JP5848092B2 - Light irradiation apparatus 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 an ultraviolet curable paint.

  Conventionally, ultraviolet irradiation devices 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 ultraviolet curable inks, and the like. High pressure mercury is used for the lamp light source of the UV irradiation device used for curing UV curable resin used for bonding small parts in the field of electronic parts, etc., and UV curable ink used for printing. Lamps 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 if an ultraviolet light emitting element capable of relatively suppressing the generation of heat is used as a lamp light source, if the ultraviolet ray is irradiated onto a heat sensitive plastic film or the like, the plastic film contracts due to the heat generated from the lamp light source. Such problems occur. In addition, if the illuminance of ultraviolet rays is reduced to suppress the thermal effect, the curing of ultraviolet curable ink and the like becomes insufficient, and the adhesion between the ultraviolet curable ink and the adherent medium of the ultraviolet curable ink decreases. A malfunction occurs. Therefore, for example, as described in Patent Document 1, an apparatus for cooling an object while performing ultraviolet irradiation has been proposed.

  However, since such a device is a complicated and large-sized device that requires the provision of a cooler, it is possible to reduce the size of the light by using an ultraviolet light emitting element and sufficiently curing the ultraviolet ray while having a relatively small heat influence. An irradiation device was desired.

JP-A-11-170683

  This invention is made | formed in view of the said problem, and it aims at providing the light irradiation apparatus and printing apparatus with little heat influence by ultraviolet irradiation.

  The light irradiation device of the present invention is a light irradiation device for irradiating light containing ultraviolet light onto a film-like object having a light transmission property coated with ultraviolet curable ink or ultraviolet curable resin. A light irradiation device disposed so as to face one main surface of the object, and the other side of the object positioned downstream of the light irradiation device in the moving direction of the object with respect to the light irradiation device. Reversing the direction of movement of the object so that the other main surface of the reversed object is opposed to the light irradiation device through the object located above by reversing downward by contacting the main surface side And a first return roller.

Further, in the above configuration, a first guide roller is provided on one main surface side of the object below the light irradiation device side with respect to the first return roller, and the first guide roller includes the first guide roller, Abutting on the one main surface side of the lower object so that the distance between the opposing other main surfaces of the object reversed by the first return roller is shorter than the diameter of the first return roller; Features.

  Furthermore, in the above-described configuration, the lower object is positioned on the downstream side of the light irradiation device in the moving direction with respect to the light irradiation device, and is in contact with the one main surface side of the object and is turned downward, It has a 2nd return roller which reverses the direction of movement of the above-mentioned object so that one main surface of the above-mentioned object turned up may face the above-mentioned light irradiation device via the above-mentioned object located in the upper part .

  Further, in the above-described configuration, a second guide roller is provided on the other main surface side of the object that is the lowermost on the light irradiation device side than the second return roller, and the second guide roller includes: Abutting against the other main surface side of the lowermost object so that the distance between the opposing one main surfaces of the object reversed by the second return roller is shorter than the diameter of the second return roller. It is characterized by that.

  Furthermore, in the above configuration, the first return roller is characterized in that the diameter is smaller at the center than at both ends.

  Furthermore, a conveying unit that conveys a recording medium as a film-like object having optical transparency, a printing unit that prints an ultraviolet curable ink or an ultraviolet curable resin on the recording medium, and the printed recording There is also provided a printing apparatus comprising a light irradiation device having any one of the above-described configurations that irradiates a medium with light including ultraviolet light.

  According to the light irradiation apparatus of the present invention, the light irradiation device arranged so as to face one main surface of the film-like object having light permeability, and the movement direction of the object with respect to the light irradiation device Located on the downstream side of the light irradiation device, abuts against the other main surface side of the object and flips downward, through the object on which the other main surface of the inverted object is positioned above A first return roller that reverses the moving direction of the object so as to face the light irradiation device, so that the light emitted from the light irradiation device is first irradiated to the object located above, and then Since the light transmitted through the object is irradiated to the object located below, the light can be used efficiently, and therefore the illuminance of the light emitted from the light irradiation device can be made relatively low. As a result, it is possible to realize a miniaturized light irradiation apparatus that sufficiently cures ultraviolet rays and has a relatively small heat effect from the light irradiation device.

It is the schematic of the light irradiation apparatus which concerns on one Embodiment of this invention. It is a top view of the light irradiation device shown in FIG. It is sectional drawing along the 2I-2I line | wire in 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 the schematic of the light irradiation apparatus which concerns on other embodiment of this invention. It is a figure for demonstrating the shape of the return roller which comprises the light irradiation apparatus shown in FIG.

