JP2019116418A - Light irradiation device - Google Patents

Abstract

To provide a light irradiation device having a planar light source as a light source.SOLUTION: A light irradiation device comprises: a reflection plane which is arranged in a concave inner surface formed in an arc shape and into which a wire is inserted; a light source that irradiates light from one side in the circumferential direction of the wire toward the wire; and an insertion part that has an insertion path formed therein for inserting the wire into the reflection plane. The light source is a planar light source that applies light from an area having a certain width in a cross-section perpendicular to the direction in which the wire extends. The insertion part is formed in a cylindrical shape so that the insertion path having a circular shape can be formed therein. The width dimension of the light source is larger than the inside diameter of the insertion part.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a light irradiation device.

  Conventionally, as a light irradiation apparatus, a light irradiation apparatus provided with a plurality of light sources which irradiate light toward a wire introduced into the inside of the apparatus is known (for example, Patent Document 1).

JP, 2010-117531, A

  Then, a subject is providing the light irradiation apparatus which has a light source of a surface light source.

  The light irradiation device is disposed on a concave inner surface formed in an arc shape, and a reflective surface in which the wire is inserted, and a light source for emitting light toward the wire from one side in the circumferential direction of the wire. And an insertion portion for forming the insertion path for inserting the wire into the reflecting surface, and the light source is provided from a region having a width in a cross section perpendicular to the extending direction of the wire. The insertion portion is a surface light source for emitting light, and the insertion portion is formed in a cylindrical shape so as to form the circular insertion path inside, and the width dimension of the light source is larger than the inner diameter of the insertion portion .

  In the light irradiation device, the light source may be disposed outside the reflective surface in a cross section taken along a plane orthogonal to the longitudinal direction of the wire.

  In addition, the light irradiation device includes an opening formed on one side in the circumferential direction of the reflection surface, and a light transmitting unit covering the opening, and the light source passes through the light transmitting unit. The configuration may be such that the wire is arranged to be irradiated with light.

  The light irradiation device may be configured to include a light source unit having the light source and the light transmitting portion, and an insertion unit having the reflection surface and movably connected to the light source unit.

  Further, the light irradiation device may include a fixing portion that fixes the insertion portion, and the fixing portion may be disposed on both sides of the light source so as to sandwich the light source in the direction in which the wire extends.

It is a general view of the light irradiation apparatus which concerns on one Embodiment, Comprising: It is a figure which shows the state in which the wire is inserted. It is a whole front view of the light irradiation apparatus concerning the embodiment. It is a whole side view of the light irradiation apparatus concerning the embodiment. It is a general view of the light irradiation apparatus which concerns on the embodiment, Comprising: The IV-IV line expanded sectional view of FIG. 2 is shown. It is V area | region enlarged view of FIG. 4 of the light irradiation apparatus which concerns on the embodiment. It is principal part sectional drawing of the insertion unit which concerns on the same embodiment. It is the VII-VII sectional view taken on the line of FIG. 6 of the insertion unit which concerns on the embodiment. It is the VIII-VIII sectional view taken on the line of FIG. 6 of the insertion unit which concerns on the embodiment. It is principal part sectional drawing of the light irradiation apparatus which concerns on a comparative example, Comprising: It is a figure explaining the irradiation state of the light to a wire. It is an important section sectional view of the light irradiation device concerning an example, and is a figure explaining the irradiation state of the light to a wire. It is an important section sectional view of a light irradiation device concerning other embodiments, and is a figure explaining arrangement of a light source. It is a principal part sectional view of a light irradiation device concerning further another embodiment, and is a figure explaining arrangement of a light source. It is principal part sectional drawing of the reflective surface which concerns on other embodiment. It is principal part sectional drawing of the reflective surface which concerns on other embodiment. It is principal part sectional drawing of the light irradiation apparatus which concerns on other embodiment. It is principal part sectional drawing of the light irradiation apparatus which concerns on other embodiment. It is principal part sectional drawing of the light irradiation apparatus used for evaluation of an Example and a comparative example. It is a graph which shows the relationship between the position of the circumferential direction of a wire, and illumination intensity. It is a graph which shows the relationship between the eccentricity amount of the center of a wire and the center of a reflective surface, and the standard deviation in the illumination intensity of each position of the circumferential direction of a wire. It is a graph which shows the relationship between the position of the circumferential direction of a wire, and illumination intensity. It is a graph which shows the relationship between the eccentricity amount of the center of a wire, and the center of a reflective surface, and light efficiency. It is a graph which shows the relationship between the eccentricity amount of the center of a wire, and the center of a reflective surface, and light efficiency.

