JP2012245750A - Light irradiation module and printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curable light irradiation module, which is hardly affected by an oxygen disturbance at the curing of an ultraviolet ray curable ink, and to provide a printing device.SOLUTION: This light irradiation device comprises a base body, a plurality of light-emitting elements which are vertically and laterally aligned on the upper face of the base body, and a plurality of lenses which are arranged so as to cover the light-emitting elements and emit light emitted by the light-emitting elements to the outside. The plurality of lenses comprise a plurality of first lenses and a plurality of second lenses which are located at the downstream side of the moving direction rather than the first lenses with respect to the light irradiation device being an object. Since the light axis of the light emitted via the second lens is inclined toward the upstream side of the moving direction with respect to a normal line of the upper face of the base body, a peak position of the luminance of ultraviolet rays irradiated from the plurality of light-emitting elements can be positioned at the upstream side of the moving direction with respect to the light irradiation device being the object.

Description

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

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

  In recent years, 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 as a lamp light source capable of suppressing the generation of ozone with a relatively long life, energy saving. .

  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. The module of the structure is generally used, and the light quantity necessary for the effect of the ultraviolet curable ink is secured.

  However, the surface emitting type ultraviolet irradiation device using the ultraviolet light emitting element as a lamp light source has a problem that a larger amount of light is required to cure the ultraviolet curable ink. The reason is that UV curable ink is generally known to be affected by oxygen inhibition during UV curing. However, when the UV light emitting element is used as a lamp light source, a conventional high pressure mercury lamp or This seems to be because it is more susceptible to oxygen inhibition because only ultraviolet rays of a specific wavelength are irradiated compared to metal halide lamps.

JP 2008-244165 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a light irradiation module and a printing apparatus in which ultraviolet curable ink is not easily affected by oxygen inhibition during curing.

A light irradiation device according to the present invention is a light irradiation device for irradiating light to a relatively moving object, and a base, and a plurality of light emitting elements arranged vertically and horizontally on the upper surface of the base, A plurality of lenses provided so as to cover the light emitting element and emitting the light emitted from the light emitting element to the outside. The plurality of lenses includes a plurality of first lenses and the first lens. A plurality of second lenses positioned on the downstream side of the moving direction of the object relative to the light irradiation device,
The optical axis of the light emitted through the second lens is inclined toward the upstream side in the moving direction with respect to the normal line of the upper surface of the substrate.

In addition, the inclination of the optical axis of the light emitted through the plurality of second lenses is gradually increased from the upstream side to the downstream side in the moving direction.

  Further, each of the second lenses is provided corresponding to each of the light emitting elements, and the center of each of the second lenses in plan view is the movement relative to the center of the corresponding light emitting element in plan view. It is located upstream in the direction.

  In addition, each of the second lenses is provided corresponding to each of the light emitting elements, and the moving direction of the center of each of the second lenses in the plan view with respect to the center of the corresponding light emitting element in the plan view is set. The amount of deviation to the upstream side is gradually increased from the upstream side to the downstream side in the moving direction.

  Further, each of the second lenses is provided corresponding to a plurality of light emitting elements, and the center of each of the second lenses in plan view is the center of the arrangement of the corresponding plurality of light emitting elements in plan view. On the other hand, it is located on the upstream side in the moving direction.

  Each of the second lenses is provided to correspond to a plurality of light emitting elements, and the center of each of the second lenses in plan view is the center of the arrangement of the corresponding light emitting elements in plan view. On the other hand, the amount of deviation of the moving direction to the upstream side is gradually increased from the upstream side to the downstream side in the moving direction.

  Furthermore, the center of the cross section in the planar direction of the second lens is located gradually upstream from the lower surface to the upper surface of the second lens.

  Further, the shift amount of the center of the cross section in the plane direction of the second lens toward the upstream side in the moving direction from the lower surface to the upper surface of the second lens gradually increases from the upstream side to the downstream side in the moving direction. It is characterized by being larger.

  Further, the optical axis of the light emitted through the first lens is parallel to the normal line of the upper surface of the base or is inclined downstream in the moving direction.

  In addition, a light irradiation module is provided in which a plurality of light irradiation devices are placed on the heat dissipation member.

