Cooling device and light irradiation device

Abstract

To provide a cooling device that saves space and has excellent cooling efficiency.SOLUTION: A cool device 1 includes a heat sink 3 having a plurality of heat radiation fins f arranged in parallel in the longitudinal direction while being separated from each other, and an electric fan 2 in which a rotary blade v is housed in a rectangular frame r arranged on the heat sink, and the arrangement width l of the plurality of heat radiation fins in the direction orthogonal to the longitudinal direction of the heat radiation fins has a length equal to or larger than the diameter D of the rotary blades constituting the electric fan. When viewed from the front from the electric fan side, the electric fan is arranged at an angle of 3° to 45° with respect to the longitudinal direction of the heat radiation fins.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a cooling device and a light irradiation device.

Background Art

[0002] Conventionally, ultraviolet curable ink that cures by irradiation with ultraviolet light has been used as ink for offset sheet-fed printing. Further, an ultraviolet curable resin is used as a sealant for flat panel displays (FPDs) such as liquid crystal panels and organic EL (Electro Luminescence) panels. In general, a light irradiation device that irradiates ultraviolet light is used for curing such ultraviolet curable ink and ultraviolet curable resin. However, particularly in the fields of offset sheet-fed printing and sealing applications for FPDs, since it is necessary to irradiate an ultraviolet light with a high irradiation intensity to a wide rectangular irradiation region, a light irradiation device having a wide light source arranged to face the irradiation region is used (see, for example, Patent Document 1).

[0003] As a light source for ultraviolet light irradiation provided in the above light irradiation device, a low-pressure mercury lamp has conventionally been used. However, in recent years, due to demands for energy saving and the like, a change has been made to a substrate (LED package) in which a large number of LED elements are arranged in the longitudinal direction.

[0004] Examples of such a light irradiation device include those having an LED package from the beginning of manufacture, and those in which a conventionally used low-pressure mercury lamp or the like is replaced with an LED package.

[0005] In the above light irradiation device, usually, in order to release the heat generated by the light source to the outside, a heat sink having a large number of fins for heat dissipation is disposed on the light source, and further, a cooling fan (electric fan) is disposed on the heat sink as a cooling means to improve the heat dissipation efficiency.

[0006] FIG. 12 is a schematic diagram for explaining a configuration example of a cooling device for a conventional light irradiation device. FIG. 12(a) is a front view of a cooling device 11 including a heat sink 13 and an electric fan 12 for cooling a light source (not shown) composed of an LED package, as viewed from the side where the electric fan 12 is provided. Further, FIG. 12(b) shows a side view of the cooling device 11 shown in FIG. 12(a). As shown in FIGS. 12(a) and 12(b), the cooling device 11 has an electric fan 12 disposed on the heat sink 13 and is arranged adjacent to a light source (not shown) located on the back side of the paper of FIG. 12(a) or the left side of FIG. 12(b).

[0007] As shown in FIGS. 12(a) and 12(b), in the cooling device of a conventional light irradiation device, in an electric fan 12 in which a rotating blade v having a diameter D larger than the arrangement width l of a plurality of heat radiation fins f is housed in a rectangular frame r, the electric fan 12 is fixed to a flat portion p at the end of the heat sink 13 with bolts or the like using fixing portions s provided at the corners of the rectangular frame r, and a plurality of them are installed. By rotating the rotating blade v having a diameter D larger than the arrangement width l of the plurality of fins, air is blown from the gaps between the fins f to the light source side (located on the left side of FIG. 12(b)) over the entire arrangement width l of the plurality of fins f, and the air heated by the light source (located on the left side of FIG. 12(b)) is discharged from the gaps between the fins to the right side of FIG. 12(b), thereby cooling the light source.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] By the way, in recent years, there has been a demand for compactness of light irradiation devices. Since the installation space for the cooling device is also limited along with the light source, a cooling device that saves space and has excellent cooling efficiency has been demanded.

[0010] In order to solve the above technical problems, as a result of intensive studies by the present inventor, it has been found that there is a region that contributes little to cooling when blowing air from the gap between the fins to the light source side or discharging the air heated by the light source from the gap between the fins for cooling in the rotation region of the rotating blades constituting the electric fan.

[0011] FIG. 13 is a partially enlarged view around the electric fan 12 in FIG. 12(a). Among the rotation regions of the rotating blades v constituting the electric fan 12, the portion indicated by hatching in FIG. 13 is for blowing air from the gap between the fins f, f to the light source side (located on the back side of the paper of the figure) or discharging the air heated by the light source (located on the back side of the paper of the figure) from the gap between the fins to the front side of the paper of the figure for cooling. It has been found that it contributes little to cooling. This is because there is no gap between the fins f, f in the hatched portion of FIG. 13. Therefore, even when the electric fan 12 is started, in the above portion, it is considered that air cannot be blown from the rotating blades v to the light source side (located on the back side of the paper of the figure) or the air heated from the light source side (located on the back side of the paper of the figure) cannot be discharged to the front side of the paper of the figure.

