JP2014192403A - Light irradiation device, light irradiation module and printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light irradiation device capable of extending a focal distance of light radiated from light-emitting elements and increasing irradiance even in a device in which a plurality of light-emitting elements are mounted on one substrate and a lens is provided so as to cover the plurality of light-emitting elements, respectively.SOLUTION: The light irradiation device comprises: a substrate 10A including an opening 12 on a top face 11a; light-emitting elements 20 disposed in the opening 12; a translucent member 30 encapsulating the light-emitting elements 20 and including a first protrusion 30a which protrudes in a normal direction of the top face 11a for converging light radiated from the light-emitting elements 20; and a lens member 16 which is disposed so as to cover the translucent member 30. Light radiated from the light-emitting elements 20 is radiated while being converged towards the lens member 16 by the translucent member 30 and further converged by the lens member 16. Thus, a focal distance of light radiated from the light-emitting elements 20 can be extended and irradiance can be increased.

Description

  The present invention relates to a light irradiation device, 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. In particular, the UV light source lamp light source used for curing UV curable resin used for bonding small parts in the field of electronic components and UV curable ink used for printing, etc. Mercury lamps and metal halide lamps are used.

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

  However, since the irradiance of the ultraviolet light emitting element is relatively low, for example, as described in Patent Document 1, a plurality of light emitting elements are mounted on one substrate so as to cover each of the plurality of light emitting elements. A device provided with a lens is used, thereby ensuring the ultraviolet irradiance necessary for curing the ultraviolet curable ink.

  However, in such a device, since the focal length of the light emitted from the light emitting element is short, (1) when incorporated in a resin curing device and a printing device, the ultraviolet curable resin and the ink and the device As a result, the device is contaminated and the ultraviolet irradiance is reduced. (2) To clean the contaminated device, the device is removed from the resin curing device and the printing device each time. (3) Depending on the shape and size of the transport mechanism attached to the resin curing device and printing device, etc., the light emitting element can determine the distance between the UV curable resin and ink and the device. If the irradiance on the resin curable resin and the ink surface becomes low as a result, the focal length of the irradiated light must be longer. There has been a Tsu was a problem.

JP 2010-219163 A

  The present invention has been made in view of the above problems, and even when a plurality of light emitting elements are mounted on one substrate and a lens is provided so as to cover each of the plurality of light emitting elements, It is an object of the present invention to provide a light irradiation device, a light irradiation module, and a printing apparatus that can increase the focal length of light emitted from a light emitting element and increase irradiance.

  The light irradiation device of the present invention includes a base having an opening on an upper surface, a light emitting element disposed in the opening, a first protrusion that seals the light emitting element and is convex in the normal direction of the upper surface It has a translucent member for condensing the light which the light emitting element irradiates, and a lens member arranged so as to cover the translucent member.

  Moreover, the light irradiation device of this invention is the said structure. WHEREIN: The said lens member is a biconvex lens, and is located in the 2nd convex part located in the said 1st convex part side, and the other side of the said 1st convex part. It has the 3rd convex part, It is characterized by the above-mentioned.

  Furthermore, the light irradiation device of the present invention is characterized in that, in the above configuration, the curvature value of the third convex portion is larger than the curvature value of the second convex portion.

  Moreover, the light irradiation device of the present invention is characterized in that, in the above configuration, the first convex portion, the second convex portion, and the third convex portion are located above the opening.

  Furthermore, in the light irradiation device of the present invention, in the above configuration, the first convex portion is accommodated in the opening, and at least a part of the second convex portion is located in the opening. It is characterized by.

  In the light irradiation device of the present invention, in the above-described configuration, a plurality of the openings are arranged on the upper surface of the base, and the light-transmissive member and the lens member are arranged in each of the openings. It is provided corresponding to each of the light emitting elements.

  Furthermore, in the light irradiation device of the present invention, in the above-described configuration, a plurality of the openings are disposed on the upper surface of the base, and the light-transmitting member is a light emitting element disposed in each of the openings. A plurality of lens members are provided so as to cover a plurality of the translucent members.

  Moreover, the light irradiation device of the present invention is characterized in that, in the above configuration, the lens member is a cylindrical lens.

  The light irradiation module of the present invention is characterized in that a plurality of the light irradiation devices of the present invention are mounted on a heat radiating member.

  A printing apparatus according to the present invention includes a printing unit that performs printing on a recording medium, and the light irradiation module according to the present invention that irradiates light onto the printed recording medium.

  According to the light irradiation device of the present invention, the base having an opening on the upper surface, the light emitting element disposed in the opening, the first light emitting element sealing the light emitting element and projecting in the normal direction of the upper surface. Since the light-emitting element includes a light-transmitting member having a convex portion for condensing the light irradiated by the light-emitting element and a lens member arranged to cover the light-transmitting member, the light-emitting element is sealed. The light that is emitted from the light emitting element by the translucent member that is stopped and protected is condensed and emitted toward the lens member, and is further focused by the lens member, and the focal point of the light that is emitted from the light emitting element. The distance can be increased and the irradiance can be increased.

