JP5766008B2 - Light irradiation module, light irradiation apparatus and printing apparatus - Google Patents

Description

  The present invention relates to a light irradiation module, 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 devices have been widely used for the purpose of fluorescence reaction observation in medical and bio fields, sterilization applications, adhesion of electronic components, and curing of ultraviolet curable resins and inks. 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 the global environmental load has been sought worldwide, and there has been an active movement to adopt an ultraviolet light emitting element as a lamp light source capable of relatively long life, energy saving, and ozone generation. .

  However, since the illuminance of the ultraviolet light emitting element is relatively low, for example, as described in Patent Document 1, a device in which a plurality of light emitting elements are mounted on one substrate is prepared, and the plurality of devices are mounted on a support. Configuration modules are commonly used.

  However, the curability of the ultraviolet curable resin is more susceptible to oxygen inhibition when the ultraviolet light emitting element lamp is used as a light source than when a high pressure mercury lamp or a metal halide lamp is used as the lamp light source. This has become known recently.

JP 2008-244165 A

  The present invention has been made in view of the above problems, and even when the object to be cured is an ultraviolet curable resin that is easily affected by oxygen inhibition or the like, light irradiation that can relatively reduce the influence of oxygen inhibition. It aims at providing a module, a light irradiation apparatus, and a printing apparatus.

  The light irradiation module according to the present invention is a light irradiation module for irradiating light on an object moving in one direction relatively, and is a first light emitting element located upstream in the moving direction of the object. And a second light emitting element group located on the downstream side, and a first current supplied to each light emitting element included in the first light emitting element group, and included in the second light emitting element group By making the second current supplied to each light emitting element different, the light emission amount of the first light emitting element group and the light emission amount of the second light emitting element group are made different.

  Further, the light emission amount of the first light emitting element group is larger than the light emission amount of the second light emitting element group.

Furthermore, it is a light irradiation module for irradiating light to an object that moves relatively in both directions, and is located on the first light emitting element group located on one side and the other side of the moving direction of the object. A first light-emitting element group that has a second light-emitting element group and a third light-emitting element group located on the other side of the second light-emitting element group, and is supplied to each light-emitting element included in the first light-emitting element group; At least one of a current and a third current supplied to each light emitting element included in the third light emitting element group and a second current supplied to each light emitting element included in the second light emitting element group. By making the difference, at least one of the light emission amount of the first light emitting element group and the light emission amount of the third light emitting element group is different from the light emission amount of the second light emitting element group.

  In addition, at least one of the light emission amount of the first light emitting element group and the light emission amount of the third light emitting element group is larger than the light emission amount of the second light emitting element group.

  Further, the light emission amount of the first light emitting element group and the light emission amount of the third light emitting element group are larger than the light emission amount of the second light emitting element group.

  A light irradiation apparatus for irradiating light on a relatively moving object, comprising the light irradiation module described above and a control means for controlling the first current and the second current. The light emitting device is characterized in that the first light emitting element group is located on the upstream side in the moving direction of the object with respect to the light irradiation module, and the second light emitting element group is located on the downstream side. To provide.

  Furthermore, for irradiating light to a relatively moving object, comprising the above-described light irradiation module, and a control means for controlling the first current, the second current, and the third current In the light irradiation device, the first light emitting element group and the third light emitting element group selectively emit light only when the control unit is positioned on the upstream side in the moving direction of the object. The light irradiation apparatus characterized by the above is also provided.

  In addition, for irradiating light on an object that moves relatively bidirectionally, the light irradiation module including the above-described light irradiation module and a control unit that controls the first current, the second current, and the third current. In the light irradiation device, when the first light emitting element group is located on the upstream side in the moving direction of the object, the light emission amount of the first light emitting element group is the light emission of the second light emitting element group. And when the third light emitting element group is located upstream of the moving direction of the object, the light emitting amount of the third light emitting element group. Is provided together with a light irradiation device characterized in that the light emission amount of the second light emitting element group and the light emission amount of the first light emitting element group are larger.

  Further, printing comprising: a printing unit that performs printing on a recording medium that relatively moves in one direction; and the above-described light irradiation device that irradiates the printed recording medium with light. A device is also provided.

  Further, printing comprising: a printing unit that performs printing on a recording medium that moves relatively bidirectionally; and the above-described light irradiation device that irradiates light onto the printed recording medium. A device is also provided.