[0012] Therefore, the applicant conceived of increasing the number of fins constituting the heat sink. FIGS. 14(a) and 14(b) are diagrams corresponding to FIGS. 12(a) and 12(b), respectively. The cooling device 11 shown in FIGS. 14(a) and 14(b) has an increased number of fins f and a longer arrangement width l of the fins compared to the cooling device 11 shown in FIGS. 12(a) and 12(b). Accordingly, the cooling device 11 shown in FIG. 14(a) is considered to be able to improve the cooling efficiency because there are gaps between the fins f, f across the entire rotation region of the rotating blades v compared to the cooling device 11 shown in FIG. 12(a).

[0013] On the one hand, in the cooling device 11 shown in FIGS. 14(a) and 14(b), due to the large arrangement width l of the fins, when installing the electric fan 12 using the fixing part s, it is impossible to fix it to the flat part p at the end of the heat sink 13. Therefore, as in the heat sink 13 described in FIG. 14(c), it is necessary to separately provide installation members h such as bolt fixing members and fixing bolts in the installation area of the fins f. In this case, since it is necessary to remove the fins at the installation location of the installation member h and the like, the cooling efficiency will be reduced.

[0014] The present invention has been made in view of the above circumstances, and an object thereof is to provide a cooling device that saves space and has excellent cooling efficiency, and to provide an optical irradiation device having such a cooling device.

Means for Solving the Problems

[0015] Based on the above findings, the inventor of the present invention further studied and found that a heat sink having a plurality of heat dissipation fins arranged in parallel in the longitudinal direction in a separated state from each other, and an electric fan disposed on the heat sink and having rotating blades accommodated in a rectangular frame, wherein the arrangement width of the plurality of heat dissipation fins in the direction orthogonal to the longitudinal direction of the heat dissipation fins is the same as or longer than the diameter of the rotating blades constituting the electric fan, and when viewed from the front in the electric fan side, the electric fan is inclined at an angle of 3° to 45° with respect to the longitudinal direction of the heat dissipation fins. It has been found that the above technical problems can be solved by the cooling device, and the present invention has been completed based on this finding.

[0016] That is, the present invention is (1) A heat sink having a plurality of heat dissipation fins arranged in parallel in the longitudinal direction in a separated state from each other, and an electric fan disposed on the heat sink and having rotating blades accommodated in a rectangular frame, wherein the arrangement width of the plurality of heat dissipation fins in the direction orthogonal to the longitudinal direction of the heat dissipation fins is the same as or longer than the diameter of the rotating blades constituting the electric fan, When viewed from the front in the direction of the electric fan, the electric fan is disposed at an angle of 3° to 45° with respect to the longitudinal direction of the heat radiating fins. The cooling device is characterized by the above. (2) The cooling device according to (1) above, wherein a plurality of the electric fans are arranged on the heat sink. (3) The cooling device according to (1) or (2) above, wherein the electric fan is fixed to the heat sink at a pair of fixing portions provided at the corners of the rectangular frame constituting the electric fan and located opposite to each other on the diagonal line of the rectangular frame. (4) The relationship between the arrangement width of the plurality of heat radiating fins and the length of one side of the rectangular frame constituting the electric fan satisfies the following formula TIFF0007705704000001.tif12137 The cooling device according to any one of (1) to (3) above. (5) Fixing portions are provided at the corners of the rectangular frame constituting the electric fan, and the diameter of the rotating blades constituting the electric fan is larger than the distance between adjacent fixing portions of the rectangular frame. The cooling device according to any one of (1) to (4) above. (6) Having a long light source and the cooling device according to any one of (1) to (5) above, The cooling device is arranged such that the main surface of the heat sink on the side opposite to the side where the electric fan is installed faces the long light source. The light irradiation device is characterized by the above. is provided.

Effect of the Invention

[0017] According to the present invention, a cooling device with excellent cooling efficiency in a space-saving manner can be provided, and a light irradiation means having such a cooling device can be provided.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Mode for Carrying Out the Invention

[0019] The cooling device according to the present invention includes a heat sink having a plurality of heat dissipation fins arranged in parallel in the longitudinal direction while being spaced apart from each other, and an electric fan disposed on the heat sink and having rotating blades accommodated in a rectangular frame. The arrangement width of the plurality of heat dissipation fins in a direction orthogonal to the longitudinal direction of the heat dissipation fins is equal to or greater than the diameter of the rotating blades constituting the electric fan. When viewed from the front in the direction of the electric fan side, the electric fan is arranged at an angle of 3° to 45° with respect to the longitudinal direction of the heat dissipation fins.