  The present invention also provides a printing apparatus comprising printing means for printing on a recording medium and a light irradiation module for irradiating the printed recording medium with light.

  According to the light irradiation module of the present invention, the base, the plurality of light emitting elements arranged in the vertical and horizontal directions on the upper surface of the base, and the light emitted from the light emitting element provided so as to cover the light emitting element are transmitted to the outside. A plurality of lenses for emitting light, and the plurality of lenses are located on the downstream side of the moving direction of the object with respect to the light irradiation device relative to the first lens. And the optical axis of the light emitted through the second lens is inclined toward the upstream side in the moving direction with respect to the normal line of the upper surface of the substrate. The peak position of the illuminance of ultraviolet rays emitted from a plurality of light emitting elements can be located upstream in the moving direction of the object relative to the light irradiation device. As a result, a light irradiation module capable of being hardened to be hardly affected by oxygen inhibition when the ultraviolet curable ink is cured is realized.

FIG. 1 is a plan view of a light irradiation module according to an embodiment of the present invention. FIG. 2A is a cross-sectional view taken along line 1I-1I in the light irradiation module shown in FIG. FIG. 2B is a cross-sectional view taken along line 1II-1II in the light irradiation module shown in FIG. FIG. 3 is a schematic diagram for explaining the illuminance distribution with respect to the moving direction of the object. 4 is a top view of a printing apparatus using the light irradiation module shown in FIG. FIG. 5 is a side view of the printing apparatus shown in FIG. FIG. 6 is a diagram illustrating the optical axis of light emitted through the optical lens 17 of the light irradiation module according to another embodiment of the present invention. FIG. 7 is a diagram illustrating the center of the arrangement of the light emitting elements. Fig.8 (a) is a figure for demonstrating the cross-sectional shape of the optical lens 17b of the light irradiation module which concerns on other embodiment of this invention. FIG. 8B is a view for explaining the position of the center of the cross section of the optical lens 17b shown in FIG.

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

(Embodiment of light irradiation module)
The light irradiation module 1 shown in FIGS. 1 and 2 is incorporated in a printing apparatus such as an offset printing apparatus or an inkjet printing apparatus that uses ultraviolet curable ink, and irradiates ultraviolet rays after the ultraviolet curable ink is deposited on a recording medium. By doing so, it functions as an ultraviolet light generation light source of an ultraviolet irradiation module for curing the ultraviolet curable ink.

  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. , A plurality of light emitting elements 20 electrically connected to the connection pad 13, a plurality of sealing materials 30 filled in each opening 12 and covering the light emitting elements 20, and light emission corresponding to each opening 12 A plurality of optical lenses 17 disposed so as to cover the element 20 and a heat radiating member 110 attached to the base 10 via a first adhesive 60 are provided.

  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 50 that connects the light emitting elements 20 to each other, and is planar from the first main surface 11a side. The light emitting element 20 is 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.

  Next, the electrical wiring 50 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 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 circular shape. The opening shape is not limited to a circular shape, and may be a substantially rectangular shape.

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

  In order to improve the light extraction efficiency, the material of the second insulating layer 42 is a porous ceramic material having a relatively good reflectivity with respect to light in the ultraviolet region, such as an aluminum oxide sintered body, an oxide It is preferable to form 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 vertically and horizontally over the entire first main surface 11 a of the base 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 zigzag 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 10 provided with the laminate 40 composed of the first insulating layer 41 and the second insulating layer 42 as described above, when the first insulating layer 41 and the second insulating layer 42 are made of ceramics or the like, It is manufactured through the following steps. First, a plurality of ceramic green sheets manufactured by a conventionally known method is prepared. A hole corresponding to the opening is formed in the ceramic green sheet corresponding to the opening 12 by a method such as punching. Next, a metal paste to be the internal wiring 60 is printed (not shown) on the green sheet, and then the green sheet is laminated so that the printed metal paste is positioned between the green sheets. Examples of the metal paste that becomes the electrical 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.

  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 electrical wiring 50 are disposed between the precursor sheets and the lead terminals are embedded in the precursor sheets. Examples of the material for forming the lead terminal include metal materials such as Cu, Ag, Al, iron (Fe) -nickel (Ni) -cobalt (Co) alloy, and Fe-Ni alloy. And after forming the hole corresponding to the opening part 12 in a precursor sheet | seat by methods, such as a laser processing and an etching, the base | substrate 10 is completed by thermosetting this.

