JP2007335561A - Led ultraviolet-ray irradiating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED ultraviolet-ray irradiating apparatus which can efficiently and uniformly carry out ultraviolet curing in a desired location, and can easily be cooled. <P>SOLUTION: A plurality of ultraviolet-ray LEDs 2 arranged in a matrix form, a power supply 3 for carrying out the lighting control of the ultraviolet-ray LEDs, and a means for cooling a wiring board 1 are provided on the wiring board 1. Further, a cooling member 5 having a vent 7 and having a cooling plate member on the bottom thereof is arranged on the entire back of the plurality of ultraviolet-ray LEDs, and a blower 8 is arranged on the back of the cooling member 5. The blower is formed in the size of the cooling member except a part of the periphery thereof, and a cooling effect is increased from the end of the wiring board toward the center thereof so that temperature distribution in the wiring board is balanced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an LED ultraviolet irradiation device used for an ultraviolet curing process in bonding substrate members of various display panels with an ultraviolet curable adhesive, and an ultraviolet curing ink or coating material curing process in various printing and coating.

In bonding the display panel substrate members with an ultraviolet curable adhesive, an ultraviolet lamp such as a metal halide lamp is usually used as an ultraviolet irradiation source.
(See Patent Document 1)
Further, for example, in an apparatus for processing a semiconductor wafer, an LED ultraviolet irradiation device using an LED is implemented. (See Patent Document 2)
Further, for example, as a substrate surface seal of a liquid crystal display cell substrate, an LED is used. (See Patent Document 3)

JP 2003-295109 A JP 2006-40944 A JP 2006-30933 A

However, since short-wavelength ultraviolet rays and visible infrared rays that are unnecessary for curing (which adversely affects the display substrate) are also emitted, a mask is provided between the substrate and the ultraviolet lamp, and the temperature rise of the substrate is suppressed. Therefore, it is necessary to provide a cooling mechanism.
Furthermore, since the entire display panel is irradiated with ultraviolet rays, the position where the sealant is applied is very small, and wasteful energy that is not used for curing is wasted.

On the other hand, the luminous efficiency of the ultraviolet LED deteriorates as the temperature of the LED element increases, so that cooling of the element is important. However, when a plurality of LEDs are arranged, even if forced cooling is performed, if the substrate temperature and the LED element temperature are not uniform, there will be variations in light emission for each LED. In particular, when a large number of ultraviolet LEDs are arranged, the temperature near the center becomes higher than the surroundings. As a result, there is a drawback that uneven curing occurs.
Moreover, since the light emitting part of the ultraviolet LED itself is a very small region, there is a drawback that uneven illumination occurs even if a plurality of light emitting parts are simply arranged side by side. Further, there is a drawback that the ultraviolet illuminance obtained when the irradiation distance is increased in order to suppress the illuminance unevenness is lowered.

Therefore, an object of the present invention is to provide an LED ultraviolet irradiation device that can efficiently and uniformly UV cure a desired portion and that can easily cool the device.

In order to solve the above problems, the present invention provides a wiring board having a plurality of UV LEDs arranged in a matrix, a power supply device for controlling lighting of the UV LEDs, and a means for cooling the wiring board. It is related with LED ultraviolet irradiation device.
Moreover, the cooling body which has a ventilation hole in the whole back part of several ultraviolet LED, and provides the cooling plate body in the bottom part is arrange | positioned, and the air blower is arrange | positioned in the back part of the cooling body, and the air blower is a cooling body. It is comprised by the magnitude | size which excluded some outer periphery.
Then, the cooling effect is increased from the end of the cooling plate toward the center of the cooling plate, and the temperature distribution of the wiring board disposed corresponding to the cooling plate is balanced.

Claim 2 is the LED ultraviolet irradiation device according to claim 1, wherein a plurality of ultraviolet LEDs arranged in a matrix are selectively lit corresponding to the ultraviolet curing location of the irradiated object, and from a desired direction of the ultraviolet cured product. It is configured to irradiate.

  According to the LED ultraviolet irradiation device of claim 1, the entire wiring board can be averaged and cooled via the cooling plate body by a simple device, and the ultraviolet LED of the wiring board is averaged overall, The light output can be balanced, and the irradiated object can be uniformly cured.