[0020] Hereinafter, the device form of the cooling device according to the present invention will be described as appropriate with reference to the drawings.

[0021] FIG. 1 shows an example of one form of the cooling device according to the present invention.

[0022] As illustrated in FIG. 1, the cooling device 1 according to the present invention includes an electric fan 2 and a heat sink 3.

[0023] As shown in FIG. 1, in the cooling device 1 according to the present invention, the arrangement width l (the installation width of the plurality of heat dissipation fins f in a direction orthogonal to the longitudinal direction of the plurality of heat dissipation fins f) of the plurality of heat dissipation fins f constituting the heat sink is larger than the diameter D of the rotating blades v constituting the electric fan 2.

[0024] As described above, since the arrangement width l of the plurality of heat dissipation fins f is larger than the diameter D of the rotating blades v constituting the electric fan 2, there are gaps between the fins f, f throughout the rotation region of the rotating blades v, so that the cooling efficiency can be easily improved.

[0025] As shown in FIG. 1, in the cooling device 1 according to the present invention, when viewed from the front in the direction of the side where the electric fan is disposed, the electric fan 2 is arranged at an angle of 3° to 45° with respect to the longitudinal direction of the heat dissipation fins f.

[0026] In the present invention, the electric fan being disposed obliquely means that when the cooling device according to the present invention is viewed from the front on the electric fan side, a pair of sides (upper side and lower side) of the rectangular frame of the electric fan are disposed on the heat sink in an inclined state so as to form a certain angle with respect to the longitudinal direction of the heat radiation fins constituting the heat sink.

[0027] FIG. 2 is a diagram for explaining the inclined arrangement form of the electric fan in the cooling device according to the present invention.

[0028] FIG. 2(a) is a diagram showing an example of an arrangement form in which the electric fan 12 is disposed without being inclined with respect to the heat sink 3 (the inclination angle of the electric fan 12 with respect to the longitudinal direction of the heat radiation fin f is 0°). In the arrangement form shown in FIG. 2(a), the electric fan 12 is disposed on the heat sink 13 such that a pair of sides (the upper side and the lower side of the rectangular frame r of the electric fan shown in FIG. 2(a)) of the rectangular frame r constituting the electric fan are parallel to the longitudinal direction of the heat radiation fin f constituting the heat sink.

[0029] On the other hand, FIG. 2(b) is a diagram showing an example of an arrangement form of the cooling device 1 according to the present invention in which the electric fan 2 is disposed obliquely with respect to the heat sink 3 (the electric fan is disposed obliquely at an inclination angle α with respect to the longitudinal direction of the heat radiation fin f). In the arrangement form shown in FIG. 2(b), the electric fan 2 is disposed on the heat sink obliquely such that a pair of sides (the upper side and the lower side of the rectangular frame r of the electric fan shown in FIG. 2(a)) of the rectangular frame r constituting the electric fan form an angle α with respect to the longitudinal direction of the heat radiation fin f constituting the heat sink.

[0030] As shown in Fig. 2(a), when the electric fan 12 is arranged on the heat sink 13 such that a pair of sides (the upper side and the lower side of the rectangular frame r shown in the figure) of the rectangular frame r constituting the electric fan are parallel to the longitudinal direction of the heat dissipation fins f constituting the heat sink, when installing the electric fan 2 using the fixing portion s, it is impossible to fix it to the flat portion p at the end of the heat sink 13. For this reason, it is necessary to separately provide installation members h such as bolt fixing members and fixing bolts in the installation area of the fins f. In this case, since it is necessary to remove the fins at the installation location of the installation member h and the like, the cooling efficiency will be reduced.

[0031] On the contrary, in the cooling device 1 according to the present invention, as shown in Fig. 2(b), the electric fan is arranged on the heat sink so that a pair of sides of the rectangular frame r constituting the electric fan form an angle α with respect to the longitudinal direction of the heat dissipation fins f constituting the heat sink. When installing the electric fan 2 using the fixing portion s, it is possible to fix it to the flat portion p at the end of the heat sink 3. Since it is not necessary to separately install bolt fixing members, fixing bolts, etc. in the installation area of the fins f, or to remove the fins, etc. for installing these, excellent cooling efficiency can be easily exhibited.

