JP2012028267A - Light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device capable of enhancing cooling efficiency and obtaining high operation stability.SOLUTION: The light source device 100 is provided with an LED array 10, a heat sink 20, and a fan 30 in a case 2. The LED array 10 includes a plurality of LEDs 11 arranged in parallel along a right and left direction, and emits light frontward. The heat sink 20 includes a plurality of fins 21 which are made of a flat plate shape and are arranged in parallel so as to be laminated with a gap S along the right and left direction, and is thermally connected to the rear side of an ultraviolet light-emitting LED array 10. The fan 30 is installed on the rear side than the heat sink 20 in the case 2 and exhausts air in the case 2 to the outside. The upper side on the front side of the plurality of fins 21 is exposed outside from an opening 8 provided on the upper wall 2d of the case 2 with a gap S forming an air-introduction port 9, and on the upper side on the rear side of the plurality of fins 21, a covering part 7 to cover so as to close the gap S is provided.

Description

  The present invention relates to a light source device that emits light such as ultraviolet light.

  As a conventional light source device, for example, in Patent Document 1, a light emitting unit including a plurality of LEDs (light emitting elements) is placed on a heat sink, and the heat sink is placed on a frame. ), The LED is cooled through the heat sink and the frame by cooling the frame by blowing air. Further, for example, in Patent Document 2, a substrate on which a plurality of LEDs are mounted is mounted on a fin-shaped heat sink, and fans are mounted on both ends of the fin-shaped heat sink, and air is circulated in the heat sink by blowing air from the fan. Thus, it is described that the LED is cooled through the substrate and the heat sink.

JP 2009-289516 A JP 2007-101766 A

  Here, in the light source device as described above, while the demand for higher output and higher density is increasing, it becomes difficult to sufficiently cool the heat generating part such as the light emitting element, and the brightness and life of the light emitting element are reduced. There is a risk that the operational stability of the light source device may be impaired due to a decrease or the like. In particular, in the configuration described in Patent Document 2, since the fans are directly attached to both ends of the heat sink as described above, the air circulation efficiency (heat radiation efficiency) in the heat sink is uniform in the heat sink. It is difficult, and the heat dissipation capability of the light emitting element by the heat sink is not sufficiently exhibited, and sufficient cooling efficiency may not be obtained.

  Therefore, an object of the present invention is to provide a light source device that can improve cooling efficiency and obtain high operational stability.

  In order to solve the above problems, a light source device according to the present invention includes a plurality of light emitting elements arranged in parallel along at least a predetermined direction, a light emitting unit that emits light toward the front, a flat plate shape, and a predetermined direction Including a plurality of fins arranged in parallel so as to be stacked with a gap along the gap, and a heat-radiating part thermally connected to the rear side of the light-emitting part, a housing for housing the light-emitting part and the heat-dissipating part, Exhaust means that is provided on the rear side of the heat radiating portion in the body and exhausts the air in the housing to the outside, an opening provided in a wall portion on one side that intersects the front-rear direction and the predetermined direction in the housing, One side of the front side of the plurality of fins is exposed to the outside from the opening, and the gap constitutes an air introduction port for introducing air from the outside into the housing, and on the rear side of the plurality of fins On one side, the cover that covers the gap And it is provided.

  In the light source device of the present invention, one direction side of the front side of the plurality of fins is exposed to the outside from the opening to constitute an air introduction port, and external air is introduced into the housing from the air introduction port. The introduced air flows toward the rear side in the gap while being guided by the fins, and is discharged to the outside. At this time, since the covering portion provided on one side on the rear side of the plurality of fins acts to narrow and narrow the air inlet, in the air flowing through the housing, the flow velocity is increased, The fins are also actively guided to the other side opposite to the one side, so that the entire fin is efficiently contacted. Therefore, according to the present invention, it is possible to improve the heat radiation efficiency of the heat radiating section, increase the cooling efficiency of the light source device, and obtain high operational stability.

  Moreover, it is preferable that the length along the predetermined direction of a light emitting element is more than the sum of the plate | board thickness of a fin, and a clearance gap. In this case, a plurality of fins are densely arranged in parallel so that one or more fins correspond to one light emitting element. By closely arranging fins in this way, the heat capacity of the heat radiating section can be suitably increased, and the flow velocity of air passing through the gap can be further increased, and the heat radiating efficiency of the heat radiating section can be improved to improve the cooling efficiency of the light source device. It is possible to increase and obtain high operational stability.

