JP2017168409A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of adjusting a distance between a lamp body and a power source part.SOLUTION: A lighting device 1 is detachably attached to a duct rail 100 which can be energized. The lighting device 1 includes a lamp body 43, an arm part 42, an attachment 41, a plug 21, a housing 22, a power supply circuit, and a cable 3. The lamp body 43 has a light source. The arm part 42 supports the lamp body 43. The attachment 41 is detachably attached to the duct rail 100. The attachment 41 is connected to the arm part 42. The plug 21 is detachably attached to the duct rail 100. The housing 22 is connected to the plug 21. The power supply circuit is disposed inside the housing 22. A voltage is supplied to the power supply circuit from the duct rail 100 through the plug 21. The cable 3 electrically connects the lamp body 43 with the power supply circuit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device.

  Patent Document 1 discloses a lighting device attached to a duct rail. The illumination device disclosed in Patent Document 1 includes a lamp body (spotlight part), an arm part, and a power supply part. The lamp body is supported by the arm portion. The arm part is connected to the power supply part. The power supply unit includes a housing, a power supply circuit provided in the housing, and a plurality of attachment units. The housing has a substantially rectangular parallelepiped shape. The plurality of attachment portions are disposed on the upper surface of the casing along the longitudinal direction of the casing. The plurality of attachment portions are attached to the duct rail.

JP 2015-18723 A

  However, in the lighting device disclosed in Patent Document 1, the lamp body and the power supply unit are integrated. Therefore, the distance between the lamp body and the power supply unit cannot be adjusted.

  An object of this invention is to provide the illuminating device which can adjust the distance between a lamp main body and a power supply part in view of the said subject.

  The lighting device disclosed in the present application is detachably attached to a duct rail that can be energized. The lighting device includes a lamp body, an arm part, an attachment, a plug, a housing, a power supply circuit, and a cable. The lamp body has a light source. The arm portion supports the lamp body. The attachment is detachably attached to the duct rail. The attachment is connected to the arm portion. The plug is detachably attached to the duct rail. The housing is connected to the plug. The power supply circuit is disposed inside the housing. A voltage is supplied to the power supply circuit from the duct rail through the plug. The cable electrically connects the lamp body and the power supply circuit.

  The lighting device disclosed in the present application may further include a cable housing portion that houses the cable. The cable housing portion may be provided inside the housing.

  In the illumination device disclosed in the present application, the housing may have an opening that allows the outside of the housing to communicate with the cable housing portion.

  The lighting device disclosed in the present application may further include a separating member inside the housing. The separation member may separate a space inside the housing into a first space and a second space. The first space may form the cable housing portion. The power supply circuit may be accommodated in the second space.

  In the lighting device disclosed in the present application, the plug may be pivotably connected to the housing.

  According to the lighting device of the present invention, the distance between the lamp body and the power supply unit can be adjusted.

It is a perspective view which shows the structure of the illuminating device which concerns on embodiment. It is a perspective view which shows the structure of the power supply part which concerns on embodiment. (A) is a figure which shows the 1st attitude | position of the connector part which concerns on this embodiment, (b) is a figure which shows the 2nd attitude | position of the connector part which concerns on this embodiment. It is a rear view which shows the structure of the power supply part which concerns on embodiment. It is a figure which shows the structure inside the housing | casing of the power supply part which concerns on embodiment. It is a side view which shows the structure of the lamp which concerns on embodiment. It is an expansion perspective view which shows the structure of the attachment which concerns on embodiment. It is a figure which shows an example of the state with which the illuminating device shown in FIG. 1 was attached to the duct rail.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, in the drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  First, the configuration of the illumination device 1 will be described with reference to FIG. FIG. 1 is a perspective view showing the configuration of the lighting device 1.

  As shown in FIG. 1, the lighting device 1 is attached to a duct rail 100 that can be energized. Hereinafter, in a state where the lighting device 1 is attached to the duct rail 100, the duct rail 100 side is defined as the upper side of the lighting device 1, and the opposite side of the duct rail 100 is defined as the lower side of the lighting device 1.

  The duct rail 100 includes a rail body 101, two conductor portions 103, and two rail grooves 104.

  The rail main body 101 extends linearly in a direction orthogonal to the up-down direction. The rail body 101 has a slit 102 that extends along the longitudinal direction of the rail body 101. The slit 102 is formed on the lower surface of the rail body 101. The slit 102 communicates with the inside of the rail body 101.

