JP2018199096A - Ultraviolet irradiator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reduce the width of a reflector and suppress a temperature rise at the same time. An ultraviolet irradiator 1 surrounds a linear light source 10 that radiates ultraviolet rays, and includes a reflecting mirror 11 that irradiates a predetermined portion F with ultraviolet rays. The reflecting mirror 11 collects the ultraviolet rays of the linear light source 10 at the arrangement position of the first reflecting surface 12A that reflects the ultraviolet rays of the linear light source 10 toward the predetermined portion F and the ultraviolet rays of the linear light source 10 at the arrangement position of the linear light source 10, and the first reflecting surface. A second reflecting surface 12B that is incident on the 12A and condenses light on a predetermined portion F is provided, and the second reflecting surface 12B is arranged farther from the linear light source 10 than the first reflecting surface 12A. [Selection diagram] Fig. 1

Description

  The present invention relates to an ultraviolet irradiator.

Conventionally, a UV paint is applied to a three-dimensional object such as a vehicle body or a bathtub, and the UV paint is dried and cured by irradiating ultraviolet rays using an ultraviolet irradiator.
Since this type of ultraviolet irradiator requires illuminance to cure the UV paint, it is desired to reduce the size of the reflecting mirror so that it can approach a three-dimensional object and to improve the maximum illuminance.
As a means for reducing the size of the light irradiator, a method of combining a plurality of reflecting mirrors having different three-dimensional structures is known (see, for example, Patent Documents 1 and 2).

JP 2010-212114 A JP 2004-119364 A

However, in the configurations of Patent Documents 1 and 2, as the size of the reflecting mirror is reduced, the light source and the reflecting mirror approach each other, and the temperature rises easily.
Therefore, an object of the present invention is to make it possible to achieve both a reduction in size of a reflecting mirror and suppression of a temperature rise.

  To achieve the above object, the present invention provides an ultraviolet irradiator comprising: a linear light source that emits ultraviolet light; and a reflecting mirror that surrounds the linear light source and irradiates the ultraviolet light at a predetermined location. The reflecting mirror is configured to condense the ultraviolet light of the linear light source at the position where the linear light source is arranged and to enter the main reflective surface, and to reflect the ultraviolet light of the linear light source toward the predetermined location. And a circular reflection surface for condensing the light at the predetermined location, wherein the circular reflection surface is arranged farther from the linear light source than the main reflection surface.

  In the ultraviolet irradiator according to the present invention, the main reflection surface and the circular reflection surface are connected in this order from the linear light source side to the predetermined portion side, and the circular reflection surface Is arranged closer to the predetermined location than the position of the linear light source.

  According to the present invention, in the ultraviolet irradiator, the reflecting mirror includes another reflecting surface that is connected to the predetermined location side of the circular reflecting surface and reflects the ultraviolet rays of the linear light source toward the predetermined location. It is characterized by that.

  According to the present invention, in the ultraviolet irradiator, the main reflection surface is an elliptical reflection surface that collects ultraviolet rays of the linear light source at the predetermined location, and the other reflection surface has the same focal point as the elliptical reflection surface. And an elliptical reflecting surface having a minor axis shorter than the minor axis of the elliptical reflecting surface.

  The present invention is characterized in that, in the ultraviolet irradiator, the main reflection surface and the circular reflection surface are arranged to face each other with the linear light source interposed therebetween.

  According to the present invention, in the ultraviolet irradiator, an end portion of the circular reflecting surface is separated from an end portion of the main reflecting surface, and the ultraviolet ray reflected by the circular reflecting surface is incident on the main reflecting surface. It is provided in.

  According to the present invention, in the ultraviolet irradiator, the main reflection surface is an elliptical reflection surface that condenses the ultraviolet rays of the linear light source at the predetermined location.

  According to the present invention, in the ultraviolet irradiator, the main reflection surface is a parabolic reflection surface in which the linear light source is disposed at a focal point.

  ADVANTAGE OF THE INVENTION According to this invention, size reduction of a reflecting mirror and suppression of a temperature rise can be made compatible.

