JP2020087545A - Luminaire - Google Patents

Abstract

To provide a luminaire capable of further improving a heat radiation characteristic.SOLUTION: A luminaire 1 comprises upper and lower light source units in which light sources are provided on surfaces of heat sinks 301A and 301B. The heat sinks 301A and 301B comprises heat pipes 303A, 303B that cylindrically extend in a front-back direction and is filled with hydraulic fluid inside, and a plurality of fins 304A, 304B provided on outer peripheral surfaces of the heat pipes 303A, 303B. The plurality of fins 304A in the upper light source unit extend so as to restrict air heated by the lower light source unit from touching the heat pipe 303A.SELECTED DRAWING: Figure 7

Description

The present invention relates to an illuminating device including a light source unit having a light source provided on a surface of a heat sink, which is provided above and below.

A high-output type lighting device including a light source unit at the top and bottom has been proposed (for example, Patent Document 1).
The illuminating device described in the patent document is, for example, "in a lighting fixture in which a light source has a light emitting element substrate on which a light emitting element is mounted, the light emitting element substrate is attached, and the heat of the light emitting element substrate is transferred. A board mounting member made of a high heat conductive material, the housing mounting member is provided with an engagement hole that engages with the board mounting member partially exposed to the outside of the housing. An electric insulating material is provided at a contact point between the housing and the engagement hole of the housing, and the board mounting member includes a heat dissipation portion that protrudes from the engagement hole outside the housing and dissipates heat of the light emitting element board. The heat radiating portion is provided with a heat radiating fin arranged outside the housing, and a heat pipe for transmitting the heat of the light emitting element substrate to the heat radiating fin."

JP, 2014-235820, A

Although the lighting device as described above has improved heat dissipation characteristics, there is a demand for further improvement in heat dissipation characteristics.
An object of the present invention is to provide a lighting device that can further improve heat dissipation characteristics.

The lighting device according to the present invention includes a light source unit having a light source provided on a surface of a heat sink, which is provided above and below the heat sink. A pipe, and a plurality of fins provided on the outer peripheral surface of the heat pipe, wherein the plurality of fins in the upper light source unit is air heated by the lower light source unit in the heat pipe. It is stretched to regulate touching.

According to the above configuration, the heat pipe of the upper light source unit is prevented from being heated by the lower light source unit.

It is the perspective view which looked at the illuminating device concerning an embodiment from the front side upper part. It is the perspective view which looked at the illuminating device from the back side upper part. It is a longitudinal cross-sectional view of an illuminating device. It is the perspective view which looked at the disassembled state of a light source set from the front side upper part. It is a longitudinal cross-sectional view of a light source unit, and is a partially enlarged view. (A) is an enlarged perspective view of the cross section of the light source unit as seen from above the front side, and (b) is an enlarged perspective view of the cross section of the light source unit as seen from above the back side. It is a figure which shows the positional relationship of a heat sink. It is the figure which looked at the heat sink which concerns on 2nd Embodiment from the back side. It is a figure which shows a test result. It is a figure of the illuminating device concerning a modification, (a) is a perspective view and (b) is a sectional view.

<Outline>
A lighting device according to one aspect of the embodiment is a lighting device that includes a light source unit in which light sources are provided on a surface of a heat sink, and the heat sink extends cylindrically in a front-back direction and is filled with a working liquid. The heat pipe and a plurality of fins provided on the outer peripheral surface of the heat pipe, the plurality of fins in the upper light source unit, the air heated in the lower light source unit is the It is stretched to regulate the contact with the heat pipe.
In the lighting device according to another aspect of the embodiment, among the plurality of fins in the upper light source unit, a lower fin located below the cylinder axis of the heat pipe is orthogonal to the vertical direction and the front-back direction. It has a transversely extending portion extending along the transverse direction. This can prevent the heat pipe of the upper light source unit from being heated by the lower light source unit.
In the lighting device according to another aspect of the embodiment, the lower fin has a radial extension portion that extends in a radial direction from the heat sink, and the lateral extension portion extends from an extension tip of the radial extension portion. This can increase the length of the fin per volume.

In the lighting device according to another aspect of the embodiment, the heat pipe has grooves having a depth of 0.2 to 0.5 mm, extending in the cylinder axis direction, and having a circumferential pitch of 0.2 to 0.6 mm. It has on the inner peripheral surface. This can improve the heat dissipation characteristics of the heat pipe.
In the lighting device according to another aspect of the embodiment, the light source unit includes a housing that houses the heat sink, and the housing has a plurality of through holes on a lower surface facing the heat sink. Thereby, the wind can pass through the inside of the housing, and the heat dissipation characteristics of the heat sink are improved.
In the lighting device according to another aspect of the embodiment, the light source unit includes a housing that houses the heat sink, and the housing has a plurality of through holes on a surface facing the heat sink. Thereby, the wind can pass through the inside of the housing, and the heat dissipation characteristics of the heat sink are improved.

