JP5773685B2 - Light irradiation module and printing apparatus - Google Patents

Description

  The present invention relates to a light irradiation apparatus and a printing apparatus used for curing an ultraviolet curable resin or a paint.

  2. Description of the Related Art Conventionally, ultraviolet irradiation apparatuses are widely used for the purpose of fluorescence reaction observation in medical and bio fields, sterilization applications, adhesion of electronic components, curing of ultraviolet curable resins and inks, and the like. High pressure mercury lamps are used as lamp light sources for UV irradiation devices used for curing UV curable resins used for bonding small parts in the field of electronic components, etc., and UV curable inks used in the field of printing. And metal halide lamps are used.

  In recent years, reduction of global environmental load is desired on a global scale, so there is an active movement to adopt UV light emitting elements as lamp light sources that can suppress the generation of ozone and heat with relatively long life, energy saving. It has become to.

  However, even when an ultraviolet light emitting element capable of relatively suppressing the generation of heat is used as a lamp light source, heat is generated from the ultraviolet irradiation device by use, and this heat reduces the luminous efficiency of the ultraviolet light emitting element, Problems such as shortening the service life occur. Therefore, as described in Patent Document 1, for example, a device for cooling the ultraviolet irradiation device has been proposed.

  However, since such a device is a complicated and large-sized device that requires a cooling fan to be provided, the ultraviolet light emitting device is relatively efficiently improved by efficiently cooling the ultraviolet light emitting device. Therefore, there has been a demand for a light irradiation device that has a relatively long life and is downsized.

Utility Model Registration No. 3158033

  The present invention has been made in view of the above problems, and by efficiently cooling the ultraviolet light emitting element, the light emitting efficiency of the ultraviolet light emitting element is relatively high, the life of the ultraviolet light emitting element is relatively long, and the size is reduced. An object of the present invention is to provide a light irradiation apparatus.

  The light irradiation module according to the present invention includes a light irradiation device, electric wiring for supplying power to the light irradiation device, a cooling pipe for flowing a coolant used for cooling the light irradiation device, the light irradiation device, A housing for accommodating the electrical wiring and the cooling pipe, and the light irradiation device includes a supply port and a discharge port of a heat radiation channel to which the cooling pipe is connected, and an electrical to which the electrical wiring is connected. The cooling pipe is connected to a first cooling pipe connected to the supply port and the discharge port of the light irradiation device, and an external cooling pipe for supplying and discharging the refrigerant. Second cooling pipes connected to each other, the first cooling pipe and the second cooling pipe being connected to each other on the supply side and the discharge side, respectively, Deba A first space containing the electrical wiring and the first cooling pipe, and a second space containing the second cooling pipe, and the first space and the second space. And are separated by a partition wall.

  Further, the volume of the first cooling pipe is smaller than the volume of the second cooling pipe.

  Further, the partition wall includes a heat insulating material having a thermal conductivity of 0.1 W / (m · K) or less.

  The material of the housing is metal.

  Furthermore, a cooling pipe that uses the refrigerant for cooling the first space is further provided, and the cooling pipe is connected between the cooling pipes on the supply side and the discharge side, and is disposed on the outer periphery of the first space. It is characterized by being arranged along.

  In addition, a conveying unit that conveys a light-transmitting recording medium, a printing unit that prints the ultraviolet curable ink or the ultraviolet curable resin on the recording medium, and irradiates the printed recording medium with light. And a light irradiation module for printing.

  According to the light irradiation module of the present invention, the light irradiation device, the electrical wiring for supplying power to the light irradiation device, the cooling pipe for flowing the coolant used for cooling to the light irradiation device, the light irradiation device, A housing for housing the electrical wiring and the cooling pipe, and the light irradiation device includes a supply port and a discharge port of a heat radiation channel to which the cooling pipe is connected, and the electrical wiring is connected. The cooling pipe includes a first cooling pipe connected to the supply port and the discharge port of the light irradiation device, and an external cooling pipe for supplying and discharging the refrigerant. Each of the first cooling pipe and the second cooling pipe are connected to each other on the supply side and the discharge side, respectively, and Irradiation A first space that accommodates a chair, the electrical wiring, and the first cooling pipe; and a second space that accommodates the second cooling pipe, the first space and the second space. Are partitioned by the partition wall, the light irradiation device can be cooled relatively efficiently. As a result, a light irradiation module with a relatively small illuminance of the light irradiation device and a relatively small illuminance variation is realized.

