Luminaire

Abstract

To provide a luminaire comprising a circuit cover capable of being easily arranged at an appropriate position in an appliance body.SOLUTION: A luminaire 11 comprises: a main part 22; and an appliance body 21 having a bottomed cylindrical shape comprising a side wall part 27 surrounding the main part 22, and housing a light source part 41, and a power supply part 31 for supplying power to the light source part 41. The appliance body 21 is formed so as to comprise a light source attachment part 23 provided at the center of the main part 22, and a power supply attachment part 29 arranged around the light source attachment part 23. The power supply part 31 comprises a power supply circuit part 32, and an annular circuit cover 33a housing the power supply circuit part 32. The circuit cover 33a has a shape capable of being placed on the power supply attachment part 29 along an inner peripheral surface of the side wall part 27 of the appliance body 21.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a lighting fixture. [Background technology]

[0002] A small, thin lighting fixture described in Patent Document 1, which is a ceiling-mounted lighting fixture that is directly attached to a mounting surface such as a ceiling, has been known for some time. Patent Document 1 discloses a lighting fixture that includes a metal housing, a light source provided on the front side of the housing, a power supply circuit board that supplies power to the light source, and an insulating case that houses the power supply circuit board and is disposed on the back side of the housing. In the lighting fixture of Patent Document 1, the semi-annular case is provided with mounting portions that are fastened with screws to multiple bosses provided on the back side of the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-135066 Summary of the Invention [Problem to be solved by the invention]

[0004] In the lighting fixture of Patent Document 1, the mounting part of the case had to be positioned so as to overlap with the boss inside the housing, and multiple screws had to be used to fasten the case at the position where the mounting part of the case and the boss inside the housing overlap. Therefore, in the positioning process, the worker had to tighten the screws while aligning the mounting part of the case with the boss inside the housing, which made the work complicated.

[0005] Therefore, the present invention has been made in consideration of the above problems, and has an object to provide a lighting fixture having a circuit cover that can be easily placed in an appropriate position within the housing. [Means for solving the problem]

[0006] The problem to be solved by the present invention is as described above, and the means for solving this problem will now be described.

[0007] That is, the lighting fixture disclosed in the present application has: A lighting fixture comprising a fixture body having a bottomed cylindrical shape with a main portion and a side wall portion surrounding the main portion, the fixture body housing a light source portion and a power supply portion that supplies power to the light source portion, The fixture body is formed to have a light source mounting portion provided at the center of the main portion and a power supply mounting portion arranged around the light source mounting portion, the power supply unit has a power supply circuit unit and an annular circuit cover that houses the power supply circuit unit, The circuit cover has a shape that allows it to be placed on the power supply mounting portion along the inner circumferential surface of the side wall of the device body.

[0008] In the lighting fixture disclosed in the present application, It is preferable that the circuit cover is formed in a U-shape in cross section to form a recess, and the power supply circuit section is disposed in the recess.

[0009] In the lighting fixture disclosed in the present application, The circuit cover preferably includes a first area in which the power supply circuit section is disposed, and a second area continuous with the first area.

[0010] In the lighting fixture disclosed in the present application, It is preferable that the circuit cover has a top panel portion that covers the top surface of the first region. [Effects of the Invention]

[0011] According to the present invention, by configuring the circuit cover in an annular shape and placing the circuit cover on the power supply mounting portion along the inner surface of the side wall of the fixture body, the circuit cover can be easily positioned on the power supply mounting portion. [Brief explanation of the drawings]

[0012] [Figure 1]1 is a perspective view showing a lighting fixture according to an embodiment of the present invention; [Figure 2] FIG. [Figure 3] FIG. 10 is a bottom view showing the lighting fixture with the cover removed. [Figure 4] FIG. 10 is a plan view showing the mounting surface side of the lighting fixture with the rear cover removed. [Figure 5] FIG. 2 is a cross-sectional view taken along line AA showing the lighting fixture attached to the mounting portion. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 4 is an exploded perspective view showing the configuration of the circuit cover and the fixture body. [Figure 9] FIG. 4 is an exploded top perspective view showing the configuration of the circuit cover and the fixture body. DETAILED DESCRIPTION OF THE INVENTION