It is a top view which shows the example of 1st Embodiment of the light irradiation device of this invention. It is sectional drawing along the 1I-1I line | wire of the light irradiation device shown in FIG. It is a top view which shows the example of 2nd Embodiment of the light irradiation device of this invention. It is sectional drawing along the 3I-3I line | wire of the light irradiation device shown in FIG. It is a top view which shows the light irradiation module using the light irradiation device shown in FIG. FIG. 6 is a cross-sectional view of the light irradiation module shown in FIG. 5 taken along line 5I-5I. It is a top view of the printing apparatus using the light irradiation module shown in FIG. It is a side view of the printing apparatus shown in FIG. It is a figure explaining the 1st modification of the light irradiation device shown in FIG. (A) And (b) is a figure explaining the 2nd modification of the light irradiation device shown in FIG. It is a figure explaining the 3rd modification of the light irradiation device shown in FIG. It is a figure explaining the 4th modification of the light irradiation device shown in FIG. (A) is sectional drawing along the 12I-12I line | wire shown in FIG. FIG. 13B is a sectional view taken along line 12II-12II shown in FIG.

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

(First Embodiment of Light Irradiation Device)
The example of 1st Embodiment of the light irradiation device of this invention is demonstrated. FIG. 1 is a plan view of the light irradiation device 1A of this example, and FIG. 2 is a cross-sectional view taken along line 1I-1I of the light irradiation device 1A shown in FIG.

  The light irradiation device 1A of this example is incorporated in a printing apparatus such as an offset printing apparatus or an ink jet printing apparatus that uses ultraviolet curable ink, and after the ultraviolet curable ink is deposited on an object (recording medium), ultraviolet light is applied. By irradiating, it functions as an ultraviolet light generating light source for curing the ultraviolet curable ink.

  The light irradiation device 1A includes a base 10A having an opening 12 on the upper surface 11a, a light emitting element 20 disposed in the opening 12, and the first light emitting element 20 that is sealed in the normal direction of the upper surface 11a. It has the translucent member 30 which has the convex part 30a for condensing the light which the light emitting element 20 irradiates, and the lens member 16 arrange | positioned so that the translucent member 30 may be covered.

  10 A of base | substrates are provided with the laminated body 40 by which the 1st insulating layer 41 and the 2nd insulating layer 42 were laminated | stacked, and the electrical wiring 50 which connects the light emitting element 20 and an external power supply, planarly viewed from the upper surface 11a side The light emitting element 20 is supported in the opening 12 provided in the upper surface 11a. The base 10A has an opening 12 for accommodating the light emitting element 20 on the upper surface 11a. In addition, although the shape of 10 A of base | substrates of this example is a rectangular shape, it is not limited to this. In this example, one light emitting element 20 is supported in the opening 12, but a plurality of light emitting elements 20 may be supported.

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

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

  In the second insulating layer 42 laminated on the first insulating layer 41, the opening 12 penetrating the second insulating layer 42 is formed.

  The shape of each opening 12 is such that the inner peripheral surface 14 is inclined so that the hole diameter is larger on the upper surface 11a side of the base body 10A than the mounting surface of the light emitting element 20, and when viewed in plan, for example, circular It is the shape of. The opening shape is not limited to a circular shape, and may be a rectangular shape.

  Such an opening 12 has a function as a reflector that reflects light emitted from the light emitting element 20 upward on the inner peripheral surface 14 and improves the 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.

  The base 10A provided with the laminated body 40 composed of the first insulating layer 41 and the second insulating layer 42 as described above is manufactured through the following steps if it is made of ceramics or the like.

  First, a plurality of ceramic green sheets manufactured by a conventionally known method are prepared. A hole corresponding to the opening 12 is formed in the ceramic green sheet corresponding to the opening 12 by a method such as punching or laser processing. Next, after printing (not shown) a metal paste to be the electric wiring 50 on the green sheet, the green sheets are laminated so that the printed metal paste is positioned between the green sheets. Examples of the metal paste used for the electric wiring 50 include a paste containing a metal such as tungsten (W), molybdenum (Mo), manganese (Mn), and copper (Cu). Next, the base body 10A having the electrical wiring 50 and the opening 12 can be formed by firing the laminate and firing the green sheet and the metal paste together.

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

  First, a precursor sheet of a thermosetting resin is prepared. Next, a plurality of precursor sheets are laminated so that lead terminals made of a metal material to be the electrical wiring 50 are arranged between the precursor sheets and the lead terminals are embedded in the precursor sheets. Examples of the material for forming the lead terminal include copper (Cu), silver (Ag), aluminum (Al), iron (Fe) -nickel (Ni) -cobalt (Co) alloy, and iron (Fe) -nickel (Ni). Examples include metal materials such as alloys. 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 10A is completed by thermosetting this. In addition, when forming the opening part 12 by laser processing, you may process after thermosetting a precursor sheet | seat.