Fig.1 (a) is a side view of the light irradiation module which concerns on one Embodiment of this invention. FIG.1 (b) is a top view of the light irradiation module which concerns on one Embodiment of this invention. FIG. 2 is a plan view of the light irradiation device shown in FIG. FIG. 3 is a cross-sectional view taken along line 2I-2I in the light irradiation device shown in FIG. FIG. 4 is a plan view of a heat radiating member constituting the light irradiation device shown in FIG. FIG. 5 is an exploded perspective view of the first housing according to the embodiment of the present invention. FIG. 6 is an exploded cross-sectional view of the first housing according to the embodiment of the present invention. FIG. 7 is a top view of a printing apparatus using the light irradiation module shown in FIG. FIG. 8 is a side view of the printing apparatus shown in FIG. FIG. 9 is an exploded cross-sectional view of a first housing of a light irradiation module according to another embodiment of the present invention.

  Hereinafter, the light irradiation module and the printing apparatus of the present invention will be described with reference to the drawings.

(Embodiment of light irradiation module)
A light irradiation module 1 shown in FIG. 1 is incorporated in a printing apparatus such as an offset printing apparatus or an ink jet printing apparatus that uses ultraviolet curable ink, and applies ultraviolet light after depositing the ultraviolet curable ink on an object (recording medium). It functions as an ultraviolet irradiation module that cures ultraviolet curable ink by irradiation.

  The light irradiation module 1 includes a light irradiation device 2, an electric wiring 3 for supplying power to the light irradiation device 2, a cooling pipe 4 for flowing a coolant used for cooling to the light irradiation device 2, a light irradiation device 2, A housing 5 for housing the electrical wiring 3 and the cooling pipe 4 is provided.

  First, the light irradiation device 2 which comprises the light irradiation module 1 is demonstrated using FIG. 2, FIG.

  The light irradiation device 2 functions as an ultraviolet irradiation light source of the light irradiation module 1.

  The light irradiation device 2 is disposed in the base 10 having a plurality of openings 12 on one main surface 11a, a plurality of connection pads 13 provided in the openings 12, and in the openings 12 of the base 10, A plurality of light emitting elements 20 electrically connected to the connection pads 13, a plurality of sealing materials 30 filled in the respective openings 12 and covering the light emitting elements 20, and an adhesive on the other main surface 11 b of the substrate 10 And a heat radiating member 60 bonded through 50.

  The substrate 10 includes a laminated body 40 in which a first insulating layer 41 and a second insulating layer 42 are laminated, an internal electric wiring 70 that connects the light emitting elements 20 to each other, and a light irradiation device that is connected to the internal electric wiring 70. And an electrical connection terminal 71 connected to the electrical wiring 3 for supplying electric power to the electrical connection 2. The electrical connection terminal 71 has a rectangular shape in plan view from the main surface 11 a side, and an opening provided on the upper surface. The light emitting element 20 is supported in the inside.

  The first insulating layer 41 includes, for example, an aluminum oxide sintered body, an aluminum nitride sintered body, a mullite sintered body, ceramics such as glass ceramics, and resins such as epoxy resins and liquid crystal polymers (LCP). , Etc.

  Next, the internal electrical wiring 70 is formed in a predetermined pattern from a conductive material such as tungsten (W), molybdenum (Mo), manganese (Mn), copper (Cu), and the like. It functions as a power supply wiring for supplying current or current from the light emitting element 20.

  Next, in the second insulating layer 42 laminated on the first insulating layer 41, the opening 12 that penetrates the second insulating layer 42 is formed.

  The opening 12 has an inner peripheral surface 14 inclined so that each opening has a larger opening area on the one main surface 11a side of the substrate 10 than the surface on which the light emitting element 20 is mounted. For example, it has a substantially circular shape. The opening shape is not limited to a circle, and may be a substantially rectangular shape.

  Such an opening 12 has a function of reflecting light emitted from the light emitting element 20 upward on the inner peripheral surface 14 to improve light extraction efficiency.

In order to improve the light extraction efficiency, the material of the second insulating layer 42 is a porous ceramic material having a relatively good reflectivity with respect to light in the ultraviolet region, such as an aluminum oxide sintered body, an oxide It is preferable to form a zirconium sintered body and an aluminum nitride sintered body. Further, from the viewpoint of improving the light extraction efficiency, a metal reflection film may be provided on the inner peripheral surface 14 of the opening 12.

  Such openings 12 are arranged vertically and horizontally over the entire main surface 11 a of the base body 10. For example, the light emitting elements 20 can be arranged at a higher density by arranging in a staggered pattern, and the illuminance per unit area can be increased. Here, arranging in a staggered lattice is synonymous with arranging at lattice points of an oblique lattice.

