Lighting device

Abstract

The present invention provides a lighting device that makes it difficult for the light source unit to detach from the fixture body even when a downward force is applied to it. [Solution] The lighting device X comprises a cylindrical fixture body 1 that is attached to the installation site, and a light source unit 3 that emits light toward one side in the direction of the central axis extending from the central axis of the fixture body 1. The supported portion 39 of the light source unit 3 is supported by the support portion 23 of the fixture body 1, so that the light source unit 3 is detachably attached to the fixture body 1. The support portion 23 of the fixture body 1 has a guide portion 231 that guides the supported portion 39 in the direction of the central axis, and a support portion 232 that is formed along the circumferential direction around the central axis from the other end of the guide portion 231 in the direction of the central axis and supports the supported portion 39.

Description

Technical Field

[0001] The present invention relates to a lighting device in which a light source unit is detachably attached to an appliance body.

Background Art

[0002] As a lighting device, a device including a support frame for a downlight fixed to a mounting hole in a ceiling and a light source unit attached to the support frame has been proposed (for example, Patent Document 1). In this lighting device, the light source body of the light source unit is attached by inserting it into the support frame and pushing it upward (see FIG. 4). At this time, the light source unit is fixed to the support frame by fitting the concave portion of the light source body to the convex portion formed on the inner surface of the attachment portion of the support frame (paragraph 0015).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above lighting device, since only the concave portion and the convex portion are fitted, if a strong force is applied downward to the light source unit, the light source unit may be removed from the support frame. Note that the appliance body corresponds to the support frame in the background art. An object of the present invention is to provide a lighting device that is difficult to be detached from the appliance body even when a force is applied downward to the light source unit.

Means for Solving the Problems

[0005] The lighting device according to the present invention comprises a cylindrical fixture body that is attached to an installation site, and a light source unit that emits light toward one side in the direction of the central axis extending from the central axis of the fixture body, wherein the supported portion of the light source unit is supported by a support portion of the fixture body, so that the light source unit is detachably attached to the fixture body, and the support portion of the fixture body has a guide portion that guides the supported portion in the direction of the central axis, and a support portion that is formed along the circumferential direction around the central axis from the other end of the guide portion in the direction of the central axis and supports the supported portion. [Effects of the Invention]

[0006] With the above configuration, even if a downward force is applied to the light source unit, it is less likely to detach from the support frame. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view of the lighting device according to the first embodiment, where (a) is a view from the front and (b) is a view from the back. [Figure 2] These are perspective views of the disassembled lighting device; (a) is a view from the back, and (b) is a view from the front. [Figure 3] This is a perspective view of the disassembled light source unit, seen from the front. [Figure 4] This is a perspective view of the disassembled light source unit, seen from the back. [Figure 5] These are cross-sectional views of the reflector; (a) is a view from a direction perpendicular to the cross-section, and (b) is a perspective view from the back. [Figure 6] (a) is a perspective view of the device body with the cover removed, seen from the back, and (b) is a perspective view of the device with the mounting spring, spring body, and reflector support removed from the frame, seen from the back. [Figure 7] These are perspective views of the frame in its disassembled state; (a) is a view from the back, and (b) is a view from the front. [Figure 8](a) is a view of the cover from the central axis side, (b) is a perspective view of the cover from the back side, and (c) is a perspective view from the back side of the cover attached to the frame body. [Figure 9] (a) is a view of the heat dissipation holder from the back, (b) is a view of the frame body from the back, (c) is a view of the supported part in the position of the guide part from the front, and (d) is a view of the supported part in the position of the support part from the front. [Figure 10] This is a perspective view of the lighting device according to the second embodiment, where (a) is a view from the front and (b) is a view from the back. [Figure 11] These are perspective views of the disassembled lighting device; (a) is a view from the back, and (b) is a view from the front. [Figure 12] This is a perspective view of the disassembled light source unit, seen from the front. [Figure 13] This is a perspective view of the disassembled light source unit, seen from the back. [Figure 14] This is a diagram of the supported part; (a) is a view from the central axis side, and (b) is a cross-sectional view. [Figure 15] This is a perspective view from the back of the disassembled frame with the mounting spring removed. [Figure 16] This is a perspective view of the disassembled light source support section, seen from the back. (a) is a view from the radially outward side, and (b) is a view from the central axis side. [Figure 17] This is a diagram of the light source support section. (a) is a cross-sectional view taken from the central axis side, (b) is a perspective view taken from the back side with the case removed, and (c) is a perspective view taken from the back side with the plate-like part removed, radially outward. [Figure 18] This diagram illustrates the operation of attaching the supported portion (protrusion) of the light source unit to the support portion of the fixture body. (a) is a view from the central axis side showing the protrusion in the position of the guide portion, and (b) is a view from the central axis side showing the protrusion in the position of the support portion. [Figure 19] (a) is a view of the light source unit from the back, and (b) is a view of the fixture body from the back. [Figure 20] This is a diagram for explaining the operation of mounting the supported part (protrusion) of the light source unit on the support part of the appliance body. (a) is a view from the front side showing the state where the protrusion is located in the guiding part, and (b) is a view from the front side showing the state where the protrusion is located in the supporting part. The back side part of the connecting body is cut to show the position of the protrusion. [Figure 21] This is a view of the lighting device according to the third embodiment seen from the direction of the rotation axis. (a) shows the state where the central axis of the light source unit is parallel to the vertical direction, and (b) shows the state where the central axis of the light source unit is inclined with respect to the vertical direction. [Figure 22] This is a view of the cross-section in the state of Fig. 21(b) seen from the direction of the rotation axis. [Figure 23] This is a perspective view of the lighting fixture removed from the mounting fixture. (a) is a view seen from the back side, and (b) is a view seen from the front side. [Figure 24] (a) is a perspective view of the frame seen from the back side, (b) is an enlarged cross-sectional view of the mounting part and the position regulating part, and (c) is an enlarged perspective view of the mounting part and the position regulating part. [Figure 25] This is a perspective view of the lighting fixture in a disassembled state. (a) is a view seen from the front side, and (b) is a view seen from the back side. [Figure 26] This is a perspective view of the light source unit in a disassembled state. (a) is a view seen from the back side, and (b) is a view seen from the front side. [Figure 27] This is a perspective view of the disassembled state of the unit body seen from the back side. [Figure 28] This is a perspective view of the disassembled state of the unit body seen from the front side. [Figure 29] This is an enlarged cross-sectional view around the mounting part of the mounting fixture and the lighting fixture. (a) shows the mounted state, and (b) shows the state immediately before mounting. [Figure 30] This is a perspective view of the lighting device according to the fourth embodiment seen from the back side. [Figure 31] This is a perspective view of the disassembled state of the lighting device seen from the back side. [Figure 32] This is a perspective view of the disassembled state of the light source unit seen from the front side. [Figure 33] This is a perspective view of the disassembled light source unit, seen from the back. [Figure 34] This is a view of the light source unit from the back, with the circuit module removed. [Figure 35] This is a cross-sectional view of the device body; (a) is a view from a direction perpendicular to the cross-section, and (b) is a perspective view of the cross-section from the back. [Figure 36] This is a perspective view of the disassembled device body, seen from the back. [Figure 37] This is a perspective view of the disassembled device body, seen from the front. [Figure 38] This is a perspective view of the holder with the conductive piece and socket removed, where (a) is a view from the back and (b) is a view from the front. [Modes for carrying out the invention]

[0008] <First Embodiment> 1. Overall This will be explained using Figures 1 and 2. The lighting device X comprises at least a fixture body 1, which is mounted on an installation site such as a ceiling, and a light source unit 3 that is detachably attached to the fixture body 1. In this case, it also comprises a reflector 5 that is detachably attached to the fixture body 1. The lighting device X is a so-called downlight type. Therefore, the fixture body 1 is installed by being inserted into an installation hole (not shown) in the ceiling, for example, and the installed state is maintained by an installation spring 21. The main body of the device 1 is cylindrical, and the direction in which its central axis (cylindrical axis) extends (the central axis direction) is defined as the front and back direction, with the side from which light is emitted from the light source unit 3 being the front side. In this embodiment, the front and back direction coincides with the direction in which the light source unit 3 emits light and the up and down direction, and the front side may also be described as the bottom side and the back side as the top side. In other words, the light source unit 3 emits light toward one side (the front side) in the direction of the central axis. The other side (the back) in the direction of the central axis is the opposite side from the one side (the front). Furthermore, the "circumferential direction" and "radial direction" are based on the central axis of the fixture body 1. Note that the central axis of the fixture body 1 coincides with or approximately coincides with the central axis of the lighting device X. The fixture body 1 includes an installation spring 21 that maintains the fixture body 1 in the position inserted into the installation hole, a light source support part 23 that supports the supported portion 39 of the light source unit 3, and a support part 22 that supports the supported portion 53 of the reflector 5. For convenience, the support part 23 for the light source unit 3 and the support part 22 for the reflector 5 are referred to as the "light source support part" and the "reflector support part." The supported portion 39 and the light source support part 23 correspond to examples of the supported portion and support part of Invention 1 and Invention 2. The light source unit 3 has a light source section that emits light and a heat dissipation section that releases heat from the light source section, facing in opposite directions. After being inserted into the interior of the fixture body 1 from the heat dissipation section side toward the rear, it is attached by rotating it in one direction in the circumferential direction around the central axis, and removed by rotating it in the other direction in the circumferential direction from the attached state. The rotation direction when attaching and detaching the light source unit 3 is defined as one side as the attachment direction and the other side as the detachment direction. Note that in this case, the attachment direction is counterclockwise when viewed from the rear side. The reflector 5 reflects the light emitted from the light source unit 3 toward the surface to be illuminated. The following describes each part.

[0009] 2. Light source unit This will be explained primarily using Figures 2 to 4. The light source unit 3 comprises at least a base plate 30, a light source module 31 disposed on the surface of the base plate 30, and heat sinks (36, 37) disposed on the back surface of the base plate 30. In this light source unit 3, in addition to the base plate 30, light source module 31, and heat sinks (36, 37), it also includes a holder 32 for fixing the light source module 31 to the base plate 30, an optical processing unit 34 for performing optical processing on the light emitted from the light source module 31, a holder 33 for fixing the optical processing unit 34, a cover 35 that covers the front side of the base plate 30, and a holder 38 for fixing the heat sinks (36, 37) to the base plate 30. For convenience, the holders 32 for the light source module 31, 33 for the optical processing unit 34, and 38 for the heat sinks (36, 37) will be referred to as "light source holder," "optical holder," and "heat sink holder" respectively in order to distinguish between them. The light source unit is composed of, for example, a light source module 31, a light source holder 32, an optical holder 33, an optical processing unit 34, and a cover 35. The heat dissipation section is composed of, for example, heat sinks (36, 37) and a heat dissipation holder 38, and has a support portion 39 for which the light source unit 3 is supported by the fixture body 1. The base plate 30 may constitute a light source, or a heat dissipation section, or the light source may be provided on the front side of the base plate 30 and the heat dissipation section on the back side of the base plate 30. The following describes each part.

[0010] This will be explained primarily using Figures 3 and 4. (1) Base plate The base plate 30 has, for example, a circular or similar shape. The base plate 30 is made of, for example, a metal material (aluminum) or a resin material. The base plate 30 has a protrusion 30a on its surface for positioning the light source module 31. The base plate 30 has screw holes 30b for fixing the light source holder 32 with screws 329, screw holes 30c for fixing the cover 35 with screws 359, and through holes 30d through which screws 389 for fixing the heat dissipation holder 38 are inserted. The screw holes 30b, 30c and the through holes 30d are formed in the front-back direction.

[0011] (2) Light source module The light source module 31 has LEDs (light sources) mounted on a substrate 311. Here, a COB package is used for the light source module 31. For the substrate 311, for example, an aluminum substrate can be used to improve heat dissipation. The substrate 311 is rectangular, and the resin 312 covering the LEDs is circular.

[0012] (3) Light source holder The light source holder 32 corresponds to the shape of the base plate 30, and in this case, it is circular. The light source holder 32 has a recess 321 for the light source module 31 in the center of its back side. The recess 321 is shaped to match the substrate 311, and in this case, it is rectangular. The recess 321 has a circular through hole 322 that matches the resin 312 of the light source module 31. The light source holder 32 has a through hole for a screw 329. The light source holder 32 is fixed to the base plate 30 with the resin 312 of the light source module 31 inserted into the through hole 322 from the back side, and the substrate 311 fitted into the recess 321 from the back side.

[0013] (4) Optical processing unit and optical holder The optical holder 33 has a cylindrical (cone-shaped) form that widens on the front side. The optical holder 33 is detachably attached to the light source holder 32 by engaging the engaged portion 333 on the back side with the engaged portion 323 of the light source holder 32. The optical processing unit 34 diffuses light from the light source module 31, for example. Here, it is composed of a diffuser plate in which at least one of the front and back surfaces is an uneven surface. The optical processing unit 34 is disc-shaped. The optical processing unit 34 is detachably attached to the optical holder 33 by fitting into the stepped portion 331 on the front side of the inner circumferential surface of the optical holder 33 and being locked by the locking portion 332 on the front side of the optical holder 33.

[0014] (5) Cover The cover 35 has a cylindrical portion 351. The cover 35 covers the light source module 31, the light source holder 32, and the optical holder 33 with the optical processing unit 34 positioned in the opening on the front side of the cylindrical portion 351. The cover 35 has an overhang 352 that extends radially from the back end of the cylindrical portion 351, and the cover 35 is fixed to the base plate 30 by screws 359 that pass through holes in the overhang 352, with the overhang 352 in contact with the surface of the base plate 30.

[0015] (6) Heat sink The heat sink consists of a heat sink fin 36 made of a thin metal plate curved into a "U" shape, and a cylindrical heat sink column 37. The heat dissipation column 37 has a solid cylindrical portion 371 and is positioned in the center of the back surface of the base plate 30. The heat dissipation column 37 has an overhanging portion 372 that extends radially from the front end of the cylindrical portion 371. There are multiple heat dissipation fins 36, which are arranged on the back surface of the base plate 30 around the heat dissipation column 37. Each heat dissipation fin 36 has a pair of edges 361, 361 extending in the front-back direction, and a connecting portion 362 that connects the front ends of the pair of edges 361, 361. The heat dissipation fins 36 are provided on the base plate 30 with the connecting portion 362 in contact with the base plate 30. When viewed from the back side (above), the connecting portion 362 of the heat dissipation fins 36 has a trapezoidal or fan-shaped form, where the circumferential dimension increases as it moves radially outward. This allows many heat dissipation fins 36 to be provided on the base plate 30.

[0016] (7) Heat dissipation holder The heat dissipation holder 38 supports the heat dissipation fins 36 and the heat dissipation column 37 with the base plate 30. More specifically, the heat dissipation holder 38 and the base plate 30 support the protruding portion 372 of the heat dissipation column 37 and the connecting portion 362 of the heat dissipation fins 36 by sandwiching them between them. The heat dissipation holder 38 is shaped to match the base plate 30, and in this case, it is circular or nearly circular. The heat dissipation holder 38 has a circular through-hole 381 through which the cylindrical portion 371 of the heat dissipation column 37 is inserted, and a rectangular (groove-shaped) through-hole 382 through which a pair of side portions 361 of the heat dissipation fins 36 are inserted. The through-hole 381 is formed in the center, and multiple through-holes 382 are formed around the through-hole 381 at intervals along the circumferential direction. The heat dissipation holder 38 has screw holes 383 for screws 389, and is fixed to the base plate 30 by screwing the screws 389, which are inserted through holes 30d in the base plate 30, into the screw holes 383. (8) Supported part The supported portion 39 is provided on a component that makes up the light source unit 3. The component is, for example, a base plate 30 and a heat dissipation holder 38, and in this case, it is integrally provided on the heat dissipation holder 38. The supported portion 39 is composed of a protruding portion (convex portion) that projects radially outward from the outer circumferential surface of the heat dissipation holder 38. There are two supported portions 39, which are provided at opposing locations on either side of the center of the heat dissipation holder 38. The protruding portion (convex portion) corresponds to an example of the convex portion of Invention 2. When viewed from the front or back, the heat dissipation holder 38 has an arc-shaped portion 385 with an arc-shaped outer edge, a chord-shaped portion 386 with a chord-shaped outer edge, and a supported portion (protruding portion) 39. When viewed from the back (as shown in Figure 4), with respect to the supported portion 39, the chord-shaped portion 386 is on the attachment side when attaching or detaching the light source unit 3, and the arc-shaped portion 385 is on the detachment side. The center of the arc-shaped portion 385 in the heat dissipation holder 38 is located on or close to the central axis of the device body 1. The arc-shaped portion 385, the chord-shaped portion 386, and the supported portion 39 are provided in pairs in a rotationally symmetrical manner with respect to the central axis.

[0017] 3. Reflector This will be explained primarily using Figure 5. The reflector 5 comprises a reflector 51 that reflects light from the light source unit 3, and an upper member 52 provided on the back side (above) of the reflector 51. A supported portion 53 is formed by a radial recess formed by the upper member 52 and the reflector 51, and the supported portion 53 is engaged with the reflector support portion 22 (spring), thereby allowing the reflector to be detachably attached (supported) to the fixture body 1. The reflector 51 integrally comprises a cylindrical portion 511 that widens on the front side, an extended portion 512 that extends radially outward from the front end of the cylindrical portion 511, and an extended portion 513 that extends radially inward from the back end of the cylindrical portion 511. The upper member 52 integrally comprises a cylindrical portion 521 that widens on the back side, an extended portion 522 that extends radially inward from the front end of the cylindrical portion 521, and an extended portion 523 that extends radially outward from the back end of the cylindrical portion 521. The upper member 52 is fixed to the reflector 51 by the extension portion 522 contacting the extension portion 513 of the reflector 51, and the inner circumferential end portion 513a of the extension portion 513 of the reflector 51 being folded back to the back side and clamped.

