JP2013125900A - Light radiation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light radiation apparatus which efficiently cools the interior of the apparatus.SOLUTION: A light radiation apparatus 1 includes: a substrate 6; multiple light emitting diodes 30 mounted along a first direction on a first surface of the substrate 6; multiple heat radiation members 32 disposed in a second direction perpendicular to the first direction on a second surface of the substrate 6 so as to be spaced predetermined distance away from each other, the multiple heat radiation members 32 forming multiple passages extending in the first direction at spaces between the adjacent heat radiation members 32; and an air suction unit 31 suctioning air thereby generating airflow in the passages along the first direction. One end part of each heat radiation member 32 is disposed on the second surface, and the multiple passages include small passages 33 and large passages 35, each of which has a space larger than a space of each small passage.

Description

  The present invention relates to a light irradiation apparatus using a light emitting diode (LED).

  Conventionally, various methods have been proposed to cool a light emitting diode (LED). For example, a cooling structure as shown in FIG. 12 has been proposed. In the example shown in FIG. 12, the LED 100 is disposed on one surface of the substrate 101, and a plurality of heat dissipation members 102 are disposed on the other surface of the substrate. Each heat radiating member 102 is formed in a thin plate shape, and is arranged at intervals. With this configuration, heat of the LED 100 is transmitted to the heat radiating member 102 through the substrate 101, and the heat radiating member 102 is cooled by ambient air, whereby the LED 100 is cooled.

JP 2008-28377 A

  By the way, in the LED cooling structure as described above, various methods have been proposed to increase the cooling capacity. In general, the number of heat dissipating members is increased and the heat dissipating member 102 is in contact with the surrounding air. There is a method of increasing the area. However, if the number of heat dissipating members 102 is increased, the adjacent heat dissipating members 102 come close to each other, so that the gap between the heat dissipating members 102 is narrowed and it is difficult for air to flow through the gap. As a result, it is difficult for low-temperature air to flow around the heat dissipation member 102, and the cooling capacity may be reduced.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a light irradiation apparatus capable of efficiently cooling the inside of the apparatus.

  The present invention includes a substrate, a plurality of light emitting diodes mounted on a first surface of the substrate along a first direction, and a second surface of the substrate orthogonal to the first direction. A plurality of heat dissipating members arranged at predetermined intervals in the direction of 2, wherein the heat dissipating members form a plurality of flow paths extending in the first direction in the gaps between the adjacent heat dissipating members, and air An air suction unit that causes the flow path to generate an air flow along the first direction, and one end of each heat radiating member is disposed on the second surface. The plurality of channels include a small channel and a large channel having a gap larger than a gap between the small channels.

  According to this configuration, by sucking air by the air suction unit, a negative pressure is formed in the flow path between the heat radiating members, thereby generating an air flow in the flow path. Therefore, since an air flow can be generated even in a flow path having a narrow gap, a large number of heat dissipating members can be arranged, and the inside of the apparatus can be effectively cooled. In addition, since a large flow path with a large gap is formed in a part of the plurality of flow paths, low-temperature air can be sent to the downstream side of the large flow path. That is, in a flow path with a small gap, the temperature immediately rises when the fed air comes into contact with the heat radiating member, so it is difficult to feed low temperature air downstream. On the other hand, when the large flow path as described above is formed, a part of the air that is sent in comes into contact with the heat dissipating members on both sides of the large flow path, and the temperature rises as a whole, but the temperature rises greatly as a whole. It is possible to send low-temperature air to the downstream side without doing so. Therefore, heat exchange can also be performed effectively for the downstream heat radiating member, and as a result, the downstream LED can also be effectively cooled. In addition, although there exist various LED which this invention makes object, it can be set as the ultraviolet LED which irradiates a to-be-printed object with an ultraviolet-ray, for example.