  If sufficient illuminance per unit area can be ensured, it may be arranged in a regular lattice shape or the like, and there is no need to limit the arrangement shape.

  The base 10 provided with the laminate 40 composed of the first insulating layer 41 and the second insulating layer 42 as described above, when the first insulating layer 41 and the second insulating layer 42 are made of ceramics or the like, It is manufactured through the following steps.

  First, a plurality of ceramic green sheets manufactured by a conventionally known method is prepared. A hole corresponding to the opening is formed in the ceramic green sheet corresponding to the opening 12 by a method such as punching. Next, a metal paste to be the internal wiring 60 is printed (not shown) on the green sheet, and then the green sheet is laminated so that the printed metal paste is positioned between the green sheets. Examples of the metal paste that becomes the internal wiring 60 include a paste containing a metal such as tungsten (W), molybdenum (Mo), manganese (Mn), and copper (Cu). Next, the substrate 10 having the internal wiring 60 and the opening 12 can be formed by firing the laminate and firing the green sheet and the metal paste together.

  Moreover, when the 1st insulating layer 41 and the 2nd insulating layer 42 consist of resin, the manufacturing method of the base | substrate 10 can consider the following methods, for example.

  First, a precursor sheet of a thermosetting resin is prepared. Next, a plurality of precursor sheets are laminated so that lead terminals made of a metal material to be the internal wiring 60 are disposed between the precursor sheets and the lead terminals are embedded in the precursor sheets. Examples of the material for forming the lead terminal include metal materials such as Cu, Ag, Al, iron (Fe) -nickel (Ni) -cobalt (Co) alloy, and Fe-Ni alloy. And after forming the hole corresponding to the opening part 12 in a precursor sheet | seat by methods, such as a laser processing and an etching, the base | substrate 10 is completed by thermosetting this.

  On the other hand, in the opening 12 of the base body 10, a connection pad 13 electrically connected to the light emitting element 20 and a bonding material 15 such as solder, gold (Au) wire, aluminum (Al) wire, etc. are connected to the connection pad 13. And the sealing material 30 for sealing the light emitting element 20 are provided.

  The connection pad 13 is formed of a metal layer made of a metal material such as tungsten (W), molybdenum (Mo), manganese (Mn), and copper (Cu). If necessary, a nickel (Ni) layer, a palladium (Pd) layer, a gold (Au) layer, or the like may be further laminated on the metal layer. The connection pad 13 is connected to the light emitting element 20 by a bonding material 15 such as solder, gold (Au) wire, or aluminum (Al) wire.

The light-emitting element 20 includes, for example, a light-emitting diode in which a p-type semiconductor layer and an n-type semiconductor layer made of a semiconductor material such as GaAs or GaN are stacked on an element substrate 21 such as a sapphire substrate, or a semiconductor layer made of an organic material. It is comprised by the organic EL element etc. which consist of.

  The light emitting element 20 is connected to a semiconductor layer 22 having a light emitting layer and a connection pad 13 disposed on the substrate 10 through a bonding material 15 such as solder, gold (Au) wire, aluminum (Al) wire, or the like. Element electrodes 23 and 24 made of a metal material such as Ag are provided, and are wire-bonded to the base 10. The light emitting element 20 emits light having a predetermined wavelength with a predetermined luminance according to the current flowing between the element electrodes 23 and 24, and emits the light to the outside through the element substrate 21. As is well known, the element substrate 21 can be omitted. Further, the connection between the device electrodes 23 and 24 of the light emitting device 20 and the connection pad 13 may be performed by a conventionally known flip connection technique using solder or the like as the bonding material 15.

  In the present embodiment, an LED that emits UV light having a wavelength peak spectrum of light emitted from the light emitting element 20 of, for example, 250 to 395 [nm] or less is employed. That is, in this embodiment, a UV-LED element is employed as the light emitting element 20. The light emitting element 20 is formed by a conventionally known thin film forming technique.

  And this light emitting element 20 is sealed with the sealing material 30 mentioned above.

  The sealing material 30 is formed of an insulating material such as a light-transmitting resin material, and prevents the entry of moisture from the outside by sealing the light emitting element 20 well, or from the outside. The impact is absorbed and the light emitting element 20 is protected.

  The sealing material 30 is a material having a refractive index between the refractive index of the element substrate 21 constituting the light emitting element 20 (in the case of sapphire: 1.7) and the refractive index of air (about 1.0), such as silicone. By being formed of resin (refractive index: about 1.4) or the like, the light extraction efficiency of the light emitting element 20 can be improved.

