JP7854867B2 - Lighting fixture telescopic structure, lighting fixture, and lighting device - Google Patents

Description

This disclosure relates to a luminaire extension/contraction structure that accommodates the expansion and contraction of its components, a luminaire, and a lighting device using the luminaire.

Conventionally, light source units and lighting fixtures are known that can suppress the generation of excessive stress at the fixing points between structural components when the structural components expand or contract in response to changes in ambient temperature (see, for example, Patent Document 1). The light source unit of the lighting fixture disclosed in Patent Document 1 comprises a light source, a long support member that supports the light source, a waterproof case that houses the support member supporting the light source, and a plurality of fasteners that fix the support member to the waterproof case within the waterproof case. The plurality of fasteners are arranged at intervals along the longitudinal direction of the support member, and at least one of the plurality of fasteners is attached to the support member so as to be movable along the longitudinal direction of the support member.

The light source unit described in Patent Document 1 absorbs the difference in expansion and contraction between the support member and the waterproof case due to temperature changes by having a fixing device move relative to the support member. This configuration prevents excessive pressure from being generated at the fixing point between the support member and the waterproof case, thereby preventing malfunctions such as damage to the components caused by temperature changes.

Patent No. 6206811

The light source unit described in Patent Document 1 is a technology that suppresses component damage caused by temperature changes using a moving mechanism installed within the light source unit, but it had the problem of having a complex internal structure.

This disclosure was made in view of the above-mentioned problems, and aims to provide a luminaire extension structure, luminaire, and lighting device that can suppress damage to components due to environmental changes such as temperature, with a simple structure.

The lamp extendable structure according to this disclosure comprises a long base, a cylindrical outer shell covering the base and having an opening formed on the longitudinal end face of the base, a lid attached to the end of the outer shell so as to cover the opening when the end of the outer shell is inserted into the insertion part, and a sealing device positioned between the outer shell and the lid in the longitudinal direction and sealing the opening at the end of the outer shell, wherein the sealing device clamps the end of the outer shell in the circumferential direction in a second direction perpendicular to the first direction which is the longitudinal direction and is positioned in the insertion part in that state, and is formed integrally with the outer shell sealing part and extends beyond the opening from the outer shell sealing part The seal device comprises a sealing portion that seals the inside in the second direction, and in the first direction, a seal device deformation space is provided between the lid and the sealing portion to allow elastic deformation of the seal device due to movement of the end portion within the insertion portion caused by environmental changes , the outer sealing portion of the seal device has an outer peripheral portion that contacts the outer surface of the end portion of the outer casing, an inner peripheral portion that contacts the inner surface of the end portion of the outer casing, and a connecting portion that contacts the end surface of the outer casing in the first direction and connects the outer peripheral portion and the inner peripheral portion, and the insertion portion has an end space between the lid and the connecting portion of the seal device in the first direction that allows movement of the outer sealing portion along the first direction .

The luminaire relating to this disclosure comprises the above-described telescopic luminaire structure and a light source unit positioned on the base.

The lighting device relating to this disclosure comprises the above-mentioned luminaire and a lighting fixture installed on the mounting portion, to which the luminaire is detachably attached.

According to this disclosure, for example, when the end of the outer casing moves within the insertion portion due to environmental changes such as temperature, the elastic deformation of the sealant resulting from the movement of the end occurs within the sealant deformation space. Therefore, excessive stress is not applied to the sealant, and damage to the sealant can be suppressed. Furthermore, since it is only necessary to provide a sealant deformation space between the lid and the sealing portion to suppress damage to the components due to environmental changes, a simple structure can be used to suppress damage to the components due to environmental changes.

This is a perspective view of a lighting device according to an embodiment. This is a segmented perspective view showing the lighting fixture and luminaire of the lighting device according to the embodiment. This is an exploded perspective view of the lighting device according to the embodiment. This is an enlarged perspective view of one end of the luminaire according to the embodiment. This is a partially disassembled perspective view of one end of the luminaire according to the embodiment. This is an exploded perspective view of one end of the luminaire according to the embodiment. This is an exploded perspective view showing the configuration inside the light-transmitting cover of the light fixture according to the embodiment. This is a cross-sectional view along the longitudinal direction X at one end of the luminaire according to the embodiment. This is a perspective view showing a cross-section along the longitudinal direction X at one end of the luminaire according to the embodiment. This is a perspective view showing a sealing device for a lighting fixture according to an embodiment. This is a cross-sectional view of the surrounding structure, including the sealing device, of the luminaire according to the embodiment. This is a cross-sectional view illustrating the structure around the end cover of a lighting device according to an embodiment. This is an enlarged schematic diagram illustrating the operation of the telescopic structure of the light fixture according to the embodiment. This is an enlarged schematic diagram illustrating the operation of the telescopic structure of the light fixture according to the embodiment. This is a perspective view of the end of a lighting device equipped with a sealing device according to a modified example 1 of the embodiment. This is a perspective view of a sealing device according to a modified example 1 of the embodiment. This is a perspective view of a modified example 2 of the embodiment of the sealing device. This is a cross-sectional view of a modified example 3 of the embodiment of the sealing device. This is a cross-sectional view of a modified example 4 of the embodiment of the sealing device. This is a cross-sectional view of a modified example 5 of the embodiment. This is a cross-sectional view of a modified example 6 of the embodiment of the sealing device.

The following description of the luminaire extension structure, luminaire, and lighting device according to the embodiment will be given with reference to the drawings. In each figure, the same or corresponding components are denoted by the same reference numerals, and repetition of the description may be omitted.

Furthermore, the luminaire extension structure, luminaire, and lighting device relating to this disclosure are not limited to the embodiments described below, and can be modified in various ways without departing from the spirit of this disclosure. Also, the luminaire extension structure, luminaire, and lighting device shown in the drawings are merely examples of how this disclosure applies, and the scope of application of this disclosure is not limited by the luminaire extension structure, luminaire, and lighting device shown in the drawings.

In each drawing, the relative dimensions or shapes of the components may differ from those of the actual parts. Furthermore, in the following explanation, directions, or positions such as "top," "bottom," "left," "right," "front," "back," "front," and "back" may be indicated. These notations are used for convenience to facilitate understanding of the explanation and do not limit the orientation, direction, or position of the light fixture, lighting device, or its constituent parts.

Embodiment.
<Configuration of Lighting Device 1>
Figure 1 is a perspective view of the lighting device 1 according to the embodiment. Figure 2 is a divided perspective view of the lighting device 1 according to the embodiment, showing the lighting fixture 2 and the luminaire 3 separated. Figure 3 is an exploded perspective view of the lighting device 1 according to the embodiment. Figure 4 is an enlarged perspective view of one end 3A of the luminaire 3 according to the embodiment. Figure 5 is a partially exploded perspective view of one end 3A of the luminaire 3 according to the embodiment. Figure 6 is an exploded perspective view of one end 3A of the luminaire 3 according to the embodiment. Figure 7 is an exploded perspective view showing the configuration inside the translucent cover 30 of the luminaire according to the embodiment. Figure 8 is a cross-sectional view of one end 3A of the luminaire 3 according to the embodiment along the longitudinal direction X. Figure 9 is a perspective view showing a cross-section of one end 3A of the luminaire 3 according to the embodiment along the longitudinal direction X.

In the following description, the direction along the longitudinal direction of the lighting device 1 is defined as the longitudinal direction X. The direction perpendicular to the longitudinal direction X and parallel to the longitudinal direction X is defined as the transverse direction Y. The direction perpendicular to both the longitudinal direction X and the transverse direction Y is defined as the vertical direction Z. Furthermore, in the longitudinal direction X, the direction toward the longitudinal end is defined as the end direction X1. The direction opposite to the end direction X1 and toward the longitudinal center is defined as the center direction X2. Furthermore, in the vertical direction Z, the direction toward the building section 9 (i.e., the mounting section such as the ceiling or wall) to which the lighting device 1 is attached is defined as the upward direction Z1. The direction opposite to the upward direction Z1 and toward the illuminated space from which light is emitted from the lighting device 1 is defined as the downward direction Z2. Here, the upward direction Z1 is the direction in which the luminaire 3 is attached to the lighting fixture 2, and the downward direction Z2 is the direction in which the luminaire 3 is removed from the lighting fixture 2.

The lighting device 1 in this embodiment includes a lighting fixture 2 attached to a structural part 9 such as a ceiling or wall, and a light fixture 3 that is detachably attached to the lighting fixture 2. The lighting device 1 also includes a light fixture extension structure 100, which will be described later. In this embodiment, a so-called trough-type lighting fixture 2 is shown as an example.

(Lighting fixture 2)
In this embodiment, the fixture body 20 constituting the lighting fixture 2 is formed by bending a metal plate. As shown in Figures 1 to 3, the fixture body 20 has a fixture bottom portion 21, two fixture side portions 22 that form a pair, and two fixture end portions 24 that form a pair. The fixture bottom portion 21 is formed in a long, flat shape, and the two fixture side portions 22 that form a pair are arranged at both ends of the fixture bottom portion 21 in the short direction Y. The two fixture end portions 24 that form a pair are arranged at both ends of the fixture bottom portion 21 in the longitudinal direction X. Knockouts 26 are formed in the fixture end portions 24 and are removed when inserting the luminaire wires 83, etc., which will be described later. Although the knockouts 26 are formed in the fixture end portions 24 here, they may also be formed in the fixture side portions 22. Also, a conduit may be installed in the through hole formed by removing the knockouts 26.