  In the said light irradiation apparatus, the one end part of a several heat radiating member is arrange | positioned on a 2nd surface at equal intervals, and the adjacent heat radiating member which forms a large flow path is between the one end part and the other end part. The gap can be increased. If it does in this way, in the 2nd surface, since the one end part of a several heat radiating member is arrange | positioned at equal intervals, in the 2nd surface, it heats equally with respect to a board | substrate over the whole 2nd direction. Exchanges can be made. On the other hand, the adjacent heat dissipating members forming the large flow path are configured such that the gap between the one end portion and the other end portion is large, so that the air flow rate can be increased, as described above. In addition, the downstream LEDs can also be effectively cooled. The “equal intervals” described above do not need to be strictly equal intervals, and may be arranged so that heat can be exchanged almost uniformly with respect to the second direction of the substrate.

  In the said light irradiation apparatus, a large flow path can be arrange | positioned so as to correspond to the position where LED is mounted in a board | substrate. For example, when the LED is arranged at the center in the second direction of the first surface of the substrate, the large flow path can be similarly arranged at the center in the second direction on the second surface. By carrying out like this, since the flow volume of air increases in the position where LED is arrange | positioned, LED can be cooled effectively.

  The large flow path can be formed in various modes. For example, it can be formed from one end portion to the other end portion of the substrate in the first direction, or from one end portion in the first direction on the upstream side of the air flow, It can be formed over the middle part. The intermediate portion is any position between the one end and the other end, and does not necessarily mean near the center.

  In the said light irradiation apparatus, the division member arrange | positioned so as to oppose the 2nd surface of a board | substrate can further be provided. And a heat radiating member can be arrange | positioned between a 2nd surface and a division member, and each flow path can be divided by a 2nd surface, a pair of adjacent heat radiating member, and a division member. If comprised in this way, since the flow path of air forms the space closed in the cross section, air can be flowed at high speed and cooling efficiency can be improved.

  At this time, each heat radiating member and the said division member can be made to contact elastically. That is, the end portion of the heat radiating member can be arranged to be pressed by the dividing member. If it does in this way, even if the height of a heat radiating member varies, the closed channel as mentioned above can be formed reliably. Therefore, cooling can be performed more effectively.

  The light irradiation device further includes an air flow supply unit that is disposed on one end side in the first direction on the upstream side of the air flow with respect to the substrate, and discharges air. It can arrange | position to the other end part side of a 1st direction with respect to a board | substrate. If it does in this way, in addition to the suction of air by an air suction unit, since air can be sent into each channel from an air flow supply unit, a large amount of air can be sent into a channel. As a result, the LED can be cooled more effectively.

  According to the light irradiation apparatus of the present invention, the inside of the apparatus can be efficiently cooled.

1 is a side view illustrating a schematic configuration of a printing apparatus in which an ultraviolet irradiation device according to an embodiment of the present invention is used. 1 is a plan view illustrating a schematic configuration of a printing apparatus. It is a perspective view of an ultraviolet irradiation unit. It is the top view (a), side view (b), and bottom view (c) of a light irradiation apparatus. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is a perspective view of a division member. It is sectional drawing which showed typically the flow of the air in 2nd space. It is a front view which shows the other example of arrangement | positioning of a thermal radiation member. It is sectional drawing which shows the other example of arrangement | positioning of a thermal radiation member. It is sectional drawing which shows the other example of FIG. It is sectional drawing which shows the conventional cooling structure.

  Hereinafter, an embodiment in which the light irradiation apparatus of the present invention is applied to an ultraviolet irradiation apparatus in a printing apparatus will be described with reference to the drawings. FIG. 1 is a side view showing a schematic configuration of a printing apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view showing the schematic configuration of the printing apparatus.

(1) Printing Device As shown in FIGS. 1 and 2, the printing device 50 includes a center drum 51 at the center and a roll 53 that feeds out a sheet-like printed material P. The center drum 51 is connected to a rotation drive device 55 via a rotation shaft 54, and rotates around the rotation shaft 54 by driving of the rotation drive device 55. The rotation drive device 55 includes a known electric motor, a rotation belt, etc., not shown. The printed material P fed out from the roll 53 is wound around the center drum 51 through the guide roller 52a, and is further guided in the arrow X direction through the other guide rollers 52b and 52c. The center drum 51 is fed out from the roll 53 by the rotation of the center drum 51.