  The sealing material 30 is formed by mounting the light emitting element 20 on the substrate 10, filling a precursor such as a silicone resin into the opening 12, and curing it.

  The heat dissipating member 60 bonded to the base 10 is bonded to the other main surface 11 of the base 10 via an adhesive 50 such as a silicone resin or an epoxy resin adhered to one main surface, and supports the base 10. At the same time, the heat of the light emitting element 20 stored in the substrate 10 is absorbed, and the absorbed heat is released to the outside. The material for forming the heat radiating member 60 is preferably a material having a high thermal conductivity, and examples thereof include metal materials such as Cu and Al, ceramics, and resin materials. In this embodiment, Cu is adopted as a material for forming the heat dissipation member 60.

  Moreover, as shown in FIG. 4, the heat radiating member 60 has a heat radiating flow path 61 for flowing a refrigerant used for cooling. The heat radiation channel 61 includes a supply port 62 for supplying the refrigerant to the other main surface of the heat radiation member 60 and a discharge port 63 for discharging the refrigerant.

The cooling pipe 4 is connected to the supply port 62 and the discharge port 63. The cooling pipe 4 and the above-described light irradiation device 2 and electrical wiring 3 are accommodated in a housing 5. An opening for connecting the cooling pipe 4 to an external cooling pipe 7 disposed outside the casing 5 is provided on the outer wall of the casing 5, and the cooling pipe 4 and the external cooling pipe 7 are connected through the opening. ing. Then, the refrigerant is supplied to the heat radiating flow path 61 of the heat radiating member 60 through the external cooling pipe 7 and the cooling pipe 4, and the heat radiating member 60 is well cooled by the supplied refrigerant, and as a result, the heat radiating effect of the heat radiating member is obtained. Can be increased. The refrigerant used for cooling the heat radiating member 60 is discharged to the outside through the discharge port 63, the cooling pipe 4 and the external cooling pipe 7. Note that the shape of the heat radiation channel 61 for flowing the refrigerant and the arrangement in the heat radiation member 60 may be any shape as long as the heat generated by the light irradiation device 2 can be efficiently cooled.

  As shown in FIG. 1, the above-described housing 5 includes a first housing 5 a, a second housing 5 b, and a partition wall for partitioning both, and the first housing 5 a The light irradiation device 2, the electrical wiring 3, and the first part of the cooling pipe 4 are accommodated, and the second part of the cooling pipe 4 is accommodated in the second casing 5a. Here, the first portion of the cooling pipe 4 accommodated in the first casing 5a is the first cooling pipe 4a, and the second portion of the cooling pipe 4 accommodated in the second casing 5b is the second. This is called the cooling pipe 4b.

  With such a configuration, heat generated in the first housing 5a, for example, heat generated in the light emitting element 20 and heat generated in the electrical wiring 3 are not easily transmitted to the second housing 5b. The second cooling pipe 4b disposed in the second housing 5b is suppressed from becoming high temperature. As a result, the temperature of the refrigerant supplied from the second cooling pipe 4b to the first cooling pipe 4a can be kept at a relatively low temperature, and consequently the cooling solvent inside the heat dissipation member 60 is kept at a relatively low temperature. be able to. As a result, the light irradiation device 2 can be cooled relatively efficiently, the illuminance of the light emitted from the light irradiation device 2 can be relatively high, and the illuminance variation can be relatively small.

  In addition, even when a failure such as a tear in the second cooling pipe 4b occurs in the second casing 5b, it is possible that the refrigerant leaked from the second cooling pipe 4b flows into the first casing 5a. Therefore, it is possible to prevent the light irradiation device 2 from being electrically short-circuited by the leaked refrigerant.

The first housing 5 a supports the light irradiation device 2 and has a function of accommodating an electric wiring 3 that supplies power to the light irradiation device 2 and a first cooling pipe 4 a that supplies a cooling refrigerant to the light irradiation device 2. And made of a metal material such as aluminum, iron, and stainless steel. First housing 5a
Is not limited to a metal material, but may be a resin or the like, but from the viewpoint of weight reduction, heat dissipation, and corrosion resistance of the light irradiation module 1, in the present embodiment, aluminum is adopted as the material of the first casing 5a.

