Lighting device

Abstract

To provide a lighting device capable of being downsized even in a utility tunnel, of efficiently radiating heat, and of being stably used for a long time.SOLUTION: In a lighting device which houses a light-emitting part in a translucent cylindrical part with light transmissivity and has a housing formed by closing both end sides of the translucent cylindrical part with a closing part, a closing part has a cylindrical end connection part externally fitted to an opening end of the translucent cylindrical part, a radiation partition part dividing the housing inner part into a light-emitting region housing the light-emitting part and an adjacent region in an extension direction of the housing, and having thermal conductivity in the terminal connection part. The heat radiation partition part has a plate-like partition part body dividing the housing inner part and a cylindrical heat radiation part connected to an outer peripheral part of the partition part body and extending in the extension direction. The cylindrical heat radiation part contacts the end connection part or an inner peripheral surface of the translucent cylindrical part on an outer peripheral surface extending in the extension direction.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present invention relates to a lighting device, and more particularly to a lighting device using LEDs (Light Emitting Diodes).

Background Art

[0002] In recent years, in lighting fixtures installed in poor temperature environments such as in urban areas and tunnels underground in urban areas, in order to achieve energy savings and long life, LEDs (Light Emitting Diodes) for lighting fixtures have been considered.

[0003] As a lighting fixture using LEDs, a lighting device configured by housing a light source using LEDs in a cylindrical body is known (see, for example, Patent Document 1).

[0004] In addition, with the light source being LED-based, measures against heat generation of the LED, which is an electronic component, and its power supply module have become important.

[0005] In the LED lighting lamp of Patent Document 1, a heat dissipation plate processed by pressing is adhered to the inner surface of the lamp shade so that the generated heat is released to the outside through the lamp shade.

[0006] Thus, in conventional lighting fixtures using LEDs, it is common to dissipate heat generated by the light source from the entire case through the lamp shade or the side end surface surrounding the light source.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] Incidentally, in recent years, there has been a demand for miniaturization of lighting fixtures installed inside tunnels. In conventional lighting fixtures that use LEDs to achieve miniaturization, a structure that can withstand the high heat generated by both the LEDs and the power supply is necessary to prevent a decrease in the luminous efficiency of the LEDs due to high temperatures.

[0009] The objective of this invention is to provide a lighting device that can be miniaturized even inside tunnels, efficiently dissipates heat, and can be used stably for a long period of time. [Means for solving the problem]

[0010] The present invention's lighting device, In a lighting device having a housing formed by housing a light-emitting part within a light-transmitting cylindrical part and closing both ends of the light-transmitting cylindrical part with closing parts, The closing portion has a cylindrical end connecting portion that fits onto the open end of the light-transmitting tube portion. cylindrical Within the end connection portion, a heat dissipation partition portion is provided that divides the inside of the housing into a light-emitting region housing the light-emitting portion and an adjacent region in the extending direction of the housing, and which has thermal conductivity. The heat dissipation partition section is, The enclosure comprises a plate-shaped partition body that divides the inside of the enclosure, Within the aforementioned end connection portion, It has a cylindrical heat dissipation section connected to the outer periphery of the partition body and extending in the direction of extension, The cylindrical heat dissipation portion is configured such that its outer peripheral surface, which extends in the direction of extension, abuts against the end connection portion or the inner peripheral surface of the light-transmitting cylindrical portion. [Effects of the Invention]

[0011] According to the present invention, miniaturization can be achieved even inside tunnels, and heat can be dissipated efficiently, allowing for stable and long-term use. [Brief explanation of the drawing]

[0012] [Figure 1] This is a right side view of a lighting device according to an embodiment of the present invention. [Figure 2]It is a plan view of a lighting device according to an embodiment of the present invention. [Figure 3] It is a rear view showing the base end portion of the lighting device according to an embodiment of the present invention. [Figure 4] It is a front view showing the tip end portion of the lighting device according to an embodiment of the present invention. [Figure 5] It is a cross-sectional view taken along the line B-B in FIG. 3. [Figure 6] It is a view showing a state in which the cap portion is removed on the base end side of the lighting device according to an embodiment of the present invention. [Figure 7] It is a cross-sectional view taken along the line A-A in FIG. 1. [Figure 8] It is a perspective view showing the light source unit of the lighting device according to an embodiment of the present invention. [Figure 9] It is an enlarged cross-sectional view showing the portion X in FIG. 5. [Figure 10] It is a longitudinal cross-sectional view for explaining the main part configuration of Modification 1 of the lighting device according to an embodiment of the present invention. [Figure 11] It is a cross-sectional view corresponding to the cross-sectional view taken along the line C-C in FIG. 10. [Figure 12] It is an enlarged cross-sectional view showing the portion X1 in FIG. 10. [Figure 13] It is a longitudinal cross-sectional view for explaining the main part configuration of Modification 2 of the lighting device according to an embodiment of the present invention. [Figure 14] It is a cross-sectional view corresponding to the cross-sectional view taken along the line D-D in FIG. 13. [Figure 15] It is an enlarged cross-sectional view showing the portion X2 in FIG. 13. [Figure 16] It is a longitudinal cross-sectional view for explaining the main part configuration of Modification 3 of the lighting device according to an embodiment of the present invention. [Figure 17] It is a cross-sectional view corresponding to the cross-sectional view taken along the line E-E in FIG. 16. [Figure 18] It is an enlarged cross-sectional view showing the portion X3 in FIG. 16. [Figure 19] It is a view for explaining the heat dissipation partition portion in Modification 4 of the lighting device according to an embodiment of the present invention. [Figure 20] It is a cross-sectional view taken along the line F-F in FIG. 19. [Figure 21] This figure illustrates the heat dissipation partition in a modified example 5 of the lighting device according to an embodiment of the present invention. [Figure 22] Figure 21 shows the mounting structure of the heat dissipation partition as seen from the outer opening side with the cap removed. [Modes for carrying out the invention]

[0013] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0014] In the lighting device according to this embodiment, the direction in which the cable for emitting light from the light source inside the housing is led out from the housing is described as the base end. The direction indicating this base end, and the expressions indicating other directions such as the front (tip), left, and right, are relative, not absolute, and are used to describe the configuration and operation of each part of the lighting device 1. That is, they are appropriate when each part of the lighting device 1 is in the position shown in the figure, but if that position changes, they should be interpreted in accordance with the change in position.

[0015] The lighting device 1 shown in Figures 1 to 4 emits light using power supplied from an external source via a cable 12. The lighting device 1 is used, for example, by connecting the molded receptacle 13 at the end of the cable 12 to a branch section in a tunnel where a main cable (not shown), laid along the direction of the tunnel's extension, is branched at predetermined intervals. The cable 12 is connected to the branch section in a watertight manner via the molded receptacle 13.

[0016] The lighting device 1 has a light-emitting chamber (light-emitting area) 1a that houses a light source 35 and a power module 3 that drives the light source 35, and is transparent, and closed chambers (adjacent spatial areas) 1b and 1c that are provided adjacent to the light-emitting chamber 1a and have a room temperature different from the temperature inside the light-emitting chamber 1a. The closed chambers 1b and 1c are adjacent to the light-emitting chamber 1a in the axial direction of the light-transmitting cylinder 6, that is, in the axial direction of the light-emitting chamber 1a.