[0013] A lighting fixture 11 according to one embodiment of the present invention will be described with reference to FIGS. 1 to 9. The lighting fixture 11 according to this embodiment is a lighting fixture that uses an LED element 42 as a light source. The lighting fixture 11 can be used as a direct-mount ceiling light that is directly attached to a mounting surface such as a ceiling. The lighting fixture 11 can also be attached to a wall surface (including an inclined surface) and used as a bracket light. In the following description, the side of the lighting fixture 11 that emits light is referred to as the irradiation surface side of the lighting fixture 11, and the side of the lighting fixture 11 that faces the mounting surface such as a ceiling is referred to as the mounting surface side (opposite to the irradiation surface side) of the lighting fixture 11. The mounting surface side of the lighting fixture 11 is the back side (rear side) of the fixture body 21. In addition, when the lighting fixture 11 shown in FIG. 5 is attached to the mounting base C, the direction perpendicular to the mounting base C is referred to as the up-down direction of the lighting fixture 11, with the mounting surface side of the lighting fixture 11 being referred to as the upside and the direction directly below the irradiation surface side of the lighting fixture 11 being referred to as the downside. The direction perpendicular to the vertical direction of the lighting fixture 11 will be described as the side of the lighting fixture 11. In the following description, the state in which the lighting fixture 11 etc. is viewed from below will be referred to as a plan view. The state in which the lighting fixture 11 etc. is viewed from a direction perpendicular to the vertical direction will be referred to as a side view. The state in which the cross-sectional shape of the lighting fixture 11 etc. is viewed will be referred to as a cross-sectional view.

[0014] 1 to 9, lighting fixture 11 mainly includes fixture body 21, power supply unit 31, light source unit (LED module board) 41, diffuser plate 51, cover unit 61, rear cover unit 71, and connection unit 81. The external shape of lighting fixture 11 is approximately circular in plan view, and has a thin, flat, approximately cylindrical shape in which the dimension in the height direction of lighting fixture 11 (the vertical direction of lighting fixture 11 in FIG. 2) is smaller than the dimension in the radial direction of lighting fixture 11 (the direction perpendicular to the vertical direction of lighting fixture 11 in FIG. 2). The external shape of lighting fixture 11 is not limited to that of the present embodiment. In plan view, it may be an ellipse, a square, a rectangle, a polygon, a sector, or a combination thereof, in addition to a substantially circular shape. Furthermore, the mounting portion C on which the lighting fixture 11 is mounted is provided with a through-hole H that is circular in plan view. The through-hole H is a hole for inserting electric wires such as a power supply wire for connecting to an external commercial power source and an electric wire for feeding wiring.

[0015] The fixture body 21 is a flat, dish-shaped member that is approximately circular in plan view. The fixture body 21 holds the power supply unit 31, the light source unit 41, the diffuser plate 51, the cover unit 61, the rear cover unit 71, the connection unit 81, and the like. Specifically, the fixture body 21 is a member that houses the power supply unit 31 in a power supply mounting unit 29 (described later) on the mounting surface side, and to which the connection unit 81 and the rear cover unit 71 are attached on the mounting surface side, and to which the light source unit 41, the diffuser plate 51, and the cover unit 61 are attached on the irradiation surface side. The light source unit 41 is housed on the irradiation surface side of the fixture body 21. Examples of materials that constitute the fixture body 21 include metal materials with high thermal conductivity, such as aluminum and aluminum alloys. The fixture body 21 also has a heat dissipation function that transfers heat generated by the light source unit 41 and releases it to the outside. The fixture body 21 is formed using a metal material such as aluminum, taking into consideration the mechanical properties that enable it to hold the power supply unit 31, light source unit 41, diffuser plate 51, cover unit 61, rear cover unit 71, and connection unit 81, as well as the thermal conductivity that allows it to dissipate heat generated by the light source unit 41. The fixture body 21 is formed so that its outer shape in a plan view is approximately the same as or slightly smaller than the inner shape of the cover unit 61. The device body 21 is not limited to metals such as aluminum, and may be made of other materials such as resin, or a combination thereof, as long as the material has the necessary mechanical properties and thermal conductivity.

[0016] The fixture body 21 mainly has a main portion 22 (protrusion 22a, light source mounting portion 23, reflecting portion 24, locking step portion 25, terminal mounting portion 30), an outer peripheral edge portion 26, a side wall portion 27, a fixing member arrangement portion 28, and a power supply mounting portion 29. The fixture body 21 is a member that is directly attached to a mounting portion C with fixing members 91 such as screws.

