JP5969296B2 - Light irradiation apparatus and printing apparatus - Google Patents

Description

  The present invention relates to a light irradiation device for irradiating light such as ultraviolet rays used for curing ultraviolet curable resins and paints, and a printing apparatus having the same.

  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. In particular, the UV light source lamp light source used for curing UV curable resin used for bonding small parts in the field of electronic components and UV curable ink used for printing, etc. Mercury lamps and metal halide lamps are used.

  In recent years, there has been a strong desire to reduce the global environmental load on a global scale, and there has been an active movement to adopt an ultraviolet light emitting element that can suppress the generation of ozone and a relatively long life as a lamp light source. Yes.

  However, since the illuminance of the ultraviolet light emitting element is relatively low, for example, as described in Patent Document 1, a device having a plurality of light emitting elements mounted on one substrate is prepared, and the plurality of devices are mounted on a support. The module having the above-described configuration is generally used, thereby ensuring the ultraviolet irradiation energy necessary for curing the ultraviolet curable ink.

  However, depending on the usage environment of the ultraviolet irradiation device and the type of the UV curable ink and the target (recording medium) to which the UV curable ink is applied, the curable property of the UV curable ink or the UV curable ink and the target There was a problem that it was difficult to improve the adhesion.

JP 2008-244165 A

  The present invention has been made in view of the above problems, regardless of the usage environment of the ultraviolet irradiation device and the type of the object (recording medium) to which the ultraviolet curable ink and the ultraviolet curable ink are applied, It is an object of the present invention to provide a light irradiation device and a printing device capable of improving the curability of the ultraviolet curable ink and the adhesion between the ultraviolet curable ink and the object.

The light irradiation device of the present invention is a light irradiation apparatus for irradiating light on an object to which an ultraviolet curable ink or an ultraviolet curable resin is applied by moving in one direction relatively, A first light irradiation device disposed opposite to the surface to which the ultraviolet curable ink or the ultraviolet curable resin is applied, and a non-adhered surface located on the opposite side of the applied surface. A moving direction of the object in the first irradiation region where the light of the first light irradiation device is irradiated onto the adherend surface of the object. The length in the moving direction of the object of the second irradiation region in which the light of the second light irradiation device is irradiated onto the non-adhering surface of the object is longer than the length in the object, Upstream in the direction of movement of the object in the irradiation region of 1 and The end on the flow side is located inside the upstream and downstream ends of the second irradiation region, and the upstream end of the second irradiation region is the ultraviolet curable ink or The ultraviolet curable resin is located on the upstream side of the upstream end of the deposition region where the ultraviolet curable resin is deposited on the deposition surface.

  In the light irradiation device of the present invention, in the above-described configuration, the length in the moving direction between the upstream end of the first irradiation region and the upstream end of the second irradiation region is long. In addition, a length in the moving direction between the downstream end of the first irradiation region and the downstream end of the second irradiation region is longer.

  Furthermore, the light irradiation device of the present invention is characterized in that, in the above configuration, the distance between the second light irradiation device and the object is shorter than the distance between the first light irradiation device and the object. And

  Moreover, the light irradiation device of the present invention is characterized in that, in the above configuration, the energy density of light emitted from the second light irradiation device is lower than the energy density of light emitted from the first light irradiation device. .

  Furthermore, in the light irradiation device of the present invention, in the above configuration, the energy density of light in the region corresponding to the deposition region in the second irradiation region is equal to the energy of light in other regions in the second irradiation region. It is characterized by being lower than the density.

  The printing apparatus according to the present invention includes a printing unit that performs printing on a recording medium, and the light irradiation apparatus according to any one of the above-described present invention that irradiates the printed recording medium with the recording medium as an object. It is characterized by having.