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

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

The light-emitting element 20 includes, for example, a light-emitting diode in which a p-type semiconductor layer and an n-type semiconductor layer made of a semiconductor material such as GaAs or GaN are stacked on an element substrate 21 such as a sapphire substrate, or a semiconductor layer 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. 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 lip connection technique using solder or the like as the bonding material 15.

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

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

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

  The sealing material 30 is a material having a refractive index between the refractive index of the element substrate 21 constituting the light emitting element 20 (in the case of sapphire: 1.7) and the refractive index of air (about 1.0), 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.

  And the optical lens 17 is arrange | positioned so that the light emitting element 20 may be covered on the above-mentioned sealing material 30 via the 2nd adhesive agent 70. FIG. In the light irradiation device of this embodiment, a plano-convex lens is used as the optical lens 17. That is, in the optical lens 17 of the present embodiment, one main surface is convex and the other main surface is flat, and the cross-sectional area decreases from the other main surface toward the one main surface.

  The optical lens 17 is formed of, for example, silicone and has a function of condensing light emitted from the light emitting element 20. In addition to the silicone described above, examples of the material of the optical lens include thermosetting resins such as urethane and epoxy, plastics such as thermoplastic resins such as polycarbonate and acrylic, sapphire, and inorganic glass.

  The optical lens 17 includes a plurality of first optical lenses 17a located on the upstream side in the moving direction of the object and a plurality of second optical lenses 17b located on the downstream side in the moving direction of the object. Yes. The center of the optical lens 17a in plan view and the center of the light emitting element 20 in plan view are substantially coincident. In other words, the optical axis of the light emitted from the light emitting element 20 through the optical lens 17 a is in a substantially normal direction of the first main surface 11 a of the base 10.

On the other hand, the center of the optical lens 17b in plan view is located upstream of the center of the light emitting element 20 in plan view in the moving direction of the object. That is, the optical axis of the light emitted from the light emitting element 20 through the optical lens 17b is inclined toward the upstream side in the moving direction of the object with respect to the normal direction of the first main surface 11a. In the present embodiment, the amount of deviation between the center of the optical lens 17a in plan view and the center of the light emitting element 20 in plan view is the same, and thus light emitted from the light emitting element 20 through the optical lens 17b. The optical axes of all have the same inclination with respect to the normal direction of the first major surface 11a.

  With such a configuration, in the conventional light irradiation module, as shown by the dotted line in FIG. 3, the peak of illuminance in the moving direction with respect to the object is located at the approximate center of the light irradiation module. In the light irradiation module of the embodiment, as indicated by the solid line in FIG. 3, the peak of illuminance is located on the upstream side in the moving direction with respect to the object of the light irradiation module.

  In order to cure the ultraviolet curable ink, a certain amount of ultraviolet irradiation energy is required. The ultraviolet irradiation energy is obtained by the product of the ultraviolet illuminance and the ultraviolet irradiation time, and corresponds to the area of the region surrounded by the dotted or solid line in FIG. 3 and the horizontal axis below the graph in FIG.

  Therefore, in the light irradiation module of this embodiment, the time required for the ultraviolet curable ink to cure after the object on which the ultraviolet curable ink is applied enters the light irradiation region is compared with the conventional light irradiation module. Can be shortened.

  That is, it is generally known that curing of ultraviolet curable ink by ultraviolet irradiation is damaged by oxygen in the air (oxygen inhibition), but according to the light irradiation module of the present embodiment, the ultraviolet curable type is used. Since the time from when the ink is irradiated with ultraviolet rays until it is cured can be made relatively short, it is possible to perform curing that is less susceptible to oxygen inhibition.

  The heat radiating member 110 is attached to the base 10 via a first adhesive 60 such as a silicone resin or an epoxy resin. The heat radiating member 110 functions as a support for the base 10.

  As a material for forming the heat radiating member 110, a material having a high thermal conductivity is preferable. Examples thereof include various metal materials, ceramics, and resin materials. The heat radiating member 110 of this embodiment is made of copper.