[0018] 4. Main body of the device Let's explain using Figure 2. As shown in Figure 2, the main body of the device 1 comprises a frame 10 and a cover 11. This enhances the aesthetic appearance. The cover 11 is fixed to the frame 10 by screws 119. The fixture body 1 includes a mounting spring 21 and a reflector support part 22 on the frame 10, and a light source support part 23 on the frame 10 and the cover 11. As shown in Figure 2(b), the light source support portion 23 has a front-to-back guide portion 231 formed across the frame 10 and the cover 11, and a support portion 232 formed on the frame 10 and extending circumferentially from the guide portion 231. The guide portion 231 and the support portion 232 correspond to examples of the guide portion and support portion of Invention 1.

[0019] (1) Frame This will be explained primarily using Figure 6. The frame 10 comprises a frame body 13 that supports the light source unit 3, a decorative frame 14 positioned on the front side, and connecting members 15 that connect the frame body 13 and the decorative frame 14 on the front and back sides. In this case, there are two connecting members 15 spaced apart in the circumferential direction. The frame 10 is equipped with a spring body 24 on the frame body 13 for fixing the light source unit 3 in its mounted state. The spring body 24 also has the function of restricting the movement of the light source unit 3.

[0020] (1-1) Frame body This will be explained primarily using Figure 7. The frame body 13 has a cylindrical portion 131 having notched portions 131a, 131a on opposite sides of the central axis, and a protruding portion 132 that extends radially outward from above the notched portions 131a, 131a of the cylindrical portion 131.

[0021] (1-1-1) Cylinder part When viewed from the front and back directions, that is, in a cross-section perpendicular to the central axis, the cylindrical portion 131 has an arc-shaped circumferential wall portion 131b and a chord-shaped (straight) chord-shaped circumferential wall portion 131c, facing each other across the central axis.

[0022] The notched portion 131a is formed to extend from the front side to the protruding portion 132. A connecting body 15 is placed in the notched portion 131a. This makes the radial dimensions of the frame 10 more compact.

[0023] The circumferential wall portion 131b is adjacent to the missing portion 131a on the side that is circumferentially removed. The chord circumferential wall portion 131c is adjacent to the missing portion 131a on the side that is circumferentially attached, and adjacent to the circumferential wall portion 131b on the side that is circumferentially removed.

[0024] The cylindrical portion 131 has a screw hole 131e for a screw 119 (see Figure 2(b)) for fixing the cover 11 to the frame body 13, a through hole 131f for a rivet 249 for fixing the spring body 24 to the frame body 13, and a through groove 131g for forming the light source support portion 23 in the chord-peripheral wall portion 131c. Two screw holes 131e are formed on the back side (upper side) in the front-back direction, along the circumferential direction. Two through holes 131f are formed along the circumferential direction in the middle portion of the front-to-back direction. The spring body 24 may also be fixed by screws. In this case, the through holes 131f become screw holes. The through groove 131g has a vertical groove 131h extending in the front-to-back direction and a horizontal groove 131i extending from the back end (upper end) of the vertical groove 131h in the front-to-back direction in the circumferential mounting direction. The through groove 131g as a whole is in the shape of an inverted "L". The vertical groove 131h constitutes a part of the guide portion 231 of the light source support portion 23 (the back side portion (upper portion) in the front-to-back direction). The horizontal groove 131i constitutes the support portion 232 of the light source support portion 23. In the longitudinal groove 131h, the groove width (circumferential dimension) at the front end (one end) is larger than the groove width at the back end (the other end) in the front-to-back direction. This makes it easier to guide the supported portion 39 to the back side in the front-to-back direction. The longitudinal groove 131h is formed such that the groove width decreases as you move from the front side to the back side. In other words, in the longitudinal groove 131h, the surfaces facing each other in the circumferential direction are arranged in a "V" shape when viewed from the radial direction. The back end surface (the other end surface) of the longitudinal groove 131h is an inclined surface that moves to the back side (the other side) in the front-to-back direction as it moves away from the transverse groove 131i (support portion) in the circumferential direction. The horizontal groove 131i is formed to connect to the back end of the vertical groove 131h. The circumferential length of the horizontal groove 131i is 0.6 to 1.3 times, preferably 0.8 to 1.1 times, the circumferential length of the supported portion 39 of the light source unit 3. This ensures sufficient contact area with the supported portion 39, and the supported portion 39 is firmly supported.

[0025] The cylindrical portion 131 has a rib portion 131j on the inner surface of the circumferential wall portion 131b. The rib portion 131j only needs to be formed on at least one of the pair of circumferential wall portions 131b, and in this case, it is formed on both circumferential wall portions 131b. The rib portion 131j protrudes radially inward from the inner surface and extends continuously or discontinuously in the circumferential direction. The rib portion 131j is formed so that when the supported portion 39, which moves to the back side in the front-back direction along the longitudinal groove 131h, comes into contact with or approaches the back end (the end face of the other end of the guide portion 231), it comes into contact with or approaches the back surface of the heat dissipation holder 38. This allows the movement of the light source unit 3 to the back side to be restricted not only by the guide portion 231 but also by the frame body 13 when mounting the light source unit 3.

[0026] (1-1-2) Overhang The protruding portion 132 extends outwards so as to cover the missing portions 131a, 131a on either side of the central axis. The protruding portion 132 has through holes for fixing the connecting body 15 with screws 159.

[0027] (1-2) Decorative frame The decorative frame 14 comprises an annular portion 141 that covers the opening edge of the installation hole on the installation surface (which is the ceiling surface, etc.) from the front side, and a cylindrical portion 142 that extends from the inner peripheral edge of the annular portion 141 to the back side in the front-back direction. The decorative frame 14 has a stepped portion 141a on its inner circumference into which the extended portion 512 of the reflector 5 is fitted. The cylindrical portion 142 has a through hole 142a for fixing the connecting body 15 with a rivet 158, a notched portion 142b for the reflector support portion 22, and a through hole 142c for fixing the reflector support portion 22 with a rivet 229.

[0028] (1-3) Connector The connecting body 15 is constructed by bending a metal plate. The connecting body 15 has a rectangular main body portion 151 that is long in the front-to-back direction, lateral bent portions 152 that bend toward the central axis from both ends in the short direction of the main body portion 151, and an upper bent portion 153 that bends toward the central axis from the back end in the longitudinal direction of the main body portion 151. The main body 151 has a through hole 151a for the mounting spring 21 and a through hole for the rivet 158 ​​for fixing the connecting body 15 to the decorative frame 14. The upper bent portion 153 has a screw hole 153a for a screw 159 that fixes the connecting body 15 to the frame body 13.

[0029] (2) Cover As shown in Figure 2, the cover 11 covers the space between the pair of connecting members 15 in the frame body 13 from the radially outward direction. The outer surface of the cover 11 has an arc shape in a cross-section perpendicular to the central axis. This enhances the aesthetic appearance of the main body of the device 1. The following explanation will use Figure 8. The cover 11 has a circumferential wall opposing portion 111 that faces the circumferential wall portion 131b of the cylindrical portion 131 of the frame body 13, and a chord circumferential wall opposing portion 112 that faces the chord circumferential wall portion 131c of the cylindrical portion 131, in the circumferential direction.

[0030] The circumferential wall opposing portion 111 has multiple rib portions 111a on its inner circumferential surface. The rib portions 111a are formed to intersect in the front-back direction and the circumferential direction. The chord circumferential wall opposing portion 112 has through holes 112a for screws to fix the cover 11 to the frame body 13 in the boss portion 112b. Here, two holes are formed near the back end in the front-back direction, spaced apart in the circumferential direction.

[0031] The chord-circumferential wall opposing portion 112 is the front end in the front-back direction and has a pair of convex portions 112c and 112d that are spaced apart in the circumferential direction. The convex portions 112c and 112d protrude from the inner circumferential surface in a "U" shape. A groove 112g is formed between the circumferentially opposing side surfaces 112e and 112f of the pair of convex portions 112c and 112d. The groove 112g constitutes part of the guide portion 231 of the light source support portion 23. In other words, the groove 112g of the cover 11 and the vertical groove 131h of the frame body 13 (cylindrical portion 131) constitute the guide portion 231 of the light source support portion 23. The back end of groove 112g connects to the front end of longitudinal groove 131h. In the front-to-back direction, the groove width (circumferential dimension) at the front end (one end) of groove 112g is larger than the groove width at the back end (the other end). This makes it easier to guide the supported portion 39 to the back side in the front-to-back direction. Groove 112g is formed such that the groove width decreases as you move from the front side to the back side. In other words, in groove 112g, the surfaces facing each other in the circumferential direction are "V" shaped when viewed from the radial direction. The pair of side surfaces 112f, 112f that constitute groove 112g are inclined so that they move closer to each other as you move from the front side to the back side in the front-to-back direction. Furthermore, the groove width at the back end of groove 112g and the groove width at the front end of vertical groove 131h are approximately the same, or the front end of vertical groove 131h is smaller. This allows the supported portion 39 to move smoothly in the front-back direction.

[0032] (3) Spring part This will be explained using Figure 6. The spring body 24 integrally comprises a flat plate portion 241, a spring portion 242, and a connecting portion 243 that connects the flat plate portion 241 and the spring portion 242. The spring body 24 is provided on the outer surface of the chord-peripheral wall portion 131c of the cylindrical portion 131 and is configured to be housed within the cover 11.

[0033] The flat plate portion 241 has a rectangular shape that is elongated in the circumferential direction of the frame body 13. The flat plate portion 241 has two through holes for rivets 249 that fix the spring body 24 to the frame body 13, spaced apart in the longitudinal direction of the flat plate portion 241. The spring body 24 is located above the through groove 131g in the chord circumferential wall portion 131c of the cylindrical portion 131 of the frame body 13 (on the back side in the front-back direction). This allows the spring body 24 to be made smaller.

[0034] The connecting portion 243 connects the flat plate portion 241 and the spring portion 242, with the connecting portion 243 facing the lateral groove 131i of the frame body 13 on the radially outward side.

[0035] The connecting portion 243 and the spring portion 242 are plate-shaped and continuous in the circumferential direction. The spring portion 242 is configured to allow the supported portion 39 to pass by contacting the supported portion 39 and elastically deforming on the path through which the supported portion 39 moves circumferentially from the other end (back end) in the direction of the central axis (front and back) of the guide portion 231 (vertical groove 131h). In other words, the spring portion 242 is provided in a position that interferes with the moving supported portion 39, and when it comes into contact with the supported portion 39 moving in the lateral groove 131i, it elastically deforms. The direction of elastic deformation is radial. Note that the spring portion 242 corresponds to an example of the spring portion of Invention 1. The spring portion 242 extends circumferentially from one end of the connecting portion 243. The spring portion 242 is bent in a "V" shape so that its tip faces radially inward. The tip of the "V"-shaped spring portion 242 is positioned on the detachment side in the circumferential direction relative to the supported portion 39 located within the lateral groove 131i (support portion 232), and is positioned to face it in the circumferential direction. As a result, when the mounted light source unit 3 attempts to move in the detachment direction, the supported portion 39 comes into contact with the spring portion 242, restricting its movement. Furthermore, the protruding portion of the supported part 39 has a rounded end in the circumferential direction at the tip in the protruding direction. This allows the supported part 39 to pass smoothly in the circumferential direction.

[0036] 5. Attaching the light source unit to the fixture body. This will be explained primarily using Figure 9. (1) Operation The operation of attaching the light source unit 3 to the fixture body 1 will be explained. (a) Lead out the connector of the power unit in the ceiling space through the mounting hole in the ceiling of the mounting surface. (b) Insert the fixture body 1 through the installation hole and use the mounting spring 21 to attach the inserted fixture body 1 to the ceiling. (c) Connect the power supply connector (not shown) of the light source unit 3 to the connector of the power supply unit that was derived. (d) Insert the light source unit 3 into the frame 10 of the fixture body 1. Specifically, hold the cover 35 of the light source unit 3 and align the supported portion 39 of the light source unit 3 with the guide portion 231 of the light source support portion 23 of the fixture body 1 (aligning it so that the supported portion 39 can be inserted into the groove 112g of the cover 11 of the fixture body 1), and then insert it. (e) Push the light source unit 3 up to the back side of the guide portion 231, that is, to the back end (the other end). (f) With the light source unit 3 in the raised position, rotate it in the circumferential direction with respect to the central axis of the fixture body 1. By rotating it, the supported part 39 is guided to the supported part 232 in the horizontal groove 121i which is continuous with the vertical groove 131h of the frame 10 of the fixture body 1. (g) During rotation, the supported portion 39 of the light source unit 3 comes into contact with the spring portion 242 of the fixture body 1. However, if the light source unit 3 is rotated in the direction of contact, the spring portion 242 will elastically deform, allowing rotation in the direction of contact, and the supported portion 39 will move towards the back of the support portion 232 of the light source support portion 23 of the fixture body 1. (h) This completes the attachment of the light source unit 3 to the fixture body 1. To remove the light source unit 3, simply reverse the installation process described above, that is, perform steps (g) through (a) in order.

[0037] (2) Structure (2-1) Supported part As shown in Figure 9(a), the supported portion 39 protrudes radially outward from the imaginary line L1 which is an extension of the arc of the arc-shaped portion 358, and as shown in Figure 9(d), its protruding tip protrudes radially outward from the outer surface of the chord peripheral wall portion 131c of the frame body 13 (the support portion 232 of the supported portion 39 (see Figure 2(b))). This ensures that the supported portion 39 is reliably supported by the light source support portion 23. The gap between the arc-shaped portion 385 of the heat dissipation holder 38, on which the supported portion 39 is provided, and the inner surface of the circumferential wall portion 131b of the frame body 13 is smaller than the distance from the outer surface of the chord-shaped circumferential wall portion 131c to the protruding tip of the supported portion 39. As a result, even if the light source unit 3 moves radially within the fixture body 1, the supported portion 39 will not detach from the light source support portion 23. The heat dissipation holder 38 has a pair of arc-shaped parts 385, chord-shaped parts 386, and supported parts 39 arranged rotationally symmetrically with respect to the central axis. This allows it to be attached to the fixture body regardless of the orientation of the light source unit.

[0038] (2-2) Support part As shown in Figure 9(b), the outer surface of the chord-peripheral wall portion 131c of the frame body 13 of the fixture body 1 is located inside the imaginary line L2 which includes the arc of the outer surface of the circumferential wall portion 131b. This ensures that the supported portion 39 is reliably supported by the light source support portion 23 without increasing the outer circumference of the cylindrical portion 131 of the frame body 13. The protruding tip of the supported portion 39, located within the light source support portion 23 (groove 112g in the cover 11 and through groove 131g in the cylindrical portion 131), is positioned inward from the imaginary line L2 which includes the arc of the outer surface of the circumferential wall portion 131b, as shown in Figures 9(c) and (d). This prevents the supported portion 39 from interfering with the inner surface of the chord-circumferential wall opposing portion 112 of the cover 11 (see Figure 8).

[0039] (2-3) Frame body and heat dissipation holder As shown in Figure 9(b), the inner surface of the chord-shaped circumferential wall portion 131c of the frame body 13 is located inside the imaginary line L3 which includes the arc of the inner surface of the circumferential wall portion 131b. On the other hand, as shown in Figure 9(a), the chord-shaped portion 386 of the heat dissipation holder 38 is located radially inward from the imaginary line L1. When the supported portion 39 is located within the guide portion 231 of the light source support portion 23 (groove 112g of the cover 11 and vertical groove 131h of the cylindrical portion 131), as shown in Figure 9(c), the chord-shaped circumferential wall portion 131c of the frame body 13 and the chord-shaped portion 386 of the heat dissipation holder 38 face each other radially, and the circumferential wall portion 131b of the frame body 13 and the arc-shaped portion 385 of the heat dissipation holder 38 face each other radially. In other words, the outer shape of the heat dissipation holder 38 corresponds to the shape of the inner surface of the cylindrical portion 131 of the frame body 13. As a result, even if the light source unit 3 is moved (rotated) in the circumferential direction, there is no risk of interference between the light source unit 3 and the fixture body 1.

[0040] (2-4) Others The back end surface of the guide portion 231 (vertical groove 131h of the frame body 13) in the front-to-back direction is an inclined surface that moves to the back side in the front-to-back direction as it moves away from the support portion 232 (horizontal groove 131i) in the circumferential direction. As a result, the contact area between the guide portion 231 and the supported portion 39 is reduced, making it easier (with less force) to move the supported portion 39 to the support portion 232.

