JP2012033742A - Light irradiation device and printer using light-emitting diode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light irradiation device that can efficiently cool an interior of the device and a printer including the device.SOLUTION: A light irradiation device 1 includes: an LED substrate 6 that mounts an light-emitting diode 30 on one surface; and cooling means 36 that cools the light-emitting diode 30 and the LED substrate 6. The light irradiation device 1 also includes: plural heat dissipation members 32 placed with space to the other surface of the LED substrate 6; and a section member 4 facing each other to the other surface of the LED substrate 6. One end portion of the plural heat dissipation members 32 is placed on the LED substrate 6 and the other end portion contacts to the section member 4. The cooling means 36 includes: plural small duct portions 35 which are made up with the adjacent heat dissipation members 32, the LED substrate 6, and the section member 4; and airflow generation means 31 generating airflow in the plural small duct portions 35.

Description

  The present invention relates to a light irradiation apparatus using a light emitting diode (LED) and a printing apparatus including the light irradiation apparatus. In more detail, it is related with a light irradiation apparatus provided with a cooling structure, and a printing apparatus provided with the same.

  Conventionally, a configuration as shown in FIG. 1 is known as a configuration for cooling a light emitting diode (LED) (see, for example, Patent Document 1). The configuration shown in FIG. 1 includes a light emitting diode 100 that irradiates light, and a cooling unit 101 that is bonded to the back surface of the light emitting diode 100. The light emitting diode 100 generates heat by light emission. The cooling means 101 is composed of a substrate having a plurality of heat dissipating members 102. As such a cooling means 101, a well-known heat sink can be illustrated, for example. The heat radiating member 102 is a thin plate-like member, and a plurality of the heat radiating members 102 are arranged at intervals. According to such a configuration, the heat of the light emitting diode 100 is transmitted to the heat radiating member 102 of the cooling means 101, and the heat radiating member 102 is cooled by the surrounding air, whereby the light emitting diode 100 is cooled.

JP 2008-28377 A

  Incidentally, in the cooling configuration shown in FIG. 1, in order to increase the cooling capacity, the number of the heat radiating members 102 may be increased to increase the contact between the heat radiating members 102 and the surrounding air.

  However, when the number of heat dissipating members 102 is increased, the adjacent heat dissipating members 102 approach each other, so that the gap between the adjacent heat dissipating members 102 becomes narrow, and it is difficult for air to flow through the gap. Thereby, it becomes difficult for fresh air to flow around the heat radiating member 102, and the cooling capacity of the cooling means 101 may be reduced. Further, the resistance to the air passing through the gap may vary depending on the position of the heat dissipation member 102. In such a case, the air flow varies depending on the position, and the cooling effect may vary. Also, the greater the air flow, the greater the difference in cooling effect.

  SUMMARY An advantage of some aspects of the invention is that it provides a light irradiation apparatus capable of efficiently cooling the inside of the apparatus and a printing apparatus including the light irradiation apparatus.

  The present invention is for solving the above-described problems, and is a light irradiation device including an LED substrate on which a light emitting diode (LED) is mounted, and a cooling means for cooling the light emitting diode and the LED substrate, A plurality of heat dissipating members disposed on a surface of the LED substrate different from the mounting surface of the light emitting diodes, and a partition member disposed to face the disposing surface of the heat dissipating member of the LED substrate; The plurality of heat dissipating members have one end portion installed on the LED substrate and the other end portion in contact with the partition member, and the cooling means includes the adjacent heat dissipating member, the LED substrate, and the partition member. A light irradiation apparatus comprising: a plurality of small duct portions configured; and an air flow generating means for generating an air flow in the plurality of small duct portions.

  According to such a configuration, a pressure difference is generated between the inflow portion and the outflow portion of the air due to the operation of the air flow generator, and this pressure difference causes air to flow even in a small duct portion having air resistance. Go. In addition, the air flow speed increases due to the pressure difference, and the air passes through the small duct at a high speed. Therefore, it is possible to always contact the heat radiating member with the low temperature outside air from the inside of the apparatus. Thereby, a cooling effect can be improved and the inside of an apparatus can be cooled efficiently.

  Moreover, in the said light irradiation apparatus, each said heat radiating member and the said division member may be elastically contacting.