[0017] In the lighting device 1 of this embodiment, the inside of the hollow housing 2 is divided into multiple spatial regions: a light-emitting chamber 1a (see Figure 5) and enclosed chambers 1b and 1c (see Figure 5). The lighting device 1 prevents the light-emitting chamber 1a (see Figure 5) from becoming too hot by using enclosed chambers 1b and 1c (see Figure 5), which have a temperature difference from the light-emitting chamber 1a. In this embodiment, the room temperature of enclosed chambers 1b and 1c is lower than the room temperature of the light-emitting chamber 1a. Furthermore, the lighting device 1 is waterproof and, for example, satisfies the protection class for electrical machinery and equipment enclosures (JIS C0920 IPX7). Note that additional enclosed chambers may be provided adjacent to enclosed chambers 1b and 1c. It is also possible to have a configuration in which two or more enclosed chambers are provided on either side of the light-emitting chamber 1a in the axial direction of the light-transmitting cylinder 6. In that case, the room temperature of the enclosed chambers decreases as you move away from the light-emitting chamber 1a.

[0018] The specific configuration of lighting device 1 will be described below. Figure 5 is a cross-sectional view taken along the line BB in Figure 3, Figure 6 shows the base end of the lighting device according to an embodiment of the present invention with the cap removed, and Figure 7 is a cross-sectional view taken along the line AA in Figure 1. Figure 8 is a perspective view showing the light source unit of the lighting device according to an embodiment of the present invention.

[0019] The housing 2 of the lighting device 1 houses the light source 35 and the power module 3 and has a translucent cylindrical light-transmitting section 6 and closing sections 7 and 8 that close both ends of the light-transmitting section 6. In this embodiment, the closing sections 7 and 8 have open end connection sections 72 and 82 and cap sections 74 and 84. By attaching the cap sections 74 and 84 to the light-transmitting section 6 via the open end connection sections 72 and 82, the light-transmitting section 6, and by extension the housing 2 itself, is configured to be completely sealed.

[0020] <Power Module 3> The power module 3 is connected to the cable 12 and the light source 35, and when power is supplied via the cable 12, it drives the light source 35 to emit light.

[0021] The power supply module 3 can be configured in any way as long as it causes the light source to emit light. In this embodiment, it is a DC power supply device that supplies DC power to the LED to cause it to emit light.

[0022] The power module 3 is fixed to the power supply mounting section 42 of the chassis 4 so that the heat generated during operation is conducted to the power supply mounting section 42. For example, it is fixed with fasteners such as screws (not shown). The power module 3 is located on the upper side of the chassis 4.

[0023] <Light source 35> The light source 35 constitutes a light-emitting unit housed within the translucent tube 6. The light source may also constitute a light-emitting unit together with the power supply module 3. In this embodiment, the light source 35 is an LED, which is a light-emitting element that consumes less power compared to, for example, an incandescent light bulb or a fluorescent lamp with a glow starter or rapid starter. The light source 35 has multiple LEDs and is fixed to the light source mounting section 43 which forms the lower side of the chassis 4.

[0024] <Chassis 4> The chassis 4 supports the light-emitting section within the translucent tube section 6. The chassis 4 is a long, longitudinal structure, and in this embodiment, it is formed to extend axially within the translucent tube section 6 by a heat-conducting member. In this embodiment, the chassis 4 is made of a heat-conducting metal material such as aluminum.

[0025] The chassis 4 has a plate-shaped power supply mounting section 42 to which the power supply module 3 is attached, and a light source mounting section 43 to which the light source 35 is attached.

[0026] The power supply mounting section 42 and the light source mounting section 43 are each formed by processing a long plate material that has thermal conductivity, and are spaced apart vertically, facing each other parallel to each other, and extending in the longitudinal direction. The connection between the power supply mounting section 42 and the light source mounting section 43 is, for example, as shown in Figures 7 and 8, such that the power supply mounting section 42 is suspended from the plate-shaped power supply mounting section 42 via legs (spacers) 44 protruding from its lower surface. Preferably, the legs 44 are made of a thermally conductive material, similar to the power supply mounting section 42 and the light source mounting section 43, thereby allowing heat generated from the light source 35 to be transferred to the power supply mounting section 42. The legs 44 are formed of a thermally conductive metal material such as aluminum.

[0027] In this configuration, the multiple light sources 35 mounted on the chassis 4 and the power supply module 3 are spaced apart vertically via the legs 44.

[0028] The power supply mounting section 42 has the power supply module 3 fixed to its upper (surface) side. The power supply mounting section 42 is positioned along the translucent cylindrical section 6 and is fixed to the heat dissipation partition sections 5 and 50 at both ends via joint sections 46. In other words, the heat dissipation partition sections 5 and 50 are joined to both ends of the chassis 4.

[0029] The joint portion 46 is made of a thermally conductive metal material, such as aluminum. The joint portion 46 has a fixed surface portion 462 that is stacked on each end of the power supply mounting portion 42 and fixed in surface contact, and a joint surface portion 464 that is bent perpendicularly from the fixed surface portion 462. The joint surface portion 464 is fixed in full contact with the heat dissipation partition portions 5 and 50, thereby firmly and integrally fixing the power supply mounting portion 42 in surface contact with the heat dissipation partition portions 5 and 50. The power supply mounting portion 42, the joint portion 46, and the heat dissipation partition portions 5 and 50 are fixed together by thermally conductive joining means or joining members, such as welding or fastening with screws.

[0030] The light source mounting section 43 has a pair of mounting members, each having a mounting plate portion 432 and an inclined plate portion 434 that bends downward from one side along the longitudinal direction of the mounting plate portion 432. The light source mounting section 43 may be, for example, a long substrate having a substantially L-shaped cross-section with the mounting plate portion 432 and the inclined plate portion 434.

[0031] In the light source mounting section 43, a pair of mounting members are provided below the power supply mounting section 42, symmetrically arranged when viewed from the axial direction. Specifically, a pair of mounting plate sections 432, 432 are spaced apart from each other and arranged in a planar manner opposite the power supply mounting section 42. From the respective opposite edges of these mounting plate sections 432, 432, inclined plate sections 434 are positioned so as to descend in opposite directions.

[0032] Multiple light sources 35 are arranged on the back surface (lower surface) of the inclined plate section 434 in a straight line along the longitudinal direction at predetermined intervals.

[0033] The light source 35 emits light vertically from the back surface of the installed inclined plate portion 434. Therefore, the light source 35 emits light on each of the pair of mounting members in a radial direction, spreading diagonally downwards, corresponding to the inclination of the inclined plate portion 434 on the underside of the chassis 4. The direction of light emission can be changed by adjusting the angle of the inclined plate portion 434 or the irradiation angle of the light source 35.

[0034] <Heat dissipation partition sections 5, 50> Figure 9 is an enlarged cross-sectional view showing portion X of Figure 5. The heat dissipation partitions 5 and 50 shown in Figures 5 to 9 are composed of heat-conducting members that conduct heat.

[0035] The heat dissipation partitions 5 and 50 are heat-conductively joined to the chassis 4. The heat dissipation partitions 5 and 50 dissipate heat generated by the operation of the power module 3 and light source 35 within the light-transmitting cylinder 6 to the outside of the light-transmitting cylinder. The heat dissipation partitions 5 and 50 dissipate heat from the chassis 4 across their entire surface and efficiently dissipate heat through the closed portions 7 and 8 that contact them on their outer surfaces.

[0036] The heat dissipation partitions 5 and 50 are positioned near both ends of the light-transmitting cylinder 6, and in this embodiment, they are joined to the inner openings 72a and 82a that open axially inward at the open end connection portions 72 and 82. The heat dissipation partitions 5 and 50 together with the light-transmitting cylinder 6 and the axially inward portions of the open end connection portions 72 and 82 form the light-emitting chamber 1a.