[0017] The main portion 22 is a dish-shaped portion that is generally circular in plan view and has an outer shape that is concave toward the mounting surface. The main portion 22 has a convex portion 22a that is circular in plan view and protrudes toward the irradiation surface at its radial center, a light source mounting portion 23 that is generally annular in plan view and is arranged around the convex portion 22a, a reflecting portion 24 formed around the light source mounting portion 23, and a locking step portion 25 formed around the reflecting portion 24. A terminal mounting portion 30 for mounting a connecting portion 81 is formed in the center of the light source mounting portion 23 on the mounting surface side. In addition, the central portion of the instrument body 21 in this embodiment is formed concavely toward the mounting surface side, and by forming the instrument body 21 in this manner, the mechanical strength and rigidity of the instrument body 21 can be increased. In addition, in this embodiment, the shape of the device body 21 is formed such that the central portion of the device body 21 is concave toward the mounting surface side (upward in FIG. 2), but the shape is not particularly limited to this.

[0018] The light source mounting portion 23 is a recessed portion to which the light source unit (LED module substrate) 41 is positioned and mounted at a predetermined position. The light source mounting portion 23 has a mounting surface 23a, which is a flat plate portion having a substantially circular ring shape in plan view and extends radially outward from the outer periphery of the protruding portion 22a, and a stepped portion 23b formed along the outer periphery of the mounting surface 23a. The mounting surface 23a is located approximately in the center of the fixture body 21 in the up-down direction. The protruding portion 22a of the fixture body 21 engages with the opening 43a of the substrate 43 of the light source unit 41, and the outer periphery of the substrate 43 is engaged with the stepped portion 23b, thereby positioning the substrate 43 relative to the light source mounting portion 23. The substrate 43 of the light source unit 41 is mounted in contact with the mounting surface 23a of the light source mounting portion 23. In order to facilitate the transfer of heat generated in the light source unit 41 and its release to the outside, the mounting surface 23a of the light source mounting unit 23 to which the light source unit 41 abuts is formed flat to increase the contact area with the light source unit 41. In this embodiment, the planar shape of the mounting surface 23a of the light source mounting portion 23 is approximately circular, but this is not particularly limited, and it may be any shape other than circular as long as at least a portion of the substrate 43 can be mounted.

[0019] The reflecting portion 24 is a portion that reflects light emitted from the LED elements 42 and light reflected by the inner wall surface of the diffuser plate 51 and emits the light toward the irradiation surface. The reflecting portion 24 is an inclined portion that extends from the stepped portion 23b of the light source mounting portion 23 and has an annular shape in a plan view and increases in diameter downward. A locking step 25 is provided around the periphery of the reflecting portion 24 to lock and position the diffuser plate 51.

[0020] 5, the locking step 25 is an annular portion to which the outer peripheral edge of the diffuser plate 51 is locked. The locking step 25 has a pair of screw mounting portions 25a that extend radially outward from the locking step 25 and are used to mount the diffuser plate 51 with mounting members such as screws. The screw mounting portions 25a are recessed regions that protrude radially outward from the outer peripheral edge of the locking step 25, and are portions at which the mounting portions 51a of the diffuser plate 51 are locked and positioned. The screw mounting portions 25a are disposed facing the radially outer side of the reflecting portion 24. In this embodiment, the screw mounting portion 25a is provided so that the diffusion plate 51 can be mounted using a mounting member such as a screw, but if a mounting method such as adhesion or fitting is used, it is not necessary to provide the screw mounting portion 25a.

[0021] 4, the terminal mounting portion 30 has, on the mounting surface side of the light source mounting portion 23, a pair of semicircular mounting surface portions 30a arranged opposite the radial center of the fixture body 21 in a plan view, and a pair of locking portions 30b formed in a semicircular arc convex shape on the outer periphery of the mounting surface portions 30a. The mounting surface portions 30a are portions to which the fixing portion 84 of the connection portion 81 is attached by a screw member. The locking portions 30b are portions to which the fixing portion 84 of the connection portion 81 is locked and positioned.

[0022] The outer peripheral edge portion 26 is a substantially annular portion having a predetermined width in a plan view, which extends radially outward from the outer peripheral edge portion of the locking step portion 25. The outer peripheral edge portion 26 is disposed radially outward from the light source mounting portion 23, and is positioned lower than the light source mounting portion 23 in the up-down direction.