  On the other hand, in the opening 12 of the base body 10A, a plurality of connection pads 13 electrically connected to the light emitting element 20 and bonding of solder, gold (Au) wire, aluminum (Al) wire, etc. to the connection pad 13 are provided. A light emitting element 20 connected by a material 15 is 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, and aluminum (Al) wire.

  The light emitting element 20 is a light emitting element in which a p-type semiconductor layer and an n-type semiconductor layer made of a semiconductor material such as gallium arsenide (GaAs) or gallium nitride (GaN) are stacked on an element substrate 21 such as a sapphire substrate. A diode or a semiconductor layer is composed of an organic EL element made of an organic material.

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

  In this example, an LED that emits UV light having a wavelength peak of light of 280 to 440 nm, for example, is employed. That is, in this example, a UV-LED element is adopted as the light emitting element 20. The light emitting element 20 is formed by a conventionally known thin film forming technique.

  The light emitting element 20 is sealed with a translucent member 30.

  The light transmissive member 30 is made of an insulating material such as a light transmissive resin material. The light-emitting element 20 is well sealed to prevent moisture from entering from the outside, or from an external impact. Or the like, and has a function of protecting the light emitting element 20. In addition, the material of the translucent member 30 of this example is formed of silicone resin.

  Moreover, the translucent member 30 of this example has the 1st convex part 30a convex in the normal line direction of the upper surface 11a, and also has the function for condensing the light which the light emitting element 20 irradiates. Have. That is, the 1st convex part 30a is provided corresponding to the light emitting element 20, and the cross-sectional area becomes small gradually from the light emitting element 20 side along the normal line direction of the upper surface 11a. The first convex portion 30 a of this example is accommodated in the opening 12.

  Note that a material having a refractive index between the refractive index of the element substrate 21 constituting the light emitting element 20 (in the case of sapphire: 1.7) and the refractive index of air (about 1.0) is applied to the translucent member 30. For example, by using a silicone resin (refractive index: about 1.4) or the like, the light extraction efficiency of the light emitting element 20 can be improved.

  The lens member 16 is disposed so as to cover the light emitting element 20, and has a function of condensing light emitted from the light emitting element 20 through the translucent member 30.

  The lens member 16 of this example is a biconvex lens, and includes a second convex portion 16a located on the first convex portion 30a side and a third convex portion 16b located on the opposite side of the first convex portion 30a. The biconvex lens as the lens member 16 is provided so as to cover the light emitting element 20 and is supported by a film-like connecting member 18 having a through hole at a position corresponding to the light emitting element 20.

  The connecting member 18 and the base body 10 </ b> A are fixed via a fixing member 19. The fixing member 19 in this example is a frame-like member disposed along the outer periphery of the connecting member 18. That is, the lens member 16 is connected to the upper surface 11a of the base body 10A via the connecting member 18 and the fixing member 19.

  The 2nd convex part 16a is arranged corresponding to light emitting element 20 in the 1st principal surface 17a side located in the 1st convex part 30a side among the principal surfaces of connecting member 18, and the 3rd convex part 16b is It arrange | positions corresponding to the 1st convex part 30a in the 2nd main surface 17b side located in the other side of the 1st main surface 17a among the main surfaces of the connection member 18. As shown in FIG.

  The second convex portion 16a and the third convex portion 16b in this example have the same curvature value. In addition, the second convex portion 16a and the third convex portion 16b in this example are located above the opening 12, and there is a gap between the first convex portion 30a and the second convex portion 16a. If the desired light condensing characteristic is obtained, the first convex portion 30a and the second convex portion 16a may be in contact with each other.

  Examples of the material of the lens member 16 include glass and resin. Resin is preferable from the viewpoint of mass productivity. As the resin, acrylic, epoxy, polyester, polycarbonate, styrene, and vinyl chloride are optically preferable. Further, these resin materials include photocuring, photodissolving, thermosetting, and thermoplastic. There are types, etc., which can be appropriately selected depending on the manufacturing method of the lens member 16. As a manufacturing method of the lens member 16, a casting method using a mold, a hot press molding, an injection molding, a printing method, or a photolithography method is preferable from the viewpoint of productivity.

  Specifically, it can be molded by heat pressing a thermoplastic resin with a lens member-shaped mold. Moreover, it can be molded by filling a mold with a photocurable resin or a thermosetting resin, then curing the resin with light or heat, and removing it from the mold. As a photolithography method, ultraviolet light (or visible light) is exposed through a light-shielding mask appropriately patterned on a light-dissolving resin or a photo-curable resin, and dissolution development is performed on an exposed portion or unexposed portion, respectively. Formed by. It is possible to obtain a lens member having a desired shape according to the resin material and the exposure dose distribution. Depending on the resin material, a high-humidity bake treatment can be performed after development, and a lens member having a desired shape can be obtained by surface tension during thermal softening.

