Lighting fixtures

Abstract

To provide a luminaire in which waterproofness and airtightness are improved by packing.SOLUTION: A luminaire according to the present invention comprises: an optical control member through which light emitted from a light source is transmitted; a cover part in which an emitting port for exposing the optical control member is formed; and packing sandwiched between the optical control member and the cover part, and arranged around the emitting port. The packing is formed in an annular shape. An inner peripheral part of the packing is formed in such a manner that a surface on the side of the cover part comprises an inclined surface inclined to the side of the light source as goes toward a tip on the inner peripheral side, and its thickness becomes thinner as going toward the inner peripheral side.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a lighting fixture, and more particularly to a structure around an emission port. [Background technology]

[0002] Conventionally, lighting fixtures have been known in which an optical control member such as a lens protrudes from an emission port formed in a cover part that covers the built-in components of the lighting fixture (see, for example, Patent Document 1). The lighting fixture described in Patent Document 1 includes a packing that covers the flange of the lens. The packing is disposed between the cover part and the light source attachment part, and closes the gap between the emission port formed in the cover part and the lens. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6489869 Summary of the Invention [Problem to be solved by the invention]

[0004] The packing of the lighting fixture described in Patent Document 1 is attached by covering the flange of the lens. Therefore, it is difficult to attach the packing to the flange of the lens. In addition, in order to improve assembly, when the packing is placed between the lens and the cover and sandwiched between the lens and the cover to ensure waterproofness, the thickness of the packing needs to be increased to close the gap between the lens and the cover. In this case, the packing may protrude from between the light outlet and the outer peripheral surface of the convex shape of the lens. If the packing protrudes from between the light outlet and the lens, a gap may occur due to deformation of the packing, and the lighting fixture has a problem of losing waterproofness and airtightness.

[0005] The present invention has been made to solve the above-mentioned problems, and has an object to provide a lighting fixture in which the assembling ability of the gasket is improved while the waterproofness and airtightness provided by the gasket are improved. [Means for solving the problem]

[0006] The lighting device according to the present invention includes an optical control member through which light emitted from a light source passes, a cover portion having an emission opening for exposing the optical control member, and a packing that is sandwiched between the optical control member and the cover portion and disposed around the emission opening, the packing being formed in an annular shape, and an inner peripheral portion of the packing being: In a state before the optical control member is fixed to the cover portion, The surface on the light source side extends in a direction perpendicular to the optical axis direction of the light source, and the surface on the cover side has an inclined surface that is inclined toward the light source toward the tip on the inner periphery side, and is formed so that the thickness becomes thinner toward the inner periphery side. When the optical control member is fixed to the cover portion, the surface on the light source side is inclined toward the light source toward the tip on the inner circumferential side in accordance with the shape of the optical control member. There are. Effect of the Invention

[0007] According to the present invention, the above-mentioned configuration allows the packing to be pressed between the lens and the cover, and prevents the packing from protruding from between the light exit of the cover and the optical control member, thereby improving the ease of assembly, waterproofness, and airtightness of the lighting device. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a lighting fixture 1a according to a first embodiment. [Diagram 2] 1 is an exploded perspective view showing a lighting fixture 1a according to a first embodiment. [Diagram 3] FIG. 3 is an exploded perspective view of the cover assembly 10 of FIG. 2. [Figure 4] 1 is a cross-sectional view of a lighting fixture 1a according to a first embodiment. [Diagram 5] 5 is an enlarged view of the periphery of the light source unit 20 in FIG. [Figure 6] 4 is an explanatory diagram of a cross-sectional structure of a comparative example around light source unit 20 of lighting device 1a according to embodiment 1. FIG. [Figure 7] 1 is an explanatory diagram illustrating an example of a cross-sectional structure around a light source unit 20 of a lighting device 1a according to Embodiment 1. FIG. [Figure 8] 1 is an explanatory diagram of a cross-sectional structure perpendicular to an optical axis L of a lighting device 1a according to a first embodiment. [Figure 9] 13 shows a modified example of guide fitting 12 of lighting fixture 1a according to the first embodiment. [Figure 10] FIG. 1 is a perspective view of a lighting fixture 101a which is a modified example of the lighting fixture 1a according to the first embodiment. [Figure 11] 11 is an exploded perspective view of a main unit 160 constituting the lighting fixture 101a of FIG. [Figure 12] 11 is an exploded perspective view of a cover assembly 110 constituting the lighting fixture 101a of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The lighting device according to the embodiment of the present invention will be described in detail below with reference to the drawings. Note that the size relationship between the components in the following drawings may differ from the actual relationship. In addition, in the following drawings, the same reference numerals are used to denote the same or equivalent components, and this is common throughout the entire specification. Furthermore, the forms of the components shown in the entire specification are merely examples, and are not limited to these descriptions.