  According to the light irradiation device of the present invention, there is provided a light irradiation apparatus for irradiating light on an object to which the ultraviolet curable ink or the ultraviolet curable resin is applied by moving in one direction relatively, A first light irradiation device disposed opposite to the surface of the UV curable ink or the UV curable resin of the object, and a non-adhesion surface located on the opposite side of the adhesion surface. A second light irradiation device arranged in a first position, and the light of the first light irradiation device is irradiated onto the adherend surface of the object. The length in the moving direction of the object of the second irradiation region where the light of the second light irradiation device is irradiated to the non-adhering surface of the object is longer than the length in the moving direction, The upstream side in the moving direction of the object in the first irradiation region And an end on the downstream side is located inside the upstream and downstream ends of the second irradiation region, and the upstream end of the second irradiation region is the ultraviolet curable ink. Alternatively, the ultraviolet curable resin is positioned on the upstream side of the upstream end of the deposition region where the ultraviolet curable resin is deposited on the deposition surface. For this reason, the curable property of the ultraviolet curable ink or the ultraviolet curable ink can be used regardless of the environment in which the ultraviolet irradiation device is used and the type of the ultraviolet curable ink and the object (recording medium) to which the ultraviolet curable ink is applied. It is possible to obtain a light irradiation device that can improve the adhesion with the object.

It is the schematic which shows an example of the form of the light irradiation apparatus of this invention. It is a schematic diagram which shows the positional relationship of the irradiation area | region of the light irradiation apparatus shown in FIG. 1, and the deposition area | region to which an ultraviolet curable ink is adhered. It is a top view of the light irradiation device 2 which comprises the light irradiation apparatus of FIG. It is sectional drawing along the 3I-3I line | wire of the light irradiation device shown in FIG. It is principal part sectional drawing explaining the state which adhered the member for thermal radiation to the light irradiation device shown in FIG. It is a top view of the printing apparatus using the light irradiation apparatus shown in FIG. It is a side view of the printing apparatus shown in FIG. It is a schematic diagram which shows the positional relationship of the light irradiation area | region of the 1st modification of the light irradiation apparatus shown in FIG. 1, and the deposition area | region to which an ultraviolet curable ink is adhered. It is the schematic which shows the 2nd modification of the light irradiation apparatus shown in FIG. It is the schematic which shows the 3rd modification of the light irradiation apparatus shown in FIG. It is the schematic which shows the 4th modification of the light irradiation apparatus shown in FIG.

  Hereinafter, examples of embodiments of a light irradiation apparatus and a printing apparatus according to the present invention will be described with reference to the drawings. The following examples illustrate the embodiments of the present invention, and the present invention is not limited to the examples of these embodiments.

(Light irradiation device)
The light irradiation apparatus 1 shown in FIG. 1 is incorporated in a printing apparatus such as an offset printing apparatus or an inkjet printing apparatus that uses an ultraviolet curable ink 3 and moves in one direction relatively so that the ultraviolet curable ink 3 is covered. By irradiating the object 4 (recording medium) to be worn with ultraviolet rays, it functions as an ultraviolet ray generating light source for curing the ultraviolet curable ink 3.

  The light irradiation apparatus 1 includes a first light irradiation device 2A disposed opposite to the surface 4a to which the ultraviolet curable ink 3 of the object 4 is applied, and a non-adhesion surface located on the opposite side of the surface 4a. And a second light irradiation device 2B arranged to face 4b.

  FIG. 2 shows the positional relationship between the irradiation regions of the first and second light irradiation devices 2A and 2B, which will be described below, and the deposition region where the ultraviolet curable ink 3 is deposited. This is shown schematically from the side.

Than the first length L _A in the first movement direction of the object 4 in the irradiated region 2Aa which light of the light emitting device 2A are irradiated to the deposition surface 4a of the object 4, the second light irradiation the length L _B in the moving direction of the object 4 of the second irradiation region 2Bb light device 2B is irradiated to the non adherend surface 4b of the object 4 is longer. Further, the upstream and downstream ends of the first irradiation region 2Aa in the moving direction of the object 4 are located inside the upstream and downstream ends of the second irradiation region 2Bb, and The upstream end of the second irradiation region 2Bb is located upstream of the upstream end of the deposition region 3a where the ultraviolet curable ink 3 is deposited on the deposition surface 4a. That is, from the upstream side in the moving direction of the object 4, the upstream end of the second irradiation region 2Bb, the upstream end of the deposition region 3a, the upstream end of the first irradiation region 2Aa, They are positioned in the order of the downstream end of the first irradiation region 2Aa and the downstream end of the second irradiation region 2Bb.

  In this example, the center of the first irradiation region 2Aa in the moving direction of the object 4 and the center of the second irradiation region 2Bb in the moving direction of the object 4 coincide. That is, the length in the moving direction of the object 4 between the upstream end of the first irradiation region and the upstream of the second irradiation region, the downstream end of the first irradiation region, and the second The length in the moving direction of the object 4 between the irradiation area and the downstream side is substantially the same.