The mounting section 29 is a housing section that accommodates a portion of the mounted luminaire 3. The mounting section 29 is formed in a concave shape by the fixture bottom surface 21, a pair of fixture side surfaces 22, and a pair of fixture end surfaces 24 of the fixture body 20. Therefore, the mounting section 29 forms a space enclosed by the fixture bottom surface 21, the pair of fixture side surfaces 22, and the pair of fixture end surfaces 24 of the fixture body 20. Here, the portion of the luminaire 3 housed in the mounting section 29 is the non-illuminated portion, not the illuminated side. Furthermore, the opening-side end surface 23 located at the lower end of the fixture body 20 is an open portion not blocked by the fixture body 20. The opening-side end surface 23 serves as the mounting opening for attaching and detaching the luminaire 3 to and from the mounting section 29 of the lighting fixture 2.

As shown in Figure 2, the lower end of the fixture side portion 22 is bent or hemmed inward toward the mounting portion 29. These processes reduce the gap between the fixture side portion 22 and the translucent cover 30 of the luminaire 3 (described later), improving the aesthetic appearance and improving the efficiency of the lighting device 1 by suppressing light entering the mounting portion 29. A gap of approximately 0.1 to 2.5 mm may be provided between the lower end of the fixture side portion 22 and the luminaire 3, considering the ease of installation when attaching and detaching the luminaire 3 to the lighting fixture 2.

As shown in Figure 2, connecting portions 27 are formed at both ends of the opening-side end 23 of the fixture body 20 in the longitudinal direction X. The luminaire 3 is attached to the connecting portions 27. In this embodiment, the connecting portions 27 are integrally formed with the fixture end 24 and are formed by bending from the opening-side end 23 toward the center in the longitudinal direction X2. The screw holes 28 formed in the connecting portions 27 are holes through which connecting screws 88 (see Figure 3), described later, attached to the luminaire 3, are screwed in. The luminaire 3 is fixed to the lighting fixture 2 by screwing it in with the connecting screws 88.

As shown in Figure 2, guide portions 25 are arranged along the Z direction at both ends of the mounting portion 29 in the longitudinal direction X. In this embodiment, the guide portion 25 is plate-shaped, and the end opposite to the fixture end portion 24 at the connecting portion 27 is bent toward the fixture bottom portion 21. The guide portion 25 functions as a guide to guide the luminaire 3 when it is attached to the lighting fixture 2. Furthermore, the guide portion 25 functions as a stopper to prevent the fixing screw 67, described later, from coming loose when the luminaire 3 is attached to the lighting fixture 2.

(Lighting 3)
The luminaire 3 constitutes the lighting device 1 by being attached to the lighting fixture 2. The luminaire 3 is formed in an elongated shape and is used by being attached to the lighting fixture 2. In this embodiment, the luminaire 3 is attached to the connecting portion 27 of the lighting fixture 2 at both ends in the longitudinal direction X of the lighting fixture 2 by connecting screws 88, which will be described later. As shown in Figures 2 and 3, the luminaire 3 of this embodiment mainly has a light-transmitting cover 30, an end cover 40, a sealant 50, and a light source portion 70, etc.

(Translucent cover 30)
The translucent cover 30 is a cylindrical outer shell made of a translucent material that transmits at least visible light, and it houses and protects the base 60, light source unit 70, and control unit 80, etc., described later, within its internal space. The translucent cover 30 can be formed using glass, polycarbonate, or resin material such as acrylic. In addition, the portion of the translucent cover 30 that is exposed to the outside from the mounting portion 29 also serves as an aesthetic design portion. The translucent cover 30 of this embodiment can be manufactured, for example, by extruding a cylindrical member and cutting it to the required length according to the product specifications.

In the luminaire 3 of this embodiment, as shown in Figure 1, the exposed portion 31 of the translucent cover 30 that is exposed to the outside from the mounting portion 29 becomes the outer shell portion (outer wall portion) that covers the irradiation side of the light source portion 70 and the surface of the base 61 described later. The translucent cover 30 has a shape in which four planes are connected by curved surfaces, and as shown in Figure 3, it comprises a main surface portion 30a which is the side from which light is emitted, a back surface portion 30b which is the side of the lighting fixture 2, and two cover side portions 30c which connect the main surface portion 30a and the back surface portion 30b. The translucent cover 30 is constructed by connecting adjacent portions of the main surface portion 30a, the two cover side portions 30c, and the back surface portion 30b with curved surfaces or the like. Note that all or part of the four planes constituting the translucent cover 30 may be curved surfaces. Also, the cross-sectional shape of the translucent cover 30 may be a circle including an ellipse, or a polygonal cylindrical shape with three or more sides. The translucent cover 30 may have properties such as light diffusion and wavelength discrimination, depending on the product specifications. Furthermore, the portion of the translucent cover 30 that is not exposed to the outside may be formed using a material with properties such as reflectivity and light shielding.

As shown in Figures 5 and 6, the translucent cover 30 covers the light-emitting surface of the light-emitting element 71 placed on the base 60, and has an opening formed at the end 33 in the first direction along the longitudinal direction X of the base 60. In other words, the translucent cover 30 is a long, hollow body with at least one end 33 open, and is an outer casing that houses the substrate 72 on which the light-emitting element 71 is mounted, as shown in Figures 4 and 8. The end 33 is the portion of the translucent cover 30 at both ends in the longitudinal direction X of the translucent cover 30, and is the portion to which the end cover 40 is fitted. The end 33 is the portion covered by the end cover 40, which is the end lid.

As shown in Figure 5, the translucent cover 30 is cylindrical in shape, having openings 37 at both end faces 34 in the longitudinal direction X. The portion of the translucent cover 30 including the end faces 34 is referred to as the end 33. The end 33 is the portion to which the end cover 40 and the sealant 50 are fitted, and is the portion covered by the end cover 40, which is the end lid. The translucent cover 30 expands and contracts along the longitudinal direction X due to changes in the ambient temperature where the lighting device 1 is installed and used, or due to temperature changes between when the light fixture 3 is turned on and when it is turned off. The end faces 34 are free ends that can move along the first direction, which is the longitudinal direction X, together with the sealant 50 as the translucent cover 30 expands and contracts. Strictly speaking, the translucent cover 30 also expands and contracts along directions other than the "longitudinal direction X", but the light fixture 3 according to this embodiment has a light fixture expansion and contraction structure 100 that allows the translucent cover 30 to expand and contract along the "longitudinal direction X". Details of the luminaire extension structure 100 will be described later.

The translucent cover 30 is fitted to the end cover 40 with the sealant 50 in between. The end 33 of the translucent cover 30 is fitted to the sealant 50, and then fitted to the end cover 40. In other words, the sealant 50 is directly fitted to the end 33 of the translucent cover 30. As described above, the translucent cover 30 is formed in a cylindrical shape, and the end cover 40 is configured to fit around the periphery of the cylindrical opening 37.

(End cover 40)
The end cover 40 is a lid that closes the opening 37 at the end face 34 of the translucent cover 30. The end cover 40 is attached to both ends of the translucent cover 30 in the longitudinal direction X. The end cover 40 is attached to the end 33 of the translucent cover 30 by sandwiching the sealant 50, which is an elastic member, between it and the end 33 of the translucent cover 30. The end cover 40 is attached to the translucent cover 30 in a state that it covers the end 33 of the translucent cover 30 that forms the opening 37. The end cover 40 is attached to the translucent cover 30 by pressing the sealant 50, which is an elastic member, against the end 33.

(Sealing tool 50)
The sealant 50 is an elastic member positioned between the end cover 40 and the translucent cover 30 at both ends in the longitudinal direction X. The sealant 50 is attached to the end 33 of the translucent cover 30 and closes the opening 37 at the end 33. The sealant 50 is manufactured using a resin material and is an elastically deformable sealing member (gasket, packing, etc.). Therefore, the sealant 50 is sandwiched between the end covers 40 and the translucent cover 30 in the longitudinal direction X, sealing both ends of the translucent cover 30 in the longitudinal direction X. The sealant 50 is formed using a resin material to be elastically deformable and adheres tightly to the translucent cover 30 and the end cover 40. In this way, the sealant 50 adheres tightly to the translucent cover 30 and the end cover 40, creating a sealed structure inside the translucent cover 30.

Figure 10 is a perspective view showing the sealant 50 of the lamp 3 according to the embodiment, where (a) is a view of the sealant 50 from the translucent cover 30 side, and (b) is a view of the sealant 50 from the end cover 40 side. The sealant 50 has a cover sealing portion 51, a sealing portion 52, a boss sealing portion 53, a protruding portion 54, and a wire sealing portion 55. The sealant 50 is integrally formed with the cover sealing portion 51, the sealing portion 52, the boss sealing portion 53, the protruding portion 54, and the wire sealing portion 55. The sealant 50 is manufactured by a molding method such as direct pressure molding, direct pressure injection molding, or injection molding.

As shown in Figures 8 and 9, the cover sealing portion 51 is a cylindrical portion having a groove-shaped insertion part into which the cylindrical end portion 33 of the translucent cover 30 is inserted. The cover sealing portion 51 is an outer sealing portion that clamps the end portion 33 of the translucent cover 30, which is the outer casing, in a second direction perpendicular to the first direction, which is the longitudinal direction X, in the circumferential direction. The cover sealing portion 51 has an outer circumferential portion 510, an inner circumferential portion 511, and a connecting portion 512. Here, the second direction includes the short direction Y and the vertical direction Z, encompassing all directions (360°) intersecting the longitudinal direction X.