  An AC voltage is supplied to the two conductor portions 103 from an external power source. The two conductor portions 103 are disposed inside the rail body 101. The two conductor portions 103 extend along the longitudinal direction of the rail body 101. The two conductor portions 103 are opposed to each other with the slit 102 interposed therebetween.

  The two rail grooves 104 are formed inside the rail body 101. The two rail grooves 104 extend along the longitudinal direction of the rail body 101. The two rail grooves 104 oppose each other with the slit 102 interposed therebetween. The two rail grooves 104 are respectively located below the two conductor portions 103.

  The lighting device 1 includes a power supply unit 2, a cable 3, and a lamp 4.

  The power supply unit 2 includes a plug 21 and a housing 22. In the present embodiment, for example, metal is used as the material of the housing 22.

  The plug 21 is detachably attached to the duct rail 100. The plug 21 is electrically and mechanically connected to the duct rail 100.

  The housing 22 is connected to the plug 21 so as to be rotatable in the direction indicated by the arrow R1 in FIG. That is, the plug 21 and the housing 22 are rotatable with respect to each other about an axis perpendicular to the lower surface of the rail body 101 as an axis P1.

  The housing 22 has a substantially rectangular parallelepiped shape. The housing 22 has a first side surface 22 a parallel to the longitudinal direction of the housing 22. A first opening 231 is formed at the upper end of the first side surface 22a. The first opening 231 communicates with the inside of the housing 22. The cable 3 is inserted through the first opening 231. In the present embodiment, the first opening 231 is formed continuously from one end to the other end of the first side surface 22a.

  The cable 3 electrically connects the power supply unit 2 and the lamp 4.

  The lamp 4 includes an attachment 41, an arm part 42, and a lamp body 43.

  The attachment 41 is detachably attached to the duct rail 100. In the present embodiment, the attachment 41 is mechanically connected to the duct rail 100.

  The attachment 41 supports the arm portion 42 so as to be rotatable in the direction indicated by the arrow R2 in FIG. That is, the arm part 42 turns around an axis perpendicular to the lower surface of the rail body 101 as the axis P2. The attachment 41 includes an attachment main body 411 and a support portion 41a. The support portion 41 a is disposed on the lower surface of the attachment 41. The support portion 41 a protrudes downward from the lower surface of the attachment 41.

  The arm part 42 includes a base part 421 and two arms 422. The base portion 421 is rotatably supported by the support portion 41a of the attachment 41.

  The two arms 422 extend downward from the base portion 421. The distal end portion 422a of each arm 422 is opposed to the lamp body 43 with the lamp body 43 interposed therebetween. The distal end portion 422a of each arm 422 supports the lamp body 43 so as to be rotatable along a direction indicated by an arrow R3 in FIG. Specifically, the lamp main body 43 rotates around a straight line connecting the distal end portions 422a of the arms 422.

  The lamp body 43 includes a light source therein. The light source is, for example, an LED module in which an LED (Light Emitting Diode) is mounted on a substrate. The light source emits light L when a DC voltage is supplied via the cable 3. The light L is, for example, light at the center of the beam angle among the light emitted from the light source. Hereinafter, the direction in which the light L is emitted may be referred to as an “emission direction”. The emission direction can be adjusted by turning the arm portion 42 along the direction indicated by the arrow R2. Further, the emission direction can be adjusted by rotating the lamp body 43 along the direction indicated by the arrow R3. The lamp body 43 is connected to the cable 3 on the side opposite to the light L emission direction.

  Next, the configuration of the power supply unit 2 will be described with reference to FIGS. FIG. 2 is a perspective view showing the configuration of the power supply unit 2. Specifically, FIG. 2 shows the power supply unit 2 in which the end portion on the lamp 4 side of the housing 22 shown in FIG. 1 is turned 90 degrees in the direction indicated by the arrow R1 shown in FIGS.

  As shown in FIG. 2, the plug 21 includes a plug main body 211, a protruding portion 212, a guide portion 213, a connector portion 214, and a lever 218.

  The plug body 211 has a substantially cylindrical shape. A protrusion 212 is provided on the outer peripheral surface of the plug body 211.

  The protrusion 212 protrudes outward in the radial direction of the plug body 211. In FIG. 2, the direction in which the protruding portion 212 protrudes is described as the front side of the power supply unit 2, and the side opposite to the front side is described as the rear side of the power supply unit 2. The outer shape of the front edge of the protrusion 212 when viewed from above is substantially semicircular.