[0010] Embodiment 1 <Lighting fixture 1a> Fig. 1 is a perspective view showing a lighting fixture 1a according to the first embodiment. Fig. 2 is an exploded perspective view showing the lighting fixture 1a according to the first embodiment. Fig. 3 is an exploded perspective view of the cover assembly 10 of Fig. 2. The lighting fixture 1a includes a housing 50 formed in a substantially cylindrical shape. A top surface 80 side portion of the housing 50 is attached to a mounting portion such as a ceiling via a waterproof packing 90. The bottom surface of the housing 50 forms the cover front surface portion 11, which is the portion from which light rays from the light source 5 (see Fig. 5) are emitted.

[0011] As shown in FIG. 2, the lighting fixture 1a is fixed to a mounting portion such as a ceiling. The lighting fixture 1a includes a cover assembly 10, a lighting device 30, and a main unit 60. The cover assembly 10 is formed by fixing a light source portion 20 to a cover portion 10a. The main unit 60 has a power terminal block 40 fixed to a main body structure portion 60a, and further has the lighting device 30 attached thereto. The main body structure portion 60a has a top surface 80, and is the portion that is fixed to the mounting portion. Furthermore, the cover portion 10a of the lighting fixture 1a is formed with a plurality of display ports 15. The display ports 15 are portions that receive external signals.

[0012] <Cover assembly 10> As shown in FIG. 3, the cover assembly 10 includes a cover portion 10a, a light source portion 20, and a heat sink 27. The cover portion 10a is cylindrical with a bottom, and houses the power terminal block 40 and the lighting device 30 fixed to the main unit 60 inside the cylindrical portion, as well as the light source portion 20 fixed to the cover portion 10a. The cover portion 10a, together with the main body structure portion 60a, constitutes a part of the housing 50 of the lighting fixture 1a. The cover portion 10a has a cover front portion 11 corresponding to the bottom of the cylindrical portion with a bottom, and a cover side portion 13 corresponding to the cylindrical portion. The cover portion 10a has a guide metal fitting 12 fixed to the inner surface of the cover side portion 13. The cover portion 10a has an emission port 14 that exposes the optical control member 21 formed in the cover front portion 11 that forms the bottom surface 10e (see FIG. 5) of the cylindrical portion with a bottom. The light source unit 20 and the packing 22 are fixed to the bottom surface 10e, which is the inner surface of the cover front surface 11 of the cover unit 10a. In addition, a signal receiving unit (not shown) and a monitor packing 23 are fixed to the bottom surface 10e of the cover unit 10a. The light source unit 20, the packing 22, the signal receiving unit, and the monitor packing 23 are sandwiched between the cover front surface 11 and the heat sink 27 and are fixed by being pressed. The packing 22 is also called a lens packing.

[0013] <Light source section 20> FIG. 4 is a cross-sectional view of the lighting device 1a according to the first embodiment. FIG. 4 shows a cross-sectional structure of the lighting device 1a along the optical axis L of the light beam emitted from the light source 5. FIG. 5 is an enlarged view of the periphery of the light source unit 20 in FIG. 4. The light source unit 20 includes a holder 9 to which the light source 5 and the optical control member 21 are attached. The light source unit 20 includes a heat sink 27 attached thereto, and is fixed to the bottom surface of the cover unit 10a via the heat sink 27 with screws 10-3. The optical control member 21 is, for example, a lens, and is a member that controls the direction and range of travel of the light beam emitted from the light source 5. The optical control member 21 includes an optical control unit 21a protruding from the center in the direction in which the light beam is emitted from the light source 5, i.e., in the direction of the optical axis L, and a flange portion 21b formed by protruding outward from the optical control unit 21a. The flange portion 21b is fixed to the holder 9 by an L-shaped rib 9b. The optical axis L is the central axis of the light beam emitted by the light source 5, and coincides with the central axis of the lighting device 1a in the first embodiment. In other words, the optical axis L coincides with the central axis of the cylinder formed by the cover side surface portion 13 of the cover portion 10a. In the following description, the structure may be described using the optical axis L instead of the central axis of the lighting device 1a and the central axis of the cylinder formed by the cover side surface portion 13.