[0032] In the cooling device according to the present invention, when viewed from the front in the side where the electric fan is installed, the electric fan is arranged at an angle of 3° to 45° with respect to the longitudinal direction of the heat dissipation fins, more preferably arranged at an angle of 10° to 45°, and even more preferably arranged at an angle of 20° to 40°.

[0033] In the cooling device according to the present invention, when viewed from the front in the side of the electric fan, since the electric fan is arranged at the above angle with respect to the longitudinal direction of the heat dissipation fins, it is possible to easily provide a cooling device with excellent cooling efficiency and space saving.

[0034] The cooling device according to the present invention is configured such that an electric fan is disposed on a heat sink. As illustrated in FIG. 1, only one electric fan 2 may be disposed on the heat sink 3 in the cooling device 1 according to the present invention. Alternatively, as illustrated in FIG. 3, a plurality of (three in the example of this figure) electric fans 2 may be disposed on the heat sink 3 in the cooling device 1 according to the present invention.

[0035] When the cooling device according to the present invention is used for cooling an ultraviolet irradiation light source, the heat sink constituting the cooling device also has an elongated shape (strip shape) so as to correspond to the shape of the light source. Therefore, it is preferable that a plurality of electric fans disposed on such a heat sink are arranged in a form that enables uniform cooling. More preferably, (as illustrated in FIG. 3) a plurality of electric fans are juxtaposed on the heat sink.

[0036] When the cooling device according to the present invention has a plurality of electric fans disposed on a heat sink, each electric fan may be the same or different. However, in order to equalize the cooling effect over the entire arrangement region of the radiation fins, it is preferable that they are the same. Also, when the cooling device according to the present invention has a plurality of electric fans disposed on a heat sink, the inclination angles (the inclination angle α in the example of FIG. 3) at the time of arranging each electric fan may be the same or different from each other. However, in order to equalize the cooling effect over the entire arrangement region of the radiation fins, it is preferable that the inclination angles are also the same.

[0037] When the cooling device according to the present invention includes a plurality of electric fans arranged on a heat sink, it is preferable that the distance between the axes of the rotating blades accommodated in adjacent electric fans (represented by a in the example shown in FIG. 3) is shorter (i.e., the plurality of electric fans are arranged more closely) for enhancing the cooling efficiency. On the other hand, it is preferable that the plurality of electric fans are arranged at regular intervals in the length direction of the heat sink (the lateral length of the heat sink) in a direction parallel to the longitudinal direction of the radiation fins (represented by L6 in the example shown in FIG. 5(a) described later), so that the cooling effect can be made uniform over the entire heat sink. Therefore, it is preferable to appropriately determine the arrangement interval of the electric fans in consideration of the above matters. When the cooling device according to the present invention includes a plurality of electric fans arranged on a heat sink, the "distance between the axes of the rotating blades / the length of one side of the rectangular frame that accommodates the rotating blades", which is defined by the distance between the axes of the rotating blades accommodated in adjacent electric fans (represented by a in the example shown in FIG. 3) and the length of one side of the rectangular frame that accommodates the rotating blades (represented by d2 in the example shown in FIG. 4 described later), is preferably from 1.10 to 1.70, more preferably from 1.25 to 1.50, and even more preferably from 1.30 to 1.48.

[0038] As illustrated in FIG. 3, when the cooling device according to the present invention has a plurality of electric fans, all the electric fans may blow air from the gaps between the fins to the light source side (arranged on the back side of the paper surface of FIG. 3), or all the electric fans may discharge the air heated by the light source from the gaps between the fins to the front side (on the paper surface of FIG. 3), or some of the electric fans may blow air from the gaps between the fins to the light source side (arranged on the back side of the paper surface of FIG. 3) while the other electric fans discharge the air heated by the light source from the gaps between the fins to the front side (on the paper surface of FIG. 3).

[0039] FIG. 4 shows a morphological example of the electric fan that constitutes the cooling device according to the present invention. FIG. 4(a) shows a view when the electric fan 2 is viewed from the front from its main surface side, and FIG. 4(b) shows a side view of the electric fan 2.

[0040] In the cooling device according to the present invention, the diameter of the rotating blades constituting the electric fan (indicated by D in the example shown in FIG. 4(a)) is not particularly limited as long as it is the same as or less than the arrangement width of a plurality of heat radiation fins in the direction orthogonal to the longitudinal direction of the heat radiation fins.

[0041] In the cooling device according to the present invention, when fixing portions are respectively provided at the corners of the rectangular frame (indicated by s in the example shown in FIG. 4(a)), the distance between adjacent fixing portions s, s (indicated by d1 in FIG. 4(a)) is not particularly limited. In the present application documents, adjacent fixing portions mean fixing portions provided at both ends on one side of the rectangular frame (fixing portions s, s provided at both ends on one side of the rectangular frame r illustrated in FIG. 4(a)).

