JP2011046022A - Ultraviolet irradiation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact ultraviolet irradiation device in which the length in the moving direction of a printing object is made shorter. <P>SOLUTION: The ultraviolet irradiation device is attached adjacent to a printing head jetting ultraviolet-curing type ink of a printing apparatus, and irradiates ultraviolet light by the power supplied from the commercial power source to cure the ultraviolet-curing type ink. The ultraviolet irradiation device includes a plurality of light emitting modules 1 and headers 2 juxtaposed in the direction of the plurality of light emitting modules 1 orthogonal to the moving direction of the printing object. The light emitting module 1 includes an ultraviolet light emitting diode 11, a base block 13 and a cover block 14 electrically connected to both side electrodes of the ultraviolet light emitting diode 11 respectively, on two side faces facing in the moving direction. The base block 13 and cover block 14 of the adjacent light emitting modules 1 are connected to each other via conductive connection plates 3 at the side faces of the light emitting modules 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an ultraviolet irradiation device that irradiates ultraviolet curable ink with ultraviolet rays.

  2. Description of the Related Art Conventionally, an inkjet printing apparatus using an ultraviolet curable ink that is cured by irradiation with ultraviolet rays has been proposed. In this type of ink jet printing apparatus, an ultraviolet ray that irradiates the ink deposited on the print object adjacent to the print head that ejects the ultraviolet curable ink as fine ink droplets onto the print object such as paper. An irradiation device is provided.

  In this type of ultraviolet irradiation device, a light emitting diode (LED-UV) having an emission wavelength in the ultraviolet region is used as a light source. In order to ensure the ultraviolet intensity necessary for curing the ultraviolet curable ink, a plurality of light emitting diodes are used. The light emitting diodes are arranged in a straight line in a direction orthogonal to the moving direction of the printing object (for example, Patent Document 1).

  In a semiconductor device that is an ultraviolet irradiation device described in Patent Document 1, a plurality of packages are arranged side by side in a direction perpendicular to the moving direction of a printing object on the surface of a header through which a cooling fluid passes. Each package includes an ultraviolet light emitting diode that emits ultraviolet light, a substrate to which one electrode of the ultraviolet light emitting diode is connected, and a cover that is stacked on the substrate via an insulating layer and to which the other electrode of the ultraviolet light emitting diode is connected. A substrate. Here, in two adjacent packages, one substrate and the other cover substrate are electrically connected to each other by a metal connection plate, whereby the ultraviolet light emitting diodes of the plurality of packages are connected in series. Further, by connecting a power source to the packages arranged at both ends of the header, each ultraviolet light emitting diode emits light and is irradiated with ultraviolet rays.

JP 2009-65127 A

  By the way, this type of ultraviolet curing device is required to be miniaturized in order to save space of the entire printing apparatus.

  However, in the above-described ultraviolet irradiation device, the connection plates are connected to both sides of the ultraviolet light-emitting diode of the package, and the adjacent packages are electrically connected. It is necessary for the surface of the substrate on which the diode is mounted, and the length of the package in the moving direction of the printing object is increased, making it difficult to reduce the size of the ultraviolet irradiation device.

  The present invention has been made in view of the above-described reasons, and an object thereof is to provide a small ultraviolet illumination device by shortening the length of the printing object in the moving direction.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided an ultraviolet irradiation device for curing an ultraviolet curable ink by irradiating an ultraviolet curable ink placed on a printing object by irradiating the ultraviolet ray. The light emitting module includes a plurality of light emitting modules arranged in a direction orthogonal to the moving direction of the object, and each light emitting module includes a light emitting element having a light emission wavelength in an ultraviolet region on a front surface and two side surfaces facing each other in the moving direction. And a terminal portion electrically connected to both side electrodes of the light emitting element, and a conductive connecting portion for electrically connecting the terminal portions of the plurality of light emitting modules on the side surface side.

  According to the first aspect of the present invention, the conductive connection part that electrically connects the adjacent light emitting modules is provided on the two side surfaces facing each other in the moving direction of the printing object, so that the length of the ultraviolet irradiation device in the moving direction is increased. Therefore, a small ultraviolet irradiation device can be provided. Moreover, since the length of the ultraviolet irradiation device in the moving direction is shortened, the light emitting modules can be arranged in a plurality of rows along the moving direction of the printing object.