  The connecting member 18 and the fixing member 19 in this example are made of the same material as the lens member 16, and the lens member 16, the connecting member 18, and the fixing member 19 in this example are integrated by the above-described manufacturing method of the lens member 16. Is formed. In the case of this example, the lens member 16, the connecting member 18, and the fixing member 19 are made of silicone resin.

  Note that the material of the connecting member 18 and the fixing member 19 is not necessarily the same as the material of the lens member 16, and any material can be selected as long as it can support the lens member 16 and fix the connecting member 18 to the base body 10A. May be. In this case, the lens member 16 and the connecting member 18, the connecting member 18 and the fixing member 19, and the fixing member 19 and the base body 10A may be bonded via an adhesive.

  As described above, in the light irradiation device 1 </ b> A of this example, the light irradiated from the light emitting element 20 is condensed and irradiated toward the lens member 16 by the translucent member 30 that seals and protects the light emitting element 20. Further, by condensing the light with the lens member 16, the focal length of the light emitted from the light emitting element 20 can be increased and the irradiance can be increased.

Here, the irradiance is the intensity of light per unit area on the object, and a conventionally well-known measurement may be performed by installing a light receiving unit of an ultraviolet illuminometer on the object. Irradiance is also called light intensity per unit area, and W / cm ² or the like is used as a unit.

Moreover, since the translucent member 30 has a function as a sealing material for the light emitting element 20 and a light collecting member for condensing the light emitted from the light emitting element 20, the number of components can be reduced. This contributes to the reduction of the manufacturing process and the manufacturing cost of the light irradiation device 1A and contributes to the thinning of the light irradiation device 1A.

(Example of second embodiment of light irradiation device)
The example of 2nd Embodiment of the light irradiation device of this invention is demonstrated. FIG. 3 is a plan view of the light irradiation device 1B of this example, and FIG. 4 is a cross-sectional view taken along the line 3I-3I of the light irradiation device 1B shown in FIG. The configuration of the light irradiation device 1B of this example is the same as that of the light irradiation device 1A that is an example of the first embodiment, except that the base 10B is provided instead of the base 10A. In the following, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof may be omitted.

  The light irradiation device 1B of this example is incorporated in a printing apparatus such as an offset printing apparatus or an ink jet printing apparatus that uses ultraviolet curable ink, and after the ultraviolet curable ink is deposited on an object (recording medium), ultraviolet light is applied. By irradiating, it functions as an ultraviolet light generating light source for curing the ultraviolet curable ink.

  The light irradiation device 1B includes a base body 10B having a plurality of openings 12 on the upper surface 11a, a plurality of connection pads 13 provided in each opening 12, and a connection pad disposed in each opening 12 of the base body 10B. A plurality of light emitting elements 20 electrically connected to the light emitting element 20, and a light emitting element 20 that seals each of the plurality of light emitting elements 20 and has first convex portions 30a that are convex in the normal direction of the upper surface 11a. It has the some translucent member 30 for condensing the light to irradiate, and the some lens member 16 arrange | positioned so that each of the some translucent member 30 may be covered. That is, the translucent member 30 and the lens member 16 are provided corresponding to each of the light emitting elements 20 disposed in each of the openings 12. In FIG. 3, the opening 12 is omitted.

  The base body 10B includes a laminated body 40 in which the first insulating layer 41 and the second insulating layer 42 are laminated, and the electric wiring 50 that connects the light emitting elements 20 to each other and between the light emitting elements 20 and an external power source, and is on the upper surface 11a side. The plurality of light emitting elements 20 are supported in the opening 12 provided on the upper surface 11a. The base body 10B has a plurality of openings 12 that accommodate the light emitting elements 20 on the upper surface 11a of the base body 10B. In addition, although the shape of the base | substrate 10B of this example is a rectangular shape, it is not limited to this. In this example, one light emitting element 20 is supported in the opening 12, but a plurality of light emitting elements 20 may be supported.

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

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

  In the second insulating layer 42 laminated on the first insulating layer 41, the opening 12 penetrating the second insulating layer 42 is formed.

  The shape of each opening 12 is such that the inner peripheral surface 14 is inclined so that the hole diameter is larger on the upper surface 11a side of the base body 10B than the mounting surface of the light emitting element 20, and when viewed in plan, for example, circular It is the shape of. The opening shape is not limited to a circular shape, and may be a rectangular shape.

  Such an opening 12 has a function as a reflector that reflects light emitted from the light emitting element 20 upward on the inner peripheral surface 14 and improves the 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 upper surface of the base body 10B, that is, the entire upper surface 11a. In this example, they are arranged in a lattice pattern.