It is a figure which shows the structure of the ultraviolet irradiator which concerns on 1st Embodiment of this invention. It is a figure which shows a reflecting mirror with a one part light beam. It is a figure which shows the structure of the ultraviolet irradiation device which concerns on 2nd Embodiment. It is a figure which shows a reflecting mirror with a one part light beam. It is a figure which shows the structure of the ultraviolet irradiation device which concerns on a 1st comparative example with a one part light beam. It is the figure which accumulated the reflective mirror of 1st and 2nd embodiment, and the reflective mirror of the 1st and 2nd comparative example. (A) is a figure which shows an example of the use condition at the time of using the ultraviolet irradiation device of 1st Embodiment and a 1st comparative example single, (B) shows an example of the use condition at the time of using with multiple units | sets. FIG. It is a figure which shows each maximum illumination intensity E and ratio R of the reflective mirror of 1st and 2nd embodiment, and the reflective mirror of a 1st and 2nd comparative example. It is a figure which shows the illumination intensity distribution according to irradiation distance of each reflecting mirror. (A) is a figure which shows the wind speed distribution of the cooling wind of 1st Embodiment, (B) is a figure which shows the wind speed distribution of the cooling wind of 2nd Embodiment, (C) is the wind speed distribution of the cooling wind of a 1st comparative example. (D) is a figure which shows the wind speed distribution of the cooling wind of a 3rd comparative example. It is a figure which shows the average temperature T1, the minimum temperature T2, and the maximum temperature T3 of each mirror. (A) is a figure which shows a modification, (B) is a figure which shows a 4th comparative example. It is a figure which shows the illumination intensity distribution according to irradiation distance of the reflective mirror of a modification and a 4th comparative example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a diagram showing a configuration of an ultraviolet irradiator 1 according to the first embodiment of the present invention.
The ultraviolet irradiator 1 is a device that cures and dries the UV paint applied to the workpiece W by irradiating the three-dimensional workpiece W such as a vehicle body or a bathtub with ultraviolet rays, and is also referred to as an ultraviolet curing device.
The ultraviolet irradiator 1 includes a first housing 2 having an opening 2 </ b> A on the workpiece W side, and a light source unit 3 provided in the first housing 2. In the following description, the workpiece W side is referred to as the front side, and the side opposite to the workpiece W is referred to as the back side. Further, the directions such as up, down, left and right in the following description follow the directions shown in FIG. Further, the horizontal direction shown in FIG. 1 coincides with the width direction N of the ultraviolet irradiator 1.
The first housing 2 is formed in a substantially rectangular parallelepiped shape extending in the depth direction of the paper surface of FIG. 1, and the opening 2 </ b> A of the first housing 2 is covered with a cover glass 4. The cover glass 4 is formed of a light transmissive member that transmits ultraviolet light, transmits the ultraviolet light irradiated from the light source unit 3, and closes the opening 2 </ b> A of the first housing 2. The cover glass 4 is formed of, for example, a filter that transmits ultraviolet rays or quartz glass.

The light source unit 3 includes a second housing 5 disposed in the first housing 2, a linear light source 10, and a reflecting mirror 11 constituting a concave reflecting mirror that covers the linear light source 10 from the back side. Yes.
The 2nd housing | casing 5 is formed in the substantially rectangular parallelepiped shape extended in the paper surface depth direction of FIG. 1, and surrounds the linear light source 10 and the reflective mirror 11 from the back side. The second housing 5 has an opening 5A on the front side which is the workpiece W side, and the irradiation light from the linear light source 10 passes through the opening 5A.
Cooling air blown from a blower (not shown) is supplied into the first housing 2 of the ultraviolet irradiator 1, and this cooling air enters the second housing 5 from the opening 5 </ b> A of the second housing 5. By doing so, the linear light source 10 and the reflecting mirrors 11L and 11R are cooled.

The linear light source 10 is composed of a straight tube type ultraviolet lamp, and extends in the depth direction of the paper surface of FIG. For this linear light source 10, for example, a long arc lamp is used. In addition, the linear light source 10 can also be configured by arranging a plurality of lamp light sources coaxially in a line. In this case, a short arc light source can be used.
In each drawing including FIG. 1, reference numeral 10 </ b> A indicates the central axis of the linear light source 10. The central axis 10A extends in the longitudinal direction of the linear light source 10 (the depth direction in FIG. 1). Further, in FIG. 1, reference numeral M <b> 1 is a surface extending in a straight line that connects the central axis 10 </ b> A of the linear light source 10 and the center of the irradiation area of the workpiece W (corresponding to the center in the width direction N). Is written.
The direction perpendicular to the reference plane M1 corresponds to the width direction N of the ultraviolet irradiator 1.

The reflecting mirror 11 includes a pair of reflecting mirrors 11L and 11R that are opposed to each other with the linear light source 10 interposed therebetween. The pair of reflecting mirrors 11L and 11R extends from the back side of the linear light source 10 to the vicinity of the opening 5A of the second housing 5, and is formed in a bilaterally symmetric shape with reference to the reference plane M1.
Since the reflecting mirrors 11L and 11R have symmetrical shapes, the left reflecting mirror 11L will be described in detail, and a duplicate description of the right reflecting mirror 11R will be omitted.

FIG. 2 is a view showing the reflecting mirrors 11L and 11R together with some light beams.
The reflecting mirror 11L includes a first reflecting surface 12A, a second reflecting surface 12B, and a third reflecting surface 12C in this order from the linear light source 10 side toward the workpiece W side (front side).
The first reflective surface 12A is an elliptical reflective surface that collects light incident on the first reflective surface 12A from the linear light source 10 at a predetermined position F set in advance. The first reflecting surface 12A is an elliptical arc having the central axis 10A of the linear light source 10 as one focal point (hereinafter referred to as a first focal point) and the predetermined portion F as the other focal point (hereinafter referred to as a second focal point). Or a surface approximating this surface. The predetermined location F is a location that is set in the vicinity of the irradiation position of the workpiece W or in the vicinity of the irradiation position of the workpiece W, and is appropriately set according to the specifications of the ultraviolet irradiator 1. The case of an axis extending along the central axis 10A of the light source 10 is shown.