  Moreover, the said division member may form the space which accommodates these heat radiating members.

  The partition member may be formed with at least one introduction port through which air can be introduced into the small duct portion.

  The light-emitting diode may be an ultraviolet light-emitting diode that irradiates a substrate with ultraviolet rays.

  Further, the present invention may be a printing apparatus including the light irradiation device described above.

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

It is a figure which shows the conventional cooling structure. 1 is a side view illustrating a schematic configuration of a printing apparatus according to an embodiment of the present invention. 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 (a) top view, (b) side view, (c) bottom view of a light irradiation apparatus. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a perspective view of a division member. It is a figure which expands and shows a part of 2nd space. It is a perspective view of the division member which concerns on other embodiment. It is a figure which shows the measurement location of the temperature in an Example. It is a figure which shows the measurement location of the temperature in an Example. It is a figure which shows the measurement location of the temperature in an Example. It is a figure which shows the dimension in an Example. It is sectional drawing of the light irradiation apparatus which concerns on other embodiment.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 2 is a side view showing a schematic configuration of a printing apparatus according to an embodiment of the present invention, and FIG. 3 is a plan view showing the schematic configuration of the printing apparatus. As shown in FIGS. 2 and 3, the printing apparatus 50 includes a central center drum 51, a plurality of guide rollers 52, and a roll 53 of the printing material P. The center drum 51 is connected to a rotation drive device 55 via a rotation shaft 54, and rotates about the rotation shaft 54 by the operation of the rotation drive device 55. The rotation drive device 55 includes a known electric motor, a rotation belt, and the like (not shown). The guide roller 52 is configured to be rotatable and is disposed around the center drum 51. The roll 53 is obtained by winding a sheet-like printed material P, and the printed material P is sent out from the roll 53. The printing material P is wound around the center drum 51 and the guide roller 52, pulled out from the roll 53 by the rotation of the center drum 51, guided by the guide roller 52, and sent in the arrow X direction.

  The printing apparatus 50 includes a plurality of printing units 56 and ultraviolet irradiation units 57 arranged at intervals along the outer periphery of the center drum 51, and 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 the support frame 58 so as to surround the center drum 51, and is installed so as to be able to print on the printing material P fed by the center drum 51.

  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, and to the substrate P to be fed by the center drum 51. Thus, the ultraviolet light can be irradiated following the printing unit 56.

  FIG. 4 is a perspective view of the ultraviolet irradiation unit. The ultraviolet irradiation unit 57 includes an attachment 59 that is fixed to a support frame 58 (not shown in FIG. 4), and the light irradiation device 1 that is detachably attached to the attachment 59. The attachment 59 includes an attachment main body 60 made of a rectangular cylindrical member, and flanges 61 provided at both axial ends of the attachment main body 60. The attachment main body 60 includes insertion openings 62 formed at both ends in the axial direction, and wall surface openings 63 formed on the wall surface, and the light irradiation device 1 can be inserted through the insertion opening 62. It is configured to be able to irradiate ultraviolet rays through 63. A guide rail 64 for guiding the light irradiation device 1 is installed on the inner surface of the side wall of the attachment main body 60 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.

  5A is a top view, FIG. 5B is a side view, and FIG. 5C is a bottom view. 6 is a cross-sectional view taken along the line AA in FIG. 5, and FIG. 7 is a cross-sectional view taken along the line BB in FIG. In the following description, the up, down, front, back, left, and right directions are directions that are defined for convenience of description, and do not limit the directions in the implementation of the present invention. As shown in FIGS. 5 to 7, the light irradiation device 1 includes a casing 3 having an internal space 2, a plurality of LED substrates 6, a partition member 4, and a control substrate 5 disposed in the internal space 2.

  The casing 3 includes a base portion 7 extending in the horizontal direction and a cover member 8 fixed to the base portion 7 so as to cover the base portion 7, and the internal space 2 is defined by a region surrounded by the base portion 7 and the cover member 8. Is formed. An irradiation opening 9 is formed in the central portion of the base 7, and this irradiation opening 9 penetrates in the thickness direction of the base 7 (vertical direction in FIG. 7), and the longitudinal direction of the casing 3 (FIG. 6). In the left-right direction). In addition, a pair of installation grooves 13 and 13 and installation end surfaces 11 and 11 are formed in the lower portion of the base portion 7 by cutting the base portion 7 in multiple stages. A plate-shaped antifouling plate 12 is installed in the pair of installation grooves 13 and 13. A pair of reflector members 10 and 10 are installed on the pair of installation end faces 11 and 11.