  Hereinafter, an embodiment of the light irradiation apparatus will be described with reference to FIGS. Note that in each drawing (same as in FIGS. 11 to 17), the dimensional ratio of the drawings and the actual dimensional ratio do not always match, and the dimensional ratio between the respective drawings also does not necessarily match. Absent.

  As shown in FIG. 1, the light irradiation apparatus 1 according to the present embodiment is used in an optical fiber manufacturing apparatus 100 for manufacturing an optical fiber. Therefore, prior to describing each configuration of the light irradiation device 1, the optical fiber manufacturing device 100 will be described.

  The optical fiber manufacturing apparatus 100 includes a transport device 110 that transports the optical fiber 200, and a coating device 120 that applies the ultraviolet curable resin to the transported optical fiber 200. Then, the conveying device 110 holds the optical fiber 200 while conveying the conveying members 111 and 112 on the upstream side of the light irradiation device 1 so that the optical fiber 200 is inserted into a predetermined position inside the light irradiation device 1. And downstream respectively.

  Then, the light irradiation device 1 cures the resin applied to the optical fiber 200 by, for example, irradiating the optical fiber 200 traveling the inside at a speed of 1000 meters per minute with ultraviolet light. Thus, the optical fiber 200 manufactured by the optical fiber manufacturing apparatus 100 is configured of, for example, a bare optical fiber made of glass fiber and a coating film obtained by curing an ultraviolet curable resin.

  As shown in FIGS. 2 to 4, the light irradiation device 1 according to the present embodiment includes a light source unit 2 for irradiating light toward an optical fiber (wire rod) 200, and an insertion unit 3 into which the optical fiber 200 is inserted. Is equipped. Moreover, the light irradiation apparatus 1 is provided with the connection part 4 which connects the light source unit 2 and the insertion unit 3 rotatably by the rotating shaft 4a.

  The light source unit 2 includes a light source 21 that emits light toward the optical fiber 200, a light source cooling unit 22 that cools the light source 21, and a housing 23 that houses the light source 21 and the like. The light source unit 2 further includes a power supply unit 24 for supplying power to the light source 21.

  The light source 21 is formed to be elongated along the extending direction (transport direction) D1 of the optical fiber 200. The light source 21 is disposed to face the optical fiber 200. In the present embodiment, the light source 21 is a substrate having a light emitting element (LED), that is, a light emitting element mounting substrate (LED mounting substrate). Further, in the present embodiment, the light source 21 emits ultraviolet light (for example, light with a wavelength of 300 nm to 400 nm) in order to cure the ultraviolet curable resin.

  The light source cooling unit 22 is connected to the light source 21 and has a cooling body 22a through which the cooling water flows, an inflow portion 22b for flowing the cooling water into the cooling body 22a, and a flow of the cooling water from the cooling body 22a. And the outlet 22c of the The cooling main body 22 a is disposed inside the housing 23, and the inflow portion 22 b and the outflow portion 22 c are disposed outside the housing 23.

  The housing 23 includes a light transmitting portion 23 a that transmits the light emitted from the light source 21 and a light shielding portion 23 b that shields the light. The light transmitting portion 23 a is formed to be long along the extending direction (conveying direction) D 1 of the optical fiber 200. The light transmitting portion 23 a is disposed to face the light source 21. Thus, the light transmitting portion 23 a is disposed between the light source 21 and the optical fiber 200.

  The power supply unit 24 variously connects, for example, the power supply connection unit 24 a to which a cable or the like is connected, and the power supply connection unit 24 a and the light source 21 in order to supply power from the outside. And a terminal block 24b having the following terminals. The power supply connection portion 24 a is disposed outside the housing 23, and the terminal block 24 b is disposed inside the housing 23.

  The insertion unit 3 includes a body portion 5 into which the optical fiber 200 is inserted, an insertion portion 6 in which an insertion path 61 for inserting the optical fiber 200 into the body 5 is formed, and an insertion portion 6 And a fixing portion 7 for fixing the main body 5 to the main body 5. In addition, the insertion unit 3 includes a main body cooling unit 8 that cools the main body unit 5.