The second reflecting surface 12B collects the light incident on the second reflecting surface 12B from the linear light source 10 on the central axis 10A that is the arrangement position of the linear light source 10, and the first reflecting surface of the opposing reflecting mirror 11L. 12A is a circular reflecting surface incident on 12A. The second reflecting surface 12B is formed on a surface along an arc that is equidistant from the central axis 10A of the linear light source 10, or a surface that approximates this surface.
The second reflecting surface 12B is disposed closer to the workpiece W than the linear light source 10. That is, the second reflecting surface 12B is located on the workpiece W side from a surface M2 (corresponding to a horizontal plane in FIG. 2) extending in the width direction N through the central axis 10A of the linear light source 10. For this reason, the 2nd reflective surface 12B becomes a shape which approaches reference plane M1 as it goes to work W side from connecting part 12D with the 1st reflective surface 12A.
Thereby, while suppressing an increase in the width (length along the width direction N of the ultraviolet irradiator 1) of the first reflecting surface 12A and the second reflecting surface 12B facing each other, more light is transmitted to the first reflecting surface. It can be condensed with 12A.

  The third reflective surface 12C is an elliptical reflective surface that collects light incident on the third reflective surface 12C from the linear light source 10 at a predetermined location F. The third reflecting surface 12C is an elliptical arc having the central axis 10A of the linear light source 10 as one focal point (hereinafter referred to as a first focal point) and the predetermined portion F as the other focal point (hereinafter referred to as a second focal point). Or a surface approximating this surface. By providing the third reflecting surface 12C, more light can be collected at the predetermined location F.

The elliptical reflective surface of the third reflective surface 12C is an elliptical reflective surface having a short axis shorter than the short axis of the elliptical reflective surface of the first reflective surface 12A. The longer the minor axis is, the more the third reflecting surface 12C is shaped away from the reference surface M1, so that the third reflecting surface 12C can be prevented from protruding from the reference surface M1 by shortening the minor axis. Accordingly, it is possible to suppress an increase in the width of the opposing third reflecting surface 12C (the length along the width direction N of the ultraviolet irradiator 1).
In this configuration, as shown in FIG. 1, the maximum width of the third reflecting surface 12C is the opening width LA (see FIG. 1) at the lower ends of the pair of reflecting mirrors 11L and 11R, so that the increase in the opening width LA is suppressed. It is done. In addition, since an increase in the opening width LA or the like is suppressed, an increase in the housing width LB of the first housing 2 is also suppressed. Therefore, the width of the entire ultraviolet irradiator 1 can be suppressed, and the ultraviolet irradiator 1 can be easily brought close to the workpiece W having a concave shape.

Moreover, since it concentrates on the predetermined location F by the 1st-3rd reflective surfaces 12A-12C, it becomes easy to obtain sufficient illumination intensity for drying and hardening of UV coating in the predetermined location F and its vicinity position.
Further, as shown in FIG. 1, the first reflecting surfaces 12A of the reflecting mirrors 11L and 11R are spaced apart from each other, thereby forming a back opening 12F that opens the back side of the linear light source 10. When the cooling air passes through the rear opening 12F, the cooling air enters between the reflecting mirrors 11L and 11R and cools the linear light source 10 and the first to third reflecting surfaces 12A to 12C. Is discharged smoothly.

As shown in FIG. 1, the shortest distance between the first to third reflecting surfaces 12A to 12C and the linear light source 10 is the shortest distance L1 between the first reflecting surface 12A and the linear light source 10, and the second reflection. The shortest distance L2 between the surface 12B and the linear light source 10 and the shortest distance L3 between the third reflecting surface 12C and the linear light source 10 are formed to have the same length.
That is, the reflecting mirrors 11L and 11R are closest to the linear light source 10 on the back surface side of the linear light source 10, and are separated from the linear light source 10 toward the workpiece W side. Thereby, it becomes easy to flow cooling air smoothly in the reflecting mirrors 11 </ b> L and 11 </ b> R and toward the front side of the linear light source 10. The distances L1, L2, and L3 may be set as appropriate in consideration of the cooling viewpoint and the opening widths LA of the reflecting mirrors 11L and 11R.

Second Embodiment
FIG. 3 is a diagram illustrating a configuration of the ultraviolet irradiator 20 according to the second embodiment.
The ultraviolet irradiator 20 is different from the reflecting mirror 11 of the first embodiment in the reflecting mirror 111. Hereinafter, the reflecting mirror 111 will be described, and other portions will be denoted by the same reference numerals, and redundant description will be omitted.
As shown in FIG. 3, the reflecting mirror 111 includes a pair of reflecting mirrors 111 </ b> L and 111 </ b> R that are arranged to face each other with the linear light source 10 interposed therebetween. The left reflecting mirror 111 </ b> L extends from the back side of the linear light source 10 to the vicinity of the opening 5 </ b> A of the second housing 5. On the other hand, the right reflecting mirror 111 </ b> R is disposed only from the back side of the linear light source 10 to the vicinity of the linear light source 10 and does not extend to the vicinity of the opening 5 </ b> A of the second housing 5.

FIG. 4 is a view showing the reflecting mirrors 111L and 111R together with some light beams.
The reflecting mirror 111L has an ellipsoidal reflecting surface 112A that irradiates the predetermined portion F with light incident from the linear light source 10. As with the first reflecting surface 12A of the first embodiment, the elliptical reflecting surface 112A has the central axis 10A of the linear light source 10 as one focal point (hereinafter referred to as the first focal point), and the predetermined portion F as the other focal point. It is formed on a surface along an elliptical arc as a focal point (hereinafter referred to as a second focal point) or a surface approximating this surface. Further, the elliptical reflecting surface 112 </ b> A is closest to the linear light source 10 on the back side of the linear light source 10. As the shortest distance L4 between the elliptical reflecting surface 112A and the linear light source 10, the same value as or the substantially same value as the shortest distance L1 of the first embodiment is applied.