  The printing apparatus 50 includes a plurality of printing units 56 and ultraviolet irradiation units 57 that are arranged at intervals along the outer periphery of the center drum 51. That is, it is configured as a so-called satellite type printing apparatus. Each printing unit 56 is installed according to the color of ink used for printing. In this embodiment, black (K), cyan (C), magenta (M), yellow (Y), and transparent (OP) are used. A plurality of printing units corresponding to each color are installed. Each ink is a known ultraviolet curable ink. Each printing unit 56 is fixed to a support frame 58 so as to surround the center drum 51, and is installed so that ink can be supplied to the printing material P fed by the center drum 51 for printing. Yes.

  Each ultraviolet irradiation unit 57 is installed so as to follow each printing unit 56, and is fixed to the support frame 58 so as to surround the center drum 51. Each time the ink is applied from the printing units 56 to the printing material P fed by the center drum 51, the ultraviolet rays are irradiated from the ultraviolet irradiation units 57 to cure the ink. It is configured.

(2) Ultraviolet irradiation unit Next, an ultraviolet irradiation unit is demonstrated, referring drawings. FIG. 3 is a perspective view of the ultraviolet irradiation unit. The ultraviolet irradiation unit 57 includes an attachment 59 fixed to a support frame 58 (see FIG. 2), and an ultraviolet irradiation device 1 detachably attached to the attachment 59. The attachment 59 includes an attachment main body 60 formed in a rectangular tube shape, and flanges 61 provided at both ends in the axial direction of the attachment main body 60. The attachment main body 60 includes an insertion opening 62 formed at one end in the axial direction and a wall surface opening 63 formed on the wall surface of the side wall, and the light irradiation device 1 can be inserted through the insertion opening 62. The ultraviolet ray can be irradiated through the wall surface opening 63. On the inner surface of the side wall of the attachment body 60, a guide rail 64 for guiding the ultraviolet irradiation device 1 is installed so as to extend in the axial direction. The flange 61 protrudes laterally from the end of the attachment main body 60, and the attachment 59 can be fixed to the support frame 58 via the flange 61.

  Next, the ultraviolet irradiation device will be described in more detail with reference to FIGS. 4A is a top view of the ultraviolet irradiation device, FIG. 4B is a side view, FIG. 5C is a bottom view, FIG. 5 is a cross-sectional view taken along line AA in FIG. is there. In the following description, the left-right direction in FIG. 4 is referred to as the longitudinal direction, the left-right direction in FIG. 6 is referred to as the width direction, and the up-down direction in FIG. 6 is referred to as the up-down direction. The direction is defined for convenience, and does not limit the direction in the implementation of the present invention. As shown in FIGS. 4 to 6, the ultraviolet irradiation device 1 includes a rectangular parallelepiped casing 3, and an LED board 6, a partition member 4, and a control board 5 described later are provided in the internal space 2 of the casing. It has been.

  As shown in FIGS. 5 and 6, the casing 3 includes a plate-like base portion 7 having a rectangular shape in plan view extending in the horizontal direction, and a cover member 8 formed in a U-shaped cross section so as to cover the base portion 7. The above-described internal space 2 is formed by a region that is configured and surrounded by the base 7 and the cover member 8. An irradiation opening 9 extending in the longitudinal direction of the casing 3 (left and right direction in FIG. 5) is formed at the center of the base portion 7, and this irradiation opening 9 is formed in the thickness direction of the base portion 7 (up and down direction in FIG. 6). ). In addition, the lower surface of the base portion 7 is notched in multiple stages, and a pair of first installation surfaces 13 that sandwich the illumination opening 9 in the width direction are formed in the first stage, and the inner sides of the first installation surfaces 13 in the width direction. The second installation surface 11 is formed in each. The anti-stain plate 12 is disposed on the first installation surface 13, and the pair of reflector members 10 and 10 are installed on the second installation surface 11.

