection range A1 at time t3-t4, even though no person is present in the detection range A1. That is, a false detection occurs in which the operation of the air purifier is mistaken for the presence of a person. When the state in which the output value of the first radio wave radar 110 is equal to or greater than the threshold value continues for a predetermined time or more, it is not easy to distinguish from the output value of the first radio wave radar 110 whether a person is present in the detection range A1 and the air purifier is operating, or whether no person is present in the detection range A1 and the air purifier is operating. In the detection sensor 100, a temperature sensor 145 is provided to solve such a problem. The same problem occurs even when the device arranged in the detection range A1 is not an air purifier but a circulator or the like.

[0061] Fig. 10 is a diagram for explaining the timing at which the output from each of the radio wave radars and the temperature sensor 145 is used. With reference to the left diagram of Fig. 10, if the state in which the output value of the first radio wave radar 110 is equal to or greater than the threshold does not continue for a predetermined time, the presence or absence of a person in the detection range A1 is determined based on the output value of the first radio wave radar 110. With reference to the center and right diagrams of Fig. 10, if the state in which the output value of the first radio wave radar 110 is equal to or greater than the threshold continues for a predetermined time, the presence or absence of a person in the detection range A1 is determined based on the image data (image data showing the temperature distribution in the detection range A1) output by the temperature sensor 145. This makes it possible to detect the presence or absence of a person in each detection range with relatively high accuracy.

[0062] In this way, in the detection sensor 100 according to the present embodiment, in order to improve the detection accuracy of the detection target, the radio wave radars and the temperature sensor 145 are appropriately used. Meanwhile, the present inventor(s) found that depending on the location of the temperature sensor 145 in the detection sensor 100, it becomes difficult to perform detection over a wide range of the room 15 with one temperature sensor 145.

[0063] Fig. 11 is a diagram for explaining an example of the placement of temperature sensor 145 where it becomes difficult to detect over a wide range in room 15. Referring to Fig. 11, in this example, temperature sensor 145A is placed at a higher position compared to detection sensor 100 according to the present embodiment. As a result, the detection range of temperature sensor 145A is limited by each reflecting member, making it difficult for one temperature sensor 145 to perform detection over a wide range in room 15.

[0064] 7 again, in detection sensor 100 according to the present embodiment, temperature sensor 145 is disposed at a position where the detection range of temperature sensor 145 is not limited by the reflective members. For example, when temperature sensor 145 is configured by a thermopile, the thermopile is disposed at a position where the reflective members are not present within the viewing angle (for example, about 45°) of the thermopile.

[0065] As a result, the detection range of the temperature sensor 145 is not limited by the reflective members, and the detection range of the temperature sensor 145 spans the detection ranges A1, A2, A3, and A4 (FIG. 1). Therefore, according to the detection sensor 100, it is not necessary to provide a separate temperature sensor 145 in each area separated by the reflective members, so that the detection target can be detected with higher accuracy while suppressing an increase in the number of parts. This effect is also achieved with respect to the illuminance sensor 147. Furthermore, if another motion sensor is disposed instead of the illuminance sensor 147 or the temperature sensor 145, the same effect can be achieved with respect to this other motion sensor.

[0066] [3. Radio radar settings] In the detection sensor 100, the gain of the transmission antenna 113 in each of the first radio wave radar 110, the second radio wave radar 120, the third radio wave radar 130, and the fourth radio wave radar 140 can be set (adjusted) individually.

[0067] Fig. 12 is a diagram for explaining the effect of being able to set the gain of the transmitting antenna 113 in each radio wave radar individually. As shown in Fig. 12, by individually setting the gain of the transmitting antenna 113 in each of the first radio wave radar 110, the second radio wave radar 120, the third radio wave radar 130, and the fourth radio wave radar 140, it is possible to individually adjust the range of the transmitted wave. As a result, according to the detection sensor 100, for example, it is possible to individually adjust the width of the detection range of each radio wave radar.

