JP2020131672A - Ultraviolet curing device and ultraviolet curing system - Google Patents

Abstract

To provide an ultraviolet curing device which can cure an object to be cured with good efficiency by a simple configuration.SOLUTION: An ultraviolet curing device 10 comprises: an LED module 22 which outputs light with a wavelength in an ultraviolet range; and a reflector 26 which reflects light outputted from the LED module 22, radiates the same onto an upper surface Wa of a work-piece W transported in one direction. The LED module 22 irradiates a first irradiation region A1 of the upper surface Wa and a reflection region Ar (reflection surface 26a) of the reflector 26 with light. The reflector 26 focuses light in the reflection region Ar to a second irradiation region A2 which is narrow than the reflection region Ar on the upper surface Wa. In a transportation direction of the work-piece W, the first irradiation region A1 is formed on a downstream side of the second irradiation region A2.SELECTED DRAWING: Figure 1

Description

The present invention relates to an ultraviolet curing device and an ultraviolet curing system.

Conventionally, there is an ultraviolet curing device that irradiates an object to be cured such as an ultraviolet curable ink or an adhesive with light having a wavelength in the ultraviolet region to cure it (see, for example, Patent Document 1).
In the ultraviolet curing device of Patent Document 1, an LED is used as a light source, and the arrangement density of the LED per unit area is higher on the upstream side than on the downstream side in the transport direction of the object to be cured. As a result, a peak of ultraviolet intensity is formed on the upstream side in the transport direction, and the object to be cured such as ink and adhesive is efficiently cured.

Japanese Unexamined Patent Publication No. 2012-256754

By the way, in the above-mentioned ultraviolet curing device, LEDs having different numbers of LED chips (number of elements) are used in order to change the arrangement density of LEDs per unit area. That is, a plurality of types of LEDs are used. However, it is desired to develop an ultraviolet curing apparatus capable of efficiently curing the object to be cured with a simpler configuration.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an ultraviolet curing device and an ultraviolet curing system capable of efficiently curing an object to be cured by a simple configuration.

An ultraviolet curing device that solves the above problems includes a light source that outputs light having a wavelength in the ultraviolet region, and an object to be irradiated that reflects the light output by the light source and is transported in one direction from upstream to downstream. The light source comprises a reflecting mirror that irradiates the irradiated surface, the light source irradiates the first irradiation region on the irradiated surface and the reflecting region on the reflecting mirror, and the reflecting mirror is a reflection region of the reflecting region. Light is focused on a second irradiation region narrower than the reflection region on the irradiated surface, and the first irradiation region is on the downstream side of the second irradiation region in the transport direction of the irradiation target. Is formed in.

According to the above aspect, the inside of the object to be cured such as ink is cured by the light having high ultraviolet intensity focused by the reflector in the second irradiation region on the upstream side in the transport direction, and the first irradiation on the downstream side in the transport direction. The surface of the object to be cured, such as ink, can be cured by the light having a low ultraviolet intensity emitted from the light source in the region. As a result, even if a single type of light source is used, the curing shortage can be reduced and the curing time can be shortened by a simple configuration using a reflecting mirror.

In the ultraviolet curing device, it is preferable that the first irradiation region and the second irradiation region are continuous or partially overlap on the irradiated surface.
According to the above aspect, by connecting or partially overlapping the first irradiation region and the second irradiation region, curing by light having high ultraviolet intensity and curing by light having low ultraviolet intensity can be continuously performed. it can.

In the ultraviolet curing device, the light source preferably outputs band-shaped light extending in the width direction orthogonal to the transport direction with respect to the irradiated surface.
According to the above aspect, since the light is a band-shaped light extending in the width direction, the light can be more reliably irradiated to the irradiated surface.

In the ultraviolet curing device, the light source preferably includes a plurality of LED chips provided side by side in the width direction.
According to the above aspect, it is possible to irradiate a wide range of light with a plurality of LED chips provided side by side in the width direction.