The reflecting mirror 111R condenses the light incident on the reflecting mirror 111R from the linear light source 10 on the central axis 10A that is the position where the linear light source 10 is disposed, and the circular reflecting surface 112B that is incident on the opposing elliptical reflecting surface 112A. Have. Similar to the second reflecting surface 12B of the first embodiment, the circular reflecting surface 112B is formed on a surface along an arc that is equidistant from the central axis 10A of the linear light source 10, or a surface that approximates this surface. Yes.
That is, in the second embodiment, the elliptical reflecting surface 112A constitutes a reflecting surface similar to the first reflecting surface 12A of the first embodiment, and the circular reflecting surface 112B is the same as the second reflecting surface 12B of the first embodiment. A similar reflecting surface is formed.

Furthermore, in this configuration, as shown in FIG. 3, the front side end 112E of the circular reflecting surface 112B is located on the front side of the linear light source 10 and in the vicinity of the reference surface M1. On the other hand, as shown in FIG. 4, the back surface side end portion 112D of the circular reflection surface 112B is separated from the back surface side end portion 112C of the elliptical reflection surface 112A on the back surface side of the linear light source 10, and the circular reflection surface 112B. Is located in a range in which the ultraviolet light incident on the elliptical reflecting surface 112A is incident.
Further, the back side end 112D is provided at a position where the ultraviolet light reflected by the back side end 112D is reflected by the front side end 112G of the elliptical reflecting surface 112A. In this way, the circular reflection surface 112B is formed in a range in which the light from the linear light source 10 can be reflected to the elliptical reflection surface 112A while providing the back opening 112F between the reflection mirror 111L.

  Further, the circular reflection surface 112B extends from the back side of the linear light source 10 to the front side while keeping the separation distance L5 from the linear light source 10 at an equal distance. The length of the reflecting mirror 111R in the width direction N is made by forming the reflecting mirror 111R into a shape that forms the circular reflecting surface 112B, as compared with the case of forming an elliptical reflecting surface having a symmetrical structure with the elliptic reflecting surface 112A. Is suppressed. As a result, more light can be condensed at the predetermined location F while suppressing an increase in the width (length along the width direction N) of the reflecting mirrors 111L and 111R facing each other. Accordingly, it is possible to reduce the size of the ultraviolet irradiator 1 while suppressing an increase in the opening width LC of the reflecting mirror 111, to easily approach the workpiece W having a concave shape such as a bathtub, and sufficient illuminance to dry and cure the UV paint. It will be easier to get.

As shown in FIG. 3, since the ellipsoidal reflecting surface 112A and the linear light source 10 are separated from each other toward the front side of the linear light source 10, the cooling air flows between the front side of the linear light source 10 and the reflecting mirrors 111L and 111R. It becomes easy to introduce.
Further, as shown in FIG. 3, the upper end of the reflecting mirror 111L and the upper end (back side end portion 112D) of the reflecting mirror 111R are spaced apart from each other, so that they enter between the reflecting mirrors 111L and 111R, It becomes easy to smoothly flow the cooling air that has cooled the linear light source 10 and the reflecting mirrors 111L and 111R.

Here, the distance L5 between the circular reflection surface 112B and the linear light source 10 is set to be longer than the shortest distance L4 between the elliptical reflection surface 112A and the linear light source 10. As shown in FIG. 3, the circular reflection surface 112B extends at a certain distance from the linear light source 10, and therefore, cooling between the linear light source 10 and the elliptical reflection surface 112A is performed. There is a risk that the cooling air will hardly flow through the passage. In this configuration, the separation distance L5 between the circular reflection surface 112B and the linear light source 10 is longer than the shortest distance L4 between the elliptical reflection surface 112A and the linear light source 10, so the circular reflection surface 112B and the linear light source It becomes easy to flow cooling air between 10 and 10 and it becomes easy to suppress the deviation of the cooling air volume.
Note that the separation distance L5 may be substantially the same as the shortest distance L4 within a range in which the cooling air can sufficiently flow between the circular reflection surface 112B and the linear light source 10.

Next, the ultraviolet irradiator 30 according to the first comparative example will be described.
FIG. 5 is a diagram showing the configuration of the ultraviolet irradiator 30 together with some light beams.
The reflecting mirror 211 of the ultraviolet irradiator 30 is composed of a pair of reflecting mirrors 211L and 211R that are arranged to face each other with the linear light source 10 therebetween. The left reflecting mirror 211L is the same as the reflecting mirror 111L of the second embodiment. The right reflecting mirror 211R is formed symmetrically with the left reflecting mirror 211L with reference to the reference plane M1.