  The antifouling plate 12 is formed of a transparent plate material, and is fitted in an installation groove 13a formed at the outer end of each first installation surface 13 to cover the illumination opening 9 from below. As a material of the anti-stain plate 12, for example, quartz glass that transmits ultraviolet rays can be used. The anti-stain plate 12 is disposed in the wall surface opening 63 of the attachment 59 and is disposed so as to face the substrate P when irradiated with ultraviolet rays. On the other hand, each reflector member 10 is formed by bending a metal plate at a substantially right angle, and includes an outer reflecting portion 15 that contacts the second installation end surface 11 and an inner reflecting portion that bends and extends from the outer reflecting portion 15. 16. As a material of the reflector member 10, for example, a metal such as aluminum or stainless steel can be used, and the material is polished and mirror-finished so that ultraviolet rays can be reflected. Further, in each reflector member 10, the external reflection portion 15 is disposed between the second installation surface 11 and the antifouling plate 12 and faces outward of the casing 3. That is, the ultraviolet rays can be reflected to the outside of the casing 3. On the other hand, the inner reflection portions 16 are located in the irradiation opening 9 and are disposed so as to face each other with the irradiation opening 9 interposed therebetween. That is, it is arranged so that it can reflect ultraviolet rays toward the inside of the irradiation opening 9.

  As shown in FIG. 4, a plurality of vent holes 18 are formed on each side wall surface of the cover member 8, and the outside of the casing 3 communicates with the internal space 2 through the vent holes 18. Therefore, the air outside the casing 3 can be introduced into the internal space 2. An attachment / detachment roller 19 is rotatably attached to the outside of the wall surface of the cover member 8, and the attachment / detachment roller 19 is rotated along the guide rail 64 of the attachment 59, so that the ultraviolet irradiation device 1 is attached to the attachment 59. Can be put in and out. A handle 20 is attached to one end of the cover member 8 in the longitudinal direction.

  As shown in FIG. 6, the LED substrate 6 is formed of a flat plate member made of aluminum, and is disposed on the upper surface of the base portion 7 of the casing 3 so as to close the irradiation opening 9 from above. A plurality of ultraviolet LEDs 30 are mounted on the lower surface (first surface) of the LED substrate 6. The ultraviolet LEDs 30 are disposed so as to face downward from the irradiation opening 9, and are exposed to the outside (printed material P). It comes to irradiate ultraviolet rays.

  Above the base portion 7, a sorting member 4 that covers the LED substrate 6 is disposed. The sorting member 4 is formed by bending a metal plate-like member. The internal space 2 is divided into two regions by the dividing member 4. That is, in the internal space 2, a first space 21 is formed in a region surrounded by the partition member 4 and the cover member 8, and the first space 21 is formed in the casing 3 via the vent hole 18 of the cover member 8. Communicates with the outside. On the other hand, the partition member 4 forms a second space 22 through which air flows between the LED board 6 and the LED substrate 6 disposed on the base 7. The second space 22 accommodates a plurality of heat radiating members 32, as will be described later.

  FIG. 7 is a perspective view of the dividing member 4. The sorting member 4 includes an upper plate portion 25 extending in the horizontal direction and a side plate portion 26 bent from the upper plate portion 25 and extending in the vertical direction. A flange 26 a is formed at the lower end of the side plate portion 26, and the flange 26 a is fixed to the base portion 7 as shown in FIG. 6. In addition, a plurality of communication ports 23 are formed at one end portion in the longitudinal direction of the side plate portion 26, and the first space 21 and the second space 22 communicate with each other through the communication port 23. In addition, although illustration is abbreviate | omitted, at least 1 communicating port may be formed in the upper board part 25 of the division member 4, and the 1st space 21 and the 2nd space 22 can be connected also by this.