In the ultraviolet curing device, the light source preferably includes a plurality of LED chips provided side by side in a direction orthogonal to the width direction and orthogonal to the transport direction.
According to the above aspect, it is possible to irradiate a wide range of light by a plurality of LED chips provided side by side in a direction orthogonal to the width direction and orthogonal to the transport direction.

In the ultraviolet curing device, the angle at which the first straight line connecting the light source and the center of the first irradiation region and the irradiated surface intersect in the first direction from the downstream to the upstream is the first. In the direction, it is preferably smaller than the angle at which the second straight line connecting the center of the reflection region and the center of the second irradiation region intersects the irradiated surface.

According to the above aspect, the first irradiation region A1 can be made wider than the second irradiation region A2, and the ultraviolet illuminance can be made relatively small.
The ultraviolet curing system that solves the above problems includes the ultraviolet curing device according to any one of the above, and a conveying unit that conveys the object to be irradiated in the conveying direction.

According to the above aspect, it is possible to provide an ultraviolet curing system having the same effect as the curing of the ultraviolet curing device according to any one of the above.

According to one aspect of the present disclosure, it is possible to provide an ultraviolet curing device and an ultraviolet curing system capable of efficiently curing an object to be cured by a simple configuration.

The schematic block diagram of the ultraviolet curing system in one Embodiment. The perspective view of the ultraviolet curing apparatus in the same embodiment. Explanatory drawing for demonstrating arrangement mode of the light source of the ultraviolet curing apparatus in the same embodiment. The graph which shows the change of the ultraviolet illuminance by the light of the 1st irradiation area and the 2nd irradiation area of the ultraviolet curing apparatus in the same embodiment. The graph which shows the change of the ultraviolet illuminance by the light of the 1st irradiation area and the 2nd irradiation area of the ultraviolet curing apparatus in the same embodiment. The graph which shows the change of the ultraviolet illuminance by the light of the 2nd irradiation region of the ultraviolet curing apparatus in the same embodiment. The graph which shows the change of the ultraviolet illuminance by the light of the 1st irradiation region of the ultraviolet curing apparatus in the same embodiment. Explanatory drawing for demonstrating arrangement mode of the light source of the ultraviolet curing apparatus in the modified example. The graph which shows the change of the ultraviolet illuminance by the light of the 1st irradiation area and the 2nd irradiation area of the ultraviolet curing apparatus in the modified example. The schematic block diagram of the ultraviolet curing system in the modified example.

Hereinafter, an embodiment of the ultraviolet curing apparatus will be described with reference to the drawings.
As shown in FIG. 1, the ultraviolet curing system 1 of the present embodiment has an ultraviolet curing device 10 and a conveying unit 100 for conveying the work W.

As shown in FIGS. 1 and 2, the ultraviolet curing device 10 of the present embodiment has an ultraviolet irradiation head 11 and a controller 12.
As shown in FIG. 1, the ultraviolet curing device 10 is a device that irradiates, for example, an ultraviolet curing material with ultraviolet rays from a light source of an irradiation head 11 in order to cure the material. The position of the ultraviolet curing device 10 with respect to the transport unit 100 is fixed, and the work W transported by the transport unit 100 is irradiated with ultraviolet light.

As shown in FIG. 2, the ultraviolet irradiation head 11 is provided with a plurality of LED modules 22 as light sources arranged side by side in a housing 21.
As shown in FIGS. 1 and 2, the housing 21 is formed in a rectangular box shape that is long in the parallel direction of the LED modules 22. The housing 21 has an opening 21a on one side in a state where the ultraviolet curing device 10 is fixed in position with respect to the conveying portion 100. Then, in the ultraviolet irradiation head 11, the opening 21a is arranged so as to face the work W (the surface to be cured). For example, when the ultraviolet curable material of the work W is cured from above the work W, the housing 21 is arranged so that the opening 21a faces downward (downward in the vertical direction). In the following description, the vertical direction is the vertical direction X, the parallel direction of the LED modules 22 and the longitudinal direction of the housing 21 are the parallel direction Y, and the transport direction of the work W by the transport unit 100 is the transport direction Z. .. Further, in each figure, the respective directions are appropriately illustrated as "X", "Y", and "Z". It should be noted that the vertical direction here merely indicates the vertical direction in the drawing, and does not indicate the vertical direction in the actual ultraviolet irradiation head 11.