  As shown in FIGS. 5 and 6, the first housing 5 a includes a first flat plate 101, a second flat plate 102, a first frame 103, and a cover glass 6. An opening 104 is provided at the center of the first flat plate 101, and a cover glass 6 made of quartz or the like is attached so as to cover the opening 104. The light emitted from the light irradiation device 2 is irradiated through the opening 104 through the cover glass 6. In the present embodiment, quartz is used as the material of the cover glass. However, any material other than quartz may be used as long as it has a high ultraviolet transmittance and is less deteriorated by ultraviolet rays. The cover glass 6 has a function of preventing the light irradiation device 2 from being contaminated by scattering of ultraviolet curable ink or the like when the light irradiation module 1 is incorporated into a printing apparatus. If the cover glass is contaminated, maintenance such as cleaning can be performed relatively easily. Therefore, the influence of the contamination on the illuminance degradation of the light emitted from the light irradiation device 2 can be relatively reduced, and the contamination Even if the illuminance deteriorates due to the above, the illuminance can be easily recovered.

  In the present embodiment, the quartz glass and the casing 1a are bonded to each other with an elastic adhesive in consideration of the mismatch in thermal expansion coefficients between the quartz glass and the casing 1a.

  The first flat plate 101 having such an opening 104 is manufactured by a known metal cutting process or a die-casting method.

Further, as shown in FIGS. 5 and 6, a pair of support members 106 for supporting the light irradiation device 2 are provided on a pair of wall surfaces facing each other along the longitudinal direction of the first frame 103. It is attached so as to be parallel to the opening surface of the first frame 103.

  The pair of support members 106 are for supporting both ends of the light irradiation device 2 from below, and are formed in various shapes such as a flat plate shape. It is fixed with an adhesive. The mounting position of the support member 106 in the height direction with respect to the first frame 103 is set to the extent that the light irradiation device 2 and the cover glass 6 do not contact when the light irradiation device 2 is fixed to the support member 106. It is preferable to provide at a close position. This is because the light irradiation device 2 inherently has a focal length at which light emitted from the light irradiation device 2 can be extracted most efficiently. If the distance between the light irradiation device 2 and the cover glass 6 is sufficiently large, the focal length is first. The light emitted from the light irradiation device 2 cannot be efficiently used. Even if the focal length is outside the first housing 5a, the closer to the outer surface of the cover glass 6, the more susceptible to contamination due to scattering of ultraviolet curable ink or the like from the object. . Therefore, by making the light irradiation device 2 and the cover glass 6 as close as possible to each other as much as possible, the light emitted from the light irradiation device 2 can be used relatively effectively, and the light irradiation module 1 can be used as an ultraviolet curable ink from an object. Illumination deterioration of the light irradiation device 2 due to contamination due to scattering or the like can be relatively prevented.

  In this embodiment, the support member 106 is used to attach the light irradiation device 2 to the first housing 5a. However, the light irradiation device 2 is not attached to the first housing 5a without using the support member 106. The light irradiation device 2 may be directly screwed and fixed to the housing 5a by attaching with a direct bonding material or an adhesive, or by providing a through hole for screwing on the wall surface of the first frame 103.

  The second flat plate 102 is provided with a plurality of through-holes 107, and the first cooling pipe 4 a connected to the supply port 62 and the discharge port 63 of the heat radiation channel 61 provided inside the heat radiation member 60. And the second cooling pipe 4b accommodated in the second casing 5b are respectively inserted and connected through a through hole 107.

  The first cooling pipe 4a is formed of a resin tube such as a nylon tube, a urethane tube or a fluororesin tube, or a metal tube such as a copper tube or a stainless steel tube. What is necessary is just to select suitably the material of the 1st cooling piping 4a and the 2nd cooling piping 4b according to the kind of refrigerant | coolant used for cooling of the light irradiation device 2. FIG.

  The first housing 5 a covers the second flat plate 102 so as to cover the other opening surface of the first frame 103 so that the first flat plate 101 covers the one opening surface of the first frame 103. And fixed with screws, a bonding material, an adhesive, or the like. The contact surfaces of the first flat plate 101 and the first frame 103 and the second frame and the first frame 103 are sealed with silicon rubber, nitrile rubber, fluororesin, silicone resin, urethane resin, or the like. By interposing the material, leakage of ultraviolet light from the light irradiation device 2 from the first housing 5a is prevented relatively well, and ultraviolet curable ink or cooling from the outside to the first housing 5a is prevented. Intrusion of the refrigerant can be prevented.

  The wall surface of the first housing 5 a has an external connection terminal 108 for connecting the electrical wiring 3 connected to the electrical connection terminal 71 of the light irradiation device 2 to the external electrical wiring 8. The external connection terminal 108 is provided with an opening in the wall surface of the first housing 5a, and is inserted into the opening with an adhesive or a screw.

