Lighting equipment and antenna arrangement for lighting equipment

Abstract

To realize a lighting device with a communication antenna arrangement that ensures communication sensitivity regardless of the orientation of the light fixture or the direction of communication. [Solution] The lighting device 100 comprises a base 20 connected to a wiring device via a support 23, and a lamp body 10 connected to the base 20 via an arm 15. The base 20 or the lamp body 10 has a housing 11, 21 and an electronic circuit 18 housed in the housing 11, 21. The electronic circuit 18 has a circuit board 181 and a communication circuit 182 mounted on the circuit board 181. The communication circuit 182 is realized by positioning the circuit board 181 on a surface 181C that is far from the housing 11 in a direction CO perpendicular to the axial direction UD of the housing 11.

Description

Technical Field

[0001] The present invention relates to a lighting device and antenna arrangement for a lighting device. Background Art

[0002] Conventionally, a lighting device as shown in Patent Document 1 has been proposed. For example, Patent Document 1 discloses a lighting device including: a support portion including an electric first drive source; an arm portion having one end in an extending direction supported by the support portion, being rotatable around a first rotation axis along the extending direction by the first drive source, and including an electric second drive source; and a reinforcing portion provided inside the arm portion to reinforce the arm portion. An operation target is attached to the other end side of the arm portion, and a drive device is provided that is rotatable around a second rotation axis intersecting the extending direction by the second drive source. Prior Art Documents Patent Documents

[0003] Patent Document 1 Japanese Unexamined Patent Application Publication No. 2017-195154 Summary of Invention Problems to be Solved by the Invention

[0004] Meanwhile, when downsizing a lighting device, if a communication antenna for performing communication with the outside to operate the lighting device is also housed in the casing, the following problems have been clarified to exist. That is, when a metal with excellent thermal conductivity is used for the casing, the shielding loss caused by the casing also increases, which leads to the problem of reduced communication sensitivity of the communication antenna housed in the casing. In addition, when changing the vertical orientation of the lamp body, depending on the positional relationship between the casing and the communication antenna, it may become difficult to perform communication with the outside.

[0005] This invention has been made in view of the above problems, and aims to realize a lighting device having a communication antenna arranged in the housing that can ensure communication sensitivity. [Means for solving the problem]

[0006] A typical embodiment of the present invention provides a lighting device comprising a base connected to a wiring device via a support, and a lamp body connected to the base via an arm, wherein the base or the lamp body comprises a housing and an electronic circuit housed in the housing, the electronic circuit comprising a circuit board and a communication circuit mounted on the circuit board, and the communication circuit is located on the side of the circuit board that is far from the housing in a direction perpendicular to the axial direction of the housing. [Effects of the Invention]

[0007] According to one aspect of the present invention, it is possible to realize a lighting device having a communication antenna arranged in the housing that can ensure communication sensitivity. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows an example of the configuration of a lighting device according to an embodiment. [Figure 2] This figure shows the state in which the light fixture and base of the lighting device according to the embodiment are in a straight line. [Figure 3] This figure shows the state in which the lamp body and base of the lighting device according to the embodiment are at a certain angle. [Figure 4] This figure shows the state in which the lamp body and base of the lighting device according to the embodiment are at a right angle. [Figure 5] This figure shows the lighting device according to the embodiment with the housing and cover of the light unit omitted. [Figure 6] This diagram shows the light fixture with its housing and cover omitted, while the light fixture and its base are at a certain angle. [Figure 7] This is a plan view of an electronic circuit. [Figure 8] This is a plan view of the electronic circuit from the opposite side of Figure 7. [Figure 9] This is a diagram showing the configuration of a communication circuit. [Figure 10] This diagram shows the relative positions of the housing, arm, and electronic circuitry in the radial direction of the light fixture. [Figure 11] This figure shows the positional relationship between the housing, arm, and electronic circuit when the communication circuit is arranged differently from that shown in Figure 10. [Figure 12] This diagram shows the positional relationship between the housing, arm section, and electronic circuitry when the communication circuit is placed in a specific location. [Figure 13] This figure shows the positional relationship between the housing, arm, and electronic circuit when a portion of the circuit board in Figure 12 is a ground pattern. [Figure 14] This diagram shows the positional relationship between the housing, arm section, and electronic circuit when the communication circuit is placed in a different position than shown in Figure 13. [Figure 15] This diagram shows the positional relationship between the housing, arm section, and electronic circuit when the communication circuit is placed in a different position than shown in Figures 13 and 14. [Figure 16] These graphs show the simulation results of the average electric field strength when the communication circuit configurations shown in Figures 12 to 15 are used. [Modes for carrying out the invention]

[0009] <<Specific Examples of Embodiments>> Specific examples of embodiments of the present invention will be described below with reference to the drawings. In the following description, common components in each embodiment will be denoted by the same reference numerals, and repeated explanations will be omitted. It should also be noted that the drawings are schematic, and the dimensional relationships and ratios of each element may differ from reality. There may also be parts where the dimensional relationships and ratios differ between drawings.