  The guide part 213 is provided on the upper surface of the plug body 211. The guide part 213 has a substantially rectangular parallelepiped shape. The guide portion 213 is inserted into the slit 102 in a posture in which the longitudinal direction thereof coincides with the longitudinal direction of the slit 102 described with reference to FIG.

  The connector part 214 is provided on the upper surface of the protruding part 212. The connector 214 is rotatable in a direction indicated by an arrow R4 in FIG. 2 with an axis perpendicular to the upper surface of the protrusion 212 as an axis P4. The connector part 214 includes a connector body 215, two terminals 216 (two electrodes), and two connector support parts 217.

  The connector body 215 is connected to the upper surface of the protrusion 212. The connector main body 215 has a substantially cylindrical shape.

  Two terminals 216 are provided on the outer peripheral surface of the connector main body 215 so as to face each other with the axis P4 interposed therebetween. The two terminals 216 protrude outward in the radial direction of the connector main body 215, respectively.

  Two connector support portions 217 are provided below the outer peripheral surface of the connector main body 215 so as to face each other with the axis P4 interposed therebetween. The two connector support portions 217 protrude in the same direction as the direction in which the two terminals 216 protrude. Each connector support portion 217 protrudes outward from the terminal 216 protruding in the same direction.

  The lever 218 is provided on the outer peripheral surface of the protrusion 212. The lever 218 is slidable along the outer peripheral surface of the protrusion 212. As the lever 218 slides, the connector 214 rotates about the axis P4. In the present embodiment, the lever 218 is slidable between the first position S1 and the second position S2.

  Next, a method for attaching the plug 21 to the duct rail 100 will be described with reference to FIGS. 1, 3A, and 3B.

  FIG. 3A is a view showing a first posture of the connector portion 214. Specifically, FIG. 3A is a diagram of the power supply unit 2 viewed from above when the lever 218 is at the first position S1. In FIG. 3A, the protruding directions of the two terminals 216 and the two connector support portions 217 coincide with the short direction of the guide portion 213. FIG. 3B is a diagram showing the second posture of the connector part 214. Specifically, it is a view of the power supply unit 2 as viewed from above when the lever 218 is at the second position S2. In FIG. 3B, the protruding directions of the two terminals 216 and the two connector support portions 217 coincide with the longitudinal direction of the guide portion 213. That is, the second posture is a posture in which the connector portion 214 is rotated 90 degrees from the first posture with the axis P4 as an axis. When the lever 218 slides from the first position S1 shown in FIG. 3 (a) to the second position S2 shown in FIG. 3 (b), the connector 214 is viewed from the first posture shown in FIG. 3 (a). It changes to the 2nd attitude | position shown to 3 (b).

  When attaching the plug 21 to the duct rail 100 shown in FIG. 1, first, as shown in FIG. 3B, the lever 218 is moved to the second position S <b> 2 to bring the connector 214 into the second posture. Thereby, the protruding directions of the two terminals 216 and the two connector support portions 217 coincide with the longitudinal direction of the guide portion 213. Next, the connector portion 214 is inserted into the slit 102 in such a posture that the protruding direction of the two terminals 216, the protruding direction of the two connector support portions 217, and the longitudinal direction of the guide portion 213 coincide with the longitudinal direction of the slit 102. Next, the lever 218 is slid from the second position S2 to the first position S1 as shown in FIG. Thereby, the connector part 214 will be in a 1st attitude | position. As a result, the two connector support portions 217 are fitted into the two rail grooves 104, respectively, and the two terminals 216 are in contact with the two conductor portions 103, respectively. The plug 21 is mechanically connected to the duct rail 100 by fitting the two connector support portions 217 into the two rail grooves 104, respectively. Further, the plugs 21 are electrically connected to the duct rail 100 by the two terminals 216 contacting the two conductor portions 103 respectively. As a result, the AC voltage from the outside is supplied to the power supply unit 2.

  Next, with reference to FIG. 4, the structure of the housing | casing 22 of the power supply part 2 is demonstrated in detail. FIG. 4 is a rear view showing the configuration of the power supply unit 2.