Since the elliptical reflecting surfaces 212A and 212B of the reflecting mirrors 211L and 211R are arranged apart from each other, a back opening 212F that opens the back side of the linear light source 10 is formed.
Since the reflecting mirrors 211L and 211R increase in width toward the front side of the linear light source 10, the opening width LE of the reflecting mirror 211 is larger than the opening width LC of the reflecting mirror 111 of the second embodiment. For this reason, the housing width LF of the first housing 2 included in the ultraviolet irradiator 30 is also larger than the housing width LD of the second embodiment.
When the housing width LF is increased, it is disadvantageous for space saving, and a situation in which the irradiation object having a concave shape is not sufficiently close is caused. If not sufficiently close, there is a risk that sufficient illuminance cannot be obtained for drying and curing of the UV paint.

Subsequently, a comparison between the first and second embodiments, the first comparative example, and the second comparative example will be described.
FIG. 6 is a diagram in which the reflecting mirrors 11 and 111 of the first and second embodiments are overlapped with the reflecting mirrors 211 and 311 of the first and second comparative examples.
In FIG. 6, the shortest distances L1 and L4 (FIGS. 1, 3, and 5) between the reflecting mirrors 11, 111, 211, and 311 and the linear light source 10 are substantially the same, and the second comparative example is provided. Except for the above, the case where the illuminance obtained at the predetermined location F described above is substantially the same is shown.

As shown in FIG. 6, the reflecting mirror 311 of the second comparative example is a pair of reflecting mirrors 311L and 311R configured by only a region corresponding to the first reflecting surface 12A among the reflecting mirrors 11L and 11R of the first embodiment. It is the structure which has.
As shown in FIG. 6, when the opening widths LA, LC, LE of the reflecting mirrors 11, 111, 211 are compared, the relationship of opening width LC <opening width LA <opening width LE is established. For example, when the opening width LE of the reflecting mirror 211 is 137.94 mm, the opening width LA of the reflecting mirror 11 having the same focal length as that of the reflecting mirror 211 is 101.2 mm. Similarly, the opening width LC of the reflecting mirror 111 having the same focal length as that of the reflecting mirror 211 is 92 mm.
As described above, the ultraviolet irradiators 1 and 20 of the first and second embodiments are made smaller than the ultraviolet irradiator 30 of the first comparative example, and the ultraviolet irradiator 20 of the second embodiment is most miniaturized. I understand that

FIG. 7A is a diagram illustrating an example of a usage state when the ultraviolet irradiators 1 and 30 of the first embodiment and the first comparative example are used singly. FIG. 7B is a diagram illustrating an example of a usage state when a plurality of ultraviolet irradiators 1 and 30 are used.
As shown in FIG. 7A, in the case of a work W having a concave shape such as a bathtub, when irradiating light to the area AR1 corresponding to the inner corner, the miniaturized ultraviolet irradiator 1 is: It is possible to approach the area AR1 more than the ultraviolet irradiator 30. Therefore, it becomes easier for the ultraviolet irradiator 1 to obtain sufficient illuminance for the drying and curing of the UV paint with respect to the area AR1.
As shown in FIG. 7B, when three ultraviolet irradiators 1 and 30 are used at the same time, the distance b2 between the ultraviolet irradiators 1 at both ends is larger than the distance b1 between the ultraviolet irradiators 30 at both ends. Can be set short. Therefore, even in a configuration using a plurality of units, the ultraviolet irradiator 1 can approach the workpiece W having a three-dimensional shape, and it is easy to obtain sufficient illuminance for drying and curing the UV paint.

FIG. 8 is a diagram illustrating the maximum illuminance E and the ratio R of the reflecting mirrors 11 and 111 of the first and second embodiments and the reflecting mirrors 211 and 311 of the first and second comparative examples.
The maximum illuminance E indicates the maximum illuminance at a position where the irradiation distance is 200 mm. The ratio R indicates the ratio of each maximum illuminance E based on the first comparative example.
In FIG. 8, the reflecting mirror 11 of the first embodiment has an opening width LA of 101.2 mm, the reflecting mirror 111 of the second embodiment has an opening width LC of 92 mm, and the reflection of the first comparative example. Each value is shown when the mirror 211 has an opening width LE of 137.94 mm and is configured so as to have the same focal length including the second comparative example.

As shown in FIG. 8, the reflector 11 of the first embodiment has a maximum illuminance of 836.1 mW / cm ² , and the reflector 111 of the second embodiment has a maximum illuminance of 848.5 mW / cm ² . The reflective mirror 211 of the first comparative example has a maximum illuminance of 982.6 mW / cm ² , and the reflective mirror 311 of the second comparative example has a maximum illuminance of 492.6 mW / cm ² . That is, it turns out that the 1st and 2nd embodiment can obtain 85% or more of illuminance with respect to the maximum illuminance of the first comparative example. On the other hand, the second comparative example can only obtain an illuminance of about 50% with respect to the maximum illuminance of the first comparative example.
As described above, the first and second embodiments can secure an illuminance close to the maximum illuminance obtained in the first comparative example while reducing the size of the first comparative example.