  On the other hand, the second casing 5b has a function of accommodating the second cooling pipe, and is formed of various materials such as a metal material such as aluminum, iron, and stainless steel, and a resin, like the first casing 5a. In this embodiment, it is made of aluminum.

  The second cooling pipe 4b is formed of a resin tube such as a nylon tube, a urethane tube or a fluororesin tube, or a metal tube such as a copper tube or a stainless steel tube. What is necessary is just to select suitably the material of the 1st cooling piping 4a and the 2nd cooling piping 4b according to the kind of refrigerant | coolant used for cooling of the light irradiation device 2. FIG.

  The second housing 5b includes a second frame 110, a third flat plate 111, and a second flat plate 102 of the first housing 5a. The second flat plate 102 is shared to configure the first housing 5a and the second housing 5b. The second casing 5 b is configured such that the third flat plate 111 is the other of the second frame 110 such that the second flat plate 102 of the first casing 5 a covers one opening surface of the second frame 110. It is abutted so as to cover the opening surface, and is fixed by screwing, a bonding material, an adhesive or the like. The contact surfaces of the second flat plate 102 and the second frame 110 and the third flat plate 111 and the second frame 110 are made of silicon rubber / nitrile rubber, fluororesin / silicone resin / urethane resin, or the like. Even when water leakage from the second cooling pipe in the second housing 5b occurs, the water is prevented from flowing out of the second housing 5b. In addition, it is possible to prevent contamination of an object or the like relatively well.

  The partition wall that separates the first housing 5a and the second housing 5b is constituted by the second flat plate 102, and the first housing through the through hole 107 provided in the second flat plate 102. Silicon rubber / nitrile rubber, fluororesin / silicone resin / urethane resin so as not to cause a gap between the through-hole 107 and the first cooling pipe 4a so as not to impair the airtightness of 5a and the second housing 5b. It is important to hermetically seal with a sealing material such as.

  The arrangement of the second cooling pipe 4b is not particularly limited, but it is preferable to design the arrangement so that the light irradiation module 1 is miniaturized.

  In the light irradiation module 1 of this embodiment, the volume of the 1st cooling piping 4a is made smaller than the volume of the 2nd cooling piping 4b.

  Since the 1st cooling piping 4a is easy to receive to the influence of the heat which the light irradiation device 2 and the electrical wiring 3 generate | occur | produce, the temperature rise of a cooling refrigerant | coolant can be suppressed by making a volume as small as possible. In the present embodiment, the ratio of the volume of the first cooling pipe 4a and the volume of the second cooling pipe 4b is set to 1: 7.

(Embodiment of printing apparatus)
As an embodiment of the printing apparatus of the present invention, the printing apparatus 200 shown in FIGS. 7 and 8 will be described as an example. The printing apparatus 200 includes a conveyance mechanism 210 for conveying the recording medium 250, an inkjet head 220 as a printing mechanism for printing on the conveyed recording medium 250, and ultraviolet rays for the recording medium 250 after printing. The light irradiation module 1 described above and the control mechanism 230 that controls the light emission of the light irradiation module 1 are provided. Here, the recording medium 250 corresponds to the above-described object.

  The transport mechanism 210 is for transporting the recording medium 250 so as to pass through the inkjet head 220 and the light irradiation module 1 in this order. The transport mechanism 210 and the mounting table 211 are arranged to face each other and are rotatably supported. And a roller 212. The recording medium 250 supported by the mounting table 211 is sent between the pair of transport rollers 212, and the transport roller 212 is rotated to send the recording medium 250 in the transport direction.

The inkjet head 220 has a function of attaching a photosensitive material to the recording medium 250 conveyed via the conveyance mechanism 210. The ink-jet head 220 is configured to eject droplets containing the photosensitive material toward the recording medium 250 and adhere to the recording medium 250. In the present embodiment, ultraviolet curable ink is employed as the photosensitive material. Examples of the photosensitive material include a photosensitive resist and a photocurable resin in addition to the ultraviolet curable ink.

  In the present embodiment, a line-type inkjet head is adopted as the inkjet head 220. The inkjet head 220 has a plurality of ejection holes 220a arranged in a line, and is configured to eject ultraviolet curable ink from the ejection holes 220a. The inkjet head 220 ejects ink from the ejection holes 220a to the recording medium 250 transported in a direction orthogonal to the arrangement of the ejection holes 220a, and deposits the ink on the recording medium, thereby causing the recording medium to adhere to the recording medium. Printing is performed.