  As shown in FIG. 4, the housing 22 has a second side surface 22b. The second side surface 22b faces the first side surface 22a described with reference to FIG. A second opening 232 is formed at the upper end of the second side surface 22b. The second opening 232 communicates with the inside of the housing 22. Similarly to the first opening 231, the second opening 232 is formed continuously from one end to the other end of the second side surface 22b. The cable 3 may be inserted through the second opening 232.

  Next, the internal configuration of the housing 22 of the power supply unit 2 will be described with reference to FIG. FIG. 5 is a diagram illustrating an internal configuration of the housing 22 of the power supply unit 2. Specifically, FIG. 5 is a view of the inside of the housing 22 shown in FIG. 2 as viewed from the front side.

  As shown in FIG. 5, the power supply unit 2 further includes a separation member 24 and a power supply circuit 25. The separation member 24 and the power supply circuit 25 are disposed inside the housing 22.

  The separation member 24 separates the internal space 220 of the housing 22. Specifically, the separation member 24 separates the internal space 220 into a first space 221 and a second space 222. The first space 221 is located above the second space 222. In the present embodiment, for example, a metal is used as the material of the separation member 24.

  The cable 3 is accommodated in the first space 221. In the present embodiment, the first space 221 forms a cable housing portion. The first space 221 communicates with the second opening 232. The first space 221 communicates with the first opening 231 described with reference to FIG. The cable 3 can be taken in and out of the first space 221 through the first opening 231. For example, when the distance between the power supply unit 2 and the lamp 4 is shorter than the total length of the cable 3, the cable 3 hangs between the power supply unit 2 and the lamp 4. The first space 221 can accommodate a portion (excess portion) where the cable 3 hangs down.

  The power supply circuit 25 is accommodated in the second space 222. The power supply circuit 25 is electrically connected to the two terminals 216 of the connector part 214. When the two terminals 216 come into contact with the two conductor portions 103 of the duct rail 100, an AC voltage is supplied to the power supply circuit 25. The power supply circuit 25 generates a DC voltage based on the AC voltage.

  The power supply circuit 25 is connected to the cable 3. The power supply circuit 25 supplies the generated DC voltage to the lamp 4 via the cable 3.

  Next, the configuration of the lamp 4 will be described with reference to FIGS. 6 and 7. FIG. 6 is a side view showing the configuration of the lamp 4. FIG. 7 is an enlarged perspective view showing the configuration of the attachment 41. Specifically, FIG. 7 is a view of the attachment 41 as viewed from obliquely above.

  As shown in FIG. 6, the lamp body 43 is rotatable with the tip end portion 422 a of the arm portion 42 as a fulcrum.

  In the present embodiment, the two arms 422 are inclined by, for example, 45 degrees with respect to the axis P2. Thereby, when rotating the lamp main body 43 along the direction shown by the arrow R <b> 3 in FIG. 1, the lamp main body 43 can be prevented from coming into contact with the attachment 41.

  As shown in FIG. 6, the attachment 41 further includes an attachment support portion 412 in addition to the attachment main body 411. The attachment main body 411 is substantially cylindrical. The attachment support part 412 is provided on the upper surface of the attachment main body 411.

  As shown in FIG. 7, the attachment support portion 412 has a brim portion 413. The brim portion 413 is substantially rectangular. The collar part 413 has two fitting parts 413a. The two fitting portions 413a are fitted into the rail grooves 104 described with reference to FIG.

  Then, with reference to FIG.1 and FIG.7, the attachment method to the duct rail 100 of the attachment 41 is demonstrated.

  When attaching the attachment 41 to the duct rail 100 shown in FIG. 1, first, the attachment 41 is inserted into the slit 102 in a posture in which the longitudinal direction of the brim portion 413 and the longitudinal direction of the slit 102 coincide. Next, the attachment 41 inserted into the slit 102 is rotated 90 degrees with respect to the duct rail 100. Accordingly, the two fitting portions 413a are fitted into the two rail grooves 104. As a result, the attachment 41 is mechanically connected to the duct rail 100.

  The embodiments of the present invention have been described above with reference to the drawings. According to the present embodiment, the cable 3 electrically connects the power supply unit 2 and the lamp 4. For this reason, the distance between the power supply part 2 and the lamp 4 can be adjusted. Therefore, the freedom degree of arrangement | positioning of the lamp 4 can be improved. Moreover, the power supply part 2 and the lamp 4 can be arrange | positioned in the position which left | separated. This reduces the occurrence of thermal interference between the power supply unit 2 and the lamp 4 (lamp body 43) (the heat of the power supply unit 2 is transmitted to the lamp 4 and the heat of the lamp 4 is transmitted to the power supply unit 2). can do.