The outer periphery 510 is an annular portion that contacts the outer surface 35 of the end 33 of the translucent cover 30 from the outer periphery side, as shown in Figure 8, and extends in the X direction. The inner periphery 511 is located inside the outer periphery 510. The inner periphery 511 is an annular portion that contacts the inner surface 36 of the end 33 of the translucent cover 30 from the inner periphery side, and extends in the X direction. The connecting portion 512 is a portion that connects the X1-side end face of the outer periphery 510 and the X1-side end face of the inner periphery 511, and is an annular plate-like portion extending in the YZ plane. The connecting portion 512 is the portion that contacts the end face 34 (see Figure 5) of the translucent cover 30 inserted into the cover sealing portion 51.

The cover sealing portion 51, comprised of an outer peripheral portion 510, an inner peripheral portion 511, and a connecting portion 512, forms a groove-shaped insertion portion open to the X2 side. The cylindrical end portion 33 of the translucent cover 30 is inserted into this insertion portion, and the end portion 33 is tightly clamped in the circumferential direction. As shown in Figure 8, the cover sealing portion 51 is the portion sandwiched between the first cover outer wall portion 412 and the second cover inner wall portion 420 of the end cover 40 when the sealing device 50, the end cover 40, and the translucent cover 30 are engaged.

Figure 11 is a cross-sectional view of the surrounding structure including the sealant 50 of the lamp fixture 3 according to the embodiment. Figure 11 shows a cross-section of the surrounding structure including the sealant 50 along the longitudinal direction X. Figure 11(a) shows the lamp fixture 3 in an unassembled state, and Figure 11(b) shows the lamp fixture 3 assembled, with the outer periphery 510 and inner periphery 511 of the sealant 50 in close contact with the translucent cover 30 and the end cover 40. As shown in Figure 11, the sealant 50 has protrusions 513 on the outer periphery 510 and the inner periphery 511.

The outer periphery 510 has a protrusion 513 formed on its inner surface 515, which contacts the outer surface 35 of the translucent cover 30, so as to project toward the outer surface 35. Furthermore, the outer periphery 510 has a protrusion 513 formed on its outer surface 516, which contacts the first end cover 41, so as to project toward the first end cover 41.

The inner circumference 511 has a protrusion 513 formed on the outer surface 518 of the inner circumference that contacts the inner surface 36 of the translucent cover 30, projecting toward the inner surface 36. Furthermore, the inner circumference 511 has a protrusion 513 formed on the inner surface 517 of the inner circumference that contacts the second end cover 42, projecting toward the second end cover 42.

The protrusions 513 are formed in an annular shape on the outer circumference 510 and the inner circumference 511. Furthermore, the protrusions 513 on the inner surface 515 of the outer circumference and the protrusions 513 on the inner surface 517 of the inner circumference are formed so that their respective tips (centers of the protrusions) are offset. Similarly, the protrusions 513 on the outer surface 516 of the outer circumference and the protrusions 513 on the outer surface 518 of the inner circumference are formed so that their respective tips (centers of the protrusions) are offset. And, the protrusions 513 on the outer surface 516 and the protrusions 513 on the inner surface 515 of the outer circumference are formed so that their respective tips (centers of the protrusions) are offset. The protrusions 513 on the outer surface 518 and the protrusions 513 on the inner surface 517 of the inner circumference are formed so that their respective tips (centers of the protrusions) are offset.

The cover sealing portion 51 has protrusions 513 formed on its outer circumference 510 and inner circumference 511, resulting in a roughly wavy cross-section when cut in the XZ plane. This shape of the sealing device 50 is an example of a shape that improves the adhesion between the translucent cover 30 and the end cover 40 and the cover sealing portion 51, as well as the ease of assembly of the lamp 3.

The height dimension T2 of the protrusion 513 is determined considering the adhesion between the translucent cover 30 and the end cover 40 and the sealant 50, as well as the ease of assembly of the lamp 3. In the undeformed state, the height dimension T2 of the protrusion 513 is less than or equal to the thickness dimension T1 of the undeformed outer circumference 510 and inner circumference 511 (T2 ≤ T1). Furthermore, the height dimension T2 of the undeformed protrusion 513 is less than or equal to the distance T3 between the undeformed outer circumference 510 and inner circumference 511 (T2 ≤ T3). Also, the distance T3 between the undeformed outer circumference 510 and inner circumference 511 is less than or equal to the thickness dimension T4 of the end 33 of the translucent cover 30 (T3 ≤ T4).

The sealant 50 is shaped to cover the entire opening 37 formed at the end 33 of the translucent cover 30. To maintain the waterproof properties of the light fixture 3, it is sufficient to maintain a tight seal between the translucent cover 30 and the sealant 50.

The cover sealing portion 51 maintains its waterproofness in an elastically deformed state when the lamp 3 is assembled. From the viewpoint of maintaining waterproofness, the amount of deformation (amount of crushing due to compression) of the cover sealing portion 51 is selected to be 50% or less of the thickness dimension in the undeformed state.

The sealing portion 52, as shown in Figure 10, is a plate-like portion extending in the YZ plane, formed to close the inside of the inner circumference 511 of the cover sealing portion 51. The sealing portion 52 is integrally formed with the cover sealing portion 51 and seals the inside of the opening 37 of the translucent cover 30 in the Z direction (second direction) from the cover sealing portion 51. As shown in Figure 8, the sealing portion 52 is located between the fixing portion 64b of the fixing device 64 (described later) and the second inner cover wall portion 420 of the end cover 40. The sealing portion 52 has three openings, and a boss sealing portion 53, a protruding portion 54, and a wire sealing portion 55 are formed, projecting perpendicularly from the inner circumference of each opening towards the X1 side relative to the sealing portion 52.

The boss sealing portion 53 is a cylindrical portion that protrudes toward X1 from the inner peripheral edge of the opening of the sealing portion 52, as shown in Figure 10. As shown in Figure 8, when the sealing device 50 and the fixing device 64 are engaged, the boss 65, described later, which protrudes toward X1 from the fixing portion 64b of the fixing device 64, is inserted into the boss sealing portion 53. A screw insertion hole for a fixing screw 67 is formed at the tip of the boss sealing portion 53, and the fixing screw 67 can be screwed into the screw hole 66 formed at the tip of the boss 65. Although only one boss sealing portion 53 is provided here, the number of boss sealing portions 53 may be two or more.

As shown in Figure 10, the protruding portion 54 has a protruding peripheral portion 541, which is a circumferential wall portion that protrudes in the direction X1 from the inner peripheral edge of the opening of the sealing portion 52, and a protruding end portion 540, which is a closing wall that closes the tip of the protruding peripheral portion 541. The interior of the protruding portion 54 is hollow, as shown in Figure 8. The ends of the light source unit 70 and the base 60 in the longitudinal direction X are housed in the hollow interior of the protruding portion 54. The protruding portion 54 is provided to prevent the light source unit 70 from contacting the light-transmitting cover 30 when the adhesive 73 bonding the light source unit 70 and the base 60 deteriorates due to long-term use of the lighting device 1, causing the light source unit 70 to detach from the base 60 and fall.

As shown in Figure 10, the wire sealing portion 55 is a rectangular prism portion that protrudes in the direction of X1 from the inner peripheral edge of the opening of the sealing portion 52, and has a wire insertion hole 551 through which the power wire 84, ground wire 85, and control wire 86 pass.

(Connector 87)
As shown in Figure 2, the connector 87 is provided at both ends of the luminaire 3 in the longitudinal direction X, and is a mounting bracket for attaching the luminaire 3 to the lighting fixture 2. The connector 87 is positioned outside the end cover 40 in the longitudinal direction X of the luminaire 3, with a portion fixed to the base 60 and the other portion fixed to the fixture end 24 of the lighting fixture 2. Specifically, the connector 87 is attached and fixed to the fixing device 64 of the base 60 using fixing screws 67, with the surface of the connector 87 extending in the YZ plane direction in contact with the end face on the X1 side of the boss 65. As shown in Figures 8 and 9, the connector 87 has a through hole 871 through which the connecting screw 88 passes. As shown in Figure 9, the connector 87 is fixed to the lighting fixture 2 by screwing the connecting screw 88, which has passed through the through hole 871, into the screw hole 28 of the fixture end 24.

The connector 87 is not directly fixed to the end cover 40 using screws or the like. The connector 87 is positioned and indirectly fixed to the end cover 40 via a sealing device 50 that tightly contacts the boss 65 of the fixing device 64.

In this embodiment, the connector 87 is formed by bending a metal plate. However, the connector 87 is not limited to being formed from a bent metal plate; for example, it may be formed using other materials such as resin or ceramic, or by other methods such as extrusion molding or additive manufacturing.

(Base 60)
As shown in Figure 3, the base 60 is a component that fixes the light source unit 70 and the control unit 80, etc., within the space inside the translucent cover 30. The base 60 is also a component that is fixed to the end covers 40 and connectors 87 attached to both ends of the translucent cover 30. The base 60 has a base 61 and two fixing devices 64, and the base 61 and the two fixing devices 64 are fixed to each other using fixing screws 68. The base 60 is housed in the translucent cover 30. Then, as shown in Figures 8 and 9, the base 60 is fixed to the end covers 40 and connectors 87 by fixing screws 67. The base 60 is connected to the translucent cover 30 via a sealing device 50 and end covers 40 that are fitted to the base 60. Therefore, the base 60 is not directly fixed to the translucent cover 30.