  Here, the deposition region 3a is a region where the ultraviolet curable ink 3 is deposited by the printing means 220 described later. For example, in the case where the printing unit 220 is an inkjet head that discharges the ultraviolet curable ink 3, it is the maximum area where the ultraviolet curable ink 3 can be applied to the stationary object 4. In the case of an offset printing machine in which the printing unit 220 transfers the ultraviolet curable ink 3 deposited on the roller surface to the object 4, the object 4 and the roller coated with the ultraviolet curable ink 3 come into contact with each other. It is a contact area.

  In this example, the widths of the first irradiation region 2Aa and the second irradiation region 2Bb in the direction orthogonal to the moving direction of the object 4 are substantially equal. And the width | variety of the deposition area | region 3a is narrower than the width | variety of the direction orthogonal to the moving direction of the target object 4 of 1st and 2nd irradiation area | region 2Aa and 2Bb. The reason why the width of the deposition region 3a is narrow is that the energy density of light tends to be lower at the outer periphery of the irradiation region where light is irradiated onto the object 4 than at the inner periphery. This is because a predetermined light energy density can be obtained in the width direction of the object 4. Here, the change in the energy density of light in the moving direction of the object 4 does not matter. This is because the ultraviolet curable ink 3 attached to the object 4 passes through the outer periphery of the light irradiation region where the light energy density is low, and the light irradiation region in which the predetermined energy density of the light is always ensured. This is to pass through the inner circumference.

As described above, than the length L _A in the moving direction of the object 4 of the first irradiation region 2Aa, light of the second light emitting device 2B is irradiated to the non adherend surface 4b of the object 4 that the length L _B in the moving direction of the object 4 of the second irradiation region 2Bb are longer, the ends of the upstream and downstream in the moving direction of the object 4 of the first irradiation region 2Aa is first Since the ultraviolet curable ink 3 is cured by the first light irradiation device 2A, it is attached to the object 4 because it is located inside the upstream and downstream ends of the second irradiation region 2Bb. Since the ultraviolet light can be irradiated to the ultraviolet curable ink 3 by the second light irradiation device 2B from the non-adhering surface 4b side, the light irradiation that can sufficiently cure the ultraviolet curable ink 3 is performed. The device 1 can be obtained. Since ultraviolet rays are irradiated from the non-adhering surface 4b side, the object 4 is preferably a light transmissive material. The light-transmitting material is not limited to a transparent material such as a plastic film or a translucent material, and may be any material that transmits light. Since the light in this example is ultraviolet light, any material that transmits ultraviolet light may be used.

  In addition, since the upstream end of the second light irradiation region 2Bb is located on the upstream side of the upstream end of the deposition region 3a, the ultraviolet curable ink 3 before the deposition is applied. Since it becomes possible to irradiate the object 4 with ultraviolet rays and the temperature of the object 4 can be increased, the surface free energy of the object 4 is improved in the adhesion between the ultraviolet curable ink 3 and the object 4. A state suitable for improvement can be obtained. That is, the ultraviolet curable ink 3 and the ultraviolet curable ink 3 are attached regardless of the use environment of the light irradiation device 1 and the kind of the object 4 to which the ultraviolet curable ink 3 or the ultraviolet curable ink 3 is applied. It can be set as the light irradiation apparatus 1 which can implement | achieve high adhesiveness with the target object 4 to be performed.

  Next, the light irradiation devices 2A and 2B constituting the light irradiation apparatus 1 will be described with reference to FIGS.

  The light irradiation device 2 </ b> A, 2 </ b> B includes a substrate 10 having a plurality of openings 12 on one principal surface 11 a, a plurality of connection pads 13 provided in each opening 12, and each opening 12 in the base 10. A plurality of light emitting elements 20 arranged and electrically connected to the connection pads 13, and a plurality of sealing materials 30 filled in the respective openings 12 and covering the light emitting elements 20 are provided.

  The base 10 includes a laminated body 40 in which a first insulating layer 41 and a second insulating layer 42 are laminated, and an electrical wiring 50 that connects the light emitting elements 20 to each other. The light emitting element 20 is supported in an opening 12 provided on the one main surface 11a.