[0023] The side wall portion 27 is a portion provided to surround the main portion 22 and is a substantially cylindrical portion extending upward from the outer periphery of the outer periphery portion 26. The side wall portion 27 has multiple cover attachment portions 27a and a pair of fixing member placement portions 28. The cover attachment portions 27a are provided on the outer periphery of the side wall portion 27 and are portions for attaching and engaging the locking end portion of the cover portion 61. The fixing member placement portions 28 are portions formed by drilling the outer periphery portion 26 and the side wall portion 27 radially inward, and are composed of a wall portion 28a that is substantially V-shaped in plan view and a flat instrument attachment portion 28b that is substantially triangular in plan view and extends radially outward from the upper end of the wall portion 28a. The instrument attachment portion 28b has a through hole formed therein for attaching the instrument body 21 to the attachment portion C with a fixing member (not shown) such as a screw. In this way, in the fixture body 21 , the fixing member placement portion 28 , which is the fixing position by the fixing member, is configured to be on the outer periphery side of the light source portion 41 and not overlap with the power source portion 31 .

[0024] The power supply mounting portion 29 is arranged around the mounting surface side of the light source mounting portion 23, and is a space formed to accommodate the power supply unit 31 and other components and position them in a predetermined position, with the height and width sufficient to accommodate the power supply unit 31 and other components. Specifically, the power supply mounting portion 29 is a substantially annular space having a predetermined width, formed between the outer circumferential edge of the reflecting portion 24 and the inner circumferential surface of the side wall portion 27 in a plan view. As will be described in detail later, the power supply mounting portion 29 is capable of accommodating the power supply unit 31 and positioning it in a predetermined position.

[0025] The power supply unit 31 is a power supply device that supplies power to the LED elements 42 included in the light source unit 41 to light up the LED elements 42. The power supply unit 31 converts AC current supplied from an external commercial power source into a predetermined DC current and supplies the converted current to the multiple LED elements 42 mounted on the substrate 43. The power supply unit 31 is arranged on a side (back side) of the fixture body 21 that is different from the side (illumination side) on which the light source unit 41 is arranged. The power supply unit 31 has a power supply circuit unit 32 and a power supply case 33 that houses the power supply circuit unit 32. The power supply circuit unit 32 is formed by mounting multiple electronic components on a printed wiring board that is processed into a semicircular arc shape having a predetermined width.

[0026] The power supply case 33 covers and protects the periphery of the power circuit unit 32. As shown in FIGS. 4 and 5 , when the power supply case 33 is accommodated in the power supply mounting portion 29, the radially inner lower end of the power supply case 33 is positioned by the locking step portion 25, and the radially outer end of the power supply case 33 is positioned by the side wall portion 27 and the fixing member mounting portion 28. This allows the power supply case 33 to be easily positioned in the power supply mounting portion 29 of the fixture body 21. The outer side surface of the power supply case 33 is shaped to fit along the inner surface of the side wall portion 27 of the fixture body 21, thereby preventing misalignment and rattle. In addition, in this embodiment, a portion of the radially inner end of the power supply case 33 is shaped to fit along one of the mounting portions 34, preventing the power supply case 33 from being mounted 180° incorrectly to the fixture body 21. This allows the power supply case 33 to be easily positioned in the appropriate position on the fixture body 21.

[0027] The power supply case 33 is formed in a generally annular shape having a predetermined width in a plan view. The power supply case 33 has a circuit cover 33a that is annular with a bottom and open at the top, and a top plate portion 33b that covers the upper end of the circuit cover 33a. The circuit cover 33a has a generally annular bottom surface having a predetermined width in a plan view, and outer and inner peripheral walls protrude upward from the inner and outer peripheral edges of the bottom surface. Therefore, the bottom surface, outer peripheral wall, and inner peripheral wall form an internal space that is generally rectangular in cross section and open at the top.

[0028] Furthermore, the outer peripheral wall of the circuit cover 33a is formed along the inner peripheral surface of the side wall portion 27. A portion of the outer peripheral wall of the circuit cover 33a is formed along the inner peripheral surface of the V-shaped wall portion 28a of the fixing member arrangement portion 28. In other words, a portion of the outer peripheral wall of the circuit cover 33a is formed to be V-shaped concave toward the center in the radial direction. In this embodiment, the concave portions are formed at two locations every 180° in accordance with the arrangement of the fixing member arrangement portion 28.

[0029] Furthermore, a protrusion 33c is provided on the mounting surface side in the V-shaped curved portion. The protrusion 33c is formed to protrude along the screw mounting portion 25a protruding toward the mounting surface side to a position lower than the outer peripheral wall of the circuit cover 33a. In this embodiment, the protrusion 33c divides the space inside the circuit cover 33a into a first region S1 and a continuous second region S2.