The base 61 is the main part of the base 60, and the light source unit 70 and control unit 80, etc., are attached to it. In this embodiment, the base 61 is formed by bending a metal plate. However, the base 61 is not limited to being formed by bending a metal plate; for example, it may be formed using a material other than metal, such as resin or ceramic, or it may be formed by other methods such as extrusion molding or additive manufacturing. Although not shown in the figures, the base 61 may be surface-treated or functional members may be laid on the base 61 to improve heat dissipation efficiency (thermal emissivity) or light utilization efficiency (reflectivity).

As shown in Figure 7, the base 61 has a base portion 62 and a side portion 63. The base portion 62 is formed from a long, flat plate, and as shown in Figure 8, the light source portion 70 is positioned and fixed to the surface, which is the side facing the light source. The base portion 62 and the light source portion 70 are fixed together with adhesive 73. Note that the fixing of the base portion 62 and the light source portion 70 is not limited to adhesive 73; fixing members such as screws may also be used. Furthermore, as shown in Figure 3, a control unit 80, such as a power supply unit, is attached to the back surface of the base portion 62, which is the side facing the lighting fixture 2, using fixing screws 81.

The side portions 63 of the base 61 are upright portions bent from both ends of the base 62 in the short direction Y toward the device side (Z1 direction). The side portions 63 are erected from the edge of the base 62 along the long direction X toward the base 62, thereby improving the rigidity of the base 61. In this embodiment, the side portions 63 are erected only on the device side where the control unit 80, etc., is located. However, the side portions 63 may be erected only on the irradiation side where the light source unit 70 is located, or they may be erected on both the irradiation side and the device side. Furthermore, in this embodiment, the side portions 63 are erected at both ends of the base 62 in the short direction Y, but they may also be erected at positions other than the ends, such as the central portion of the base 62 in the short direction Y.

The fixing device 64 is positioned at both ends of the base 61 in the longitudinal direction X, and is a component that fixes the base 60 to the end covers 40 and connecting devices 87 attached to both ends of the translucent cover 30. In this embodiment, the fixing device 64 is a separate component from the base 61 and is fixed to the base 61; however, the configuration of the fixing device 64 is not limited to this configuration. For example, the base 61 and the fixing device 64 may be formed integrally by bending both ends of the base 61, so that the base 61 has a portion that functions the same as the fixing device 64.

As shown in Figure 7, the fastener 64 has a mounting portion 64a and a fixing portion 64b, and is formed by bending sheet metal. While the fastener 64 is a metal fitting, it is not limited to metal fittings; for example, it may be formed from other materials such as resin or ceramic, or by other methods such as extrusion molding or additive manufacturing.

The mounting portion 64a of the fastener 64 is formed in a planar shape along the base portion 62 of the base 61 and is the part that attaches the fastener 64 to the base 61. It is fixed to the base 61 using a fixing screw 68 (see Figure 3). The mounting portion 64a may be structurally integrated with the base 61 by methods such as crimping, welding, or fitting.

The fixing portion 64b of the fixing device 64 is the part that extends from the X1-side end of the mounting portion 64a toward the Z1 side, and the fixing portion 64b is provided with a boss 65 that protrudes toward the X1 side. The boss 65 penetrates and fits into the boss sealing portion 53 of the sealing device 50. In other words, the position of the base 60 is determined by the boss 65 fitting into the boss sealing portion 53 of the sealing device 50. The base 60 is then supported by the end cover 40 via the sealing device 50, and also supported by the translucent cover 30 via the sealing device 50.

The boss 65 is attached to the fixing part 64b by methods such as crimping, welding, or fitting. The boss 65 has a screw hole 66 into which a fixing screw 67 is screwed. A screw groove is formed on the inner circumference of the screw hole 66. As shown in Figure 8, the fixing screw 67 is inserted from the outside of the connector 87 through the fixing screw insertion hole 460 of the connector 87, the first cover through hole 411 of the first end cover 41, the boss insertion part 421b of the second end cover 42 (see Figure 6) described later, and the boss sealing part 53 of the sealing part 50. The fixing screw 67 is then screwed into the screw hole 66 of the boss 65, fixing the connector 87 to the fixing part 64 of the base 60. In other words, the connector 87 is fixed to the boss 65 of the fixing part 64 provided on the base 60. With the light fixture 3 attached to the lighting fixture 2, at least a portion of the fixing screw 67 is positioned so as to overlap with the guide portion 25 when viewed in the longitudinal direction X, which is the mounting direction of the fixing screw 67. The movement of the fixing screw 67 is restricted by the guide portion 25 to prevent it from coming loose.

As shown in Figure 7, the base 60 has a portion of its longitudinal direction X cut out at both ends. More specifically, in this embodiment, a portion of the corners at both ends of the base 61 in the longitudinal direction X is cut out. In Figure 7, the dashed lines indicate the cut-out portion, the notch 61a. The notch 61a is formed to correspond to the shape of the end cover 40 and the sealant 50. The notch 61a is provided to avoid contact between the end cover 40 and the sealant 50 attached to the base 60. By providing the notch 61a on the base 61, damage to the end cover 40 and the sealant 50 due to contact with the base 61 can be prevented, ensuring reliable waterproofing.

(Light source section 70)
As shown in Figures 8 and 9, the light source unit 70 includes a light-emitting element 71 and a substrate 72, and is configured in an elongated shape overall. The light-emitting element 71 emits light when power is supplied. In this embodiment, a light-emitting diode (LED; hereinafter referred to as LED) element is used as the light-emitting element 71, and it is mounted on the mounting surface of the substrate 72 in a row, staggered pattern, etc., along the longitudinal direction X. The light-emitting element 71 in this embodiment is a pseudo-white LED element, which is a surface-mount component packaged by arranging a phosphor that wavelength-converts blue light to yellow light on an LED chip that emits blue light with a wavelength of 440 to 480 [nm]. Here, the light emitted by the light-emitting element 71 has a maximum luminous flux value and spreads symmetrically by an irradiation angle α with respect to the optical axis L perpendicular to the light-emitting surface. In this embodiment, the irradiation angle α of the light-emitting element 71 is assumed to be 120°. The light-emitting element 71 may be a solid-state laser, semiconductor laser, organic electroluminescence (EL), inorganic electroluminescence (EL), etc. The substrate 72 may be a glass-epoxy substrate (FR-4), a glass-composite substrate (CEM-3), a paper epoxy substrate (FR-3), a paper phenolic substrate (XPC), a metal-based substrate, etc.

(Control unit 80)
The control unit 80 is a power supply device that converts power supplied from an external source into power to light up the light-emitting element 71 and supplies it to the light-emitting element 71. In this embodiment, as described above, the control unit 80 is attached to the back surface of the base portion 62 of the pedestal 61 using fixing members such as screws (not shown), and is housed together with the light-emitting element 71 in a cylindrical translucent cover 30. However, the control unit 80 may be attached to the lighting fixture 2 instead of the luminaire 3. In this case, the wire becomes a power supply line 82 (see Figures 3 and 5) that functions as a power supply path for power supplied from the control unit 80 to the light-emitting element 71. In this embodiment, one end of the luminaire wire 83, including the power supply line 84, grounding line 85, and control line 86, is connected to the control unit 80. The other end passes through the wire sealing portion 55 provided in the sealing portion 52 of the sealing device 50, is pulled out to the outside of the luminaire 3 from one end in the longitudinal direction X, and is then connected to a terminal block (not shown) attached to the lighting fixture 2.

(Details of the end cover 40)
Figure 11 is a cross-sectional view illustrating the structure around the end cover 40 of the lighting device 1 according to the embodiment. Hereinafter, the details of the end cover 40 will be described with reference to Figure 6 in addition to Figure 11. As shown in Figure 6, the end cover 40 has a first end cover 41 that constitutes the external appearance and a second end cover 42 that is positioned inside the first end cover 41. That is, the end cover 40 is constructed by integrating multiple parts. Here, the first end cover 41 and the second end cover 42 are described as being formed from a resin material. However, the material of the first end cover 41 and the second end cover 42 is not limited to a resin material. The material of the first end cover 41 and the second end cover 42 may be a metal material or ceramic material other than a resin material. Furthermore, in this embodiment, the first end cover 41 and the second end cover 42 are separate components that are fitted together to form a single integrated component.

The first end cover 41 has a first cover main surface portion 410, a first cover outer wall portion 412, a cover lower surface portion 413, a cover end surface portion 414, and a mounting guide 416. The first cover main surface portion 410 is a plate-shaped portion extending in the YZ plane and is the outer end portion in the longitudinal direction X of the luminaire 3. The first cover main surface portion 410 has an outer shape that follows the outer shape of the translucent cover 30 when viewed from the X direction, and is formed to be larger than the opening 37 (see Figure 5) of the end portion 33 of the translucent cover 30. When the translucent cover 30, the sealant 50, and the end cover 40 are assembled, the first cover main surface portion 410 is positioned outside the end portion 33 of the translucent cover 30, i.e., on the X1 side, in the first direction which is the longitudinal direction X. The first cover main surface portion 410 has a first cover through hole 411 formed therein. The boss sealing portion 53 and the boss 65 are inserted through the first cover through-hole 411 when the end cover 40, sealing device 50, and base 60 are assembled.