[0041] <Second Embodiment> 1. Overall This will be explained using Figures 10 and 11. The lighting device Y comprises at least a fixture body 1001 which is mounted on an installation site such as a ceiling, and a light source unit 1003 which is detachably attached to the fixture body 1001. In this case, it also comprises a reflector 5 which is detachably attached to the fixture body 1001. Note that the same reference numerals are used for components identical to those in the first embodiment, and their descriptions are omitted. The lighting device Y is a so-called downlight type, and the fixture body 1001 is installed by being inserted into an installation hole (not shown) in the ceiling, for example, and the installed state is maintained by an installation spring 21. The fixture body 1001 has an overall elongated shape in the direction into which the light source unit 1003 is inserted, with the direction in which its central axis extends being the central axis direction or the front-to-back direction, and the side from which light is emitted from the light source unit 1003 being the front side. In this embodiment, the front and back directions coincide with the direction in which the light source unit 3 emits light and the up and down directions, and the front side may be described as the bottom side and the back side as the top side. Furthermore, the "circumferential direction" and "radial direction" are based on the central axis of the fixture body 1001. Note that the central axes of the fixture body 1001 and the light source unit 1003 coincide with or approximately coincide with the central axis of the lighting device Y. The main body of the device 1 includes a mounting spring 21, a light source support part 1023 that supports the supported part 1040 of the light source unit 1003, and a reflector support part 22. The supported part 1040 and the light source support part 1023 correspond to examples of the supported part and support part of Invention 1 and Invention 2. The light source unit 1003 has a light source section that emits light and a heat dissipation section that releases heat from the light source section, facing in opposite directions. After being inserted into the interior of the fixture body 1001 from the heat dissipation section side toward the rear, it is mounted when rotated in one direction in the circumferential direction around the central axis (attachment direction), and removed when rotated in the other direction in the circumferential direction from the mounted state (detachment direction). The rotation direction when attaching and detaching the light source unit 3 is the same as in the first embodiment. The following describes each part.

[0042] 2. Light source unit This will be explained primarily using Figures 12 and 13. The light source unit 1003 comprises at least a base body 1030, a light source module 31 disposed on the surface of the base body 1030, and a heat sink 1036 disposed on the back surface of the base plate 30. In this light source unit 1003, in addition to the base body 1030, light source module 31, and heat sink 1036, the light source unit 1003 includes a light source holder 32, an optical holder 33, and an optical processing unit 1034 that is held by the optical holder 33 and performs optical processing on the light emitted from the light source module 31. The light source module 31 is attached to the base body 1030 via a thermal sheet 1035. The light source section is composed of, for example, a light source module 31, a light source holder 32, an optical holder 33, an optical processing unit 1034, and a thermal sheet 1035. The heat dissipation section is composed of, for example, a heat sink 1036. The base body 1030 may constitute the light source section, or it may constitute the heat dissipation section, or the light source section may be provided on the front side of the base body 1030 and the heat dissipation section on the back side of the base body 1030. The base body 1030 here has a support portion 1040 for which the light source unit 1003 is supported by the fixture body 1001. The following describes each part.

[0043] This will be explained primarily using Figures 12 and 13. (1) Base The base body 1030 has, for example, a low-height, bottomed cylindrical shape or a similar shape. The base body 1030 has a plate-like portion 1031 with a front surface on which the light source module 31 is arranged and a back surface on which the heat sink 1036 is arranged, and a cylindrical portion 1032 extending from the periphery of the plate-like portion 1031 to the back side. The base body 1030 is formed from, for example, a metal material (aluminum) or a resin material. The plate-shaped portion 1031 constitutes the base portion and has a screw hole 1031a into which a screw 329 for the light source holder 32 is screwed, and a screw hole (hole) 1031b for a screw 1369 for fixing the heat sink 1036. The cylindrical portion 1032 has a recessed portion 1032a for accommodating the supported portion 1040, and a screw hole 1032b formed in the recessed portion 1032a for a screw 1049 for fixing the supported portion 1040. When viewed from the front and back (see Figure 19), the base body 1030 has a shape that is close to an oval, with the center of a pair of straight sections of the oval protruding outwards, and the supported portion 1040 is provided on the protruding portion. In other words, the cylindrical portion 1032 has a pair of arc-shaped portions 1321 facing each other with the center in between, and straight portions 1322 and 1323, with a recessed portion 1032a between the straight portions 1322 and 1323. The straight portions 1322 and 1323 that sandwich the recessed portion 1032a in the circumferential direction are in the shape of a wide "V". The supported portion 1040 has a radially projecting protrusion 1041, which is supported by the support portion 1023 of the device body 1001. The protrusion 1041 corresponds to an example of the protrusion of Invention 2. The protruding body 1045 that constitutes the convex portion 1041 here functions as a power receiving terminal that receives power from the fixture body 1001 and supplies power to the light source module 31. For this reason, the base body 1030 has through holes 1032c and 1031c for wiring 1042 to electrically connect the power receiving terminal and the light source module 31. The through hole 1031b is provided in the plate-shaped portion 1031, and the through hole 1032c is provided in the recessed portion 1032a of the cylindrical portion 1032. Note that since the convex portion 1041 has a power receiving terminal, it may also be referred to as the power receiving terminal 41.

[0044] (2) Light source module, light source holder, optical holder The light source module 31, light source holder 32, and optical holder 33 have the same configuration as in the first embodiment, and their description will be omitted.

[0045] (3) Optical processing unit The optical processing unit 1034 focuses light from the light source module 31, for example. Here, it is composed of a lens body that is cone-shaped with a widening front side and has a recess 1034a on the light source module 31 side. The optical processing unit 1034 is detachably mounted to the optical holder 33 by a locking portion 332 on the front side of the optical holder 33, with an overhang portion 1034b extending radially outward from its front end fitting into a stepped portion 331 on the front side of the inner circumferential surface of the optical holder 33.

[0046] (4) Supported part This will be explained using Figure 14. The supported portion 1040 comprises a block-shaped holder 1043 and a projection 1045 having a convex portion 1041 that protrudes radially outward from the holder 1043. The projection 1045 is made of a conductive material and functions as a power receiving terminal.

[0047] The retainer 1043 is configured to fit into the recess 1034a of the base body 1030 from the radially outward direction. The retainer 1043 is made of an insulating material. The retainer 1043 has a through hole 1043b in the recess 1043a for fixing the retainer 1043 to the base body 1030. The holder 1043 has a through hole 1043c for the projection 1045. The holder 1043 is pin-shaped. Specifically, a GX type (GX53) that functions as a base for lamps, etc., can be used. The projection 1041 has a small diameter portion 1411 and a large diameter portion 1412 in the longitudinal direction. The projection 1041 of the projection 1045 corresponds to an example of a power receiving terminal of Invention 2. The projection 1045 has a protrusion 1041 on one side (the tip side) of its longitudinal direction that protrudes from the holder 1043, and the other side is inserted into and fixed in the through hole 1043c of the holder 1043. The wiring 1042 is connected by inserting its end 1042a from the through hole 1043c into the through hole of the projection 1045. The protrusion 1041 is supported by the light source support portion 1023 of the fixture body 1001. Therefore, it can be attached to the fixture body 1001 in a simple structure and electrically connected.

[0048] (5) Heat sink This will be explained using Figures 12 and 13. The heat sink 1036 is composed of heat dissipation fins formed by bending thin metal plates. The heat sink 1036 has U-shaped heat dissipation fins 1361 and 1362 attached to the base plate portion 1363, either integrally or separately, when viewed from the back side in the front-back direction. The heat dissipation fin 1361 has a pair of side portions 1361a and 1361b, and a connecting portion 1361c that connects the ends of the side portions 1361a and 1361b. The heat dissipation fin 1362 has a pair of side portions 1362a and 1362b, and a connecting portion 1362c that connects the ends of the side portions 1362a and 1362b. The heat dissipation fins 1361 and 1362 are arranged so that their edges overlap each other. That is, the edge 1361b of heat dissipation fin 1361 is located between the pair of edges 1362a and 1362b of heat dissipation fin 1362, and the edge 1362b of heat dissipation fin 1362 is located between the pair of edges 1361a and 1361b of heat dissipation fin 1361. This allows a large number of heat dissipation fins 1361 and 1362 to be provided on the base body 1030. The edges 1361a of the heat dissipation fin 1361 and 1362a of the heat dissipation fin 1362 are longer in the front-to-back direction than the other edges 1361b, 1362b and connecting parts 1361c, 1362c, and the front ends of the edges 1361a and 1362a connect to the ends of the rectangular base plate portion 1363 that are aligned along the longitudinal direction. The base plate portion 1363 has through holes for screws 1369 that fix the heat sink 1036 to the base body 1030.

[0049] 3. Reflector The reflector 5 has the same configuration as in the first embodiment, and its description will be omitted.

[0050] 4. Main body of the device Let's explain using Figure 11. The fixture body 1001 comprises at least a frame 1010 and a light source support part 1023. In this configuration, the main body of the device 1001 includes a mounting spring 21 and a reflector support part 22 attached to the frame 1010. The frame 1010 comprises a back frame 1013 positioned on the back side, a front frame 1014 positioned on the front side, and a connecting body 1015 that connects the back frame 1013 and the front frame 1014 in the front-back direction. In this case, there are two connecting bodies 1015 spaced apart in the circumferential direction. The front frame 1014 corresponds to an example of the first frame of Invention 2, and the back frame 1013 corresponds to an example of the second frame of Invention 2. The light source support section 1023 supports the protruding portion 1041, which is the supported portion 1040 of the light source unit 1003, and also has a power supply function that supplies power to the power receiving terminal 1041. Specifically, the light source support section 1023 is equipped with a conductive piece 1025 as a power supply terminal to which it is connected. The conductive piece 1025 of the light source support 1023 constitutes a spring for fixing the light source unit 1003 in its mounted state. The conductive piece 1025 also has the function of restricting the movement of the light source unit 103.

[0051] (1) Back frame This will be explained primarily using Figure 15. The back frame 1013 is semi-annular in shape overall and is connected to a pair of connecting members 1015. The back frame 1013 comprises a semi-annular plate-shaped semi-annular portion 1131 and a semi-cylindrical portion 1132 that extends from the outer peripheral edge of the semi-annular portion 1131 to the back side in the front-to-back direction. As a result, the semi-cylindrical portion 1132 reinforces the semi-annular portion 1131. The semi-annular portion 1131 has a through hole 1131a for a screw 1159 that secures the connecting body 1015. The through hole 1131a is formed in a part opposite to or close to the central axis. The semi-annular portion 1131 has a notch 1131b for wiring 1019 that connects to the light source support portion 1023 (power supply terminal). The wiring 1019 is located on the back surface of the semi-annular portion 1131, in a part close to the semi-cylindrical portion 1132 (see Figure 11(a)).

[0052] (2)Table frame The front frame 1014 includes an annular portion 1141 that covers the opening edge of the installation hole on the installation surface (which is the ceiling surface, etc.) from the front side, and a cylindrical portion 1142 that extends from the inner peripheral edge of the annular portion 1141 to the back side in the front-back direction. The annular portion 1141 has a stepped portion 1141a on its inner circumference side into which the extended portion 512 of the reflector 5 is fitted (see Figure 11(b)). The cylindrical portion 1142 has a through hole 1142a for fixing the connecting body 1015 with a rivet 1158 and a through hole 1142b for fixing the reflector support portion 22 with a rivet 229.

[0053] (3) Connector The connecting body 1015 is constructed by bending a metal plate. The connecting body 1015 has a rectangular main body portion 1151 that is long in the front-to-back direction, lateral bent portions 1152 and 1153 that bend radially inward from both ends of the main body portion 1151 in the short direction, and an upper bent portion 1154 that bends toward the central axis from the back end in the longitudinal direction of the main body portion 1151. The main body 1151 has a through hole 1151a for the mounting spring 21 and a through hole for the rivet 1158 for fixing the connecting body 1015 to the front frame 1014. Of the pair of lateral bent portions 1152 and 1153, one lateral bent portion 1152 is longer in the circumferential direction than the other lateral bent portion 1153, and has a through hole 1152a for fitting the light source support portion 1023 from the radially outward direction, and a screw hole 1152b or through hole for a screw 1029 or rivet for fixing the light source support portion 1023 to the lateral bent portion 1152. The upper bent portion 1154 has a screw hole for a screw 1159 that fixes the connecting body 1015 to the back frame 1013.

[0054] (4) Light source support part (4-1) Overview The light source unit 1003 is inserted into the frame 1010 of the fixture body 1001 from the front side, then mounted to the fixture body 1001 by rotating it in the circumferential mounting direction, and removed by rotating it in the circumferential removal direction and pulling it out to the front side while mounted. As shown in Figure 15, the light source support portion 1023 has a guide portion 1231 that guides the protrusion 1041 of the light source unit 1003 in the front-to-back direction, and a support portion 1232 that extends circumferentially from the guide portion 1231. The guide portion 1231 and the support portion 1232 correspond to examples of the guide portion and support portion of Invention 1.

[0055] For the sake of explanation, as shown in Figures 16 and 17, when viewing the light source support part 1023 from the central axis, the direction in which the protrusion 1041 moves when attaching or detaching the light source unit 1003 is defined as the "circumferential direction," the side to which the protrusion 1041 moves when attached is defined as the "attachment side," and the side to which the protrusion 1041 moves when removed is defined as the "detachment side." This will be explained primarily using Figure 16. The light source support section 1023 includes a conductive piece 1025 that has the function of supplying power to the light source unit 1003 by contacting the power receiving terminal 1041 of the light source unit 1003, a case 1026 that houses the conductive piece 1025, and a base plate 1027 on which the case 1026 is mounted. The light source support section 1023 is fixed to the connecting body 1015 by screwing a screw 1029 through the base plate 1027 and the through hole 1152a of the connecting body 1015, with the case 1026 fitted into the through hole 1152a of the connecting body 1015. The power receiving terminal 1041 corresponds to an example of a power supply terminal according to Invention 2.

[0056] (4-2) Case This will be explained primarily using Figures 16 and 17. The case 1026 has a plate-like portion 1261 that faces the base plate 1027 and has a rectangular, square, or similar shape, and a periphery plate portion that extends from the periphery of the plate-like portion 1261 toward the base plate 1027. The periphery plate portion has a detachment plate portion 1262 that extends in the front-back direction and is located on the detachment side, an attachment plate portion 1263 that extends in the front-back direction and is located on the attachment side, a back-side plate portion 1264 that extends in a direction perpendicular to the front-back direction (circumferential direction) and is located on the back side, and a front-side plate portion 1265 that extends in a direction perpendicular to the front-back direction (circumferential direction) and is located on the front side. The plate-shaped portion 1261 has a groove 1261a formed to match the trajectory along which the protrusion 1041 moves when the light source unit 1003 is attached or detached. The groove 1261a extends from the detachment side to the attachment side in the circumferential direction. On the detachment side of the groove 1261a, the groove width (dimension in the front-back direction) is larger than on the attachment side. This makes it easier to receive the protrusion 1041 of the light source unit 1003. The detachable side plate portion 1262 has a notched portion 1262a in the area facing the protrusion 1041. The notched portion 1262a and the groove 1261a allow the protrusion 1041 to be inserted into and removed from the case 1026. The rear panel portion 1264 has a through hole 1264a for introducing wiring 1019, which connects to the power supply unit (not shown) on the installation side, into the case 1026. The case 1026 has a support portion 1266 that supports the conductive piece 1025, which is positioned in contact with the back plate portion 1264 and the attachment plate portion 1263. The support portion 1266 here is composed of a groove into which the end of the fourth portion 1254 of the conductive piece 1025 fits, and is formed on the inner surface of the front (lower) portion of the notched portion 1262a in the detachable plate portion 1262. Case 1026 has a through hole 1267a for a screw 1029 in the bottom portion 1267 of a recess formed on the front side in the front-back direction and the circumferentially detached side.

[0057] (4-3) Conductive piece The conductive piece 1025 is constructed by bending and curving a metal plate. The conductive piece 1025 integrally includes a first portion 1251 that abuts against the back plate portion 1264 and the attachment plate portion 1263, a second portion 1252 that extends from the front end (lower end) of the first portion 1251 toward the front side and also toward the circumferential detachment side, a third portion 1253 that curves outwards toward the back side from the front end of the second portion 1252, and a fourth portion 1254 that bends toward the front side from the detachment end of the third portion 1253 and is supported by the support portion 1266 of the case 1026 (inserted into the groove). The conductive piece 1025 integrally includes a fifth portion 1255 that is folded back toward the front side from the detachment end of the first portion 1251 and toward the attachment side. The first part 1251 is, for example, L-shaped. The second part 1252 is, for example, L-shaped with a large angle and contacts the large-diameter portion 1412 (see Figure 14) of the supported protrusion 1041 at two points. This allows for electrical connection with the protrusion (power receiving terminal) 1041. The third part 1253 is mountain-shaped, and the distance between it and the internal region 1272a of the first extension portion 1272 of the base plate 1027 is smaller than the size of the large-diameter portion 1412 of the protrusion 1041. The conductive piece 1025 is configured to be elastically deformable so that the third part 1253 moves to the front side as the large-diameter portion 1412 of the protrusion 1041 passes circumferentially. In other words, at least the second portion 1252 and the third portion 1253 constitute a spring portion that allows the passage of the large-diameter portion 1412 of the protrusion 1041 by elastically deforming upon contact with the large-diameter portion 1412 of the protrusion 1041 on a path in which the protrusion 1041 moves circumferentially from the back end side (other end side) in the front-back direction (cylindrical axis direction) of the guide portion 1231. Note that the spring portion corresponds to an example of the spring portion of Invention 1. The wiring 1019 is connected to the conductive piece 1025 using the hole portion 1251a of the first portion 1251 of the conductive piece 1025, which is the portion that runs along the back plate portion 1264.