(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 the recording medium 250, an inkjet head 220 as a printing mechanism for printing on the transported recording medium 250, and an ultraviolet for the recording medium 250 after printing. The light irradiation module 1 which irradiates light and the control mechanism 230 which controls light emission of the light irradiation module 1 are provided.

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

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

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

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

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

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

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

The printing apparatus 200 of this embodiment can enjoy the effects of the light irradiation module 1. In the printing apparatus 200 according to the present embodiment, the optical lens 17 included in the light irradiation module 1 is positioned on the downstream side in the moving direction of the target object and the plurality of first optical lenses 17a positioned on the upstream side in the moving direction of the target object. The center of the optical lens 17b in plan view is located upstream of the center of the light emitting element 20 in plan view in the moving direction of the object. Therefore, the optical axis of the light emitted from the light emitting element 20 through the optical lens 17b is inclined toward the upstream side in the moving direction of the object with respect to the normal direction of the first main surface 11a, and the ultraviolet ray It is possible to shorten the time required for the ultraviolet curable ink to be cured after the object on which the curable ink is applied enters the light irradiation region, compared to the conventional light irradiation module. As a result, therefore, in the printing apparatus 200 of the present embodiment, it is possible to perform curing that is difficult to receive oxygen inhibition when the ultraviolet curable ink is cured.

  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 amount of deviation between the center of the optical lens 17b in the light irradiation module 1 of the present embodiment in plan view and the center of the light emitting element 20 in plan view is constant in all the optical lenses 17b, but as shown in FIG. In addition, the amount of deviation between the center of the optical lens 17b in plan view and the center of the light emitting element 20 in plan view may gradually increase from the upstream side to the downstream side in the moving direction of the object. By setting it as such a structure, the peak of the illumination intensity of the moving direction with respect to a target object is located further in the upstream of the moving direction with respect to the target object of a light irradiation module, and hardening which cannot receive oxygen inhibition further is attained.

  Further, in the light irradiation module 1 of the present embodiment, there is one light emitting element 20 corresponding to the optical lens 17, but a plurality of light emitting elements 20 may be covered with one optical lens 17. In this case, the center of the optical lens 17b corresponding to the plurality of light emitting elements 20 in the plan view is positioned upstream of the moving direction of the object with respect to the center of the arrangement of the plurality of light emitting elements 20 in the plan view. What should I do?

  Here, as shown in FIGS. 7A to 7C, the center of arrangement refers to a centroid of a figure formed by connecting the centers of the light emitting elements located on the outer periphery among the plurality of light emitting elements. When a plurality of light emitting elements are regularly arranged as shown in FIGS. 7A to 7C and the light emission intensity from each light emitting element is equal, the center of the arrangement does not pass through the optical lens 17 of the plurality of light emitting elements. The peak position of the light emission intensity in this case substantially coincides with a plan view.

  When the arrangement of the plurality of light emitting elements is irregular or the light emission intensity between the light emitting elements is different, the projection point on the plurality of light emitting elements at the peak position of the light emission intensity may be considered as the center of the arrangement. .

  Similarly to the case where the number of the light emitting elements 20 corresponding to the optical lens 17b is one, the center of the optical lens 17b in the plan view and the center of the arrangement of the corresponding light emitting elements 20 in the plan view in the moving direction. It is preferable that the amount of deviation toward the upstream side gradually increases from the upstream side toward the downstream side in the moving direction.

  Further, as shown in FIGS. 8A and 8B, the center of the cross section in the plane direction of the optical lens 17b is located gradually upstream from the lower surface to the upper surface of the optical lens 17b. Also good. With such a configuration, the optical axis with respect to the normal line of the first main surface 11a with respect to the object is made while the center of the lower surface of the optical lens 17b and the center of the light emitting element 20 are substantially aligned in plan view. It can be tilted upstream in the direction of travel. Therefore, the optical axis can be tilted without shifting the center of the optical lens 17b from the center of the light emitting element 20, so that even when the light emitting element 20 and the optical lens 17b are mounted at a relatively high density, it can be efficiently performed. The optical axis of light emitted through the optical 17b of the optical element 20 can be tilted.