  According to the light irradiation module of the present invention, it is a light irradiation module for irradiating light on an object that moves relatively in one direction, and the first light emission located upstream in the moving direction of the object. A first light-emitting element group that includes an element group and a second light-emitting element group located on the downstream side, and is included in the second light-emitting element group; By making the second current supplied to each light emitting element different from each other, the amount of light emitted from the first light emitting element group and the amount of light emitted from the second light emitting element group are made different. Even if it is an ultraviolet curable resin that is easily affected by oxygen inhibition or the like, the influence of oxygen inhibition can be made relatively small.

FIG. 1 is a plan view of a light irradiation module according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line 1I-1I in the light irradiation module shown in FIG. FIG. 3 is a plan view of a light irradiation apparatus according to an embodiment of the present invention. 4 is a top view of a printing apparatus using the light irradiation apparatus of FIG. FIG. 5 is a side view of the printing apparatus shown in FIG. FIG. 6 is a plain view of a light irradiation apparatus according to another embodiment of the light irradiation apparatus shown in FIG. FIG. 6 is a plain view of a light irradiation apparatus according to another embodiment of the light irradiation apparatus shown in FIG.

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

(Embodiment of light irradiation module)
A light irradiation module 1 shown in FIGS. 1 and 2 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 ultraviolet curable ink on an object 3. It functions as an ultraviolet light generation light source that cures the ultraviolet curable ink by irradiation.

  The light irradiation module 1 is disposed in the base 10 having a plurality of openings 12 in the first main surface 11a, the plurality of connection pads 13 provided in the openings 12, and the openings 12 of the base 10. The plurality of light emitting elements 20 electrically connected to the connection pads 13, the plurality of sealing materials 30 filled in the respective openings 12 and covering the light emitting elements 20, and the base 10 through the adhesive 50 And a heat radiating member 70 connected to the other main surface 11b.

  The base 10 includes a stacked body 40 in which a first insulating layer 41 and a second insulating layer 42 are stacked, and an electric wiring 60 that connects the light emitting elements 20 to each other, and is planar from the first main surface 11a side. The plurality of light emitting elements 20 are supported in the opening 12 provided in the first 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.

  The electrical wiring 60 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 from 20.

  Next, of the plurality of first insulating layers 41, the second insulating layer 42 stacked on the uppermost insulating layer 41 is formed with the opening 12 penetrating the second insulating layer 42. ing.

  The opening 12 has an inner peripheral surface 14 inclined so that the opening area of each opening 12 is larger on the first main surface 11a side of the base body 10 than the mounting surface of the light emitting element 20. For example, it has a substantially rectangular shape. The opening shape is not limited to a rectangle, and may be a substantially circular 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 with 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 in a staggered pattern, for example, over the entire first main surface 11a of the base 10. By arranging in a staggered pattern, the light emitting elements 20 can be arranged with higher density, 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 staggered pattern 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 as described above has the following structure when the first insulating layer 41 and the second insulating layer 42 are made of ceramics or the like. It is manufactured through processes such as First, a plurality of ceramic green sheets manufactured by a conventionally known method is prepared. In the ceramic green sheet corresponding to the second insulating layer, a hole corresponding to the opening is formed by a method such as punching. Next, a metal paste to be the internal wiring 60 is printed 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 as 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 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. Then, a hole corresponding to the opening 12 is formed in the precursor sheet by a method such as laser processing or etching, and the base 10 is completed by thermosetting the hole.

  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 is organic. An organic EL element made of a material is used.

  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 according to the current flowing between the element electrodes 23 and 24 with a predetermined luminance, and emits the light to the outside through the element substrate 21. As is well known, the element substrate 21 can be omitted.

  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), for example, By being formed of 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.

  Then, the heat radiating member 70 is attached to the other main surface 11 b of the base 10 via the adhesive 50.

  The light emitting element 20 included in the light irradiation module 1 of the present embodiment is divided into a first light emitting element group 20a and a second light emitting element group 20b. The current supplied to each light emitting element included in the first light emitting element group 20a can be made different from the current supplied to each light emitting element included in the second light emitting element group 20b. As described above, the light emission amount of each light-emitting element included in the first light-emitting element group 20a can be made different from the light emission amount of each light-emitting element included in the second light-emitting element group 20b.

  Here, the light emission amount is synonymous with the light output of each light emitting element, and may be measured by a conventionally known optical power meter or the like. W (Watt) or the like is used as a unit of light emission amount.