[0068] In addition, in the detection sensor 100, the width of each detection range of the first radio wave radar 110, the second radio wave radar 120, the third radio wave radar 130, and the fourth radio wave radar 140 can also be adjusted by other means.

[0069] FIG. 13 is a diagram for explaining another means for adjusting the width of each detection range. With reference to FIG. 13, for example, the first radio wave radar 110 included in the detection sensor 100 includes two receiving antennas 114. In the detection sensor 100, an angle (for example, angle An1) indicating the position where a person is present is calculated based on the difference between the reception results of each of the two receiving antennas 114. In the detection sensor 100, for example, predetermined angle information (for example, angle An1) is stored in advance. For example, when a person is detected at an angle position smaller than the predetermined angle An1, a detection result signal indicating that a person has been detected is generated, and when a person is detected at an angle position equal to or greater than the predetermined angle An1, a detection result signal indicating that a person has not been detected is generated. In the detection sensor 100, it is possible to set the predetermined angle information. The width of each detection range is also adjusted by setting the predetermined angle information.

[0070] In the detection sensor 100, for example, the gain of the transmitting antenna 113 of each radio wave radar and the setting of the predetermined angle information are each performed via a remote control. In the detection sensor 100, a first mode for setting the gain of the transmitting antenna 113 of each radio wave radar and a second mode for setting the predetermined angle information are prepared.

[0071] Fig. 14 is a flowchart showing the operation when setting each radio wave radar. Referring to Fig. 14, the process shown in this flowchart is executed by the control unit 160 of the detection sensor 100 when an instruction to perform setting for each radio wave radar is accepted via the remote control.

[0072] The control unit 160 determines whether the detection sensor 100 is set to the first mode or the second mode (step S100). If it is determined that the detection sensor 100 is set to the first mode (step S100: "first mode"), the control unit 160 controls the indicator 148 to emit light of a first emission color (step S110). On the other hand, if it is determined that the detection sensor 100 is set to the second mode (step S100: "second mode"), the control unit 160 controls the indicator 149 to emit light of a second emission color (step S120).

[0073] Thereafter, the control unit 160 determines whether or not an instruction to end the setting mode has been accepted via the remote control (step S130). If it is determined that an instruction to end the setting mode has not been accepted (NO in step S130), the process of step S100 is executed again. On the other hand, if it is determined that an instruction to end the setting mode has been accepted (YES in step S130), the process shown in this flowchart ends.

[0074] In this way, in the detection sensor 100, when the detection sensor 100 is set to the first mode, the indicator 148 emits light of the first emission color, whereas when the detection sensor 100 is set to the second mode, the indicator 149 emits light of the second emission color. Therefore, according to the detection sensor 100, the user can visually recognize the current mode of the detection sensor 100.

[0075] [4. Features] As described above, in the detection sensor 100 according to the present embodiment, the temperature sensor 145 is disposed at a position where the detection range of the temperature sensor 145 is not limited by the reflecting members. As a result, the detection range of the temperature sensor 145 is not limited by the reflecting members, and the detection range of the temperature sensor 145 spans the detection ranges A1, A2, A3, and A4 (FIG. 1). Therefore, according to the detection sensor 100, it is not necessary to provide a separate temperature sensor 145 in each region separated by the reflecting members, and it is possible to detect the detection target with higher accuracy while suppressing an increase in the number of parts.

[0076] 5. Other embodiments The concept of the above embodiment is not limited to the embodiment described above. Hereinafter, an example of another embodiment to which the concept of the above embodiment can be applied will be described.

[0077] In the detection sensor 100 according to the above embodiment, light of different emission colors is emitted depending on whether the detection sensor 100 is set to the first mode or the second mode. However, the cause of different emission colors is not limited to this. For example, light of different emission colors may be emitted depending on which of the first radio wave radar 110, the second radio wave radar 120, the third radio wave radar 130, and the fourth radio wave radar 140 is set. For example, the detection sensor 100 may be provided with four indicators, and each indicator may have a different emission color (for example, red, blue, yellow, green). For example, red light may be emitted when the first radio wave radar 110 is set, blue light may be emitted when the second radio wave radar 120 is set, yellow light may be emitted when the third radio wave radar 130 is set, and green light may be emitted when the fourth radio wave radar 140 is set.