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

(Embodiment of light irradiation device)
A light irradiation apparatus 1A 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 the ultraviolet curable ink 3 is attached to a light transmissive object 4 (recording medium). By irradiating light containing ultraviolet light after being deposited, it functions as an ultraviolet irradiation device for curing the ultraviolet curable ink 3.

  The light irradiation apparatus 1A includes a light irradiation device 2 and a return roller 5a. The light irradiation device 2 functions as a light source for generating ultraviolet rays and is disposed so as to face the object 4 to which the ultraviolet curable ink 3 is applied. In the light irradiation apparatus 1 </ b> A of the present embodiment, the light irradiation device 2 is disposed on the surface of the object 4 to which the ultraviolet curable ink 3 is attached. The return roller 5a is positioned downstream of the light irradiation device 2 in the moving direction of the object 4 with respect to the light irradiation device 2, and is positioned on the opposite side of the surface of the object 4 to which the ultraviolet curable ink 3 is applied. It is in contact with the non-adhering surface side. The return roller 5a functions as a reversing unit that reverses the object 4 downward. In the light irradiation apparatus 1A of the present embodiment, the light irradiation device 2, the object 4 located above, and the object 4 located below are arranged so as to be substantially parallel.

  With this configuration, the object 4 to which the ultraviolet curable ink 3 is applied is irradiated with the first ultraviolet light from the surface to which the ultraviolet curable ink 3 is applied by the light irradiation device 2, and the return roller After being inverted downward by 5 a, the second ultraviolet irradiation is performed from the non-adhering surface side of the ultraviolet curable ink 3 by the ultraviolet rays transmitted through the upper object 4. Thus, since the object 4 is irradiated with ultraviolet rays a plurality of times, it can be efficiently irradiated with ultraviolet rays, so that the illuminance of ultraviolet rays emitted from the light irradiation device 2 can be made relatively low, and the object 4 is attached to the object 4. While the cured UV curable ink 3 is sufficiently cured, the heat generation of the light irradiation device 2 can be reduced, and the influence of heat on the object 4 can be made relatively small.

  Here, the light irradiation device 2 which comprises the light irradiation apparatus 1A is demonstrated using FIG. 2 and FIG.

  The light irradiation device 2 functions as an ultraviolet irradiation light source of the light irradiation apparatus 1A as described above.

  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, Adhering to the plurality of light emitting elements 20 electrically connected to the connection pads 13, the plurality of sealing materials 30 covering the light emitting elements 20 filled in the respective openings 12, and the other main surface 11b of the base body 10. And a heat dissipating member 60 joined via the agent 50.

  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 60 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 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 electrical wiring 60 is formed in a predetermined pattern using a conductive material such as tungsten (W), molybdenum (Mo), manganese (Mn), copper (Cu), and the like. Alternatively, it functions as a power supply wiring for supplying a 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, but may be a rectangle.

  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, zirconium oxide. It is preferable to form the sintered body and the 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, to arrange in a staggered pattern is synonymous with arranging at the grid points of the diagonal grid.

  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 body 10 including the laminate 40 composed of the first insulating layer 41 and the second insulating layer 42 as described above is used 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 following methods can be considered as a manufacturing method of the base | substrate 10, 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 portion 12 of the base body 10, the connection pad 1 electrically connected to the light emitting element 20.
3, a light emitting element 20 connected to the connection pad 13 by a bonding material 15 such as solder, gold (Au) wire, aluminum (Al) wire, and the like, and a sealing material 30 for sealing the light emitting element 20 are provided. Yes.

  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 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 for the bonding material 15.

  In the present embodiment, an LED that emits UV light having a wavelength spectrum peak of 250 to 395 [nm] or less is employed as the light emitting element 20. 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.

  Further, 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), 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.

  Moreover, the light irradiation device 2 can enhance the heat radiation effect by adhering to the heat radiating member 60 via an adhesive 50 such as a silicone resin or an epoxy resin. As a material for forming the heat radiating member 60, a material having high thermal conductivity is preferable. Examples thereof include various metal materials, ceramics, and resin materials. Copper (Cu) is adopted as the material of the heat radiation member 60 in the light irradiation device 2 constituting the light irradiation apparatus 1A of the present embodiment.