[0010] <<Lighting System Configuration>> Figure 1 shows an example of the configuration of a lighting device according to an embodiment. Figure 2 is a diagram showing a state where the lamp body part and the base part of the lighting device according to the embodiment are aligned on a straight line. Figure 3 is a diagram showing a state where the lamp body part and the base part of the lighting device according to the embodiment form a fixed angle. Figure 4 is a diagram showing a state where the lamp body part and the base part of the lighting device according to the embodiment are at a right angle. Figure 5 is a diagram showing a state where the housing and the cover of the lamp body part of the lighting device according to the embodiment are omitted. Figure 6 is a diagram showing a state where the housing and the cover of the lamp body part are omitted in a state where the lamp body part and the base part form a fixed angle.

[0011] First, the configuration of the lighting device 100 according to the present embodiment will be described. The lighting device 100 shown in Figures 1 to 6 is, for example, a device connected to a duct rail mounted on the ceiling of a building, for irradiating a specific area of the building. The lighting device 100 includes a base part 20 and a lamp body part 10. Specifically, the lighting device 100 is connected to the duct rail via a support 23 attached to the base part 20. The lighting device 100 irradiates a specific area of the building with light output from the light source unit 13 included in the lamp body part 10.

[0012] Note that, as shown in Figures 2 to 4, the axis passing through the center of the opening surface of the housing 21 of the base part 20 is defined as axis X, and the axis passing through the center of the opening surface of the housing 11 of the lamp body part 10 is defined as axis Y. Further, as shown in Figures 2 to 4, the direction along the axis Y is defined as the axial direction UD, and in the axial direction UD, the side approaching the base part 20 is defined as the upper U side, and the side moving away from the base part 20 is defined as the lower D side. Further, the direction perpendicular to the axis Y is defined as the direction CO perpendicular to the axis Y (hereinafter also referred to as "radial direction CO"), and in the direction CO perpendicular to the axis Y, the side approaching the axis Y is defined as the center C side, and the side moving away from the axis Y is defined as the outer O side. Note that the upper U side, lower D side, center C side, and outer O side are also applied to the axis X.

[0013] The base 20 is connected to a duct rail (not shown) via a support 23 and receives power from the duct rail. Furthermore, the base 20 houses a motor and can rotate about axis X. In other words, the base 20 can perform panning motion using the motor. Furthermore, the base portion 20 is connected to the light body portion 10 via the arm portion 15. The base 20 includes a housing 21, a top plate 22, a support 23, and a bottom plate 24.

[0014] The housing 21 is a metal component formed in the shape of a cylinder. The housing 21 houses electronic circuits and motors (not shown) inside. In this embodiment, the housing 21 is cylindrical, but the shape of the housing 21 is not limited to this, and it may be a rectangular tube.

[0015] The top plate 22 is a disc-shaped component that is attached to the opening on the upper U side of the housing 21. A support bracket 23 is attached to the top plate 22 on the upper U side. The support member 23 is a component for connecting the lighting device 100 (base 20) to the duct rail. The support member 23 has a central hook portion 231 and side hook portions 232.

[0016] The central hook portion 231 is attached to the center of the top plate 22. The central hook portion 231 can connect the lighting device 100 to the duct rail by rotating the base portion 20 about axis X. The central hook portion 231 is equipped with a conductive terminal and can receive power by contacting the conductive part of the duct rail.

[0017] The side hook portion 232 is attached across the housing 21 and the top plate 22. The side hook portion 232, together with the central hook portion 231, is a component for connecting the base portion 20 and the duct rail. In other words, the side hook portion 232 can reinforce the connection between the base portion 20 and the duct rail by the central hook portion 231 by hooking the claw-shaped member onto the lower surface D of the duct rail.

[0018] The bottom plate 24 is a disc-shaped member that is attached to the opening on the lower D side of the housing 21. The arm section 15 is attached to the base plate 24.