  When it is desired to increase the irradiance per unit area, it may be arranged in a staggered pattern, and there is no need to limit the arrangement. By arranging in a zigzag pattern, that is, by arranging a plurality of rows in a zigzag pattern, the light emitting elements 20 can be arranged at high density. Here, to arrange in a zigzag pattern is synonymous with the arrangement so as to be positioned at the lattice points of the diagonal lattice.

  The base body 10B having the laminate 40 composed of the first insulating layer 41 and the second insulating layer 42 as described above is as follows if 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 are prepared. A hole corresponding to the opening 12 is formed in the ceramic green sheet corresponding to the opening 12 by a method such as punching or laser processing. Next, after printing (not shown) a metal paste to be the electric wiring 50 on the green sheet, the green sheets are laminated so that the printed metal paste is positioned between the green sheets. Examples of the metal paste used for the electric wiring 50 include a paste containing a metal such as tungsten (W), molybdenum (Mo), manganese (Mn), and copper (Cu). Next, the laminate 10B is fired, and the green sheet and the metal paste are fired together, whereby the base body 10B having the electrical wiring 50 and the opening 12 can be formed.

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

  First, a precursor sheet of a thermosetting resin is prepared. Next, a plurality of precursor sheets are laminated so that lead terminals made of a metal material to be the electrical wiring 50 are arranged between the precursor sheets and the lead terminals are embedded in the precursor sheets. Examples of the material for forming the lead terminal include copper (Cu), silver (Ag), aluminum (Al), iron (Fe) -nickel (Ni) -cobalt (Co) alloy, and iron (Fe) -nickel (Ni). Examples include metal materials such as alloys. 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 10B is completed by thermosetting this. In addition, when forming the opening part 12 by laser processing, you may process after thermosetting a precursor sheet | seat.

  On the other hand, in the opening 12 of the base body 10B, a plurality of connection pads 13 electrically connected to the light emitting element 20, and bonding of solder, gold (Au) wires, aluminum (Al) wires, etc. to the connection pads 13 are performed. A plurality of light emitting elements 20 connected by the material 15 are provided.

The connection pad 13 is made of, for example, tungsten (W), molybdenum (Mo), manganese (M
n) and a metal layer made of a metal material such as 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, and aluminum (Al) wire.

  The light emitting element 20 is a light emitting element in which a p-type semiconductor layer and an n-type semiconductor layer made of a semiconductor material such as gallium arsenide (GaAs) or gallium nitride (GaN) are stacked on an element substrate 21 such as a sapphire substrate. A diode or a semiconductor layer is composed of an organic EL element made of an organic material.

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

  In this example, an LED that emits UV light having a wavelength peak of light of 280 to 440 nm, for example, is employed. That is, in this example, a UV-LED element is adopted as the light emitting element 20. The light emitting element 20 is formed by a conventionally known thin film forming technique.

  Each of the plurality of light emitting elements 20 is sealed with a plurality of light transmissive members 30. That is, the translucent member 30 is provided corresponding to each of the light emitting elements 20 disposed in each of the openings 12.

  The light transmissive member 30 is made of an insulating material such as a light transmissive resin material. The light-emitting element 20 is well sealed to prevent moisture from entering from the outside, or from an external impact. Or the like, and has a function of protecting the light emitting element 20. In addition, the material of the translucent member 30 of this example is formed of silicone resin.

  Moreover, the translucent member 30 of this example has the 1st convex part 30a convex in the normal line direction of the upper surface 11a, and also has the function for condensing the light which the light emitting element 20 irradiates. Have. That is, the first convex portions 30a are provided corresponding to the light emitting elements 20, respectively, and the cross-sectional area gradually decreases from the light emitting element 20 side along the normal direction of the upper surface 11a. The first convex portions 30a of this example are accommodated in the openings 12 respectively.

  Note that a material having a refractive index between the refractive index of the element substrate 21 constituting the light emitting element 20 (in the case of sapphire: 1.7) and the refractive index of air (about 1.0) is applied to the translucent member 30. For example, by using a silicone resin (refractive index: about 1.4) or the like, the light extraction efficiency of the light emitting element 20 can be improved.

  The lens member 16 is disposed so as to cover the whole of the plurality of light emitting elements 20 and has a function of condensing light emitted from the plurality of light emitting elements 20 via the translucent member 30.

The lens member 16 of this example is a plurality of biconvex lenses corresponding to each of the plurality of light emitting elements 20, and each of the second convex portion 16a located on the first convex portion 30a side and the opposite side of the first convex portion 30a. And the third convex portion 16b. The plurality of biconvex lenses as the lens member 16 are provided so as to cover the whole of the plurality of light emitting elements 20 and are supported by a film-like connecting member 18 having a through hole at a position corresponding to the light emitting elements 20. The connecting member 18 and the base body 10 </ b> B are fixed via a fixing member 19.