[0014] The holder 9 of the light source unit 20 is fixed by engaging the engagement portion 9a with the heat sink 27. The heat sink 27 is fixed inside the cover unit 10a by pulling it toward the cover front surface portion 11 with the screw 10-3. The light source unit 20 and the packing 22 are sandwiched between the heat sink 27 and the cover front surface portion 11 of the cover unit 10a and pressed and fixed. The screw 10-3 penetrates the screw packing 10-4 arranged between the cover front surface portion 11 and the heat sink 27 and is screwed into the heat sink 27. The screw packing 10-4 is compressed between the cover front surface portion 11 and the heat sink 27, improving the airtightness and waterproofness of the inside of the housing 50.

[0015] <Structure of the Periphery of the Light Source Unit 20> 3 and 5, a packing 22 is disposed between the light source section 20 and the cover front surface section 11, and the packing 22 closes the gap between the optical control member 21 and the light outlet 14, improving the waterproofness and airtightness of the inside of the housing 50. The packing 22 is formed in an annular shape and disposed so as to surround the periphery of the optical control section 21a which is the protruding section of the optical control member 21. In other words, the annular packing 22 surrounds the outside of the optical control section 21a of the optical control member 21 with the optical axis L as the center.

[0016] <Structure of the Periphery of the Light Source Unit 20> As shown in FIG. 5, the periphery of the light exit 14 of the cover part 10a is formed to protrude toward the outside of the cover part 10a. That is, when viewed from inside the cover part 10a, the bottom surface 10e of the cover part 10a, which is a bottomed cylindrical shape, has a packing arrangement surface 10c that is recessed toward the direction in which the light beam is emitted more than the surrounding surface 10b. The packing arrangement surface 10c is formed in an annular shape around the light exit 14. In addition, a connection surface 10d extending in a direction along the optical axis L is formed between the packing arrangement surface 10c and the surrounding surface 10b. In the cross-sectional shape shown in FIG. 5, the packing 22 is formed in an L-shape around the light exit 14. The packing 22 is arranged so as to be along the packing arrangement surface 10c and the connection surface 10d.

[0017] <Packing 22> At least the inner periphery of the packing 22 is formed thick. The inner periphery 22a of the packing 22 has a thickness capable of closing the gap formed between the packing arrangement surface 10c and the optical control member 21. In other words, the thickness dimension of the inner periphery 22a of the packing 22 is greater than the distance from the packing arrangement surface 10c to the optical control member 21. In Fig. 5, the inner periphery 22a of the packing 22 is shown in a natural state in which it is not compressed, but in reality, at least the portion overlapping with the optical control member 21 in Fig. 5 is compressed or deformed.

[0018] In the direction along the optical axis L, the thick portion 22b of the inner periphery 22a of the packing 22, which is sandwiched between the optical control member 21 and the packing arrangement surface 10c, is compressed. Also, the inner periphery side tip 22c of the inner periphery 22a of the packing 22 is deformed along the shape of the optical control member 21. The inner periphery 22a of the packing 22 is formed so that the thickness dimension in the direction along the optical axis L decreases toward the inner periphery side. The surface of the packing 22 on the packing arrangement surface 10c side shown in FIG. 5 is formed flat up to the tip on the inner periphery side. And the surface of the packing 22 facing the optical control member 21 side has an inclined surface 22f that inclines toward the packing arrangement surface 10c toward the inner periphery side.