[0058] (4-4) Base plate The base plate 1027 has a plate-like portion 1271 that is square, rectangular, or similar in shape. The base plate 1027 includes a first extended portion 1272 that extends rib-like from the front side of the fifth portion 1255 of the conductive piece 1025 toward the circumferential side, and a second extended portion 1273 that is formed toward the circumferential side and extends in the front-back direction. The base plate 1027 has a convex portion 1272c on the first extended portion 1272 that abuts against the front side of the fifth portion 1255 of the conductive piece 1025 housed in the case 1026. The convex portion 1272c constitutes part of the function of holding the conductive piece 1025. The first extension 1272 has an internal region 1272a located inside the case 1026 and an external region 1272b located outside the case 1026, which are continuous along the circumferential direction. The internal region 1272a extends parallel or substantially parallel to the circumferential direction. The internal region 1272a is located on the back side of the groove 1261a of the case 1026. The external region 1272b extends from the notched portion 1262a of the case 1026 and is inclined toward the back side (upper side) in the front-back direction as it moves away from the notched portion 1262a in the circumferential direction. The second extension portion 1273 extends opposite the front (lower) portion of the notched portion 1262a in the front-to-back direction of the detached side plate portion 1262 of the case 1026. The second extension portion 1273 is located on the outside of the case 1026. The back end of the second extension portion 1273 is located on the back side in the front-to-back direction of the notched portion 1262a of the detached side plate portion 1262 of the case 1026 (the back end of the lower portion of the notched portion 1262a). Furthermore, the back end is located on the front side in the front-to-back direction of the third portion 1253 of the conductive piece 1025 inside the case 1026. The second extension portion 1273 is inclined to move away from the case 1026 as it moves from the back end to the front end. In other words, when the light source unit 1003 is attached to the fixture body 1001, the second extension portion 1273 is inclined such that the back side of the second extension portion 1273 is wider than the front side in the path through which it is inserted into the frame 1010 and moved to the back side. To put it another way, the second extension portion 1273 is inclined to move closer to the notched portion 1262a of the case 1026 as it moves towards the back side. The base plate 1027 has an engaged portion (hole) 1274 into which the engaging portion (protrusion) 1264b of the back plate portion 1264 of the case 1026 engages, an engaged portion (hole) 1275 into which the engaging portion (protrusion) 1265a of the front plate portion 1265 engages, an engaging portion 1276 into which the through hole 1152a (see Figure 15) of the connecting body 1015 engages, and a through hole through which the fixing screw 1029 is inserted.

[0059] (4-5) Guide section and support section This will be explained using Figures 18 and 17(a). The guide portion 1231 is composed of a plate-shaped portion 1271 of the base plate 1027, an external region 1272b of the first extended portion 1272 of the base plate 1027, and a second extended portion 1273. When the light source unit 1003 is rotated in the circumferential mounting direction while the protrusion 1041 of the light source unit 1003 is in contact with the first extension 1272 of the guide portion 1231, the protrusion 1041 moves in the mounting direction. At this time, the large-diameter portion 1412 of the protrusion 1041 moves to the second portion 1252 (mounting position) while in contact with the third portion 1253 of the conductive piece 1025 and the internal region 1272a of the first extension 1272 within the case 1026, and the small-diameter portion 1411 also moves within the groove 1261a of the case 1026. Thus, the support portion 1232 is composed of at least a second portion 1252 and a third portion 1253 of the conductive piece 1052.

[0060] 5. Attaching the light source unit to the fixture body. (1) Positional relationship (incorrect insertion) This will be explained using Figure 19. As shown in Figure 19(a), the pair of protrusions 1041 of the light source unit 1003 are positioned as not point-symmetric with respect to the center of the light source unit 1003. In other words, the imaginary line 1L5, which is an extension of the center line of one protrusion 1041 (projection 1045), and the imaginary line 1L6, which is an extension of the center line of the other protrusion 1041 (projection 1045), do not coincide, and the angle between them is "A". As shown in Figure 19(b), the pair of light source support parts 1023 of the fixture body 1001 are positioned as not point-symmetric with respect to the center O2 of the fixture body 1001. In other words, the imaginary line 1L7 that passes through one light source support part 1023 (referred to here to the back end in the front-to-back direction of the second extension part 1273) and also passes through the center O2 does not coincide with the imaginary line 1L8 that passes through the other light source support part 1023 (again, referencing the back end in the front-to-back direction of the second extension part 1273) and also passes through the center O2, and the angle between them is "A". This ensures that the light source unit 1003 can only be attached to the fixture body 1001 if the position of the protrusion 1041 of the light source unit 1003 coincides with the position of the corresponding light source support portion 1023 of the fixture body 1001. In other words, it prevents incorrect insertion of the light source unit 1003. In other words, because the positions of the pair of protrusions 1041 are shifted by an angle "A", the protrusions 1041 are guided to the fixed position shown in Figure 18(b) only when inserted into the corresponding light source support portion 1023, and are not guided to the fixed position shown in Figure 18(b) when inserted into a light source support portion 1023 that does not face the protrusions 1041. Therefore, it is possible to prevent incorrect insertion of the light source unit 1003. Furthermore, considering the weight balance, angle "A" is preferably 5 to 11°, more preferably 6 to 10°.

[0061] (2) Operation This will be explained primarily using Figures 17(a), 18, and 20. The operation of attaching the light source unit 1003 to the fixture body 1 will be described below. (a) The wiring 1019 connected to the power supply unit in the ceiling space is led out from the installation hole in the ceiling of the installation surface and connected to the conductive piece 1025 of the light source support part 1023 of the fixture body 1001. (b) Insert the fixture body 1001 through the installation hole and use the mounting spring 21 to attach the inserted fixture body 1001 to the ceiling. (c) Insert the light source unit 1003 into the frame 1010 of the fixture body 1001. Specifically, hold the base body 1030 of the light source unit 1003 and align the protrusion 1041 of the light source unit 1003 with the guide portion 1231 of the light source support portion 1023 of the fixture body 1001, and push it upward in the front-to-back direction toward the back. At this time, the protrusion 1041 moves along the guide portion 1231, in particular the second extension portion 1273. (d) Push up the light source unit 1003 until it contacts the rear side of the guide portion 1231, that is, the first extension portion 1272. This state is shown in Figures 18(a) and 20(a). While in the raised position, the light source unit 1003 is rotated in the circumferential direction along the first extension portion 1272 with respect to the central axis of the fixture body 1001. (e) During rotation, the gap between the third portion 1253 and the first extended portion 1272 of the conductive piece 1025 of the fixture body 1001 narrows, making it difficult to rotate the light source unit 1003. However, if the light source unit 1003 is continued to rotate in the direction of attachment, the conductive piece 1025 elastically deforms, allowing rotation in the direction of attachment, and the large diameter portion 1412 of the convex portion 1041 is inserted into the second portion 1252 of the conductive piece 1025 of the light source support portion 1023. This state is shown in Figures 18(b) and 20(b). (f) This completes the attachment of the light source unit 1003 to the fixture body 1001. To remove the light source unit 1003, simply reverse the installation process described above, that is, perform steps (f) through (a) in order.

[0062] (3) Structure (3-1) Light source unit The base body 1030 of the light source unit 1003 is the heaviest component of the light source unit 1003, and as shown in Figure 19(a), its outer circumference is approximately symmetrical with respect to a virtual line (not shown) connecting a pair of protrusions 1041. As a result, the light source unit 1003 is supported at two points, but is supported in a well-balanced manner. As shown in Figure 19(a), the base body 1030 is positioned so as not to protrude radially outward from the imaginary line 1L1, which is an extension of the arc of the arc-shaped portion 1321 of the cylindrical portion 1032 of the base body 1030. This makes it possible to reduce the dimension in the direction of the imaginary line connecting the pair of protrusions 1041.

[0063] (3-2) Support part As shown in Figure 20, the light source support portion 1023 of the fixture body 1001 is located on or inside the line of the imaginary line 1L1 of the cylindrical portion 1032 of the light source unit 1003. This allows the fixture body 1001 to be made smaller.

[0064] (3-3) Frame and heat dissipation holder The protrusion 1041 of the light source unit 1003 has a small diameter portion 1411 and a large diameter portion 1412. The size of the groove 1261a in the case 1026 of the light source support portion 1023 of the fixture body 1001 is configured such that the large diameter portion 1412 of the protrusion 1041 cannot pass through in the radial direction (the thickness direction of the plate-shaped portion 1261 of the case 1026). As a result, when the protrusion 1041 of the light source unit 1003 enters the case 1026 from the outside in the circumferential direction, the large diameter portion 1412 of the protrusion 1041 will not come out of the groove 1261a even if the light source unit 1003 moves in the radial direction. The large-diameter portion 1412 of the protrusion 1041 is cylindrical, and the second portion 1252 of the conductive piece 1025 of the device body 1001 is L-shaped with a large angle, and each side constituting the L is straight. As a result, the large-diameter portion 1412 of the protrusion 1041, when it moves to the second portion 1252, comes into contact with the second portion 1252 at least two points, enabling a stable electrical connection. The large-diameter portion 1412 of the protrusion 1041 of the light source unit 1003 is cylindrical. The conductive piece 1025 of the fixture body 1001 has a third portion 1253 on the circumferential side relative to the second portion 1252. As a result, even if a load is applied to the light source unit 1003 that causes it to move in the circumferential direction, the third portion 1253 bulges outwards on the back side in a mountain shape, restricting movement in the direction of detachment, and preventing the light source unit 1003 from becoming detached from the fixture body 1001 due to shaking such as an earthquake.

[0065] When viewed from the back side in the front-to-back direction, the frame 1010 has a large "V" shape between the main body 1151 and the lateral bent portion 1152 of the connecting body 1015, as shown in Figure 20. When viewed from the back side in the front-to-back direction, the base body 1030 of the light source unit 1003 has a large "V" shape with the convex portion 1041 as its apex, as shown in Figure 20, and furthermore, the convex portion 1041 is located radially inward from the imaginary line 1L1 of the base body 1030. When the light source unit 1003 is inserted into the frame 1010 in the front-to-back direction (Figure 20(a)), the linear portions 1322 and 1323 on both sides of the convex portion 1041 in the circumferential direction face the connecting body 1015. When the light source unit 1003 is mounted on the fixture body 1001 (Figure 20(b)), the convex portion 1041 and the linear portion 1323 on the circumferential side of the convex portion 1041 face the main body portion 1151 of the connecting body 1015 of the fixture body 1001. In other words, the outer shape of the base body 1030 corresponds to the shape of the inner surface of the connecting body 1015 of the frame body 10. As a result, even if the light source unit 1003 is moved (rotated) in the circumferential direction, there is no risk of interference between the light source unit 1003 and the fixture body 1001.

[0066] (3-4) Others As shown in Figure 18, the surface of the first extension portion 1272 (the outer region 1272b) that constitutes the guide portion 1231 is an inclined surface that moves to the back side in the front-to-back direction as it moves away from the support portion 1232 (the groove 1261a of the case 1026) in the circumferential direction. This makes it easy for the protrusion 1041 to move toward the support portion 1232. Furthermore, the groove 1261a of case 1026 is configured such that the groove width in the front-back direction is reduced, as the back edge portion of the groove 1261a faces in the circumferential direction towards the attachment direction. This allows the convex portion 1041 to move easily to the support portion 1232.

[0067] <Third Embodiment> 1. Overall As shown in Figures 21 and 23, the lighting device Z comprises a mounting fixture 2001 that is attached to an installation location such as a ceiling, and a lighting fixture 2003 that is detachably attached to the mounting fixture 2001. Note that the same reference numerals are used for components that are the same as those in the first and second embodiments, and their descriptions are omitted. The lighting device Z is a so-called universal downlight type, and in the lighting fixture 2003, as shown in Figure 21, the light source unit 2031 is mounted on the first reflector 2032 via a mounting unit 2033 so that the tilt angle relative to the first reflector 2032 can be adjusted. The direction in which the pivot axis on which the light source unit 2031 rotates relative to the first reflector 2032 is defined as the pivot axis direction. In the specification, the description is based on the state shown in Figure 21(a), where the central axes of the light source unit 2031 and the first reflector 2032 are parallel to the vertical direction, and light is emitted downward from the light source unit 2031. The mounting fixture 2001 is installed by being inserted into, for example, an installation hole (not shown) in the ceiling, and the installed state is maintained by the mounting spring 2021. As shown in Figures 21 and 22, the lighting fixture 2003 comprises a first reflector 2032 mounted on a mounting fixture 2001, a mounting unit 2033 mounted on the first reflector 2032, a light source unit 2031 mounted on the mounting unit 2033, a second reflector 2034 mounted on the mounting unit 2033, and a third reflector 2035 (see Figure 22) mounted on the first reflector 2032. The third reflector 2035 corresponds to an example of the reflector of Invention 3, and the first reflector corresponds to an example of the reflector holder of Invention 3. The "circumferential direction" and "radial direction" are based on the vertical direction. Note that although the central axis of the mounting fixture 2001 and the central axis of the light source unit 2031 are parallel, they are offset in directions perpendicular to the vertical direction and the rotation axis direction, and therefore do not coincide. The following describes each part.

[0068] 2. Mounting fixtures This will be explained using Figures 23 and 24. The mounting device 2001 comprises a frame 2010 and a mounting spring 2021. The frame 2010 comprises an annular portion 2011 that covers the opening edge of the installation hole on the installation surface (such as a ceiling surface) from the front side, and a cylindrical portion 2012 that extends from the inner peripheral edge of the annular portion 2011 to the back side in the front-back direction. The frame 2010 is a so-called decorative frame. The mounting fixture 2001 has a stepped portion 2013 on its inner circumference side into which the protruding portion 2352 (see Figure 25) of the third reflector 2035 is fitted. The cylindrical portion 2012 has at least a through hole 2012a for securing the mounting spring 2021 with a rivet 2029.

[0069] The mounting fixture 2001 has a mounting portion 2014 on the cylindrical portion 1012 for detachably attaching the first reflector 2032. The mounting portion 2014 is provided in one or more units; in this case, three are provided at equal intervals (equal angles) in the circumferential direction. Considering the stability of the mounted first reflector 2032, three or more are preferable. The mounting portion 2014 includes a movable body 2141 supported so as to be movable in the radial direction, and a biasing means 2143 that biases the movable body 2141 radially inward (which is the circumferential groove portion 2321a described later). Here, the mounting portion 2014 includes a case 2145 that movably supports the movable body 2141 and houses the biasing means 2143. The mounting fixture 2001 corresponds to one example of the mounting fixture and lighting fixture of Invention 3, and the movable body 2141 and the biasing means 2143 correspond to an example of the first movable body and the first biasing means of Invention 3. The mounting portion 2014 is installed such that the case 2145 fits into the through hole of the cylindrical portion 2012. For example, a sphere is used as the movable body 2141, and a coil spring is used as the biasing means 2143. The mounting portion 2014 supports the first reflector 2032 by having the movable body 2141 abut from the radially outward direction against the circumferentially extending circumferential groove portion 2321a formed in the cylindrical portion 2321 of the first reflector 2032.

[0070] The mounting fixture 2001 has a position regulating part 2015 on the cylindrical part 1012 for adjusting and maintaining the rotation angle of the first reflector 2032 around its central axis. The position regulating section 2015 is provided in one or more units, and in this case, one unit is provided. The position regulating unit 2015 comprises a movable body 2151 supported to be movably supported in the radial direction, and a biasing means 2153 that biases the movable body 2151 radially inward. Here, the position regulating unit 2015 comprises a case 2155 that movably supports the movable body 2151 and houses the biasing means 2153. The mounting fixture 2001 corresponds to one example of the mounting fixture and lighting fixture of Invention 3, and the movable body 2151 and biasing means 2153 correspond to an example of the second movable body and second biasing means of Invention 3. The position regulating section 2015 is installed such that the case 2155 fits into the through hole of the cylindrical section 2012. For example, a sphere is used as the movable body 2151, and a coil spring is used as the biasing means 2153. The position regulating unit 2015 adjusts and maintains the circumferential rotation angle of the first reflector 2032 by having the movable body 2151 contact one of the multiple vertical grooves 2321b that extend vertically and are formed in the cylindrical portion 2321 of the first reflector 2032 from the radially outward direction.

[0071] The multiple (3) mounting sections 2014 are located on the lower side, and the position regulating section 2015 is located above the mounting sections 2014. The position of the position regulating section 2015 is not particularly limited, but in this case, it is located above one of the three mounting sections 2014. The primary function of the position regulating unit 2015 is to adjust the circumferential angle of the first reflector 2032 relative to the mounting fixture 2001, and to maintain that state (angle). For this reason, the biasing force of the biasing means 2153 of the position regulating unit 2015 is smaller than the biasing force of the biasing means 2143 of the mounting unit 2014. The main function of the mounting portion 2014 is to attach the first reflector 2032 to the mounting fixture 2001, and it is preferable that the contact area between the movable body 2141 and the circumferential groove portion 2321a of the mounting fixture 2001 be large. For this reason, the size (diameter) of the movable body 2141 of the mounting portion 2014 is larger than that of the movable body 2151 of the position regulating portion 2015. The position regulating portion 2015 is positioned closer to the central axis than the mounting portion 2014. Specifically, the cylindrical portion 2012 on which the position regulating portion 2015 is located has a large wall thickness, and the inner circumferential surface on which the position regulating portion 2015 is located is radially inward from the inner circumferential surface on which the mounting portion 2014 is located. This makes it possible to reduce the radial size of the position regulating portion 2015.