  The electrical wiring 60 connected to the first light emitting element group 20a and the second light emitting element group 20b is provided independently, but the connection method between the light emitting elements 20 of each light emitting element group 20a, 20b is as follows. Even if all are connected in series, all are connected in parallel, a plurality of circuits in which a plurality of light emitting elements are connected in parallel may be formed, and these may be connected in series, and there is no need to limit the connection method .

The light irradiation module 1 of this embodiment is a light irradiation module for irradiating light to the target 3 that moves relatively in one direction, and the first light emitting element group on the upstream side in the moving direction of the target 3. 20
The second light emitting element group 20b is disposed on the downstream side a.

(Embodiment of light irradiation device)
A light irradiation apparatus 100 shown in FIG. 3 includes a light irradiation module 1 and a control unit 110.

  The control means 110 has a function of controlling the current supplied to the first light emitting element group 20a and the second light emitting element group 20b included in the light irradiation module 1.

  In the control means 110 of this embodiment, the current supplied to each light emitting element included in the first light emitting element group 20a is greater than the current supplied to each light emitting element included in the second light emitting element group 20b. As a result, the light emission amount of each light emitting element included in the first light emitting element group 20a is larger than the light emission amount of each light emitting element included in the second light emitting element group 20b. Yes.

  The control means 110 of this embodiment incorporates a pulse current generator and a constant current generator, a pulse current is supplied to the first light emitting element group 20a, and a constant current is supplied to the second light emitting element group 20b. Current is supplied. The maximum value of the pulse current supplied to the first light emitting element group 20a is set to twice the maximum value of the constant current supplied to the second light emitting element group 20b.

  And since the 1st light emitting element group 20a is located in the upstream of the moving direction of the target object 3, and the 2nd light emitting element group 20a is located in the downstream of the moving direction of the target object 3, the target object 3 is It is possible to receive ultraviolet light having a relatively large illuminance in a relatively short time after the start of irradiation with ultraviolet light.

Here, the illuminance is the intensity of light per unit area on the object, and a conventionally well-known measurement in which a light receiving unit of an ultraviolet illuminance meter is installed on the object 3 may be performed. As a unit of illuminance, W / cm ² or the like is used.

  It has been found that the ultraviolet curable ink is subjected to oxygen inhibition after being applied to the object 3 and before being irradiated with ultraviolet light. In the case of ultraviolet light that generates only one or several specific wavelengths, such as an ultraviolet light emitting element, for ultraviolet light having a wavelength distribution over a wide range such as a halogen lamp and a metal halide lamp, ultraviolet curing is performed. It has been found that it is more susceptible to oxygen inhibition of type inks.

  However, if the light irradiation device 100 of this embodiment is used, the influence of oxygen inhibition of the ultraviolet curable ink can be made relatively small. The reason is as follows.

  When the light emission amounts of the light emitting elements 20 included in the light irradiation module 1 included in the light irradiation device 100 are the same, the illuminance of the ultraviolet light of the light irradiation module 1 is approximately the moving direction of the object 3 in the ultraviolet irradiation region. The center is the highest. On the other hand, the light emitting element 20 of the light irradiation module 1 included in the light irradiation apparatus 100 of the present embodiment is divided into a first light emitting element group 20a and a second light emitting element group 20b, and belongs to the first light emitting element group. The light emission amount of each light emitting element 20 is set larger than the light emission amount of each light emitting element 20 belonging to the second light emitting element group. Therefore, the region where the illuminance of the ultraviolet light of the light irradiation module 1 provided in the light irradiation device 100 of the present embodiment is highest on the upstream side in the moving direction of the object 3 in the ultraviolet irradiation region is obtained.

That is, according to the light irradiation device 100 of the present embodiment, the target 3 with the ultraviolet curable ink applied thereto can be given a relatively large illuminance in a relatively short time, so the influence of oxygen inhibition is compared. Can be made smaller.

(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 recording medium 230 (corresponding to the object 3), an inkjet head 220 as a printing mechanism for printing on the transported recording medium 230, and after printing. The above-described light irradiation apparatus 100 for irradiating the recording medium 230 with ultraviolet light is provided.

  The transport mechanism 110 is for transporting the recording medium 230 so as to pass through the inkjet head 120 and the light irradiation device 100 in this order, and is a pair of transports that are disposed opposite to the mounting table 211 and are rotatably supported. And a roller 212. The recording medium 230 supported by the mounting table 211 is sent between the pair of transport rollers 112, and the transport roller 212 is rotated to send the recording medium 230 in the transport direction.