[0037] The heat dissipation partitions 5 and 50 are fitted inside the inner openings 72a and 82a so as to be in close contact with the inner circumferences of the respective open end connection portions 72 and 82. The heat dissipation partitions 5 and 50 are fixed in such a way as to airtightly close the inner diameters of the open end connection portions 72 and 82.

[0038] As shown in Figure 8, the heat dissipation partitions 5 and 50 are joined to the chassis 4 on which the power module 3 and light source 35 are mounted, thereby constituting the light source unit 20. The light source unit 20 can be formed by simply inserting it into the translucent cylinder 6 to which the open end connection parts 72 and 82 are attached, thereby creating a light-emitting chamber 1a partitioned by the heat dissipation partitions 5 and 50.

[0039] The heat dissipation partitions 5 and 50 are formed from a thermally conductive material such as anodized aluminum. Each heat dissipation partition has a partition plate body 52 and a cylindrical heat dissipation section 54 that is heat-conductively connected to the outer circumference of the partition plate body 52.

[0040] The partition plate body 52 is continuously fixed to both ends of the chassis 4 and divides the lighting device 1 into a light-emitting chamber 1a and two closed chambers (spatial areas) 1b and 1c adjacent to the light-emitting chamber 1a in the axial direction of the light-transmitting cylinder 6.

[0041] The partition plate body 52 is plate-shaped, and in this case is formed from a disc-shaped member, but is not limited to this, and may be formed in any shape such as rectangular, polygonal, or elliptical. The partition plate body 52 is formed to correspond to the shape of the light-transmitting cylinder 6, and by extension, the lighting device 1.

[0042] The partition plate body 52 is joined perpendicularly to each end of the chassis 4 via joints 46. The partition plate body 52 is joined so that the chassis 4 is positioned on the central axis of each partition plate body 52. The partition plate body 52 allows heat from the chassis 4 to be conducted through the joint surface 464 of the joint 46 (see Figures 7 and 8).

[0043] The partition plate body 52 is fixed via a fastening member 77 by surface contact with the annular rib 726 for fixing the open end connection portion 72 that constitutes the closed portion 7, 8.

[0044] The cylindrical heat dissipation section 54 is cylindrical with a predetermined length in the axial direction, and is fixed in close contact with another member on its outer surface, conducting heat from the partition plate body 52 to which it is connected to the other member. The other member is the inner circumferential surface of the cylindrical open end connection section 72, but it may also be the inner circumferential surface of the light-transmitting cylindrical section 6. The outer and inner diameters of the cylindrical heat dissipation section 54 are the same as those of the light-transmitting cylindrical section 6, as shown in Figure 9. In the heat dissipation partition sections 5 and 50, the cylindrical heat dissipation section 54 is formed as a bottomed cylindrical shape integrated with the partition plate body 52.

[0045] The heat dissipation partitions 5 and 50, together with the ends of the light-transmitting cylindrical portion 6, are fitted into the inner openings 72a of the open end connection portions 72 and 82, with a portion of the outer circumference (the entire outer circumference in the case of the heat dissipation partitions) in contact with (preferably in close contact with) the inner circumference of the open end connection portions 72 and 82.

[0046] The heat dissipation partitions 5 and 50 conduct heat from the chassis 4 side through the inner openings 72a and 82a, dissipating it to the outside of the open end connection parts 72 and 82, thereby lowering the temperature inside the chassis 4 and the light-transmitting cylindrical part 6.

[0047] The heat dissipation partition 50, which has the same shape as the heat dissipation partition 5, has an insertion hole (not shown). A connection cable connected to the power module 3 is inserted through the insertion hole of the heat dissipation partition 50, and the connection cable is connected to cable 12 (see Figures 1 and 2). The connection cable may be the same cable as cable 12.

[0048] <Transparent tube part 6> The light-transmitting tube portion 6 is a cylindrical body formed from a light-transmitting material, such as light-transmitting glass or resin. In this embodiment, the light-transmitting tube portion 6 is a cylindrical body made of polycarbonate. Alternatively, the light-transmitting tube portion 6 may be formed to be semi-transparent, allowing a portion of the light emitted from the light source 35 to pass through and the remainder to be reflected.

[0049] <Occluded part 7, 8> The occluding sections 7 and 8, together with the heat dissipation partition sections 5 and 50 in the housing 2, close and seal the light-transmitting cylindrical section 6, forming internal spaces 1b and 1c adjacent to the light-emitting chamber 1a. It is preferable that the occluding sections 7 and 8 are formed of an insulating material.

[0050] The open end connection portion 72 and cap portion 74 of the closure portion 7 and the open end connection portion 82 and cap portion 84 of the closure portion 8 differ in that the cable 12 is inserted through them, but otherwise they have substantially the same shape and substantially the same function. Therefore, the following will mainly describe the closing section 7, and the detailed descriptions of the closing section 8, the opening end connection section 82, and the cap section 84 will be given when describing the closing section 7, with the same name followed by the corresponding reference numerals for the closing section 8.

[0051] In the closed sections 7 and 8, as shown in Figures 5 and 9, the open end connection sections 72 and 82 are attached to both ends (open ends) of the light-transmitting cylinder section 6 and the heat dissipation partition sections 5 and 50, and together with the heat dissipation partition sections 5 and 50, they close the open ends of the light-transmitting cylinder section 6. The cap sections 74 and 84 are attached to the open end connection sections 72 and 82, and close the closed chambers (internal spaces) 1b and 1c of the open end connection sections 72 and 82.

[0052] As shown in Figures 5 and 9, the open end connecting portions 72 and 82 are formed in a cylindrical shape and are joined to the heat dissipation partition portions 5 and 50, respectively, which are located at both ends of the light-transmitting cylindrical portion 6, by fitting them onto the outside.

[0053] The open end connecting portions 72 and 82 are fitted onto the inner openings 72a and 82a so as to make surface contact with both ends of the light-transmitting cylinder portion 6 and the heat dissipation partition portions 5 and 50. At the open end connecting portions 72 and 82, cap portions 74 and 84 are attached to the outer openings 72b and 82b on the opposite side (opposite side in the axial direction) from the inner openings 72a and 82a, respectively, to close the outer openings 72b and 82b.

[0054] At the open end connection portions 72 and 82, the heat dissipation partition portions 5 and 50 are fitted inside, with the partition plate body 52 positioned in the axial middle portion, so that the outer surface of the heat dissipation partition portion 5 and 50 is in close contact with the inner surface of the open end connection portions 72 and 82. Specifically, the open end connection portions 72 and 82 have a predetermined length in the axial direction of the housing 2, and this length defines the size of the enclosed chambers 1b and 1c.

[0055] The open end connection portion 72 has a cylindrical cylindrical portion side connection portion 722 that opens on one side in the axial direction (inside, light-emitting portion side) of the cylindrical body and forms an inner opening 72a, and a cylindrical cap portion side connection portion 724 that opens on the other side in the axial direction (outside) and forms an outer opening 72b.

[0056] An annular rib 726 is provided on the inner circumferential surface of the cylindrical body, separating the cylindrical side connection portion 722 and the cap side connection portion 724 in the axial direction along the outer circumference of the cylindrical body. In addition, a suspension arm 728 is provided protruding from a part of the outer circumference of the cylindrical body at the open end connection portion 72. The suspension arm 728 is fixed to a fixing plate 15 attached to the installation location.

