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Light irradiation device

A technology of light irradiation device and point light source, applied in printing device, printing, printing machine, etc., can solve the problem of insufficient curing, and achieve the effect of reducing attenuation and improving peak illuminance

Inactive Publication Date: 2010-12-29
USHIO DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The present invention was made to solve the above problems, and an object of the present invention is to realize a light irradiation device capable of curing various ultraviolet curable inks reliably without causing insufficient curing of the inks. , In addition, it is possible to effectively combine point light sources and linear light sources with different emission wavelength peaks to form a miniaturized

Method used

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Experimental program
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no. 1 approach

[0058] figure 1 It is a perspective view showing a schematic structure of the head of the inkjet printer of the present invention. In this figure, for ease of understanding, the inside of the light irradiation device can be seen in the figure, and some optical components are omitted.

[0059] The inkjet printer 1 has a bar-shaped guide rail 2 on which a carriage 3 is supported. The carriage 3 reciprocates on the substrate 5 along the guide rail 2 (X direction) by the carriage driving mechanism.

[0060] On the carriage 3 is mounted a recording head 4 provided with nozzles for ejecting ink. Light irradiation devices 6 are provided on both sides of the recording head 4 along the moving direction of the carriage 3 . On the light irradiation device 6, a point light source and a linear light source having different emission wavelength peaks as described later are provided, and the ink, which is the liquid material ejected from the nozzle of the recording head 4 to the base materi...

no. 2 approach

[0091] In the first embodiment, the cylindrical lens 30 is used as the condensing means, but in the second embodiment, a plurality of rod lenses 31 are used. image 3 A cross-sectional view showing a light irradiation device according to a second embodiment. (a) of the figure is a cross-sectional view in the X direction (direction along the moving direction of the head), and (b) is a cross-sectional view in the Y direction (direction perpendicular to the moving direction of the head).

[0092] In this embodiment, on the light exit side of the reflector 22 , a plurality of rod lenses 31 are arranged in parallel contact on a plane perpendicular to the optical axis of the light reflected by the reflector 22 .

[0093]The light emitted from the discharge lamp 10 is reflected by the spheroidal reflective surface of the reflector 22 , becomes light condensed on the second focal point of the reflector 22 , and enters the plurality of rod lenses 31 . Among the lights emitted from the...

no. 3 approach

[0100] In the first and second embodiments, discharge lamps are used as point light sources, but in the third embodiment, light-emitting elements (hereinafter referred to as LEDs) are used as point light sources, but unnecessary visible light and infrared radiation are very few, which is the same in the three embodiments.

[0101] Figure 4 (a) shows a configuration example of a light source portion when an LED is used as a point light source. As shown in the figure, on the metal substrate 16, for example, nine LED packages 13 are arranged linearly. A heat sink is mounted on the surface of the metal substrate 16 opposite to the surface on which the LED package 13 is mounted.

[0102] As for the LED, for example, a current of 1.5 A, a voltage of 35 V, a power of 52 W, and an output of 5 W of ultraviolet light having a wavelength of 365 nm are used.

[0103] A cylindrical lens 15 is mounted on the emission side of the LED package 13 .

[0104] Figure 4 (b) is to use Figu...

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Abstract

A compact light irradiation device which is able to cure a broad variety of UV curable inks reliably is provided with a head part having a recording head 4 ejecting a photocurable liquid material to a substrate 5 and a light irradiation device 6 emitting light to cure the liquid material having been ejected to and having impinged on the substrate 5. The light irradiation device 6 has a point light source 10 and linear light sources 11 having different emission wavelength peaks. The point light source 10 is provided with an optical element 30 focusing the emission light linearly. The linear light sources 11 are arranged such that their longitudinal direction is arranged along the longitudinal direction of the linearly focused light of said point light source 10 and such that the spacing from the substrate 5 is closer than that of said point light 10.

Description

technical field [0001] The present invention relates to a light irradiation device for a printer that ejects a photocurable liquid material onto a substrate to form a pattern. Background technique [0002] In recent years, the inkjet recording method has been used in various printing fields such as photographs, various types of printing, marks, and special printing such as color screening, because gravure printing can easily and inexpensively produce images. [0003] Inkjet printers can be classified according to the type of ink, and there is a photocurable inkjet method using photocurable ink cured by irradiation with light such as ultraviolet rays. The photocurable inkjet method has attracted attention because it has relatively low odor and can record on recording media that do not have quick-drying and ink-absorbing properties in addition to special paper. [0004] In such a photocurable inkjet inkjet printer, in addition to a recording head that ejects ink as fine dropl...

Claims

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Application Information

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IPC IPC(8): B41J11/00
CPCB41J11/002B41J11/0021B41J11/00214B41F23/0406B41M7/0072B41J11/00218
Inventor 仲田重范铃木一好
Owner USHIO DENKI KK
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