In the lighting device according to another aspect of the embodiment, the housing has a box shape in which a part of the surface is opened, and the heat sink is fixed to the surface of the housing with the light source exposed from the opening. In the light source unit, a cover that covers the light source from the front side is attached to the surface of the housing via a packing, and the packing has a convex portion at a portion in contact with the cover, and the cover is the packing. A concave portion that fits with the convex portion is provided at a portion that comes into contact with. Thereby, the hermeticity can be improved.
In a lighting device according to another aspect of the embodiment, a power supply unit that supplies lighting power to the upper and lower light source units is provided on the back surface of the housing, and the power supply unit is from the back side in the extending direction of the tubular axis of the heat pipe. When viewed, they are arranged so as to straddle the upper and lower light source units. Thereby, the heat radiation balance between the upper and lower light source units can be secured.
An illumination device according to another aspect of the embodiment includes a connector fixed to the upper and lower light source units and connecting the upper and lower light source units, wherein the connector locks the covers of the upper and lower light source units from the front side. It has a locking part. This can prevent the cover from coming off.

<First Embodiment>
1. As shown in FIG. 1, the whole lighting device 1 includes two light source sets arranged vertically (an upper light source set 3A and a lower light source set 3B).
Here, the direction in which light is emitted from the upper light source set 3A and the lower light source set 3B is the front side, and the direction orthogonal to the up-down direction and the front-back direction is the width direction or the left-right direction.
The upper light source set 3A and the lower light source set 3B are fixed on both sides in the width direction by a pair of connecting tools 5. The pair of connecting tools 5 are rotatably supported by a “U”-shaped arm 7 with the width direction as a rotation axis. Thereby, the directions of the light emitted from the upper light source set 3A and the lower light source set 3B can be adjusted.
As shown in FIG. 2, the lighting device 1 includes a terminal unit 9 connected to a power supply side cable (not shown) for supplying lighting power to the upper light source set 3A and the lower light source set 3B.
Hereinafter, each part will be described.

2. Each part (1) Light source set The upper light source set 3A and the lower light source set 3B have the same main configuration, and the fins of the heat sink have different shapes. Therefore, the main configuration of the light source set 3 will be described, and finally the heat sink will be described. In addition, when it is necessary to distinguish the light source sets, “A” or “B” may be added to the reference numerals and not shown in the drawings.

As shown in FIG. 4, the light source set 3 includes at least a light source unit 30. The light source set 3 here includes two light source units 30 in the width direction. In addition to the light source unit 30, the light source set 3 may include one or more of the housing 32, the reflector 34, and the cover 35. The light source set 3 of this embodiment has all of these. The two light source units 30 have the same configuration.

(1-1) Light Source Unit As shown in FIG. 5, the light source unit 30 includes a heat sink 301 and an LED module 302.
The heat sink 301 has a heat pipe 303 that extends in a cylindrical shape in the display direction and is filled with a working fluid, and a plurality of fins 304 provided on the outer peripheral surface of the heat pipe 303. The heat sink 301 integrally includes a heat pipe 303 and fins 304, and is made of, for example, an aluminum drawn product.
The heat pipe 303 has a cylindrical shape, and both ends thereof are closed by a front plate 305 and a back plate 306. The heat pipe 303 has a groove extending along the cylinder axis direction on the inner peripheral surface. The grooves have a depth of 0.2 to 0.5 mm and a circumferential pitch of 0.2 to 0.6 mm.

As shown in FIG. 7, the plurality of fins 304 extend radially from the heat pipe 303 and are provided at intervals in the circumferential direction of the heat pipe 303.
The LED module 302 includes one or a plurality of LEDs as a light source on a substrate, and the one or a plurality of LEDs is sealed with resin. The substrate has a rectangular shape, and the LEDs are mounted in a circular region centered on the center of the substrate. The LED module 302 is a COB type.
The LED module 302, while being mounted on the surface of the front plate 305 of the heat sink 301, is pressed and supported by the annular body 307 (see FIG. 6A) attached to the front plate 305. As shown in the enlarged view of FIG. 5, the annular body 307 has a step portion 307a on the back surface, and the rectangular substrate of the LED module 302 fits into the step portion 307a. The annular body 307 is attached to the heat sink 301 by inserting a screw (not shown) into the through hole of the annular body 307 and screwing the screw into the screw hole of the front plate 305.

It is desirable that the thickness of the front plate 305 of the heat sink 301 be a certain thickness or more (for example, 5 mm or more) from the viewpoint of heat dissipation. However, when the heat pipe 303 is joined by laser welding or the like, if the heat dissipation is too good, the temperature does not rise sufficiently by heating with the laser, so that a laser with a large output is required, which causes a restriction on the manufacturing facility. . Therefore, as the thickness of the front plate 305 of the heat sink 301, as shown in FIG. 5, the portion 305a to which the LED module 302 is attached is, for example, 5 mm, and the portion 305b joined to the heat pipe 303 is, for example, 2 mm. The thickness may be different depending on the portion.