[0057] The heat dissipation partitions 5 and 50 are positioned inside the inner openings 72a and 82a, fitted together with the ends of the light-transmitting cylindrical section 6. Specifically, the outer surfaces of the heat dissipation partitions 5 and 50 and the outer surfaces of the ends of the light-transmitting cylindrical section 6 are in close contact with the inner circumferential surface of the inner opening 72a. An annular fastening member 76 is fitted onto the end of the light-transmitting cylindrical section 6. The fastening member 76 is fitted onto the openings of the inner openings 72a and 82a via an elastic waterproof section 94. As a result, the light-transmitting cylindrical section 6 and the heat dissipation partitions 5 and 50 are fixed to the opening end connection sections 72 and 82. The elastic waterproof section 94 has the function of providing waterproofing by elastically deforming, and is preferably a packing such as an O-ring together with the elastic waterproof section 92.

[0058] The open end connection portion 82 is configured in the same way as the open end connection portion 72 as described above and has the same function. The open end connection portion 82 has a cylindrical side connection portion 722, a cap side connection portion 724, an annular rib 726, and a cylindrical side connection portion, a cap side connection portion, a flange portion, and a suspension arm 828 corresponding to the suspension arm 728 (not shown). The suspension arm 828, together with the suspension arm 728, fixes the lighting device 1 in a suspended state at the installation location.

[0059] The annular rib 726 separates the inner opening 72a and the outer opening 72b inside the cylindrical main body portion of the open end connection portion 72. The annular rib 726 has fastening holes formed on the rib side at positions corresponding to fastening holes provided in the partition plate body 52. ​​The annular rib 726 and the partition plate body 52, that is, the light source unit 20 including the chassis and the open end connection part 72, are joined in an internally fitted state via fastening members 77 inserted into the rib side fastening holes and the fastening holes in the partition plate body 52. ​​The fastening members 77 are made of conductive material, such as bolts and screws.

[0060] The annular rib 726 is annular in shape, but it does not have to be annular; any shape is acceptable as long as it is fixed in contact with the partition plate body 52 in the axial direction and is capable of conducting heat. The configuration and function of the annular rib in the open end connection portion 82 are the same as those of the annular rib 726 in the open end connection portions 72, 82. The annular rib (annular rib 726) is fixed by fastening with the fastening member 77 so that at least a portion of the outer surface of the cylindrical heat dissipation portion 54 of the heat dissipation partition portion 5, 50 is in close contact with the closed portion 7, 8, in a state of surface contact.

[0061] The cap-side connection portion (shown only as 724 in the figure) is sealed by the fitting of the cap portions 74 and 84, respectively. The cap-side connection portion 724 shown in Figure 9 is formed in a bottomed cylindrical shape. The outer circumference of the cap-side connection portion 724 is provided with a male threaded portion that screws into the female threaded portion 744 of the cap portion 74. The cap-side connection portion 724 and the cap portion 74 are fitted together with insulation and waterproofing ensured by screwing them together via the elastic waterproof portion 94. The elastic waterproof portion 92 is the same as the elastic waterproof portion 94.

[0062] The cap portions 74 and 84, together with the open end connection portions 72 and 82, form the closing portions 7 and 8, sealing the translucent tube portion 6 at both ends. The cap portions 74 and 84, together with the open end connection portions 72 and 82, are formed from a resin material such as ABS resin. Preferably, the cap portions 74 and 84, together with the open end connection portions 72 and 82, are formed from a material that has thermal conductivity. Alternatively, the cap portions 74 and 84 may be fixed to both open ends of the translucent tube portion 6 so as to seal both open ends, without using the open end connection portions 72 and 82. In that case, the outer surfaces of the heat dissipation partition portions 5 and 50 are joined in close contact with the inner circumferential surfaces of the cap portions 74 and 84.

[0063] Furthermore, the cap portion 84 at the base end is fitted with an insertion portion 14 through which the cable 12 is inserted in the center. The cable 12 is airtightly inserted through the insertion portion 14 via a nut. In other words, although the cable 12 is inserted into the housing 2, the inside of the housing 2 remains sealed.

[0064] The suspension arms 728 and 828 are provided projecting from a part of the outer circumference of the open end connection parts 72 and 82 (specifically, the upper surface of the outer circumference of the cylindrical body) in a direction perpendicular to the axial direction. When the fixing plate 15 is fixed to the ceiling surface of the tunnel, the lighting device 1 is held suspended from the ceiling surface via the suspension arms 728 and 828. The suspension arms 728 and 828 are formed in a plate shape having a predetermined thickness. Since the suspension arms 728 and 828 are part of the open end connection parts 72 and 82, they are made of resin and have an insulating function.

[0065] The suspension arms 728 and 828 are fixed to the fixing plate 15 via suspension fittings 16. The fixing plate 15 is formed to extend perpendicular to the axial direction of the lighting device 1 and has a length corresponding to the total length of the lighting device 1. The fixing plate 15 is provided with side plates 15a that hang down from both sides that extend in the longitudinal direction.

[0066] The suspension fitting 16 is formed in an L-shape by bending sheet metal, and is provided integrally with the fixing plate 15 by fixing one side to the fixing plate 15. The suspension fitting 16 has another side that hangs down from the fixing plate 15, and the suspension arms 728 and 828 are fixed to this other side. In the suspension fitting 16, one side of the L-shape is fixed to the fixing plate 15 by spot welding or the like, and the other side is arranged to hang down from the fixing plate 15. The suspension arms 728 and 828 are fixed to this other side in a state of close contact with the longitudinal direction of the lighting device 1.

[0067] The suspension arms 728 and 828 are fastened to the suspension hardware 16 via fastening members 18 such as screws. For example, the suspension arms 728 and 828 have through holes that penetrate in the thickness direction, and the other side of the suspension hardware 16 has a female threaded portion formed by burring at a position corresponding to the through hole.

[0068] The shaft portion of a fastening member, such as a screw, is inserted into the through-hole of the suspension arms 728 and 828, and the head of the fastening member is locked to the surface. The shaft portion is inserted through the through-hole of the suspension arms 728 and 828 and screwed into the female thread portion. In this way, the suspension arms 728 and 828 are fastened to the suspension hardware 16 in the thickness direction, that is, in the axial direction of the lighting device 1, and the lighting device 1 is fixed to the fixing plate 15. Note that the lighting devices 1, 1A, 1B, and 1C of this embodiment (including the lighting devices of each modified example described later) are fixed in a suspended state on the fixing plate 15 by screwing the fastening member into the burred female thread portion, and do not use nuts, but the invention is not limited to this. Alternatively, a through hole may be provided on the other side of the suspension fitting 16 instead of a female threaded portion, and a shaft portion through which the suspension arms 728 and 828 are inserted may be inserted, with a nut screwed onto the tip of the shaft portion. In this way, the suspension arms 728 and 828 and the suspension fitting 16 are fastened together, and the lighting devices 1, 1A, 1B, and 1C are fixed in a suspended state on the fixing plate 15.

[0069] In the lighting device 1, power is supplied to the power module 3 to make the light source 35 emit light. The light source 35 illuminates at an angle of approximately 45° to the left and right, centered on a vertical plane containing the central axis at the lower part of the chassis 4 42 of the lighting device 1. When the light source 35 emits light, the power module 3 and the LED light source 35 generate heat, and this heat is transferred through the chassis 4 to both ends of the chassis 4 and conducted to the heat dissipation partitions 5 and 50.

[0070] The lighting device 1 has a housing 2 formed by housing a power module 3 in a light-transmitting cylindrical portion 6 and closing both ends of the light-transmitting cylindrical portion 6 with closing portions 7 and 8. The housing 2 is equipped with a heat dissipation partition portion 5 (50) that partitions the inside of the housing 2. In this embodiment of the lighting device 1, by dividing the hollow housing 2 into multiple spatial regions, a temperature difference is created between the heat source and the surrounding space. This temperature difference generates a heat flow, allowing for efficient heat dissipation to the outside.