[0072] 3. Lighting fixtures (1) Overview As shown in Figure 25, the lighting fixture 2003 comprises a light source unit 2031, a unit body 2037 in which a mounting unit 2033 with a second reflector 2034 is mounted on the first reflector 2032, and a third reflector 2035. The individual parts will be described below.

[0073] (2) Light source unit This will be explained primarily using Figure 26. The light source unit 2031 comprises at least a base plate 30, a light source module 31 (see Figure 22), and heat sinks consisting of heat sink fins 36 and heat sink columns 37. In this light source unit 2031, in addition to the base plate 30, light source module 31, heat dissipation fins 36, and heat dissipation column 37, a heat dissipation cover 2311 that covers the heat dissipation fins 36 and heat dissipation column 37 from above, a light source holder 32, an optical processing body 1034 (see Figure 22), an optical cover 2312 for protecting the optical processing body 1034, an optical holder 33, a cover 2313 that covers the front side of the base plate 30, and a heat dissipation holder 38. The light source unit is composed of, for example, a light source module 31, a light source holder 32, an optical holder 33, an optical processing unit 1034, an optical cover 2312, and a cover 2313. The heat dissipation section is composed of, for example, heat dissipation fins 36, heat dissipation columns 37, and heat dissipation holders 38, and has a supported portion 39 for which the light source unit 2031 is supported by the mounting unit 2033. The base plate 30 may constitute a light source, or a heat dissipation section, or the light source may be provided on the front side of the base plate 30 and the heat dissipation section on the back side of the base plate 30. The following describes each part.

[0074] The base plate 30, light source module 31, light source holder 32, optical holder 33, heat dissipation fins 36, heat dissipation column 37, and heat dissipation holder 38 have the same configuration as in the first embodiment, and the optical processing unit 1034 has the same configuration as in the second embodiment, so their descriptions are omitted. As shown in Figure 26, the heat dissipation cover 2311 is cylindrical with a lid, and one or more through holes 2311b are provided in the top wall portion 2311a for air that has exchanged heat with the heat dissipation fins 36 and heat dissipation columns 37 to pass through. In this case, there are multiple through holes 2311b, which are formed at intervals in the circumferential direction around the central axis. The multiple through holes 2311b are formed to extend radially outward from the center and to move circumferentially away from a virtual line that passes through the center and extends radially as one moves away from the center. The through holes 2311b are formed so that the circumferential opening increases as one moves away from the center. The heat dissipation cover 2311 is fixed to the heat dissipation columns 37 by screws 2319, covering the heat dissipation fins 36 and the heat dissipation columns 37 so as to house the heat dissipation fins 36 inside.

[0075] The optical cover 2312 is a circular plate and is made of a light-transmitting material. The optical cover 2312 is supported by the flange portion 2313f of the cover 2313. The cover 2313 has a cylindrical portion 2313a and an overhang portion 2313b that extends radially from the back end of the cylindrical portion 2313a. The cylindrical portion 2313a has a large diameter portion 2313c and a small diameter portion 2313d on its front and back sides. The cylindrical portion 2313a covers the light source module 31, the light source holder 32, the optical holder 33, the optical processing unit 1034, and the optical cover 2312, with the large diameter portion 2313c being the part where the screws 389 for the heat dissipation holder 38 are located. With the locking portion 2313e of the overhang portion 2313b fitted into the groove 30f of the base plate 30, the cover 2313 is rotated around its central axis, causing the engaging portion 231e to engage with the engaged portion 30g of the base plate 30, and in this state, it is fixed to the base plate 30 by screws 2316. The screw 2316 is screwed into the screw hole 30h of the base plate 30.

[0076] (3) Mounting Unit The mounting unit 2033 has, for example, a frame 2330 which is constructed by curving or bending a metal plate. The frame 2330 integrally comprises opposing parts 2331, 2331 that face each other across the central axis, upper extension parts 2332, 2333 that extend upward from the circumferential central portion of the opposing parts 2331, 2331, connecting parts 2334, 2334 that are at the upper ends of the opposing parts 2331, 2331 and connect both sides of the upper extension parts 2332, 2333, lower extension parts 2335, 2335 that extend downward from the lower ends of the opposing parts 2331, 2331, and bent parts 2336, 2336 that bend toward the central axis from the middle of the extension of the lower extension parts 2335, 2335. Furthermore, the upper extensions 2332 and 2333, the opposing portion 2331, and the lower extension 2335 are located on the same plane. This allows for low-cost implementation.

[0077] Of the pair of upward extensions 2332 and 2333, one upward extension 2332 has a through hole 2332a into which the convex portion, which is the supported portion 39 of the light source unit 2031, is inserted from the radially inner side, and the other upward extension 2333 has a notched portion 2333a that is open at the top and into which the supported portion 39 of the light source unit 2031 is inserted from above. The opposing portion 2331, which is continuous with the upper extension portion 2333, is provided with a holding portion 2360 that holds the supported portion 39 inserted into the notched portion 2333a. The holding portion 2360 integrally includes a spring portion 2361 that elastically deforms radially outward when it comes into contact with the supported portion 39 moving up and down within the notched portion 233a, and a fixing portion 2362 that is fixed to the outer surface of the opposing portion 2331 by a rivet 2369. Furthermore, with one supported portion 39 of the light source unit 2031 inserted into the through hole 2332a of the upward extension portion 2332, the other supported portion 39 is inserted from above into the notched portion 233a of the upward extension portion 2333, causing the spring portion 2361 to elastically deform and be supported by the pair of upward extension portions 2332 and 2333.

[0078] The connecting portion 2334 connects the pair of opposing portions 2331 in such a way that it bulges radially outward in an arc shape from the opposing portions 2331. As a result, when viewed from above, a circular space is formed inside the opposing portions 2331, 2331 and the connecting portion 2334, 2334. The mounted light source unit 2031 is placed in this space.

[0079] A pair of downward extensions 2335, facing each other across the central axis, have through holes at their lower ends. A screw 2531, inserted through this through hole, passes through the through hole 2322d of the first reflector 2032 and is screwed into a nut 2532. This fixes the light source unit 2031 so that it can rotate relative to the first reflector 2032. The central axes of the two screws 2531 are located on the same line, the extension of this central axis is the axis of rotation, and its extension direction is the axis of rotation. The bent portion 2336 has a threaded hole or through hole for the screw 2533. The screw 2553 secures the second reflector 2034 to the bent portion 2336.

[0080] (4) Second reflector The second reflector 2034 has the function of preventing light emitted from the light source unit 2031 from leaking between the light source unit 2031 and the first reflector 2032. The second reflector 2034 is mounted on the mounting unit 2033, to which the light source unit 2031 is attached. Therefore, the positional relationship between the second reflector 2034 and the light source unit 2031 remains constant even when the mounting unit 2033 rotates relative to the first reflector 2032. This simplifies the optical design. The second reflector 2034 has an upper cylindrical portion 2341 into which the lower side of the cover 2313 of the light source unit 2031 is inserted (see Figure 22), a lower cylindrical portion 2342 located below the upper cylindrical portion 2341 and having an opening diameter that increases as it moves downward, and a pair of plate-like portions 2343 formed to be continuous with the upper cylindrical portion 2341 and the lower cylindrical portion 2342. The inner surfaces of the upper cylinder portion 2341 and the lower cylinder portion 2342 are reflective surfaces. The plate-like portion 2343 protrudes radially outward and extends vertically. The plate-like portion 2343 has a screw hole 2343a for a screw 2533 that passes through the through hole of the bent portion 2336.

[0081] (5) First reflector The first reflector 2032 is rotatably connected to the mounting unit 2033. Here, the direction in which it is connected by the mounting unit 2033 coincides with the direction of rotation. The first reflector 2032 integrally comprises a cylindrical portion 2321, fixing portions 2322, 2322 provided at the upper end of the cylindrical portion 2321 and opposite each other across the central axis, a dome portion 2323 provided on one side in a direction perpendicular to the imaginary line (which is the rotation axis direction) connecting the pair of fixing portions 2322, 2322, a semi-cylindrical portion 2324 provided on the other side in a direction perpendicular to the imaginary line, and a mounting portion 2325 provided on the inner circumferential surface of the cylindrical portion 2321 and below the fixing portion 2322.

[0082] The cylindrical portion 2321 has a circumferential groove portion 2321a into which the movable body 2141 of the mounting portion 2014 of the mounting fixture 2001 is fitted from the radially outward direction. The circumferential groove portion 2321a is formed continuously over the entire circumference in the circumferential direction. The depth of the circumferential groove portion 2321a is about half the diameter of the spherical movable body 2141 of the mounting portion 2014. The lighting fixture 2003 corresponds to the other example of the mounting fixture and lighting fixture of Invention 3, and the circumferential groove portion 2321a corresponds to an example of the first groove portion of Invention 3. The cylindrical portion 2321 has a vertical groove portion 2321b into which the movable body 2151 of the position regulating portion 2015 of the mounting fixture 2001 is fitted from the radially outward direction. The vertical groove portion 2321b extends in the vertical direction and is formed in multiples at intervals in the entire or partial circumferential region. The lighting fixture 2003 corresponds to an example of the other of the mounting fixture and lighting fixture of Invention 3, and the vertical groove portion 2321b corresponds to an example of the second groove portion of Invention 3. The depth of the vertical groove 2321b is approximately half the diameter of the spherical movable body 2151 of the position regulating part 2015. The smaller the pitch of the vertical groove 2321b, the smaller the angle adjustment of the first reflector 2032 relative to the mounting fixture 2001. A pitch of 5 to 10 mm is preferred for the vertical groove 2321b. Furthermore, the vertical length of the vertical groove 2321b is approximately three times the diameter of the spherical movable body 2151 of the position regulating part 2015.

[0083] As shown in Figure 29, the cylindrical portion 2321 has a stepped portion 2321e along its central axis, and via this stepped portion 2321e, it has a large-diameter portion 2321f on the lower side and a small-diameter portion 2321g on the upper side. The circumferential groove 2321a is located below the longitudinal groove 2321b. Specifically, the circumferential groove 2321a is located in the large-diameter portion 2321f, and the longitudinal groove 2321b is located in the small-diameter portion 2325g. As a result, when processing the first reflector 2032 with a mold, the longitudinal groove 2321b, which has multiple grooves formed along the exit direction (upward direction) of the first reflector 2032, is formed in the exit direction (upward direction) of the first reflector 2032 relative to the circumferential groove 2321a, making it easier to process the first reflector 2032. Furthermore, because a tapered stepped portion 2321e is provided on the upper side, the mounting portion 2014 is less likely to interfere with the first reflector 2032 when attaching or detaching the first reflector 2032 to the mounting fixture 2001. The first reflector 2032 is configured such that the large-diameter portion 2321f of the cylindrical portion 2321f is small in diameter in the portion of the cylindrical portion 2012 of the mounting fixture 2001 where the position regulating portion 2015 is provided, and therefore cannot pass from the front side to the back side of the mounting fixture 2001. Furthermore, the frame 2010 has multiple stepped sections 2013a on its inner circumferential surface, which move from the lower side towards the upper side and approach the central axis in stages (for example, three stages). The uppermost step is fitted to the protruding section 2321h, which is provided at the lower end of the first reflector 2032 and extends radially outward, and is opposed to the upper and lower sections. This allows the first reflector 2032 to rotate smoothly. The protruding section 2352 of the third reflector 2035 is fitted to the lowermost step section 2013 of the multiple stepped sections 2013a.

[0084] The cylindrical portion 2321 has one knob portion 2321c on its inner circumferential surface for adjusting the angle of the first reflector 2032 relative to the mounting fixture 2001. Multiple knob portions 2321c may be provided; for example, a pair may be provided at point-symmetrical or line-symmetrical positions with respect to the central axis of the cylindrical portion 2321.

[0085] The fixing portion 2322 has a plate portion 2322a perpendicular to the radial direction, a recess portion 2322b formed radially outward relative to the plate portion 2322a, and a groove portion 2322c formed radially inward relative to the plate portion 2322a. A through hole 2322d is formed in the plate portion 2322a through which the threaded portion of the screw 2531 is inserted. The recessed portion 2322b is formed so that its radially outer and upper sides are open. The lower extension portion 2335 of the mounting unit 2033 is inserted into the recessed portion 2322b from above. The upper side of the circumferentially opposing side of the recessed portion 2322b, which is the side on the semi-cylindrical portion 2324 side, is an inclined surface 2322e that widens circumferentially as it moves towards the upper end. The rotational range of the mounting unit 2033 is the range in which the lower extension portion 2335 abuts against the side of the recessed portion 2322b. From this viewpoint, the inclined surface 2322e functions as a restrictor for the rotational movement of the mounting unit 2033. The groove portion 2322c extends vertically and is open at the top. A screw 2531 for the mounting unit 2033 and a nut 2532 that screws into it are inserted into the groove portion 2322c. The width of the groove portion 2322c corresponds to the width of the nut 2532. This allows the screw 2531 and nut 2532 to be fastened using only the tool on the screw 2531 side.

[0086] The mounting portion 2325 has a groove 2325a into which a mounting device 2345 for mounting the third reflector 2035 is inserted, and a hole 2325b for fixing the mounting device 2345. The hole 2325b is formed in the bottom portion 2325c of the groove 2325a. The mounting device 2345 has at least a plate portion 2345a that is inserted from below into the groove portion 2325a of the mounting portion 2325, an engaging spring portion 2345b that engages with the engaged portion 2353 of the third reflector 2035, and an extending portion 2345c that extends downward from the plate portion 2345a and is inserted into the hole portion 2325b of the mounting portion 2325.

[0087] (6) Third reflector This will be explained using Figure 25. The third reflector 2035 has a main body portion 2351 that is cone-shaped with a circular cross-section and tapering towards the top, and an overhang portion 2352 that extends radially outward from the lower end of the main body portion 2351. The overhang portion 2352 fits into the stepped portion 2013 of the mounting fixture 2001. The inner surface of the main body 2351 is a reflective surface, which reflects the light emitted from the light source unit 2031 downwards. The third reflector 2035 is attached by the mounting fixture 2345 of the first reflector 2032. Specifically, the engaging portion 2353 of the third reflector 2035 is engaged by the engaging spring portion 2345b of the mounting fixture 2345 (see Figures 27 and 28), thereby providing support. Furthermore, the rib portion 2354 of the third reflector 2035 is fitted from the front side into the groove portion 2321d (see Figure 28) of the knob portion 2321c of the first reflector 2032. This restricts the rotation of the third reflector 2035 relative to the first reflector 2032 and prevents the engagement of the engaged portion 2353 from being released.

[0088] 4. Installation process This section explains how to install the lighting device. (a) Insert the mounting fixture 2001 into the installation hole from below, and use the mounting spring 2021 to attach the inserted mounting fixture 2001 to the ceiling. (b) Prepare a unit body 2037 consisting of a mounting unit 2033, a first reflector 2032, and a second reflector 2034. (c) After inserting one supported portion 39 of the light source unit 2031 into the through hole 2332a of the upper extension portion 2332 of the mounting unit 2033, the other supported portion 39 is pushed from above against the notched portion 2333a of the upper extension portion 2333 of the mounting unit 2033 until it is held in place by the holding portion 2360. This incorporates the light source unit 2031 into the unit body 2037. (d) After adjusting the vertical rotation angle of the light source unit 2031, that is, the rotation angle around the pivot axis, the screw 2531 is fastened to the nut 2532 to fix the angle of the light source unit 2031 relative to the first reflector 2032. (e) Connect the connector 2318 provided at the end of the wiring 2317 of the light source unit 2031 to the connector of the power supply unit on the ceiling side. (f) The unit body 2037 with the light source unit 2031 attached is pushed up from below into the mounting fixture 2001 until the movable body 2141 of the mounting portion 2014 of the mounting fixture 2001 fits into the circumferential groove 2321a of the first reflector 2032. This mounts the unit body 2037 with the light source unit 2031 attached to the mounting fixture 2001. (g) The knob 2321c of the first reflector 2032 is operated to rotate the first reflector 2032 with respect to the mounting fixture 2001, using the vertical direction as the axis of rotation, thereby adjusting the direction of illumination of the light source unit 2031. (h) The third reflector 2035 is attached to the first reflector 2032 by aligning the engaged portion 2353 with the mounting device 2345 of the first reflector 2032 and pushing it up from below.

[0089] <Fourth Embodiment> 1. Overall This will be explained using Figures 30 and 31. The lighting device W comprises at least a fixture body 3001 that is mounted on an installation site such as a ceiling, and a light source unit 3003 that is detachably attached to the fixture body 3001. Note that the same reference numerals may be used for components and functions that are the same as or similar to those in the first to third embodiments, and their descriptions may be omitted. The lighting device W is a so-called downlight type, and the fixture body 3001 is installed by being inserted into an installation hole (not shown) in the ceiling, for example, and the installed state is maintained by the mounting spring 3021. The fixture body 3001 as a whole is cylindrical with the direction in which the light source unit 3003 is inserted or removed as its central axis, with the direction in which this central axis extends being the central axis direction or the front-back direction, and the side from which light is emitted from the light source unit 3003 being the front side. In this embodiment, the front and back directions coincide with the direction in which the light source unit 3003 emits light and the up and down directions, and the front side may be described as the bottom side and the back side as the top side. Furthermore, the "circumferential direction" and "radial direction" are based on the central axis extending vertically from the fixture body 3001 and the light source unit 3003. The central axes of the fixture body 3001 and the light source unit 3003 coincide with or approximately coincide with the central axis of the lighting device W.