  The main body cooling portion 8 is connected to the main body portion 5 and has a cooling main body 8a through which the cooling water flows, an inflow portion 8b for flowing the cooling water into the cooling main body 8a, and a cooling water from the cooling main body 8a. And an outflow portion 8c. The main body cooling unit 8 (cooling main body 8 a) is configured to be attachable to and detachable from the main body unit 5.

  As shown in FIGS. 4 and 5, the main body portion 5 is formed to be elongated along the extending direction (transport direction) D1 of the optical fiber 200. Further, the main body portion 5 includes a concave portion 51 into which the optical fiber 200 is inserted along the longitudinal direction. And the concave part 51 equips the inner surface formed in circular arc shape with the reflective surface 52 which reflects light. In addition, the concave portion 51 is provided with one opening 53 on one side in the circumferential direction of the reflecting surface 52.

  The reflecting surface 52 is formed to be long along the extending direction (the conveying direction) D1 of the optical fiber 200. And the reflective surface 52 is formed by the curved surface. Specifically, the reflection surface 52 is formed in an arc shape including a part of a true circle in a cross section perpendicular to the longitudinal direction. And the reflective surface 52 is formed in the magnitude | size which can insert the insertion part 6 inside.

  The opening 53 is formed long along the extending direction (transport direction) D1 of the optical fiber 200. The opening 53 is covered by the light transmitting portion 23 a and disposed so as to face the light source 21. Thereby, the light of the light source 21 is irradiated to the optical fiber 200 inside the reflective surface 52 via the light transmitting portion 23 a and the opening 53. Accordingly, the light source 21 emits light from one side in the circumferential direction of the optical fiber 200 toward the optical fiber 200.

  The insertion portion 6 is provided with an insertion hole 62 forming an insertion path 61 inside, and the insertion hole 62 is disposed inside and outside of the reflective surface 52. Specifically, the insertion portion 6 is formed of a translucent cylindrical body, and is disposed across the inside and the outside of the reflecting surface 52. And the insertion hole 62 is formed in circular shape in the cross section by the surface orthogonal to a longitudinal direction. That is, the insertion hole 62 forms a circular insertion path 61 inside.

  In the present embodiment, the insertion portion 6 is a quartz tube, and the inside thereof is filled with nitrogen. Then, when the resin on the surface of the optical fiber 200 cures, volatile matter is generated, and thus the insertion portion 6 prevents the volatile matter from adhering to the light source unit 2 (light transmitting portion 23a) and the reflecting surface 52. ing.

  As shown in FIG. 5, the insertion portion 6 (insertion hole 62) is disposed such that the center 61 a of the insertion path 61 is decentered with respect to the arc-shaped center 52 a of the reflection surface 52. Specifically, in the insertion portion 6 (insertion hole 62), the direction in which the center 61a of the insertion path 61 is in contact with or separated from the light source 21 with respect to the arc-shaped center 52a of the reflection surface 52 (more specifically, the light source 21 Is arranged to be eccentric in the direction away from

  In the present embodiment, the arrangement of the light source 21 and the reflecting surface 52 is line symmetrical (in the third direction D3 in FIG. 5). As described above, in the case where the arrangement of the light source 21 and the reflection surface 52 is line-symmetrical, the direction in which the light source 21 is in contact with or separated from the light source 21 is the direction of the reference line that is line-symmetrical.

  The arc-shaped center 52 a of the reflecting surface 52 is the center of the inscribed circle inscribed in the reflecting surface 52. The center 61 a of the insertion path 61 is the center of the inscribed circle inscribed in the surface (in the present embodiment, the inner surface of the insertion hole 62) constituting the insertion path 61.

  As shown in FIGS. 6 and 7, the main body portion 5 is provided with reflecting end faces 54 for reflecting light at both end portions in the longitudinal direction. The reflective end surface 54 is disposed to cover a part of the gap between the insertion portion 6 and the reflective surface 52.

  As shown in FIGS. 6 and 8, the fixing unit 7 includes a pair of holding portions 71 and 72 that hold the insertion portion 6. The fixing portion 7 holds the end portion in the longitudinal direction of the insertion portion 6 by the pair of holding portions 71 and 72 so that the end portion in the longitudinal direction of the insertion portion 6 and the end portion in the longitudinal direction of the main body portion 5 Is fixed.