  The dirt prevention plate 12 is made of a plate-shaped transparent member, and is inserted into the pair of installation grooves 13 and 13 to cover the irradiation opening 9. As a material of the anti-stain plate 12, for example, quartz glass that transmits ultraviolet rays can be used. The anti-smudge plate 12 is positioned in the wall surface opening 63 of the attachment 59 and is disposed opposite to the printing material P at the time of ultraviolet irradiation.

  The reflector member 10 is configured by bending a metal plate at a substantially right angle, and includes an outer reflection portion 15 that abuts the installation end surface 11 and an inner reflection portion 16 that is bent and extends from the outer reflection portion 15. Yes. 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, the pair of reflector members 10 and 10 are arranged such that the outer reflection portion 15 faces the outside of the casing 3 and can reflect ultraviolet rays to the outside of the casing 3. The reflector members 10 and 10 are disposed so that the inner reflection portions 16 and 16 are located in the irradiation opening 9 and face each other with the irradiation opening 9 in between, and face the inner side of the irradiation opening 9. It is arranged so that it can reflect ultraviolet rays.

  The cover member 8 has a box shape and covers the upper portion of the base portion 7. A plurality of vent holes 18 are formed in the 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. The ventilation holes 18 are opened in a lattice shape, and 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 light irradiation device 1 is attached to the attachment 59 by rotating the attachment / detachment roller 19 along the guide rail 64 of 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 (left-right direction in FIG. 6).

  The LED substrate 6 is made of a flat plate member made of aluminum, and a plurality of ultraviolet light emitting diodes (LEDs) 30 are mounted on one surface (lower surface), and the ultraviolet light emitting diodes 30 are positioned in the irradiation opening 9. It is fixed to the base 7. The ultraviolet light emitting diode 30 is configured to irradiate the outside of the casing 3 (printed material P) through the irradiation opening 9 with ultraviolet rays. The LED substrate 6 generates heat by the light emitted from the ultraviolet light emitting diode 30.

  The sorting member 4 is configured by bending a metal plate-like member, and an end portion thereof is fixed to the base portion 7. 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 communicates with the outside of the casing 3 through the vent hole 18 of the cover member 8. . In addition, the partition member 4 is disposed so as to face the LED substrate 6 and covers the upper side of the LED substrate 6, whereby a second space 22 through which air flows between the LED substrate 6 and the partition member 4 is formed. Is formed. In the second space 22, a plurality of heat dissipating members 32 are stood up and accommodated at intervals in the horizontal direction.

  FIG. 8 is a perspective view of the dividing member. 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 plurality of communication ports 23 are formed at one end in the longitudinal direction of the side plate portion 26, and the first space 21 and the second space 22 communicate with each other via the communication ports 23.

  Further, an exhaust port member 27 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 sorting member 4, whereby an exhaust port 28 that is expanded is formed and connected to the second space 22. An airflow generator 31 is disposed at the outlet of the exhaust port 28. In addition, a substrate support 24 for fixing the control substrate 5 is installed above the sorting member 4 and the exhaust port member 27.

  The heat dissipating member 32 is formed of a curved metal thin plate (formed in a fin shape), and a plurality of the heat dissipating members 32 are provided in the second space 22 at intervals in the width direction of the casing 3. Moreover, the heat radiating member 32 is extended in the longitudinal direction (left-right direction of FIG. 7) of the casing 3, and two or more are arrange | positioned at intervals also in the longitudinal direction.

  FIG. 9 is an enlarged view showing a part of the second space. As shown in FIG. 9, the heat radiating member 32 is arranged in a standing state on the other surface of the LED substrate 6 (that is, a surface different from the surface on which the ultraviolet light emitting diode 30 is mounted), and has one end (lower end). Is installed on the upper surface of the LED substrate 6, and the other end (upper end) is in contact with the lower surface of the sorting member 4. Thereby, a small duct portion 35 is formed by the adjacent heat dissipating members 32, 32, the LED substrate 6, and the partition member 4, and in a narrow region (inside the small duct portion 35) surrounded by these, A narrow flow path 33 through which air can pass is formed. A plurality of small duct portions 35 are arranged in the width direction of the casing 3. Further, since the heat dissipation 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. .