[0090] The fixture body 3001 includes at least a mounting portion for attaching the fixture body 3001 to an installation site, a support portion (which is also a light source support portion) for supporting the light source unit 3003, and a power supply portion for supplying power to the light source unit 3003. The light source unit 3003 includes a light source section (light source module 3031 and cover 3035) that emits light, a heat dissipation section (fin section 3303 of base body 3030) that releases heat from the light source section, a power receiving section (power receiving terminal 3045) that receives power from the fixture body 3001, a circuit section (lighting module 3042) for lighting the light source section, and a supported section 3039 that is supported by the fixture body 3001.

[0091] The light source unit 3003 is inserted into the fixture body 3001 from the front side, with its back side (the side with the lighting module 3042) facing forward. When rotated in one direction in the circumferential direction around the central axis (attachment direction), it is attached to the fixture body 3001. When rotated in the other direction in the circumferential direction from the attached state (detachment direction), it is detached from the fixture body 3001. The rotation direction when attaching and detaching the light source unit 3 is the same as in the first embodiment. As will be described later, when mounting the light source unit 3003, the direction (side) in which the supported portion 3039 enters the vertical groove 3131h is referred to as the downstream side, and when mounting the light source unit 3003, the direction (side) in which the power receiving terminal 3045 and the ground terminal 3046 enter the groove 3151b and the vertical groove 3182a is referred to as the downstream side. In addition, when removing the light source unit 3003, the direction (side) in which the supported portion 3039 exits from the lateral groove 3131i is referred to as the downstream side, and when removing the light source unit 3003, the direction (side) in which the power receiving terminal 3045 and the ground terminal 3046 exit from the lateral groove 3182b is also referred to as the downstream side. The following describes each part.

[0092] 2. Light source unit This will be explained using Figures 31 to 34. As shown in Figures 32 and 33, the light source unit 3003 comprises at least a base body 3030, a light source module 3031 disposed on the surface of the base body 3030, a cover 3035 that covers the light source module 3031 from the front, a power receiving terminal 3045 that receives power from the fixture body 3001, a ground terminal 3046 for grounding, and a lighting module 3042 disposed on the back side of the base body 3030. The base body 3030 here has a support portion 3039 for which the light source unit 3003 is supported by the fixture body 3001. The following describes each part.

[0093] (1) Base The base body 3030 has a structure that integrally includes a portion corresponding to the base body 1030 of the first embodiment and a portion corresponding to the heat sink 1036 of the first embodiment. The base body 3030 integrally includes a plate-shaped portion 3301 on which the light source module 3031 is arranged on the surface, and a fin portion 3303 that extends rearward from the back surface of the plate-shaped portion 3301. The plate-shaped portion 3301 is disc-shaped and is provided with screw holes for fixing the light source module 3031 and through holes 3301a for wiring that connects the light source module 3031 and the lighting module 3042. As shown in Figure 34, the fin portion 3303 has a cylindrical portion 3303a located in the center of the plate-shaped portion 3301, a first extended portion 3303b formed at a circumferential distance from the cylindrical portion 3303a and extending radially, and a second extended portion 3303c extending radially from between circumferentially adjacent first extended portions 3303b. The fin portion 3303 of the base body 3030 constitutes the heat dissipation section.

[0094] As shown in Figures 32 and 33, the base body 3030 has a plate-like portion 3301 with a support portion 3039 on its periphery, which is on the back surface. Multiple support portions 3039 are provided at intervals (equally spaced in this case) in the circumferential direction (for example, three). Each support portion 3039 has a convex portion 3039a that protrudes from the back side of the plate-like portion 3301, and an overhanging portion 3039b that extends radially outward from the outer circumferential surface of the convex portion 3039a. The overhanging portion 3039b is supported by engaging with the groove 3131g (see Figure 31) of the support portion 3023 of the fixture body 3001. The supported portion 3039 moves in conjunction with the power receiving terminal 3045 and the ground terminal 3046, described later, and with the movement of the light source unit 3003 (movement in the front-back direction and rotation around the central axis) when the light source unit 3003 is attached or detached. In other words, the light source unit 3003 is provided with multiple (for example, three) protruding portions (claw portions) 3039b in the circumferential direction that engage with the support portion 3023 (lateral groove 3131i) of the fixture body 3001 in conjunction with the movement of the power receiving terminal 3045 and the ground terminal 3046. As shown in Figure 34, the supported portion 3039 is located between the circumferentially adjacent second extended portions 3303c in relation to the fin portion 3303. In addition, the convex portion 3039a and the protruding portion 3039b, which are examples of the supported portion 3039, are provided integrally with the base body 3030 (so that they cannot be extended or retracted). However, for example, the protruding portion 3039b may be supported so that it can extend and retract radially outward, and biased radially outward by an elastic member so as to engage with the lateral groove 3131i, which is an example of the support portion 3023.

[0095] As shown in Figures 32 and 33, the base body 3030 has a fixing portion 3305 on the back surface and periphery of the plate-shaped portion 3301 for simultaneously fixing a support 3026 for supporting the power receiving terminal 3045 and the ground terminal 3046, and the cover 3035. The support 3026 has a so-called socket function. The fixing portion 3305 has a notched portion 3305a for the extended portion 3353 of the cover 3035, a first protruding portion 3305b having a screw hole for fixing the support 3026 with a screw 3991, and a second protruding portion 3305c for positioning the support 3026. Here, from the radially outer side, the notched portion 3305a, the first protruding portion 3305b, and the second protruding portion 3305c are located in that order. As shown in Figure 34, the power receiving terminal 3045, the ground terminal 3046, and the fixing part 3305 are located between adjacent second extension portions 3303c in the circumferential direction in relation to the fin portion 3303. Furthermore, the power receiving terminal 3045, the ground terminal 3046, and the fixing part 3305 are located between adjacent supported portions 3039 in the circumferential direction in relation to the supported portion 3039. Here, they are provided at equal intervals in the circumferential direction.

[0096] (2) Light source module The light source module 3031 consists of a disc-shaped substrate 3311 and multiple LEDs 3313 mounted on the substrate 3311, and is fixed to the base body 3030 by screws 3992.

[0097] (3) Cover The cover 3035 has a bottomed cylindrical main body 3351 and an extension portion 3353 that extends from the peripheral wall portion of the main body 3351 to the back side. The cover 3035 is attached when the extension portion 3353 fits into the notched portion 3305a of the base body 3030, and a screw 3991 that passes through the through hole 3353a of the extension portion 3353 is screwed into the screw hole of the first protruding portion 3305b of the base body 3030. The light source unit is composed of the light source module 3031 and the cover 3035.

[0098] (4) Terminals The power receiving terminal 3045 and the ground terminal 3046 are fixed to the base body 3030 via the support member 3026. In other words, the support member 3026 to which the power receiving terminal 3045 or the ground terminal 3046 is attached is fixed to the base body 3030. The support member 3026 has a main body 3261 with a U-shaped cross-section, and is provided with a through hole 3261a for allowing the tip of the power receiving terminal 3045 or the ground terminal 3046 to protrude radially outward from the main body 3261, a screw hole 3261b for a screw 3993 for fixing the power receiving terminal 3045 or the ground terminal 3046 to the main body 3261, and a through hole 3231c for a screw 3391 for fixing the cover 3035 (or its extended portion 3353) to the main body 3261. The power receiving terminal 3045 constitutes the power receiving section. The configuration of the ground terminal 3046 is the same as that of the power receiving terminal 3045, and it is supported by the support member 3026 with the same configuration. In addition, the ground terminal 3046 may be connected to wiring routed to a terminal block located within the lighting module 3042 (not shown).

[0099] (5) Lighting module The lighting module 3042 houses a lighting circuit (not shown) within a case 3421 and is attached to the back of the fin portion 3303 of the base body 3030, for example, by screws 3998. Case 3421 consists of a lower case 3423 and an upper case 3425. The lower case 3423 is fixed to the base body 3030 by screws 3998 protruding from the inside. After the circuit is installed in the lower case 3423, the upper case 3425 is fixed to the lower case 3423 by engagement structures, screws, etc. The lower case 3423 is provided with a plurality of protrusions 3423a for positioning the fin portion 3303 in the circumferential direction, and through holes 3423b for wiring that connect the light source module 3031 and the lighting module 3042. The circuit section is comprised of the lighting module 3042.

[0100] 3. Main body of the device This will be explained using Figures 35 to 38. As shown in Figure 35, the main body of the device 3001 comprises at least a cylindrical frame 3010, a mounting spring 3021, and a terminal block 3013 (see Figure 30). The frame 3010 is provided with a conductive piece 3025 that is electrically connected to the power receiving terminal 3045 or the ground terminal 3046 of the light source unit 3003, and a support portion 3023 that supports the light source unit 3003.

[0101] (1) Frame As shown in Figure 35, the frame 3010 includes a decorative frame 3014 on the front side, an intermediate frame 3015 positioned on the back side of the decorative frame 3014, a holder 3016 positioned on the back side of the intermediate frame 3015, and a fixing frame 3017 positioned on the back side of the holder 3016. The fixed frame 3017 is connected to the decorative frame 3014, sandwiching the intermediate frame 3015 and the holder 3016 from both sides. The frame body 3010 corresponds to an example of the cylindrical part of Invention 1. The following explanation will primarily use Figures 36 to 38.

[0102] (1-1) Decorative frame The decorative frame 3014 has a cylindrical portion 3141 and a flange portion 3143 that protrudes radially outward from the front end of the cylindrical portion 3141, and a mounting spring 3021 is fixed to the cylindrical portion 3141 by a screw 3994. The mounting portion is composed of the mounting spring 3021.

[0103] (1-2) Intermediate slot The intermediate frame 3015 has a cylindrical portion 3151, grooves 3131g and 3151b formed in the cylindrical portion 3151, a recessed portion 3153 formed on the back end of the cylindrical portion 3151, a protruding portion 3155 formed on the back end of the cylindrical portion 3151, and a grooved portion 3157 formed on the outer circumferential surface of the cylindrical portion 3151. The intermediate frame 3015 is made of, for example, a metal material or a resin material. In this case, it is made of aluminum, but a recessed portion 3151a is formed on the outer surface of the cylindrical portion 3151 to reduce weight. The groove 3131g has a vertical groove 3131h extending from the front end to the back side, and a horizontal groove 3131i extending circumferentially from the back end of the vertical groove 3131h. The protruding portion 3039b, which is the supported portion 3039 of the light source unit 3003, is attached and detached by moving along the groove 3131g. The groove 3131g is provided according to the number and pitch of the supported portions 3039 of the light source unit 3003. The groove 3131g constitutes the light source support portion. The groove 3151b is for the passage of the power receiving terminal 3045 or the ground terminal 3046 when the light source unit 3003 is mounted on the fixture body 3001, and extends in the front-to-back direction. The groove 3151b is provided with the total number of power receiving terminals 3045 and ground terminals 3046 of the light source unit 3003 and their pitch. The back end of the groove 3151b is connected to the groove 3182 of the socket 3018. The recessed portion 3153 is for the head of the screw 3995 used to fix the holder 3016 to the fixing frame 3017. The placement of the screw head 3995 within the recessed portion 3153 restricts the circumferential movement of the intermediate frame 3015 relative to the holder 3016. The projection 3155 fits into the through hole 3165 or recess on the surface of the holder 3016. This restricts the intermediate frame 3015 from moving circumferentially relative to the holder 3016. The projection 3155 is provided on both sides in the circumferential direction for the first recess 3153, on one side in the circumferential direction for the second recess 3153, and not for the third recess 3153. This ensures that there is only one orientation in which the holder 3016 and the intermediate frame 3015 can be joined, preventing the intermediate frame 3015 and the holder 3016 from being assembled in the wrong position. The groove portion 3157 is into which the extended portion 3173 of the fixed frame 3017 fits.

[0104] (1-3) Holder The holder 3016 has an annular (e.g., circular annular) annular portion 3161, a plurality (e.g., 3) fixing portions 3162 for fixing the holder 3016 to the fixing frame 3017, a groove portion 3163 formed between circumferentially adjacent fixing portions 3162 and recessed toward the front side, a plurality (e.g., 3) notches 3164 formed in the inner circumferential wall 3163a and outer circumferential wall 3163b that constitute the groove portion 3163, and a through hole 3165 formed in the bottom wall 3163c of the groove portion 3163 into which the projection portion 3155 of the intermediate frame 3015 fits. The annular portion 3161 is made of an insulating material, such as a resin material. The fixing portion 3162 is formed by a through hole that penetrates the annular portion 3161 in the front-to-back direction. A screw 3995 is inserted through this through hole from the front side. The screw 3995 is screwed into the screw hole 3171a of the annular portion 3171 of the fixing frame 3017.

[0105] The notch 3164 is for the socket 3231 that supports the conductive piece 3025 internally. In other words, the notch 3164 is the socket mounting portion. The conductive piece 3025 is electrically connected to the power receiving terminal 3045 or the ground terminal 3046 of the light source unit 3003. The socket 3231 is mounted from the back side to the notch 3164 of the holder 3016.

[0106] As shown in Figure 38, when viewed from the back, the socket 3018 has a main body portion 3181 that is arc-shaped and has an open bottom surface, a groove 3182 formed in the inner circumferential wall portion 3181a of the main body portion 3181, protrusions 3183 formed at both ends of the main body portion 3181 in the circumferential direction, a projection 3184 formed on the protrusions 3183 and projecting radially outward, and a protruding portion 3181c that projects to the front side from the front side ends of the inner circumferential wall portion 3181a and the outer circumferential wall portion 3181b. The groove 3182 has a vertical groove 3182a through which the power receiving terminal 3045 and the ground terminal 3046, which face the back side when the light source unit 3003 is mounted, pass, and a horizontal groove 3182b that extends circumferentially from the back side end of the vertical groove 3182a.

[0107] The conductive piece 3025 is connected to the terminal block 3013 by wiring (not shown) and constitutes the power supply section. The conductive piece 3025 is inserted into the socket 3018 from the front side, and in the inserted state, the connecting portion 3251 that connects to the power receiving terminal 3045 and the ground terminal 3046 is configured to be elastically deformable in the radial direction, facing the lateral groove 3182b of the socket 3018. The conductive piece 3025 has a bulge portion 3252 in which the upstream side when attached to the connection portion 3251 (and the downstream side when removed) bulges radially inward from the connection portion 3251. In other words, the conductive piece 3025 elastically deforms upon contact with the power supply terminal (and / or ground terminal 3046) on the path through which the power receiving terminal 3045 (and / or ground terminal 3046) moves circumferentially from the other end of the lateral groove 3182b (guide portion) in the direction of the central axis, allowing the power receiving terminal 3045 (and / or ground terminal 3046) to pass. Therefore, when the tips of the power receiving terminal 3045 and the ground terminal 3046 are in contact with the connection portion 3251, the power receiving terminal 3045 and the ground terminal 3046 are restricted from moving in the direction of circumferential removal of the light source unit 3003. The conductive piece 3025 corresponds to an example of the spring portion of Invention 1.

[0108] As shown in Figure 38, the holder 3016 has an engaging portion (engagement groove) 3163d into which the projection 3184 of the socket 3018 engages when the socket 3018 is pressed into the notch 3164, a fitting portion (notch) 3163e into which the convex portion 3181c of the socket 3018 fits, and a notch 3163f for the power receiving terminal 3045 and ground terminal 3046 of the light source unit 3003 to pass through. The engaging portion 3163d is formed in the inner circumferential wall 3163a and the outer circumferential wall 3163b, and the fitting portion 3163e and the notch 3163f are located in the bottom wall 3163c. When the socket 3018 is attached to the notched portion 3164 of the holder 3016, the back surface of the socket 3018 and the back end of the inner circumferential wall 3163a and outer circumferential wall 3163b of the holder 3016 become substantially flush.

[0109] (1-4) Fixed frame As shown in Figures 36 and 37, the fixed frame 3017 has a fixing portion (3171a) for fixing the holder 3016 and a connecting portion (3173a) that connects to the decorative frame 3014. By being connected to the decorative frame 3014, the holder 3016 and the intermediate frame 3015 are sandwiched together by the decorative frame 3014. The fixed frame 3017 has an annular (for example, circular) annular portion 3171 and an extended portion 3173 that extends from the annular portion 3171 toward the front side. The annular portion 3171 has a screw hole formed therein, which serves as a fixing portion 3171a for securing the holder 3016. This screw hole is threaded through the through hole of the holder 3016. Multiple fixing portions 3171a are provided at intervals (for example, equal intervals) in the circumferential direction (e.g., three). The extended portion 3173 is the part where the fixed portion 3171a is formed and extends from the outer peripheral edge. The extended portion 3173 has a through hole through which a screw 3996, which is screwed into a screw hole in the decorative frame 3014, is inserted, serving as a connecting portion 3173a that connects to the decorative frame 3014. The extended portion 3173 has bent portions 3173b that extend from both ends in the circumferential direction toward the central axis. The bent portions 3173b fit into the groove portion 3157 of the intermediate frame 3015 (see Figure 31). As a result, the movement of the intermediate frame 3015 in the circumferential direction relative to the fixed frame 3017 is restricted. A screw hole is formed in one of the three extensions 3173, which serves as a mounting portion 3173c for attaching the terminal block 3013.