(1-2) Housing Mainly described with reference to FIG.
The housing 32 has a box shape with a part of the surface opened (330). The housing 32 here has a rectangular parallelepiped shape that is long in the width direction. The housing 32 includes a peripheral wall member 332, a front wall member 324, and a back wall member 325. The peripheral wall member 332 includes an upper wall portion 320, a lower wall portion 321, and side wall portions 322 and 323, and has a shape in which a rectangular corner portion is chamfered in a cross section.
The housing 32 houses at least the heat sink 301. The housing 32A of the upper light source set 3A located on the upper side has a plurality of through holes 326 at least on the lower surface (lower wall portion 321). Here, both the upper and lower light source sets 3A and 3B have through holes 326 in the lower wall portion 321 of the housing 32.
The housing 32 has a plurality of through holes 326 on the surface (wall) facing the fins 304 of the heat sink 301. Thereby, the heat of the heat sink 301 can be released to the outside of the housing 32. The housing 32 may have a through hole 326 on the back surface (back wall member 325). Thereby, the heat dissipation characteristics can be further improved. The housing 32 of this embodiment has a plurality of through holes 326 in the other wall portions (320 to 323, 325) except the front wall member 324.
The through hole 326 has a rectangular shape that is long in the circumferential direction of the housing 32 in the upper wall portion 320, the lower wall portion 321, and the side wall portions 322 and 323, and a rectangular shape that is long in the width direction of the back wall member 325. ing.

The front wall member 324 and the peripheral wall member 332 have a connecting portion for connecting each other. That is, as shown in FIG. 6A, the screw 901 is inserted in a state in which the front brim portion 327 extending from the peripheral edge of the plate portion 329 of the front wall member 324 to the back side is fitted to the front end of the peripheral wall member 332. The through hole of the flange portion 327 is inserted and screwed into the screw holes of the upper wall portion 320, the lower wall portion 321, and the side wall portions 322 and 323.
The back wall member 325 and the peripheral wall member 332 have a connecting portion for connecting each other. That is, as shown in FIG. 6B, when the back flange 328 extending from the peripheral edge of the plate portion 331 of the back wall member 325 to the front side is fitted to the back side end of the peripheral wall member 332, the screw 902 is attached to the back side. The through hole of the collar portion 328 is inserted and screwed into the screw holes of the upper wall portion 320, the lower wall portion 321, and the side wall portions 322 and 323.

As shown in FIG. 4, the front wall member 324 has a through hole 330 in the plate portion 329, and in a state where the LED module 302 is exposed from the through hole 330, the light source unit 30 interposes the packing 36 on the front wall member 324. It is attached to the back side of.
As shown in FIG. 4, the packing 36 has an annular shape corresponding to the disk-shaped front plate 305 of the heat sink 301.
As shown in the enlarged view of FIG. 5, the packing 36 is bent from the outer peripheral edge to the back side along the peripheral edge of the front plate 305, and from the inner peripheral edge to the front side along the through hole 330 of the front wall member 324. .. That is, the packing 36 has a "Z" cross-sectional shape. This prevents moisture from entering the LED module 302 side from the heat sink 301 side.
The packing 36 has a convex portion 361 protruding to the back side on the surface of the heat sink 301 that contacts the front plate 305. The packing 36 has a convex portion 363 protruding to the front side on the surface of the housing 32 that abuts the front wall member 324.
The light source unit 30 is attached to the front wall member 324 by screwing the screw 903 shown in FIG. 5 from the front side into the through hole of the front wall member 324 and the packing 36 and then screwing it into the screw hole of the front plate 305 of the heat sink 301. It is done by doing.

(1-3) Reflector As shown in FIGS. 5 and 6, the reflector 34 has a cone shape with a front side spread, and the inner peripheral surface thereof is a reflecting surface. The cross-sectional shape of the reflector 34 is circular. The back side end of the reflector 34 is fitted into the opening of the annular body 307 of the light source unit 30, and the outer flange portion 341 at the front side end of the reflector 34 contacts the plate portion 351 of the cover 35. As a result, the reflector 34 is supported in the cover 35 while being positioned.

(1-4) Cover As shown in FIG. 4, the cover 35 has a box shape that is long in the width direction when viewed from the front side. The cover 35 has a plate portion 351 having an oval shape that is long in the width direction, a tubular portion 352 that extends from the peripheral edge of the plate portion 351 to the back side, and a bent portion 353 that bends outward from the back side end of the tubular portion 352. ..
The cover 35 is fixed to the front side of the housing 32 via packing 37 in a state of covering the two reflectors 34 in parallel.
The packing 37 has the same shape as the bent portion 353 of the cover 35. In the cover 35, the screw 904 is inserted into the through hole of the bent portion 353 and the through hole of the packing 37 and screwed into the screw hole of the front wall member 324 of the housing 32.

