JPH10300897A - Ultraviolet ray irradiation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To vertically emit a maximum ultraviolet ray to a matter to be irradiated by providing an optical lens under the convergence point of a reflector between an ultraviolet ray emitter and a slit device, and changing the direction of the reflected light vertically so as to be guided to the slit of the slit device. SOLUTION: A horizontally long box-shaped ultraviolet ray irradiation device 2 has an exhaust cylinder 6 in the upper part, and a horizontally long reflector 7 and a straight ultraviolet ray lamp 8 in the inner part. The reflector 7 has a heat exhausting clearance 11 in the longitudinal direction just above the ultraviolet ray lamp 8. A longitudinal slit member 3 regulates the irradiation of ultraviolet ray vertically to the carrying direction of a matter to be irradiated 9, and an orthogonal slit member 4 regulates the irradiation of ultraviolet ray vertically to the matter to be irradiated 9 in the longitudinal direction of the ultraviolet ray lamp 8. An optical lens is arranged under the convergence point of the reflected light of the reflector 7 to change the advancing direction of the converged reflected light to the direction vertical to the matter to be irradiated 9, and the reflected light is introduced into the slit 13a of a longitudinal upper slit member 3a. Thus, the ultraviolet ray dose to the matter to be irradiated can be remarkably increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet curing device for curing an ultraviolet curable resin.

[0002]

2. Description of the Related Art For example, when it is desired to form a fine vertical stripe-shaped UV-curable resin cured pattern on a surface of an object to be irradiated, an ultraviolet-curable resin is applied on the surface of the object to be irradiated in the form of vertical stripes, and the cured resin film having the vertical stripes is formed. It is required to irradiate the surface of the irradiation object with ultraviolet rays in a direction perpendicular to and parallel to the vertical stripes so that the cross section of the edge becomes vertical.

For this reason, for example, as shown in FIG.
There is a device for projecting light from a light source 42 disposed inside a reflector 44 to a reflecting mirror 44 via a facing lens group 43, and irradiating a parallel light from the reflecting mirror 44 to a work 45.

[0004]

However, such a conventional apparatus has a drawback that the overall height of the apparatus is 1 m to 2 m, and the apparatus is large and the cost is high.

An object of the present invention is to provide a small-sized ultraviolet irradiation apparatus capable of irradiating an object to be irradiated with as much ultraviolet rays as possible from a vertical direction.

[0006]

According to the present invention, there is provided an ultraviolet irradiator having a straight tube-type ultraviolet lamp, an ultraviolet irradiator having a reflector having a lower opening and disposed to cover the ultraviolet lamp, and an ultraviolet irradiator. A slit device including a longitudinal slit member having a slit extending in a longitudinal direction of the ultraviolet lamp and a perpendicular slit member having a slit in a direction perpendicular to the longitudinal slit member, and an ultraviolet irradiator. An optical lens which is disposed below the condensing point of the reflector between the slit devices and which vertically changes the direction of light reflected from the reflector and guides the reflected light to the slit of the slit device.

[0007] The reflector is characterized in that the reflecting surface is formed of a seamless integrated reflector.

Further, the reflecting surface of the reflector is composed of a plurality of reflecting surface constituting pieces, and the joint of the reflecting surface constituting pieces is inclined with respect to the longitudinal direction of the ultraviolet lamp.

[0009] Further, the present invention is characterized in that the inclined seam of the reflection surface constituting piece is arranged so as not to overlap in the direction orthogonal to the longitudinal direction of the ultraviolet lamp.

[0010]

1 and 2, an ultraviolet irradiator 1 includes an ultraviolet irradiator 2, a slit device including a longitudinal slit member 3 (3a, 3b) and an orthogonal slit member 4, and an optical lens. 5, which are arranged in the main body 1a of the ultraviolet irradiation device 1. The ultraviolet irradiator 2 has a horizontally long box shape, and has an exhaust pipe 6 for exhausting hot air at an upper portion, and has a horizontally long reflector 7 and a straight tube type ultraviolet lamp 8 therein. A transport device 10 for transporting the irradiation object 9 is disposed below the ultraviolet irradiation device 1. As the ultraviolet lamp 8, for example, a straight tube type high pressure discharge lamp is used.

The reflector 7 is provided with a gap 11 for exhausting hot air from the ultraviolet lamp 8 in the longitudinal direction of the upper portion corresponding to directly above the ultraviolet lamp 8. A reflective surface is disposed on the inner surface of the reflector 7, and the reflective surface is an integral type made of a single aluminum plate, or a cold mirror which transmits infrared rays and reflects ultraviolet rays as shown in FIG. Made of a plurality of parallelogram-shaped reflecting surface constituting pieces 7a. If the emission length of the ultraviolet lamp is short, an integral aluminum plate may be used.However, if a long emission lamp is used, a plurality of Are more preferable.