The first cover outer wall portion 412 is formed as a circumferential wall shape rising from the outer peripheral edge of the first cover main surface portion 410, which is the outer end, toward the X2 side. When the translucent cover 30, the sealant 50, and the end cover 40 are assembled, the first cover outer wall portion 412 is positioned outside the end portion 33 of the translucent cover 30 in a second direction intersecting the first direction, which is the longitudinal direction X. Here, the second direction is all directions (360°) intersecting the longitudinal direction X, including the short direction Y and the vertical direction Z, as described above. In other words, the first cover outer wall portion 412 is positioned to cover the annular end portion 33 of the translucent cover 30 from the outer peripheral side.

The lower cover portion 413 is a curved peripheral wall formed extending from the lower peripheral edge of the first cover main surface portion 410 toward the X1 side. The lower cover portion 413 is formed outside the first cover main surface portion 410 in the first direction (longitudinal direction X), i.e., toward the X1 side, and functions as part of a decorative cover that conceals the connector 87, connecting screw 88, and the connecting portion 27 of the lighting fixture 2. The lower cover portion 413 is continuous with the first cover outer wall portion 412 for aesthetic reasons. A through-hole 415 is formed in the lower cover portion 413.

The lower cover portion 413, together with the first cover outer wall portion 412, forms an outer wall portion 410a, which is a side wall formed on the periphery of the first cover main surface portion 410. The outer wall portion 410a rises from the outer peripheral edge of the first cover main surface portion 410, which is the outer end of the luminaire 3, and is formed as a circumferential wall shape. In the state where the translucent cover 30, the sealing device 50, and the end cover 40 are assembled, the outer wall portion 410a is positioned outside the end portion 33 of the translucent cover 30 in a second direction intersecting the first direction, which is the longitudinal direction X.

As shown in Figure 6, the cover end surface 414 is formed to cover the X1 side end of the cover bottom surface 413 and functions as part of a decorative cover that conceals the connector 87, connecting screw 88, and the connecting portion 27 of the lighting fixture 2.

As shown in Figure 11, the mounting guide 416 is a cylindrical guide wall formed extending toward Z1 from the through-hole 415 in the lower surface portion 413 of the cover. The mounting guide 416 is provided to guide a tool such as a screwdriver toward the connecting screw 88, which is pre-attached to the connector 87. The diameter of the mounting guide 416 is larger than the diameter of the head of the connecting screw 88, which is the maximum diameter of the connecting screw 88. The through-hole 415 in the lower surface portion of the cover also functions as a drainage hole. A decorative cover may be fitted to the through-hole 415 in the lower surface portion of the cover for aesthetic reasons. In this case, it is preferable that the decorative cover does not obstruct the drainage function of the through-hole 415 in the lower surface portion of the cover.

The second end cover 42 is combined with the first end cover 41 to form the end cover 40. When combined with the first end cover 41, the second end cover 42 is positioned inside the first end cover 41. As shown in Figure 6, the second end cover 42 has a second cover inner wall portion 420, a cover insertion portion 421, and a circumferential end face portion 422.

The second cover inner wall portion 420 is a side wall formed to be circumferential and extend in the X direction. When the first end cover 41 and the second end cover 42 are assembled, the second cover inner wall portion 420 faces the first cover outer wall portion 412 of the end cover 40 in a second direction intersecting the first direction, which is the longitudinal direction X.

As shown in Figure 6, the cover insertion portion 421 is a portion formed extending in the X direction on the inner upper part of the circumferential second cover inner wall portion 420, and has a wire insertion portion 421a and a boss insertion portion 421b. The wire insertion portion 421a is composed of a circumferential wall portion extending in the X direction, and the wire sealing portion 55 of the sealing device 50 is inserted while in contact with the inner circumferential surface of the wire insertion portion 421a. The boss insertion portion 421b is composed of a circumferential wall portion extending in the X direction, and the boss sealing portion 53 of the sealing device 50 is inserted while in contact with the inner circumferential surface of the boss insertion portion 421b.

The circumferential end face portion 422 is a circumferential portion formed by extending inward in a flat plate shape from the X2-side periphery of the second cover inner wall portion 420, as shown in Figure 6. The Z1-side portion of the circumferential end face portion 422 is composed of the upper part of the X2-side end of the cover insertion portion 421, as shown in Figure 9.

The inner wall portion 420 of the second cover, excluding the cover insertion portion 421 and the circumferential end surface portion 422, is an opening 423. The opening 423 is an insertion portion through which the protruding portion 54 of the sealant 50 is inserted when the end cover 40 and the sealant 50 are engaged.

(Lighting extensible structure 100)
The luminaire telescopic structure 100 will be described using Figures 8 to 11. The luminaire telescopic structure 100 comprises an end cover 40, a sealant 50, and a translucent cover 30. In other words, the components of the luminaire telescopic structure 100 are the end cover 40, the sealant 50, and the translucent cover 30. The end cover 40 has a first cover main surface portion 410, which is the outer end portion and is located outside the sealant 50 in the first direction, which is the longitudinal direction X of the luminaire 3. The end cover 40 also has a first cover outer wall portion 412, which is located outside the end portion 33 of the translucent cover 30 in the second direction, which intersects the first direction, which is the longitudinal direction X. The end cover 40 also has a second cover inner wall portion 420, which is located inside the outer wall portion 410a in the second direction, which intersects the first direction, which is the longitudinal direction X.

In the luminaire extension structure 100, when the first end cover 41 and the second end cover 42 are assembled, a circumferential and grooved insertion portion 43 is formed in the space enclosed by the outer wall portion 412 of the first cover, the inner wall portion 420 of the second cover, and the main surface portion 410 of the first cover. The insertion portion 43 extends in the longitudinal direction X. The cover sealing portion 51 of the sealing device 50 and the end portion 33 of the translucent cover 30 are inserted into this insertion portion 43. Specifically, the cover sealing portion 51 and the end portion 33 of the translucent cover 30 are inserted in close contact with the insertion portion 43, with the end portion 33 of the translucent cover 30 inserted into the grooved insertion portion 51. As a result, the sealing device 50 seals the opening 37 formed in the end face 34 of the translucent cover 30.

The insertion section 43, when the translucent cover 30, sealant 50, and end cover 40 are assembled, has an end space 58 between the end cover 40 and the connection portion 512 of the sealant 50 in the longitudinal direction X, allowing movement of the translucent cover 30 along the longitudinal direction X. The end space 58 is a circumferential space extending in the longitudinal direction X and is part of the insertion section 43. Specifically, the end space 58 is the space enclosed by the first cover outer wall portion 412, the second cover inner wall portion 420, the first cover main surface portion 410, and the connection portion 512 of the cover sealant 51. The end space 58 is a space that accommodates the movement of the end face 34 of the translucent cover 30 toward the X1 side when the translucent cover 30 extends in the longitudinal direction X. In other words, the end face 34 of the translucent cover 30 is freely movable along the longitudinal direction X within the insertion section 43, and more specifically within the end space 58.

As shown in Figure 11, the length dimension L1 in the longitudinal direction X of the end space 58 is set to be longer than the length obtained by adding the length of movement of the end face 34 within the insertion portion 43 due to the extension of the translucent cover 30 along the longitudinal direction X to the length of the connecting portion 512 of the cover sealing portion 51 in the longitudinal direction X (see Figure 12, described later). The "length of movement of the end face 34 within the insertion portion 43 due to the extension of the translucent cover 30 along the longitudinal direction X" is the length in the longitudinal direction X from the position of the end face 34 in the reference installation environment to the predicted maximum movement position of the end face 34. Furthermore, the "length dimension L1 in the longitudinal direction X of the end space 58" is the distance in the longitudinal direction X between the first cover main surface portion 410 and the connecting portion 512 of the cover sealing portion 51 when the length of the translucent cover 30 in the longitudinal direction X is at the reference length.

When the sealing portion 52 of the sealing device 50 is engaged with the end cover 40, the portion facing the circumferential end surface 422 of the end cover 40 in the longitudinal direction X is spaced L3 from the circumferential end surface 422 of the end cover 40. Because the sealing portion 52 of the sealing device 50 and the circumferential end surface 422 of the end cover 40 are spaced apart along the longitudinal direction X, a sealing device deformation space 59 is formed between the sealing portion 52 and the circumferential end surface 422 of the end cover 40. The sealing device deformation space 59 is the space facing the connection portion 56 between the inner circumference 511 of the cover sealing portion 51 and the sealing portion 52, and is a space that accommodates the elastic deformation of the sealing device 50 when the translucent cover 30 expands or contracts due to environmental changes such as temperature. The function of the sealing device deformation space 59 will be explained separately.

(Function of the luminaire telescopic structure 100)
Figures 12 and 13 are enlarged schematic diagrams illustrating the operation of the extendable lamp structure 100 of the lamp 3 according to the embodiment. Figure 12 shows the translucent cover 30 extended in the longitudinal direction X. Figure 13 shows the translucent cover 30 contracted in the longitudinal direction X. Figure 11 above shows the state in which the length of the translucent cover 30 in the longitudinal direction X is at the standard length in a standard installation environment (usage environment). The standard installation environment refers to an environment such as normal temperature, normal humidity, and normal pressure, in which case it means an environment in which temperature, humidity, and pressure are set to predetermined values. Note that one of temperature, humidity, pressure, etc. may be used as the standard for the installation environment, or two or more may be used.

The following describes the operation of the translucent cover 30 when it expands and contracts in the longitudinal direction X in response to environmental changes such as temperature, humidity, or pressure, using Figures 11 to 13. In Figures 12 and 13, the dotted arrows indicate the direction of expansion and contraction of the translucent cover 30. The sealant 50, formed from an elastic material, expands and contracts in the longitudinal direction X in accordance with the expansion and contraction of the translucent cover 30. As a result, the end portion 33 of the translucent cover 30 and the cover sealing portion 51 into which the end portion 33 is inserted move together along the longitudinal direction X inside the insertion portion 43.