As shown in FIG. 4, the packing 37 has a rectangular annular portion 371 and an inner flange portion 373 that is bent from the inner peripheral edge of the rectangular annular portion 371 to the front side. As shown in the enlarged view of FIG. 5, the rectangular annular portion 371 is sandwiched between the bent portion 353 of the cover 35 and the front wall member 324 of the housing 32, and the outer peripheral surface of the inner flange portion 373 is the tubular portion of the cover 35. It fits on the inner peripheral surface of 352. This prevents moisture from entering the inside from between the cover 35 and the housing 32.
The packing 37 has a convex portion 375 that protrudes to the front side on the surface of the cover 35 that comes into contact with the bent portion 353. The packing 37 has a convex portion 377 projecting to the back side on the surface of the housing 32 that contacts the front wall member 324.

(2) Connecting tool This will be described with reference to FIG.
The connector 5 connects the upper and lower light source sets 3A and 3B. The connector 5 has a plate shape that is long in the vertical direction, and is connected to the arm 7 at the central portion in the vertical direction.
The connecting tool 5 includes a bulging portion 51 whose center in the vertical direction bulges outward in the width direction, an upper extending portion 53 which extends upward from the upper end of the bulging portion 51, and a lower end of the bulging portion 51. It has the lower extension part 55 extended below. The connecting tool 5 here has an upper bent portion 57 and a lower bent portion 59 that are bent inward in the width direction from the front ends of the upper stretched portion 53 and the lower stretched portion 55.

The arm 7 is attached to the bulging portion 51 with a screw 905.
As shown in FIG. 2, the upper extending portion 53 is bent toward the front flange portion 327 side of the front wall member 324 of the housing 32 of the upper light source set 3A and engages with the through hole of the front flange portion 327. It has a mating portion 531. The upper stretched portion 53 has a plurality of upper and lower screws 906 inserted through the through holes of the upper stretched portion 53 and the front flange portion 327 of the front wall member 324 and screwed into the screw holes of the side wall portions 322 and 323. It is fixed to the light source set 3A.
The lower extending portion 55 has a lower engaging portion 551 that is bent toward the front flange portion 327 side of the front wall member 324 of the housing 32 of the lower light source set 3B and engages with the through hole of the front flange portion 327. The lower stretched portion 55 has a plurality of upper and lower screws 906 inserted through the through holes of the lower stretched portion 55 and the front flange portion 327 of the front wall member 324 and screwed into the screw holes of the side wall portions 322 and 323. It is fixed to the light source set 3B.

Returning to FIG. 1, the upper bent portion 57 contacts the bent portion 353 of the cover 35 of the upper light source set 3A from the front side. As a result, the cover 35 can be prevented from falling from the housing 32. The upper bent portion 57 corresponds to an example of the locking portion of the present invention.
The lower bent portion 59 contacts the bent portion 353 of the cover 35 of the lower light source set 3B from the front side. As a result, the cover 35 can be prevented from falling from the housing 32. The lower bent portion 59 corresponds to an example of the locking portion of the present invention.

(3) Arm The arm 7 has a base portion 71 fixed to the installation surface as shown in FIG. 2, and a pair of standing portions 73 standing from both ends of the base portion 71 in the width direction. A tip portion of the standing portion 73 is attached to the connecting tool 5 with a screw 905.

(4) Terminal Unit As shown in FIG. 2, the terminal unit 9 is provided on the back side of the upper light source set 3A and the lower light source set 3B. The terminal unit 9 accommodates a terminal block 91 connected to a cable connected to a power supply unit (not shown) in a terminal case 93.
When the upper light source set 3A and the lower light source set 3B are viewed from the back side, the terminal unit 9 is arranged so as to straddle at least the upper light source unit 30A and the lower light source unit 30B as shown in FIG. The terminal unit 9 here is arranged so as to straddle a total of four light source units 30 in the vertical and width (left and right). As a result, the closed region that closes the through hole 326 of the back wall member 325 of the housing 32 of the upper light source set 3A and the lower light source set 3B can be made uniform, and a well-balanced heat dissipation efficiency can be secured.
As shown in FIG. 3, the terminal case 93 has a protrusion 95 protruding from the surface of the bottom wall to the front side. In the terminal unit 9, with the protrusion 95 inserted (interposed) between the upper light source set 3A and the lower light source set 3B, the projecting portion (not shown) of the terminal case 93 has the upper light source set 3A and the lower light source set. It is fixed to the back wall member 325 of both the housings 32 of 3B with screws.