  The 2nd convex part 16a is arranged corresponding to light emitting element 20 in the 1st principal surface 17a side located in the 1st convex part 30a side among the principal surfaces of connecting member 18, and the 3rd convex part 16b is It arrange | positions corresponding to the 1st convex part 30a in the 2nd main surface 17b side located in the other side of the 1st main surface 17a among the main surfaces of the connection member 18. As shown in FIG.

  The second convex portion 16a and the third convex portion 16b in this example have the same curvature value. In addition, the second convex portion 16a and the third convex portion 16b in this example are located above the opening 12, and there is a gap between the first convex portion 30a and the second convex portion 16a. If the desired light condensing characteristic is obtained, the first convex portion 30a and the second convex portion 16a may be in contact with each other.

  The fixing member 19 in this example is a frame-like member disposed along the outer periphery of the connecting member 18. The lens member 16 is bonded to the upper surface 11a of the base body 10B through the connecting member 18 and the fixing member 19 with an adhesive.

  Examples of the material of the lens member 16 include glass and resin. Resin is preferable from the viewpoint of mass productivity. As the resin, acrylic, epoxy, polyester, polycarbonate, styrene, and vinyl chloride are optically preferable. Further, these resin materials include photocuring, photodissolving, thermosetting, and thermoplastic. There are types, etc., which can be appropriately selected depending on the manufacturing method of the lens member 16. As a manufacturing method of the lens member 16, a casting method using a mold, a hot press molding, an injection molding, a printing method, or a photolithography method is preferable from the viewpoint of productivity.

  Specifically, it can be molded by heat pressing a thermoplastic resin with a lens member-shaped mold. Moreover, it can be molded by filling a mold with a photocurable resin or a thermosetting resin, then curing the resin with light or heat, and removing it from the mold. As a photolithography method, ultraviolet light (or visible light) is exposed through a light-shielding mask appropriately patterned on a light-dissolving resin or a photo-curable resin, and dissolution development is performed on an exposed portion or unexposed portion, respectively. Formed by. It is possible to obtain a lens member having a desired shape according to the resin material and the exposure dose distribution. Depending on the resin material, a high-humidity bake treatment can be performed after development, and a lens member having a desired shape can be obtained by surface tension during thermal softening.

  The connecting member 18 and the fixing member 19 of this example are made of the same material as the lens member 16, and the lens member 16, the connecting member 18 and the fixing member 19 of this example are integrally formed. In the case of this example, the lens member 16, the connecting member 18, and the fixing member 19 are made of silicone resin.

  Note that the material of the connecting member 18 and the fixing member 19 is not necessarily the same as the material of the lens member 16, and any material can be selected as long as it can support the lens member 16 and fix the connecting member 18 to the base body 10B. May be. In this case, the lens member 16 and the connecting member 18, the connecting member 18 and the fixing member 19, and the fixing member 19 and the base body 10A may be bonded via an adhesive.

As described above, in the light irradiation device 1B of this example, the light emitted from each of the light emitting elements 20 is condensed and irradiated toward the lens member 16 by the translucent member 30 that seals and protects the light emitting elements 20. Further, by condensing light by each of the biconvex lenses of the lens member 16, the focal length of the light emitted from the light emitting element 20 can be increased and the irradiance can be increased.

Here, the irradiance is the intensity of light per unit area on the object, and a conventionally well-known measurement may be performed by installing a light receiving unit of an ultraviolet illuminometer on the object. Irradiance is also called light intensity per unit area, and W / cm ² or the like is used as a unit.

  Moreover, since the translucent member 30 has a function as a sealing material for the light emitting element 20 and a light collecting member for condensing the light emitted from the light emitting element 20, the number of components can be reduced. This contributes to the reduction of the manufacturing process and the manufacturing cost of the light irradiation device 1B and contributes to the thinning of the light irradiation device 1B.

(Light irradiation module)
As shown in FIGS. 5 and 6, the light irradiation module 2 of this example includes a heat radiating member 110 and a plurality of light irradiation devices 1 </ b> A arranged on the heat radiating member 110. The device 1A is placed on the main surface of the heat dissipation member 110 via an adhesive 120 such as silicone resin or epoxy resin. In this example, three light irradiation devices 1A are arranged in a row. Needless to say, the light irradiation device 1B can be used instead of the light irradiation device 1A.

  The heat radiating member 110 functions as a support for the light irradiation device 1A and as a heat radiating body for radiating heat generated by the light irradiation device 1A to the outside. 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 in this example is made of copper.

  According to the light irradiation module 2 of this example, the above-described effects of the light irradiation device 1A can be achieved.

(Printer)
As an example of the embodiment of the printing apparatus of the present invention, the printing apparatus 200 shown in FIGS. 7 and 8 will be described as an example. The printing apparatus 200 includes a conveying unit 210 for conveying the recording medium 250, a printing unit 220 as a printing mechanism for printing on the conveyed recording medium 250, and an ultraviolet ray for the recording medium 250 after printing. The light irradiation module 2 that irradiates light and the control mechanism 230 that controls the light emission of the light irradiation module 2 are provided. The recording medium 250 corresponds to the above-described object.