  As the air flow generator 31, a known blower that pumps air can be used. By the operation of the air flow generator 31, air outside the casing 3 is sucked into the casing 3 through the vent 18. Thus, an air flow is generated in the internal space 2 (the first space 21 and the second space 22). Further, the air flow generator 31 operates to discharge the air in the internal space 2 to the outside of the casing 3 through the exhaust port. Further, when the air generated from the air flow generator 31 passes through the second space 22, the air flows through the inside of the small duct portion 35 (narrow channel 33). It is preferable that high-pressure air can flow at a high speed. Further, in the present embodiment, the air flow generator 31 and the small duct portion 35 constitute a cooling means 36 for cooling the ultraviolet light emitting diode 30 and the LED substrate 6.

  The control board 5 is fixed to the board support 24 and is located in the first space 21. The control board 5 is mounted with a circuit and controls the operation of the ultraviolet light emitting diode 30 and the airflow generator 31. Further, the control board 5 generates heat when activated.

  Next, the operation of the light irradiation device 1 configured as described above will be described. First, in a state where the light irradiation device 1 is attached to the attachment 59, a power supply (not shown) is turned on to cause the ultraviolet light emitting diode 30 to emit light and to activate the air flow generator 31. The printed material P is irradiated with ultraviolet rays by the light emission of the ultraviolet light emitting diodes 30. Further, by the operation of the air flow generator 31, the air outside the casing 3 is introduced into the first space 21 through the vent 18, passes through the first space 21, and then passes through the communication port 23 to the second space. 22 is introduced. Thus, an air flow is generated in the second space 22. At this time, the air introduced into the second space 22 passes through the inside of the small duct portion 35 (the narrow channel 33). Thereafter, the air passes through the exhaust port 28 and the airflow generator 31 and is discharged to the outside.

  According to such a light irradiation device 1, a pressure difference is generated between the inflow portion and the outflow portion of the air by the operation of the air flow generation device 31, and the air flows through the small duct portion 35 due to this pressure difference. At this time, the small duct portion 35 has air resistance, but air flows smoothly due to the pressure difference. Moreover, since an air flow can be made to flow at high speed by this, the low temperature external air can always be sent to the small duct part 35 from the inside of an apparatus. As a result, the heat radiation member 32 can always be brought into contact with outside air having a lower temperature than the inside of the apparatus, so that the cooling effect can be enhanced and the inside of the apparatus can be efficiently cooled.

  Moreover, since the heat radiating member 32 is made 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.

  In addition, since the second space 22 is formed by the partition member 4 and the heat radiating member 32 is accommodated in the second space 22, the heat radiating member 32 is cooled by the air flowing into the second space 22, and the small space 22 is small. The LED board 6 can be cooled by air flowing through the duct portion 35. Thereby, since cooling can be performed in multiple ways, the cooling effect can be further enhanced.

  In addition, according to the present invention, by securing a sufficient air (refrigerant) flow rate over the entire surface of the heat radiating member 32 while ensuring an area necessary for cooling the heat radiating member 32, a high cooling effect can be achieved while being air cooled. Can be created.

  Moreover, in the said light irradiation apparatus 1, it is preferable to narrow the distance of the side-plate part 26 of the division member 4, and the thermal radiation member 32. FIG. Thereby, the space between the side plate part 26 and the heat radiating member 32 becomes small, and the air which flows into the said space decreases. As a result, air easily flows into the small duct portion 35, and the cooling effect can be enhanced.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect of this invention is not limited to the said 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. Even with such a shape, the heat radiating member 32 can be in close contact with the LED substrate 6 and the sorting member 4 to form the small duct portion 35 and the narrow channel 33.