As shown in FIG. 2, the opening 21a of the housing 21 is a rectangular through hole long in the parallel direction Y. The opening 21a is provided with a light-transmitting cover 23 so as to close the opening 21a. The translucent cover 23 has a flat plate shape and is made of a material that transmits at least the wavelength of ultraviolet rays. The translucent cover 23 may be made of a member that is transparent to visible light.

As shown in FIG. 3, each LED module 22 has a plate-shaped base member 24 and a plurality of COB (Chip On Board) type LEDs (Light Emitting Diodes) 25 attached to the base member 24. Each LED module 22 of the present embodiment has six LEDs 25, and the LEDs 25 are provided so as to be arranged in the parallel direction Y.

The COB type LED 25 has a substrate 25a and a plurality of LED chips 25b provided on the substrate 25a.
On the substrate 25a, the mounting surface on which the LED chip 25b is mounted is arranged orthogonal to the transport direction Z in a state where the position of the ultraviolet curing device 10 is fixed with respect to the transport unit 100. In other words, the mounting surface on which the LED chip 25b is mounted faces a direction parallel to the transport direction Z (downstream side in the Z direction in FIG. 1). A plurality of LED chips 25b are provided on the mounting surface of the substrate 25a.

A plurality of (4 in this example) LED chips 25b are provided side by side in the parallel direction Y (width direction) orthogonal to the transport direction Z. Further, a plurality of LED chips 25b (five in this example) are provided side by side in the vertical direction X orthogonal to the transport direction Z and orthogonal to the parallel direction Y. That is, a total of 20 LED chips 25b are provided for one substrate 25a.

Each LED chip 25b outputs light having a wavelength in the ultraviolet region. The LED chip 25b may include light having a wavelength in the ultraviolet region, and may include light having a wavelength in a region other than the ultraviolet region.

As shown in FIG. 1, in the LED module 22, the light emitted from each LED chip 25b is partially emitted to the outside through the translucent cover 23 provided in the opening 21a of the housing 21. .. Here, among the light emitted from the LED module 22, the region where the light is directly irradiated to the upper surface Wa as the irradiated surface of the transported work W is referred to as the first irradiation region A1.

A reflector 26 is provided on the exit surface side of the LED module 22 and on the downstream side in the transport direction Z. The reflector 26 is fixed to the housing 21.
The reflector 26 has a concave reflecting surface 26a having a substantially U-shaped cross section cut in the vertical direction X, and is formed so as to extend in the parallel direction Y so as to correspond to each LED module 22. .. Here, the reflecting mirror 26 is arranged so that the reflecting surface 26a faces the LED module 22. Then, among the light emitted from the LED module 22, the light that reaches the first irradiation region A1 passes through the reflecting surface 26a side of the reflecting mirror 26.

The reflecting mirror 26 is adapted so that a part of the light emitted from the LED module 22 is incident on the reflecting surface 26a and is reflected by the reflecting mirror 26. The light reflected by the reflector 26 is emitted to the outside through the translucent cover 23 provided in the opening 21a of the housing 21. Here, among the light emitted from the LED module 22, the region where the light reflected by the reflector 26 is irradiated to the upper surface Wa of the conveyed work W is referred to as the second irradiation region A2. Further, among the light emitted from the LED module 22 and incident on the reflecting mirror 26, the light incident on the reflecting surface 26a when reflected on the second irradiation region A2 is defined as the reflection region Ar.

Most of the first irradiation region A1 is located downstream of the second irradiation region A2 in the transport direction Z. A part of the first irradiation region A1 overlaps with a part of the second irradiation region A2. Further, the first irradiation region A1 is wider than the second irradiation region A2. Further, the second irradiation region A2 is narrower than the reflection region Ar.