[0019] The lighting unit 10 is connected to the base unit 20 via an arm unit 15 it has, and illuminates a specific area of ​​the building with light emitted from the light source unit 13 it has inside. Furthermore, the lamp body 10 is rotatable around an axis perpendicular to the axis X along the axial direction of the base 20 by a drive source 17 housed inside. In other words, the lamp body 10 can perform a tilt operation around an axis perpendicular to the axis X of the base 20 by the drive source 17. The light fixture unit 10 includes a housing 11, an optical element 12, a light source unit 13, a cover 14, an arm unit 15, a base unit 16, a drive source 17, and an electronic circuit 18.

[0020] The housing 11 is a metal component formed in the shape of a cylinder. The housing 11 has a cylindrical portion 111 and a notched portion 112. In this embodiment, the housing 11 is cylindrical, but the shape of the housing 11 is not limited to this, and it may be a rectangular tube.

[0021] The cylindrical portion 111 is a metal component formed in a cylindrical shape, and houses the optical element 12, the light source 13, the cover 14, the base portion 16, the drive source 17, and the electronic circuit 18 inside. Furthermore, the cylindrical portion 111 retracts the arm portion 15 inward at an angle where the axis X and axis Y coincide (see Figure 2), and as the angle between the axis X and axis Y increases (see Figures 3 and 4), a portion of the arm portion 15 is exposed outward from the notch 112.

[0022] The notch 112 is a portion formed by cutting out a part of the cylindrical portion 111. The notch 112 is located on the upper U side of the cylindrical portion 111. The size of the notch 112 can be adjusted as needed to match the size of the arm portion 15.

[0023] The optical element 12 is mounted in the opening on the lower D side of the housing 11 and consists of a reflector and a lens. It refracts the light output from the light source unit 13 mounted on the upper U side to adjust the illumination state. However, the configuration of the optical element 12 is not limited to this.

[0024] The light source unit 13 is a component that outputs light to illuminate a specific area of ​​a building. The light source unit 13 includes a light source support 131 and a light source 132.

[0025] The light source support 131 is a component for attaching the light source 132 to the base portion 16. The light source support 131 is attached to the lower D side surface of the base portion 16. The light source 132 is a light-emitting device that emits light to illuminate a specific area of ​​a building. In this embodiment, the light source 132 is an LED (light-emitting diode), but it is not limited to this, and may be an OLED (organic light-emitting diode), an HID (high intensity discharge) lamp, or a laser light source, for example.

[0026] The cover 14 is attached to the opening on the upper U side of the housing 11 and is a component that protects the drive source 17 and electronic circuit 18 from dust. The cover 14 is provided with slits to efficiently dissipate the heat generated by the light source 13, the drive source 17, and the electronic circuit 18.

[0027] The arm portion 15 is composed of a metal-containing member for connecting the lamp body portion 10 and the base portion 20. The arm portion 15 is a member for performing the tilting motion of the lamp body portion 10 by the operation of the drive source 17. The arm portion 15 includes a connecting portion 151 and a rotating gear 152.

[0028] The connecting portion 151 is a component for connecting the arm portion 15 to the bottom plate 24 and the base portion 16. A rotating gear 152 is provided in the outer O region on the lower D side of the connecting portion 151.

[0029] The rotating gear 152 is the part that rotates the drive source 17 side relative to the arm portion 15 based on the power transmitted from the drive source 17. Specifically, the rotating gear 152 has a shape that meshes with a gear connected to the drive source 17, and by rotating the drive source 17 side relative to the arm portion 15 using the rotating gear 152, the lamp body portion 10 can be rotated relative to the base portion 20.

[0030] The base portion 16 is mounted approximately in the center of the axial direction UD of the housing 11 and is a member for fixing each component housed inside the housing 11. The base unit 16 includes a lamp base 161, a motor base 162, and a circuit mounting section 163.

[0031] The lamp base 161 is a disc-shaped component to which the optical element 12, light source unit 13, cover 14, and arm unit 15 are attached. Furthermore, the lamp body base 161 is provided with a motor base 162 and a circuit mounting section 163.

[0032] The motor base 162 is provided on the upper U-side surface of the lamp body base 161 and is a component for attaching the drive source 17.

[0033] The circuit mounting section 163 is provided on the upper U-side surface of the lamp base 161 and is a component for mounting the electronic circuit 18.