  FIG. 10 is a perspective view of a sorting member according to another embodiment. As shown in FIG. 10, a plurality of inlets 34 for introducing air into the narrow channel 33 can be formed in the upper plate portion 25 of the sorting member 4. According to such a configuration, it is possible to introduce low-temperature outside air into the narrow flow path 33 through the introduction port 34 in the middle of the second space 22, so that the cooling effect can be further enhanced. Moreover, the number of the inlets 34 is not specifically limited, What is necessary is just to form at least one.

  The material of the LED substrate 6 is not particularly limited, and the ultraviolet light emitting diode 30 can be more efficiently cooled by using a material having high thermal conductivity. 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. FIG. 15 is a cross-sectional view of a light irradiation apparatus according to another embodiment. As shown in FIG. 15, in this embodiment, the partition member 4 is made of a flat plate-like member, and is disposed so that one surface (lower surface) is in contact with one end (upper end) portion of the heat dissipation member 32. Also with such a configuration, the small duct portion 35 can be formed by the adjacent heat radiating member 32, the LED substrate 6, and the sorting member 4, and the narrow flow path 33 can be formed inside the small duct portion 35. Moreover, the structure which forms the small duct part 35 is not limited to this structure, The structure which obstruct | occludes the upper direction of the adjacent thermal radiation member 32, and forms the small duct part 35 can be used suitably.

  Moreover, in the said embodiment, although the ultraviolet light emitting diode 30 which irradiates an ultraviolet-ray was used, it is not limited to this structure, It replaces with the ultraviolet light emitting diode 30, and can also use the light emitting diode which emits the light of another wavelength range. it can. For example, a light emitting diode that emits visible light can be used instead of the ultraviolet light emitting diode 30.

  Moreover, in the said embodiment, as shown in FIG. 7, all the several heat radiating members 32 arranged in parallel were the structures which an upper end part contacts the division member 4, However, 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. 7) are in contact with the partition member 4, and the other part (for example, A plurality of heat radiating members 32) on the right half from the center of FIG. 7 may not be in contact with the dividing 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. 7). A plurality of small duct portions 35 can be formed.

  Moreover, in the light irradiation apparatus 1 which concerns on this invention, when the dimension of the longitudinal direction (left-right direction of FIG. 6) of the casing 3 is long, each component member arrange | positioned inside the casing 3 is arranged in parallel with a longitudinal direction. A plurality of them may be arranged. That is, a plurality of the partition members 4, the airflow generators 31, and the like can be arranged in parallel in the longitudinal direction inside the casing 3. Even with such a configuration, the inside of the light irradiation apparatus 1 can be cooled by the constituent members arranged in parallel.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to this embodiment.

  In Examples 1 and 2, the temperature inside the apparatus was measured using the light irradiation apparatus according to the present invention. 11, FIG. 12 and FIG. 13 are diagrams showing temperature measurement points in the examples. As shown in FIGS. 11, 12, and 13, in the first and second embodiments, the temperature measurement points are near the ultraviolet light emitting diode 30 on one surface of the LED substrate 6 (C1 to C8), It was set as the vicinity (D1-D4) of the thermal radiation member 32 in the other side, and the front-end | tip part (E1-E4) of the thermal radiation member 32. FIG. In Examples 1 and 2, the temperature was measured with the cover member 8, the substrate support base, and the control substrate 5 not directly related to the measurement location removed, in order to measure only the measurement location.

  In the first embodiment, the introduction port 34 is not formed in the upper plate portion 25 of the sorting member 4, but in the second embodiment, the introduction port 34 is formed in the upper plate portion 25.

  At the time of temperature measurement, a thermocouple was attached to the measurement location (C, D, E), and the temperature at the measurement location was measured with a temperature measuring instrument connected to this thermocouple. Further, the current value of the power supply controller was set to 600 mA, and the ultraviolet light emitting diode 30 was energized. When the temperature at the measurement location was stabilized, the energization was stopped, and the subsequent temperature was taken as the measured value. Moreover, the maximum flow velocity of the air flow by the air flow generator 31 was 17.2 m / s.