[0071] The heat dissipation partition section 5(50) is a partition plate body 52 joined to both ends of the chassis 4, partitioning the inside of the housing, and the outer surface of the cylindrical heat dissipation section 54 joined to the outer circumference of the partition plate body 52 is in contact with the inner surfaces of the open end connection sections 72 and 82. In detail, the open end connection section 72 is positioned to contact the corner between the inner surface of the cylindrical section side connection section 722 and the outer circumference of the annular rib 726. The open end connection section 82 is similarly in contact with the heat dissipation partition section 50.

[0072] As a result, when the chassis 4 itself is heated by the light emitted from the light source 35, the heat is transmitted to the partition plate body 52 via the joints 46 at both ends, where the heat is dissipated by the partition plate body 52 and also by the cylindrical heat dissipation section 54. Since the cylindrical heat dissipation section 54 is in close contact with the cylindrical side connection section 722 of the open end connection section 72, the heat from the light source 35 is transmitted from the cylindrical side connection section 722 to the open end connection section 72 through the entire contact area, and the heat is dissipated by the open end connection section 72.

[0073] This allows the heat generated by the light source 35 to be efficiently dissipated throughout the entire lighting device 1. Furthermore, even if the light source 35 is a heat-sensitive LED (known to begin degrading at temperatures above 80°C), the temperature inside the light-emitting chamber 1a can be easily prevented from rising. As a result, even in a tunnel, and even if the LED is powered by the power module 3, it can be used to emit light stably.

[0074] According to the lighting device 1, in addition to the light-emitting chamber 1a being separated from the enclosed chambers 1b and 1c, heat is dissipated in the enclosed chambers 7 and 8 via the heat dissipation partition 5(50) and the heat dissipation partition 5(50). This makes it possible to more effectively prevent the temperature inside the light-emitting chamber 1a from rising, and to keep the room temperature inside the light-emitting chamber 1a in the tunnel below a predetermined temperature (for example, below 60°C when the outside temperature is 40°C).

[0075] According to lighting device 1, miniaturization is possible, and heat is dissipated efficiently, allowing for stable and long-term use.

[0076] <Variation> In the following, modifications of lighting device 1 will be described, primarily focusing on the heat dissipation partition section. In lighting devices 1A to 1C of each modification, the same reference numerals will be used for parts similar to lighting device 1, and the description will focus on the differences.

[0077] <Example 1> Figure 10 is a longitudinal cross-sectional view illustrating the main components of Modified Example 1 of the lighting device according to an embodiment of the present invention. Figure 11 is a cross-sectional view corresponding to the cross-sectional view along line CC in Figure 10, and shows the positional relationship between the heat dissipation partition and the light-transmitting cylinder in the lighting device of Modified Example 1. Figure 12 is an enlarged cross-sectional view showing portion X1 in Figure 10.

[0078] The lighting device 1A, shown in Figures 10 to 12 as Modification 1, differs from lighting device 1 in the configuration of both ends of the light-transmitting cylinder 6A, the heat dissipation partitions 5A and 50A, and the opening end connection parts 72A and 82A of the closing parts 7A and 8A, but the other configurations are the same.

[0079] The open end connection sections 72A and 82A have the same function as the open end connection sections 72 and 82, but the arrangement structure of the light-transmitting cylindrical section 6A and the heat-dissipating partition sections 5A and 50A within the inner openings 72a and 82a is different compared to the open end connection sections 72 and 82.

[0080] In the lighting device 1A, both ends of the translucent cylindrical portion 6A (ends 62 in Figure 12) are fitted into the inner openings 72a, 82a of the open end connection portions 72A, 82A of the closed portions 7A, 8A. At this time, both ends of the translucent cylindrical portion 6A abut against the inner circumferential surface of the cylindrical portion side connection portion 722A with their respective outer circumferential surfaces, and abut against the annular rib 726A at the open end.

[0081] The inner openings 72a, 82a of the open end connection parts 72A, 82A are fitted with the ends of the translucent cylindrical part 6A, which has the heat dissipation partition parts 5A, 50A fitted inside. Specifically, the outer surface of the end of the translucent cylindrical part 6A abuts against the inner surface of the cylindrical part side connection part 722A in the inner openings 72a, 82a, and heat is conducted from the translucent cylindrical part 6A to the cylindrical part side connection part 722A. In addition, the outer surface of the cylindrical heat dissipation part 54A abuts against the inner surface of the translucent cylindrical part 6A, and heat is conducted from the cylindrical heat dissipation part 54A to the translucent cylindrical part 6A.

[0082] Furthermore, at the inner openings 72a and 82a, the open end of the light-transmitting tube portion 6A and the outer surface of the partition plate body 52A come into contact with the light source side surface of the annular rib 726A and the inner circumferential surface of the tube portion side connection portion 722A, allowing heat conduction between them.

[0083] The fastening annular member 76 is fitted onto the opening of the inner opening 72a via the elastic waterproof portion 94. Similarly to the outer opening 72b of the opening end connection portion 72 of the closing portion 7, the female threaded portion 744 of the cap portion 74 is screwed onto the outer circumference of the cap portion side connection portion 724A via the elastic waterproof portion 92, and the outer opening 72b is closed by the cap portion 74.

[0084] The heat dissipation partitions 5A and 50A of the lighting device 1A are joined to both ends of the chassis 4 via joints 46 in a heat conduction manner, similar to the heat dissipation partitions 5 and 50 of the lighting device 1A. Each heat dissipation partition section 5A and 50A comprises a partition plate body 52A and a cylindrical heat dissipation section 54A connected to the outer circumference of the partition plate body 52A in a heat-conductive manner, and is formed in a bottomed cylindrical shape with the cylindrical heat dissipation section 54A protruding from the outer circumference of the partition plate body 52A.

[0085] The cylindrical heat dissipation section 54A is positioned inside the light-transmitting cylindrical section 6A, in contact with the inside of the light-transmitting cylindrical section 6A. It is preferable that the outer surface of the cylindrical heat dissipation section 54A is in surface contact with the light-transmitting cylindrical section 6A. The partition plate body 52A of the heat dissipation partition sections 5A and 50A is in surface contact with the annular rib 726A, along with the open end of the light-transmitting tube section 6A.

[0086] In other words, the heat dissipation partitions 5A and 50A are fitted inside the inner openings 72a and 82a together with both ends of the light-transmitting cylinder 6A, and are positioned in close contact with the inner surfaces of the open end connection parts 72 and 82 together with both ends of the light-transmitting cylinder 6A. The heat dissipation partitions 5A and 50A are fixed together with the light-transmitting cylinder 6A so as to airtightly close the inner diameter of the open end connection parts 72A and 82A.

[0087] In this configuration, the heat generated by the light source is transmitted to the heat dissipation partitions 5A and 50A via the chassis 4, and then dissipated from the partition plate body 52A and the cylindrical heat dissipation section 54A. The partition plate body 52A is in contact (surface contact in this case) with the annular rib 726A, and the outer surface of the cylindrical heat dissipation section 54A is in contact with the light-transmitting cylindrical section 6A.