(Embodiment of printing apparatus)
As an embodiment of the printing apparatus of the present invention, the printing apparatus 200 shown in FIGS. 4 and 5 will be described as an example. The printing apparatus 200 includes a transport mechanism 210 for transporting a light-transmissive recording medium 250, an inkjet head 220 as a printing mechanism for printing on the transported recording medium 250, and a recording medium 250 after printing. Are provided with a light irradiation device 1B for irradiating light including ultraviolet rays, and a control mechanism 230 for controlling light emission of the light irradiation device 1B. Here, the light transmissive recording medium 250 corresponds to the above-described light transmissive object 4. The recording medium 250 may have a roll shape in which a recording medium 250 used in a conventionally known roll-to-roll method is wound around a roll, or may be a sheet shape such as a rectangle. Good. The material of the recording medium 250 may be any material as long as it has optical transparency. The recording medium 250 is not limited to a film-like material manufactured from a synthetic resin or the like, and is manufactured by laminating fiber-like raw materials such as paper and cloth. It may be a thing.

  The light irradiation apparatus 1B constituting the printing apparatus 200 of the present embodiment includes a light irradiation device 2 and return rollers 5a and 5b. The return roller 5a is positioned downstream of the light irradiation device 2 in the moving direction of the recording medium 250 with respect to the light irradiation device 2, and is positioned on the opposite side of the recording medium 250 to which the ultraviolet curable ink 3 is attached. It abuts on the non-adhering surface side and functions as a reversing means for reversing the object 4 downward. The return roller 5b is located on the downstream side of the light irradiation device 2 in the moving direction of the lower recording medium 250 with respect to the light irradiation device 2, and is in contact with the surface to which the ultraviolet curable ink 3 of the recording medium 250 is attached. And functions as an inverting means for inverting the recording medium 250 further downward. In the light irradiation apparatus 1B constituting the printing apparatus 200 of the present embodiment, the return roller 5a, the light irradiation device 2, the recording medium 250 positioned above, and the recording medium 250 positioned below are substantially parallel. 5b is arranged.

  With this configuration, the recording medium 250 on which the ultraviolet curable ink 3 is applied is first irradiated with the first ultraviolet light from the surface to which the ultraviolet curable ink 3 is applied by the light irradiation device 2, and the return is performed. After being inverted downward by the roller 5 a, the second ultraviolet irradiation is subsequently performed from the non-adhering surface side of the ultraviolet curable ink 3 by the ultraviolet rays transmitted through the upper recording medium 250. Further, after being inverted downward by the return roller 5 b, the third ultraviolet irradiation is performed from the surface on which the ultraviolet curable ink 3 is adhered by the ultraviolet rays transmitted through the upper recording medium 250. As described above, since the recording medium 250 is irradiated with ultraviolet rays a plurality of times, the illuminance of the ultraviolet rays emitted from the light irradiation device 2 can be made relatively low, and the ultraviolet curable ink 3 attached to the recording medium 250 can be removed. The effect of heat on the recording medium 250 can be made relatively small while being sufficiently cured.

  In addition, the light irradiation apparatus 1B is provided with a return roller 5b in addition to the above-described light irradiation apparatus 1A, and is a modification of the light irradiation apparatus 1A.

  The transport mechanism 210 is for transporting the recording medium 250 so as to pass through the inkjet head 220 and the light irradiation device 1B in this order. The transport mechanism 210 and the mounting table 211 are opposed to each other and are rotatably supported. The roller 212 and the adjustment roller 213 that adjusts the recording medium 250 inverted downward by the light irradiation device 1B to the height of the mounting table 211 are configured. The transport mechanism 210 feeds the recording medium 250 supported by the mounting table 211 between the pair of transport rollers 212 and feeds the recording medium 250 in the transport direction by rotating the transport roller 212. .

  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, the ultraviolet curable ink 3 is used as the photosensitive material. As the photosensitive material, in addition to the ultraviolet curable ink 3, for example, a photosensitive resist, a photocurable resin, and the like can be given.

  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 the ultraviolet curable ink 3 from the ejection holes 220a. The inkjet head 220 ejects ink from the ejection holes 220a to the recording medium 250 conveyed in a direction orthogonal to the arrangement of the ejection holes 220a, and deposits the ink on the recording medium, thereby recording the recording medium 250. To print.

  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 on the recording medium 250 and attaches the photosensitive material with the static electricity may be employed. Alternatively, the recording medium 250 may be immersed in a liquid photosensitive material and the photosensitive medium may be used. An immersion apparatus for attaching a conductive material may be employed. Furthermore, you may employ | adopt a brush, a brush, and a roller as a printing mechanism.