Moreover, the specific structure in an Example is as follows. Moreover, the dimension of each structure in an Example is shown in FIG.
UV light emitting diode 30: Nichia Corporation NC4U134E 4chip 385nm
Heat dissipation member 32: NA0090721 (6 pieces) Arranged at 2mm pitch 4chip (4 pieces)
Airflow generator 31: Sanyo Denki Co., Ltd. axial fan 9GV0612G1D01 DC12V 2.8A
Power controller: Tokyo Drawing Co., Ltd. temperature measuring instrument: OMRON Co., Ltd. portable multi-logger ZR-RX40
Thermocouple: TT-K-36-SLE (ROHS) manufactured by OMEGA ER (USA)
Table 1 shows the temperature measurement results of the examples.

  As shown in Table 1, in Example 1, the maximum temperature near the ultraviolet light emitting diode 30 was 71.1 ° C. (C7), and in Example 2, the maximum temperature near the ultraviolet light emitting diode 30 was 56.1. (C8).

  On the other hand, when the temperature of the LED substrate 6 on which the ultraviolet light emitting diode 30 is mounted is measured without the configuration according to the present invention, the temperature is 130 ° C. at the center of the ultraviolet light emitting diode 30 and 88 near the ultraviolet light emitting diode 30. It was 4 ° C.

  From the above, it was confirmed that according to Examples 1 and 2, the inside of the apparatus can be efficiently cooled. Moreover, according to Example 2, it has confirmed that the cooling effect was higher.

P Printed material 1 Light irradiation device 2 Internal space 3 Casing 4 Division member 5 Control board 6 LED board 7 Base 8 Cover member 9 Irradiation opening 10 Reflector member 11 Installation end face 12 Dirt prevention plate 13 Installation groove 15 Outer reflection part 16 Internal reflection Part 18 Ventilation hole 19 Detachable roller 20 Handle 21 First space 22 Second space 23 Communication port 24 Substrate support base 25 Upper plate part 26 Side plate part 27 Exhaust port member 28 Exhaust port 30 Ultraviolet light emitting diode 31 Air flow generator 32 Heat radiation member 33 Narrow channel 34 Inlet 35 Small duct portion 36 Cooling means 50 Printing device 51 Center drum 52 Guide roller 53 Roll 54 Rotating shaft 55 Rotation driving device 56 Printing unit 57 Ultraviolet irradiation unit 58 Support frame 59 Attachment 60 Attachment body 61 Flange 6 Insertion opening 63 wall opening 64 guide rail

On the other hand, when the temperature of the LED substrate 6 on which the ultraviolet light emitting diode 30 is mounted is measured without the configuration according to the present invention, the temperature is 130 ° C. at the center of the ultraviolet light emitting diode 30 and 88 near the ultraviolet light emitting diode 30. It was 4 ° C. The vicinity of the ultraviolet light emitting diode 30 corresponds to the measurement location C in the above example, and the temperature dropped from 88.4 ° C. to 71.1 ° C. or 56.1 ° C. according to the present invention.

From the above, it was confirmed that according to Examples 1 and 2, the inside of the apparatus can be efficiently cooled. Moreover, according to Example 2, it has confirmed that the cooling effect was higher. Therefore, the effect of the temperature reduction by the air cooling of this invention has been confirmed.

Claims (6)

An LED substrate mounted with a light emitting diode;
A light irradiation device comprising: a cooling means for cooling the light emitting diode and the LED substrate,
A plurality of heat dissipating members arranged at intervals on a surface different from the light emitting diode mounting surface of the LED substrate;
A partition member disposed opposite to the disposing surface of the heat dissipation member of the LED substrate;
The plurality of heat dissipating members, one end is installed on the LED substrate, the other end is in contact with the partition member,
The cooling means includes a plurality of small duct portions constituted by the adjacent heat radiating member, the LED substrate, and the sorting member, and an air flow generating means for generating an air flow in the plurality of small duct portions. The light irradiation apparatus characterized by this.   The light irradiation apparatus according to claim 1, wherein each of the heat dissipating members and the dividing member are in elastic contact.   The light irradiation apparatus according to claim 1, wherein the sorting member forms a space for accommodating the plurality of heat radiating members.   The light irradiation apparatus according to claim 1, wherein at least one introduction port through which air can be introduced into the small duct portion is formed in the sorting member.   The light emitting device according to any one of claims 1 to 4, wherein the light emitting diode is an ultraviolet light emitting diode that irradiates a substrate with ultraviolet rays.   A printing apparatus provided with the light irradiation apparatus of Claim 5.

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