[0034] The drive source 17 is a component that provides power to rotate the arm portion 15. The drive source 17 is attached to the base portion 16 by a motor base 162. In this embodiment, the drive source 17 is a stepping motor, but the drive source 17 is not limited to this and may be a servo motor or a DC motor.

[0035] The electronic circuit 18 is a circuit for controlling the light source unit 13 and the drive source 17. The electronic circuit 18 is attached to the base unit 16 by the circuit mounting unit 163. The detailed configuration of the electronic circuit 18 will be described later. Furthermore, the electronic circuit 18 is not limited to being housed in the housing 11 of the light fixture 10, but may also be housed in the housing 21 of the base 20.

[0036] As shown in Figures 2 to 4, the lamp body 10 tilts around an axis perpendicular to the axis X that runs along the axial direction of the base 20. Specifically, as shown in Figure 2, if the angle at which axis X and axis Y coincide is defined as 0 degrees, the light unit 10 can rotate starting from the base 20 until the angle between axis X and axis Y reaches 90 degrees, as shown in Figure 4.

[0037] <<Electronic Circuit Configuration>> Figure 7 is a plan view of the electronic circuit. Figure 8 is a plan view of the electronic circuit from the opposite side of Figure 7. Figure 9 shows the configuration of the communication circuit.

[0038] Next, the configuration of the electronic circuit 18 according to this embodiment will be described.

[0039] The electronic circuit 18 is a circuit for controlling the light source unit 13 and the drive source 17. Specifically, the electronic circuit 18 controls the tilt angle of the light fixture 10, as well as the ON / OFF status and intensity (light quantity) of the light illuminating a specific area of ​​the building, through the control of the light source 13 and the drive source 17. The electronic circuit 18 includes a circuit board 181 and a communication circuit 182.

[0040] The circuit board 181 is a printed circuit board on which electronic components for controlling the light source unit 13 and the drive source 17 are mounted. As will be described later, the circuit board 181 can have a ground pattern GP in part or all of its area (see Figures 13, 14, and 15). The circuit board 181 has a surface 181O (hereinafter referred to as the "outer surface 181O") that is close to the housing 11, and a surface opposite to the surface 181O that is close to the housing 11 (hereinafter referred to as the "inner surface 181C"), that is, a surface 181C that is farther from the housing 11.

[0041] The outer surface 181O is the outer surface O side of the circuit board 181 in the radial direction CO, and is a surface that does not face the arm portion 15 or the axis Y (see Figures 10 and 11).

[0042] The inner surface 181C is the surface of the circuit board 181 on the side of the center C in the radial direction CO, and is the surface facing the arm portion 15 and the axis Y (see Figures 10 and 11).

[0043] The communication circuit 182 is a circuit for enabling wireless communication with equipment located outside the lighting device 100. The communication circuit 182 is mounted on the circuit board 181. The communication circuit 182 can communicate in accordance with various wireless communication standards, such as IEEE 802.15.1 (Bluetooth®). Examples of wireless communication standards include, but are not limited to, IEEE 802.15.1, IEEE 802.11 (Wi-Fi®), and IEEE 802.15.4 (ZigBee®). The communication circuit 182 can conform to any wireless communication standard. The communication circuit 182 includes a circuit board 1821, a communication core circuit 1822, and a communication antenna 1823.

[0044] The circuit board 1821 is a circuit board on which electronic components for realizing wireless communication with equipment located outside the lighting device 100 are mounted. The substrate portion 1821 is soldered to the circuit board 181. The circuit board 1821 is equipped with a communication core circuit 1822 and a communication antenna 1823.

[0045] The communication core circuit 1822 is a circuit mounted on the lower D side in the axial direction UD of the substrate portion 1821. The communication core circuit 1822 has a shielded case, and inside the shielded case are housed communication chips and circuits for wireless communication.

[0046] The communication antenna 1823 is mounted on the upper U side in the axial direction UD of the substrate portion 1821 and is an antenna for wireless communication with equipment located outside the lighting device 100. In this embodiment, the communication antenna 1823 is a pattern antenna directly formed on the central C side of the radial CO direction of the substrate portion 1821. However, the communication antenna 1823 may be a chip antenna instead of a pattern antenna.

[0047] <<Optimal configuration for communication antenna circuit board>> Figure 10 shows the relative positions of the housing, arm, and electronic circuit in the radial direction of the light fixture. Figure 11 shows the positional relationship between the housing, arm, and electronic circuit of the reference example, when the communication circuit is arranged differently from that in Figure 10.