  Moreover, it is preferable that the exhaust means is attached to the rear wall portion of the housing. In this case, since air is discharged from the rear side of the housing, the flow of the air becomes smooth, the heat dissipation efficiency is improved, the cooling efficiency of the light source device is increased, and high operational stability can be obtained.

  Moreover, it is preferable that the exhaust means is attached to a wall portion on one side of the housing. In this case, since the exhaust means is provided on the wall on one side so that air is discharged from one side where heat tends to accumulate and the temperature is likely to rise, heat is easily released to the outside. Therefore, it is possible to improve the heat radiation efficiency, increase the cooling efficiency of the light source device, and obtain high operational stability.

  Moreover, it is preferable that the exhaust means is attached to the wall part of the other direction side opposite to one direction in a housing | casing. In this case, since air is discharged from the other side of the housing, it is possible to suppress the influence of the air exhausted by the exhaust means on the air inlet on one side. Therefore, it is possible to improve the heat radiation efficiency, increase the cooling efficiency of the light source device, and obtain high operational stability.

  In addition, the housing further includes a drive unit for driving the light emitting element, and the drive unit is disposed on the wall on the rear side of the heat radiating unit and in the other direction opposite to the one direction in the housing. It is preferable. Here, the air introduced from the air introduction port into the housing passes through the gap between the fins using the fins as a guide, and reaches the back of the housing, that is, the wall on the other side of the housing. Therefore, by disposing the drive unit on the other wall, it is possible to sufficiently dissipate the heat of the drive unit that is likely to become high temperature (which is likely to become a heat source in the light source device), and cooling the light source device. Efficiency can be increased and high operational stability can be obtained.

  Moreover, it is preferable that the plate | board thickness of a fin is smaller than the clearance gap between fins. In this case, air can be easily circulated through the gaps between the plurality of fins, the heat dissipation efficiency can be improved, the cooling efficiency of the light source device can be increased, and high operational stability can be obtained.

  Moreover, it is preferable that the length along one direction of a fin is longer than the length along the front-back direction of a fin. As a result, compared to the case where the length along one direction of the fin is shorter than the length along the front-rear direction, the thermal coupling region between the light emitting portion and the fin can be easily increased, and thus the heat dissipation efficiency is improved. Thus, it is possible to increase the cooling efficiency of the light source device and obtain high operational stability.

  In addition, as a configuration that favorably exhibits the above-described effects, specifically, a configuration in which the covering portion is configured by a wall portion on one side of the housing can be given.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the cooling efficiency of a light source device and to obtain high operation stability.

It is a perspective view which shows the light source device which concerns on 1st Embodiment of this invention from the front side. It is a top view of the light source device of FIG. It is a bottom view of the light source device of FIG. It is a front view of the light source device of FIG. It is a rear view of the light source device of FIG. It is sectional drawing along the VI-VI line of FIG. It is a perspective view which shows the state which removed the front wall of the light source device of FIG. It is a perspective view which shows the ultraviolet light emission LED array and heat sink of the light source device of FIG. It is a perspective view which shows the LED unit of the light source device of FIG. 1 from the downward side. It is a perspective view which shows LED of the light source device of FIG. 1 from a rear side. It is a top view which shows the heat sink of the light source device of FIG. It is a side view which shows the fin of the light source device of FIG. It is a rear view which shows the rod lens of the light source device of FIG. It is a figure which expands and shows a part of FIG. It is a schematic sectional drawing corresponding to FIG. 6 for demonstrating the flow of the air in the light source device of FIG. It is a perspective view which shows the light source device which concerns on 2nd Embodiment of this invention from the front side. It is a schematic sectional drawing corresponding to FIG. 6 for demonstrating the flow of the air in the light source device of FIG. It is a perspective view which shows the light source device which concerns on 3rd Embodiment of this invention from the front side. It is a schematic sectional drawing corresponding to FIG. 6 for demonstrating the flow of the air in the light source device of FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted. The terms “front”, “rear”, “upper”, “lower”, “left”, and “right” are based on the state of the light source device and are convenient.