[0019] The thick part 22b of the inner periphery 22a of the packing 22 is compressed, shrinking in the vertical direction in FIG. 5 and expanding in the horizontal direction. Then, the inner periphery tip 22c located on the inner periphery side of the thick part 22b is affected by the deformation of the thick part 22b and moves to the inner periphery side. At this time, the inner periphery tip 22c moves to the optical control part 21a side and abuts against the optical control part 21a and is deformed. The inner periphery tip 22c has an inclined surface 22f on the surface on the optical control member 21 side, and is formed so that the thickness becomes thinner toward the inner periphery side. Therefore, the inner periphery tip 22c is suppressed from protruding from the emission port 14. The inner periphery tip 22c is deformed along the shape of the optical control member 21. Therefore, it is possible to suppress the occurrence of a gap between the packing 22 and the optical control member 21. Furthermore, since the packing 22 is prevented from protruding from the light outlet 14, the optical characteristics of the light emitted from the optical control member 21 are not deteriorated, and the aesthetic appearance of the lighting fixture 1a is not impaired.

[0020] Moreover, the dimension of outer periphery 22d of packing 22 in the direction along optical axis L is formed to be larger than the distance from packing arrangement surface 10c of cover part 10a to the surrounding surface 10b in the direction along optical axis L. Outer periphery 22d of packing 22 is sandwiched and positioned between holder 9, which is a part of light source part 20, and packing arrangement surface 10c, and is compressed. This allows packing 22 to improve the airtightness and waterproofness of the inside of lighting fixture 1a.

[0021] Furthermore, the inner peripheral portion 22a and the outer peripheral portion 22d of the packing 22 are connected by a connecting portion 22e. The connecting portion 22e of the packing 22 is formed so that the thickness dimension in the direction along the optical axis L is smaller than those of the inner peripheral portion 22a and the outer peripheral portion 22d. Therefore, although the inner peripheral portion 22a and the outer peripheral portion 22d of the packing 22 are each compressed, the structure is such that the deformation is unlikely to affect each other.

[0022] <Comparative Example> FIG. 6 is an explanatory diagram of a cross-sectional structure of a comparative example around the light source unit 20 of the lighting device 1a according to the first embodiment. FIG. 6(a) shows a state before the light source unit 20 is fixed to the cover front surface portion 11 of the cover portion 10a. FIG. 6(b) shows a state in which the light source unit 20 is fixed to the cover front surface portion 11 of the cover portion 10a. As shown in FIG. 6(a), the packing 122 in the comparative example has an inner periphery portion 122a formed with a uniform thickness. Then, as shown in FIG. 6(b), in a state in which the packing 122 is compressed, the inner periphery portion 122a deforms toward the inner periphery side, and a part of it protrudes from the light outlet 14. The packing 122 deforms so that a part or the whole of the inner periphery portion 122a protrudes from the light outlet 14. Therefore, in the comparative example of the lighting device 1a, a partial gap may be generated between the packing 122 and the packing arrangement surface 10c, or between the packing 122 and the optical control member 21. As a result, in the comparative example of lighting fixture 1a, there is a risk of the airtightness and waterproofness being reduced.

[0023] <Modification of packing 22> FIG. 7 is an explanatory diagram of an example of a cross-sectional structure around the light source unit 20 of the lighting device 1a according to the first embodiment. FIG. 7(a) shows a state before the light source unit 20 is fixed to the cover front surface 11 of the cover unit 10a. FIG. 7(b) shows a state in which the light source unit 20 is fixed to the cover front surface 11 of the cover unit 10a. As shown in FIG. 7(a), the inner peripheral portion 22a of the packing 22 is formed so that the thickness dimension gradually decreases toward the inner peripheral side. That is, the inner peripheral portion 22a of the packing 22 has an inclined surface 22f. The inclined surface 22f of the packing 22 shown in FIG. 7(a) is an inclined surface facing the packing arrangement surface 10c side. Even in such a packing 22, the inner peripheral tip portion 22c of the inner peripheral portion 22a is formed so that it becomes thinner toward the inner peripheral side. Therefore, as shown in FIG. 7(b), the inner periphery 22a of the packing 22 can be prevented from partially protruding from the emission port 14 when it is compressed and deformed.