  Moreover, according to this embodiment, the power supply part 2 can be arrange | positioned in the position away from the lamp 4. FIG. For this reason, for example, as shown in FIG. 8, when three lamps 4 are arranged on the duct rail 100, the three lamps 4 can be arranged close to each other. In addition, the number of the lamps 4 which can be arrange | positioned adjacently is not limited to three units. For example, two or four or more lamps 4 can be arranged close to each other. Therefore, the freedom degree of arrangement | positioning of the lamp 4 can be improved.

  Further, according to the present embodiment, the housing 22 is pivotally connected to the plug 21. Therefore, the housing 22 can freely change the posture with respect to the duct rail 100. That is, the housing 22 is attached to the duct rail 100 in a posture in which the longitudinal direction of the housing 22 is orthogonal to the longitudinal direction of the duct rail 100. As a result, the occupied area in which the power supply unit 2 occupies the duct rail 100 is reduced. Therefore, the freedom degree of arrangement | positioning of the lamp 4 to the duct rail 100 can be improved. The occupied area indicates an area of a region where the duct rail 100 and the housing 22 overlap when viewed in a plan view. Further, since the area occupied by the power supply unit 2 in the duct rail 100 is reduced, the number of lamps 4 that can be arranged on the duct rail 100 can be increased.

  Moreover, when the distance between the position where the power supply unit 2 is arranged and the position where the lamp 4 is arranged is shorter than the total length of the cable 3, the cable 3 may hang down between the power supply unit 2 and the lamp 4. There is. In this case, the light L emitted from the lamp 4 may be blocked by the cable 3 that hangs down. That is, there is a possibility that a shadow may be generated due to the cable 3 hanging down. However, according to the present embodiment, the excess portion of the cable 3 can be accommodated in the housing 22 via the first opening 231. Thereby, the length of the surplus part of the cable 3 can be adjusted. Therefore, the generation of shadows can be suppressed.

  Further, according to the present embodiment, the internal space 220 of the housing 22 is separated into the first space 221 and the second space 222 by the separation member 24. The cable 3 is accommodated in the first space 221. The power supply circuit 25 is accommodated in the second space 222. Therefore, it is possible to prevent heat from being transmitted to the cable 3 due to the power supply circuit 25 coming into contact with the cable 3.

  In the present embodiment, metal is used as the material for the housing 22 and the separation member 24. In general, the specific heat of a metal is smaller than that of a resin or the like. Therefore, the heat dissipation of the housing 22 and the separating member 24 is enhanced. As a result, the housing 22 and the separating member 24 can easily dissipate heat from the power supply circuit 25.

  In general, warm air rises. According to this embodiment, the 1st opening 231 is formed in the upper end part (attachment 41 side) of the 1st side 22a which the housing | casing 22 has. The second opening 232 is formed at the upper end portion of the second side surface 22 b of the housing 22. Therefore, the air heated by the heat from the power supply circuit 25 is easily discharged to the outside of the housing 22 through the first opening 231 and the second opening 232.

  Moreover, according to this embodiment, the 1st opening 231 and the 2nd opening 232 are each provided in the 1st side 22a and the 2nd side 22b which oppose. For this reason, convection is likely to occur inside the housing 22. As a result, the air heated by the heat from the power supply circuit 25 can be efficiently discharged to the outside of the housing 22.

  In addition, this invention is not restricted to said embodiment, It is possible to implement in a various aspect in the range which does not deviate from the summary.

  For example, in the embodiment of the present invention, the configuration in which the two arms 422 support the lamp body 43 has been described, but the present invention is not limited to this. For example, the lamp body 43 can be supported by one or three or more arms.

  Further, in the embodiment of the present invention, the case where two openings (the first opening 231 and the second opening 232) are formed in the housing 22 has been described as an example, but the number of openings formed in the housing 22 is as follows. It is not limited to two. For example, the number of openings formed in the housing 22 may be one or three or more.

  In the embodiment of the present invention, the configuration in which the opening (first opening 231) is continuously formed from one end to the other end of the first side surface 22a has been described, but the present invention is not limited to this. For example, a plurality of openings may be intermittently formed from one end to the other end of the first side surface 22a. Similarly, a plurality of openings may be intermittently formed from one end to the other end of the second side surface 22b.