It is a schematic sectional drawing which shows the principal part of the ultraviolet irradiation device concerning embodiment of this invention. It is a schematic front view which shows the principal part of the ultraviolet irradiation device.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the following description, the top and bottom in FIG. 1 are the top and bottom of the ultraviolet irradiation device, and the top and bottom and left and right in FIG.

  As shown in FIGS. 1 and 2, the ultraviolet irradiation apparatus according to the present embodiment includes a plurality of light emitting modules 1... 1, a header 2 to which a plurality of light emitting modules 1. 1 and a conductive connection plate 3 for electrically connecting 1.

  This ultraviolet irradiation device is attached adjacent to a print head that ejects ultraviolet curable ink of a printing device, and is supplied with operating power from an external power source such as a commercial power source. Further, the ultraviolet irradiation device is fixed to the printing device, and the printing object such as paper on which ink is jetted can move relative to the front and rear direction of the ultraviolet irradiation device to irradiate the entire printing object with ultraviolet rays. Is set to

  The light emitting module 1 is formed in a rectangular parallelepiped shape by a rectangular plate-like substrate 12 on which an ultraviolet light emitting diode 11 having an emission wavelength in the ultraviolet region is mounted, and a metal material having high thermal conductivity and electrical conductivity such as copper, for example. 12, a base block 13 disposed below the base block 13, an insulating layer 15 provided so as to cover one side of the base block 13 and the substrate 12, and thermal conductivity and electrical conductivity of, for example, copper. A shape viewed from the side is made of a high metal material in an L shape, and includes a cover block 14 disposed so as to cover the upper side of the substrate 12 and the outer side of the insulating layer 15. The cover block 14 is provided with a hole 14a that exposes the light emitting surface of the ultraviolet light emitting diode 11, and a lens 16 is formed by filling the hole 14a with a translucent resin.

  The base block 13 is provided with two ports 13a and 13a in the lower part of the base block 13 as a cooling flow path through which a fluid for cooling the light emitting module flows, and passes through the vicinity of the lower side of the ultraviolet light emitting diode 11. Thus, a cylindrical flow path 13b is formed. In addition, screw holes 13c and 14b are provided in the side surfaces of the base block 13 and the cover block 14 that face each other in the front-rear direction of the light emitting module 1.

  The ultraviolet light-emitting diode 11 is a surface-mounting light-emitting diode, and is disposed at the center position in the front-rear and left-right directions of the light-emitting module 1 such that the light-emitting surface is on the upper side of the light-emitting module 1. The ultraviolet light emitting diode 11 has electrodes (not shown) on both upper and lower surfaces, the anode electrode on the lower surface is directly connected to the substrate 12 by die bonding, and the cathode electrode on the upper surface is electrically connected to the cover block 14 by wire bonding. The The base block 13 is electrically connected to the anode electrode of the ultraviolet light emitting diode through the substrate 12, and the ultraviolet light emitting diode 11 emits light by passing a current between the base block 13 and the cover block 14. Ultraviolet rays are radiated upward of the light emitting module 1 through the lens 16. The light distribution of ultraviolet rays can be adjusted by adjusting the inclination angle and reflectance of the inner wall surface of the hole 14a.

  The header 2 is made of an insulating material having rubber elasticity on the upper surface side of a support base 2a made of a metal material having high thermal conductivity, and a gasket 2b interposed between the support base 2a and the light emitting module 1 is screwed, for example. It is formed by adhering.

  A supply path 21 and a discharge path 22 for passing a cooling fluid are formed in the support base 2a along the longitudinal direction of the header 2 (left and right direction in the ultraviolet irradiation device). Circular supply ports 21 a and discharge ports 22 a communicating with the supply passage 21 and the discharge passage 22 are opened at appropriate positions above the supply passage 21 and the discharge passage 22. The gasket 2b has a supply hole 23 and a discharge hole 24 having the same diameter as the supply port 21a and the discharge port 22a, respectively, at positions corresponding to the supply port 21a and the discharge port 22a of the support base 2a.