FIG. 9 is a diagram showing the illuminance distribution by irradiation distance of the reflecting mirrors 11 and 111 of the first and second embodiments and the reflecting mirror 211 of the first comparative example. In FIG. 9, the vertical axis indicates the illuminance Y [mW / cm ² ], the horizontal axis indicates the position X in the width direction N, and the position X = 0 is the center position in the width direction N.
In FIG. 9, the illuminance characteristics of the reflecting mirror 11 at positions where the irradiation distances are 200 mm, 250 mm, 300 mm, 350 mm, and 400 mm are indicated by reference numerals f1A, f1B, f1C, f1D, and f1E, respectively. In addition, with respect to the reflecting mirror 111, the illuminance characteristics at positions where the irradiation distances are 200 mm, 250 mm, 300 mm, 350 mm, and 400 mm are respectively indicated by symbols f2A, f2B, f2C, f2D, and f2E. In addition, with respect to the reflecting mirror 211, the illuminance characteristics when the irradiation distances are 200 mm, 250 mm, 300 mm, 350 mm, and 400 mm are respectively indicated by symbols f3A, f3B, f3C, f3D, and f3E. Note that the focal lengths of the elliptical reflecting surfaces (the first reflecting surface 12A, the third reflecting surface 12C, the elliptical reflecting surface 112A, and the elliptical reflecting surfaces 212A and 212B) of the reflecting mirrors 11, 111, and 211 are all 195 mm. is there.

As shown in FIG. 9, when the irradiation distance was 200 mm, the reflecting mirror 211 of the first comparative example showed the highest maximum illuminance (about 980 mW / cm ² ). The reflecting mirrors 11 and 111 of the first and second embodiments have the same maximum illuminance (about 830 to 850 mW / cm ² ), which is 80% or more of the maximum illuminance of the reflecting mirror 211 of the first comparative example.
On the other hand, when the irradiation distance is 250 mm or more, the reflecting mirrors 11 and 111 of the first and second embodiments showed higher maximum illuminance than the reflecting mirror 211 of the first comparative example. Moreover, when the irradiation distance is 250 mm or more and the reflecting mirrors 11 and 111 of the first and second embodiments are compared, the reflecting mirror 111 of the second embodiment is higher than the reflecting mirror 11 of the first embodiment. Illuminance was shown.
From these results, the reflecting mirrors 11 and 111 of the first and second embodiments can obtain the maximum illuminance comparable to that of the reflecting mirror 211 of the first comparative example, and in particular, if the irradiation distance is 250 mm or more. Thus, higher illuminance than that of the first comparative example could be obtained.

Next, the wind speed distribution of the first and second embodiments and the first comparative example will be described.
Further, the wind speed distribution is also obtained for the third comparative example having the reflecting mirror 411 that is substantially the same shape as the reflecting mirror 111 of the second embodiment and the rear side end 412D of the reflecting mirror 411R is located in the vicinity of the reference plane M1. Examined.

FIG. 10A is a diagram showing the wind speed distribution of the cooling air according to the first embodiment, FIG. 10B is a diagram showing the wind speed distribution of the cooling air according to the second embodiment, and FIG. The figure which shows the wind speed distribution of the cooling wind of 1 comparative example, FIG.10 (D) is a figure which shows the wind speed distribution of the cooling wind of a 3rd comparative example. 10 (A) to 10 (D), a location where the wind speed is relatively high is indicated by a high speed location V1, an intermediate location is indicated by a medium speed location V2, and a low location is indicated by a low speed location V3.
As shown in FIG. 10A, a medium speed point V2 continues from the front surface to the back surface on the outside of the reflecting mirror 11 of the first embodiment, and the inside of the reflecting mirror 11 also has a back surface (back surface). The medium speed point V2 continues toward the opening 12F). Further, since the vicinity of the rear opening 12F is the high speed portion V1, it can be seen that the cooling air smoothly flows through the rear opening 12F. Therefore, it can be seen that the cooling air smoothly flows around the reflecting mirror 11 and the linear light source 10.

As shown in FIG. 10B, also in the second embodiment, the medium speed point V2 continues from the front to the back on the inside and outside of the reflecting mirror 111, and the vicinity of the back opening 112F is the high speed point V1. Therefore, the cooling air smoothly flows around the reflecting mirror 111 and the linear light source 10.
As shown in FIG. 10C, also in the first comparative example, the medium speed point V2 is continuous from the front surface to the back surface inside and outside the reflecting mirror 211, and the vicinity of the rear opening 212F is the high speed point V1. Therefore, it can be seen that the cooling air smoothly flows around the reflecting mirror 211 and the linear light source 10.
In the third comparative example shown in FIG. 10D, the rear opening 112F is narrower than in the second embodiment shown in FIG. For this reason, in the third comparative example, the cooling air speed is reduced between the linear light source 10 and the reflecting mirror 411 as compared with the second embodiment. For this reason, it is disadvantageous for cooling.

Next, for the embodiment and the comparative example shown in FIG. 10, the average temperature T1, the minimum temperature T2, and the maximum temperature T3 of the reflecting mirrors 11, 111, 211, and 411 were examined. In FIG. 11, each temperature T1-T3 is shown by the ratio on the basis of the 1st comparative example.
As shown in FIG. 11, with respect to the reflecting mirror 11 of the first embodiment, the average temperature T1 is increased by 24% compared to the first comparative example, and the minimum temperature T2 and the maximum temperature T3 are the same as those of the first comparative example. Compared to 1 to 6% of the range. Thus, it can be seen that the first embodiment has no significant difference in cooling compared to the first comparative example.
Moreover, about the reflective mirror 111 of 2nd Embodiment, average temperature T1 rises 22% compared with a 1st comparative example, and 0-10 compared with a 1st comparative example about the minimum temperature T2 and the maximum temperature T3. It rose in the range of%. Thus, it can be seen that the second embodiment also has no significant difference in cooling compared to the first comparative example.