3. The heat sink will be described with reference to FIG. 7. Note that FIG. 7 shows only the heat sink.
“A” is added to the reference numeral when describing the components that configure the upper light source set 3A, and “B” is added to the reference symbol when describing the components that configure the lower light source set 3B.
The upper light source unit 30A is located above the lower light source unit 30B. Therefore, the air heated by the heat sink 301B of the lower light source unit 30B rises, and the heat dissipation characteristic of the heat sink 301A of the upper light source unit 30A is deteriorated.
The heat sink 301A of the upper light source unit 30A here has a configuration that is less susceptible to the heat radiation of the lower heat sink 301B.
In the following specific description, the vertical axis X is a reference line that extends vertically through the central axis when viewed from the extending direction of the central axis of the heat pipe 303 (FIG. 7), and the horizontal axis. Y is a reference line extending in the width direction through the central axis when viewed from the same direction.

(1) Lower light source unit The fins of the lower light source unit 30B are the lower fins 304B, and 0° around the central axis of the heat pipe 303B based on the lowest point of the vertical axis X among the plurality of lower fins 304B. Fins in the region of 45° or more and less than 45° are defined as “lower 1/4 fins”, and fins in the region of 45° or more and less than 90° are defined as “lower 2/4 fins”, regions of 90° or more and less than 135° The fins in 1 are defined as “lower 3/4 fins”, and the fins in the region of 135° or more and less than 180° are defined as “lower 4/4 fins”.

The plurality of lower fins 304B are provided at intervals (here, at equal angles) in the circumferential direction of the heat pipe 303B. The lower fin 304B is provided in line symmetry with respect to the vertical axis X.
The lower fin 304B has a diameter extending portion 311B extending in the radial direction of the heat pipe 303B and an inclined extending portion 312B extending obliquely from the tip of the diameter extending portion 311B with respect to the extending direction of the diameter extending portion 311B. Have and. The radial extension portion 311B and the inclined extension portion 312B are linearly extended. Accordingly, the extension length of the lower fin 304B can be increased without increasing the outer diameter of the heat sink 301B.
When the lower fin 304B is viewed from the axial direction of the heat pipe 303B, the lower fin 304B has a bending point that bends in the direction away from the vertical axis (outward in the width direction) in the middle of the extending direction.

The plurality of inclined extending portions 312Ba of the lower ¼ fin 304Ba gradually extend laterally (away from the vertical axis X) as the lowest point of the vertical axis X moves in the circumferential direction. The inclined extending portion 312Bb of the lower 2/4 fin 304Bb extends horizontally (away from the vertical axis X). The plurality of inclined stretched portions 312Bc of the lower 3/4 fin 304Bc gradually stretches upward as the lowermost point of the vertical axis X moves away from the lowermost point in the circumferential direction (the uppermost point approaches the circumferential direction). The slanted extending portion 312Bd of the lower 4/4 fin 304Bd extends upward.

(2) Upper light source unit The fins of the upper light source unit 30A are the upper fins 304A, and among the plurality of upper fins 304A, 0° or more around the central axis of the heat pipe 303A with reference to the lowest point of the vertical axis X. The fins in the region of less than 90° are referred to as “upper 1/2 fins”, and the fins in the region of 90° or more and less than 180° are referred to as “upper 2/2 fins”.

The plurality of upper fins 304A are provided at intervals (here, at substantially equal angles) in the circumferential direction of the heat pipe 303A. The upper fin 304A is provided in line symmetry with respect to the vertical axis X.
The upper half fin 304Aa located below the horizontal axis Y extends so as to restrict the air heated by the lower light source unit 30B from touching the heat pipe 303A.
Specifically, the upper half fin 304Aa has at least a laterally extending portion 312Aa extending along the width direction (sideways) so as to be apart from the vertical axis X.
Since the lateral stretched portion 312A is stretched away from the vertical axis X, air heated in the lower light source units 30B is prevented from entering between adjacent 304A and heated in the lower light source units 30B. Regulate that air is trapped.
Here, the upper half fin 304Aa has a diameter extending portion 311Aa extending in the radial direction from the heat pipe 303A, and a horizontal extending portion 312Aa extending outward in the horizontal direction from the extension tip of the diameter extending portion 311Aa. The connection point between the radially extending portion 311Aa and the laterally extending portion 312Aa is the bending point.

The laterally extending portions 312Aa of the two upper half fins 304Aa which are adjacent to each other with the lowest point of the heat pipe 303A interposed therebetween are stretched to the opposite side (outward direction) to the side where the other upper half fin 304Aa is present. ing.
The laterally extending portion 312Aa of the upper half fin 304Aa is extended so that only the lowest portion of the heat pipe 303A is exposed when the upper heat sink 301A is viewed from below.
As a result, it is possible to reduce the amount of air heated by the lower light source unit 30B and touching the heat pipe 303A of the upper light source unit 30A. As a result, it is possible to suppress deterioration of the heat radiation characteristics of the heat pipe 303A of the upper light source unit 30A.