The first insulating layer 41 is made of, for example, a ceramic such as an aluminum oxide sintered body, an aluminum nitride sintered body, a mullite sintered body, and a glass ceramic, and a resin such as an epoxy resin and a liquid crystal polymer (LCP). It is formed.

  The electric wiring 50 is formed in a predetermined pattern by a conductive material such as tungsten (W), molybdenum (Mo), manganese (Mn), and copper (Cu), and the electric current to the light emitting element 20 or the light emitting element It functions as a power supply wiring for supplying current from 20.

  In the second insulating layer 42 stacked on the first insulating layer 41, an opening 12 that penetrates the second insulating layer 42 is formed.

  The shape of each opening 12 is such that the inner peripheral surface 14 is inclined so that the hole diameter is larger on the one main surface 11a side of the substrate 10 than the mounting surface of the light emitting element 20, It has a circular shape. The opening shape is not limited to a circular shape, and may be a 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 are arranged in a zigzag pattern, that is, arranged in a zigzag manner in a plurality of rows. By arranging such an arrangement, the light emitting elements 20 can be arranged with higher density, and the illuminance per unit area Can be increased. Here, to arrange in a zigzag pattern is synonymous with the arrangement so as to be positioned at the lattice points of the diagonal lattice.

  In addition, when 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 is a case where the first insulating layer 41 and the second insulating layer 42 are made of ceramics or the like. If there is, it is manufactured through the following steps.

  First, a plurality of ceramic green sheets manufactured by a conventionally known method are 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 electric wiring 50 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 used for the electric wiring 50 include a paste containing a metal such as tungsten (W), molybdenum (Mo), manganese (Mn), and copper (Cu). Next, the base body 10 having the electrical wiring 50 and the opening 12 can be formed by firing the laminate and firing the green sheet and the metal paste together.

  Further, if the first insulating layer 41 and the second insulating layer 42 are made of a resin, for example, the following method can be considered as a method for manufacturing the substrate 10.

  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 electrical wiring 50 are arranged between the precursor sheets and the lead terminals are embedded in the precursor sheets. Examples of the material for forming the lead terminal include copper (Cu), silver (Ag), aluminum (Al), iron (Fe) -nickel (Ni) -cobalt (Co) alloy, and iron (Fe) -nickel (Ni ) Metal materials such as alloys can be mentioned. 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. In addition, when forming the opening part 12 by laser processing, you may process after thermosetting a precursor sheet | seat.

  On the other hand, in the opening 12 of the substrate 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 is a light emitting element in which a p-type semiconductor layer and an n-type semiconductor layer made of a semiconductor material such as gallium arsenide (GaAs) or gallium nitride (GaN) are stacked on an element substrate 21 such as a sapphire substrate. A diode or a semiconductor layer is composed of an organic EL element made of an organic material.

  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. And device electrodes 23 and 24 made of a metal material such as silver (Ag), 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. As is well known, the element substrate 21 can be omitted. Further, the connection between the element electrodes 23 and 24 of the light emitting element 20 and the connection pad 13 may be performed by a conventionally known flip chip connection technique using solder or the like as the bonding material 15.

  In this example, an LED that emits UV light whose wavelength peak of light emitted from the light emitting element 20 is 280 to 440 [nm] or less is employed. That is, in this example, a UV-LED element is adopted 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 made of an insulating material such as a light-transmitting resin material. By sealing the light-emitting element 20 well, entry of moisture from the outside can be prevented, or from the outside. The light emitting element 20 is protected by absorbing an impact.

  Further, 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) is used as the sealing material 30, for example By using a silicone 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.

  Although the common part of light irradiation device 2A, 2B was demonstrated so far, the difference between the 1st light irradiation device 2A and the 2nd light irradiation device 2B is the light irradiation device 2 in the moving direction of the target object 4. It is the length, and the number, arrangement density, wavelength of emitted light, and the like of the light emitting elements 20 arranged in the light irradiation device 2 may be appropriately adjusted as necessary. For example, it is preferable to use a relatively long wavelength of 370 nm or more and 440 nm or less as the wavelength of light emitted from the second light irradiation device because the degree of light transmission to the object 4 increases. If the wavelength of the light emitted from the first light irradiation device 2A is, for example, 280 nm or more and less than 370 nm, the surface of the ultraviolet curable ink 3 can be cured in a short time. If the photopolymerization reaction is less susceptible to oxygen inhibition, and the thickness is 370 nm or more and 440 nm or less, the degree of light transmission into the ultraviolet curable ink 3 increases. Even if it is thick, it can be cured sufficiently, so that it may be adjusted as needed. The wavelengths of light emitted by the first light irradiation devices 2A and 2B do not have to be a single wavelength, and a plurality of wavelengths may be mixed.