  In the printing apparatus 200, the light irradiation device 1 </ b> B has a function of exposing the photosensitive material attached to the recording medium 250 conveyed via the conveyance mechanism 210. The light irradiation device 1 </ b> B 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 the light emission of the light irradiation device 1B. 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 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 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 3 attached to the recording medium 250 is irradiated with light including ultraviolet rays emitted from the light irradiation device 1 </ b> B to cure the ultraviolet curable ink 3.

  The printing apparatus 200 according to the present embodiment can enjoy the effects of the light irradiation apparatus 1B. In the printing apparatus 200 according to the present embodiment, the light irradiation apparatus 1B includes the light irradiation device 2 and the return rollers 5a and 5b, and is positioned downstream of the light irradiation device 2 in the moving direction with respect to the light irradiation device 2, respectively. Since the recording medium 250 functions as a reversing unit that inverts the recording medium 250 downward, the recording medium 250 is irradiated with ultraviolet rays a plurality of times, so that the ultraviolet rays can be efficiently emitted. Can be made relatively low, and the effect of heat on the recording medium 250 can be made relatively small while sufficiently curing the ultraviolet curable ink 3 applied to the recording medium 250.

The specific embodiment of the present invention has been described above, but the light irradiation apparatus 1A of the present invention is not limited to this, and various modifications can be made without departing from the gist of the invention.

  For example, as shown in FIG. 6, a first guide roller 6a may be further provided. The first guide roller 6a is positioned closer to the light-irradiating device 2 side than the first return roller 5a and closer to the surface of the UV-curable ink 3 on the object 4 below. The first guide roller 6a is disposed such that the distance between the opposite surfaces of the ultraviolet curable ink 3 facing the object 4 reversed by the first return roller 5a is shorter than the diameter of the return roller 5a. Yes.

  With this arrangement, the distance of the object 4 reversed by the return roller 5a from the light irradiation device 2 becomes relatively short, so that the ultraviolet irradiation received by the ultraviolet curable ink 3 by the second ultraviolet irradiation. Energy can be relatively high. Therefore, a miniaturized light irradiation apparatus is realized in which the illumination effect of the light emitting device 2 is kept relatively low, the ultraviolet light is sufficiently cured, and the thermal influence from the light emitting element is relatively small.

  Although a specific embodiment of the present invention has been described as a light irradiation device that cures the ultraviolet curable ink 3 with light containing ultraviolet rays, an electronic component or the like is bonded to the light transmissive object 4 with an ultraviolet curable resin. It can also be used as a light irradiation device that constitutes the bonding device.

  Further, as described above, the light irradiation apparatus 1B shown in the embodiment of the printing apparatus 200 is provided with the return roller 5b in addition to the light irradiation apparatus 1A, and is a variation of the light irradiation apparatus 1A.

  In the light irradiation device 1B, although not shown, the return rollers 5a and 5b may be provided with guide rollers 6a and 6b, respectively. The guide rollers 6a and 6b are in contact with the light irradiation device 2 side of the return rollers 5a and 5b, respectively, and are in contact with the surface of the object 4 that is reversed by the return rollers 5a and 5b. And it arrange | positions so that the distance of the adhesion surfaces of the ultraviolet curable ink 3 or the non-adhesion surfaces may become shorter than the diameter of return roller 5a, 5b in the target object 4. FIG. With such an arrangement, the distance from the light irradiation device 2 of the object 4 reversed by the return rollers 5a and 5b becomes relatively short, so that the ultraviolet curable ink 3 receives by the second ultraviolet irradiation. The ultraviolet irradiation energy can be made relatively high. Thus, a miniaturized light irradiation apparatus is realized in which ultraviolet light is sufficiently cured while maintaining the illuminance of the light irradiation device 2 relatively low and the heat influence from the light emitting element is relatively small.

  Here, the number of return rollers and guide rollers is not particularly limited, and light including ultraviolet rays emitted from the light irradiation device 2 passes through the light-transmitting object 4 and covers the object 4 positioned below. If it contributes to the curing of the applied ultraviolet curable ink 3, the inversion of the object 4 may be repeated by increasing the number of return rollers and guide rollers. By further repeating the inversion, the irradiation of ultraviolet rays can be performed more efficiently, so that the illuminance of light including ultraviolet rays emitted from the light irradiation device 2 can be kept relatively low.