Further, in the direction from the downstream to the upstream, the first straight line L1 connecting the LED module 22 and the center of the first irradiation region A1 and the upper surface Wa as the irradiated surface intersect at an angle D1. On the other hand, in the first direction, the second straight line L2 connecting the center of the reflection region Ar and the center of the second irradiation region A2 and the upper surface Wa intersect at an angle D2. The angle D1 is smaller than the angle D2. That is, the light in the first irradiation region A1 is inclined with respect to the vertical direction. Therefore, the first irradiation region A1 can be widened, and the ultraviolet illuminance in the first irradiation region A1 can be reduced.

Further, the range of the first irradiation region A1 and the second irradiation region A2 changes depending on the work distance WD, which is the distance from the translucent cover 23 to the upper surface Wa of the work W. That is, the first irradiation region A1 is configured so that the light spreads radially in the emission direction, but the second irradiation region A2 is defined as a predetermined work distance WD (here, WD0). In (WD0 = 50 mm), the width (length) of the second irradiation region A2 in the transport direction is the shortest. Even when it is the shortest, it is configured to be a strip-shaped region having a predetermined width (predetermined length) in the transport direction.

Then, on the side shorter than the predetermined work distance WD0, the shorter the work distance WD, the narrower the first irradiation area A1 and the wider the second irradiation area A2, and on the side longer than the predetermined work distance WD0, the work distance. The longer the WD, the wider the first irradiation region and the second irradiation region A2. The first irradiation region A1 can also be adjusted by the opening 21a. On the other hand, the second irradiation region A2 can also be adjusted by the radius of curvature of the reflecting mirror 26 and the length of the reflecting region Ar.

In the ultraviolet curing device 10 configured as described above, the LED module 22 as a light source is located on the upstream side of the transport unit 100 in the transport direction Z, and the reflector 26 is located on the downstream side of the transport unit 100 in the transport direction Z. It is fixed to do.

The operation of this embodiment will be described.
The ultraviolet curing device 10 of the present embodiment irradiates the work W conveyed by the conveying unit 100 with light having a wavelength in the ultraviolet region. The light emitted from the LED module 22 as the light source of the ultraviolet curing device 10 irradiates the first irradiation region A1 that is directly irradiated to the outside and the second irradiation region A2 that is irradiated to the outside through the reflector 26. Will be done.

Here, the ultraviolet illuminance in the first irradiation region A1 and the second irradiation region A2 will be described with reference to FIGS. 4 to 7. These figures are graphs showing the relationship between the measurement position and the ultraviolet intensity. In these graphs, the vertical axis shows the ultraviolet intensity and the horizontal axis shows the measurement position. FIG. 4 is a graph showing changes in ultraviolet illuminance in the first irradiation region A1 and the second irradiation region A2. In FIG. 4, the graph when the work distance WD is 30 mm is shown by a chain line, and the graph when the work distance WD is 50 mm is shown by a solid line. FIG. 5 is a graph showing changes in ultraviolet illuminance in the first irradiation region A1 and the second irradiation region A2 when the work distance WD is 50 mm. The graph of the change in the ultraviolet illuminance shown in FIG. 5 has a different measurement position range and a different measurement timing as compared with the graph when the work distance WD shown in FIG. 4 is 50 mm. FIG. 6 is a graph showing a change in ultraviolet intensity due to light in the second irradiation region A2 when the work distance WD is 50 mm. FIG. 7 is a graph showing a change in ultraviolet intensity due to light in the first irradiation region A1 when the work distance WD is 50 mm. Here, a composite of the graphs shown in FIGS. 6 and 7 is the graph shown by the solid line in FIG. As for the measurement positions in FIGS. 4 to 7, the specified position directly under the ultraviolet curing device 10 is set to 0 (zero), the larger the positive value, the upstream side in the transport direction, and the larger the negative value, the downstream side in the transport direction. Shown.

As can be seen from FIG. 5, when the work distance WD is 50 mm, the ultraviolet illuminance sharply increases when the measurement position is around 10 mm and the ultraviolet illuminance peaks when the measurement position is around 0 mm in the light from the second irradiation region A2. Therefore, the ultraviolet illuminance sharply decreases when the measurement position is around -10 mm to -20 mm. Then, when the measurement position is in the range of about 50 mm to 10 mm and about -20 mm to -50 mm, it becomes approximately 0 (zero).