  The transport unit 210 is for transporting the recording medium 250 so as to pass through the printing unit 220 and the light irradiation module 2 in this order. The transport unit 210 and the mounting table 211 are arranged so as to face each other and are rotatably supported. And a roller 212. The transport unit 210 is for sending the recording medium 250 supported by the mounting table 211 between the pair of transport rollers 212 and rotating the transport roller 212 to feed the recording medium 250 in the transport direction. .

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

  In this example, a line-type printing unit is employed as the printing unit 220. The printing unit 220 has a plurality of ejection holes 220a arranged in a line in the main scanning direction, and is configured to eject ultraviolet curable ink from the ejection holes 220a. The printing unit 220 ejects ink from the ejection holes 220a and deposits the ink on the recording medium with respect to the recording medium 250 conveyed in a direction (sub-scanning direction) orthogonal to the arrangement of the ejection holes 220a. Thus, printing is performed on the recording medium.

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

  In the printing apparatus 200, the light irradiation module 2 has a function of exposing the photosensitive material attached to the recording medium 250 conveyed via the conveying unit 210. The light irradiation module 2 is provided on the downstream side in the transport direction with respect to the printing unit 220. In the printing apparatus 200, the light emitting element 20 has a function of exposing the photosensitive material attached to the recording medium 250.

  The control mechanism 230 has a function of controlling the light emission of the light irradiation module 2. The memory of the control mechanism 230 stores information indicating the characteristics of light that makes it relatively good to cure the ink droplets ejected from the printing unit 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 this example, by including the control mechanism 230, the magnitude of the drive current input to the plurality of light emitting elements 20 can be adjusted based on the stored information of the control mechanism 230. From this, according to the printing apparatus 200 of this example, it is possible to irradiate light with an appropriate ultraviolet irradiance according to the characteristics of the ink used, and to cure the ink droplets with relatively low energy light. it can.

  In the printing apparatus 200, the transport unit 210 transports the recording medium 250 in the transport direction. The printing unit 220 discharges the 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 2 to cure the ultraviolet curable ink.

  According to the printing apparatus 200 of this example, the above-described effects of the light irradiation module 2 can be achieved.

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

  For example, as in the first modification shown in FIG. 9, the curvature value of the third convex portion 16b of the lens member 16 of the light irradiation device 1A may be larger than the curvature value of the second convex portion 16a. With such a configuration, it is possible to increase the focal length of the light emitted from the light emitting element 20 and increase the irradiance.

  Moreover, like the 2nd modification shown to Fig.10 (a), (b), the 1st convex part 30a which the translucent member 30 of 1 A of light irradiation devices has, the 2nd convex part 16a which the lens member 16 has, and The third convex portion 16 b may be located above the opening 12. By setting it as such a structure, the focal distance of the light which the light emitting element 20 irradiates can be lengthened.

  Further, as shown in FIG. 10B, the first convex portion 30 a of the translucent member 30 may be arranged on the support member 30 b in the same manner as the lens member 16. In this case, the translucent member 30 and the support member 30b may be bonded with a resin adhesive which is the same material as the translucent member 30 and the support member 30b. In the case of the second modification, since the lens member 16, the connecting member 18, and the fixing member 19 are formed of silicone resin, the translucent member 30 and the support member 30b are bonded with a silicone resin adhesive. . By setting it as such a structure, while being able to make the curvature value of the 1st convex part 30a into a desired value stably also in mass production of 1 A of light irradiation devices, preparing the 1st convex part 30a previously. Therefore, the manufacturing process of the light irradiation device 1A can be simplified.

  Further, as in the third modified example shown in FIG. 11, the first convex portion 30 a included in the light transmissive member 30 of the light irradiation device 1 </ b> A is accommodated in the opening 12, and the second convex portion included in the lens member 16. At least a part of 16 a may be located in the opening 12. With this configuration, all of the light emitted from the light emitting element 20 is emitted through the lens member 16, so that the focal length of the light emitted from the light emitting element 20 can be increased. In addition, since the light emitted from the light emitting element 20 can be efficiently extracted, the radiation intensity of the light emitted from the light emitting element 20 per unit area can be increased.

  The description of the modified example is a modified example of the light irradiation device 1A that is an example of the first embodiment, but of course, the light irradiation device 1B that is an example of the second embodiment. Is also applicable.