  Note that the light irradiation devices 2A and 2B of this example do not have a heat dissipation member in particular, but as shown in FIG. 5, the other main surface 11b opposite to the one main surface 11a of the base 10 has a silicone resin or the like. The heat radiating member 110 may be bonded through an adhesive 120 such as an epoxy resin. The material for forming the heat radiating member 110 is preferably a material having a high thermal conductivity, such as various metal materials, ceramics, and resin materials. By setting it as such a structure, the heat | fever generate | occur | produced by the drive of the several light emitting element 20 can be thermally radiated from light irradiation device 2A, 2B effectively.

(Embodiment of printing apparatus)
As an example of the embodiment of the printing apparatus of the present invention, the printing apparatus 200 shown in FIGS. 6 and 7 will be described as an example. The printing apparatus 200 includes a transport unit 210 for transporting the recording medium 250, a printing unit 220 as a printing mechanism for printing on the transported recording medium 250, and ultraviolet rays for the recording medium 250 before and after printing. The light irradiation device 1 described above and the control mechanism 230 that controls the light emission of the light irradiation device 1 are provided. The recording medium 250 corresponds to the above-described object 4.

  The transport unit 210 is for transporting the recording medium 250 so as to pass through the light irradiation device 2B, the printing unit 220, and the light irradiation device 2A in this order, and is disposed opposite to the mounting table 211 and rotatably supported. And a pair of transport rollers 212. The transport unit 210 is for sending the recording medium 250 supported by the mounting table 211 between the pair of transport rollers 212 and rotating the transport roller 212 to feed the recording medium 250 in the transport direction. .

  The printing unit 220 has a function of depositing a photosensitive material on the recording medium 250 conveyed via the conveying unit 210. The printing unit 220 is configured to eject droplets containing the photosensitive material toward the recording medium 250 and attach the droplets to the recording medium 250. In this example, ultraviolet curable ink 3 is used as the photosensitive material. As this photosensitive material, in addition to the ultraviolet curable ink 3, for example, a photosensitive resist or a photocurable resin can be used.

In this example, a line-type printing unit is employed as the printing unit 220. The printing unit 220 has a plurality of discharge holes 220a arranged in a line, and the discharge holes 220a.
The ultraviolet curable ink 3 is discharged from the nozzle. The printing unit 220 ejects the ultraviolet curable ink 3 from the ejection holes 220a to the recording medium 250 conveyed in the direction orthogonal to the arrangement of the ejection holes 220a, and the ultraviolet curable ink 3 is ejected to the recording medium 250. By making it adhere, printing is performed on the recording medium 250.

  In this example, the line-type printing unit is exemplified as the printing mechanism. However, the printing mechanism is not limited to this. For example, a serial-type printing unit may be employed, or a line-type or serial-type printing unit may be used. You may employ | adopt a spray head (for example, inkjet head). Further, as the printing mechanism, an electrostatic head that accumulates static electricity on the recording medium 250 and deposits the photosensitive material with the static electricity may be employed, or the recording medium 250 is immersed in a liquid photosensitive material. An immersion apparatus for depositing the photosensitive material may be employed. Further, a brush, a brush, a roller, or the like may be employed as a printing mechanism.

  In the printing apparatus 200, the light irradiation apparatus 1 including the light irradiation devices 2 </ b> A and 2 </ b> B has a function of exposing the ultraviolet curable ink 3 attached to the recording medium 250 conveyed via the conveyance unit 210. . The light irradiation device 1 is provided so as to face the recording medium 250. More specifically, the first light irradiation device 2 </ b> A constituting the light irradiation apparatus 1 is a surface to which the ultraviolet curable ink 3 of the recording medium 250 is attached downstream of the printing unit 220 in the transport direction. The second light irradiation device 2B has a surface to which the ultraviolet curable ink 3 of the recording medium 250 is applied from the upstream side to the downstream side in the transport direction with respect to the printing unit 220. It is provided facing the non-attached surface on the opposite side. In the printing apparatus 200, the light emitting element 20 has a function of exposing the photosensitive material attached to the recording medium 250.