As can be seen from FIG. 6, when the work distance WD is 50 mm, in the light from the first irradiation region A1, the ultraviolet rays gradually increase from the measurement position of about 0 mm, and the measurement position is about -40 mm to -50 mm. Ultraviolet illuminance peaks. Further, as can be seen from FIG. 4, the ultraviolet illuminance gradually decreases in the range of −50 mm to −120 mm. Further, when the measurement position is in the range of about 50 mm to 0 mm, it is approximately 0 (zero).

As can be seen from FIG. 4, when the work distance WD is 50 mm, the ultraviolet illuminance becomes 0 in the range of about 10 mm to −120 mm due to the light of the first irradiation region A1 and the light of the second irradiation region A2. It never becomes. That is, it can be seen that the first irradiation region A1 and the second irradiation region A2 are continuous or partially overlapped. This is the same even when the work distance WD is 30 mm as shown by the alternate long and short dash line in FIG. 4, although the range is different.

As can be seen from FIGS. 4 to 6, the peak of the ultraviolet illuminance due to the light in the first irradiation region A1 is lower than the peak of the ultraviolet illuminance due to the light in the second irradiation region A2. In other words, the ultraviolet illuminance due to the light in the second irradiation region A2 is higher than the peak of the ultraviolet illuminance due to the light in the first irradiation region A1. This is because the light emitted from the LED module 22 is focused on the second region A2, which is narrower than the reflection region Ar of the reflection surface 26a, by the reflection surface 26a recessed in the U shape of the reflector 26. .. That is, the light reflected by the reflecting surface 26a of the reflecting mirror 26 is irradiated as light having a high ultraviolet illuminance in the second irradiation region A2 on the upstream side of the transport direction Z relative to the first irradiation region A1. Thereby, for example, the inside of the ink (target to be cured) printed on the upper surface Wa of the work W can be cured. Then, the light directly emitted from the LED module 22 is irradiated as light having a low ultraviolet illuminance in the first irradiation region A1 on the downstream side of the transport direction Z. As a result, the surface of the ink can be cured.

According to the present embodiment described above, the following effects are obtained.
(1) In the second irradiation region A2 on the upstream side of the transport direction Z, the inside of the object to be cured such as ink is cured by the light having high ultraviolet intensity condensed by the reflecting mirror 26, and the first on the downstream side of the transport direction Z. The surface of the object to be cured, such as ink, can be cured by the light having a low ultraviolet intensity emitted from the LED module 22 as a light source in the irradiation region A1. As a result, even if a single type of light source is used, the curing shortage can be reduced and the curing time can be shortened by a simple configuration using the reflecting mirror 26.

As described in FIG. 4, the intensity distributions of the ultraviolet intensities of WD30 and WD50 are similar, and the regions where the ultraviolet intensities are high are configured to form similar regions. That is, in the present embodiment, in the WD30 and WD50 (more specifically, WD30 to WD90), the high intensity region (width (length / area) in the transport direction) of the second irradiation region A2 is within that range. It is designed so that there is little fluctuation in the change of WD. In other words, the work distance WD range in which the width of the second irradiation region A2 is narrowest in the transport direction can be regarded as a predetermined range (WD30 to WD90).

(2) By connecting or partially overlapping the first irradiation region A1 and the second irradiation region A2, curing by light having high ultraviolet intensity and curing by light having low ultraviolet intensity can be continuously carried out. ..

(3) Since the light emitted from the LED module 22 is a band-shaped light extending in the width direction, the light can be more reliably irradiated to the upper surface Wa which is the irradiated surface.
(4) It is possible to irradiate a wide range with light by a plurality of LED chips 25b provided side by side in the parallel direction Y, which is the width direction.