The laterally extending portion 312Aa of the upper half fin 304Aa extends laterally (side away from the vertical axis). The stretching tip of the lateral stretching portion 312Aa (on the side opposite to the radial stretching portion 311Aa) is located on the side opposite to the vertical axis with respect to the bending point of the other upper half fin 304Aa adjacent to the upper side. As a result, the air heated by the lower light source unit 30B rises along the upper half fins 304Aa of the upper light source unit 30A and is located below the upper fins 304Aa. The transversely extending portion 312Aa of 304Aa can prevent the heat pipe 303A from moving toward the heat pipe 303A.

The upper 2/2 fin 304Ab has a diameter extending portion 311Ab extending in the radial direction from the heat pipe 303A and an upper extending portion 312Ab extending upward from the extension tip of the diameter extending portion 311Ab. The connection point between the radially extending portion 311Ab and the upper extending portion 312Ab is the bending point.
The bending point of the upper 2/2 fin 304Ab is farther from the vertical axis than the upper extending portion 312Ab of the other upper 2/2 fin 304Ab adjacent to the upper side. As a result, the air heated by the heat pipe 303A can smoothly rise.

<Second Embodiment>
A heat sink 1301A according to the second embodiment will be described.
The heat sink 1301A is included in the upper light source unit located on the upper side.
The heat sink 1301A has a heat pipe 1303A and a plurality of fins 1304A. Among the plurality of fins 1304A, with reference to the lowest point (0°) of the vertical axis X, the fin at the lowest point around the central axis of the heat pipe 1303A is defined as "1/4 fin", and 0 The fins in the region of more than 90° and less than 90° are defined as “2/4 fins”, and the fins in the region of 90° or more and less than 180° are defined as “3/4 fins”, which are at the highest point (180°). The fin is “4/4 fin”.

The plurality of fins 1304A are provided at intervals (here, at substantially equal angles) in the circumferential direction of the heat pipe 1303A. The fins 1304A are provided line-symmetrically with respect to the vertical axis X.
The 1/4 fin 1304Aa extends so as to regulate the air heated by the lower light source unit 30B from touching the heat pipe 1303A. Specifically, the 1/4 fin 1304Aa has at least a pair of laterally extending portions 1312Aa extending along the width direction (sideways) away from the vertical axis X. The 2/4 fin 1304Ab has at least a lateral extension 1312Ab extending along the width direction (sideways) away from the longitudinal axis X.
Here, the 1/4 fin 1304Aa has a diameter extending portion 1311Aa extending in the radial direction from the heat pipe 1303A and a pair of horizontal extending portions 1312Aa extending in the horizontal direction from the extension tip of the diameter extending portion 1311Aa. Have. The 2/4 fin 1304Ab has a diameter extending portion 1311Ab extending from the heat pipe 1303A in the radial direction, and a horizontal extending portion 1312Ab extending in the horizontal direction from the extension tip of the diameter extending portion 1311Ab. The stretching direction of the lateral stretching portions 1312Aa and 1312Ab is a direction intersecting the lateral direction.
The connection point between the radially extending portion 1311Aa and the laterally extending portion 1312Aa is the bending point.

The extending tips of the laterally extending portions 1312Aa of the pair of 1/4 fins 1304Aa (opposite to the radial extending portions 1311Aa) are located on the opposite side of the vertical axis with respect to the bending point of the 2/4 fins 1304Ab adjacent to the upper side. This can prevent the air heated by the lower light source unit and rising from moving toward the heat pipe 1303A side along the upper surface of the laterally extending portion 1312Aa of the 1/4 fin 1304Aa.
The extension tip (the side opposite to the radial extension 1311Ab) of the lateral extension 1312Ab in the 2/4 fin 1304Ab is located on the opposite side to the vertical axis with respect to the bending point of the other upper 2/4 fin 1304Ab adjacent to the upper side. .. As a result, the air heated by the lower light source unit and rising along the 2/4 fins 1304Ab of the upper light source unit located below the air is laterally stretched by the 2/4 fins 1304Ab closest to the upper side. The portion 1312Ab can prevent the heat pipe 1303A from heading toward the heat pipe 1303A.
That is, it is possible to prevent air that has risen along the fins located below from entering the space between the adjacent fins and trapping the air that has risen.

Since the 1/4 fin 1304Aa and the 2/4 fin 1304Ab have the above-described configuration, the heat pipe 1303A is not exposed when the heat sink 1301A is viewed from below. As a result, it is possible to reduce the amount of air heated by the lower light source unit and contacting the air with the heat pipe 1303A of the upper light source unit. As a result, it is possible to suppress deterioration of the heat dissipation characteristics of the heat pipe 1303A of the upper light source unit.