  The control mechanism 230 has a function of controlling the light emission of the light irradiation device 1. The memory of the control mechanism 230 stores information indicating the characteristics of light that makes it relatively good to cure the ultraviolet curable ink 3 discharged from the printing unit 220. Specific examples of the stored information include wavelength distribution characteristics suitable for curing the ultraviolet curable ink 3 to be ejected, and numerical values representing the emission intensity (emission intensity in each wavelength region). In the printing apparatus 200 of this example, 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. From this, according to the printing apparatus 200 of this example, light can be irradiated with an appropriate ultraviolet irradiation energy according to the characteristics of the ultraviolet curable ink 3 to be used, and the ultraviolet curable type can be irradiated with relatively low energy light. The ink 3 can be cured.

  In the printing apparatus 200, the transport unit 210 transports the recording medium 250 in the transport direction. The printing unit 220 ejects the ultraviolet curable ink 3 to the recording medium 250 being conveyed, and causes the ultraviolet curable ink 3 to adhere to the surface of the recording medium 250. At this time, the ultraviolet curable ink 3 to be applied to the recording medium 250 may be applied to the entire surface, partially applied, or applied in a desired pattern. In the printing apparatus 200, the ultraviolet curable ink 3 deposited on the recording medium 250 is irradiated with ultraviolet rays emitted from the light irradiation device 1 to cure the ultraviolet curable ink 3.

  According to the printing apparatus 200 of this example, the above-described effects of the light irradiation apparatus 1 can be achieved.

  As mentioned above, although the example of specific embodiment of this invention was shown, this invention is not limited to this, A various change is possible within the range which does not deviate from the summary of this invention.

For example, as in the first modification shown in FIG. 8, the length in the moving direction of the object 4 between the upstream end of the first irradiation region 2Aa and the upstream side of the second irradiation region 2Bb. L than _F, the length L _E in the moving direction of the object 4 between the downstream side of the downstream end of the first irradiation region 2Aa and second irradiation region 2Bb may be longer. With such a configuration, it is possible to ensure a long time for irradiating the ultraviolet curable ink 3 with ultraviolet rays, and thus it is possible to improve the curability of the ultraviolet curable ink 3.

  Further, as in the second modification shown in FIG. 9, the distance between the second light irradiation device 2 </ b> Bb and the object 4 may be shorter than the distance between the first light irradiation device 2 </ b> Aa and the object 4. . By setting it as such a structure, the energy density of the light which 2nd light irradiation device 2Bb emits can be made low. This is because the distance between the second light irradiation device 2Bb and the object 4 is short, so even if the energy of the light emitted from the second light irradiation device 2Bb is lowered, it is given to the object 4 This is because the energy density of light can be maintained substantially the same as when the distance to the object 4 is long. That is, when the distance between the second light irradiation device 2Bb and the target object 4 is shorter than the distance between the first light irradiation device 2Aa and the target object 4, the light emitted from the first light irradiation device 2A is reduced. The energy density of the light emitted from the second light irradiation device 2B can be lowered than the energy density, and the number of the light emitting elements 20 arranged in the second light irradiation device 2B can be reduced. For example, it is possible to reduce the amount of current applied to the light emitting element 20, and this contributes to downsizing, cost reduction, and power saving of the second light irradiation device 2B and thus the light irradiation device 1.

Furthermore, although not shown, the energy density of the light emitted from the second light irradiation device 2B may be lower than the energy density of the light emitted from the first light irradiation device 2A. Specifically, the energy density of the light first light irradiation device 2A is irradiated is 3~6W / cm ^2, the energy density of the light second light emitting device 2B is irradiated 3W / cm ² or less is there.

  Here, the energy density is a light emission amount per unit area, and may be measured by a conventionally known optical power meter or the like.

  In order to reduce the energy density of the light emitted by the second light irradiation device 2B, the amount of current applied to the plurality of light emitting elements 20 arranged in the second light irradiation device 2B is reduced, or the second light What is necessary is just to reduce the quantity of the several light emitting element 20 arrange | positioned at the irradiation device 2B, or to make arrangement density small. This contributes to downsizing, cost reduction, and power saving of the second light irradiation device 2B and thus the light irradiation apparatus 1.