[0048] Next, we will describe the optimal configuration of the communication antenna 1823 on the circuit board 181.

[0049] In Figures 10 and 11, the housing 11 is positioned on the outer side O in the radial direction CO, and the arm portion 15 is positioned on the central side C in the radial direction CO. Furthermore, in Figures 10 and 11, the electronic circuit 18 is positioned between the housing 11 and the arm portion 15 in the radial direction CO.

[0050] The difference between Figure 10 and Figure 11 is the arrangement of the communication circuit 182 in the radial direction CO relative to the circuit board 181. In other words, in Figure 10, the communication circuit 182 is attached to the inner surface 181C of the circuit board 181 (the surface on the center C side in the radial direction CO of the circuit board 181), whereas in Figure 11, the communication circuit 182 is attached to the outer surface 181O of the circuit board 181 (the surface on the outer O side in the radial direction CO of the circuit board 181).

[0051] In both Figures 10 and 11, the circuit board portion 1821 of the communication circuit 182 is directly attached to the circuit board 181. Furthermore, in both Figures 10 and 11, the communication core circuit 1822 is mounted on the side of the substrate portion 1821 opposite to the side attached to the circuit board 181. Furthermore, in both Figures 10 and 11, the communication antenna 1823 is attached to the side of the substrate portion 1821 opposite to the side attached to the circuit board 181.

[0052] Furthermore, in both Figures 10 and 11, the communication circuit 182 is attached to the end 181F of the circuit board 181 in the radial direction CO, which is the end 181F that is further away from the arm portion 15.

[0053] Thus, when a communication circuit 182, which includes a communication antenna 1823 for communicating with the outside, is housed in the same enclosure 11, the shielding loss due to the enclosure 11 becomes large, and the communication antenna 1823 is placed in an environment where its communication sensitivity is reduced. Therefore, the inventors of the present invention compared the average electric field strength of the communication antenna 1823 when the communication circuit 182 was arranged as shown in Figure 10 and when the communication circuit 182 was arranged as shown in Figure 11.

[0054] As a result, as shown in Figure 10, the inventors of this invention have found that the average electric field strength of the communication antenna 1823 is higher when the communication circuit 182 is mounted on the inner surface 181C of the circuit board 181 (the surface on the center C side in the radial direction CO of the circuit board 181) than when it is mounted on the outer surface 181O of the circuit board 181 (the surface on the outer O side in the radial direction CO of the circuit board 181). Furthermore, the inventors of this application have confirmed that when the communication circuit 182 is attached to the inner surface 181C of the circuit board 181 (the surface on the side of the center C in the radial direction CO of the circuit board 181), communication with the outside can be performed without any problems.

[0055] The reason why the average electric field strength of the communication antenna 1823 is higher when the communication circuit 182 is mounted on the inner surface 181C of the circuit board 181 (the surface on the center C side in the radial direction CO of the circuit board 181) than when it is mounted on the outer surface 181O of the circuit board 181 (the surface on the outer O side in the radial direction CO of the circuit board 181) is presumed to be because when the communication circuit 182 is mounted on the inner surface 181C of the circuit board 181 (the surface on the center C side in the radial direction CO of the circuit board 181), it is possible to move the communication circuit 182 further away from the shielding housing 11.

[0056] <<Circuit Board Configuration>> Figure 12 shows the positional relationship between the housing, arm section, and electronic circuit in Reference Example 1, where the communication circuit is placed in a specific location. Figure 13 shows the positional relationship between the housing, arm, and electronic circuit in Reference Example 2, where a portion of the circuit board in Figure 12 is a ground pattern. Figure 14 shows the positional relationship between the housing, arm, and electronic circuit when a portion of the circuit board in Figure 12 is a ground pattern. Figure 15 shows the positional relationship between the housing, arm section, and electronic circuit in Reference Example 3, where the communication circuit is positioned differently from that shown in Figures 13 and 14. Figure 16 is a graph showing the simulation results of the average electric field strength when the communication circuit configurations shown in Figures 12 to 15 are used.

[0057] Next, we will describe the optimal configuration of the circuit board 181.

[0058] Figures 12 to 15 show the base portion 16 housed in the housing 11, and the arm portion 15 and electronic circuit 18 attached to the base portion 16. Furthermore, in Figures 12 to 15, the communication circuit 182 is located in the upper half of the circuit board 181 in the axial direction UD (hereinafter referred to as "upper region 1811U").