[0042] In the cooling device according to the present invention, fixing portions are respectively provided at the corners of the rectangular frame constituting the electric fan, and it is appropriate that the diameter of the rotating blades constituting the electric fan is larger than the distance between adjacent fixing portions of the rectangular frame (the diameter D of the rotating blades shown in FIG. 4(a) > the distance d1 between adjacent fixing portions).

[0043] In the cooling device according to the present invention, the length of one side of the rectangular frame that houses the rotating blades (indicated by d2 in the example shown in FIG. 4(a)) is not particularly limited as long as it is larger than the diameter of the rotating blades (indicated by D in the example shown in FIG. 4(a)) and can accommodate the rotating blades. In the cooling device according to the present invention, the rectangular frame usually has a square shape when viewed from the front.

[0044] FIG. 5 shows a morphological example of a heat sink constituting the cooling device according to the present invention. FIG. 5(a) shows a view when the heat sink 3 is viewed from the front side of the main surface on which the electric fan is arranged, and FIG. 5(b) shows a side view of the heat sink 3.

[0045] In the cooling device according to the present invention, the length in the longitudinal direction of the heat radiation fins constituting the heat sink (indicated by L1 in the example shown in FIG. 5(a)) is not particularly limited.

[0046] In the cooling device according to the present invention, the height (depth of the heat radiation fins) of the heat radiation fins constituting the heat sink (indicated by L2 in the example shown in FIG. 5(b)) is also not particularly limited.

[0047] In the cooling device according to the present invention, the thickness of the heat radiation fins constituting the heat sink (indicated by L3 in the example shown in FIG. 5(b)) is also not particularly limited.

[0048] In the cooling device according to the present invention, the thickness of the heat sink (indicated by L4 in the example shown in FIG. 5(b)) is also not particularly limited.

[0049] In the cooling device according to the present invention, the length of the heat sink in the direction orthogonal to the longitudinal direction of the heat radiation fins (the vertical length of the heat sink, indicated by L5 in the example shown in FIG. 5(a)) is also not particularly limited.

[0050] In the cooling device according to the present invention, the preferable range of the length of the heat sink in the direction parallel to the longitudinal direction of the heat radiation fins (the lateral length of the heat sink, indicated by L6 in the example shown in FIG. 5(a)) is the same as the preferable range of the length in the longitudinal direction of the above heat radiation fins (indicated by L1 in the example shown in FIG. 5(a)).

[0051] In the cooling device according to the present invention, the arrangement width of a plurality of heat radiation fins in the direction orthogonal to the longitudinal direction of the heat radiation fins (indicated by l in the examples shown in FIGS. 5(a) and 5(b)) is the same as the diameter of the rotating blades constituting the electric fan arranged on the heat sink or has a length larger than the diameter of the rotating blades. Note that in this application document, the arrangement width of a plurality of heat radiation fins means the distance between the outermost ends on the bottom surface of the grooves formed at both ends of the plurality of juxtaposed heat radiation fins (the distance between g1 and g2 in the example shown in FIG. 5(b)).

[0052] In the cooling device according to the present invention, the number of a plurality of heat radiation fins constituting a heat sink (indicated by f in the examples shown in FIGS. 5(a) and 5(b)) is not particularly limited as long as it satisfies the arrangement width of the plurality of heat radiation fins in the direction orthogonal to the longitudinal direction of the heat radiation fin, and may be appropriately selected in consideration of the cooling efficiency and the like.

[0053] In the cooling device according to the present invention, examples of the constituent material of the heat radiation fin or the heat sink include one or more selected from aluminum, copper, iron, stainless steel, and the like.

[0054] FIG. 6 shows an example of an arrangement in which the electric fan 2 is arranged on the heat sink 3 in the cooling device according to the present invention. As shown in FIG. 6, since the rectangular frame r of the electric fan 2 generally forms a square shape when viewed from the front, the arrangement width l of the plurality of heat radiation fins satisfies the following formula in relation to the length d2 of one side of the rectangular frame constituting the electric fan. It is appropriate to satisfy TIFF0007705704000002.tif14127. Since the length d2 of one side of the rectangular frame constituting the electric fan satisfies the above relationship in relation to the arrangement width l of the plurality of heat radiation fins, the electric fan 2 can be fixed to the outside of the arrangement region of the plurality of heat radiation fins f (the flat portion p in the example shown in FIG. 6) by the fixing portion s provided at the corner of the rectangular frame r, and the electric fan 2 can be arranged inclined with respect to the longitudinal direction of the heat radiation fin.