  First, a first embodiment of the present invention will be described. 1 to 5 are respective views showing the light source device according to the first embodiment of the present invention, FIG. 6 is a sectional view taken along line VI-VI in FIG. 2, and FIG. 7 is a front wall of the light source device in FIG. FIG. 8 is a perspective view showing an ultraviolet light emitting LED array and a heat sink of the light source device of FIG.

  As shown in FIGS. 1-6, the light source device 100 of this embodiment irradiates light, such as an ultraviolet light, and performs resin hardening, ink drying, etc., for example. The light source device 100 includes an ultraviolet light emitting LED array (light emitting unit) 10, a heat sink (heat radiating unit) 20, a fan (exhaust means) 30, and a rod lens 40, and these are housed in the housing 2. .

  The housing 2 constitutes the outer periphery of the light source device 100. The casing 2 has a rectangular parallelepiped shape whose outer shape is long in the left-right direction (predetermined direction). For example, the length in the left-right direction is 300 mm, the length in the front-rear direction is 120 mm, and the length in the up-down direction. Is 60 mm. The housing 2 includes a rectangular flat plate-like front wall 2a, rear wall (rear wall portion) 2b, side walls 2c and 2c, an upper wall 2d, and a lower wall 2e.

  The front wall 2a is formed with an emission window 3 having an elongated rectangular shape in the left-right direction when viewed from the front, as an opening for emitting light. Flange 41x and 41y (refer FIG. 6) are provided in the inner surface of this front wall 2a on the upper side and the lower side of the emission window 3 so as to extend in the left-right direction. On the other hand, an air outlet 4 is formed in the rear wall 2b. The air outlet 4 is an opening for leading the air in the housing 2 to the outside.

  The upper wall 2d is a wall portion on the upper side (one direction) orthogonal to (crossing) the left-right direction and the front-rear direction, and controls the operation of the light source device 100 on the rear side of the inner surface (back surface) of the upper wall 2d. A control board 6 is fixed. On the other hand, the lower wall 2e is a wall portion on the lower side (other direction) side, and on the inner surface (back surface) of the lower wall 2e, the power supply substrate 5 for supplying power to the ultraviolet light emitting LED array 10 extends forward. It is fixed to.

  As shown in FIG. 7, the ultraviolet light emitting LED array 10 emits light toward the front, and has a plurality of LEDs (Light Emitting Diodes) 11 arranged in parallel in at least the left-right direction. . That is, in the ultraviolet light emitting LED array 10, a plurality of LEDs 11 are arranged so as to have a row extending in the left-right direction. The ultraviolet light emitting LED array 10 is configured by arranging LED units 15 each having a plurality of LEDs 11 as a unit so as to be close to each other in the left-right direction. In addition, the ultraviolet light emitting LED array 10 here is composed of 45 LEDs 10 (total 90) arranged side by side in two upper and lower rows, and is elongated in the left-right direction.

  FIG. 9 is a perspective view showing the LED unit from the lower side, and FIG. 10 is a perspective view showing the LED from the rear side. As shown in FIG. 9, the LED unit 15 includes a substrate 12, a plurality of LEDs 11 arranged in parallel on the front surface 12a side of the substrate 12, and a heat transfer plate 13 fixed on the rear surface 12b side of the substrate 12. ing. The LED 11 is an ultraviolet light-emitting chip type light-emitting element in which a semiconductor crystal 14x is housed in a casing having a rectangular parallelepiped outer shape and sealed with a glass plate 14y, and emits high-power ultraviolet light. The LED 11 has a square shape when viewed from the front surface 12a from which ultraviolet light is emitted, and has a width of, for example, 7 mm long × 7 mm wide. The LEDs 11 are arranged and fixed in 2 rows and 4 columns on the front surface 12 a of the substrate 12 so that the side surfaces thereof are close to each other.

  As shown in FIG. 10, a cathode terminal 16a and an anode terminal 16b extending in parallel are provided at both ends of the rear surface 11b of the LED 11. On the rear surface 11b, a metal heat radiation surface 17 having a rectangular shape is provided between the cathode terminal 16a and the anode terminal 16b to dissipate the LED 11.