  The inkjet head 220 has a function of attaching a photosensitive material to the recording medium 230 conveyed via the conveyance mechanism 210. The ink-jet head 120 is configured to eject droplets containing the photosensitive material toward the recording medium 230 and adhere to the recording medium 230. 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 ink jet head 220 ejects ink from the ejection holes 220a to the recording medium 230 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 230. Is printed.

  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 230 and attaches the photosensitive material by such static electricity may be employed, or the recording medium 230 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 apparatus 100 has a function of exposing the recording medium 230 to which the photosensitive material is adhered, which is conveyed through the conveyance mechanism 210. The light irradiation device 100 is provided on the downstream side of the inkjet head 120 in the transport direction. In the printing apparatus 200, the light irradiation module 1 has a function of exposing the photosensitive material attached to the recording medium 230.

In the printing apparatus 200, the transport mechanism 210 transports the recording medium 230 in the transport direction. The inkjet head 220 discharges ultraviolet curable ink to the recording medium 230 being conveyed, and causes the ultraviolet curable ink to adhere to the surface of the recording medium 230. At this time, the ultraviolet curable ink to be attached to the recording medium 230 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 230 is irradiated with ultraviolet rays emitted from the light irradiation device 100 to cure the ultraviolet curable ink.

  The printing apparatus 200 of this embodiment can enjoy the effects of the light irradiation module 1. Therefore, in the printing apparatus 200, the light emission amount of each light emitting element included in the first light emitting element group 20a included in the light irradiation module 1, and the light emission amount of each light emitting element included in the second light emitting element group 20b. Can be different. As a result, a relatively large illuminance can be given to the object 3 to which the ultraviolet curable ink is applied in a relatively short time, so that the influence of oxygen inhibition can be made 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, the light irradiation module 1 of the present embodiment is a light irradiation module for irradiating light on an object that moves relatively in one direction, but irradiates light on an object that moves relatively bidirectionally. It may be a light irradiation module. In this case, the light irradiation module 1 includes a first light emitting element group 20a, a second light emitting element group 20b, and a third light emitting element group 20c.

  The arrangement of each light emitting element group on the light irradiation module 1 is the third light emitting element group 20c in addition to the first and second light emitting element groups 20a and 20b of the light irradiation module 1 of the present embodiment as shown in FIG. Alternatively, a part of the second light emitting element group 20b of the light irradiation module of the present embodiment may be used as the third light emitting element group as shown in FIG. In any case, the second light emitting element group 20b is disposed between the first light emitting element group 20a and the third light emitting element group 20c.

  In the light irradiation apparatus 100 shown in FIG. 6, the first light emitting element group 20 a and the third light emitting element group 20 c included in the light irradiation module 1 are selectively caused to emit light by the control unit 110. Specifically, when the first light emitting element group 20a is located on the upstream side of the moving direction of the object 3 with respect to the light irradiation module 1, the first light emitting element group 20a emits light, and the third light emitting element The group 20c is not allowed to emit light. On the other hand, when the third light emitting element group 20c is located on the upstream side in the moving direction of the object 3 with respect to the light irradiation module, the third light emitting element group 20c is caused to emit light, and the first light emitting element group is caused to emit light. I won't let you.

  The position detector 120 determines whether the first light emitting element group 20a or the third light emitting element group 20c is located on the upstream side of the moving direction of the object 3 with respect to the light irradiation module 1.

  The position detection unit 120 may include, for example, a detection sensor for the object 3 in the light irradiation module 1 and detect the positional relationship of the light irradiation module with respect to the object 3 by receiving an output from the sensor. The positional relationship of the light irradiation module with respect to the object 3 may be detected in response to the output of the drive control data of 1 or the positional relationship with respect to the object 3 may be detected by any method (in FIGS. 6 and 7). An embodiment in which the light irradiation module 1 is provided with a detection sensor for the object 3 is shown).

  Each of the light emitting elements 20 of the first and third light emitting element groups 20a and 20c included in the light irradiation module 1 is determined whether to emit light or not to emit light by the control means 110 that receives the output of the position detecting means 120. .

  The light emission amount of each light emitting element 20 of the first and third light emitting element groups 20a and 20c is set larger than the light emission amount of each light emitting element 20 of the second light emitting element group 20b.

  By adopting such a configuration, even when the object 3 moves relatively bidirectionally, the object 3 to which the ultraviolet curable ink is applied is given a relatively large illuminance in a relatively short time. Therefore, the influence of oxygen inhibition can be made relatively small.