[0055] Also, in the example shown in FIG. 6, the length of the heat sink in the direction orthogonal to the longitudinal direction of the heat radiation fin 3 indicated by L5 (the longitudinal length in the vertical direction of the heat sink) satisfies the following formula in relation to the length d2 of one side of the rectangular frame constituting the electric fan. It is appropriate to satisfy TIFF0007705704000003.tif14127. The length d2 of one side of the rectangular frame constituting the electric fan satisfies the above relationship with the arrangement width l of the plurality of heat radiation fins, so that the electric fan 2 can be easily fixed to the outside of the arrangement region of the heat radiation fins f (the flat portion p in the example shown in FIG. 6) while being arranged inclined with respect to the longitudinal direction of the heat radiation fins by the fixing portion s provided at the corner of the rectangular frame r.

[0056] Next, in the cooling device according to the present invention, a fixing form for fixing the heat radiation fins to the heat sink will be described. The fixing form example shown in FIGS. 7 to 9 is a form example in which the electric fan 2 is arranged on the heat sink at an angle of 45° with respect to the longitudinal direction of the heat radiation fins f when viewed from the front from the side where the three identical electric fans 2 are arranged.

[0057] FIG. 7(a) is a view when the cooling device 1 including the heat sink 3 and the electric fan 2 for cooling a long light source (not shown) is viewed from the front from the electric fan 2 side, and FIG. 7(b) shows a side view of the cooling device 1 shown in FIG. 7(a).

[0058] In the cooling device 1 shown in FIGS. 7(a) and 7(b), a plurality of electric fans 2 are installed by fixing them with bolts or the like using the fixing portion s provided at the corner of the rectangular frame r with respect to the flat portion p provided at the end of the heat sink 3.

[0059] FIG. 8(a) is also a view when the cooling device 1 including the heat sink 3 and the electric fan 2 for cooling a long light source (not shown) is viewed from the front from the electric fan 2 side, and FIG. 8(b) shows a side view of the cooling device 1 shown in FIG. 8(a).

[0060] The cooling device 1 shown in FIGS. 8(a) and 8(b) is common to the fixing form of the cooling device 1 shown in FIGS. 7(a) and 7(b) except that the heat sink 3 having a height (depth of the heat radiation fins f) of the heat radiation fins f lower than the height of the flat portion p provided at the end of the heat sink 3 is used to fix the electric fan 2.

[0061] FIG. 9(a) is a front view of a cooling device 1 including a heat sink 3 and an electric fan 2 for cooling a long light source (not shown) as viewed from the side of the electric fan 2, and FIG. 9(b) shows a cross-sectional view taken along line A-A of the cooling device 1 shown in FIG. 9(a).

[0062] The cooling device 1 shown in FIGS. 9(a) and 9(b) is an example in which a heat sink 3 having no flat portion p as shown in FIGS. 7 and 8 at its end is used. In this case, after separately providing a support column b at the end of the heat sink 3, a plurality of electric fans 2 are installed by fixing the electric fan 2 with bolts or the like using a fixing portion s provided at the corner of a rectangular frame r with respect to such a support column b.

[0063] As illustrated in FIGS. 7 to 9, in the cooling device according to the present invention, it is preferable that the electric fan is provided at a corner of a rectangular frame and is fixed to the heat sink at a pair of fixing portions located opposite each other on the diagonal line of the rectangular frame. By fixing the electric fan to the rectangular frame in such a form, the electric fan can be fixed outside the region where the radiation fins are provided, and it is not necessary to separately provide an installation member in the region where the radiation fins are provided or to remove the radiation fins at the installation location of the installation member. Therefore, excellent cooling efficiency can be easily exhibited.

[0064] In the example of the fixing form shown in FIGS. 7 to 9, the arrangement width l of a plurality of radiation fins in a direction orthogonal to the longitudinal direction of the radiation fins f is larger than the diameter D of the rotating blades constituting the electric fan 2, and when viewed from the front in the side where the electric fan 2 is arranged, the electric fan 2 is fixed to the end of the heat sink 3 while being inclined with respect to the longitudinal direction of the radiation fins f. Therefore, the light source can be cooled by blowing air from the gap between the fins f, f toward the light source side or discharging the air heated by the light source from the gap between the fins.

[0065] According to the present invention, a cooling device with space savings and excellent cooling efficiency can be provided.

[0066] Next, the light irradiation device according to the present invention will be described. The light irradiation device according to the present invention has a long light source and the cooling device of the present invention, and the cooling device is arranged such that the main surface of the heat sink on the side opposite to the side where the electric fan is installed faces the long light source.