  Returning to FIG. 9, one heat transfer plate 13 is provided for each substrate 12, and functions as a heat transfer member that collectively transfers the heat of the plurality of LEDs 11 in the LED unit 15 to the heat sink 20. The heat transfer plate 13 is formed of a metal material having high thermal conductivity such as copper. The heat transfer plate 13 enters the through hole 12x of the substrate 12 and comes into contact with the heat dissipation surface 17 of the LED 11, and is brazed to the heat dissipation surface 17 and fixed. Thereby, LED11, the board | substrate 12, and the heat exchanger plate 13 are integrated, and the thermal radiation surface 17 (refer FIG. 6) of the rear surface 11b of LED11 is thermally connected to the heat exchanger plate 13. FIG.

  In addition, a power supply wiring portion 18 is provided below the substrate 12. The power supply wiring portion 18 is a collection of electrical wiring patterns (not shown) that are electrically connected to the LEDs 11, and unifies the power supply portions for the LEDs 11. As shown in FIG. 6, the power supply wiring portion 18 is electrically connected to the power supply substrate 5.

  As shown in FIGS. 6 and 8, the heat sink 20 radiates the heat of the LED 11, and has a long shape in the left-right direction so as to correspond to the ultraviolet light emitting LED array 10. The heat sink 20 is disposed behind the ultraviolet light emitting LED array 10 in the housing 2 and is fixed to the ultraviolet light emitting LED array 10 so as to be thermally connected to the ultraviolet light emitting LED array 10. The heat sink 20 is fixed to the upper wall 2d while being in contact with the inner surface of the upper wall 2d (details will be described later).

  FIG. 11 is a plan view showing the heat sink, and FIG. 12 is a side view showing the fins. As shown in FIGS. 11 and 12, the heat sink 20 includes a plurality of fins 21 having a rectangular flat plate shape, and connection portions 22 that fix the fins 21 and are thermally connected to the ultraviolet light emitting LED array 10. It is configured to include. The fins 21 are arranged in parallel so as to be stacked in the left-right direction with a gap S therebetween. In other words, the fins 21 are arranged in the left-right direction so as to stand up and down, whereby a gap S that is a plate-like space region is defined between the fins 21. That is, the plurality of fins 21 are arranged in a domino shape adjacent to each other at equal intervals in the left-right direction.

  The fins 21 here are made of, for example, aluminum or copper, with a plate thickness L1 of 0.8 mm, a front-rear length L2 of 40 mm, a vertical length L3 of 45 mm, a pitch Lp of 1.8 mm, and a gap S of 1 mm. It is configured. That is, in this embodiment, the length in the left-right direction of the LED 11 is made larger than the pitch Lp of the plurality of fins 21, the plate thickness L1 of the fins 21 is made smaller than the gap S between the fins 21, 21, The vertical length L3 is longer than the longitudinal length L2. The front-rear length L2 is a length along the front-rear direction of the fin 21, and the vertical length L3 is a length along the vertical direction of the fin 21. The pitch Lp is an arrangement interval between the adjacent fins 21 and 21 and is the total of the plate thickness L1 of one fin 21 and one gap S.

  The fins 21 are fixed so as to be inserted into the connecting portions 22, whereby the connecting portions 22 are thermally connected to the fins 21. Moreover, as shown in FIG. 6, the connection part 22 is contact | abutted to the heat-transfer board 13 of the LED unit 15 via resin (grease) with high heat conductivity. Further, the connection portion 22 is screwed to the LED unit 15 with a screw inserted into a through hole H (see FIG. 9) of the LED unit 15, whereby the heat sink 20 and the LED unit 15 are joined to each other. As described above, in the heat sink 20, the fins 21 are thermally connected to the LEDs 11, and the heat generated in the LEDs 11 is propagated (heat transfer) to the fins 21.

  As shown in FIGS. 2 and 6, the fan 30 is a blower mechanism that blows and discharges the air in the housing 2 to the outside (outside the housing 2), and cools by replacing the atmosphere in the housing 2. Is. The fan 30 is provided behind the heat sink 20 in the housing 2. Specifically, a plurality of fans 30 are provided on the rear wall 2 b so as to be arranged in parallel in the left-right direction in the housing 2. According to the fan 30, the air in the housing 2 is pumped to the outside through the air outlet 4 of the rear wall 2b and exhausted.