  The configuration of the light irradiation device 1 according to the present embodiment is as described above, and next, an example of the operation and effect by decentering the center of the wire 200 with respect to the arc-shaped center 52a of the reflection surface 52 is shown in FIG. And FIG. 10 will be described.

  In the comparative example according to FIG. 9, the center of the wire 200 coincides with the arc-shaped center 52 a of the reflective surface 52. In such a configuration, in order to illuminate the back side of the wire 200 (the side opposite to the side facing the light source 21 and the lower side in FIGS. 9 and 10), the arc shape of the reflecting surface 52 is used. After passing near the center 52a, it is necessary to reflect on the reflective surface 52 (see the broken line in FIG. 9).

  However, light passing through the vicinity of the arc-shaped center 52a of the reflecting surface 52 irradiates the front side of the wire 200 (the surface facing the light source 21 and the upper surface in FIGS. 9 and 10). (See the two-dot chain line in FIG. 9). Therefore, the back side of the wire 200 is less likely to be irradiated with light than the front side of the wire 200. Thereby, in the comparative example which concerns on FIG. 9, light can not be uniformly irradiated over the circumferential direction of the wire 200. As shown in FIG.

  Further, when the arc-shaped reflection surface 52 is used, the light is not irradiated to the side surfaces (the left surface side and the right surface side in FIG. 9) of the wire 200 disposed at the arc-shaped center 52 a of the reflection surface 52. This is because the ray of light directed to the arc-shaped center 52 a of the reflecting surface 52 is geometrically formed perpendicular to the reflecting surface with the direct light from the light source 21 disposed on one side of the wire 200 in the circumferential direction. This is because the range of the direct light and the reflected light directed to the arc-shaped center 52 a is limited to the front side and the back side because only the reflected light of the incident light is made. As a result, it is difficult for the light to be irradiated on the side surface side, and it becomes even more difficult for the uniform light irradiation to extend in the circumferential direction of the wire 200.

  On the other hand, in the embodiment according to FIG. 10, the center of the wire 200 is decentered with respect to the arc-shaped center 52 a of the reflecting surface 52. In such a configuration, light need not pass through the position of the wire 200 in order to illuminate the back side of the wire 200. Therefore, light is irradiated to the back side of the wire 200 in the same manner as the front side of the wire 200. Furthermore, the light is also suitably applied to the side of the wire 200.

  Thereby, in the Example which concerns on FIG. 10, light can be uniformly irradiated over the circumferential direction of the wire 200. FIG. As described above, when the center of the wire 200 is decentered with respect to the arc-shaped center 52 a of the reflection surface 52, light can be uniformly irradiated in the circumferential direction of the wire 200.

  Next, an example of the effect by decentering the center of the wire 200 in the direction away from the light source 21 with respect to the arc-shaped center 52 a of the reflecting surface 52 will be described.

  In contrast to the configuration in which the position of the wire 200 moves away from the light source 21, in the configuration in which the position of the wire 200 approaches the light source 21, for example, much of the light emitted from the light source 21 is directly irradiated to the wire 200. As a result, the amount of light reflected by the reflection surface 52 is reduced, and the amount of light irradiated to the back side of the wire 200 is reduced.

  Further, in a configuration in which the position of the wire 200 approaches the light source 21 with respect to the configuration in which the position of the wire 200 is separated from the light source 21, for example, the back side of the wire 200 is separated from the reflective surface 52. Thereby, the light which irradiates the back side of the wire 200 decreases.

  As described above, in the configuration in which the position of the wire 200 approaches the light source 21, the back side of the wire 200 tends to be less likely to be irradiated with light than the front side of the wire 200. Thus, by decentering the center of the wire 200 in the direction away from the light source 21 with respect to the arc-shaped center 52 a of the reflection surface 52, light can be irradiated more uniformly over the circumferential direction of the wire 200. .

  As described above, the light irradiation method according to the present embodiment is a light irradiation method in which the light irradiation device 1 irradiates light toward the wire rod 200, and the light irradiation device 1 has a concave inner surface formed in an arc shape. And a light source 21 for emitting light toward the wire 200 from one side in the circumferential direction of the wire 200, in the light irradiation method, the center of the wire 200 is the reflection Inserting the wire 200 into the reflecting surface 52 so as to be decentered with respect to the arc-shaped center 52 a of the surface 52; and irradiating light from the light source 21 toward the wire 200; Including.