[0059] The differences between Figures 12 to 15 are the arrangement of the communication circuit 182 on the circuit board 181 and the area of ​​the circuit board 181 that is the ground pattern GP.

[0060] In other words, in Figures 12, 13, and 15, the communication circuit 182 is located on the side of the end 181N, 181F of the circuit board 181 in the radial direction CO that is closer to the arm portion 15 (hereinafter referred to as "end 181N"). On the other hand, in Figure 14, the communication circuit 182 is located on the side of the end 181N, 181F of the circuit board 181 in the radial direction CO that is farther from the arm portion 15 (hereinafter referred to as "the other end 181F").

[0061] Furthermore, in Figures 12 and 13, the communication circuit 182 is located on the outer surface 181O of the circuit board 181 in the radial direction CO of the housing 11. On the other hand, in Figures 14 and 15, the communication circuit 182 is located on the inner surface 181C of the circuit board 181 in the radial direction CO of the housing 11.

[0062] Furthermore, in Figure 12, the entire region of the circuit board 181, including both the outer surface 181O and the inner surface 181C (hereinafter referred to as "the entire region 1811"), is a ground pattern GP. On the other hand, in Figures 13, 14, and 15, the upper region 1811U of the circuit board 181 is the ground pattern GP.

[0063] In other words, in Figures 13, 14, and 15, the inner surface 181C of the circuit board 181 has a ground pattern GP in its upper region 1811U, and the outer surface 181O of the circuit board 181 also has a ground pattern GP in its upper region 1811U. Furthermore, in Figures 13, 14, and 15, the inner surface 181C of the circuit board 181 has a ground pattern GP in the lower half of the region (hereinafter referred to as "lower region 1811D") in the axial direction UD, and the outer surface 181O of the circuit board 181 also has a ground pattern GP in the lower region 1811D.

[0064] Thus, when the circuit board 181 on which the communication circuit 182, which has the communication antenna 1823 attached, is attached is mounted in close proximity to the metal arm portion 15 inside the housing 11, shielding loss may occur due to the arm portion 15, and the communication antenna 1823 is placed in an environment where a decrease in communication sensitivity may occur. Therefore, the inventors of the present invention compared the average electric field strength of the communication antenna 1823 when the communication circuit 182 was configured as shown in Figures 12 to 15.

[0065] Figure 16 is a graph showing the simulation results of the average electric field strength when the lighting unit 10 is tilted around an axis perpendicular to the axis X along the axial direction, and the angle of the lighting unit 10 relative to the base 20 is changed to 0 degrees, 5 degrees, 45 degrees, and 90 degrees, assuming the communication circuit configuration shown in Figures 12 to 15.

[0066] When the angle of the light fixture 10 with respect to the base 20 is 0 degrees, the lighting device 100 is in the state shown in Figure 2. When the angle of the light fixture 10 with respect to the base 20 is 45 degrees, the lighting device 100 is in the state shown in Figure 3. When the angle of the light fixture 10 with respect to the base 20 is 90 degrees, the lighting device 100 is in the state shown in Figure 4.

[0067] The average electric field strength is smallest at V1 (dBμV / m), and increases sequentially from V2 (dBμV / m) to V8 (dBμV / m). In other words, the average electric field strength is largest at V8 (dBμV / m).

[0068] As shown in Figure 16, the inventors of this invention have found that the configuration of the circuit board 181 in Figure 14 yields the best average electric field strength. In other words, the inventors of this invention have found that the best average electric field strength can be obtained when the circuit board 181 is configured such that the communication circuit 182 is placed on the inner surface 181C of the circuit board 181, which is on the other end 181F side of the ends 181N and 181F of the circuit board 181 in the radial CO direction, and the upper region 1811U of the circuit board 181 is the ground pattern GP.

[0069] Specifically, the configuration of the circuit board 181 in Figure 14 yields a better average electric field strength than the configurations of the circuit board 181 in Figures 12, 13, and 15 when the angle of the lamp unit 10 relative to the base 20 is 0 degrees, 5 degrees, and 45 degrees. This was revealed by the results in Figure 16. When the angle of the lamp body 10 with respect to the base 20 is 90 degrees, the configuration of the circuit board 181 in Figure 15 yields a better average electric field strength than the configuration of the circuit board 181 in Figure 14, but the difference is small, as can be seen from the results in Figure 16.