  13 is a rear view showing the rod lens, and FIG. 14 is an enlarged view of a part of FIG. As shown in FIGS. 6, 13, and 14, the rod lens 40 is a light transmitting member having a rectangular parallelepiped shape elongated in the left-right direction, and is formed of quartz. The rod lens 40 has a function as a lens or a mixing member. The rod lens 40 repeatedly and totally reflects the light emitted from the LED 11 to make the light quantity uniform while increasing the peak light quantity of the light. The outer surface of the rod lens 40 is mirror-polished.

  The rod lens 40 is mounted on the inner surface (back surface) side of the front wall 2 a of the housing 2. Specifically, the O-ring 42 is fixed to the outer periphery of the rod lens 40, and in this state, the rod lens 40 is attached to the front wall 2a so as to be sandwiched between the flanges 41x and 41y of the front wall 2a. That is, the rod lens 40 is attached so as to sandwich the O-ring 42 between the flanges 41x and 41y of the front wall 2a, and is held by the flanges 41x and 41y and fixed to the front wall 2a. Thereby, as shown in FIG. 6, the rod lens 40 is fixed to the emission window 3 while being in contact with the LED 11 so as to face the front side of the LED 11. As a result, the LED 11 faces the outside from the exit window 3 through the rod lens 40.

  Further, in the present embodiment, a driving unit 50 for driving the LED 11 is provided in the housing 2. The drive unit 50 is disposed on the rear side of the lower wall 2 e so as to be located on the rear side of the heat sink 20, and includes a drive unit heat sink 51 and a power transistor 52.

  The heat sink 51 for drive part is formed, for example with aluminum, and is long in the left-right direction, and is exhibiting the U-shape which opens back in the left-right direction view. The drive unit heat sink 51 is fixed to the lower wall 2e. The power transistor 52 constitutes an electric circuit element that drives the LED 11. A plurality of power transistors 52 are arranged and fixed on the upper surface of the drive unit heat sink 51 so as to be arranged in parallel in the left-right direction, and are thermally connected to the drive unit heat sink 51.

  Here, in the light source device 100 of the present embodiment, the opening 8 is formed in the upper wall 2d of the housing 2. The opening 8 has a rectangular shape that is long in the left-right direction when viewed in the up-down direction, and communicates with the inside and outside of the upper wall 2d. The opening 8 is exposed on the front side of the plurality of fins 21 so that the upper surface 21a faces the outside. Accordingly, the upper side of the front side of the plurality of fins 21 constitutes an air introduction port 9 for introducing air from the outside into the housing 2 by the gap S between the fins 21. In other words, the upper side of the predetermined portion including the front ends of the plurality of fins 21 is exposed to the outside of the housing 2 through the opening 8, and the opening 8 is closed so that the gap S becomes the air inlet 9. Has been placed.

  On the other hand, the upper side of the rear side of the plurality of fins 21 is covered with the upper wall 2d of the housing 2 so that the upper side of the gap S is closed. Specifically, on the rear side of the plurality of fins 21, the upper wall 2 d is brought into contact with the upper end surface constituting the upper surface 21 a so as to cover the cover portion 7, thereby the upper side of the gap S. The end portion is sealed so as not to be an air introduction portion for introducing air from the outside to the inside of the housing 2 (so as not to constitute the air introduction port 9). In other words, the plurality of fins 21 have a region covered by the housing 2 at the upper rear side.

  That is, the plurality of fins 21 are opposed to the opening 8 so as to be closed, and the upper surface 21a side is exposed to the outside of the housing 2 through the opening 8, so that the clearance S between the exposed portions is formed. While extending to the rear side (fan 30 arrangement side) with respect to the area defined as the air introduction port 9 and the opening 8, the housing 2 comes into contact with the upper end thereof, whereby the clearance S between the contact portions is increased. Are covered so as not to be an air introduction part for introducing air from the outside to the inside of the housing 2 (so as not to constitute the air introduction port 9).

  Here, a portion of the plurality of fins 21 on the rear side of 25 mm from the front end of the upper surface 21 a (about 60% of the front-rear length L <b> 2) is exposed from the opening 8 to constitute the air inlet 9. That is, 15 mm (about 40% of the front-rear length L2) front side of the plurality of fins 21 from the rear end of the upper surface 21a is covered by the upper wall 2d as the covering portion 7 and the upper side of the gap S is closed. .