[0024] <Main unit 60> As shown in FIG. 2, the main unit 60 includes a main body structural part 60a having a bottomed cylindrical shape in a direction along the optical axis L. The opening of the main body structural part 60a faces the cover part 10a. One surface of the main body structural part 60a is fixed to the mounting part, and the cover part 10a is attached to the other surface. The cover part 10a is attached to the main body structural part 60a so as to cover the other surface side of the main body unit 60. The cylindrical part 60b constituting the side surface of the main body structural part 60a is shorter than the cover part 10a. A cover part mounting member 61a protruding toward the cover part 10a side is installed inside the cylindrical part 60b of the main body structural part 60a. The cover part mounting member 61a is installed in two places, and a pair of the cover part mounting members 61a are arranged to sandwich the lighting device 30 fixed to the center part of the main body structural part 60a.

[0025] The cover part attachment member 61a is formed so that the cross section perpendicular to the optical axis L is U-shaped. The tip of the cover part attachment member 61a on the cover part 10a side is formed with an attachment surface 61b that is provided parallel to the bottom surface 10e of the cover part 10a. A screw hole 61c is formed in the attachment surface 61b.

[0026] An attachment surface 61b formed on the tip of the cover attachment member 61a and the bottom surface 10e of the cover 10a are fastened together with a screw 10-1. A screw packing is sandwiched between the attachment surface 61b and the bottom surface 10e of the cover 10a, and the screw 10-1 is threaded through the screw packing into a screw hole 61c formed in the attachment surface 61b. With this configuration, the cover 10a is pulled toward the main unit 60 and fixed.

[0027] <Guide bracket 12> FIG. 8 is an explanatory diagram of a cross-sectional structure perpendicular to the optical axis L of the lighting device 1a according to the first embodiment. FIG. 8 shows a cross-section of the BB portion of FIG. 4. In the cross-section of FIG. 8, the cover part attachment member 61a is combined with the guide metal fitting 12. The cover part attachment member 61a is formed in a substantially rectangular parallelepiped shape with one side open, and has a U-shaped cross-sectional shape that is open toward the outside. The guide metal fitting 12 also has two plate-shaped guide parts 12b that extend toward the inside of the cover part 10a from both ends of the plate-shaped joint part 12a along the inner peripheral surface of the cover part 10a. That is, the guide metal fitting 12 also has a U-shaped cross-section that is open toward the inside of the cover part 10a in the cross-section shown in FIG. 8. The guide parts 12b are positioned so as to sandwich the cover part attachment member 61a from the outside from the side where the two side parts 61d are located.

[0028] When the lighting device 1a is assembled, the guide portion 12b of the guide metal fitting 12 and the two side portions 61d of the cover portion attachment member 61a are positioned with a slight gap between them. With this configuration, the rotational position of the cover portion 10a around the optical axis L of the main unit 60 is determined. Furthermore, the guide metal fitting 12 and the cover portion attachment member 61a are fitted together so as to be freely slidable along the optical axis L direction, that is, the direction in which the cover portion 10a is attached to the main unit 60. Therefore, the cover portion 10a is easily guided to a position where it can be attached to the main unit 60 with its rotational position determined relative to the main unit 60.

[0029] As shown in FIG. 2, the guide metal fitting 12 is formed so that the distance between the two guide parts 12b is wide at the end on the main unit 60 side, and the distance between the two guide parts 12b is narrow at the bottom surface 10e side of the cover part 10a. That is, the inner surface 12c of the guide part 12b is inclined with respect to the optical axis L. Also, the guide metal fitting 12 is disposed in a position close to the opening 16 of the cover part 10a and not in contact with the main unit 60. By configuring in this manner, the guide metal fitting 12 is guided by the cover part attachment member 61a when the cover part 10a and the main unit 60 are combined. Therefore, it is easy to align the cover part 10a and the main unit 60, and the lighting device 1a is easy to assemble.