[0070] When the angle of the light unit 10 with respect to the base 20 is close to 0 degrees, the opening on the upper U side of the housing 11 is covered by the base 20, and the gap between the notch 112 and the arm 15 becomes smaller, resulting in an environment where the communication sensitivity is particularly significantly reduced.

[0071] Under these conditions, the configuration of circuit board 181 in Figure 14 consistently yields a superior average electric field strength compared to the configurations of circuit board 181 in Figures 12, 13, and 15, as can be seen from the results in Figure 16. Therefore, the configuration of the circuit board 181 in which the communication circuit 182 is placed on the inner surface 181C of the circuit board 181 in the radial CO direction, on the other end 181F of the ends 181N and 181F of the circuit board 181, and in the radial CO direction of the housing 11, and the upper region 1811U of the circuit board 181 is the ground pattern GP, ​​is the configuration in which the best average electric field strength can be obtained.

[0072] Furthermore, the inventors of this invention have confirmed that when the circuit board 181 is configured such that the communication circuit 182 is placed on the inner surface 181C of the circuit board 181, which is on the other end 181F of the ends 181N and 181F of the circuit board 181 in the radial CO direction, and the upper region 1811U of the circuit board 181 is a ground pattern GP, ​​the average electric field strength necessary to realize communication with the outside can be obtained.

[0073] As described above, the lighting device 100 according to this embodiment comprises a base 20 connected to a wiring device via a support 23, and a lamp body 10 connected to the base 20 via an arm 15. The base 20 or the lamp body 10 has housings 11, 21 and an electronic circuit 18 housed in the housings 11, 21. The electronic circuit 18 has a circuit board 181 and a communication circuit 182 attached to the circuit board 181. The communication circuit 182 is located on the surface 181C of the circuit board 181 that is far from the housing 11 in a direction CO perpendicular to the axial direction UD of the housing 11.

[0074] According to this, the communication circuit 182 can be moved away from the shielding housing 11, and the decrease in the average electric field strength of the communication circuit 182 can be mitigated. Therefore, it is possible to realize a lighting device 100 having a communication antenna 1823 arranged in such a way that communication sensitivity can be ensured regardless of the orientation or communication direction of the light fixture 10.

[0075] Furthermore, as described above, the lighting device 100 according to this embodiment comprises a base 20 connected to a wiring device via a support 23, and a lamp body 10 connected to the base 20 via an arm 15. The base 20 or the lamp body 10 has a housing 11, 21 and an electronic circuit 18 housed in the housing 11, 21. The electronic circuit 18 has a circuit board 181 and a communication circuit 182 attached to the circuit board 181. The communication circuit 182 is located on the side of the end 181F of the circuit board 181, which is further from the arm 15, in the direction CO perpendicular to the axial direction UD of the housing 11.

[0076] According to this, the communication circuit 182 can be moved away from the shielding arm portion 15, thereby mitigating the decrease in the average electric field strength of the communication circuit 182.

[0077] Furthermore, in the lighting device 100 according to this embodiment, the communication circuit 182 is located in the upper half of the circuit board 181 on the axial direction UD, 1811U.

[0078] According to this, the distance between the communication circuit 182 and the notch 112 can be reduced, and the decrease in the average electric field strength of the communication circuit 182 can be mitigated.

[0079] Furthermore, in the lighting device 100 according to this embodiment, the circuit board 181 has a ground pattern GP in the upper half of the region 1811U in the axial direction UD.

[0080] According to this, by making the ground pattern GP only in appropriate locations around the communication circuit 182, depending on the communication frequency, the noise reduction effect of the ground pattern GP can be enhanced.

[0081] Furthermore, in the lighting device 100 according to this embodiment, the central C side surface 181C of the circuit board 181 in the direction CO perpendicular to the axial direction UD has a ground pattern GP in the upper U side half region 1811U in the axial direction UD, and the outer O side surface 181O of the circuit board 181 in the direction CO perpendicular to the axial direction UD has a ground pattern GP in the upper U side half region 1811U in the axial direction UD.

[0082] According to this, by making both sides of the upper half of the region 1811U in the axial direction UD a ground pattern GP, ​​the noise reduction effect of the ground pattern GP can be enhanced regardless of the directivity of the communication antenna 1823.

[0083] Furthermore, in the lighting device 100 according to this embodiment, the communication circuit 182 includes a substrate portion 1821, a communication core circuit 1822 attached to the substrate portion 1821, and a communication antenna 1823 attached to the substrate portion 1821, wherein the communication antenna 1823 is located closer to the center C than the circuit board 181 in the direction CO perpendicular to the axial direction UD.