  An exhaust port member 27 extending continuously from the upper plate portion 25 is fixed to the other end portion of the sorting member 4 in the longitudinal direction. The exhaust port member 27 is installed so as to extend in an oblique direction from the end portion of the upper plate portion 25, thereby forming an exhaust port 28 that is expanded and connected to the second space 22. And the air suction device 31 mentioned later is arrange | positioned at the exit of the exhaust port 28 (refer FIG. 5). Further, as shown in FIGS. 5 and 6, a substrate support 24 is installed on the upper portion of the sorting member 4 and the exhaust port member 27, and the control substrate 5 is supported. That is, the substrate support base and the control substrate are disposed in the first space. A plurality of circuits are mounted on the control board 5 and controls operations of the ultraviolet LED 30, the air suction device 31, and other ultraviolet irradiation devices.

  Next, the plurality of heat radiating members 32 housed in the second space 22 will be described. Each heat radiating member 32 is comprised from the metal thin plate which curved (it is formed in fin shape), and is arrange | positioned at intervals in the width direction (2nd direction) of the casing 3. As shown in FIG. Each heat radiating member 32 extends in the vertical direction in the second space 22 and is disposed along the longitudinal direction (first direction) of the casing 3. A plurality of heat dissipating units including a plurality of heat dissipating members 32 arranged in the width direction are arranged at predetermined intervals in the longitudinal direction of the casing 3 (left and right direction in FIG. 5).

  As shown in FIG. 6, each heat radiating member 32 is curved and its lower end is placed on the upper surface of the LED substrate 6, and its upper end is in contact with the lower surface of the partition member 4. Further, the plurality of heat radiating members 32 arranged on the left side of FIG. 6 with the ultraviolet LED 30 interposed therebetween are curved so as to protrude outward in the width direction, and the plurality of heat radiating members 32 arranged on the right side. Is curved to be convex to the opposite side. With such an arrangement, a plurality of flow paths through which air flows are formed by the adjacent heat radiating member 32, the LED substrate 6, and the sorting member 4. These channels include a small channel 33, a large channel 35, and a side channel 34. The small flow path 33 is a narrow flow path formed between the heat radiating members 32 curved on the same side. The large flow path 35 is a flow path with a large gap formed in the center of the second space 22 in the width direction, and is formed by facing the concave surfaces of the heat radiation member 32 facing opposite to each other. Further, the side channel is a channel formed between each heat radiating member 32 disposed at the end in the width direction and each side plate portion 26 of the sorting member 4. The large flow path 35 and the side flow path 34 have a larger air flow rate than the small flow path. In addition, since each heat radiating member 32 has elasticity due to bending, it is in flexible contact (elastic contact) with the LED substrate 6 and the partition member 4 and is slightly compressed by the LED substrate 6 and the partition member 4. Yes. The length of the gap between the heat dissipation members 32 in the small flow path 33 is not necessarily limited depending on the required air cooling performance, the size of the ultraviolet irradiation device, and the like, but may be 2 to 4 mm, for example. Preferably 2.5 mm to 3.0 mm. Moreover, about the large flow path 35, about 2 to 10 times the clearance gap of the small flow path 33 is preferable, and about 4 to 6 times is further more preferable.

  As the air suction device 31 provided at the end of the sorting member 4, a known blower that pumps air can be used. By driving the air suction device 31, the air outside the casing 3 is passed through the vent 18. Then, the air is sucked into the casing 3, thereby generating an air flow in the internal space 2 (the first space 21 and the second space 22). Then, by the operation of the air suction device 31, the air in the internal space 2 is discharged to the outside of the casing 3 through the exhaust port 28.