(5) Light can be irradiated over a wide range by a plurality of LED chips 25b provided side by side in the vertical direction X, which is orthogonal to the parallel direction Y and orthogonal to the transport direction Z.
(6) The angle D1 at which the first straight line L1 connecting the LED module 22 and the center of the first irradiation region A1 intersects the upper surface Wa is the second angle D1 connecting the center of the reflection region Ar and the center of the second irradiation region A2. Since it is smaller than the angle D2 at which the straight line L2 and the upper surface Wa intersect, the first irradiation region A1 can be made wider than the second irradiation region A2, and the ultraviolet illuminance can be made relatively smaller.

The above embodiment can be modified and implemented as follows. The above-described embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

-In the above embodiment, the LED 25 is a COB type, but the LED 25 is not limited to this, and for example, a bullet type or an SMD (Surface Mount Device) type LED can be adopted.
-In the above embodiment, one LED module 22 is provided with six LEDs 25, but the present invention is not limited to this. The number of LEDs 25 may be arbitrarily changed.

As shown in FIG. 8, one LED module 30 may be configured to provide four LEDs 25. FIG. 9 shows a graph showing changes in ultraviolet illuminance in the first irradiation region A1 and the second irradiation region A2 when the number of LEDs 25 is thinned out.

In FIG. 9, the vertical axis represents the ultraviolet intensity, and the horizontal axis represents the measurement position. In FIG. 9, the graph when the work distance WD is 30 mm is shown by a dash-dotted line, and the graph when the work distance WD is 50 mm is shown by a solid line. As for the measurement position in FIG. 9, the specified position directly under the ultraviolet curing device 10 is set to 0 (zero), and the larger the positive value, the upstream side in the transport direction, and the larger the negative value, the downstream side in the transport direction. ..

As can be seen from FIG. 9, when the work distance WD is 50 mm, the ultraviolet illuminance sharply increases when the measurement position is around 10 mm, and the ultraviolet illuminance peaks when the measurement position is around -10 mm, and the measurement position becomes The ultraviolet illuminance drops sharply around -20 mm. Then, the ultraviolet intensity gradually decreases in the range of the measurement position of about −30 mm to −150 mm. This is the same even when the work distance WD is 30 mm as shown by the alternate long and short dash line in FIG. 9, although the range is different. That is, even in the configuration in which the LEDs 25 are thinned out, the ink or the like is cured by the light having high ultraviolet intensity focused by the reflecting mirror 26 in the second irradiation region A2 on the upstream side in the transport direction Z as in the above embodiment. The inside of the object is cured, and the surface of the object to be cured such as ink can be cured by the light having a low ultraviolet intensity emitted from the LED module 22 as a light source in the first irradiation region A1 on the downstream side of the transport direction Z. ..

-In the above embodiment, the LED chips 25b are arranged in an array in one LED 25, but the arrangement mode may be changed as appropriate. Further, the number of LED chips 25b in the parallel direction Y, which is the width direction, and the number in the vertical direction X may be appropriately changed.

-In the above embodiment, the first irradiation region A1 and the second irradiation region A2 are partially overlapped, but the present invention is not limited to this. For example, the first irradiation region A1 and the second irradiation region A2 may be connected (adjacent) to each other. Further, the first irradiation region A1 and the second irradiation region A2 may be separated from each other. The arrangement relationship between the first irradiation region A1 and the second irradiation region A2 can be adjusted by adjusting the relative angle of the reflector 26 with respect to the LED module 22.

-In the above embodiment, the light reaching the first irradiation region A1 from the LED module 22 passes through the reflection surface 26a side (front side) of the reflector 26, but the present invention is not limited to this, and the reflection of the reflector 26 is not limited to this. It may be configured to pass through the opposite side (back side) of the surface 26a. As an example thereof, FIG. 10 will be described.

As shown in FIG. 10, the reflecting mirror 26 reflects the light emitted from the lower portion of the LED 25 of the LED module 22 by the reflecting mirror 26 to form the second irradiation region A2, and reflects the light emitted from the LED 25. The first irradiation region A1 is formed by directly irradiating the work W through the opposite side of the reflection surface 26a of the mirror 26. In the example shown in FIG. 10, the first irradiation region A1 and the second irradiation region A2 are separated from each other. Further, in the example shown in FIG. 10, it is restricted that the light of the LED 25 is directly irradiated onto the work W from below the reflector 26 by a part of the housing 21.