[0110] (2)Terminal block The terminal block 3013 is attached to the frame 3010 (fixed frame 3017) via a mounting fixture 3019. The mounting fixture 3019 has a mounting portion (plate portion) 3191 to which the terminal block 3013 is attached, and an extension portion 3193 which extends from the mounting portion 3191 toward the front and has a mounting portion (through hole) that is attached to the extension portion 3173 of the fixed frame 3017 by a screw 3997.

[0111] 3. Attachment (detachment) The operation of attaching the light source unit 3003 to the fixture body 3001 will be described below. (a) Connect the wiring to the commercial power supply to the terminal block 3013, and use the mounting spring 3021 to mount the fixture body 3001 into the opening at the installation site. (b) Insert the light source unit 3003 into the frame 3010 of the fixture body 3001 from the front side. At this time, align the power receiving terminal 3045 and the ground terminal 3046 of the light source unit 3003 with the groove 3151b of the fixture body 3001, or align the supported part 3039 (protruding part 3039b) of the light source unit with the support part 3023 (vertical groove 3131h) of the fixture body 3001. The power receiving terminal 3045, the ground terminal 3046, and the supported portion 3039 correspond to the vertical grooves 3131h and 3151b of the fixture body 3001, respectively. When one of the power receiving terminal 3045, the ground terminal 3046, or the supported portion 3039 is aligned with the fixture body 3001, the other is also aligned.

[0112] (c) The light source unit 3003 is moved to the back side, and when the power receiving terminal 3045 and ground terminal 3046 of the light source unit 3003 reach the back end of the groove 3151b of the fixture body 3001, or when the supported part 3039 (protruding part 3039b) of the light source unit reaches the back end of the vertical groove 3131h of the support part 3023 of the fixture body 3001, the light source unit 3003 is rotated in the circumferential direction with respect to the central axis of the fixture body 3001. As a result, the supported portion 3039 of the light source unit 3003 engages with the support portion 3023 (and its lateral groove 3131i) of the fixture body 3001, completing the attachment of the light source unit 3003 to the fixture body 3001. Furthermore, as the light source unit 3003 is attached to the fixture body 3001, the power receiving terminal 3045 and the ground terminal 3046 of the light source unit 3003 are electrically connected to the conductive piece 3025 of the fixture body 3001. At this time, the power receiving terminal 3045 and the ground terminal 3046 are connected to the conductive piece 3025 in such a way that, as they move within the lateral groove 3182b, the connection portion 3251 of the conductive piece 3025 is elastically deformed radially outward, thereby improving the reliability of the electrical connection. (d) To remove the light source unit 3003, simply reverse the installation process described above, that is, perform (c) to (a) in order.

[0113] 4. Power receiving terminal and ground terminal (1) Example 1 The power receiving terminal 3045 and the ground terminal 3046 are configured to be located in the groove 3151b of the intermediate frame 3015 or the vertical groove 3182a of the socket 3018 when the supported portion 3039 of the light source unit 3003 is located in the vertical groove 3131h of the support portion 3023 of the fixture body 3001, and to be located in the horizontal groove 3182b of the socket 3018 when the supported portion 3039 of the light source unit 3003 is located in the horizontal groove 3131i of the support portion 3023 of the fixture body 3001. Furthermore, when the light source unit 3003 is attached to the fixture body 3001, the light source unit 3003 is supported by support parts 3039 that are provided at equal intervals in the circumferential direction. Therefore, the load of the light source unit 3003 can be evenly distributed in the circumferential direction, and the light source unit 3003 is supported in a stable state.

[0114] The power receiving terminal 3045 and the ground terminal 3046 do not come into contact with the inner peripheral wall portion 3181a forming the groove 3182 of the socket 3018 when the supported portion 3039 of the light source unit 3003 is engaged with the support portion 3023 of the fixture body 3001 (the light source unit 3003 is supported by the fixture body 3001). In other words, the power receiving terminal 3045 and the ground terminal 3046 are not supported by the socket 3018 (the power receiving terminal 3045 and the ground terminal 3046 are in a non-contact state with the socket 3018). This makes it difficult for the load of the light source unit 3003 to act on the power receiving terminal 3045 and the ground terminal 3046, thereby suppressing failure of the power receiving terminal 3045 and the ground terminal 3046. In addition, the circumferential dimension of the protruding portion 3039b is longer than that of the power receiving terminal 3045 and the ground terminal 3046. In other words, the contact area between the protruding portion 3039b and the lateral groove 3131i is larger than the contact area between the power receiving terminal 3045 and the ground terminal 3046 and the lateral groove 3182b. This allows the light source unit 3003 to be firmly supported. In addition, when the light source unit 3003 is mounted, if the supported portion 3039 comes into contact with the downstream end of the horizontal groove 3131i, the power receiving terminal 3045 and the ground terminal 3046 are positioned so as not to come into contact with the downstream end of 3182b, or the horizontal groove 3131i is formed in such a way. As a result, when the light source unit 3003 is installed, if the light source unit 3003 is rotated forcefully in the installation direction, contact between the power receiving terminal 3045 and the ground terminal 3046 and the end of the lateral groove 3182b in the installation direction (downstream side) is suppressed, thereby reducing the risk of failure of the power receiving terminal 3045 and the ground terminal 3046.

[0115] In Example 1, the supported portion 3039 and the support portion 3023 correspond to an example of the supported portion and support portion in Invention 1, and the vertical groove 3131h and horizontal groove 3131i of the support portion 3023 correspond to an example of the guide portion and support portion in Invention 1. Furthermore, the supported portion 3039 and the support portion 3023 correspond to an example of the supported portion and support portion in Invention 2, and the protruding portion 3039b of the supported portion 3039 corresponds to an example of the convex portion in Invention 2. Moreover, the protruding portion 3039b corresponds to an example of one of the protruding portion and power receiving terminal in Invention 5, and the power receiving terminal 3045 corresponds to an example of the other of the protruding portion and power receiving terminal in Invention 5. In this example 1, even if the supported part 3039 and the support part 3023 are damaged, the power receiving terminal 3045 or the ground terminal 3046 is supported by the socket 3018. In this way, the light source unit 3003 is supported by the fixture body 3001 in two stages, which can improve the reliability of the installation.

[0116] (2) Example 2 In Example 1, when the supported portion 3039 of the light source unit 3003 is engaged with the support portion 3023 of the fixture body 3001, the power receiving terminal 3045 and the ground terminal 3046 do not form the groove 3182 of the socket 3018 and are not in contact with the inner peripheral wall portion 3181a, but the opposite may also be true. In other words, in Example 2, when the power receiving terminal 3045 and the ground terminal 3046 are engaged with the groove 3182 in the inner peripheral wall portion 3181a of the socket 3018 of the fixture body 3001 (the light source unit 3003 is supported by the fixture body 3001), the protruding portion 3039b of the light source unit 3003 is not in contact with the cylindrical portion 3151 that forms the groove 3131g of the fixture body 3001. In other words, the protruding portion 3039b of the light source unit 3003 is not supported by the intermediate frame 3015 of the fixture body 3001.

[0117] In Example 2, when the light source unit 3003 is attached to the fixture body 3001, the light source unit 3003 is supported by the power receiving terminals 3045 and the ground terminal 3046 which are provided at equal intervals in the circumferential direction. Therefore, the load of the light source unit 3003 can be evenly distributed in the circumferential direction, and the light source unit 3003 is supported in a stable state. In Example 2, the power receiving terminal 3045 and the ground terminal 3046, as well as the grooves 3151b and 3182 of the intermediate frame 3015, correspond to examples of the supported part and the supporting part in Invention 1, the groove 3151b and the vertical groove 3182a correspond to examples of the guide part in Invention 1, and the horizontal groove 3182b corresponds to an example of the supporting part. Furthermore, the power receiving terminal 3045 corresponds to an example of one of the protruding part and the power receiving terminal in Invention 5, and the protruding part 3039b corresponds to an example of the other of the protruding part and the power receiving terminal in Invention 5. In this case, even if the power receiving terminal 3045, the ground terminal 3046, or the groove 3182 of the socket 3018 is damaged, the protruding portion 3039b is supported by the groove 3131g. In this way, the light source unit 3003 is supported by the fixture body 3001 in two stages, which can improve the reliability of the installation.

[0118] (3) Example 3 In Example 1, the light source unit 3003 is supported by the protruding portion 3039b of the light source unit 3003 engaging with the groove 3131g of the fixture body 3001. In Example 2, the light source unit 3003 is supported by the power receiving terminal 3045 and the ground terminal 3046 of the light source unit 3003 engaging with the groove 3182 of the fixture body 3001. In Example 3, the protruding portion 3039b of the light source unit 3003 engages with the groove 3131g of the fixture body 3001, and the power receiving terminal 3045 and the ground terminal 3046 of the light source unit 3003 engage with the groove 3182 of the fixture body 3001. In other words, when the power receiving terminal 3045 and the ground terminal 3046 are engaged with the groove 3182 in the inner peripheral wall portion 3181a of the socket 3018 of the fixture body 3001, the protruding portion 3039b of the light source unit 3003 abuts against the cylindrical portion 3151 that forms the groove 3131g of the fixture body 3001. To put it another way, the protruding portion 3039b of the light source unit 3003, as well as the power receiving terminal 3045 and the ground terminal 3046, are simultaneously supported by the intermediate frame 3015 and the holder 3016 (socket 3018) of the fixture body 3001. In this case, since the multiple supported parts 3039 (protruding parts 3039b), the power receiving terminal 3045, and the ground terminal 3046, which are provided at equal intervals in the circumferential direction, are supported, the load of the light source unit 3003 can be evenly distributed in the circumferential direction, and the light source unit 3003 is supported in a stable state. Furthermore, the protruding portion 3039b of the light source unit 3003 and the power receiving terminal 3045 or ground terminal 3046 engage simultaneously with 3131g and 3182 of the fixture body 3001 at multiple locations, thereby firmly attaching the light source unit 3003 to the fixture body 3001. In Example 3, the protruding portion 3039b corresponds to an example of the supported portion of Invention 1 and the first supported portion of Invention 4, the grooves 3131g and 3151b of the intermediate frame 3015 correspond to an example of the support portion of Invention 1 and the first support portion of Invention 4, the power receiving terminal 3045 and the ground terminal 3046 correspond to an example of the supported portion of Invention 1 and the second supported portion of Invention 4, and the groove 3182 of the holder 3016 (socket 3018) corresponds to an example of the support portion of Invention 1 and Invention 4.

[0119] Although each embodiment has been described above, the invention is not limited to these embodiments, and variations such as the following are also possible. Furthermore, embodiments may be combined with each other, with each other, or with each other. Furthermore, examples not described in the embodiments or modifications, as well as design changes that do not depart from the gist of the invention, are also included in the present invention.

[0120] (1) In the first embodiment, the supported portion 39 of the light source unit 3 and in the third embodiment, the supported portion 39 of the light source unit 2031 were provided on the heat dissipation holder 38, but they may be provided on other members. Other members include, for example, the base plate 30 and the heat dissipation fins 36. The supported portion 39 protrudes radially outward from the circumferential surface of the heat dissipation holder 38, but it may also protrude in an "L" shape, extending radially after protruding in the display direction. The supported portion 39 was integrally provided with the member on which the supported portion 39 is provided (in this embodiment, it is a heat dissipation holder), but it may also be provided as a separate part, for example, as the protrusion 1041 in the second embodiment.

[0121] (2) In the first embodiment, the guide portion 231 of the light source support portion 23 is composed of a groove 112g in the cover 11 and a vertical groove 131h in the frame body 13, but it may be a groove formed in a single member. Also, the groove 112g in the cover 11 may be omitted. However, if the groove 112g is present, the guide portion 231 becomes longer in the front-back direction, making it easier to guide the supported portion 39. The guide portion 231 was formed such that the groove width narrows as you move from the front side to the back side throughout the entire area in the front-back direction. However, for example, the groove width may be constant or gradually decrease in the area from the front edge to the middle in the front-back direction, and the groove width may be gradually decrease or constant in the area from the middle in the front-back direction to the back edge. The guide portion 231 has a groove shape that extends in the front-back direction, and the pair of circumferential edges (end faces) that form the groove are inclined to move closer to each other as you move from the front side to the back side, however, at least one of the pair of edges (end faces) may be inclined to move closer to the other side.

[0122] (3) In the first embodiment, the guide portion 231 of the light source support portion 23 of the fixture body 1 and the guide portion 1231 of the light source support portion 1023 of the fixture body 1001 of the second embodiment are inclined so as they move away from the support portions 232 and 1232 in the circumferential direction (direction of movement), but they may be parallel to the direction of movement or inclined so as they move towards the front side. In the first embodiment, the guide portion is formed in the shape of a groove, and in the second embodiment, it is composed of a single second extension portion 1273 that is erected radially. In other words, it is sufficient that the support portion 39,1040 of the light source unit 3,1003 can be contacted (restricted) if it shifts in a direction perpendicular to the front-back direction when it is mounted, and there should be at least one contacting (restricting) portion on both sides in the direction perpendicular to the front-back direction.

[0123] (4) In the first embodiment, the support portion 232 of the light source support portion 23 was formed by the horizontal groove 131i of the frame body 13, but it is sufficient that the supported portion 39 can be supported from the front side, and the structure does not have to be groove-shaped, for example it may be formed by a structure including the second portion 1252 and the third portion 1253 of the conductive piece 1025 of the light source support portion 1023 of the second embodiment (other parts such as the first portion 1251 may or may not be included).

[0124] (5) In the first embodiment, the supported portion 39 and the light source support portion 23 were provided as a pair that rotated symmetrically with respect to the central axis, but they may also be provided as a pair at positions that are not rotationally symmetrical with respect to the central axis, as in the supported portion 1040 and the light source support portion 1023 of the second embodiment. Conversely, in the second embodiment, the supported portion 1040 and the light source support portion 1023 were provided as a pair in positions that were not rotationally symmetric with respect to the central axis, but they may be provided rotationally symmetrically with respect to the central axis, as in the supported portion 39 and the light source support portion 23 of the first embodiment.

[0125] (6) In the first embodiment, the spring body 24 is positioned radially outward with respect to the supported portion 39 and is provided to contact the supported portion 39 from the radially outward side. In the second embodiment, the third portion 1253 of the conductive piece 1025 is positioned on the front side in the front-to-back direction with respect to the supported portion 1040 (protrusion 1041) and is provided to contact the supported portion 1040 from the front side. Thus, the spring portion only needs to be able to allow the supported portion to pass by contacting the supported portion and elastically deforming on the path through which the supported portion moves (which is also the path through which it moves in the circumferential direction), and its structure, arrangement, etc., are not particularly limited.

[0126] (7) In the third embodiment, the mounting portion 2014 and the position regulating portion 2015 are provided on the mounting fixture 2001, and the circumferential groove portion 2321a and the longitudinal groove portion 2321b are provided on the first reflector 2032 of the lighting fixture 2003. However, the mounting portion and the position regulating portion may be provided on the lighting fixture 2003 side, and the circumferential groove portion and the vertical groove portion may be provided on the mounting fixture 2001 side, or one of the mounting portion and the position regulating portion may be provided on the lighting fixture 2003 side, and the other of the mounting portion and the position regulating portion may be provided on the mounting fixture 2001 side.

[0127] (8) In the second embodiment, the protrusion 1041 of the supported portion 1040 had the function of a power receiving terminal, but it does not have to have the function of a power receiving terminal (it does not correspond to the supported portion of Invention 2, but to the unsupported portion of Invention 1). The protrusion 1041 had a large-diameter portion 1412 and a small-diameter portion 1411, but it may also be cylindrical with a constant diameter. Furthermore, while a circular cross-sectional shape is preferred for the protrusion 1041, it may also be elliptical, oblong, polygonal, or other shapes.

[0128] (9) In the first and third embodiments, the supported portion 39 is formed on the chord-shaped portion 386 of the heat dissipation holder 38 (i.e., it is non-circular when viewed from the front or back direction). However, if there is no need to consider the radial dimensions, the heat dissipation holder 38 may be circular when viewed from the front or back direction. The same applies when the supported portion 39 is provided on a member other than the heat dissipation holder 38, for example, on the base plate 30.

[0129] (10) The power receiving terminal 3045 and the ground terminal 3046 of the fourth embodiment are formed by press-forming a metal plate, but they may be pin-shaped, for example, like the power receiving terminal 1041 of the second embodiment. At least one of the power receiving terminal 3045 and the ground terminal 3046 may also be pin-shaped, for example, by making only the ground terminal 3046 pin-shaped, it can be easily distinguished from the power receiving terminal 3045. (11) The frame 3010 of the fourth embodiment has a decorative frame 3014, an intermediate frame 3015, a holder 3016, and a fixing frame 3017, but for example, the intermediate frame and the holder may be made as a single unit.

[0130] (10) In the first, second, and fourth embodiments, a protruding supported portion was provided on the light source units 3,1003, 3003 and a grooved support portion was provided on the fixture body 1,1001, 3001. However, the engagement structure (concave and convex structure) of the support portion and the supported portion may be reversed.