[0078] The above describes the embodiments of the present invention by way of example. That is, the detailed description and the accompanying drawings are disclosed for the purpose of illustrative description. Therefore, some components described in the detailed description and the accompanying drawings may be non-essential components for solving the problem. Therefore, just because the non-essential components are described in the detailed description and the accompanying drawings, it should not be immediately determined that the non-essential components are essential.

[0079] Moreover, the above-described embodiments are merely examples of the present invention in every respect. Various improvements and modifications of the above-described embodiments are possible within the scope of the present invention. For example, at least a part of the configuration of any of the embodiments may be combined with at least a part of the configuration of any of the other embodiments. In other words, in implementing the present invention, specific configurations can be appropriately adopted according to the embodiment. [Explanation of symbols]

[0080] 10 lighting system, 15 indoors, 100 detection sensor, 110 first radio wave radar, 111 first radar board, 112 first reflecting member, 113 transmitting antenna, 114 receiving antenna, 116, 135 communication unit, 118 control circuit, 120 second radio wave radar, 121 second radar board, 122 second reflecting member, 130 third radio wave radar, 131 third radar board, 132 third reflecting member, 140 fourth radio wave radar, 141 fourth radar board, 142 fourth reflecting member, 143 sensor board, 145 temperature sensor, 146 infrared receiving unit, 147 illuminance sensor, 148, 149 indicator, 150 power supply unit, 160 control unit, 170 detection sensor body, 175 cover, 176 claw member, 180 control board, 200 Lighting device, A1-A4 detection range, C1 ceiling, H1-H5 hole, H6 hole, N1 cutout, S1-S4 spacer.

Claims

1. a first radio wave radar that detects a detection target by transmitting radio waves and receiving reflected radio waves; a first reflecting member that limits a transmission range of radio waves by the first radio wave radar to a first detection range; a temperature sensor configured to detect a temperature distribution in a predetermined space including at least a portion of the first detection range, The temperature sensor is disposed at a position where a detection range of the temperature sensor is not limited by the first reflecting member.

2. a second radio wave radar that detects the detection target by transmitting radio waves and receiving reflected radio waves; a second reflecting member that limits a transmission range of the radio waves by the second radio wave radar to a second detection range, The predetermined space further includes at least a portion of the second detection range, the temperature sensor is disposed at a position where a detection range of the temperature sensor is not limited by the second reflecting member, The detection sensor according to claim 1 , wherein, in a plan view, the first reflecting member is located between the temperature sensor and the first radio wave radar, and the second reflecting member is located between the temperature sensor and the second radio wave radar.

3. A reception unit that receives settings related to the operation of the detection sensor; a light-emitting element that emits light of the first emission color and the second emission color, There are a first mode and a second mode as modes for the setting, The content of the operation set in the first mode and the content of the operation set in the second mode are different from each other, 3. The detection sensor according to claim 1, wherein when the detection sensor is set to the first mode, the light-emitting element emits light of the first emission color, and when the detection sensor is set to the second mode, the light-emitting element emits light of the second emission color.

4. The detection sensor is installed so that a portion of the sensor is embedded in the ceiling, The detection sensor according to claim 1 or 2, wherein in a state where the detection sensor is installed, at least a portion of the first radio wave radar is located below the ceiling.

5. the first radio wave radar is mounted on a first radar board, The first reflecting member is formed by bending a single plate, In a plan view, the first radar substrate and the first reflecting member overlap each other, 3 . The detection sensor according to claim 1 , wherein each of two sides of the first reflecting member facing the first radar board has a notch formed therein for avoiding the first radar board.

Images