  In the present embodiment, a line-type inkjet head has been described as an example of the printing mechanism, but the present invention is not limited to this. For example, a serial-type inkjet head may be employed, A serial type spray head may be employed. Further, as the printing mechanism, an electrostatic head that accumulates static electricity of the recording medium 250 and attaches the photosensitive material with the static electricity may be employed, or the recording medium 250 is immersed in a liquid photosensitive material and the photosensitive medium is used. An immersion apparatus for attaching a conductive material may be employed. Further, a brush, a brush, and a roller may be employed as the printing mechanism.

  In the printing apparatus 200, the light irradiation module 1 has a function of exposing the photosensitive material attached to the recording medium 250 conveyed via the conveyance mechanism 210. The light irradiation module 1 is provided on the downstream side in the transport direction with respect to the inkjet head 220. In the printing apparatus 200, the light emitting element 20 has a function of exposing a photosensitive material attached to the recording medium 250.

  The control mechanism 230 has a function of controlling light emission of the light irradiation module 1. The memory of the control mechanism 230 stores information indicating light characteristics that make it relatively good to cure the ink droplets ejected from the inkjet head 220. Specific examples of the stored information include wavelength distribution characteristics suitable for curing ejected ink droplets, and numerical values representing emission intensity (emission intensity in each wavelength range). In the printing apparatus 200 of the present embodiment, by including the control mechanism 230, the magnitude of the drive current input to the plurality of light emitting elements 20 can be adjusted based on the stored information of the control mechanism 230. Therefore, according to the printing apparatus 200, it is possible to irradiate light with an appropriate amount of light according to the characteristics of the ink used, and it is possible to cure the ink droplets with relatively low energy light.

  In the printing apparatus 200, the transport mechanism 210 transports the recording medium 250 in the transport direction. The inkjet head 220 discharges ultraviolet curable ink to the recording medium 250 being conveyed, and causes the ultraviolet curable ink to adhere to the surface of the recording medium 250. At this time, the ultraviolet curable ink to be attached to the recording medium 250 may be attached to the entire surface, partially attached, or attached in a desired pattern. In the printing apparatus 200, the ultraviolet curable ink attached to the recording medium 250 is irradiated with ultraviolet rays emitted from the light irradiation module 1 to cure the ultraviolet curable ink.

The printing apparatus 200 of this embodiment can enjoy the effects of the light irradiation module 1. In the printing apparatus 200 of the present embodiment, the casing 5 constituting the light irradiation module 1 includes the first casing 5 a that houses a part of the light irradiation device 2, the electrical wiring 3, and the cooling pipe 4, and the cooling pipe 4. And a second casing 5b that accommodates a part of the second casing 5b. And the 1st housing | casing 5a and the 2nd housing | casing 5b are partitioned off by the partition. By adopting such a configuration, heat generated by driving the light irradiation device 2 and heat generated by supplying electric power to the electrical wiring 3 are relatively difficult to be transmitted to the second cooling pipe 4b. Thus, the cooling solvent supplied to the light irradiation device 2 via the first cooling pipe 4a can be kept at a relatively low temperature. As a result, the light irradiation device 2 can be cooled relatively efficiently, the illuminance of the light emitted from the light irradiation device 2 can be relatively high, and the illuminance variation can be relatively small.

  While specific embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.

  For example, in the above-described embodiment, the first flat plate 101 corresponding to the partition wall that separates the first housing 5a and the second housing 5b is formed of aluminum. A heat insulating material may be attached to one main surface on the housing 5a side, the other main surface on the second housing 5b side, or any of them. The thermal conductivity of the heat insulating material is preferably 0.1 W / (m · K) or less. As a heat insulating material, it can form with fiber type heat insulating materials, such as glass wool and rock wool, and foam type heat insulating materials, such as a urethane foam, a phenol foam, a polystyrene foam, etc., for example.

  By setting it as such a structure, propagation to the 2nd housing | casing 5b of the heat which generate | occur | produces from the light irradiation device 2 and the electrical wiring 3 can be suppressed comparatively.

  Moreover, as shown in FIG. 9, you may further provide the cooling pipe 120 which uses a cooling refrigerant for cooling the internal space of the 1st housing | casing 5a. With such a configuration, by cooling the heat generated from the light irradiation device 2 and the electrical wiring 3, even if the heat propagates to the second housing 5b, the propagation heat is relatively low. It is possible to reduce the thermal effect on the second housing 5b.