  On the other hand, with respect to the reflecting mirror 411 of the third comparative example, the average temperature T1 is increased by 44% compared to the first comparative example, and the minimum temperature T2 and the maximum temperature T3 are 3 to 46 compared with the first comparative example. It rose in the range of%. From this, it can be seen that the temperature of the third comparative example rises compared to the first and second embodiments and the first comparative example.

As described above, according to the present embodiment, the reflecting mirrors 11 and 111 are the first reflecting surface 12A that functions as the main reflecting surface that reflects the ultraviolet rays of the linear light source 10 toward the predetermined location F, and the ellipse. It has a reflective surface 112A. Further, the reflecting mirrors 11 and 111 function as a circular reflecting surface that collects the ultraviolet rays of the linear light source 10 at the position where the linear light source 10 is disposed, and enters the main reflecting surface and collects it at a predetermined location F. 2 reflective surface 12B and circular reflective surface 112B are provided.
According to this configuration, as shown in FIG. 6 to FIG. 9 and the like, it is possible to efficiently secure the maximum illuminance while reducing the size of the reflecting mirrors 11 and 111, and close to the three-dimensional workpiece W. Can irradiate ultraviolet rays with sufficient illuminance.

In addition, the circular reflecting surfaces (second reflecting surface 12B and circular reflecting surface 112B) are arranged farther from the linear light source 10 than the main reflecting surfaces (first reflecting surface 12A and elliptical reflecting surface 112A). The cooling air can easily flow between the circular reflection surface (the second reflection surface 12B and the circular reflection surface 112B) and the linear light source 10, and the temperature increase on the circular reflection surface side can be suppressed. The main reflection surface (the first reflection surface 12A and the elliptical reflection surface 112A) is separated from the linear light source 10 as it goes to the workpiece W side as shown in FIGS. The temperature rise is also suppressed.
Therefore, it is possible to achieve both downsizing of the reflecting mirrors 11 and 111 and suppression of temperature rise.

  As shown in FIG. 2, the first reflecting surface 12A and the second reflecting surface 12B, which is a circular reflecting surface, are connected in this order from the linear light source 10 side to the predetermined location F side. The second reflecting surface 12 </ b> B is disposed closer to the predetermined location F than the position of the linear light source 10. According to this configuration, the second reflecting surface 12B is narrower on the side of the predetermined portion F than the side of the linear light source 10, and prevents the increase in the width of the reflecting mirror 11 while allowing more light to pass through the first reflecting surface. It can be condensed with 12A.

  Moreover, as shown in FIG. 2, since the third reflection surface 12C, which is another reflection surface connected to the predetermined location F side of the second reflection surface 12B and reflects ultraviolet rays toward the predetermined location F, is provided. As shown in the first comparative example in FIG. 5, the width of the reflecting mirror 11 can be shortened compared to the case where light in the range reflected by the first to third reflecting surfaces 12 </ b> A to 12 </ b> C is reflected by one elliptical reflecting surface. .

  The first reflective surface 12A is an elliptical reflective surface that condenses the ultraviolet rays of the linear light source 10 at a predetermined location F, and the third reflective surface 12C has the same focal point as the elliptical reflective surface, and It is another elliptical reflecting surface having a minor axis shorter than the minor axis of the elliptical reflecting surface. According to this configuration, the width of the reflecting mirror 11 can be shortened as compared with the case where the third reflecting surface 12C is an elliptical reflecting surface having the same or longer short axis as that of the first reflecting surface 12A.

Further, as shown in FIGS. 3 and 4, the elliptical reflecting surface 112 </ b> A and the circular reflecting surface 112 </ b> B are disposed to face each other with the linear light source 10 interposed therebetween. According to this configuration, the width of the reflecting mirror 111 can be shortened as shown in FIG.
Further, as shown in FIG. 4, the back surface side end portion 112D of the circular reflection surface 112B is separated from the back surface side end portion 112C of the elliptical reflection surface 112A, and the ultraviolet light reflected by the circular reflection surface 112B is elliptically reflected. It is provided in a range incident on the surface 112A. According to this configuration, it is possible to avoid a situation where the back side end 112D of the circular reflection surface 112B extends to a range where the reflected ultraviolet light does not enter the elliptical reflection surface 112A. Thus, a wide back opening 112F suitable for flowing cooling air can be formed between the circular reflecting surface 112B and the elliptical reflecting surface 112A.

  In addition, when the distance between the focal points of the main reflection surface (the first reflection surface 12A and the ellipsoidal reflection surface 112A), which is an elliptical reflection surface, is 195 mm, the distance from the linear light source 10 to the predetermined location F is 250 mm or more. As a result, as shown in FIG. 9, a maximum illuminance higher than that of the reflecting mirror 211 of the first comparative example is obtained. This makes it possible to obtain a higher maximum illuminance in addition to downsizing the reflecting mirrors 11 and 111 and suppressing temperature rise.

  The above-described embodiment is merely an example of one aspect of the present invention, and can be arbitrarily modified and applied within the scope of the gist of the present invention.