[0030] The top panel 33b covers the upper end of the first area S1 of the circuit cover 33a and is formed in a generally arc-like shape with a predetermined width in a plan view. The top panel 33b is provided only in the first area S1, which is the area that houses the power supply circuit unit 32. This reduces the number of parts while preventing dust from entering the first area S1 where the power supply circuit unit 32 is located. The top panel 33b also prevents the power supply circuit unit 32 from coming into contact with the rear cover 71.

[0031] Additionally, multiple heat dissipation pads 33d are provided on the surface of top panel 33b facing power supply circuit unit 32. Heat dissipation pads 33d are plate-shaped members with heat dissipation properties, and are formed, for example, from flame-retardant silicone resin. Furthermore, heat dissipation pads 33d are insulating. Heat dissipation pads 33d are positioned opposite heat-generating components, such as capacitors, that would occur when power supply circuit unit 32 is placed in first region S1, and efficiently dissipate heat generated from those components to the outside. Furthermore, heat dissipation pads 33d are elastic, absorbing external vibrations and the like that lighting fixture 11 receives, thereby suppressing rattling of power supply circuit unit 32.

[0032] The power supply circuit unit 32 is housed in the first area S1 of the circuit cover 33a. The power supply circuit unit 32 is positioned in the first area S1 within the circuit cover 33a by the protrusion 33c. By housing the power supply circuit unit 32 in the circuit cover 33a to form a single unit, they can be easily placed in the fixture body 21 at the same time, improving the ease of assembly of the lighting fixture 11. In other words, this simplifies the assembly work of the lighting fixture 11. It becomes possible to separate the work of housing the power supply circuit unit 32 in the circuit cover 33a to form a single unit from the work process of attaching the single unit to the fixture body 21, thereby improving productivity.

[0033] The circuit cover 33a is annular and has a first region S1 housing the power supply circuit unit 32 and a second region S2 spatially connected to the first region S1. This facilitates air movement from the first region S1 to the second region S2. Air heated by heat generated by the power supply circuit unit 32 in the first region S1 can easily convect to the second region S2. In other words, some of the heat generated by the power supply circuit unit 32 housed in the first region S1 of the circuit cover 33a is transferred to the air in the first region S1. If the temperature of the second region S2 is lower than that of the first region S1, some of the air in the first region S1 convects from the space above the protrusion 33c into the second region S2. Some of the heat transferred from the power supply circuit unit 32 to the air in the first region S1 and the second region S2 is further transferred to the power supply case 33, the fixture body 21, and the rear cover 71, and then dissipated into the air surrounding the lighting fixture 11. This allows the heat generated from the power supply circuit section 32 to be efficiently dissipated on the second region S2 side as well, thereby improving the heat dissipation efficiency compared to, for example, using a circuit cover that does not have an arc-shaped second region S2.

[0034] In this embodiment, no components are arranged in the second area S2, but it is also possible to arrange, for example, sensor components, wireless communication devices, switch components, etc. By storing these components in the power supply case 33, they can be integrated into a single unit together with the power supply circuit section 32 and the power supply case 33.

[0035] Then, by attaching the rear cover part 71 to the mounting surface side of the lighting fixture 11, the power supply unit 31 (power supply case 33) is placed inside the fixture body 21 with the lower surface of the rear cover part 71 abutting against the upper end of the power supply case 33. In this way, the power supply unit 31 can be placed on the power supply mounting part 29 of the fixture body 21 without using any mounting members such as screws. This simplifies the assembly work of the lighting fixture 11.

[0036] In this way, the light source unit 41 and the power supply unit 31 are arranged in the fixture body 21, and the light source unit 41 and the power supply unit 31 are arranged in positions that do not overlap in a plan view but overlap in a side view (see FIG. 5).

[0037] Power supply unit 31 is electrically connected to connection unit 81, which is a small, vertically elongated terminal block, via wiring (not shown). For example, when mounting lighting fixture 11 to mounting portion C, power supply unit 31 is electrically connected to the external commercial power supply by connecting a power cable (not shown) from an external commercial power supply behind the ceiling to connection unit 81. Power supply unit 31 and light source unit 41 are electrically connected by wiring 37 (see FIG. 3). In this embodiment, a terminal block is used as the connection portion 81, but this is not particularly limited. For example, instead of using a terminal block, a connecting part such as a connector may be used.