  Moreover, like the 4th modification shown in FIG. 12, FIG. 13 (a), (b), the light transmissive member 30 of the light irradiation device 1B is set to each of the light emitting element 20 arrange | positioned at each of the opening part 12. As shown in FIG. A plurality of lens members 16 may be provided so as to cover a plurality of translucent members 30. The lens member 16 of the fourth modification includes a plurality of biconvex cylindrical lenses each having a second convex portion 16 a and a third convex portion 16 b on both surfaces of the connecting member 18. The biconvex cylindrical lens is disposed so as to cover the plurality of first convex portions 30a of the plurality of light emitting elements 20 arranged in a row, that is, the plurality of light-transmissive members 30 arranged in a row. And the biconvex cylindrical lens is arrange | positioned corresponding to the row | line | column of each some 1st convex part 30a. The optical axis of the biconvex cylindrical lens is along the direction of arrangement of the plurality of light emitting elements 20 arranged in a line, that is, the plurality of translucent members 30 arranged in a line. In FIG. 12, the opening 12 is omitted.

  By adopting such a configuration, it is possible to reduce variations in irradiance distribution in the column direction in which the plurality of light emitting elements 20 are arranged.

  In the fourth modification, the biconvex cylindrical lens as the lens member 16 is provided so as to cover the plurality of light emitting elements 20 arranged in a line, but the first convex portion 30a of the translucent member 30 is provided on the upper surface. The shape of a plano-convex cylindrical lens convex in the normal direction of 11a may be used.

  Moreover, in the light irradiation module 2, you may provide the biconvex cylindrical lens as the lens member 16 so that the several light emitting element 20 arranged in a line may be covered. That is, the lens member 16 may be disposed across the plurality of light irradiation devices 1A and 1B.

  In addition, although not illustrated, the example of the embodiment of the light irradiation module 2 is not limited to the above example. For example, in the example illustrated in FIG. 6, the three light irradiation devices 1 </ b> A are arranged in a row, but one light irradiation device 1 </ b> A or 1 </ b> B may be arranged on the main surface of the heat dissipation member 110. A plurality of light irradiation devices 1A or 1B may be arranged in a plurality of rows.

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

  In the example of the above-described embodiment, an example in which the light irradiation module 2 is applied to the printing apparatus 200 using the inkjet head 220 is shown. This light irradiation module 2 is, for example, photocuring by spin-coating the object surface. The present invention can also be applied to curing various types of photo-curing resins such as a dedicated device for curing the resin. Moreover, you may use the light irradiation module 2 for the irradiation light source etc. in an exposure apparatus, for example.

  Needless to say, the light irradiation devices 1 </ b> A and 1 </ b> B may be applied instead of applying the light irradiation module 2 to the printing apparatus 200.

1A, 1B Light irradiation device 2 Light irradiation modules 10A, 10B Base 11a Upper surface 12 Opening portion 13 Connection pad 14 Inner peripheral surface 15 Bonding material 16 Lens member 16a Second convex portion 16b Third convex portion 17a First main surface 17b Second Main surface 18 Connecting member 19 Fixing member 20 Light emitting element 21 Element substrate 22 Semiconductor layers 23 and 24 Element electrode 30 Translucent member 30a First protrusion 30b Support member 40 Laminate body 41 First insulating layer 42 Second insulating layer 50 Electricity Wiring 110 Heat radiating member 120 Adhesive 200 Printing device 210 Conveying means 211 Mounting table 212 Conveying roller 220 Printing means 220a Discharge hole 230 Control mechanism 250 Recording medium

Claims (10)

  A light emitting device comprising: a base having an opening on an upper surface; a light emitting element disposed in the opening; and a first convex portion that seals the light emitting element and is convex in a normal direction of the upper surface. A light irradiating device comprising: a light transmissive member for condensing light to be irradiated; and a lens member disposed so as to cover the light transmissive member.   The said lens member is a biconvex lens, and has a 2nd convex part located in the said 1st convex part side, and a 3rd convex part located in the other side of the said 1st convex part. 2. The light irradiation device according to 1.   The light irradiation device according to claim 2, wherein the curvature value of the third convex portion is larger than the curvature value of the second convex portion.   4. The light irradiation device according to claim 2, wherein the first convex portion, the second convex portion, and the third convex portion are located above the opening. 5.   The said 1st convex part is accommodated in the said opening part, The said 2nd convex part is located in the said opening part at least partially, The light irradiation of Claim 2 or 3 characterized by the above-mentioned. device. A plurality of the openings are arranged on the upper surface of the base body,
The said translucent member and the said lens member are provided corresponding to each of the said light emitting element arrange | positioned at each of the said opening part, The any one of Claim 1 thru | or 5 characterized by the above-mentioned. Light irradiation device. A plurality of the openings are arranged on the upper surface of the base body,
The translucent member is provided corresponding to each of the light emitting elements disposed in each of the openings,
The light irradiation device according to claim 1, wherein a plurality of the lens members are provided so as to cover a plurality of the translucent members.   The light irradiation device according to claim 7, wherein the lens member is a cylindrical lens.   A light irradiation module comprising a plurality of the light irradiation devices according to claim 1 mounted on a heat dissipation member. Printing means for printing on a recording medium;
A printing apparatus comprising: the light irradiation module according to claim 9, which irradiates light onto the printed recording medium.

Images