[0030] It is difficult to visually confirm the position of the guide fitting 12 from the outside of the cover part 10a. In particular, when the cover part 10a is lifted and attached to the main unit 60 attached to the ceiling, it becomes even more difficult to confirm the position of the guide fitting 12. To solve this problem, a marking indicating the position of the guide fitting 12 may be provided on the outer surface of the cover side part 13 of the cover part 10a. The marking may be engraved by a press or the like, or may be provided by attaching a sticker, for example.

[0031] When attaching cover part 10a, cover part 10a is pushed up toward main unit 60 while aligning the markings on cover part 10a with the tip of cover part attachment member 61a. This makes it possible to easily align cover part 10a with main unit 60 without having to look into the position of guide metal fitting 12 from the opening 16 side of cover part 10a or to touch guide metal fitting 12 to check its position.

[0032] FIG. 9 shows a modified example of the guide metal fitting 12 of the lighting fixture 1a according to the first embodiment. The guide metal fitting 12 may be configured to be guided along the inner side surface of the cover part attachment member 61a formed in a U-shape in cross section. That is, the cover part attachment member 61a has a groove portion 62 for guiding the guide metal fitting 12, and is fitted with the guide metal fitting 12 so that the guide portion 12d is located inside the groove portion 62. At this time, the attachment surface 61b provided at the tip of the cover part attachment member 61a is formed to extend in the direction in which the optical axis L is located. That is, the attachment surface 61b is located on the optical axis L side from the viewpoint along the optical axis L relative to the groove portion 62. Note that in the first embodiment, the viewpoint along the optical axis L is the same as the viewpoint in the central axis direction of the lighting fixture 1a or the cover part 10a. As a result, the cover part attachment member 61a is configured so that the guide metal fitting 12 can be introduced into the groove portion 62 from the tip side. Also, the distance between the two guide portions 12b is preferably narrower on the opening 16 side of the cover portion 10a and wider on the bottom surface 10e side of the cover portion 10a.

[0033] <Effects of lighting fixture 1a> As described above, the lighting fixture 1a according to the first embodiment includes the light source unit 20 having the light source 5 and the optical control member 21 covering the light source 5, the cover unit 10a to which the light source unit 20 is fixed and in which the emission opening 14 that exposes the optical control member 21 is formed, and the packing 22 that is sandwiched between the light source unit 20 and the cover unit 20b and disposed around the emission opening 14. The packing 22 is formed in an annular shape, and the thickness of at least the inner peripheral portion 22a of the packing 22 is formed so as to become thinner from the outer peripheral side toward the inner peripheral side. With this configuration, the packing 22 of the lighting fixture 1a can be prevented from protruding from the light outlet 14, and the optical characteristics of the light emitted from the optical control member 21 and the aesthetics of the lighting fixture 1a are not deteriorated. In addition, the thickness of the inner peripheral portion 22a of the packing 22 is formed to become thinner from the outer peripheral side toward the inner peripheral side, so that the concentration of stress on the inner peripheral portion 22a due to pressing can be mitigated. Furthermore, since local deformation of the packing 22 can be suppressed, gaps are unlikely to occur between the packing 22 and the optical control member 21 and the packing arrangement surface 10c, and the packing 22 can improve the airtightness and waterproofness of the interior of the lighting fixture 1a.

[0034] Moreover, in lighting fixture 1a according to embodiment 1, optical control member 21 includes optical control section 21a that protrudes in the direction of optical axis L of light emitted from light source 5, and flange section 21b that is formed to protrude outward with respect to optical axis L. Inner periphery section 22a of packing 22 is sandwiched and compressed between flange section 21b and cover section 10a. With this configuration, the entire circumference of inner periphery 22a of annular packing 22 is sandwiched and compressed between optical control section 21a and cover section 10a. Therefore, the path from the outside of lighting fixture 1a through light outlet 14 to the inside of lighting fixture 1a is blocked by inner periphery 22a of packing 22. This improves the airtightness and waterproofness of the inside of lighting fixture 1a.

[0035] Furthermore, the light source section 20 includes a holder 9 to which the light source 5 and the optical control member 21 are fixed. An outer peripheral portion 22d of the packing 22 is sandwiched and compressed between the holder 9 and the cover section 10a. With this configuration, the outer peripheral portion of packing 22 closes the gap between holder 9 and cover portion 10a, thereby improving the airtightness and waterproofness of the inside of lighting fixture 1a.