The 3/4 fin 1304Ac has a diameter extending portion 1311Ac extending in the radial direction from the heat pipe 1303A, and an upper extending portion 1312Ac extending upward from the extension tip of the diameter extending portion 1311Ac. In addition, a connection point between the diameter extending portion 1311Ac and the upper extending portion 1312Ac is a bending point.
The bending point of the 3/4 fin 1304Ac is farther from the vertical axis than the upper extending portion 1312Ac of the other upper 3/4 fin 1304Ac adjacent to the upper side. Thereby, the air heated by the heat pipe 1303A can smoothly rise.
The 4/4 fin 1304Ad has a diameter extending portion 1311Ad extending in the radial direction from the heat pipe 1303A.

<Evaluation result>
FIG. 9 shows the result of measuring the temperature (chip temperature) of the LED of the LED module 302 using the upper fin 304A of the first embodiment and the fin 1304A of the second embodiment.
“When vertical” in the figure is a state in which the axis of the heat pipe of the heat sink is horizontal. The “elevation angle” is an angle between the axis of the heat pipe and the horizontal direction when the LED module side is inclined downward from the horizontal state. “Wind speed 0.3 m/s” is the case where wind is applied in the front-back direction to the lighting device.
The temperature of the LED is measured in a state where the lighting device in which the heat sink is incorporated is turned on, the lighting device is turned on under the rated condition, and the LED temperature is saturated. The configuration of the lighting device is the same except for the heat sink (fin shape).
It can be seen from FIG. 9 that when the heat sinks 301A and 1301A described in the embodiment are used, the temperature of the LED is lower than that of the heat sink that does not have the laterally extending portions 312A, 1312Aa and 1312Ab extending in the lateral direction.

<Modification>
1. Illumination Device The illumination device 1 according to the first embodiment has two light source sets 3A and 3B provided in the width direction, each including two light source units 30 vertically. However, as shown in FIG. 10A, the lighting device 2001 may include a plurality of (three here) light source units 2003 having a plurality (three here) of light source units 2030 in the width direction. ..
As shown in FIG. 10A, the upper light source unit is “2003A”, the middle light source unit is “2003B”, and the lower light source unit is “2003C”.
Also in this case, as shown in FIG. 10B, the fins 2304 of the heat sink 2301 of at least the first and second light source units 2003A and 2003B from the upper side have the laterally extending portions 2312.
That is, the present invention only needs to include light source units (heat sinks) that are vertically adjacent to each other, and may include one or three or more light source units in the width direction, or a plurality of light source units in the width direction. The light source set may be provided in a state where only one light source unit is adjacent to each other in the vertical direction, or may be provided in a state in which three (3 steps) or more light source units are adjacent to each other in the vertical direction, or in the width direction. The light source set including two or more light source units may be provided in three or more stages in the vertical direction.
The upper fin 304A of the first embodiment and/or the fin 1304A of the second embodiment are used for the upper light source unit 2003A and the middle light source unit 2003B.

2. Light Source Units The light source sets 3A and 3B of the embodiment have two light source units 30, and two light source units 30 are attached to the front wall member 324 of the housing 32. The light source unit may be configured by being connected in the width direction by the connecting tool while being housed in one housing, or two light source units may be housed in one housing and being connected vertically by the connecting tool. (In this case, the light source unit is also a light source set), or two light source units may be accommodated in one housing (in this case, the light source units may be provided in a plurality of rows in the width direction). ..
The light source unit 30 only needs to include the LED module 302 and the heat sink 301, and may not include the reflector, for example. Further, the cover 35 may be configured as a housing.
The cover 35 is provided so as to cover the two light source units 30, but may be provided so as to cover, for example, one light source unit.

3. Packing (1) Packing (36)
The packing 36 of the embodiment has a convex portion 363 projecting to the front wall member 324 side at a portion of the housing 32 that abuts the front wall member 324. Thereby, the sealing property between the surface wall member 324 and the packing 36 can be improved. Further, the front wall may have a groove at a portion facing the convex portion 363 of the packing 36. Thereby, the hermeticity can be further enhanced. In this case, the volume of the convex portion is preferably larger than the volume of the groove.
It is preferable that the convex portion 363 has an annular shape as a whole and the groove has an annular shape. Although the convex portion 363 is provided in a multiple ring shape here, it may be provided in a single layer. The above-mentioned hermeticity is due to the packing, and is not limited by the configurations of the light source module, the heat sink, and the like.
It is also conceivable that a heat radiation adhesive (silicone adhesive, silicone grease, etc.) is applied to the front surface of the front plate 305 and directly attached to the back surface of the front wall member 324 without providing the packing 36. It is also conceivable to apply a heat radiation adhesive to the front surface of the front plate 305 and attach it to the back surface of the LED module 302.
In this case, it is desirable that the silicone adhesive does not contain siloxane considering the influence on the circuit components and the like.