  According to the LED ultraviolet irradiation device of claim 2, since it is configured to selectively illuminate corresponding to the ultraviolet curing location of the irradiated object and to irradiate from the desired direction of the ultraviolet cured product, ultraviolet rays are applied to the necessary location. Irradiation and UV curing can be ensured.

The best mode of the LED ultraviolet irradiation device of the present invention will be described below with reference to FIGS.

  A first embodiment according to the present invention will be described below with reference to FIGS. FIG. 1 is a schematic plan view of an LED ultraviolet irradiation device according to the present invention, FIG. 2 is a side view of the LED ultraviolet irradiation device according to the present invention, and FIG. 3 is a layout view of LEDs in the LED ultraviolet irradiation device according to the present invention. In FIG. 1 to FIG. 3, reference numeral 1 denotes a wiring board on which an LED is mounted, which has a length of 18.5 cm, a width of 1.0 cm, and a thickness of 2 mm. Reference numeral 2 denotes a plurality of ultraviolet LEDs arranged in a matrix on the wiring board 1, and for example, 14 LEDs are arranged at regular intervals in a row, for example, 14 rows are arranged. The ultraviolet LED 2 is composed of 196 1 to 5 W 365 nm ones.

  Reference numeral 3 denotes a connector, which is connected to a power supply device for controlling lighting of the ultraviolet LED. For example, the ultraviolet LEDs arranged in each row are controlled to be lit for each row. Reference numeral 4 denotes wiring for controlling the lighting of the ultraviolet LEDs independently in each column.

Reference numeral 5 denotes a cooling plate disposed on a surface corresponding to the ultraviolet LED disposed on the wiring board 1, and is made of, for example, an aluminum material having high thermal conductivity. A cooling body 6 is disposed on the entire back surface of the cooling plate 5 opposite to the ultraviolet LED, and is made of an aluminum material having high thermal conductivity. Reference numeral 7 denotes a large number of plates constituting the cooling body 6, which are arranged, for example, at equal intervals. Reference numeral 8 denotes a ventilation hole constituted by the plate body 7, and the interval between the ventilation holes 8 is, for example, about 4 mm. The height of the cooling body 6 is 50 mm. With this configuration, the cooling air passes through the ventilation holes 8 and strikes the cooling plate 5 to cool the ultraviolet LED together with the wiring board 1. Further, when grease is applied between the cooling plate body 5 and the wiring board 1, the adhesion between them is improved.

Reference numeral 10 denotes a blower arranged on the back surface of the cooling body 6, as shown in FIG. 6, excluding a part of the outer periphery of the cooling body 6 and having a size corresponding to the central portion and the vicinity of the central portion. It is. As the blower, a propeller fan of 5 to 20 W is used, and the blower is configured to blow 1.0 to 2.0 m ³ / min. In FIG. 1 and FIG. 2, the wiring board 1 on which the ultraviolet LED is arranged is configured in a square shape, and a cooling plate body 5 configured in a square shape is arranged on the entire bottom corresponding to the wiring board 1. Further, a blower 10 having a round outlet is arranged on the back surface of the cooling body 6. The round jet nozzle of the blower 10 is configured to have a size that overlaps with the area of about 55% to 70% of the cooling body 6, for example. In the LED ultraviolet irradiation device having the same structure, as shown in FIG. 6, the blower is configured to have a size excluding a part of the outer periphery of the cooling body 6, so the cooling plate body 5 is averaged and cooled as a whole. Is done. Further, since the cooling plate 5 is arranged corresponding to the wiring board 1 having ultraviolet LEDs, the ultraviolet LEDs are cooled together with the wiring board as a whole. The proportion of the blower 10 occupying the nozzle varies depending on the use conditions of the ultraviolet LED.

For example, when the cooling body 5 is configured to have a length of 150 mm and a width of 216 mm, the size of the circularly configured blower is configured to have a diameter of Φ150 mm, for example.

  Reference numeral 11 denotes a spacer formed at a plurality of locations near the outer periphery of the lower surface of the cooling plate body 6, and is configured so that the ultraviolet LED does not directly contact the surface to be irradiated.