  Further, when one optical lens 17 covers the plurality of light emitting elements 20, the center of the cross section in the plane direction of the optical lens 17b is the lower surface of the optical lens 17b as shown in FIGS. 8 (a) and 8 (b). From the upper surface toward the upper surface (O1 → O2 → O3) may be located upstream in the moving direction.

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

  In the present embodiment, an example in which the light irradiation module 100 is applied to the printing apparatus 200 using the inkjet head 220 is shown, but the light irradiation module 100 cures, for example, a photo-curing resin spin-coated on the surface of the object. It can also be applied to the curing of various types of photo-curing resins such as dedicated devices. Moreover, you may use the light irradiation module 100 for the irradiation light source etc. in an exposure apparatus, for example.

DESCRIPTION OF SYMBOLS 1 Light irradiation module 10 Base | substrate 11a 1st main surface 12 Opening part 13 Connection pad 14 Inner peripheral surface 15 Bonding material 17 Optical lens 20 Light emitting element 21 Element substrate 22 Semiconductor layer 23, 24 Element electrode 30 Sealing material 40 Laminate body 41 One insulating layer 42 Second insulating layer 50 First adhesive 60 Heat transfer member 70 Second adhesive 110 Heat radiating member 200 Printing device 210 Transport mechanism 211 Mounting table 212 Transport roller 220 Inkjet head 220a Discharge hole 230 Control Mechanism 250 Recording medium

Claims (11)

A light irradiation device for irradiating light to a relatively moving object,
A base, a plurality of light emitting elements arranged vertically and horizontally on the upper surface of the base, and a plurality of lenses provided so as to cover the light emitting elements and for emitting light emitted from the light emitting elements to the outside And
The plurality of lenses includes a plurality of first lenses, and a plurality of second lenses located downstream of the first lens in the moving direction of the object with respect to the light irradiation device,
The light irradiation device, wherein an optical axis of light emitted through the second lens is inclined toward an upstream side in the moving direction with respect to a normal line of an upper surface of the substrate.   2. The light irradiation according to claim 1, wherein an inclination of an optical axis of light emitted through the plurality of second lenses gradually increases from an upstream side to a downstream side in the moving direction. device.   Each of the second lenses is provided corresponding to each of the light emitting elements, and the center of each of the second lenses in a plan view is in the moving direction with respect to the center of the corresponding light emitting element in a plan view. The light irradiation device according to claim 1, wherein the light irradiation device is located upstream.   Each of the second lenses is provided corresponding to each of the light emitting elements, and is upstream of the moving direction with respect to the center of each of the second lenses in plan view with respect to the center of the corresponding light emitting element in plan view. 4. The light irradiation device according to claim 3, wherein the amount of shift toward the surface gradually increases from the upstream side toward the downstream side in the moving direction.   Each of the second lenses is provided corresponding to a plurality of light emitting elements, and the center of each of the second lenses in a plan view is relative to the center of the arrangement of the corresponding plurality of light emitting elements in a plan view. The light irradiation device according to claim 1, wherein the light irradiation device is located upstream of the moving direction.   Each of the second lenses is provided so as to correspond to a plurality of light emitting elements, and the center of each of the second lenses in plan view is relative to the center of the arrangement of the corresponding plurality of light emitting elements in plan view. The light irradiation device according to claim 5, wherein the amount of deviation of the moving direction toward the upstream side gradually increases from the upstream side toward the downstream side in the moving direction.   2. The light irradiation according to claim 1, wherein the center of the cross section in the planar direction of the second lens is located gradually upstream from the lower surface to the upper surface of the second lens. device.   The deviation amount of the center of the cross section in the plane direction of the second lens from the lower surface to the upper surface of the second lens toward the upstream side in the moving direction gradually increases from the upstream side toward the downstream side in the moving direction. The light irradiation device according to claim 7, wherein:   9. The optical axis of light emitted through the first lens is parallel to the normal line of the upper surface of the substrate or inclined to the downstream side in the moving direction. The light irradiation device according to claim 1.   A light irradiation module, wherein a plurality of the light irradiation devices according to claim 1 are placed on a heat dissipation member. Printing means for printing on a recording medium;
11. A printing apparatus comprising: the light irradiation module according to claim 10 irradiating the printed recording medium with light.

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