[0038] The light source unit 41 is a part that emits light toward the illumination surface side of the lighting fixture 11. The light source unit 41 is a module substrate having light-emitting elements serving as light sources. In this embodiment, an LED light source module is used as the light-emitting elements, in which a plurality of LED (Light Emitting Diode) elements 42 serving as light sources are surface-mounted on a substrate 43. Specifically, the LED light source module is a light-emitting module in which a plurality of LED elements 42 are arranged in the circumferential direction on the surface of a substrate 43 that is machined into a substantially annular shape having a predetermined width. The light source unit 41 is attached to the light source mounting portion 23 with a plurality of (three in this embodiment) screw members 49. The substrate 43 is electrically connected to the power supply unit 31 by wiring 37. The LED light source module is fixed by abutting the back surface of the mounting surface of the substrate 43 against the mounting surface 23a of the light source mounting portion 23. Therefore, when the LED light source module generates heat, the heat from the LED light source module is transferred to the fixture body 21. When the ambient temperature is lower than the temperature of the fixture body 21, the heat transferred to the fixture body 21 is transferred to the air around the fixture body 21. As a result, the heat transferred to the fixture body 21 is dissipated to the surroundings of the fixture body 21 via the mounting surface 23a. In this embodiment, a surface-mounted LED element 42 is used as the light source, but the type of light source is not limited to an LED element, and it is also possible to use, for example, a COB type light emitting module or an organic EL element (OLED). Furthermore, the substrate 43 may be attached to the light source attachment portion 23 via a heat conductive sheet (not shown) or heat dissipation grease, thereby achieving higher heat dissipation properties.

[0039] The diffuser plate 51 is attached to the fixture body 21 so as to cover at least the illumination surface of the light source unit 41. It is a translucent member that reflects and diffuses light from the light source unit 41 (LED elements 42) while controlling the light distribution to the outside. The diffuser plate 51 is a disc-shaped member. The diffuser plate 51 is made of a translucent resin material. The diffuser plate 51 may be formed, for example, with a textured (frosted) surface that forms fine irregularities, or with a diffusing agent mixed inside. The outer diameter of the diffuser plate 51 is smaller than the outer diameter of the locking step 25 of the fixture body 21 (see FIG. 5 ) and can be locked to the locking step 25. The diffuser plate 51 closes the lower opening of the fixture body 21 to prevent dust and other particles from adhering to the LED elements 42. The diffuser plate 51 has a pair of screw mounting portions 51a formed on its side surfaces that protrude radially outward. The screw mounting portion 51a is attached to the screw mounting portion 25a of the instrument body 21 by a mounting member such as a screw.

[0040] The cover portion 61 is a member attached to the fixture body 21 so as to mainly cover the outer peripheral edge portion of the diffusion plate 51, the outer peripheral edge portion 26, and the outer portions of the side wall portions 27. The cover portion 61 is a substantially cylindrical member having an opening on the lower side for exposing the diffusion plate 51 and an open upper end. The cover portion 61 is formed of a resin material (for example, ABS resin (Acrylonitrile-Butadiene-Styrene)). The maximum inner diameter of the cover portion 61 is larger than the outer diameter of the fixture body 21, so that the cover portion 61 can be attached to the outside of the fixture body 21. The cover portion 61 has locking protrusions (not shown) on its inner wall surface. The locking protrusions are a plurality of protruding portions formed at predetermined intervals along the circumferential direction on the inner peripheral surface near the open end of the cover portion 61. The cover portion 61 is positioned relative to the fixture body 21 by locking the locking protrusions to the cover mounting portion 27a. The cover part 61 is structured so as to be detachable from the device body 21 for cleaning the inside or replacing parts of the device body 21, etc. Furthermore, the material of the cover portion 61 can be selected appropriately as needed, such as resin other than ABS resin, wood, metal, or the like.

[0041] The appliance body 21 is provided with the aforementioned cover attachment portion 27a for engaging the locking protrusion of the cover portion 61. Although details are omitted, when attaching the cover portion 61 to the appliance body 21, the cover portion 61 is attached to the appliance body 21 by inserting the locking protrusion into the cover attachment portion 27a of the appliance body 21, rotating the cover portion 61 in one circumferential direction, and engaging the locking protrusion. Furthermore, when the cover portion 61 is rotated in the other circumferential direction while attached to the appliance body 21, the locking protrusion of the cover portion 61 comes off the cover attachment portion 27a of the appliance body 21, and the cover portion 61 can be removed from the appliance body 21. The cover part 61 is rotated and attached to the device body 21. When the cover part 61 is attached, the device body 21 is fixed to the attachment part C by a fixing member. Therefore, even if the cover part 61 is rotated, the device body 21 does not rotate, and load is not easily applied to the connection part 81.