[0131] The first to third embodiments describe at least the following inventions 1 to 3, but are not limited to these inventions and include other inventions as well. <Invention 1> 1. Prior art Japanese Patent Publication No. 2016-51596 proposes a lighting device comprising a support frame for a downlight fixed to a mounting hole in the ceiling, and a light source unit attached to this support frame. In this lighting device, the light source body of the light source unit is installed by inserting it into the support frame and pushing it upward (see Figure 4). At this time, the light source unit is fixed to the support frame by fitting the recess of the light source body into the protrusion formed on the inner surface of the mounting part of the support frame (paragraph 0015).

[0132] 2. Problems that Invention 1 aims to solve In the above-described lighting device, the recessed and protruding parts are only fitted together, so if a strong downward force is applied to the light source unit, there is a risk that the light source unit may detach from the support frame. The main body of the device corresponds to the support frame of the background technology. Invention 1 aims to provide a lighting device that is less likely to detach from the fixture body even when a downward force is applied to the light source unit.

[0133] 3. Invention 1 The first lighting device according to Invention 1 is A cylindrical device body that is attached to the installation site, A light source unit that emits light toward one side in the direction of the central axis extending from the central axis of the aforementioned device body, Equipped with, The supported portion of the light source unit is supported by the support portion of the appliance body, so that the light source unit is detachably attached to the appliance body. The support portion of the appliance body has a guide portion that guides the supported portion in the central axis direction, and a support portion that is formed along the circumferential direction around the central axis from the other end in the central axis direction in the guide portion and supports the supported portion. Thereby, in the mounted state where the light source unit is mounted on the appliance body, even if a force acts on the light source unit in one side in the central axis direction, since the supported portion is supported by the support portion, it is possible to make it difficult for the light source unit to come off from the appliance body.

[0134] The second lighting device according to Invention 1 is the first lighting device, wherein the supported portion has a protruding portion that protrudes in the radial direction of the central axis direction. The guide portion of the support portion has a groove shape that extends along the central axis direction. In the guide portion, the groove width at one end is larger than the groove width at the other end. Thereby, it is possible to easily insert the supported portion of the light emitting unit into the guide portion.

[0135] The third lighting device according to Invention 1 is the first or second lighting device, wherein the support portion of the support portion has a groove shape that extends along the circumferential direction and is connected to the guide portion. The other end side of the guide portion is an inclined surface that moves to the other side in the central axis direction as it moves away from the support portion in the circumferential direction. Thereby, it is possible to easily guide the supported portion to the support portion.

[0136] The fourth lighting device according to Invention 1 is the first to third lighting devices, wherein the supported portion and the support portion are provided in a pair in rotational symmetry with respect to the central axis. This allows the light source unit to be fixed to the fixture body regardless of which support part is inserted into, making it easier to attach the light source unit to the fixture body. In other words, it can be attached to the fixture body regardless of the orientation of the light source unit.

[0137] The fifth lighting device according to Invention 1 is, in the first to fourth lighting devices, The device body comprises a cylindrical portion having the central axis, The cylindrical portion has, in a cross-section perpendicular to the central axis, an arc-shaped circumferential wall portion and a chord-shaped chord-shaped circumferential wall portion. The outer surface of the chord circumferential wall portion is located inside the imaginary line containing the arc of the outer surface of the circular circumferential wall portion. The support portion is provided on the circumferential wall portion of the chord, When the supported portion of the light source unit is supported by the support portion of the fixture body, the tip of the protruding portion of the supported portion extends radially outward from the outer surface of the chord peripheral wall portion. This ensures that the supported part is securely supported by the support part without increasing the outer circumference of the cylindrical part. In other words, since the tip of the supported part protrudes outward from the outer surface of the support part, sufficient contact area is secured between the protruding part and the support part, and there is no risk of the supported part coming off the support part.

[0138] The sixth lighting device according to Invention 1 is, in the first to fifth lighting devices, The portion on which the supported part is formed has an outer surface that has a shape corresponding to the inner surface of the cylindrical part of the main body of the device. This allows the light source unit to move (rotate) in the circumferential direction, and the supported part is supported by the support part, thus eliminating the risk of the light source unit becoming detached from the fixture body.

[0139] The seventh lighting device according to Invention 1 is, in the first to sixth lighting devices, The device body includes a spring portion that contacts the supported portion and elastically deforms on a path through which the supported portion moves in the circumferential direction from the other end of the guide portion in the central axis direction, thereby allowing the supported portion to pass. This restricts the movement of the light source unit toward the guide when it is attached to the fixture body, making it difficult for the light source unit to detach from the fixture body.

[0140] The eighth lighting device according to Invention 1 is, in the first to seventh lighting devices, The cylindrical portion of the device body has rib portions on the inner surface of the circumferential wall portion that protrude inward in the radial direction and extend in the circumferential direction, The rib portion comes into contact with or approach the portion where the supported portion is formed when the supported portion moves to the other side in the direction of the central axis of the guide portion and comes into contact with or approach the end face of the other end of the guide portion. This allows for positional control not only of the guide portion but also of the supported portion over a wide area, enabling positional control to the other side in the central axis direction when mounting the light source unit.

[0141] The ninth lighting device according to Invention 1 is, in the first to eighth lighting devices, The protruding portion of the supported part has a rounded end in the circumferential direction at its tip in the protruding direction, and this rounded portion contacts the spring portion. This allows the rounded portion to smoothly pass over the V-shaped section of the spring when the protruding tip attempts to do so, thus enabling smooth attachment and detachment of the light source unit to the fixture body.

[0142] <Invention 2> 1. Prior art Japanese Patent Publication No. 2020-136207 describes a lighting fixture 10 comprising a fixture housing 11, a light source unit 12, and a socket 20, wherein the light source unit 12 is mounted on the socket 20 by rotating the light source unit 12 with the pin terminals 13 of the light source unit 12 inserted from below into the pin insertion opening 34 of the socket 20. 2. Problems that Invention 2 aims to solve The above technology has the problem that it is difficult to attach the light source unit 12 to the socket 20. In Invention 2, an object is to provide a lighting device in which a light source unit can be easily attached to an instrument body.

[0143] 3. Invention 2 The first lighting device according to Invention 2 is a cylindrical instrument body attached to an installation site, and a light source unit having a light source module that emits light toward one side in the central axis direction in which the central axis of the instrument body extends and includes By supporting the supported portion of the light source unit by the support portion of the instrument body, the light source unit is detachably attached to the instrument body. The supported portion of the light source unit has a convex portion that protrudes outward in the radial direction with respect to the central axis. Thereby, it becomes easy to confirm the position of the convex portion, and compared with the case where the convex portion protrudes in the central axis direction from the light source unit, the light source unit can be easily attached.

[0144] The second lighting device according to Invention 2 is, in the first lighting device, the support portion includes a power supply terminal that supplies power to the light source unit, the supported portion includes a power receiving terminal that receives power from the power supply terminal, By being supported by the support portion, the supported portion is electrically connected to the support portion. Thereby, in the relationship between the light source unit and the instrument body, support and electrical connection can be performed simultaneously.

[0145] The third lighting device according to Invention 2 is, in the first or second lighting device, there are a pair of the support portion and the supported portion, the support portion and the supported portion are provided at positions that are not point-symmetrical with respect to the central axis. Thereby, when the light source unit is attached to the instrument body, misinsertion of the light source unit can be prevented.

[0146] The fourth lighting device according to Invention 2 is, in the first to third lighting devices, The support portion comprises a conductive piece that contacts the supported portion and a case that houses the conductive piece. This makes it easy to install conductive pieces.

[0147] The fifth lighting device according to Invention 2 is a fourth lighting device, The device body has a frame comprising a first frame disposed on one side in the direction of the central axis, a second frame disposed on the other side of the central axis, and a connecting body that connects the first frame and the second frame in the direction of the central axis. The case is fixed to the frame while attached to the base plate. This makes it easy to install conductive pieces.

[0148] <Invention 3> 1. Prior art Japanese Patent Publication No. 2018-37375 describes an illumination device 1 comprising a frame 10, an angle adjustment device 2, and a light source unit 3, wherein the angle of the light source unit 3 can be adjusted by the angle adjustment device 2. 2. Problems that Invention 3 aims to solve The angle adjustment device 2 of the above technology has a drive unit such as a motor, and therefore has the problem of having a complex structure. Invention 3 aims to provide a lighting device with a simple structure and adjustable angle of the light source unit.

[0149] 3. Invention 3 The first lighting device according to Invention 3 is: A mounting device that is attached to the installation site, A lighting fixture that is inserted into and mounted from a first direction to the aforementioned mounting fixture and includes a light source unit. Equipped with, One of the mounting fixture and the lighting fixture includes a first groove extending in the circumferential direction with respect to the first direction, and a plurality of second grooves extending in a direction parallel to the first direction and formed in the circumferential direction. The other of the mounting fixture and the lighting fixture comprises a first movable body that is movable in the radial direction with reference to the first direction, a first biasing means for biasing the first movable body toward the first groove, a second movable body that is movable in the radial direction with reference to the first direction, and a second biasing means for biasing the second movable body toward the second groove. This makes it possible to adjust the angle of the lighting fixture without requiring a motor or other drive unit.

[0150] The second lighting device according to Invention 3 is, in the first lighting device, The biasing force of the first biasing means is greater than the biasing force of the second biasing means. This allows for smooth angle adjustment.

[0151] The third lighting device according to Invention 3 is a first or second lighting device, When viewing the first groove and the second groove from a direction perpendicular to the first direction, The first groove is located on the insertion side of the lighting fixture relative to the second groove. This makes it easier to process the second groove when it is formed by punching, because the second groove is provided in the direction of the die punching.

[0152] The fourth lighting device according to Invention 3 is, in the first to third lighting devices, One of the mounting fixture and the lighting fixture is the mounting fixture, and the first and second movable bodies and the first and second biasing means are provided on the cylindrical portion of the mounting fixture. The other of the mounting fixture and the lighting fixture is the lighting fixture, and the first groove and the second groove are provided in the cylindrical portion of a reflector holder that detachably mounts a reflector that reflects light emitted from a light source unit.

[0153] <Invention 4> 1. Prior art Japanese Patent Publication No. 2016-51596 proposes a lighting device comprising a support frame for a downlight fixed to a mounting hole in the ceiling, and a light source unit attached to this support frame. In this lighting device, the light source body of the light source unit is installed by inserting it into the support frame and pushing it upward (see Figure 4). At this time, the light source unit is fixed to the support frame by fitting the recess of the light source body into the protrusion formed on the inner surface of the mounting part of the support frame (paragraph 0015).

[0154] 2. Problems that Invention 4 aims to solve In the above-described lighting device, the recessed and protruding parts are only fitted together, so if a strong downward force is applied to the light source unit, there is a risk that the light source unit may detach from the support frame. The main body of the device corresponds to the support frame of the background technology. Invention 1 aims to provide a lighting device that is less likely to detach from the fixture body even when a downward force is applied to the light source unit.

[0155] 3. Invention 4 The first lighting device according to Invention 4 is: A cylindrical device body that is attached to the installation site, A light source unit that emits light toward one side in the direction of the central axis extending from the central axis of the aforementioned device body, Equipped with, The first supported portion of the light source unit is supported by the first support portion of the fixture body, and the second supported portion of the light source unit is supported by the second support portion of the fixture body, thereby enabling the light source unit to be detachably attached to the fixture body. As a result, the light source unit is supported by multiple types of support parts within the fixture body, making it less likely to detach from the fixture body.

[0156] The second lighting device according to Invention 4 is, in the first lighting device, The aforementioned device body is equipped with a terminal block for connecting to the commercial power supply side. The first supported portion is a protruding portion provided on a base body having a light source module on its surface and extending radially outward, The first support portion is a groove provided on the frame constituting the main body of the device and into which the protruding portion engages. The second supported portion is a power receiving terminal for receiving power from the terminal block, and is supported in a manner that protrudes radially outward from the base body. The second support portion is a groove provided on the frame and into which the power receiving terminal engages. This allows the number of supported functions to be increased without increasing the number of components, by giving the power receiving terminal a supported function. Furthermore, if there is an earth terminal, the structure may be designed to support the earth terminal, or it may be designed not to support the earth terminal.

[0157] The third lighting device according to Invention 4 is a second lighting device in which, The area over which the first supported portion is supported by the first support portion is greater than the area over which the second supported portion is supported by the second support portion. This reduces the load on the support acting on the power receiving terminal.

[0158] <Invention 5> 1. Prior art Japanese Patent Publication No. 2016-51596 proposes a lighting device comprising a support frame for a downlight fixed to a mounting hole in the ceiling, and a light source unit attached to this support frame. In this lighting device, the light source body of the light source unit is installed by inserting it into the support frame and pushing it upward (see Figure 4). At this time, the light source unit is fixed to the support frame by fitting the recess of the light source body into the protrusion formed on the inner surface of the mounting part of the support frame (paragraph 0015).

[0159] 2. Problems that Invention 4 aims to solve In the above-described lighting device, the recessed and protruding parts are only fitted together, so if a strong downward force is applied to the light source unit, there is a risk that the light source unit may detach from the support frame. The main body of the device corresponds to the support frame of the background technology. Invention 1 aims to provide a lighting device that is less likely to detach from the fixture body even when a downward force is applied to the light source unit.

[0160] 3. Invention 5 The first lighting device according to Invention 5 is A cylindrical device body equipped with a terminal block for connecting to the commercial power supply and mounted at the installation site, A light source unit that emits light toward one side in the direction of the central axis extending from the central axis of the aforementioned device body, Equipped with, The light source unit comprises a base body having a light source module on its surface, an overhanging portion that extends radially outward, and a power receiving terminal for receiving power from the terminal block, which is supported in a manner that protrudes radially outward from the base body. The device body is provided with a frame that has a first groove into which the protruding portion can engage and a second groove into which the power receiving terminal can engage. When one of the protruding portion and the power receiving terminal is engaged with the first groove or the second groove, the other of the protruding portion and the power receiving terminal is not engaged with the first groove or the second groove. As a result, either the protruding portion or the power receiving terminal engages with the first or second groove, making it difficult for the device to detach from the main body.

[0161] The first lighting device according to Invention 5 is, in the first lighting device, One of the protruding portion and the power receiving terminal is the protruding portion, The first support area in which the protruding portion is supported by the first groove is larger than the second support area in which the power receiving terminal is supported by the second groove. This allows for a larger support area compared to when the power receiving terminal is supported, resulting in the light source unit being firmly supported by the fixture body.

[0162] Invention 1 may have the inventive features of Inventions 2 to 5, Invention 2 may have the inventive features of Inventions 1, 3 to 5, Invention 3 may have the inventive features of Inventions 1, 2, 4, and 5, Invention 4 may have the inventive features of Inventions 1 to 3 and 5, Invention 5 may have the inventive features of Inventions 1 to 4, and Inventions 1 to 5 may have the configurations described in the embodiments and modified examples. [Explanation of Symbols]

[0163] 1. Main body of the device 3 Light source units 23 Light source support part 31 Light source module 39 Supported part 231 Information section 232 Support part

Claims

1. A cylindrical device body that is attached to the installation site, A light source unit that emits light toward one side in the direction of the central axis extending from the central axis of the aforementioned device body, Equipped with, The supported portion of the light source unit is supported by the support portion of the fixture body, so that the light source unit is detachably attached to the fixture body. The support portion of the device body has a guide portion that guides the supported portion in the direction of the central axis, and a support portion that is formed along the circumferential direction around the central axis from the other end of the guide portion in the direction of the central axis and supports the supported portion. Lighting device.

2. The supported portion has a protruding portion that protrudes radially in the direction of the central axis, The guide portion of the support part has a groove shape that extends along the central axis direction, In the aforementioned guide portion, the groove width at one end is greater than the groove width at the other end. The lighting device according to claim 1.

3. The support portion of the support part extends along the circumferential direction and has a groove shape that connects to the guide portion, The other end of the guide portion is an inclined surface that shifts to the other side in the direction of the central axis as it moves away from the support portion in the circumferential direction. The lighting device according to claim 2.

4. The supported portion and the supporting portion are provided as a pair in a rotationally symmetrical manner with respect to the central axis. The lighting device according to claim 3.

5. The device body comprises a cylindrical portion having the central axis, The cylindrical portion has, in a cross-section perpendicular to the central axis, an arc-shaped circumferential wall portion and a chord-shaped chord-shaped circumferential wall portion. The outer surface of the chord circumferential wall portion is located inside the imaginary line containing the arc of the outer surface of the circular circumferential wall portion. The support portion is provided on the circumferential wall portion of the chord, When the supported portion of the light source unit is supported by the support portion of the fixture body, the tip of the protruding portion of the supported portion extends radially outward from the outer surface of the chord peripheral wall portion. The lighting device according to claim 3.

6. The portion on which the supported portion is formed has an outer surface having a shape corresponding to the inner surface of the cylindrical portion of the main body of the device. The lighting device according to claim 5.

7. The device body includes a spring portion that contacts the supported portion and elastically deforms on a path in which the supported portion moves in the circumferential direction from the other end of the guide portion in the central axis direction, thereby allowing the supported portion to pass. The lighting device according to claim 3.

8. The cylindrical portion of the device body has rib portions on the inner surface of the circumferential wall portion that protrude inward in the radial direction and extend in the circumferential direction, The rib portion abuts or approaches the portion where the supported portion is formed when the supported portion moves to the other side in the direction of the central axis of the guide portion and abuts or approaches the end face of the other end of the guide portion. The lighting device according to claim 5.

Images