[0036] Further, the cover portion 10a has a step formed around the emission port 14, and the packing 22 is disposed inside the step. This configuration makes it easier to position the packing 22, improving the placement accuracy of the packing 22 relative to the optical control member 21. Therefore, the packing 22 is placed at a predetermined position between the light source unit 20 and the cover unit 10a, and the gap between the light source unit 20 and the cover unit 10a can be properly closed. This improves the airtightness and waterproofness of the inside of the lighting fixture 1a.

[0037] The cover portion 10a is formed in a cylindrical shape with a bottom, with the light outlet 14 provided on the bottom surface 10e, and the light source portion 20 is fixed to the bottom surface 10e inside the cover portion 10a. With this configuration, lighting device 1a can easily improve the airtightness and waterproofness of the inside of bottomed cylindrical cover portion 10a by closing the gap between light source portion 20 and cover portion 10a.

[0038] The lighting fixture 1a according to the first embodiment includes a cover portion 10a provided with a light source, a main unit 60 having one surface attached to a mounting portion and an open other surface, and a cover portion mounting member 61a provided to protrude from the other surface side of the main unit 60 and to which the cover portion 10a is fixed at its tip. The cover portion 10a includes a cylindrical cover side portion 13 and a bottom surface 10e having an outlet 14 through which light from the light source 5 is emitted. The cover portion 10a is mounted on the main unit 60 so as to cover the other surface of the main unit 60 along the central axis of the cover side portion 13. The cover side portion 13 includes a guide fitting 12 protruding toward the inside of the cover portion 10a fixed to the inner peripheral surface. The guide fitting 12 is fitted into the cover portion mounting member 61a and configured to be slidable in a direction along the central axis of the cover side portion 13. With this configuration, the cover part 10a can be easily positioned relative to the main unit 60 in the rotational direction around the optical axis L. This makes it possible to prevent twisting of the electric wires connecting the cover assembly 10 and the main unit 60, and therefore the lighting device 1a can prevent breakage of the electric wires and poor connection.

[0039] The guide fitting 12 also includes two guide portions 12b extending from the inner surface of the cover side surface portion 13 toward the inside of the cover portion 10a in a cross section perpendicular to the central axis of the cover side surface portion 13. The cover portion attachment member 61a is located between the two guide portions 12b. Further, the distance between the two guide portions 12b is wider on the main unit 60 side and narrower on the bottom surface 10e side. Alternatively, the guide fitting 12 includes a guide portion 12b extending from the inner surface of the cover side surface portion 13 toward the inside of the cover portion 10a in a cross section perpendicular to the central axis of the cover side surface portion 13. The cover portion attachment member 61a includes a groove portion 62 that is open toward the inner surface of the cover side surface portion 13 in a cross section perpendicular to the central axis of the cover side surface portion 13. The guide portion 12b is located inside the groove portion 62. The cover portion attachment member 61a includes an attachment surface 61b to which the cover portion 10a is fixed at its tip. The attachment surface 61b is located closer to the central axis than the groove portion 62 when viewed in the direction of the central axis of the cover side surface portion 13. As described above, the guide using the guide metal fitting 12 and the cover part attachment member 61a can take other forms as necessary. In other words, the shapes of the guide metal fitting 12 and the cover part attachment member 61a of the lighting fixture 1a may be changed depending on the arrangement of the fixing part between the cover part 10a and the cover part attachment member 61a, and the arrangement of the lighting device 30 or the light source part 20 inside.

[0040] Furthermore, cover portion 10a may have markings on its exterior surface that indicate the positions of guide fittings 12. This makes it easier to align main unit 60 and cover portion 10a in lighting fixture 1a, improving assembly workability.

[0041] <Modification of lighting fixture 1a> Fig. 10 is a perspective view of lighting fixture 101a which is a modified example of lighting fixture 1a according to embodiment 1. Fig. 11 is an exploded perspective view of main body unit 160 which constitutes lighting fixture 101a in Fig. 10. Fig. 12 is an exploded perspective view of cover assembly 110 which constitutes lighting fixture 101a in Fig. 10. Lighting fixture 101a which is a modified example of lighting fixture 1a is a lighting fixture which is embedded in a ceiling, for example, and has a different structure of cover part 110a and main body unit 160 from lighting fixture 1a.