[0042] The rear cover portion 71 is a substantially circular flat plate member that covers the mounting surface side of the fixture body 21. The rear cover portion 71 is made of a metal material. The rear cover portion 71 has an insertion hole 71a in the center for inserting the connecting portion 81. The rear cover portion 71 has a pair of through holes 71b formed opposite each other across the insertion hole 71a to prevent interference of the heads of the screw members 86 with the rear cover portion 71. Parts of the heads of the pair of screw members 86 are exposed through the through holes 71b. Providing the through holes 71b to expose part of the heads of the screw members 86 prevents an increase in the height dimension of the fixture body 21. The rear cover portion 71 covers the mounting surface side of the fixture body 21 with the connecting portion 81 inserted through the insertion hole 71a and part of the heads of the screw members 86 exposed through the through holes 71b. The rear cover part 71 is attached with screw members 72 to a plurality of attachment parts 34 (three parts in this embodiment) provided on the attachment surface side of the fixture body 21. As a result, the fixing part 84 of the connection part 81 is interposed between the rear cover part 71 and the attachment surface 23a of the light source attachment part 23, and the fixing part 84 of the connection part 81 can be reliably held so as not to come off the attachment surface 23a of the light source attachment part 23.

[0043] The connection portion 81 is a small, vertically elongated terminal block that is electrically connected to the power supply unit 31 via an electric wire (wiring) and is used to electrically connect electric wires (wiring) such as power supply electric wires and feed wiring electric wires. The connection portion 81 is erected on the rear side (mounting surface side) of the mounting surface 23a of the light source mounting unit 23 in the fixture body 21, opposite the surface on which the light source unit 41 is disposed. In this embodiment, the connection portion 81 is erected on the surface of the fixture body 21 that faces the mounted portion C. The connection portion 81 has a quick-connect terminal member (not shown), a terminal housing 83, a fixing portion 84, and a cover 85. The fixing portion 84 is positioned by the locking portion 30b of the terminal mounting unit 30, and is attached to the mounting surface 30a by a screw member 86.

[0044] The quick-connect terminal member is formed by bending a metal plate, and one end (upper end) of the quick-connect terminal member is inserted with the core wire of a power supply cable or a feed wiring cable along the vertical direction of the device body 21. The core wire of the inserted cable is sandwiched between the metal plates and electrically connected, and the other end of the metal plate is electrically connected to the power supply unit 31 by wiring.

[0045] Terminal housing 83 is a vertically long, hollow, and generally cylindrical body made of electrically insulating resin. Terminal housing 83 accommodates a plurality of quick-connect terminal members. Terminal housing 83 has wire connection ports 82 into which core wires such as power supply wires and feed wiring wires are inserted.

[0046] The cover 85 is made of an elastic, electrically insulating resin such as silicone resin. It is attached to one end (top end) of the terminal housing 83 so as to cover the wire connection port 82. The core wires of the power supply wire, the feed wiring wire, etc. are pierced through the cover 85 and inserted into the wire connection port 82 to be electrically connected to the quick-connect terminal member. This connection prevents foreign matter such as dust and water droplets from entering the wire connection port 82.

[0047] (Installation procedure for the lighting fixture of this embodiment) An example of the installation procedure for the lighting fixture 11 of this embodiment will be described with reference to FIGS. 5 to 9. First, one end of an electric wire, such as a power cable or a feed wiring cable (hereinafter simply referred to as an electric wire), is pulled out toward the illumination surface through the through-hole H provided in the mounting portion C. Next, the cover portion 61 is rotated to remove it from the fixture body 21. Next, the core wire of the electric wire pulled out from the through-hole H is inserted into the cover 85 so as to penetrate through the cover 85 and inserted into the electric wire connection port 82 for electrical connection with the quick-connect terminal member. Next, the fixture body 21 is positioned at a desired position on the mounting portion C so that the electric wire and the terminal housing 83 of the connection portion 81 are inserted into the through-hole H. Next, the tips of the two fixing members are passed through the through-holes of the respective fixture mounting portions 28b of the fixture body 21 and screwed into the mounting portion C to fix the fixture body 21 to the mounting portion C. Finally, the cover portion 61 is rotated in the opposite direction from when it was removed to attach it to the fixture body 21. The above-described attachment procedure is an example, and the step of removing the cover portion 61 may be performed before or after the step of connecting the electric wires to the quick-connect terminal members.