It is preferable that the joints 7b and 7c of the reflection surface constituting piece 7a arranged with the gap 11 therebetween are arranged so as not to overlap in the direction orthogonal to the longitudinal direction of the ultraviolet lamp 8. That is, in the entire length of the ultraviolet lamp 8 in the longitudinal direction, the line intersects the line 12 orthogonal to the ultraviolet lamp 8 at only one position (for example, 7d). The reason for this is to reduce the drop in illuminance at that point due to the joint of the reflector. If the parallelogram has a small inclination angle, the seams 7b and 7c are shown in FIG.
It is not preferable that the light beam overlaps in the direction perpendicular to the longitudinal direction of the ultraviolet lamp 8 and intersects the line 12 perpendicular to the ultraviolet lamp 8 at two places as described above.

The length of the base 7e of the triangle having the joints 7b and 7c as hypotenuses is set to be larger than the swing width of the orthogonal slit member 4 described later. When the swing width is smaller than the swing width, a decrease in the amount of ultraviolet irradiation due to the seam tends to occur. The shape of the reflection surface constituting piece 7a is not limited to a parallelogram, and may be a trapezoid or other shapes. Further, the shape of the reflection surface constituting piece 7a may be different on both sides in the longitudinal direction of the gap 11.

The longitudinal slit member 3 regulates the direction of the ultraviolet light so as to irradiate the ultraviolet light perpendicularly to the conveying direction of the irradiation object 9. The longitudinal slit member 3 a
And a lower slit member 3b in the longitudinal direction. The longitudinal upper slit member 3a comprises an upper partition 13 and a slit 13a provided therein, and the longitudinal lower slit member 3b comprises a lower partition 14 and a slit 14a provided therein. Upper partition 13
The lower partition 14 is horizontally disposed so as to partition the inside of the main body 1a, and the orthogonal slit member 4 is disposed between the two partitions.

The slits 13a and 14a are provided directly below the ultraviolet lamp 8 and along the longitudinal direction of the ultraviolet lamp 8, respectively. The width of the slits 13a and 14a is determined according to the incident angle of light required for the object 9 to be irradiated. Both longitudinal sides of the slits 13a and 14a of the upper and lower partitions 13 and 14 are bent upward and downward, respectively, so as to guide light vertically downward.

The orthogonal slit member 4 regulates the direction of the ultraviolet light so that the object 9 can be irradiated with the ultraviolet light in the longitudinal direction of the ultraviolet lamp 8. It is composed of a number of plate members 4b which are arranged and fixed on both sides at intervals, and the gap between each plate member 4b forms a slit. The size of the gap (slit width) between the plate members 4b is determined by the incident angle of light required for the object 9 to be irradiated. Each plate 4b is arranged in a direction orthogonal to the ultraviolet lamp 8 and the slits 13a and 14a of the longitudinal slit member 3.

The orthogonal slit member 4 is swung in order to prevent the shadow of the plate 4b of the orthogonal slit member 4 from being generated on the object 9 to be irradiated. That is, a roller-4c is provided on the outer side of the box 4a, and the roller-4c is attached to the main body 1a.
It is movable on a rail 15 installed in the inside. The swing of the box 4a is performed by the swing device 16.

Above the longitudinal upper slit member 3a,
The long optical lens 5 is arranged along the longitudinal direction of the slit 13a. The optical lens 5 is arranged so as to be located below (diffusion area) the focal point 17 of the reflected light.
The optical lens 5 has a characteristic of converting the traveling direction of the reflected light condensed via the reflector 7 of the ultraviolet irradiator 2 in a direction perpendicular to the irradiation object 9, and converts the reflected light in the longitudinal direction. It is guided into the slit 13a of the slit member 3a.

The direct light radiated directly below the lamp 8 passes through the optical lens 5, passes through the slit 13 a, the slit of the orthogonal slit member 4, and the slit 14 a, and irradiates the illuminated object 9 passing therebelow. . Light emitted from the ultraviolet lamp 8 in the direction of the reflector is reflected by the reflector 7 and then condensed at a condensing point 17 where the light is redirected by the optical lens 5 into the slit 13a of the upper slit member 3a in the longitudinal direction. ,
The light passes through the slit 14a of the orthogonal direction slit member 4 and the slit 14a, and is irradiated on the irradiation target 9 that passes immediately below the slit 14a.

As described above, the longitudinal slit member 3 allows only light perpendicular to the longitudinal direction of the ultraviolet lamp 8 to pass through the object. At this time, since both edges of the upper and lower slits 13a and 14a of the longitudinal slit member 3 are bent, only vertical light is selectively passed. The orthogonal slit member 4 allows only light perpendicular to the longitudinal direction of the ultraviolet lamp 8 to pass. Therefore, the object to be irradiated is irradiated with ultraviolet rays that are perpendicular in both the traveling direction and the direction perpendicular thereto. Further, since the optical lens 5 guides the reflected light, which has not been conventionally used, to the slit 13a from the vertical direction, the amount of ultraviolet light applied to the object to be irradiated increases dramatically.

As described above, since the orthogonal slit member 4 is swung by the swing device 16, the shadow of the plate 4b of the orthogonal slit member 4 is prevented from being generated on the irradiation object 9. In addition, the inside of the main body 1a, the inside of the ultraviolet irradiator 2, the longitudinal direction slit member 3 and the orthogonal direction slit member 4 are painted black to prevent light reflection.