  In the light source device 100 configured as described above, as shown in FIG. 15, external air (also referred to as cooling air or cooling air) A passes through the opening 8 in the upper wall 2 d of the housing 2. Then, the air is introduced from the air inlet 9, that is, the gap S at the upper front end side of the plurality of fins 21. The air A is circulated toward the rear side in the gap S while the flow is guided by the fins 21.

  At this time, in the upper wall 2d that covers the rear upper portions of the plurality of fins 21, the air introduction port 9 is narrowed and squeezed. Therefore, the air A flowing through the gap S has an increased flow velocity and directivity, and is actively guided to the lower side of the fins 21. As a result, the air A efficiently contacts the entire fin 21 and the entire fin 21 is sufficiently cooled. Therefore, according to the present embodiment, the heat dissipation efficiency of the heat sink 20 can be improved, and the heat generated in the LED 11 can be sufficiently dissipated and diffused by the fins 21 to be cooled. As a result, it is possible to suppress a decrease in luminous efficiency and luminance of the LED 11, improve the operational stability of the LED 11, and thus the light source device 100, and realize a longer life of the LED 11 and thus the light source device 100.

  Here, the air A guided to the lower side of the fin 21 is improved in flow velocity and directivity as described above and is distributed using the fin 21 as a guide. To the rear side of the housing 2), flows toward the rear (fan 30 side) while being in sufficient contact with the power transistor 52 and the drive unit heat sink 51, and is exhausted to the outside through the air outlet 4. The Therefore, the heat of the drive unit 50 disposed on the lower wall 2e and serving as a high heat generation heat source of the light source device 100 can be sufficiently radiated and diffused to be cooled.

  Moreover, in this embodiment, since the fan 30 is attached to the rear wall 2b of the housing | casing 2 as mentioned above, since the air A is discharged | emitted from the rear side, the flow of the air A in the housing | casing 2 Thus, the heat radiation efficiency in the light source device 100 can be improved.

  Further, as described above, the length along the left-right direction of the LED 11 in the present embodiment is equal to or greater than the pitch Lp (the sum of the plate thickness L1 and the gap S) of the plurality of fins 21, and in particular, the present embodiment. Then, it is larger than the pitch Lp. Therefore, the fins 21 are closely arranged in parallel so that at least one fin corresponds to one LED 11 (particularly, in the present embodiment, two or more fins 21 correspond). By closely arranging the fins 21 in this manner, the heat capacity of the heat sink 20 can be suitably increased, the flow rate of the air A passing through the gap S can be further increased, and the heat dissipation efficiency of the heat sink 20 can be further improved. It becomes.

  Moreover, in this embodiment, since the plate | board thickness L1 of the fin 21 is made smaller than the clearance gap S as mentioned above, the air A can be easily distribute | circulated to the clearance gap S. FIG. Further, since the vertical length L3 of the fin 21 is longer than the longitudinal length L2 of the fin 21, the thermal coupling region between the LED 11 and the fin 21 compared to the case where the vertical length L3 of the fin 21 is shorter than the longitudinal length L2. Can be easily increased, and the heat of the LED 11 can be easily and sufficiently dissipated.

  Further, in the present embodiment, as described above, in the case 2 that is long in the left-right direction, the opening 8 that is long in the left-right direction is provided in the upper wall 2d. It can be introduced into the body 2. Furthermore, since the fins 21 extend along the flow direction (parallel to be stacked in the left-right direction), variation in the flow of air A can be suppressed in the left-right direction, and the plurality of fins 21 Thus, it is possible to suppress the temperature variation of the heat sink 20 and thus the heat dissipation efficiency variation of the heat sink 20.

  In the present embodiment, the ultraviolet light emitting LED array 10, the heat sink 20, and the drive unit 50 are configured in a long shape with the left-right direction as a longitudinal direction, and one unit ( It can be said that it is a unit. Thereby, the following effects are exhibited. That is, when the area of the light source device 100 is increased, it can be dealt with by increasing the number of units, and design and manufacture can be facilitated. Moreover, it can suppress that a difference (variation) arises in heat dissipation efficiency in the left-right direction.