Here, the length dimension L1 of the end space 58 in the longitudinal direction X is set to be longer than the length obtained by adding the length of movement of the end 33 within the insertion portion 43 due to the extension of the translucent cover 30 along the longitudinal direction X, plus the length L2 of the connecting portion 512 of the cover sealing portion 51, as described above. If the length dimension L1 of the end space 58 in the longitudinal direction X were set to be shorter than the length obtained by adding the length of movement of the end 33 within the insertion portion 43 due to the extension of the translucent cover 30 along the longitudinal direction X, plus the length L2 of the connecting portion 512 of the cover sealing portion 51, the following problems may occur. That is, when the translucent cover 30 extends toward X1, the end face 34 of the translucent cover 30 may be excessively pressed against the first cover main surface portion 410 of the first end cover 41 via the connecting portion 512 of the cover sealing portion 51, potentially causing the connecting portion 512 to break.

In contrast, in this embodiment, because the dimensional relationship is as described above, when the translucent cover 30 extends toward X1, the connecting portion 512 of the cover sealing portion 51, which moves toward X1 along with the end face 34 of the translucent cover 30, does not come into contact with the first main cover surface portion 410 of the first end cover 41. Therefore, in this embodiment, the rupture of the cover sealing portion 51 when the translucent cover 30 extends toward X1 can be suppressed. By suppressing the rupture of the cover sealing portion 51, the luminaire 3 can maintain close contact between the sealing device 50 and the translucent cover 30, thereby maintaining its waterproofness.

Furthermore, when the translucent cover 30 stretches, the connection portion 56 between the inner circumference 511 of the cover sealing portion 51 and the opening portion 52 deforms from a right-angle state as shown in Figure 11 to a curved state as shown in Figure 12. In this embodiment, a sealant deformation space 59 is formed between the opening portion 52 and the circumferential end surface 422 of the end cover 40, facing the connection portion 56. The sealant deformation space 59 is a space that allows elastic deformation of the sealant 50 due to movement along the longitudinal direction X within the insertion portion 43 of the end portion 33 of the translucent cover 30 caused by environmental changes such as temperature, humidity, or pressure. Thus, because the sealant deformation space 59 is formed facing the connection portion 56, the deformation of the connection portion 56 occurs within the sealant deformation space 59. In other words, the connection portion 56 moves and deforms within the sealant deformation space 59.

If the sealant deformation space 59 is not formed, specifically, in a configuration where the sealing portion 52 of the sealant 50 and the circumferential end surface portion 422 of the second end cover 42 are in contact when the sealant 50 and the end cover 40 are engaged, the following problems may occur. That is, when the translucent cover 30 extends towards X1, the deformation of the connecting portion 56 may cause the connecting portion 56 to be excessively pressed against the circumferential end surface portion 422 of the second end cover 42, potentially leading to the connection portion 56 breaking.

In contrast, this embodiment has a sealant deformation space 59, which allows the connecting portion 56 to elastically deform within the sealant deformation space 59. Therefore, the connecting portion 56 is not excessively pressed against the circumferential end surface 422 of the second end cover 42, thus suppressing the rupture of the connecting portion 56. In other words, because the elastic deformation of the sealant 50 occurs within the sealant deformation space 59, excessive stress is not applied to the sealant 50, suppressing its rupture. As a result, the lamp 3 can maintain close contact between the sealant 50 and the translucent cover 30 by suppressing the rupture of the sealant 50, thus maintaining its waterproof properties.

Furthermore, when the translucent cover 30 shrinks, the connecting portion 56 deforms so that the sealing portion 52 protrudes towards the X1 side, as shown in Figure 13. When the translucent cover 30 shrinks, the longitudinal distance X between the first cover main surface 410 and the connecting portion 512 of the cover sealing portion 51 expands from L1 to L3. In this embodiment, a sealing device deformation space 59 facing the connecting portion 56 is formed between the sealing portion 52 and the circumferential end surface 422 of the end cover 40. As a result, the deformation of the connecting portion 56 occurs within the sealing device deformation space 59, and the connecting portion 56 does not come into contact with other components. Therefore, excessive pressure is not applied to the connecting portion 56, and rupture of the connecting portion 56 can be suppressed.

Incidentally, in the above configuration, the circumferential end surface 422 of the second end cover 42 and the sealing portion 52 of the sealant 50 are spaced apart. Therefore, the above configuration has the following advantages compared to the configuration in which the position of the circumferential end surface 422 of the second end cover 42 in the longitudinal direction X moves toward the X2 side and contacts the sealing portion 52 of the sealant 50 (hereinafter referred to as the comparative example configuration). Specifically, the above configuration can reduce the contact area between the end cover 40 and the sealant 50 compared to the comparative example configuration. Therefore, the lamp 3 in the above configuration can reduce the force hindering the expansion and contraction of the translucent cover 30, and can avoid applying excessive stress to the translucent cover 30.

Furthermore, because the above configuration provides the sealing device deformation space 59 on the inside (X2 side) of the end cover 40, the longitudinal dimension X of the luminaire 3 can be shortened compared to a configuration where, for example, the position of the end cover 40 is moved to the X1 side to secure the sealing device deformation space 59. In other words, the above configuration allows for miniaturization of the luminaire 3, resulting in benefits such as greater flexibility in installation, reduced weight, simplified packaging, and improved transportation efficiency.

Here, the end portion 33 of the translucent cover 30 is held within the cover sealing portion 51 and is in close contact with it. Even when the translucent cover 30 expands or contracts, the positional relationship between the end portion 33 and the cover sealing portion 51 remains largely unchanged. Specifically, the sealing device 50 is designed to hold the end portion 33 of the translucent cover 30 with a holding force that maintains close contact with the end portion 33 of the translucent cover 30 while undergoing elastic deformation in the sealing device deformation space 59. Therefore, as the end portion 33 moves within the insertion portion 43 due to the expansion or contraction of the translucent cover 30, the positional relationship between the end portion 33 and the cover sealing portion 51 does not change, and the close contact is maintained. With this configuration, the luminaire 3 can maintain close contact between the sealing device 50 and the translucent cover 30 regardless of the operating environment of the luminaire 3.

<Effects and Effects>
As described above, the luminaire telescopic structure 100 of this embodiment comprises a long base 60 and a translucent cover 30 which is a cylindrical outer shell that covers the base 60 and has an opening 37 formed on the longitudinal end face 34 of the base 60. The luminaire 3 further comprises an insertion part 43 into which the end 33 of the translucent cover 30 is inserted, an end cover 40 which is a lid attached to the end 33 of the translucent cover 30 so as to cover the opening when the end 33 of the translucent cover 30 is inserted into the insertion part 43, and a sealing device 50 which is positioned between the translucent cover 30 and the end cover 40 in the longitudinal direction and seals the opening 37 of the end 33 of the translucent cover 30. The sealing device 50 includes a cover sealing portion 51 that clamps the end 33 of the translucent cover 30 in the circumferential direction in a second direction perpendicular to the first direction which is the longitudinal direction, and is positioned in the insertion portion 43 in that state, and a sealing portion 52 that is formed integrally with the cover sealing portion 51 and seals the inside of the opening 37 in the second direction from the cover sealing portion 51. In the first direction, a sealing device deformation space 59 is provided between the end cover 40 and the sealing portion 52 to allow elastic deformation of the sealing device 50 due to the movement of the end 33 within the insertion portion 43 caused by environmental changes such as temperature, humidity, or pressure.

With the above configuration, when the end 33 of the translucent cover 30 moves within the insertion portion 43 due to environmental changes such as temperature, humidity, or pressure, the elastic deformation of the sealant 50 that occurs with the movement of the end 33 takes place within the sealant deformation space 59. Therefore, excessive stress is not applied to the sealant 50, and damage to the sealant 50 can be suppressed. Furthermore, to suppress damage to the sealant 50 due to such environmental changes, it is only necessary to provide a sealant deformation space 59 between the end cover 40 and the sealing portion 52, thus enabling the suppression of damage to components due to environmental changes with a simple structure. As a result, the lamp extension structure 100 can maintain its waterproofness even in environments where temperature, humidity, or pressure changes.

In the sealing device 50, the connection portion 56 between the cover sealing portion 51 and the opening portion 52 faces the sealing device deformation space 59, and the elastic deformation of the connection portion 56 is permitted within the sealing device deformation space 59.

The above configuration makes it possible to suppress damage to the connection portion 56 between the cover sealing portion 51 and the opening sealing portion 52 of the sealing device 50.

Furthermore, the cover sealing portion 51 of the sealing device 50 has an outer peripheral portion 510 that contacts the outer surface of the end portion 33 of the translucent cover 30, an inner peripheral portion 511 that contacts the inner surface of the end portion 33 of the translucent cover 30, and a connecting portion 512 that contacts the end face 34 in the first direction of the translucent cover 30 and connects the outer peripheral portion 510 and the inner peripheral portion 511. The connecting portion 56 between the inner peripheral portion 511 and the sealing portion 52 faces the sealing device deformation space 59, and the elastic deformation of the connecting portion 56 is permitted in the sealing device deformation space 59.

With the above configuration, damage to the connection portion 56 between the inner circumference 511 and the sealing portion 52 of the cover sealing portion 51 of the sealing device 50 can be suppressed.