-In the above embodiment, the light emitted by the LED module 22 irradiates the first irradiation region A1 and the second irradiation region A2, but the present invention is not limited to this configuration. For example, most of the light emitted from the LED module 22 may be applied exclusively to the reflecting surface 26a. That is, most of the light emitted from the LED module 22 irradiates the second irradiation region A2. In this case, a direct LED module that irradiates the first irradiation region A1 is provided separately from the LED module 22. The direct LED module is arranged so as to face downward with respect to the housing 21.

-In the above embodiment, it is preferable that the relative angle between the LED module 22 and the reflector 26 and the relative angle between the ultraviolet irradiation head 11 and the work W can be adjusted. Thereby, the width of the first irradiation region A1 and the second irradiation region A2 can be adjusted.

-In the above embodiment, the ultraviolet irradiation head 11 is arranged with the opening 21a facing downward in the vertical direction, but is not limited to this configuration. For example, when it is desired to cure from below the work W, the opening 21a is arranged so as to face upward in the vertical direction. That is, the ultraviolet irradiation head 11 may be arranged so that the ultraviolet curing material of the work W faces the cured direction.

-In the above embodiment, the ultraviolet irradiation head 11 is arranged so that the opening 21a is substantially parallel to the work W, but the present invention is not limited to this configuration, and the opening 21a is arranged at an angle with respect to the work W. You may. By arranging the ultraviolet irradiation head 11 at an angle in this way, the first irradiation region A1 and the second irradiation region A2 can be adjusted. For this reason, it is preferable that the ultraviolet irradiation head 11 can adjust the inclination with respect to the work W.

-In the above embodiment, the LED module is used as the light source, but another light source such as an ultraviolet lamp may be used.

1 ... UV curing system, 10 ... UV curing device, 22 ... LED module (light source), 25 ... LED, 25b ... LED chip, 26 ... reflector, 100 ... transport unit, A1 ... first irradiation area, A2 ... second Irradiation area, Ar ... Reflection area, D1, D2 ... Angle, L1 ... First straight line, L2 ... Second straight line, W ... Work (irradiated object), Wa ... Upper surface (irradiated surface), X ... Vertical direction , Y ... Parallel arrangement direction (width direction), Z ... Transport direction.

Claims (7)

A light source that outputs light with wavelengths in the ultraviolet region,
A reflector that reflects the light output by the light source and irradiates the irradiated surface of the object to be irradiated, which is transported in one direction from upstream to downstream.
With
The light source irradiates the first irradiation region on the irradiated surface and the reflection region on the reflector with light.
The reflecting mirror collects the light in the reflecting region on the irradiated surface with respect to the second irradiation region narrower than the reflecting region.
An ultraviolet curing device in which the first irradiation region is formed on the downstream side of the second irradiation region in the transport direction of the irradiation target. The ultraviolet curing apparatus according to claim 1, wherein the first irradiation region and the second irradiation region are continuous or partially overlapped on the irradiated surface. The ultraviolet curing device according to claim 1 or 2, wherein the light source outputs band-shaped light extending in a width direction orthogonal to the transport direction with respect to the irradiated surface. The ultraviolet curing device according to claim 3, wherein the light source includes a plurality of LED chips provided side by side in the width direction. The ultraviolet curing device according to claim 3 or 4, wherein the light source includes a plurality of LED chips provided side by side in a direction orthogonal to the width direction and orthogonal to the transport direction. The angle at which the first straight line connecting the light source and the center of the first irradiation region and the irradiated surface in the first direction from the downstream to the upstream is the angle of the reflection region in the first direction. The ultraviolet curing apparatus according to claim 1, wherein the angle is smaller than the angle at which the second straight line connecting the center and the center of the second irradiation region intersects the irradiated surface. An ultraviolet curing system comprising the ultraviolet curing apparatus according to any one of claims 1 to 6 and a transporting unit that transports the irradiated object in a transporting direction.