  In the present embodiment, as described above, the power transistor 52 is not directly fixed to the lower wall 2e, but is fixed to be separated from the lower wall 2e via the heat sink 51 for driving unit. Therefore, it is possible to easily distribute the air A so as to come into contact with the power transistor 52 in the housing 2. Furthermore, since the heat sink 51 for a drive unit has a U-shaped cross section, the heat dissipation area can be increased and the heat dissipation efficiency can be improved. At this time, since the U-shaped opening side of the heat sink 51 for the drive unit is the rear side (fan 30 side) and the side with the larger heat dissipation area is opposed to the fan 30, the heat dissipation efficiency is further improved. It becomes possible to make it.

  In the present embodiment, the upper surface 21a of the fin 21 exposed from the opening 8 is recessed inward by the thickness of the upper wall 2d with respect to the upper wall 2d. It is possible to suppress external contact and maintain an appropriate distance between the fins 21, and as a result, it is possible to suppress the occurrence of a bias in heat dissipation efficiency due to the change in the gap S.

  As described above, as a result of performing a test for confirming heat dissipation on the light source device 100 of the present embodiment, the temperature of the LED 11 that is a typical heat source is not provided with the covering portion 7 (that is, the plurality of fins 21 as a whole are externally exposed. In the case of the air inlet 9 being exposed, the temperature was about 50 ° C., whereas in this embodiment, it was about 45 ° C. Further, the temperature of the power transistor 52, which is another typical heat source, is about 70 ° C. when the covering portion 7 is not provided, but is about 65 ° C. in the present embodiment. It was. Thereby, it was possible to confirm the above-mentioned effect of sufficiently radiating and cooling the heat generated in the LED 11 and the power transistor 52 which are main heat sources in the light source device 100.

  Incidentally, when the gap S is covered so as to be closed to the same extent only at the front upper portions of the plurality of fins 21, the cooling efficiency has been reduced, contrary to the present embodiment. Accordingly, it is determined that it is necessary to cover at least the gaps S at the upper rear side of the plurality of fins 21 in order to improve the cooling efficiency.

  Next, a second embodiment of the present invention will be described. In the description of the present embodiment, differences from the first embodiment will be mainly described.

  16 is a perspective view showing a light source device according to a second embodiment of the present invention from the front side, and FIG. 17 is a schematic cross-sectional view corresponding to FIG. 6 for explaining the air flow in the light source device of FIG. As shown in FIGS. 6 and 16, the light source device 200 of the present embodiment is different from the light source device 100 in that the upper wall 2d of the housing 2 is replaced with the fan 30 attached to the rear wall 2b of the housing 2. The air outlet 4 is formed in the upper wall 2d.

  As shown in FIG. 17, in the present embodiment, the air A guided to the lower side of the fin 21 reaches the lower wall 2 e and then moves upward (fan 230) while sufficiently contacting the drive unit 50. Side) and then exhausted from the air outlet 4 to the outside.

  As described above, the present embodiment also has the same effect as the above-described effects, that is, the effect that the heat of the LED 11 and the heat of the driving unit 50 can be sufficiently radiated and cooled. Further, in the present embodiment, since the fan 230 is attached to the upper wall 2d so that the air A is discharged from the upper side of the housing 2 where heat is easily accumulated and the temperature is likely to rise, heat is easily released to the outside. Thus, the heat dissipation efficiency of the light source device 200 can be improved.

  Next, a third embodiment of the present invention will be described. In the description of the present embodiment, differences from the first embodiment will be mainly described.

  18 is a perspective view showing a light source device according to a third embodiment of the present invention from the front side, and FIG. 19 is a schematic cross-sectional view corresponding to FIG. 6 for explaining the air flow in the light source device of FIG. As shown in FIGS. 6 and 18, the light source device 300 of the present embodiment is different from the light source device 100 in that the lower wall 2 e of the housing 2 is replaced with the fan 30 attached to the rear wall 2 b of the housing 2. And the air outlet 4 is formed in the lower wall 2e.

  As shown in FIG. 19, in the present embodiment, in the air A guided to the lower side of the fin 21, the air reaches the lower wall 2 e, and is below (fan 230) while sufficiently contacting the drive unit 50. Side) and then exhausted from the air outlet 4 to the outside.