Furthermore, the insertion portion 43 has an end space 58 between the end cover 40 and the connecting portion 512 of the sealant 50 in the first direction, which allows movement of the cover sealing portion 51 in the first direction.

With the above configuration, when the end portion 33 of the translucent cover 30 moves within the insertion portion 43 due to environmental changes such as temperature, humidity, or pressure, the elastic deformation of the sealant 50 that occurs with the movement of the end portion 33 takes place within the end portion space 58. Therefore, excessive stress is not applied to the sealant 50, and damage to the sealant 50 can be suppressed. Specifically, damage to the connection portion 512 of the sealant 50 can be suppressed.

Furthermore, the end cover 40 and sealing device 50 of the luminaire 3 in this embodiment may be attached to either end 3A or 3B in the longitudinal direction X of the luminaire 3. Also, while the lighting device 1 in this embodiment and its modifications is described using a so-called trough-type lighting fixture 2 as an example, the lighting device 1 is not limited to this. The lighting device 1 can employ other shapes as the lighting fixture 2 to which the luminaire 3 is mounted, such as a so-called shaded type, a single-sided reflector shaded type, a V-shaped type, etc. Moreover, while the lighting fixture 2 and luminaire 3 constituting the lighting device 1 are both shown as elongated in this embodiment, the lighting device is not limited to this. The luminaire 3 or the lighting fixture 2 to which the luminaire 3 is mounted may be short. For example, the luminaire 3 may have a shape where the length dimension in the axial direction of the translucent cover 30 is smaller than the length dimension in the radial direction.

Furthermore, the lighting fixture 3 is not limited to the structure shown in the figures above, and can be modified and implemented, for example, as follows, without departing from the gist of this disclosure.

(Variation 1)
Figure 14 is a perspective view of the end 3A of the lighting device 1 equipped with the sealing device 50a of the modified example 1 according to the embodiment. Figure 15 is a perspective view of the sealing device 50a of the modified example 1 according to the embodiment. Figure 15(a) is a perspective view of the sealing device 50a seen from the light-transmitting cover 30 side, and Figure 15(b) is a perspective view of the sealing device 50a seen from the end cover 40 side.

The sealing device 50a in Modification 1 includes a projection 542 that protrudes toward Z1 from the lower surface of the protruding peripheral portion 541 of the protruding portion 54. The upper surface 542a of the projection 542 does not contact the mounting surface of the substrate 72 of the light source unit 70 when the sealing device 50a and the end cover 40 are engaged, but is spaced apart. Two projections 542 are formed, but the number is arbitrary.

The sealing device 50a in the above configuration has a projection 542. Therefore, compared to a configuration without the projection 542, the distance the light source unit 70 falls when the adhesive 73 deteriorates and the light source unit 70 detaches from the base 60 can be shortened. Thus, the impact on the light source unit 70 when it falls and contacts the projection 542 can be reduced, and damage to the light source unit 70 can be suppressed. Furthermore, the impact sound when the light source unit 70 falls and contacts the projection 542 can be suppressed.

(Variation 2)
Figure 16 is a perspective view of the sealing device 50b of modified example 2 according to the embodiment. Figure 16(a) is a perspective view of the sealing device 50b as seen from the translucent cover 30 side, and Figure 16(b) is a perspective view of the sealing device 50b as seen from the end cover 40 side.

The sealing device 50b in the modified example 2 does not have a wire sealing portion 55.

Even with the above configuration of the sealing device 50b, it is possible to prevent the light source unit 70 from coming into contact with the light-transmitting cover 30 when the light source unit 70 detaches from the base 60.

(Variation 3)
Figure 18 is a cross-sectional view of the sealing device 50c of Modification 3 according to the embodiment. Figure 18 shows a cross-section of the sealing device 50c of Modification 3 along the longitudinal direction X.

As shown in Figure 18, the sealing device 50c of Modified Example 3 has protrusions 513 on the inner surface 515 of the outer peripheral portion 510c and on the outer surface 518 of the inner peripheral portion 511c, but does not have protrusions 513 on the outer surface 516 of the outer peripheral portion 510c or on the inner surface 517 of the inner peripheral portion 511c.

The shape of the sealant 50c in the above configuration is an example of a shape that improves the adhesion between the translucent cover 30 and the end cover 40 and the cover sealing portion 51c, the ease of assembly of the lamp 3, and the moldability of the sealant 50c. Because the cross-sectional shape of the sealant 50c in the above configuration is simplified, it is easy to adopt highly versatile direct pressure molding, and it also has excellent release properties.

The relative sizes of T1, T2, T3, and T4 in Figure 18 are the same as in Figure 11.

(Variation 4)
Figure 19 is a cross-sectional view of the sealing device 50d of modified example 4 according to the embodiment. Figure 19 shows a cross-section of the sealing device 50d of modified example 4 along the longitudinal direction X.

As shown in Figure 19, the sealing device 50d of Modified Example 4 has recesses 514 on its outer circumference 510d and inner circumference 511d.

The outer peripheral portion 510d has a protrusion 513 formed on the inner surface 515 of the outer peripheral portion that contacts the outer surface 35 of the translucent cover 30, so as to project toward the outer surface 35. Furthermore, the outer peripheral portion 510d has a recess 514 formed on the outer surface 516 of the outer peripheral portion that contacts the first end cover 41, so as to recede toward the outer surface 35.

The inner circumference 511d has a protrusion 513 formed on the outer surface 518 of the inner circumference that contacts the inner surface 36 of the translucent cover 30, so as to project toward the inner surface 36. Furthermore, the inner circumference 511d has a recess 514 formed on the inner surface 517 of the inner circumference that contacts the second end cover 42, so as to recede toward the inner surface 36.

The recess 514 and protrusion 513 are formed in an annular shape on the outer circumference 510d and inner circumference 511d. Furthermore, the recess 514 is formed at a position corresponding to the protrusion 513, and the deepest part of the recess 514 (center of the recess) approximately coincides with the tip of the protrusion 513 (center of the protrusion). Because the protrusion 513 and recess 514 are formed on the outer circumference 510d and inner circumference 511d of the cover sealing portion 51d, the cross-section when cut in the XZ plane has a roughly wavy shape.

The height dimension T2 of the protrusion 513 and the depth dimension T5 of the recess 514 are determined considering the adhesion between the translucent cover 30 and the end cover 40 and the cover sealing portion 51d, the ease of assembly of the lamp 3, and the moldability (release properties) of the sealing device 50d. The height dimension T2 of the protrusion 513 in the undeformed state is less than or equal to the thickness dimension T1 of the outer peripheral portion 510d and inner peripheral portion 511d in the undeformed state (T2 ≤ T1), and the height dimension T2 of the protrusion 513 in the undeformed state is less than or equal to the distance dimension T3 between the outer peripheral portion 510d and inner peripheral portion 511d in the undeformed state (T2 ≤ T3).

The depth T5 of the recess 514 in the undeformed state is less than or equal to the thickness T1 of the outer periphery 510d and inner periphery 511d in the undeformed state (T5 ≤ T1), and the depth T5 of the recess 514 in the undeformed state is less than or equal to the height T2 of the convex portion 513 in the undeformed state (T5 ≤ T2). Furthermore, the distance T3 between the outer periphery 510d and inner periphery 511d in the undeformed state is less than or equal to the thickness T4 of the end portion 33 of the translucent cover 30 (T3 ≤ T4).

The sealant 50d is another example of a shape that improves the adhesion between the translucent cover 30 and the end cover 40 and the cover sealant 51d, the assembly of the lamp 3, and the moldability (release properties) of the sealant 50d. The amount of deformation (amount of crushing due to compression) of the cover sealant 51d is selected to be, for example, 30% or less of the thickness dimension in the undeformed state, so that elasticity is maintained over a long period of time.

(Variation 5)
Figure 20 is a cross-sectional view of the sealing device 50e of modified example 5 according to the embodiment. Figure 20 shows a cross-section of the sealing device 50e of modified example 5 along the longitudinal direction X.

As shown in Figure 20, the sealant 50e of Modified Example 5 differs in the shape of the convex portion 513 and concave portion 514 from those of Modified Example 4. The sealant 50e of Modified Example 5 has convex portion 513e and concave portion 514e with different shapes from those of Modified Example 4, on the outer circumference 510e and inner circumference 511e. The shapes of the convex portion 513e and concave portion 514e can be changed considering the adhesion between the translucent cover 30 and end cover 40 and the cover sealant portion 51e, the ease of assembly of the lamp 3, and the moldability (release properties) of the sealant 50c.

Each of the convex portion 513e and the concave portion 514e has two inclined portions with different inclination angles when viewed in the cross-section of Figure 20. Specifically, in its undeformed state, the convex portion 513e has two inclined portions 513e1 and 513e2 with the tip of the convex portion 513e in between. Inclined portion 513e1 is the inclined portion closer to the connection portion 512 in the longitudinal direction X, and inclined portion 513e2 is the inclined portion further from the connection portion 512 in the longitudinal direction X. Similarly, in its undeformed state, the concave portion 514e has two inclined portions 514e1 and 514e2 with the most recessed portion of the concave portion 514e in between. Inclined portion 514e1 is the inclined portion closer to the connection portion 512 in the longitudinal direction X, and inclined portion 514e2 is the inclined portion further from the connection portion 512 in the longitudinal direction X. Furthermore, when the inclination angles of the inclined portions 514e1, 513e1, and 513e2 with respect to the longitudinal direction X are denoted as θ1, θ2, and θ3 respectively, the relationship θ1 < θ3 and θ2 < θ3 exists. This relationship between the inclination angles makes it easier to release the mold from the cover sealing portion 51e.