[0042] The main body unit 160 of the lighting fixture 101a, which is a modified example of the lighting fixture 1a, is a deep, bottomed cylindrical shape, unlike the main body structure 60a constituting the main body unit 60 of the lighting fixture 1a. Accordingly, the cover part attachment member 161a that fixes the cover part 110a is composed of an L-shaped metal fitting. The cover part attachment member 161a is fixed to the inner surface of the cylindrical part of the main body structure 160a, and the attachment surface 161b protrudes from the opening of the main body structure 160a.

[0043] Cover part 10a of lighting fixture 1a was a cylindrical shape with a deep bottom that was deep enough to cover lighting device 30 with a cylindrical body, but cover part 110a of lighting fixture 101a is formed into a shallow cylindrical shape with a bottom. However, the structure for fixing other parts such as light source unit 20 to cover part 110a is similar to that of cover assembly 10 according to embodiment 1. In lighting fixture 101a of the modified example as well, packing 22 disposed between light source unit 20 and cover part 110a is prevented from protruding from light outlet 14, thereby improving the airtightness and waterproofness of the inside of lighting fixture 101a.

[0044] The lighting fixture 101a has an advantage that it is easier to assemble than the lighting fixture 1a because the internal structure of the cover assembly 110 is easier to see. Note that the lighting fixture 101a does not include the guide fitting 12 provided on the cover part 10a of the lighting fixture 1a. [Explanation of symbols]

[0045] 1a lighting fixture, 5 light source, 9 holder, 9a engagement portion, 9b L-shaped rib, 10 cover assembly, 10-1 screw, 10-3 screw, 10a cover portion, 10b surface, 10c packing arrangement surface, 10d connection surface, 10e bottom surface, 11 cover front portion, 12 guide fitting, 12a joint portion, 12b guide portion, 12c inner surface, 12d guide portion, 13 cover side portion, 14 emission port, 15 display port, 16 opening, 20 light source portion, 20b cover portion, 21 optical control member, 21a optical control portion, 21b flange portion, 22 packing, 22a inner periphery portion, 22b thick portion, 22c inner periphery side tip portion, 22d outer periphery portion, 22e connection portion, 22f inclined surface, 23 Monitor gasket, 27 heat sink, 30 lighting device, 40 power terminal block, 50 housing, 60 main unit, 60a main body structure, 60b tube portion, 61a cover portion mounting member, 61b mounting surface, 61c screw hole, 61d side portion, 80 top surface, 90 waterproof gasket, 101a lighting fixture, 110 cover assembly, 110a cover portion, 122 gasket, 122a inner circumference portion, 160 main unit, 160a main body structure, 161a cover portion mounting member, 161b mounting surface, L optical axis.

Claims

1. an optical control member through which light emitted from the light source passes; a cover portion having an exit port for exposing the optical control member; a packing that is sandwiched between the optical control member and the cover portion and disposed around the light exit port, The packing is formed in an annular shape, The inner periphery of the packing is In a state before the optical control member is fixed to the cover portion, the surface on the light source side extends in a direction perpendicular to the optical axis direction of the light source, the surface on the cover portion side has an inclined surface that is inclined toward the light source side toward a tip on the inner periphery side, and is formed so that the thickness becomes thinner toward the inner periphery side, In a state in which the optical control member is fixed to the cover portion, A lighting device, wherein the surface on the light source side is shaped to incline toward the light source toward the tip on the inner periphery side in accordance with the shape of the optical control member.

2. The optical control member is an optical control unit disposed to protrude from the light exit port of the cover unit in an optical axis direction of the light source; a flange portion formed to protrude outward relative to the optical axis of the light source, The packing is The lighting fixture according to claim 1 , wherein the optical control member is disposed so as to surround the periphery of the optical control portion and is sandwiched between the flange portion and the cover portion of the optical control member.

3. The cover portion is A step is formed around the emission port, The packing is The lighting fixture according to claim 1 or 2, which is arranged inside the step.

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