  In the light irradiation apparatus 100 shown in FIG. 7, the light emitting module 20 of the first, second, and third light emitting element groups 20 a, 20 b, and 20 c included in the light irradiation module 1 emits light simultaneously by the control unit 110. The light emission amount is controlled to be different as follows. When the first light emitting element group 20a is located on the upstream side of the moving direction of the object 3 with respect to the light irradiation module 1, the light emission amounts of the respective light emitting elements 20 of the first light emitting element group 20a are the second and second light emitting elements. The light emission amount of each light emitting element 20 of the three light emitting element groups 20b and 20c is set larger. Conversely, when the third light emitting element group 20c is located upstream in the moving direction of the object 3 with respect to the light irradiation module 1, the light emission amount of each light emitting element 20 of the third light emitting element group 20c is the first light emission amount. The amount of light emission of each light emitting element 20 of the first and second light emitting element groups 20a and 20b is set larger.

  By adopting such a configuration, even when the object 3 moves relatively bidirectionally, the object 3 to which the ultraviolet curable ink is applied is given a relatively large illuminance in a relatively short time. Therefore, the influence of oxygen inhibition can be made relatively small, and the light irradiation module 1 can be downsized at the same time.

  In addition, although the control means 110 with which the light irradiation apparatus 1 of this embodiment is provided had the pulse current generator which supplies a pulse current, and the constant current generator which supplies a constant current, it supplies only a pulse current. Alternatively, only a constant current may be supplied, or any combination of control means 110 may be used. The control means 110 may be a plurality of independent control means for controlling each light emitting element group.

  Moreover, the control means 110 with which the light irradiation apparatus 1 of this embodiment is provided has a pulse current to each light emitting element of the 1st light emitting element group 20a, and a constant current to each light emitting element of the 2nd light emitting element group 20b. Although supplied, the current supplied to each light emitting element of each light emitting element group may be arbitrarily selected from pulse current, constant current, and the like. The pulse current may be a pulse current having any pulse waveform, and parameters such as duty may be set arbitrarily. What is important is that the light emission amount of each light emitting element of the light emitting element group located on the upstream side of the moving object 3 is made larger than the light emission amount of each light emitting element of the other light emitting element group.

DESCRIPTION OF SYMBOLS 1 Light irradiation module 3 Object 10 Base | substrate 11a One main surface 11b The other main surface 12 Opening part 13 Connection pad 14 Inner peripheral surface 15 Joining material 20 Light emitting element 20a 1st light emitting element group 20b 2nd light emitting element group 20c 3rd Light emitting element group 21 element substrate 22 semiconductor layer 23, 24 element electrode 30 sealing material 40 laminate 41 first insulating layer 42 second insulating layer 50 adhesive 60 electric wiring 70 heat radiation member 100 light irradiation device 110 control Means 120 Position detection means 200 Printing device 210 Conveying mechanism 211 Mounting table 212 Conveying roller 220 Ink jet head 220a Discharge hole 230 Recording medium

Claims (5)

A light irradiation module for irradiating light to a relatively moving object,
The first light emitting element group, the second light emitting element group, and the third light emitting element group, which are sequentially located from one side to the other side in the moving direction of the object,
When the first light emitting element group is located upstream in the moving direction of the object, the light emission amount of the first light emitting element group with respect to the object is greater than the light emission amount of the second light emitting element group. Also grows,
When the third light emitting element group is located upstream in the moving direction of the object, the light emission amount of the third light emitting element group with respect to the object is greater than the light emission amount of the second light emitting element group. A light irradiation module that also gets bigger. When the first light emitting element group is located upstream in the moving direction of the object, the light emission amount of the first light emitting element group with respect to the object is greater than the light emission amount of the third light emitting element group. Also grows,
When the third light emitting element group is located upstream in the moving direction of the object, the light emission amount of the third light emitting element group with respect to the object is greater than the light emission amount of the first light emitting element group. The light irradiation module according to claim 1, which becomes larger. The light irradiation module according to claim 1 or 2,
  A first current supplied to each light emitting element included in the first light emitting element group, a second current supplied to each light emitting element included in the second light emitting element group, and the third current And a control means for controlling a third current supplied to each light emitting element included in the light emitting element group. The said 1st light emitting element group and the said 3rd light emitting element group are selectively light-emitted by the said control means, only when each is located in the upstream of the moving direction of the said target object. Light irradiation device. Printing means for printing on a recording medium that moves relatively bidirectionally;
Irradiating light to the printed the recording medium, printing device that having a, a light irradiation device according to claim 3 or 4.

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