[0084] According to this, the communication antenna 1823 can be moved away from the shielding housing 11, and the decrease in the average electric field strength of the communication circuit 182 can be mitigated.

[0085] Furthermore, in the lighting device 100 according to this embodiment, the lamp body 10 has a drive source 17 and is rotatable by the drive source 17 around an axis perpendicular to the axis X along the axial direction of the base 20.

[0086] According to this, the tilt operation of the light fixture 10 can be achieved around an axis perpendicular to the axis X along the axial direction, via wireless communication with equipment located outside the lighting device 100.

[0087] <<Extension of the Embodiment>> Although the present inventors have described the invention in detail based on embodiments, it goes without saying that the present invention is not limited thereto and can be modified in various ways without departing from its essence.

[0088] For example, the communication core circuit 1822 and communication antenna 1823 in this embodiment are configured to be attached to the substrate 1821, but the invention is not limited to this configuration. In other words, the communication core circuit 1822 and the communication antenna 1823 may be directly attached to the circuit board 181. [Explanation of Symbols]

[0089] 10...Lighting unit, 11...Housing, 12...Optical element, 13...Light source unit, 14...Cover, 15...Arm unit, 16...Base unit, 17...Drive source, 18...Electronic circuit, 20...Base unit, 21...Housing, 22...Top plate, 23...Support, 24...Bottom plate, 100...Lighting device, 111...Cylindrical unit, 112...Notch, 131...Light source support, 132...Light source, 151...Connection unit, 152...Rotating gear, 161...Lighting unit base, 162...Motor Base, 163...Circuit mounting area, 181...Circuit board, 181C, 181O...Surface of the circuit board, 181F, 181N...Edge of the circuit board, 182...Communication circuit, 231...Center hook area, 232...Side hook area, 1811D...Lower half of the circuit board, 1811U...Upper half of the circuit board, 1821...Board area, 1822...Communication core circuit, 1823...Communication antenna, GP...Ground pattern

Claims

1. A base that is connected to the wiring device via a support, A light fixture connected to the base via an arm, Equipped with, The base or the light body comprises a housing and an electronic circuit housed in the housing. The aforementioned electronic circuit comprises a circuit board and a communication circuit mounted on the circuit board. The communication circuit is located on the side of the circuit board that is farther from the housing in a direction perpendicular to the axial direction of the housing. Lighting device.

2. A base that is connected to the wiring device via a support, A light fixture connected to the base via an arm, Equipped with, The base or the light body comprises a housing and an electronic circuit housed in the housing. The aforementioned electronic circuit comprises a circuit board and a communication circuit mounted on the circuit board. The communication circuit is located on the side of the end of the circuit board that is furthest from the arm portion, in a direction perpendicular to the axial direction of the housing. Lighting device.

3. In the lighting device according to claim 1 or 2, The communication circuit is located in the upper half of the circuit board in the axial direction. Lighting device.

4. In the lighting device according to claim 3, The circuit board has a ground pattern in the upper half of the region in the axial direction. Lighting device.

5. In the lighting device according to claim 4, The central surface of the circuit board in a direction perpendicular to the axial direction has a ground pattern in its upper half in the axial direction. The outer surface of the circuit board in a direction perpendicular to the axial direction has a ground pattern in the upper half of the region in the axial direction. Lighting device.

6. In the lighting device according to claim 1 or 2, The communication circuit comprises a circuit board, a communication core circuit mounted on the circuit board, and a communication antenna mounted on the circuit board. The communication antenna is located on the central side of the circuit board in a direction perpendicular to the axial direction. Lighting device.

7. In the lighting device according to claim 1 or 2, The lamp body has a drive source and is rotatable by the drive source around an axis perpendicular to the axis along the axial direction of the base. Lighting device.

8. An antenna structure for a lighting device, The lighting device comprises a base connected to a wiring device via a support, and a light body connected to the base via an arm. The light unit comprises a housing, a light source housed in the housing, and an electronic circuit housed in the housing. The aforementioned electronic circuit comprises a circuit board and a communication circuit mounted on the circuit board. The communication circuit comprises a circuit board, a communication core circuit mounted on the circuit board, and a communication antenna mounted on the circuit board. The communication antenna is located on the central side of the circuit board in a direction perpendicular to the axial direction of the housing. Antenna structure.

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