(3) Operation of Ultraviolet Irradiation Unit Next, the operation of the ultraviolet irradiation device 1 configured as described above will be described. First, the ultraviolet LED 30 and the air suction device 31 are driven by turning on the power supply (not shown) with the ultraviolet irradiation device 1 attached to the attachment 59. The printed material P is irradiated with ultraviolet rays by the light emitted from the ultraviolet LED 30. Further, air is sucked from the second space 22 through the discharge port 28 by driving the air suction device 31. Thereby, since negative pressure is generated in the second space 22, air flows from the first space 21 to the second space 22 through the communication port 23 of the partition member 4, and air outside the casing 3 is vented. 18 flows into the first space 21. Thus, the air flowing into the second space 22 from the communication port 23 flows along the longitudinal direction of the casing 3 (from the left side to the right side in FIG. 5), and generates an air flow in each of the flow paths 33, 34, and 35. And each heat radiating member 32 is cooled by this air flow. Moreover, since the lower end part of each heat radiating member 32 is connected to LED board 6, the heat which generate | occur | produced in ultraviolet LED30 is transmitted. Therefore, heat exchange is performed between the heat radiation member 32 and the ultraviolet LED 30, and the ultraviolet LED 30 is cooled. Further, since the air flow flows into the first space 21, the control board 5 is also cooled. Then, the air sucked into the air suction device 31 is discharged to the outside of the casing 3.

(4) Effects of the ultraviolet irradiation unit According to the ultraviolet irradiation unit configured as described above, by sucking air with the air suction device 31, a negative pressure is formed in the flow path between the heat radiating members 32. Generating airflow. Therefore, since the air flow can be generated even in the flow paths 33, 34, and 35 having a narrow gap, a large number of heat dissipating members 32 can be arranged, and the inside of the apparatus can be effectively cooled. Moreover, since the large flow path 35 is formed, the following effects can be obtained. That is, in the small flow path 33 with a small gap, since the temperature immediately rises when the sent air contacts the heat radiating member 32, it is difficult to send low temperature air to the heat radiating member 32 on the downstream side. In the large flow path 35, although a part of the air sent to the heat radiating member 32 on both sides contacts, the low-temperature air can be sent to the downstream side as a whole without significantly increasing the temperature of the air flow. . This point will be schematically shown and described with reference to FIG. FIG. 8 is a cross-sectional view of the second space 22. In the example of the figure, four heat radiating units 32a to 32d are arranged from upstream to downstream, and low temperature air is indicated by arrows. The temperature of the air flowing through the large flow path 35 is increased by the heat dissipating members 32 disposed on both sides of the air, but since the flow rate of air is large, the temperature of the air flowing through the large flow path does not increase as a whole. Still cold air is mixed. Thus, although the air flow is warmed every time it passes through the heat radiating units 32a to 32d, it is possible to flow low-temperature air also to the downstream heat radiating unit (for example, 32d). In particular, the ultraviolet LED 30 may have a short lifetime or decrease in illuminance unless it is properly cooled. Therefore, if each ultraviolet LED 30 is not evenly cooled, the ultraviolet LED 30 in one ultraviolet irradiation device 1 may be reduced. Although there is a possibility that the lifetime and the illuminance may vary, such a problem can be improved by configuring as in the present embodiment. In this example, the large flow path 35 is formed only in the center in the width direction. However, since the large flow path 35 is disposed immediately above the ultraviolet LED 30, the downstream ultraviolet LED 30 is also effectively cooled. be able to. Moreover, the same effect can be acquired also about the side part flow path 34 with a large cross-sectional area of a flow path.

  Furthermore, since the heat radiating member 32 is composed of a curved metal plate and has elasticity, the height of the heat radiating member 32 varies by slightly compressing the heat radiating member 32 in the vertical direction by the LED substrate 6 and the partition member 4. Even if it exists, the narrow flow path 33 can be formed reliably. Therefore, cooling can be performed more effectively.