[0022]

Example 1 The efficiency of use of ultraviolet light, the illuminance of ultraviolet light applied to an object to be irradiated, and the amount of ultraviolet light were measured in the ultraviolet irradiation apparatus of the present invention. The test was performed under the following conditions. UV lamp: Metal halide lamp for UV curing, 4
kw, emission length 250 mm Reflector: diagonal seam aluminum mirror (seam inclination angle 50 °) Longitudinal slit: width 15 mm, interval between upper and lower slits 250 mm Orthogonal slit: width 4 mm, plate height 120 mm,
Oscillating width 8 mm Irradiation distance (distance from lamp to irradiated object): 300 m
m UV illuminometer used: Iwasaki Electric UV illuminometer UVP
Z-2

[0023]

[Table 1]

[0024]

COMPARATIVE EXAMPLE The ultraviolet light utilization efficiency, ultraviolet illuminance, and ultraviolet light amount applied to an object were measured under the same conditions except that the optical lens was not used. Table 2 shows the results.

[0025]

[Table 2]

From Example 1 and Comparative Example, the apparatus of the present invention which makes effective use of the reflected light has remarkably superior ultraviolet light use efficiency, ultraviolet illuminance and amount of ultraviolet light applied to an object to be irradiated, as compared with Comparative Example. You can see that.

[0027]

Example 2 The illuminance distribution of the ultraviolet irradiation apparatus of Example 1 having the reflector shown in FIG. 3 was measured. The result is as shown in FIG. On the other hand, the illuminance distribution of an ultraviolet irradiation device having a reflector in which the seam 7f of the reflection surface constituting piece was perpendicular to the ultraviolet lamp as shown in FIG. 6 was measured. The result is as shown in FIG. From now on, in the case of FIG. 7, while the illuminance at the joint 7f falls as shown by the arrow,
In the case of FIG. 5, the effect of the seam was not seen at all.

[0028]

According to the ultraviolet irradiation apparatus of the present invention, the reflected light can be effectively used even if it is small, so that the amount of ultraviolet light irradiated to the irradiation object can be increased.

Even when a plurality of constituent pieces are used for the reflecting surface, the seam of the reflecting surface is inclined and the seams are arranged so as not to overlap in the direction orthogonal to the longitudinal direction of the ultraviolet lamp. The decrease in illuminance can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an ultraviolet irradiation device of the present invention.

FIG. 2 is a diagram showing a cross section in the longitudinal direction of the ultraviolet irradiation device of the present invention, partially cut away.

FIG. 3 is a diagram showing an inner surface of a reflector of the ultraviolet irradiation device of the present invention.

FIG. 4 is a view showing an unfavorable example of the inner surface of the reflector.

FIG. 5 is a diagram showing an illuminance distribution of the ultraviolet irradiation device of the present invention.

FIG. 6 is a view showing a reflector in which seams are arranged in a direction perpendicular to the longitudinal direction of the ultraviolet lamp.

FIG. 7 is a view showing the illuminance distribution of the ultraviolet irradiation device having the reflector shown in FIG. 6;

FIG. 8 is a diagram illustrating a conventional ultraviolet irradiation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ultraviolet irradiation device 1a Main body 2 Ultraviolet irradiation device 3 Longitudinal slit member 3a Longitudinal upper slit member 3b Longitudinal lower slit member 4 Orthogonal slit member 4a Box 4b Plate 4c Roller 5 Optical lens 6 Exhaust cylinder 7 Reflector 7a Reflecting surface constituting piece 7b Seam 7c Seam 7d Intersection 7e Bottom 7f Seam 8 Ultraviolet lamp 9 Irradiated object 10 Transport device 11 Gap 12 Line 13 Upper partition 13a Slit 14 Lower partition 14a Slit 15 Rail 16 Swing device 17 Focus point

Claims (4)

[Claims] 1. An ultraviolet irradiator having a straight tube type ultraviolet lamp and a reflector having an open lower portion disposed so as to cover the ultraviolet lamp, and disposed below the ultraviolet irradiator in a longitudinal direction of the ultraviolet lamp. A slit device having a longitudinal slit member having an extending slit and an orthogonal slit member having a slit in a direction perpendicular to the longitudinal slit member, and a light-collecting point of a reflector between the ultraviolet irradiator and the slit device. An ultraviolet irradiation device, comprising: an optical lens disposed below and vertically changing the direction of light reflected from the reflector to guide the light to the slit of the slit device. 2. The ultraviolet irradiation apparatus according to claim 1, wherein the reflecting surface of the reflector is formed of a seamless integrated reflector. 3. The reflector according to claim 1, wherein the reflecting surface of the reflector comprises a plurality of reflecting surface constituting pieces, and a joint of the reflecting surface constituting pieces is inclined with respect to the longitudinal direction of the ultraviolet lamp. UV irradiation device. 4. The ultraviolet irradiating apparatus according to claim 3, wherein the inclined seams of the reflection surface constituting piece are arranged so as not to overlap in a direction orthogonal to the longitudinal direction of the ultraviolet lamp.