For example, in the second embodiment, the ellipsoidal reflecting surface 112A may be arranged at the focal point to provide a parabolic reflecting surface that reflects toward the predetermined location F.
FIG. 12A is a view showing a modification in which the reflecting mirror 111L of the second embodiment is replaced with a reflecting mirror 511 having a parabolic reflecting surface 512A. In this modification, ultraviolet rays are irradiated toward the planar predetermined portion F with a substantially uniform illuminance. FIG. 12B shows a fourth comparative example in which the reflecting mirrors 211L and 211R of the first comparative example are replaced with reflecting mirrors 611L and 611R having the same parabolic reflecting surfaces 611A and 611B as the parabolic reflecting surface 512A. FIG.

  As shown in FIG. 12A, it is clear that the width of the reflecting mirror 511 including the reflecting mirrors 511L and 111R can be reduced in this modified example as compared with the fourth comparative example shown in FIG. is there. Further, since the ultraviolet light of the linear light source 10 is reflected by the circular reflecting surface 112B and then incident on the parabolic reflecting surface 512A and irradiated to the predetermined portion F, the maximum illuminance can be efficiently secured.

FIG. 13 is a diagram illustrating the illuminance distribution by irradiation distance of the reflecting mirror 511 of the modified example and the reflecting mirror 611 of the fourth comparative example. In addition, regarding the reflecting mirror 511, the illuminance characteristics at positions where the irradiation distances are 200 mm, 250 mm, 300 mm, 350 mm, and 400 mm are respectively indicated by symbols f4A, f4B, f4C, f4D, and f4E. In addition, with respect to the reflecting mirror 611, the illuminance characteristics at positions where the irradiation distances are 200 mm, 250 mm, 300 mm, 350 mm, and 400 mm are respectively indicated by symbols f5A, f5B, f5C, f5D, and f5E.
As shown in FIG. 13, the reflection mirror 511 of the modified example was able to obtain a maximum illuminance higher than that of the parabolic reflection mirror 611 of the fourth comparative example at all the measured irradiation distances.

  The present invention is not limited to the ultraviolet irradiators 1 and 20 that irradiate ultraviolet rays, and can be applied to an irradiator that irradiates light having an arbitrary wavelength such as visible light or infrared light. Further, the linear light source 10 is not limited to a lamp light source such as a discharge lamp, and for example, a light source in which light emitting elements are arranged linearly may be used.

DESCRIPTION OF SYMBOLS 1, 20, 30 Ultraviolet irradiator 2 1st housing | casing 2A, 5A Opening part 3 Light source unit 4 Cover glass 5 2nd housing | casing 10 Linear light source 10A Central axis 11, 11L, 11R, 111, 111L, 111R, 211, 211L, 211R, 311, 311L, 311R, 411, 411R, 511, 611 Reflective mirror 12A First reflective surface (main reflective surface)
12B Second reflecting surface (circular reflecting surface)
12C 3rd reflective surface (elliptical reflective surface)
12F, 212F Rear opening 112A, elliptical reflecting surface (main reflecting surface)
112B Circular reflecting surface 212A, 212B Elliptical reflecting surface 512A Parabolic reflecting surface (main reflecting surface)
F Predetermined location LA, LC, LE Opening width LB, LD, LF Case width N Width direction W Workpiece

Claims (8)

A linear light source that emits ultraviolet light;
In an ultraviolet irradiator comprising a reflecting mirror that surrounds the linear light source and irradiates the ultraviolet rays to a predetermined location,
The reflector is
A main reflection surface that reflects the ultraviolet rays of the linear light source toward the predetermined location;
A circular reflection surface that condenses the ultraviolet rays of the linear light source at an arrangement position of the linear light source, is incident on the main reflection surface, and is condensed at the predetermined location;
The ultraviolet irradiator, wherein the circular reflection surface is arranged farther from the linear light source than the main reflection surface. The main reflection surface and the circular reflection surface are connected in this order from the side of the linear light source toward the predetermined location,
2. The ultraviolet irradiator according to claim 1, wherein the circular reflection surface is disposed closer to the predetermined portion than the position of the linear light source. The reflector is
3. The ultraviolet irradiator according to claim 2, further comprising another reflecting surface that is connected to the predetermined location side of the circular reflecting surface and reflects the ultraviolet rays of the linear light source toward the predetermined location. The main reflection surface is an elliptical reflection surface that collects ultraviolet rays of the linear light source at the predetermined location,
The said other reflective surface is an elliptical reflective surface which has the same focus as the said elliptical reflective surface, and has a short axis shorter than the short axis of the said elliptical reflective surface. UV irradiator.   The ultraviolet irradiator according to claim 1, wherein the main reflection surface and the circular reflection surface are arranged to face each other with the linear light source interposed therebetween.   The end portion of the circular reflecting surface is spaced from the end portion of the main reflecting surface, and is provided in a range in which the ultraviolet light reflected by the circular reflecting surface is incident on the main reflecting surface. 5. The ultraviolet irradiator according to 5.   The ultraviolet irradiator according to claim 5, wherein the main reflection surface is an elliptical reflection surface that collects ultraviolet rays of the linear light source at the predetermined location.   The ultraviolet irradiator according to claim 5 or 6, wherein the main reflection surface is a parabolic reflection surface on which the linear light source is disposed at a focal point.

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