  The material of the cooling pipe 120 may be a resin tube such as a nylon tube, a urethane tube, and a fluororesin tube, or a metal pipe such as a copper pipe or a stainless steel pipe, as in the first cooling pipe 4a and the second cooling pipe 4b. Good.

  In FIG. 9, the cooling pipe 120 is disposed along the inner wall of the first frame 103 of the first housing 5a. However, the cooling pipe 120 does not have to be along the inner wall of the frame 103, and the inside of the first housing 5a is vertically and horizontally. It may be arranged along the outer wall of the first frame 103 of the first housing 5b. The structure of the first frame 103 may be a jacket structure.

  Furthermore, the embodiment of the printing apparatus 200 is not limited to the above embodiment. For example, a so-called offset printing type printer that rotates a shaft-supported roller and conveys a recording medium along the roller surface may exhibit the same effect.

  In the present embodiment, an example in which the light irradiation module 1 is applied to the printing apparatus 200 using the inkjet head 220 is shown. The light irradiation module 1 cures, for example, a photo-curing resin spin-coated on the surface of the object. It can also be applied to the curing of various types of photo-curing resins such as dedicated devices. Moreover, you may use the light irradiation module 1 for the irradiation light source etc. in an exposure apparatus, for example.

DESCRIPTION OF SYMBOLS 1 Light irradiation module 2 Light irradiation device 3 Electrical wiring 4 Cooling piping 4a 1st cooling piping 4b 2nd cooling piping 5 Case 5a 1st housing 5b 2nd housing 6 Cover glass 7 External cooling piping 8 External Electrical Wiring 10 Base 11a One Main Surface 11b Other Main Surface 12 Opening 13 Connection Pad 14 Inner Peripheral Surface 15 Bonding Material 20 Light Emitting Element 21 Element Substrate 22 Semiconductor Layer 23 and 24 Element Electrode 30 Sealing Material 40 Laminate 41 First Insulating layer 42 Second insulating layer 50 Adhesive 60 Heat radiating member 61 Heat radiating flow path 62 Supply port 63 Discharge port 70 Internal electric wiring 71 Electrical connection terminal 101 First flat plate 102 Second flat plate 103 First frame 104 opening 106 support member 107 through hole 108 external connection terminal 110 second frame 111 third flat plate 120 cooling pipe 200 printing device 210 transport mechanism 211 mounting table 212 Feed roller 220 ink-jet head 220a discharge holes 230 control mechanism 250 recording medium

Claims (7)

A light irradiation device, an electric wiring for supplying electric power to the light irradiation device, a cooling pipe for flowing a coolant used for cooling to the light irradiation device, the light irradiation device, the electric wiring, and the cooling pipe are accommodated With a housing,
The light irradiation device has a supply port and a discharge port of a heat dissipation channel to which the cooling pipe is connected, and an electrical connection terminal to which the electrical wiring is connected,
The cooling pipe includes a first cooling pipe connected to the supply port and the discharge port of the light irradiation device, and a second cooling connected to an external cooling pipe for supplying and discharging the refrigerant, respectively. And the first cooling pipe and the second cooling pipe are connected to each other on the supply side and the discharge side,
The housing includes a first space that houses the light irradiation device, the electrical wiring, and the first cooling pipe, and a second space that houses the second cooling pipe,
The light irradiation module, wherein the first space and the second space are partitioned by a partition wall.   The light irradiation module according to claim 1, wherein the volume of the first cooling pipe is smaller than the volume of the second cooling pipe.   The light irradiation module according to claim 1, wherein the partition wall includes a heat insulating material having a thermal conductivity of 0.1 W / (m · K) or less.   The light irradiation module according to any one of claims 1 to 3, wherein a material of the casing is a metal. A cooling pipe that uses the refrigerant for cooling the first space;
5. The cooling pipe according to claim 1, wherein the cooling pipe is connected between the cooling pipes on the supply side and the discharge side, and is disposed along the outer wall of the first space. The light irradiation module according to 1. A cooling pipe that uses the refrigerant for cooling the first space;
5. The cooling pipe according to claim 1, wherein the cooling pipe is connected between the cooling pipes on the supply side and the discharge side, and is disposed along the inner wall of the first space. The light irradiation module according to 1. A conveying means for conveying a recording medium having optical transparency;
Printing means for printing ultraviolet curable ink or ultraviolet curable resin on the recording medium;
Printing apparatus characterized by having a light irradiation module according to any one of claims 1 to 6 for irradiating light to the printed said recording medium.

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