  Further, as in the third modification shown in FIG. 10, the energy density of light corresponding to the deposition region 3a in the second irradiation region 2Bb is higher than the energy density of light in other regions in the second irradiation region 2Bb. May be low. With such a configuration, the printability of the printing unit 220 can be maintained high. This is because when the ultraviolet curable ink 3 is applied to the object 4 by the printing means 220, the ultraviolet curable ink 3 is irradiated with ultraviolet light before being applied to the object 4. This is because the curing of the mold ink 3 starts, and the adhesion between the ultraviolet curable ink 3 and the object 4, that is, the printability cannot be maintained high. Here, the energy density of the light corresponding to the deposition region 3a in the second irradiation region 2Bb may be lower than the energy density of the other regions in the second irradiation region 2Bb. Is included, and the second light irradiation device 2B may not be provided in the region corresponding to the deposition region 3a as in the fourth modification shown in FIG. Or even if the 2nd light irradiation device 2B is provided in the area | region corresponding to the deposition area | region 3a, it is not necessary to arrange | position the light emitting element 20 in this corresponding | compatible area | region.

Further, the example of the embodiment of the printing apparatus 200 is not limited to the above example. 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 example of the above-described embodiment, an example in which the light irradiation device 1 is applied to the printing apparatus 200 using the inkjet head 220 is shown. This light irradiation device 1 is, for example, photocuring by spin coating on the surface of the object. The present invention can also be applied to curing various types of photo-curing resins such as a dedicated device for curing the resin. Moreover, you may use the light irradiation device 1 for the irradiation light source etc. in an exposure apparatus, for example.

DESCRIPTION OF SYMBOLS 1 Light irradiation apparatus 2 Light irradiation device 2A 1st light irradiation device 2B 2nd light irradiation device 2Aa 1st light irradiation area | region 2Bb 2nd light irradiation area | region 3 UV curable ink 3a Adhesion area | region 4 Object 4
DESCRIPTION OF SYMBOLS 10 Substrate 11a One main surface 12 Opening part 13 Connection pad 14 Inner peripheral surface 15 Bonding material 20 Light emitting element 21 Element substrate 22 Semiconductor layer 23, 24 Element electrode 30 Sealing material 40 Laminate 41 First insulating layer 42 Second Insulating layer 50 Electrical wiring 110 Heat radiating member 120 Adhesive 200 Printing device 210 Conveying means 211 Mounting table 212 Conveying roller 220 Printing means 220a Discharge hole 230 Control mechanism 250 Recording medium

Claims (6)

A light irradiation apparatus for irradiating ultraviolet light onto an object to which an ultraviolet curable ink or an ultraviolet curable resin is deposited by moving in one direction relatively,
A first light irradiation device disposed opposite to the ultraviolet curable ink or ultraviolet curable resin application surface of the object, and a non-adhesion surface located on the opposite side of the application surface And a second light irradiation device arranged as
The light of the second light irradiation device is longer than the length of the first irradiation region in which the light of the first light irradiation device is irradiated to the adherend surface of the target in the moving direction of the target. The length of the second irradiation region irradiated to the non-adhered surface of the object in the moving direction of the object is long,
The upstream and downstream ends of the first irradiation region in the moving direction of the object are located inside the upstream and downstream ends of the second irradiation region,
The upstream end portion of the second irradiation region is more than the upstream end portion of the deposition region where the ultraviolet curable ink or the ultraviolet curable resin is deposited on the deposition surface. A light irradiation device located on the upstream side.   More than the length in the moving direction between the upstream end of the first irradiation region and the upstream end of the second irradiation region, the downstream of the first irradiation region. The light irradiation apparatus according to claim 1, wherein a length in the moving direction between an end portion and the downstream end portion of the second irradiation region is long.   The light irradiation apparatus according to claim 1, wherein a distance between the second light irradiation device and the object is shorter than a distance between the first light irradiation device and the object.   4. The light according to claim 1, wherein an energy density of light emitted from the second light irradiation device is lower than an energy density of light emitted from the first light irradiation device. 5. Irradiation device.   5. The energy density of light in a region corresponding to the deposition region in the second irradiation region is lower than the energy density of light in other regions in the second irradiation region. The light irradiation apparatus of any one of these. Printing means for printing on a recording medium;
A printing apparatus comprising: the light irradiation apparatus according to claim 1, which irradiates light on the printed recording medium using the recording medium as an object.

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