The sealing device 50e with the above configuration is an example of a shape that further improves moldability (release properties).

(Variation 6)
Figure 21 is a cross-sectional view of the sealing device 50f of modified example 6 according to the embodiment. Figure 21 shows a cross-section of the sealing device 50f of modified example 6 along the longitudinal direction X.

As shown in Figure 21, the sealing device 50f of Modified Example 6 has a larger thickness dimension T1 between the outer peripheral portion 510f and the inner peripheral portion 511f in their undeformed state. Specifically, the sealing device 50f of Modified Example 6 has a thickness dimension T1 between the outer peripheral portion 510f and the inner peripheral portion 511f in their undeformed state that is greater than or equal to the distance dimension T3 between the outer peripheral portion 510f and the inner peripheral portion 511f in their undeformed state (T3 ≤ T1). The relative sizes of T1, T2, T3, T4, and T5 are the same as in Figure 19. Furthermore, the sealing device 50f does not have protrusions on the inner surface 515 of the outer peripheral portion 510f or the outer surface 518 of the inner peripheral portion 511f. The sealing device 50f has recesses 514f on the outer surface 516 of the outer peripheral portion 510f and the inner surface 517 of the inner peripheral portion 511f.

With the above configuration, when the sealing device 50f is attached to the end 33 of the translucent cover 30, the entire inner surface 515 of the outer circumference and the outer surface 35 of the translucent cover 30 are in close contact, and the entire outer surface 518 of the inner circumference and the inner surface 36 of the translucent cover 30 are in close contact.

The sealing device 50f is yet another example of a shape that improves the adhesion between the translucent cover 30 and the end cover 40 and the cover sealing portion 51d, the assembly of the lamp 3, and the moldability (release properties) of the sealing device 50f. It is also possible to further reduce the amount of deformation (amount of crushing due to compression) of the cover sealing portion 51f.

The above describes embodiments and variations of the structure of each part, but the luminaire extension structure, luminaire, and lighting device are not limited to the configurations of the embodiments described above. The configuration of the lighting device described above is just one example and may include other components. The luminaire extension structure, luminaire, and lighting device include design modifications and variations in application that are ordinarily performed by those skilled in the art, without departing from the technical concept.

The various aspects of this disclosure are summarized below as an appendix.

(Note 1)
A long base and
A cylindrical outer shell that covers the base and has an opening formed on the longitudinal end face of the base,
A lid is attached to the end of the outer shell so as to cover the opening when the end of the outer shell is inserted into the insertion portion, and the end of the outer shell is inserted into the insertion portion.
The system comprises a sealing device positioned between the outer shell and the lid in the longitudinal direction, which seals the opening at the end of the outer shell,
The aforementioned sealing device is
An outer shell sealing portion is positioned in the insertion portion in such a state, and the end of the outer shell is clamped in the circumferential direction in a second direction perpendicular to the first direction which is the longitudinal direction,
It comprises a sealing portion formed integrally with the outer sealing portion, which seals the inside of the opening from the outer sealing portion in the second direction,
In the first direction, a sealing device deformation space is provided between the lid and the sealing portion to allow elastic deformation of the sealing device due to the movement of the end portion within the insertion portion caused by environmental changes.

(Note 2)
The lamp extension and retraction structure according to Appendix 1, wherein the sealing device has a connection portion between the outer sealing portion and the sealing portion that faces the sealing device deformation space, and elastic deformation of the connection portion is permitted in the sealing device deformation space.

(Note 3)
The outer sealing portion of the sealing device is
The outer peripheral portion that contacts the outer surface of the end of the outer shell,
The inner circumferential portion that contacts the inner surface of the end of the outer shell,
It has a connecting portion that contacts the end face in the first direction of the outer shell and connects the outer periphery and the inner periphery,
The lamp extension and retraction structure according to Appendix 1 or Appendix 2, wherein the connection portion between the inner circumference and the sealing portion faces the sealing device deformation space, and the elastic deformation of the connection portion is permitted in the sealing device deformation space.

(Note 4)
The lamp extension structure according to Appendix 3, wherein the insertion portion has an end space between the lid and the connecting portion of the sealant in the first direction that allows the outer sealing portion to move along the first direction.

(Note 5)
A luminaire comprising a luminaire telescopic structure described in any one of the appendices 1 to 4, and a light source unit positioned on the base.

(Note 6)
The lighting fixtures described in Appendix 5,
A lighting device comprising a lighting fixture that is installed on a mounting part and to which the light fixture is detachably attached.

1 Lighting device, 2 Lighting fixture, 3 Lamp, 3A End, 3B End, 9 Construction part, 20 Fixture body, 21 Fixture bottom, 22 Fixture side, 23 Opening side end, 24 Fixture end, 25 Guide part, 26 Knockout, 27 Connecting part, 28 Screw hole, 29 Mounting part, 30 Light-transmitting cover, 30a Main surface, 30b Back surface, 30c Cover side, 31 Exposed part, 33 End, 34 End face, 35 Outer surface, 36 Inner surface, 37 Opening, 40 End cover, 41 First end cover, 42 Second end cover, 43 Insertion part, 50 Sealing device, 50a Sealing device, 50b Sealing device, 50c Sealing device, 50d Sealing device, 50e Sealing device, 50f Sealing device, 51 Cover sealing part, 51c Cover sealing part, 51d Cover sealing part, 51e Cover sealing part, 51f Cover sealing part, 52 Sealing part, 53 Boss sealing part, 54 Protruding part, 55 Wire sealing part, 56 Connection part, 58 End space, 59 Sealing device deformation space, 60 Base, 61 Base, 61a Notch, 62 Base, 63 Side part, 64 Fixing device, 64a Mounting part, 64b Fixing part, 65 Boss, 66 Screw hole, 67 Fixing screw, 68 Fixing screw, 70 Light source part, 71 Light-emitting element, 72 Substrate, 73 Adhesive, 80 Control unit, 81 Fixing screw, 82 Power supply line, 83 Lighting device wire, 84 Power supply line, 85 Grounding wire, 86 Control line, 87 Connector, 88 Connecting screw, 100 Lighting device telescopic structure, 410 410a Main surface of the first cover, 411 Outer wall portion, 411 First cover through hole, 412 First cover outer wall portion, 413 Bottom surface portion of the cover, 414 End surface portion of the cover, 415 Through hole in the bottom surface portion of the cover, 416 Mounting guide, 420 Inner wall portion of the second cover, 421 Cover insertion portion, 421a Wire insertion portion, 421b Boss insertion portion, 422 Circumferential end surface portion, 423 Opening, 460 Fixing screw insertion hole, 510 Outer circumference portion, 510c Outer circumference portion, 510d Outer circumference portion, 510e Outer circumference portion, 510f Outer circumference portion, 511 Inner circumference portion, 511c Inner circumference portion, 511d Inner circumference portion, 511e Inner circumference portion, 511f Inner circumference portion, 512 Connection portion, 513 Protrusion, 513e Protrusion, 513e1 Inclined portion, 513e2 Inclined portion, 514 Recess, 514e Recess, 514e1 Inclined portion, 514e2 Inclined portion, 515 Inner surface of outer periphery, 516 Outer surface of outer periphery, 517 Inner surface of inner periphery, 518 Outer surface of inner periphery, 540 Protruding end, 541 Protruding periphery, 542 Projection, 542a Upper surface, 551 Wire insertion hole, 871 Through hole.

Claims (5)

A long base and
A cylindrical outer shell that covers the base and has an opening formed on the longitudinal end face of the base,
A lid is attached to the end of the outer shell so as to cover the opening when the end of the outer shell is inserted into the insertion portion, and the end of the outer shell is inserted into the insertion portion.
The system comprises a sealing device positioned between the outer shell and the lid in the longitudinal direction, which seals the opening at the end of the outer shell,
The aforementioned sealing device is
An outer shell sealing portion is positioned in the insertion portion in such a state, and the end of the outer shell is clamped in the circumferential direction in a second direction perpendicular to the first direction which is the longitudinal direction,
It comprises a sealing portion formed integrally with the outer sealing portion, which seals the inside of the opening from the outer sealing portion in the second direction,
In the first direction, a sealant deformation space is provided between the lid and the sealing portion to allow elastic deformation of the sealant due to movement of the end portion within the insertion portion caused by environmental changes .
The outer sealing portion of the sealing device is
The outer peripheral portion that contacts the outer surface of the end of the outer shell,
The inner circumferential portion that contacts the inner surface of the end of the outer shell,
It has a connecting portion that contacts the end face in the first direction of the outer shell and connects the outer periphery and the inner periphery,
The insertion portion is a lamp extendable structure having an end space between the lid and the connecting portion of the sealant in the first direction that allows movement of the outer sealing portion along the first direction . The lamp extension and retraction structure according to claim 1, wherein the sealing device has a connection portion between the outer sealing portion and the sealing portion that faces the sealing device deformation space, and elastic deformation of the connection portion is permitted in the sealing device deformation space. The lamp extension and retraction structure according to claim 1 or claim 2, wherein the connection portion between the inner circumference and the sealing portion faces the sealing device deformation space, and the elastic deformation of the connection portion is permitted in the sealing device deformation space. A luminaire comprising the luminaire telescopic structure described in claim 1 or claim 2, and a light source unit disposed on the base. The luminaire described in claim 4 ,
A lighting device comprising a lighting fixture that is installed on a mounting part and to which the light fixture is detachably attached.