[0048] According to the lighting fixture 11 of this embodiment described above, the lighting fixture 11 comprises a fixture body 21 that is cylindrical with a bottom and has a main portion 22 and a side wall portion 27 that surrounds the main portion 22, and that houses a light source portion 41 and a power supply portion 31 that supplies power to the light source portion 41. The fixture body 21 is formed to have a light source mounting portion 23 provided in the center of the main portion 22 and a power supply mounting portion 29 arranged around the light source mounting portion 23. The power supply portion 31 has a power supply circuit portion 32 and an annular circuit cover 33a that houses the power supply circuit portion 32. The circuit cover 33a has a shape that allows it to be placed on the power supply mounting portion 29 along the inner surface of the side wall 27 of the fixture body 21. With this configuration, circuit cover 33a is positioned by the inner circumferential surface of side wall 27 of fixture body 21, and can therefore be easily placed in power supply mounting portion 29 inside fixture body 21. This improves the ease of assembly of lighting fixture 11. In addition, circuit cover 33a is less likely to move inside fixture body 21, preventing misalignment and rattle.

[0049] In this embodiment, the circuit cover 33a is formed in a U-shape in cross section to form a recess, and the power supply circuit section 32 is preferably disposed in the recess. With this configuration, the power supply circuit section 32 can be easily placed in the recess in the circuit cover 33a, and the power supply unit can be integrated into a single unit. Furthermore, by assembling the power supply unit consisting of the power supply circuit section 32 and the circuit cover 33a into the fixture body 21 in advance, the work of attaching the power supply unit to the fixture body 21 can be divided into separate tasks, improving productivity. Furthermore, even if the size or number of power supply circuit sections 32 is changed to match the specifications of the boards of the power supply circuit sections 32, the power supply circuit section 32 can be integrated into a single unit by being placed in the recess in the power supply circuit section 32.

[0050] In this embodiment, the circuit cover 33a includes a first area S1 in which the power supply circuit section 32 is disposed, and a second area S2 that is continuous with the first area S1. With this configuration, not only is some of the heat generated by the electronic components and boards of power supply circuit unit 32 transferred to the surrounding air in first area S1 within circuit cover 33a, but some of the air in first area S1 can also convect toward second area S2, thereby enabling efficient heat dissipation in second area S2 as well, thereby improving the heat dissipation performance of lighting fixture 11.

[0051] In this embodiment, the circuit cover 33a has a top panel portion 33b that covers the top surface of the first area S1. With this configuration, the top panel 33b can cover the upper end of the circuit cover 33a that houses the power supply circuit section, thereby preventing dust from getting in. Furthermore, by providing a heat dissipation pad 33d on the top panel 33b, heat dissipation from the top panel 33b can be promoted.

[0052] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications are possible. For example, the shape of the lighting fixture may be other than a substantially circular shape in a plan view, such as a rectangular shape, a polygonal shape, or other shapes. [Explanation of symbols]

[0053] 11 Lighting fixtures 21. Instrument body 23 Light source mounting part 28 Fixing member placement section 29 Power supply mounting part 31 Power supply section 32 Power supply circuit section 33 Power Supply Case 33a Circuit cover 33b Top plate 33d heat dissipation pad 41 Light source section 51 Diffuser 61 Cover 81 Connection C Mounted part S1 First Area S2 Second Area

Claims

1. A lighting fixture comprising a fixture body having a bottomed cylindrical shape with a main portion and a side wall portion surrounding the main portion, the fixture body housing a light source portion and a power supply portion that supplies power to the light source portion, The fixture body is formed to have a light source mounting portion provided at the center of the main portion and a power supply mounting portion arranged around the light source mounting portion, the power supply unit has a power supply circuit unit and an annular circuit cover that houses the power supply circuit unit, The circuit cover has a shape that allows it to be placed on the power supply mounting portion along the inner surface of the side wall of the lighting fixture body.

2. The lighting fixture according to claim 1 , wherein the circuit cover is formed in a U-shape in cross section to form a recess, and the power supply circuit section is disposed in the recess.

3. The lighting fixture according to claim 2 , wherein the circuit cover comprises a first area in which the power supply circuit section is disposed, and a second area continuous with the first area.

4. The lighting fixture according to claim 3 , further comprising a top plate portion covering an upper surface of the first region of the circuit cover.

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