(5) Modifications Although one embodiment of the present invention has been described above, a specific aspect of the present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the heat dissipation member 32 has a curved shape in a cross-sectional view, but this shape is not particularly limited. For example, in a cross-sectional view, a shape such as a straight shape, a wavy shape, a bent shape, etc. It may be. Moreover, the formation method of the large flow path 35 is not specifically limited, As mentioned above, not only the aspect which curves the heat radiating member 32 and makes concave surfaces face each other, for example, FIG. 9 (a) and FIG. As shown in (b), the heat radiating member 32 may be bent at one place or a plurality of places to form a concave surface and face each other. Further, as shown in FIG. 9C, instead of bending the heat radiating member 32, the heat radiation member 32 is inclined outward in the width direction upward, and a V-shaped large flow path 35 is formed in the central portion of the second space 22. Can also be formed. In the case of this aspect, the angle α between the heat radiating members 32 adjacent to each other with the large flow path 35 interposed therebetween can be set to, for example, about 50 to 60 °. Moreover, as shown in FIG.9 (d), a large flow path can also be formed in several places by changing the grade (curvature radius) of a curve. In this example, the heat radiating member 32 on the left side in the width direction is divided into two heat radiating member groups 321 and 322, and the radius of curvature of the heat radiating member group 322 on the outer side in the width direction is smaller than that of the central heat radiating member group 321. A large flow path 351 is formed between the two heat dissipating member groups 321 and 322. Similarly, the heat radiating member 32 on the right side in the width direction is configured similarly. Similarly, large channels can be formed at a plurality of locations. Alternatively, the large flow path 35 can be formed simply by removing the heat radiating member 32 from the substrate 6.

  Moreover, although the large flow path 35 is formed over the whole longitudinal direction of the internal space 2, as shown in FIG. 10, the large flow path 35 can also be formed from the upstream to the intermediate part, for example. . If comprised in this way, since air can be directly sprayed with respect to the heat radiating member 32 arrange | positioned so that the downstream of the large flow path 35 may be plugged up, a cooling effect can be heightened. The large flow path 35 described above is formed by increasing the gap between the adjacent heat radiating members 32 between the lower end portion and the upper end portion of the heat radiating member 32, but is in contact with the LED substrate 6. It is preferable that the lower end part of each heat radiating member is arrange | positioned at substantially equal intervals.

  Moreover, the material of the LED substrate 6 is not particularly limited, and the ultraviolet LED 30 can be cooled more efficiently if a material having high thermal conductivity is used. Moreover, the material of the heat radiating member 32 is not particularly limited, and the cooling effect can be enhanced by using a material having high thermal conductivity such as aluminum.

  Moreover, in the said embodiment, although the division member 4 consisted of a bending-shaped member and was the structure which forms the 2nd space 22, it is not limited to this structure. For example, as shown in FIG. 11, the partition member 4 is formed in a flat plate shape, and the lower surface thereof is disposed so as to contact the upper end portion of the heat dissipation member 32. Even with such a configuration, the large flow path 35 and the small flow path 33 can be formed by the adjacent heat radiating member 32, the LED substrate 6, and the sorting member 4.

  Moreover, in the said embodiment, as shown in FIG. 6, although the several heat radiating member 32 arrange | positioned in parallel was all the structures which an upper end part contacts the division member 4, it is not limited to this structure, It is not necessarily It is not necessary for all the heat radiating members 32 to come into contact with the dividing member 4. For example, some of the plurality of heat dissipating members 32 arranged in parallel (for example, the plurality of heat dissipating members 32 on the left half of the center in FIG. 6) are in contact with the partition member 4, and the other part (for example, The plurality of heat radiation members 32) on the right half from the center of FIG. 6 may not be in contact with the partition member 4. Even with such a configuration, a part of the plurality of heat radiating members 32, that is, a plurality of heat radiating members 32 in contact with the partition member 4 (for example, a plurality of heat radiating members 32 on the left half from the center of FIG. 6). A plurality of flow paths can be formed.