  In the embodiment of the present invention, the first opening 231 and the second opening 232 are formed on the side surfaces (the first side surface 22 a and the second side surface 22 b) parallel to the longitudinal direction of the housing 22. The side surface on which 231 and the second opening 232 are formed is not limited to the side surface parallel to the longitudinal direction of the housing 22. For example, the first opening 231 and the second opening 232 may be formed on the side surface of the housing 22 parallel to the short direction.

  In the embodiment of the present invention, the configuration in which the opening is formed on the side surface of the housing 22 has been described as an example. However, the present invention is not limited to this. For example, an opening may be formed on the upper surface or the bottom surface of the housing 22.

  In the embodiment of the present invention, the length in the longitudinal direction and the length in the short direction of the first opening 231 may be any length that allows the cable 3 to be inserted. The length in the longitudinal direction and the length in the short direction of the first opening 231 are more preferably larger than the outer diameter of the cable 3. Thereby, the cable 3 can be taken in and out of the first space 221 through the first opening 231 more smoothly. In addition, since the length in the longitudinal direction and the length in the short direction of the first opening 231 are larger than the outer diameter of the cable 3, the cable 3 is prevented from being rubbed in contact with the edge of the first opening 231. Can do. As a result, damage to the covering material covering the conductor of the cable 3 can be suppressed.

  In the embodiment of the present invention, the configuration in which the first space 221 and the second space 222 are arranged in the vertical direction has been described as an example, but the present invention is not limited to this. For example, the first space 221 and the second space 222 may be arranged in a direction perpendicular to the vertical direction. In this case, the housing 22 may have an opening communicating with the first space 221.

  In the embodiment of the present invention, the case where the first space 221 is located above the second space 222 has been described as an example, but the present invention is not limited to this. For example, the first space 221 may be located below the second space 222. Thereby, the full length of the cable which connects the power supply circuit 25 and the plug 21 can be shortened. As a result, the product cost of the lighting device 1 can be reduced.

  In the embodiment of the present invention, the housing 22 includes one separation member 24, but the present invention is not limited to this, and the housing 22 may include two or more separation members 24.

  In the embodiment of the present invention, the configuration in which one lamp 4 and one power supply unit 2 are connected has been described as an example, but the present invention is not limited to this. For example, two or more lamps 4 may be connected to one power supply unit 2. Specifically, two or more lamp main bodies 43 may be connected to the power supply circuit 25 in parallel, or two or more lamp main bodies 43 may be connected to the power supply circuit 25 in series.

  In the embodiment of the present invention, the case where the power supply circuit 25 converts an AC voltage into a DC voltage has been described as an example, but the present invention is not limited to this. For example, the power supply circuit 25 may convert the voltage value of the AC voltage.

  Moreover, in embodiment of this invention, although the alternating voltage was supplied to the duct rail 100, this invention is not limited to this. For example, a DC voltage can be supplied to the duct rail 100. In this case, the power supply circuit 25 may convert the voltage value of the DC voltage supplied from the duct rail 100.

DESCRIPTION OF SYMBOLS 1 Illuminating device 3 Cable 21 Plug 22 Case 24 Separation member 25 Power supply circuit 41 Attachment 42 Arm part 43 Lamp main body 100 Duct rail 221 1st space (cable accommodation space)
222 2nd space 231 1st opening 232 2nd opening

Claims (5)

A lighting device that is detachably attached to a duct rail that can be energized,
A lamp body having a light source;
An arm portion for supporting the lamp body;
An attachment that is detachably attached to the duct rail and connected to the arm portion;
A plug detachably attached to the duct rail;
A housing connected to the plug;
A power supply circuit that is arranged inside the housing and is supplied with voltage from the duct rail via the plug;
A lighting device comprising: a cable that electrically connects the lamp body and the power supply circuit.
A cable housing portion for housing the cable;
The lighting device according to claim 1, wherein the cable housing portion is provided inside the housing.
The lighting device according to claim 2, wherein the housing has an opening that allows communication between the outside of the housing and the cable housing portion.
Further comprising a separating member inside the housing,
The separating member separates the space inside the housing into a first space and a second space,
The first space forms the cable housing portion,
The lighting device according to claim 2 or 3, wherein the power supply circuit is accommodated in the second space.
  The lighting device according to claim 1, wherein the plug is pivotally connected to the housing.

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