[0088] The heat conducted to the partition plate body 52A is transferred to the annular rib 726A and then to the cap portion 74 via the cap portion side connection portion 724A. The heat conducted to the cylindrical heat dissipation portion 54A is transferred to the cylindrical portion side connection portion 722A and the annular rib 726A via the translucent cylindrical portion 6A, the open end connection portion 72A dissipates heat, and the open end connection portion 72A itself and the cap portion 74 dissipate heat. Thus, in the closed sections 7 and 8, heat can be dissipated not only by the partition plate body 52A but also by the cylindrical heat dissipation section 54A, through external members that come into contact with each of them, such as the open end connection section 72A.

[0089] <Modification 2> Figure 13 is a longitudinal cross-sectional view illustrating the main components of a modified example 2 of the lighting device according to an embodiment of the present invention; Figure 14 is a cross-sectional view corresponding to the cross-sectional view along line DD in Figure 13; and Figure 15 is an enlarged cross-sectional view showing portion X2 in Figure 13.

[0090] The lighting device 1B, shown in Figures 13 to 15 as Modification 2, differs from lighting device 1 in the configuration of both ends of the light-transmitting cylinder 6B, the heat dissipation partitions 5B and 50B, and the opening end connection parts 72B and 82B of the closing parts 7B and 8B, but the other configurations are the same.

[0091] The main difference between lighting device 1B and lighting device 1 is that, among the bottomed cylindrical heat dissipation partitions 5B and 50B, the cylindrical heat dissipation section 54B that constitutes the peripheral wall is provided at the open end connection section 72B.

[0092] In the lighting device 1B shown in Figures 13 to 15, both ends of the light-transmitting cylindrical portion 6B are closed by axial contact with the partition plate body 52B of the heat dissipation partition portions 5B and 50B. With both ends of the light-transmitting cylindrical portion 6B closed by the partition plate body 52B, it is fitted into the inner openings 72a, 82a of the open end connection portions 72B, 82B of the closed portions 7B, 8B.

[0093] Furthermore, the outer circumferential surface of the end portion 62 of the translucent tube portion 6B abuts against and is fixed to the inner circumferential surface of the cylindrical tube portion side connecting portion 722. Note that in the open end connecting portion 72B, the configuration on the outer opening 72b (82b) side and the configuration on the 728B side are the same as the configuration on the outer opening 72b (82b) side of the open end connecting portion 72 and the configuration on the suspension arm 728 side, so the same reference numerals are used and their explanation is omitted.

[0094] The heat dissipation partitions 5B and 50B are joined to both ends of the chassis 4 via joints 46 in a heat conduction manner, similar to the heat dissipation partitions 5 and 50 of the lighting device 1B. Each heat dissipation partition section 5B and 50B comprises a partition plate body 52B and a cylindrical heat dissipation section 54B that is heat-conductively joined to the outer circumference of the partition plate body 52B.

[0095] The partition plate body 52B is positioned within the inner opening 72a so as to close the opening of the annular rib 726B. The partition plate body 52B is positioned in surface contact with the annular rib 726B.

[0096] The partition plate body 52B is positioned at the concave bottom of the inner opening 72a such that its outer surface abuts against the inner surface of the cylindrical cylindrical connecting portion 722B that constitutes the peripheral wall portion of the inner opening 72a. The outer surface of the partition plate body 52B abuts against the end 62 of the translucent cylindrical portion 6B that fits inside the inner surface of the inner opening 72a.

[0097] The cylindrical heat dissipation section 54B, which contacts the outer surface of the partition plate body 52B, is embedded within the open end connection section 72 with a portion exposed to the outside, and is provided integrally with the open end connection section 72. The cylindrical heat dissipation section 54B is provided such that its inner circumferential surface forms part of the inner circumferential surface of the inner opening 72a, with the inner circumferential surface exposed inside the inner opening 72a, and connected to the partition plate body 52B at the exposed portion. The cylindrical heat dissipation section 54B and the partition plate body 52B may be joined or welded in a way that allows heat to conduct.

[0098] Since the cylindrical heat dissipation section 54B is made of a material with thermal conductivity, such as metal, it is insert-molded into the open end connection section 72 as an insert part. The outer surface of the cylindrical heat dissipation section 54B is securely in contact with the open end connection section 72, allowing it to conduct heat to the open end connection section 72 and dissipate heat effectively.

[0099] In the lighting device 1B, the partition plate body 52B is solid and plate-shaped, and is joined at both ends of the chassis 4 on which the light source 35 is mounted. The partition plate body 52B is connected to the cylindrical heat dissipation section 54B inside the cylindrical heat dissipation section 722B within the inner opening 72a of the cylindrical heat dissipation section 722B, allowing for heat conduction. Furthermore, the partition plate body 52B is in close contact with the annular rib 726B in the axial direction, allowing for free heat conduction between them.

[0100] In this configuration, the heat generated by the light source is transmitted to the heat dissipation partitions 5B and 50B via the chassis 4, and then dissipated from the partition plate body 52B and the cylindrical heat dissipation section 54B. The partition plate body 52B is in contact (surface contact in this case) with the annular rib 726B, and the outer surface of the cylindrical heat dissipation section 54B is in contact with the light-transmitting cylindrical section 6B, so heat is transferred to the contact points.

[0101] In particular, the heat conducted to the cylindrical heat dissipation section 54B is conducted to the cylindrical side connection section 722B, and the heat is dissipated by the entire open end connection section 72B. In the closed sections 7B and 8B, in addition to the partition plate body 52B, heat can also be dissipated by the cylindrical heat dissipation section 54B and the external members in contact with them, such as the open end connection section 72B.

[0102] <Variation 3> Figure 16 is a longitudinal cross-sectional view illustrating the main components of a modified example 3 of the lighting device according to an embodiment of the present invention, and Figure 17 is a cross-sectional view corresponding to the cross-sectional view along line EE in Figure 16. Figure 18 is an enlarged cross-sectional view showing portion X3 in Figure 16.

[0103] The lighting device 1C, shown in Figures 16 to 18 as modified example 3, differs from lighting device 1 in the configuration of the heat dissipation partitions 5C and 50C, and the opening end connection parts 72C and 82C of the closing parts 7C and 8C, but the other configurations are the same.

[0104] The main difference between the lighting device 1C and the lighting device 1 is that the tubular heat dissipation section 54C of the heat dissipation partition section 5C, 50C, which is configured as a covered cylindrical shape, has a cylindrical reinforcing heat dissipation section 540 that abuts against the cylindrical heat dissipation section 54C on its outer circumference. The reinforcing cylindrical heat dissipation section 540 is provided at the open end connection section 72C. The lighting device 1C will now be described in detail.

[0105] In the lighting device 1C shown in Figures 16 to 18, both ends of the light-transmitting cylindrical section 6C are fitted together with the heat dissipation partition sections 5C and 50C at the inner openings 72a and 82a of the open end connection sections 72C and 82C.

[0106] In addition, the configuration of the outer opening 72b (82b) and the suspension arm 728C in the open end connection portion 72C are the same as those of the lighting device 1, so the same reference numerals are used and their explanation is omitted.

[0107] The heat dissipation partitions 5C and 50C are joined to both ends of the chassis 4 via joints 46 in a heat conduction manner, similar to the heat dissipation partitions 5 and 50 of the lighting device 1.

[0108] The heat dissipation partitions 5C and 50C have a covered cylindrical portion 520, which has the same configuration as the heat dissipation partitions 5 and 50, and a reinforcing cylindrical heat dissipation portion 540, which is located at the cylindrical portion side connecting portion 722C that constitutes the peripheral wall portion of the inner opening 72a.

[0109] The covered cylindrical section 520 is configured to close the openings at both ends of the light-transmitting cylindrical section 6C. The outer diameter of the cylindrical heat dissipation section 54C is the same as the outer diameter of the peripheral wall portion of the light-transmitting cylindrical section 6C, and it is configured to have the same inner diameter and thickness.