  As described above, the present embodiment also has the same effect as the above-described effects, that is, the effect that the heat of the LED 11 and the heat of the driving unit 50 can be sufficiently radiated and cooled. Further, in the present embodiment, since the fan 330 is attached to the lower wall 2e of the housing 2, the air A is discharged from the lower side of the housing 2, so that the air inlet on the upper side of the housing 2 It is possible to suppress the adverse effect of the exhausted air on 9 and to improve the heat dissipation efficiency of the light source device 300.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. The present invention is modified without departing from the gist described in each claim or applied to other embodiments. It may be a thing.

  For example, in the above-described embodiment, the LEDs 11 are arranged in the upper and lower rows in the ultraviolet light emitting LED array 10, but may be arranged in the upper and lower rows, or may be arranged in three or more rows. LED11 should just be parallel along at least the left-right direction (predetermined direction).

  Further, the length in the front-rear direction of the covering portion 7 and the length in the front-rear direction of the plurality of fins 21 exposed from the opening 8 are not limited to the above embodiment. For example, as a preferable range for achieving the above-described effects, the gap S is closed by covering a portion of the plurality of fins 21 that is 40% to 60% of the longitudinal length L2 from the rear end with the upper wall 2d. May be.

  Further, the shape of the fin 21 is not limited to the above embodiment. For example, the plate thickness L1 is set to 0.3 mm to 2 mm, and the pitch Lp is set to 1 mm to be preferable for achieving the above-described effects. It may be 5 mm.

  Moreover, in the said embodiment, although the upper side is covered with the coating | coated part 7 comprised by the upper wall 2d of the housing | casing 2 in the back side of the several fin 21, the housing | casing 2 which can suppress inflow of air. It may be covered with a covering portion 7 of a different member (for example, a plate-like member or a tape material separate from the housing 2).

  2 ... Case, 2b ... Rear wall (rear wall), 2d ... Upper wall (wall in one direction), 2e ... Lower wall (wall in other direction), 7 ... Cover, 8 ... Opening portion, 9 ... air inlet, 10 ... ultraviolet light emitting LED array (light emitting portion), 11 ... LED (light emitting element), 20 ... heat sink (heat radiating portion), 21 ... fin, 30, 230, 330 ... fan (exhaust means) ), 50... Drive unit, 100, 200, 300... Light source device, L1... Plate thickness of fin, L2 .. front and rear length of fin (length along longitudinal direction), L3. ) Along the length), S ... gap.

Claims (9)

A light emitting unit including at least a plurality of light emitting elements arranged in parallel along a predetermined direction, and emitting light toward the front;
A plurality of fins arranged in parallel so as to have a flat plate shape and a gap along the predetermined direction, and a heat dissipating part thermally connected to the rear side of the light emitting part;
A housing for housing the light emitting unit and the heat radiating unit;
An exhaust means provided behind the heat dissipating part in the housing, for exhausting air in the housing to the outside;
An opening provided in a wall portion on one side crossing the front-rear direction and the predetermined direction in the housing,
The one-direction side on the front side of the plurality of fins is exposed to the outside from the opening, and the gap constitutes an air introduction port for introducing air from the outside into the housing,
The light source device according to claim 1, wherein a covering portion that covers the gap is provided on the one-direction side behind the plurality of fins.   The light source device according to claim 1, wherein a length of the light emitting element along the predetermined direction is equal to or greater than a sum of a plate thickness of the fin and the gap.   The light source device according to claim 2, wherein the exhaust unit is attached to a rear wall portion of the housing.   The light source device according to claim 2, wherein the exhaust unit is attached to a wall portion on the one-direction side of the housing.   The light source device according to claim 2, wherein the exhaust unit is attached to a wall portion in the other direction opposite to the one direction in the casing. A drive unit for driving the light emitting element is further provided in the housing.
The said drive part is arrange | positioned in the wall part of the other direction side opposite to the said one direction in the said housing | casing behind the said thermal radiation part, The any one of Claims 1-5 characterized by the above-mentioned. The light source device according to item.   The light source device according to claim 1, wherein a plate thickness of the fin is smaller than the gap between the fins.   The light source device according to claim 1, wherein a length of the fin along the one direction is longer than a length of the fin along a front-rear direction.   The light source device according to claim 1, wherein the covering portion is configured by a wall portion on the one-direction side in the housing.

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