The packing 36 of the embodiment has a convex portion 361 projecting toward the front plate 305 side at a portion of the light source unit 30 that contacts the front plate 305. As a result, the airtightness between the front plate 305 and the packing 36 can be improved. Further, the front plate may have a groove at a portion facing the convex portion 361 of the packing 36. Thereby, the hermeticity can be further enhanced. In this case, the volume of the convex portion is preferably larger than the volume of the groove.
It is preferable that the convex portion 361 has an annular shape as a whole and the groove has an annular shape. Although the convex portion 361 is provided in a multiple ring shape here, it may be provided in a single layer. The above-mentioned hermeticity is due to the packing, and is not limited by the configurations of the light source module, the heat sink, and the like.

(2) Packing (37)
The packing 37 of the embodiment has a convex portion 375 projecting toward the bent portion 353 at a portion of the cover 35 that is in contact with the bent portion 353. Thereby, the airtightness between the bent portion 353 and the packing 37 can be improved. Further, the bent portion 353 may have a groove at a portion facing the convex portion 363 of the packing 37. Thereby, the hermeticity can be further enhanced. In this case, the volume of the convex portion is preferably larger than the volume of the groove.
It is preferable that the convex portion 375 has an annular shape as a whole and the groove also has an annular shape. Although the convex portion 375 is provided in a multiple ring shape here, it may be provided in a single layer. The above-mentioned hermeticity is due to the packing, and is not limited by the configurations of the light source module, the heat sink, and the like.

The packing 37 of the embodiment has a convex portion 377 projecting toward the front wall member 324 side at a portion of the housing 32 that abuts the front wall member 324. Thereby, the sealing property between the surface wall member 324 and the packing 37 can be improved. Further, the front wall may have a groove at a portion facing the convex portion 377 of the packing 37. Thereby, the hermeticity can be further enhanced. In this case, the volume of the convex portion is preferably larger than the volume of the groove.
It is preferable that the convex portion 377 has an annular shape as a whole and the groove has an annular shape. Although the convex portion 377 is provided in a multiple annular shape here, it may be provided in a single layer. The above-mentioned hermeticity is due to the packing, and is not limited by the configurations of the light source module, the heat sink, and the like.

4. Working Fluid Although it has been described that the working fluid is filled in the heat pipe 303, the working fluid may be pure water or R134a.
Since the heat pipe 303 is made of aluminum, when pure water is used as the working liquid, there is a concern that aluminum and pure water will undergo a corrosion reaction to generate hydrogen on the inner peripheral surface thereof.
Therefore, by forming a film (layer) of chromium hydroxide on the inner peripheral surface of the heat pipe 303, generation of hydrogen (corrosion) is suppressed as compared with the case where the film of chromium hydroxide is not formed. It is possible.

1 Lighting Device 3A, 3B Light Source Set 30 Light Source Unit 301 Heat Sink 302 LED Module 303 Heat Pipe 304 Fin

Claims (9)

In a lighting device having a light source unit having a light source provided on the surface of a heat sink at the top and bottom,
The heat sink includes a heat pipe that extends in the front-back direction in a tubular shape and is filled with a working fluid, and a plurality of fins provided on the outer peripheral surface of the heat pipe.
The plurality of fins in the upper light source unit are extended so as to restrict the air heated in the lower light source unit from touching the heat pipe. Among the plurality of fins in the upper light source unit, a lower fin located below the cylinder axis of the heat pipe is a laterally extending portion extending along a lateral direction orthogonal to the vertical direction and the front-back direction. The lighting device according to claim 1. The lower fin has a radial extension that extends radially from the heat sink,
The illuminating device according to claim 2, wherein the lateral stretching portion is stretched from a stretching tip of the diameter stretching portion. The heat pipe according to claim 1, wherein the heat pipe has a groove having a depth of 0.2 to 0.5 mm, extending in the cylinder axis direction, and having a circumferential pitch of 0.2 to 0.6 mm on the inner peripheral surface. The illumination device according to any one of claims. The light source unit includes a housing that houses the heat sink,
The lighting device according to claim 1, wherein the housing has a plurality of through holes on a lower surface facing the heat sink. The light source unit includes a housing that houses the heat sink,
The lighting device according to claim 1, wherein the housing has a plurality of through holes on a surface facing the heat sink. The housing has a box shape with a part of the surface opened,
The heat sink is fixed to the surface of the housing in a state where the light source is exposed from the opening,
In the light source unit, a cover that covers the light source from the front side is attached to the surface of the housing via packing.
The packing has a convex portion at a portion contacting the cover,
The lighting device according to claim 5, wherein the cover has a concave portion that fits with the convex portion, at a portion that comes into contact with the packing. A power supply unit that supplies lighting power to the upper and lower light source units is provided on the back surface of the housing,
The lighting device according to claim 7, wherein the power supply unit is disposed so as to straddle the upper and lower light source units when viewed from the back side in the extending direction of the tube axis of the heat pipe. A connecting tool that is fixed to the upper and lower light source units and connects the upper and lower light source units;
The lighting device according to claim 7 or 8, wherein the connector has a locking portion that locks the covers of the upper and lower light source units from the front side.

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