[0110] In other words, the covered cylindrical portion 520 and the transparent cylindrical portion 6C are fitted into the inner opening 72a (82a) with their openings facing each other.

[0111] The covered cylindrical section 520 is configured similarly to the heat dissipation partition sections 5 and 50 of the lighting device 1, and is formed as a covered cylindrical shape integrally having a disc-shaped partition plate body 52C fixed to the chassis 4 and a cylindrical heat dissipation section 54C that is heat conductably joined to the outer circumference of the partition plate body 52C.

[0112] The partition plate body 52C is positioned inside the inner opening 72a so as to close the opening of the annular rib 726C, and partitions the light-emitting chamber 1a from the closed chambers 1b and 1c. In the covered cylindrical section 520, the partition plate body 52C that constitutes the lid is in axial surface contact with the annular rib 726C, allowing for heat conduction.

[0113] Furthermore, the outer circumferential surface of the cylindrical heat dissipation section 54C is in contact with the inner circumferential surface of the reinforcing cylindrical heat dissipation section 540 provided on the cylindrical section side connection section 722C. The outer surface of the translucent cylindrical section 6C, which is flush with the outer surface of the cylindrical heat dissipation section 54C, is in contact with the inner surface of the cylindrical section side connection section 722C.

[0114] The reinforcing cylindrical heat dissipation section 540 is embedded within the open end connection section 72C with its inner circumferential surface exposed to the outside, and is integrally provided with the open end connection section 72.

[0115] The reinforcing cylindrical heat dissipation section 540 has the same inner diameter at the open end connection section 72C as the cylindrical cylindrical section side connection section 722C that constitutes the peripheral wall portion of the cylindrical inner opening 72a.

[0116] The reinforcing cylindrical heat dissipation section 540 contacts the outer circumferential surface of the covered cylindrical section 520, that is, the outer circumferential surface of the cylindrical heat dissipation section 54C. It is desirable that the reinforcing cylindrical heat dissipation section 540 makes full surface contact with the outer circumferential surface of the covered cylindrical section 520.

[0117] The reinforcing cylindrical heat dissipation section 540 is conductive and is positioned to surround the outer circumference of the cylindrical heat dissipation section 54C of the covered cylindrical section 520 in contact with it at the inner opening 72a.

[0118] In this modified example, the reinforcing cylindrical heat dissipation section 540 is formed to have the same axial length as the cylindrical heat dissipation section 54C, and the heat radiated from the outer surface of the cylindrical heat dissipation section 54C is conducted to its entire surface. The reinforcing cylindrical heat dissipation section 540 effectively conducts the heat conducted from the chassis 4 to the cylindrical section side connection section 722C, whose outer surface is embedded.

[0119] The reinforcing cylindrical heat dissipation section 540 and the covered cylindrical section 520 can be connected in any way, as long as they are connected in a way that allows heat to be conducted from the covered cylindrical section 520 to the reinforcing cylindrical heat dissipation section 540. The two can be connected by contact, by welding or other joining methods, by fastening members, or by adhesives.

[0120] The reinforcing cylindrical heat dissipation section 540 is made of a thermally conductive material such as metal. The reinforcing cylindrical heat dissipation section 540 is insert-molded into the open end connection section 72 as an insert part. With this configuration, the outer surface of the reinforcing cylindrical heat dissipation section 540 is securely in close contact with the open end connection section 72, allowing heat to be conducted to the open end connection section 72 and dissipated effectively.

[0121] Thus, in the lighting device 1C, the partition plate body 52C is solid and plate-shaped, and is joined at both ends of the chassis 4 on which the light source 35 is mounted. The partition plate body 52C is connected to the cylindrical heat dissipation section 54C inside the cylindrical heat dissipation section 722C within the inner opening 72a of the cylindrical heat dissipation section 722C, allowing for heat conduction. Furthermore, the partition plate body 52C is in close contact with the annular rib 726C in the axial direction, allowing for free heat conduction between them.

[0122] In this configuration, heat generated by the light source is transferred to the heat dissipation partitions 5C and 50C via the chassis 4, and then dissipated from the covered cylindrical section 520 (partition plate body 52C and cylindrical heat dissipation section 54C) and the reinforcing cylindrical heat dissipation section 540. The partition plate body 52C is in contact (surface contact in this case) with the annular rib 726C, and the outer surface of the cylindrical heat dissipation section 54C is in contact with the light-transmitting cylindrical section 6C, so heat is transferred to the contact points.

[0123] In particular, the heat conducted to the cylindrical heat dissipation section 54C is conducted to the cylindrical side connection section 722C, and the heat is dissipated throughout the entire open end connection section 72C. In the closed sections 7C and 8C, heat can be dissipated not only by the partition plate body 52C but also by the cylindrical heat dissipation section 54C, through external members that come into contact with each section, such as the open end connection section 72C.

[0124] The heat dissipation partitions 5, 5A-5C, 50, 50A-50C may be configured in any way as long as the outer surface of the cylindrical heat dissipation portion contacts the inner surface of the other closed portions and makes contact over as wide an area as possible. For example, as in the heat dissipation partition 5D of Modified Example 4 of the lighting device shown in Figures 19 and 20, the cylindrical heat dissipation portion, which protrudes vertically from the outer edge of the partition plate body 52D, may be configured to expand and contract in the radial direction.

[0125] The heat dissipation partition 5D is made of a conductive and elastically deformable material, and a notch 544 is provided in a portion of the cylindrical heat dissipation section 54D that extends in the circumferential direction. In addition, slits 546 are intermittently formed in the heat dissipation partition 5D at the connection point with the partition plate body 52.

[0126] Furthermore, the outer diameter of the cylindrical heat dissipation section 54D is the same as the inner diameter of the component to be fitted inside, such as the open end connection section or the light-transmitting cylindrical section, or is formed to a size that allows for fitting across the entire outer surface.

[0127] In this configuration, the heat dissipation partition 5D is formed such that the cylindrical heat dissipation portion 54D can be freely reduced in diameter radially relative to the partition plate body 52D. When the heat dissipation partition 5D is inserted into the open end connection portion (open end connection portion 72, etc.), it can be inserted with its outer diameter reduced. After the heat dissipation partition 5D is inserted into the open end connection portion (open end connection portion 72, etc.) and positioned, the reduced diameter state of the cylindrical heat dissipation portion 54D can be released and its diameter expanded so that its outer surface can be brought into full contact with the inner surface of the open end connection portion.

[0128] Furthermore, as shown in the modified example 5 of the lighting device in Figures 21 and 22, the heat dissipation partition 5E in the lighting device 1 configuration may be configured such that the cylindrical heat dissipation portion, which protrudes vertically from the outer edge of the partition plate body 52E, expands and contracts in the radial direction of the partition plate body 52E.

[0129] Figure 21 is a diagram illustrating the heat dissipation partition in a modified example 6 of the lighting device according to an embodiment of the present invention, and Figure 22 is a diagram showing the mounting structure of the heat dissipation partition as seen from direction G on the outer opening side with the cap removed in Figure 21.

[0130] In the heat dissipation partition 5E of the lighting device of Modification 6, a cylindrical heat dissipation portion 54E is provided on the outer circumference of a partition plate body 52E, similar to the partition plate body 52 of Embodiment 1, so as to extend in both directions in the thickness direction of the partition plate body 52E.