Further, the ultraviolet LED 2 is selectively lit corresponding to the ultraviolet curing portion of the irradiated object, and is irradiated from a desired direction of the ultraviolet cured product.
For selective lighting of the ultraviolet LEDs 2, for example, 14 ultraviolet LEDs 2 arranged are controlled to be lit independently for each column. If comprised in this way, a required location can be hardened | cured efficiently with an ultraviolet-ray. Moreover, since it comprised so that it might irradiate from the diagonal direction of an ultraviolet-ray hardened | cured material by ultraviolet LED2, it can irradiate a ultraviolet-ray efficiently to a required location and can be reliably ultraviolet-cured.

In addition, since it is configured to select the distance between the plurality of ultraviolet LEDs and the surface to be irradiated according to the size and shape of the object to be irradiated, it is possible to efficiently irradiate the necessary places with ultraviolet rays and ensure Can be UV-cured. For example, in the case of liquid crystal glass, the distance from the ultraviolet LED to the cured resin is about 10 mm. If the distance from the ultraviolet LED to the cured resin is short, the illuminance distribution is non-uniform, and if it is long, the ultraviolet intensity is insufficient.
By adjusting the distance between the ultraviolet LED 2 and the object to be irradiated by the object to be cured in this way, it is possible to efficiently irradiate the necessary part of the object to be irradiated with the ultraviolet ray and reliably cure the ultraviolet ray.

  Next, the temperature distribution of the LED ultraviolet irradiation device described above will be described with reference to FIGS. According to the structure using the cooling fan, the temperature distribution shown in Table 1 is obtained. On the other hand, according to the structure not using the blower, the temperature distribution shown in Table 2 is obtained.

〔単位：℃〕 [Table 1] Temperature distribution at a specific position when using a blower

[Unit: ° C]

〔単位：℃〕 [Table 2] Temperature distribution at a specific position when no blower is used

[Unit: ° C]

When the temperature distribution of Table 1 and Table 2 described above is shown in the figure, when the cooling air is blown, it becomes as shown in FIG. Moreover, according to the structure which does not blow cooling air, it will become as shown in FIG.
As apparent from FIGS. 4 and 5, according to the LED ultraviolet irradiation device of the present invention, the temperature on the substrate surface is within 4.9 degrees. According to the structure of the present invention in which a blower is not used for the LED ultraviolet irradiation device, the temperature on the substrate surface has a large difference of 10.2 degrees. Further, according to the structure shown in the present invention, the temperature on the substrate surface is reduced by about 19 degrees at a high place.
As described above, according to the present invention, the temperature generally decreases, and further, the temperature difference on the substrate surface is small, so there is almost no difference in the luminous efficiency of the ultraviolet LED, the luminous efficiency is constant, and the sealing material is uniform. Can be cured.
Further, since the temperature difference on the substrate surface is small, the ultraviolet LED can maintain the initial life as a whole.

The schematic plan view of the LED ultraviolet irradiation device which concerns on this invention. The side view of the LED ultraviolet irradiation device shown in FIG. The arrangement | positioning drawing of LED of the LED ultraviolet irradiation device shown in FIG. The temperature distribution map of the LED ultraviolet irradiation device shown in FIG. The temperature distribution figure when not providing a cooling mechanism. The top view which shows the relationship between the size of the cooling body of FIG. 1, and an air blower.

Explanation of symbols

1 Wiring board 2 UV LED
3 Connector 5 Cooling plate body 6 Cooling body 7 Plate body 8 Ventilation hole 10 Blower 11 Spacer

Claims (2)

In the LED ultraviolet irradiation device having a plurality of ultraviolet LEDs arranged in a matrix on the wiring board, a power supply device for controlling the lighting of the ultraviolet LEDs, and means for cooling the wiring board,
A cooling body having ventilation holes and a cooling plate body provided at the bottom is disposed on the entire back surface of the plurality of ultraviolet LEDs, and a blower is disposed on the back surface of the cooling body. Consists of a size excluding a part of the outer periphery, increasing the cooling effect from the end of the cooling plate toward the center of the cooling plate, and balancing the temperature distribution of the wiring board arranged corresponding to the cooling plate An LED ultraviolet irradiation device characterized by being configured to take. The plurality of ultraviolet LEDs arranged in a matrix form are selectively lit corresponding to the ultraviolet curing locations of the irradiated object, and are configured to irradiate from a desired direction of the ultraviolet cured product. LED ultraviolet irradiation device.

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