Furthermore, as shown in FIGS. 7A and 7B, the diameter of the return roller 5a is preferably shorter at the center than at both ends. By setting it as such a shape, the contamination by the ultraviolet curable ink 3 of the target object 4 can be prevented. For example, in order to improve the adhesion between the ultraviolet curable ink 3 and the object 4, there is a case where it is desired to perform ultraviolet irradiation by the light irradiation device 2 from the non-adhering surface side of the ultraviolet curable ink 3 of the object 4. . In this case, it is necessary to direct the adherence surface of the ultraviolet curable ink 3 to the return roller 5a side, but when the adherent portion of the ultraviolet curable ink 3 and the return roller 5a come into contact with each other, the ultraviolet curable ink before curing is provided. 3 adheres to the return roller 5a, and the ultraviolet curable ink 3 attached to the return roller 5a adheres again to the object 4, thereby contaminating the object 4. Therefore, by making the diameter of the return roller 5a shorter at the center than at both ends, it is possible to prevent the adherence portion of the ultraviolet curable ink 3 and the return roller 5a from coming into contact with each other, and the ultraviolet rays of the object 4 can be prevented. Contamination due to the curable ink 3 can be prevented.

  In addition, it is preferable that the diameter of the rollers such as the return roller 6a and the guide rollers 5a and 5b that are in contact with the object 4 other than the return roller 5a is shorter at the center than at both ends. By adopting such a shape, it becomes possible to prevent the rollers such as the return roller 5b and the guide rollers 6a and 6b from coming into direct contact with the adherence surface of the ultraviolet curable ink 3, and the object caused by dust due to the wear of the rollers. It becomes possible to prevent the contamination of the object 4.

  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 surface of the roller may be used. In this case, the same effect can be obtained.

1A, 1B Light irradiation device 2 Light irradiation device 3 UV curable ink 4 Object 5a First return roller 5b Second return roller 6a First guide roller 10 Base 11a One main surface 11b The other main surface 12 Opening 13 Connection pad 14 Inner peripheral surface 15 Bonding material 20 Light emitting element 21 Element substrate 22 Semiconductor layers 23 and 24 Element electrode 25 Light emitting element row 30 Sealing material 40 Laminate 41 First insulating layer 42 Second insulating layer 50 Adhesive 60 Heat radiation member 200 Printing device 210 Conveying mechanism 211 Loading table 212 Conveying roller 213 Adjusting roller 220 Ink jet head 220a Discharge hole 230 Control mechanism 250 Recording medium

Claims (5)

A light irradiating device for irradiating light containing ultraviolet light onto a film-like object having light permeability, which is coated with ultraviolet curable ink or ultraviolet curable resin,
A light irradiation device arranged to face one main surface of the object;
Located on the downstream side of the light irradiation device in the moving direction of the object with respect to the light irradiation device, abuts against the other main surface side of the object and reverses downward, and the other main object of the reversed object A first return roller for reversing the direction of movement of the object so as to face the light irradiation device via the object whose surface is located above ;
A first guide roller located on the light irradiation device side with respect to the first return roller in a side view and located on the one main surface side of the object that has been reversed and passed through the first return roller And comprising
The first guide roller, so that the distance between the inverting the front and rear of the other main surface on the opposite positions of the object in a side view is shorter than the diameter of the first return roller, of the object On the other hand, the light irradiation device is in contact with the main surface side. In a side view, the first return roller is positioned away from the light irradiating device as a reference, abuts against one main surface side of the object reversed by the first return roller, and further reversed downward. Te, a second return roller for reversing the direction of movement of said object such that one main surface of the object to be inverted faces the light irradiation device via the object to be located above, further comprising a The light irradiation apparatus according to claim 1 . A second guide roller located on the light irradiation device side with respect to the second return roller in a side view and located on the other main surface side of the object reversed through the first return roller Further comprising
Guide rollers second, so that the distance between one main surface of the inversion before and after a position opposite of the object in a side view made shorter than the diameter of the second return rollers, of the object The light irradiation apparatus according to claim 2 , wherein the light irradiation apparatus is in contact with the other main surface side. Wherein at least one of the first return roller and the second return roller, the light according to any one of claims 1 to 3, characterized in that is shorter in the central portion than at both ends in diameter Irradiation device. Transport means for transporting a recording medium as a film-like object having optical transparency;
Printing means for printing ultraviolet curable ink or ultraviolet curable resin on the recording medium;
Printing apparatus comprising: the light irradiation device, a according to any one of claims 1 to 4 is irradiated with light containing ultraviolet rays printed the recording medium.

Images