[0067] FIG. 10 shows a light irradiation device 4 in which a long light source 5 is fixed to the main surface of the heat sink 3 on the side opposite to the side where the electric fan 2 is provided (so as to face the heat sink 3) in a cooling device in which the electric fan 2 is fixed to the heat sink 3 shown in FIG. 7.

[0068] FIG. 10(a) is a front view of a light irradiation device 4 having a long light source 5 and including a heat sink 3 and an electric fan 2 for cooling the long light source 5 when viewed from the side of the electric fan 2. FIG. 10(b) shows a side view of the light irradiation device 4 shown in FIG. 10(a), and FIG. 10(c) is a front view of the light irradiation device 4 shown in FIG. 10(a) when viewed from the side of the long light source 5.

[0069] In the cooling device 1 shown in FIGS. 10(a) to 10(c), a plurality of electric fans 2 are installed by fixing them with bolts or the like using fixing portions s provided at the corners of a rectangular frame r with respect to a flat portion p provided at the end of the heat sink 3.

[0070] In the light irradiation device 4 illustrated in FIG. 10, while irradiating light from the long light source 5 to the left side of FIG. 10(b), by rotating a rotating blade v having a diameter D, air is blown from the gaps between the fins f, f to the light source 5 side over the entire arrangement width l of the plurality of fins f, or the air heated by the light source is discharged from the gaps between the fins, thereby effectively cooling the light source 5.

[0071] As illustrated in FIG. 10, when the light irradiation device according to the present invention includes a cooling device having a plurality of electric fans, all of the electric fans may blow air from the gaps between the fins toward the light source side, or all of the electric fans may discharge the air heated by the light source from the gaps between the fins (to the side where the electric fans are installed), or some of the electric fans may blow air from the gaps between the fins toward the light source side while the other electric fans discharge the air heated by the light source from the gaps between the fins (to the side where the electric fans are installed).

[0072] The light irradiation device according to the present invention may have a housing. As an example of the form of the light irradiation device having a housing, for example, a form can be cited in which an electric fan is fixed to one main surface of a heat sink, a light source is fixed to the opposite main surface, and the fixed objects obtained in a housing that houses these are accommodated.

[0073] According to the present invention, it is possible to provide a light irradiation means having a cooling device that saves space and has excellent cooling efficiency.

Example

[0074] Hereinafter, the present invention will be further described with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples as long as the gist thereof is not exceeded.

[0075] (Examples 1 to 4, Comparative Example 1) <Configuration of Light Irradiation Device> In the following Examples and Comparative Examples, an irradiation test was conducted using a light irradiation device 4 having the form shown in FIG. 11. FIG. 11(a) is a front view of a light irradiation device 4 having a long light source 5 and a cooling device in which two electric fans 2 are fixed to a heat sink 3 for cooling the long light source 5, as viewed from the side where the electric fans 2 are provided. FIG. 11(b) shows a side view of the light irradiation device 4 shown in FIG. 11(a), and FIG. 11(c) is a front view of the light irradiation device 4 shown in FIG. 11(a), as viewed from the side where the long light source 5 is provided. In the following Examples and Comparative Examples, the following were used as the electric fan 2, heat sink 3, and light source 5 that constitute the light irradiation device 4. While irradiating light from the light source 5 to the left side of FIG. 11(b) under the condition of an ambient environmental temperature of 25°C, the electric fans 2 and 2 were driven to blow air toward the light source 5 for cooling treatment, and the temperature T of the light source 5 when the temperature reached saturation (reached a constant temperature) after the start of the cooling treatment was measured. The measurement position of the temperature of the light source 5 was set as the central portion in the longitudinal direction of the light source 5 shown in FIG. 11(c) (the position corresponding to the central portion between the axes of the rotating blades v and v that constitute the two electric fans 2 and 2), which is c. In Examples 1 to 4 and Comparative Example 1, when the two electric fans 2 and 2 shown in FIG. 11(a) were viewed from the front side of the electric fan side, the inclination angle α of the two electric fans 2 and 2 with respect to the longitudinal direction of the radiation fins f and the axial distance a between the rotating blades that constitute the two electric fans 2 and 2 were changed as shown in Table 1. Note that each reference numeral shown below corresponds to the reference numeral attached to FIG. 11.