  In order to attach the light emitting module 1 to the header 2, the light emitting module 1 is disposed so that the ports 13 a and 13 a face the supply hole 23 and the discharge hole 24 of the header 2, and are coupled by, for example, screws (not shown). At this time, the mounting directions of the plurality of light emitting modules 1... 1 are alternately arranged with different front and back, and the base block 13 of the adjacent light emitting modules 1 and 1 and the terminal portion of the cover block 14 are connected to the ultraviolet light emitting device 1. Are arranged side by side alternately. In addition, since the gasket 2b has rubber elasticity, the gasket 2b is compressed and coupled between the light emitting module 1 and the support base 2a, and the gap between the ports 13a and 13a and the supply holes 23 and the discharge holes 24 is eliminated. It becomes dense.

  Next, the base block 13 and the cover block 14 of the adjacent light emitting modules 1 and 1 are electrically connected by the conductive connection plate 3. Here, the conductive connection plate 3 is made of a metal material having a high electrical conductivity, and mounting holes 3a and 3b are provided at positions facing the screw holes 13c and 14b provided in the base block 13 and the cover block 14, respectively. ing. The screw 31 is inserted into the mounting holes 3a and 3b and screwed into the screw holes 13c and 14b, whereby the base block 13 and the cover block 14 of the adjacent light emitting modules 1 and 1 are electrically connected by the conductive connection plate 3. . Thereby, the several light emitting modules 1 ... 1 are connected in series.

  Further, the plurality of light emitting modules 1... 1 are arranged side by side on the upper surface side of the base 2, so that the supply path 21, the supply hole 23, the discharge path 22 and the discharge hole 24 of the base 2, and the flow path of each light emitting module 1. 13b forms a cooling water channel, and for example, a cooling liquid such as water that is liquid at room temperature and has a specific heat close to 1 flows. This cooling liquid is set so as to be constantly flown by the cooling device connected to the outside of the ultraviolet irradiation device so as to circulate in the flow path and to keep a certain temperature or less.

  In this way, the ultraviolet illumination device can irradiate the printing object with ultraviolet rays by receiving power supplied from the commercial power source. At this time, the ultraviolet light-emitting diode 11 generates heat, but the heat generated by the ultraviolet light-emitting diode 11 flows from the base block 13 and the cover block 14 made of metal having high thermal conductivity and the cooling liquid flowing through the above-described flow path. Heat is radiated to the outside. Here, the base block 13 and the cover block 14 connected to the electrodes on both sides of the ultraviolet light-emitting diode 11 are electrically connected via the conductive connection plate 3 on the two side surfaces opposed in the moving direction. By reducing the length of the light emitting module 1 in the moving direction, a small ultraviolet irradiation device can be provided.

  In addition, this Embodiment does not limit the arrangement | sequence method to the header 2 of the light emitting module 1, You may arrange | position the several adjacent light emitting module 1 in the same direction before and behind, and may connect electrically in parallel.

  A plurality of light emitting modules 1 may be arranged in a plurality of rows along the front-rear direction of the header 2. If it does in this way, it is also possible to arrange | position the ultraviolet light emitting diode 11 by changing the light emission wavelength, for example.

DESCRIPTION OF SYMBOLS 1 Light emitting module 2 Header 2a Support stand 2b Gasket 3 Conductive connection board 11 Ultraviolet light emitting diode (light emitting element)
12 Substrate 13 Base block 14 Cover block 15 Insulating layer 16 Projection lens

Claims (1)

An ultraviolet irradiation device that cures an ultraviolet curable ink by irradiating ultraviolet rays onto an ultraviolet curable ink placed on a printing object,
A plurality of light emitting modules arranged in a direction orthogonal to the moving direction of the print object;
Each light emitting module has a light emitting element whose emission wavelength is in the ultraviolet region on the front surface, and has terminal portions electrically connected to both side electrodes of the light emitting element on two side surfaces facing each other in the moving direction. ,
An ultraviolet irradiation device comprising a conductive connection portion for electrically connecting terminal portions of a plurality of light emitting modules on the side surface side.

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