[0131] In other words, the cylindrical heat dissipation section 54E has an inner heat dissipation section 547 that extends from the outer periphery of the partition plate body 52E toward the inner opening 72a of the closing section 7E, and an outer heat dissipation section 548 that extends toward the outer opening 72b of the closing section 7E.

[0132] At the open end connection portion 72E of the closed portion 7E, the cylindrical portion side connection portion 722E and the cap portion side connection portion 724E have the same inner diameter, and the inner opening 72a and the outer opening 72b form a continuous inner circumferential surface that is flush with the surface.

[0133] The outer circumferential surface of the cylindrical heat dissipation section 54E is formed to contact the inner circumferential surface of the open end connection section 72E (specifically, the portion of the inner circumferential surface of the open end connection section 72E between the inner opening 72a and the outer opening 72b) over the widest possible area.

[0134] The inner heat dissipation section 547 is a cylindrical body and has the same configuration as the cylindrical heat dissipation sections 52, 52A, 52C, etc. The outer circumferential surface of the inner heat dissipation section 547 is in contact with the inner circumferential surface of the cylindrical cylindrical section side connection section 722E (in Figure 21, this also includes the portion between the inner opening 72a and the outer opening 72b on the inner circumferential surface of the open end connection section 72E) and is positioned in the closing section 7E.

[0135] The outer heat dissipation section 548 has a shape in which a notch 549 is provided in a part of the cylindrical body. The outer heat dissipation section 548 has arc-shaped wall portions provided at intervals with the notches 549 in the circumferential direction. The outer circumferential surface of the outer heat dissipation section 548 abuts against the inner circumferential surface of the cap-side connection section 724E. It is desirable that the outer surfaces of both the inner heat dissipation section 547 and the outer heat dissipation section 548 make full contact with the inner circumferential surfaces of the cylindrical-side connection section 722E and the cap-side connection section 724E.

[0136] Within the notch 549, an attachment rib 726E is positioned, protruding inward from the inner circumferential surface of the open end connection portion 72E. The partition plate body 52E of the heat dissipation partition portion 5E is joined to this attachment rib 726 via a fastening member 77. The partition plate body 52E is joined to the attachment rib 459 by surface contact, allowing for smooth heat conduction from the partition plate body 52E to the attachment rib 459.

[0137] In this configuration, at the closed end portion 7E of the lighting device, the heat dissipation partition portion 5E and the end portion of the light-transmitting cylindrical portion 6 are arranged inside the cylindrical open end connection portion 72, and the internal space is partitioned by the partition plate body 52E of the heat dissipation partition portion 5E.

[0138] In the heat dissipation partition 5E, the cylindrical heat dissipation portion 54E is arranged to extend axially from the inner opening 72a side to the outer opening 72b side. The heat dissipation partition 5E is arranged so as to be in full contact with the inner surface of the cylindrical heat dissipation portion 54E, which constitutes the inner opening 72a, and the inner surface of the cap-side connection portion 724E which constitutes the outer opening 72b.

[0139] As a result, heat can be dissipated from the partition plate body 52E that divides the internal space of the open end connection portion 72 to the outside via the inner circumferential surface of the open end connection portion 72 on both the axially inward light source side and the axially outward side, allowing for more effective heat dissipation and lowering the temperature inside the light-transmitting cylinder portion 6.

[0140] Embodiments of the present invention have been described above. It should be noted that the above description illustrates preferred embodiments of the present invention, and the scope of the present invention is not limited thereto. In other words, the description of the configuration of the apparatus and the shape of each part is merely an example, and it is clear that various modifications and additions to these examples are possible within the scope of the present invention. [Industrial applicability]

[0141] The lighting device according to the present invention can be miniaturized, has the effect of efficiently dissipating heat and being able to be used stably for a long time, and is useful as a lighting device installed in tunnels. [Explanation of symbols]

[0142] 1, 1A, 1B, 1C lighting equipment 1a Light-emitting chamber (light-emitting area) 1b,1c Closed chamber (adjacent area) 2 cabinets 3. Power supply module (light-emitting part) 4 Chassis 5, 5A, 5B, 5C, 5D thermal partition 6, 6A, 6B, 6C Translucent cylinder part 7, 7A, 7B, 7C, 8, 8A, 8B, 8C Occlusion 12 Cables 13. Molded receptacle 14 Insertion part 15 Fixed plate 15a side plate 16. Hanging hardware 18, 77 Fastening members 20 light source units 35 Light source (light-emitting part) 42 Power supply mounting section 43 Light source mounting section 44 Legs 46 Joint 50, 50A, 50B, 50C, 50D Heat dissipation partition section 52, 52A, 52B, 52C, 52D Partition plate body (partition section body) 54, 54A, 54B, 54C, 54D Cylindrical heat dissipation section 62 End 72, 72A, 72B, 72C, 82, 82A, 82B, 82C Open end connection part (end connection part) 72a, 82a inner opening 72b, 82b outer opening 74, 84 Cap section 76 Fastening annular member 92, 94 Elastic waterproof section 432 Mounting plate section 434 Inclined plate section 520 Covered tube part 540 Reinforcing cylindrical heat dissipation part 544 Notches 546 has a slit 722, 722A, 722B, 722C Cylinder side connection part 724, 724A Cap side connection 726, 726A, 726B, 726C Ribs 728, 728A, 728B, 728C, 828, 828A, 828B, 828C Suspension Arm 744 Female thread section

Claims

1. In a lighting device having a housing formed by housing a light-emitting part within a light-transmitting cylindrical part and closing both ends of the light-transmitting cylindrical part with closing parts, The closing portion has a cylindrical end connecting portion that fits onto the open end of the light-transmitting tube portion. Within the cylindrical end connection portion, a heat dissipation partition portion is provided that divides the inside of the housing into a light-emitting region housing the light-emitting portion and an adjacent region in the extending direction of the housing, and which has heat conductivity. The heat dissipation partition section is, The enclosure comprises a plate-shaped partition body that divides the inside of the enclosure, Within the end connection portion, there is a cylindrical heat dissipation portion connected to the outer circumference of the partition body and extending in the extending direction, The cylindrical heat dissipation portion has an outer circumferential surface extending in the extending direction that abuts against the end connection portion or the inner circumferential surface of the light-transmitting cylindrical portion. Lighting device.

2. The partition body and the cylindrical heat dissipation section are integrated. The lighting device according to claim 1.

3. The cylindrical heat dissipation section is a cylindrical body having the same diameter as the light-transmitting cylindrical section, and the annular end of the cylindrical heat dissipation section is in contact with the end of the light-transmitting cylindrical section, and together with the end of the light-transmitting cylindrical section, it is fitted inside the end connection section. The lighting device according to claim 2.

4. The end connection portion is formed in a conductive cylindrical shape and has a reinforcing cylindrical heat dissipation portion that abuts against the outer circumference of the cylindrical heat dissipation portion. The lighting device according to claim 3.

5. The reinforcing cylindrical heat dissipation section is integrated with the end connection section by insert molding. The lighting device according to claim 4.

6. The cylindrical heat dissipation section is provided in close contact with the end connection section. The lighting device according to claim 1.

7. The cylindrical heat dissipation portion is integrated with the end connection portion by insert molding. The lighting device according to claim 6.

8. The light-emitting part is fixed to a chassis that extends in the extending direction and has thermal conductivity. The partition body is joined to each of the ends of the chassis in a state of contact with each end at a right angle. The lighting device according to any one of claims 1 to 7.

9. The cylindrical end connection portion has ribs protruding inward from the cylindrical main body portion of the end connection portion, The partition body is connected to the rib by surface contact in the axial direction. The lighting device according to claim 1.

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