[0076] <Heat sink> As the heat sink 3, a heat sink in which 11 radiation fins f were arranged in parallel in the longitudinal direction was used. Aluminum was adopted for all the constituent materials of the heat sink including the radiation fins f. (Radiation fin size) Length L1 in the longitudinal direction of the radiation fin: 325 mm Height (depth of the radiation fin) L2 of the radiation fin: 32 mm Thickness L3 of the radiation fin: 5 mm Arrangement width l of the plurality of radiation fins in the direction orthogonal to the longitudinal direction of the radiation fin: 115 mm (Heat sink body size) Thickness L4 of the heat sink: 45 mm Length L5 of the heat sink in the direction orthogonal to the longitudinal direction of the radiation fin f: 175 mm Length L6 of the heat sink in the direction parallel to the longitudinal direction of the radiation fin: 325 mm

[0077] <Electric fan> As the electric fans 2 and 2, 9G1248G101 manufactured by Sanyo Denki Co., Ltd. were both used. Length of one side of the rectangular frame r: 120 mm Thickness of the rectangular frame r: 38 mm Distance between adjacent fixing parts s and s: 104.8 mm Diameter D of the rotating blade v: 113.5 mm Rated voltage: 48 V Rated current: 0.25 A Rated input: 12 W Rated rotational speed: 3600 min -1

[0078] <Light source> As the light source, an ultraviolet irradiation light source with a calorific value of 200 W having a size of 80 mm in width, 320 mm in length, and 1 mm in thickness of the heat generating part was used.

[0079] The temperature T of the light source 5 obtained in the above measurement (the temperature at the central part in the longitudinal direction of the light source 5 (the position corresponding to the central part between the axes of the rotating blades v and v constituting the two electric fans 2 and 2)) is described in Table 1. In addition, the temperature difference ΔT between the temperatures measured in each example and the temperature measured in Comparative Example 1 is also shown in Table 1.

[0080]

Table 1

[0081] From Table 1, it can be seen that in Examples 1 to 4, when viewed from the front in the direction of the electric fan, since the electric fan is arranged at a predetermined inclination angle with respect to the longitudinal direction of the radiation fins, the temperature of the light source 5 can be effectively reduced.

[0082] On the other hand, from Table 1, in Comparative Example 1, when viewed from the front in the direction of the electric fan, the electric fan is arranged parallel to the longitudinal direction of the radiation fins, and installation members such as bolt fixing members and fixing bolts are separately provided in the installation area of the fins, and a part of the fins is deleted. Therefore, it can be seen that the effect of reducing the temperature of the light source 5 is low.

Industrial Applicability

[0083] According to the present invention, it is possible to provide a cooling device with excellent cooling efficiency in a space-saving manner, and it is also possible to provide a light irradiation means having such a cooling device.

Explanation of Reference Numerals

[0084] 1, 11 Cooling device 2, 12 Electric fan 3, 13 Heat sink 4 Light irradiation device 5 Light source v Rotating blade f Radiation fin s Fixed part r Rectangular frame p Flat part l Arrangement width of radiation fins b Support column h Installation member D Diameter of the rotating blade d1 Distance between adjacent fixed parts d2 Length of one side of the rectangular frame

Claims

1. A long heat sink having a plurality of heat dissipation fins arranged in parallel in the longitudinal direction while being spaced apart from each other, and an electric fan in which rotating blades are accommodated within a rectangular frame, the electric fan being arranged in a plurality in the longitudinal direction on the long heat sink, wherein an arrangement width of the plurality of heat dissipation fins in a direction orthogonal to the longitudinal direction of the heat dissipation fins has a length equal to or greater than a diameter of the rotating blades constituting the electric fan, when viewed from the front in the direction of the electric fan, the plurality of electric fans are arranged at the same angle of 20° to 40° with respect to the longitudinal direction of the heat dissipation fins, the rectangular frame of the electric fan is fixed by a stopper, and a fixing position by the stopper is only a flat portion of the heat sink provided outside an arrangement position of the plurality of heat dissipation fins A cooling device characterized by the above.

2. The cooling device according to claim 1, wherein the electric fan is fixed to the heat sink at a pair of fixing portions provided at corners of the rectangular frame constituting the electric fan and positioned opposite to each other on a diagonal line of the rectangular frame.

3. The arrangement width of the plurality of heat dissipation fins satisfies the following formula in relation to a length of one side of the rectangular frame constituting the electric fan.

4. Fixing portions are respectively provided at corners of the rectangular frame constituting the electric fan, a diameter of the rotating blades constituting the electric fan is larger than a distance between adjacent fixing portions of the rectangular frame, and heat dissipation fins of the heat sink are provided over an entire installation region of the rotating blades constituting the electric fan. The cooling device according to any one of claims 1 to 3.

5. A long light source and the cooling device according to any one of claims 1 to 4, and the cooling device is arranged such that a main surface of the heat sink on a side opposite to a side where the electric fan is installed faces the long light source. An optical irradiation device characterized by the above.

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