  Although the said heat radiating member 32 can be formed in various aspects, it can create separately from the LED board 6, and can adhere the lower end part to the LED board 6. FIG. The LED board 6 can also laminate | stack two or more board | plate materials. For example, the LED substrate 6 can be formed by laminating another substrate on which the heat dissipation member 32 is disposed on the upper surface of the substrate on which the ultraviolet LED 30 is mounted. Moreover, the heat radiating member 32 and the LED board 10 can also be formed integrally. For example, the heat radiating member 32 can be cut out from a metal substrate and disposed so as to extend in the vertical direction.

  Moreover, in the ultraviolet irradiation device 1 according to the above-described embodiment, the air suction device 31 is disposed on the downstream side of the flow path, but an air supply device that supplies air to the upstream side can also be disposed. Such an air suction device can be constituted by a known blower. When such an air suction device is arranged, for example, an intake port member having the same configuration as that of the downstream exhaust port member 27 is provided on the upstream side of the dividing member 4, and the air from the air supply device is secondly supplied. Make it easy to guide to the space 22. By providing such an air suction device, the flow rate of air flowing into the second space 22 can be increased. Moreover, when the dimension of the longitudinal direction (left-right direction of FIG. 6) of the casing 3 is long, you may arrange | position two or more each structural member arrange | positioned inside the casing 3 in parallel with a longitudinal direction. That is, a plurality of partition members 4, air suction devices 31, and the like can be arranged in the casing 3 in parallel in the longitudinal direction. Even with such a configuration, the inside of the light irradiation apparatus 1 can be cooled by the constituent members arranged in parallel.

  In the above description, the light irradiation device is used as an ultraviolet irradiation device for drying the ink of the printed material. However, any device can be used as long as it can emit ultraviolet light. In the above embodiment, the ultraviolet LED 30 that irradiates ultraviolet rays is used. However, the present invention is not limited to this configuration, and a light emitting diode that emits light in other wavelength ranges can be used instead of the ultraviolet LED 30. For example, a light emitting diode that emits visible light can be used in place of the ultraviolet LED 30.

1 UV irradiation device (light irradiation device)
6 LED board (board)
30 UV LED (Light Emitting Diode)
31 Air suction device (Air suction unit)
32 Heat dissipation member 33 Small flow path 35 Large flow path

Claims (8)

A substrate,
A plurality of light emitting diodes mounted on a first surface of the substrate along a first direction;
A plurality of heat dissipating members disposed on the second surface of the substrate at a predetermined interval in a second direction orthogonal to the first direction, wherein the first heat dissipates between the adjacent heat dissipating members; A plurality of heat dissipating members forming a plurality of flow paths extending in the direction of
An air suction unit that generates air flow along the first direction in the flow path by sucking air; and
With
One end of each of the heat dissipating members is disposed on the second surface,
The plurality of flow paths include a small flow path and a large flow path having a gap larger than a gap between the small flow paths. One end portions of the plurality of heat dissipation members are arranged on the second surface at equal intervals,
The light irradiation apparatus according to claim 1, wherein the adjacent heat dissipating members forming the large flow path are configured such that the gap is increased between the one end portion and the other end portion.   The light irradiation apparatus according to claim 1, wherein the large flow path is formed to correspond to a position where the light emitting diode is mounted.   The said large flow path is formed in the intermediate part of the said 2nd surface from the one end part of the said 1st direction which is the upstream of the said airflow, The any one of Claim 1 to 3 Light irradiation device.   The light irradiation apparatus according to claim 1, wherein the large flow path is formed from one end portion to the other end portion in the first direction. A partition member disposed to face the second surface of the substrate;
The heat dissipating member is disposed between the second surface and the partition member, and each of the flow paths is partitioned by the second surface, a pair of adjacent heat dissipating members, and the partition member. Item 6. The light irradiation device according to any one of Items 1 to 5.   The light irradiation apparatus according to claim 6, wherein each of the heat dissipating members and the dividing member are in elastic contact. An air supply unit that is disposed on one end side in the first direction that is upstream of the air flow with respect to the substrate, and further discharges air,
The light irradiation apparatus according to claim 1, wherein the air suction unit is disposed on the other end side in the first direction with respect to the substrate.

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