  According to such a method, the center of the wire 200 inserted inside the reflective surface 52 is decentered with respect to the arc-shaped center 52 a of the reflective surface 52. And the light from the light source 21 is irradiated toward the wire 200. Thereby, even if light is irradiated toward the wire 200 from one side of the circumferential direction of the wire 200, light can be uniformly irradiated over the circumferential direction of the wire 200.

  Moreover, the light irradiation apparatus 1 which concerns on this embodiment is arrange | positioned at the concave inner surface formed in circular arc shape, and the reflective surface 52 in which the said wire 200 is inserted inside, and one side of the circumferential direction of the said wire 200 The light source 21 for emitting light toward the wire 200, and the insertion portion 6 for forming the insertion path 61 for inserting the wire 200 into the inside of the reflection surface 52, and the insertion path 61 The center 61 a of the lens 52 is decentered with respect to the arc-shaped center 52 a of the reflecting surface 52.

  According to such a configuration, the insertion portion 6 forms the insertion path 61 for inserting the wire 200 into the inside of the reflection surface 52. Since the center 61 a of the insertion path 61 is eccentric to the arc-shaped center 52 a of the reflecting surface 52, the center of the wire 200 inserted inside the insertion portion 6 is the arc-shaped center of the reflecting surface 52. It is eccentric to 52a. Thereby, even if light is irradiated toward the wire 200 from one side of the circumferential direction of the wire 200, light can be uniformly irradiated over the circumferential direction of the wire 200.

  Further, in the light irradiation device 1 according to the present embodiment, the center 61 a of the insertion path 61 is decentered in a direction away from the light source 21 with respect to the arc-shaped center 52 a of the reflection surface 52. is there.

  According to such a configuration, the center 61 a of the insertion path 61 is decentered with respect to the arc-shaped center 52 a of the reflecting surface 52 in the direction away from the light source 21. Therefore, the center of the wire 200 inserted into the inside of the insertion portion 6 is decentered in the direction away from the light source 21 with respect to the arc-shaped center 52 a of the reflection surface 52.

  Thus, for example, in the light emitted from the light source 21, not only the light directly irradiated to the wire 200 but also the light reflected by the reflection surface 52 can be secured. In addition, for example, it can also be suppressed that the back side of the wire 200 is separated from the reflecting surface 52 too much. Therefore, even if light is irradiated toward the wire 200 from one side of the wire 200 in the circumferential direction, the light can be uniformly irradiated over the circumferential direction of the wire 200.

  Further, in the light irradiation device 1 according to the present embodiment, the insertion portion 6 includes the insertion hole 62 forming the insertion path 61 inside, and the insertion hole 62 is the inside and outside of the reflection surface 52. The center 61 a of the insertion path 61 is arranged to be decentered with respect to the arc-shaped center 52 a of the reflecting surface 52 at least on one side (specifically, inside and outside).

  According to such a configuration, the insertion hole 62 forms the insertion path 61 inside, and is disposed at least one of the inside and the outside of the reflection surface 52 (specifically, the inside and the outside). The insertion hole 62 is arranged such that the center 61 a of the insertion path 61 is eccentric to the arc-shaped center 52 a of the reflecting surface 52. Thereby, by inserting the wire 200 into the insertion hole 62, the center of the wire 200 is surely decentered with respect to the arc-shaped center 52a of the reflection surface 52.

  Moreover, in the light irradiation apparatus 1 which concerns on this embodiment, the said reflective surface 52 is a structure of being formed by a curved surface.

  In addition, a light irradiation apparatus and the light irradiation method are not limited to the structure of above-described embodiment, Moreover, it is not limited to the above-mentioned effect. Further, it goes without saying that various modifications can be made to the light irradiation device and the light irradiation method without departing from the scope of the present invention. For example, as a matter of course, one or a plurality of configurations, methods, and the like according to various modifications described below may be arbitrarily selected and adopted as the configuration, the method, and the like according to the above-described embodiment.

  In the light irradiation apparatus 1 and the method according to the above embodiment, one light source 21 is provided. However, the light irradiation apparatus and method are not limited to such a configuration. For example, as shown in FIGS. 11 and 12, a plurality of light sources 21 may be provided. Further, for example, the plurality of light sources 21 may all have the same output, or, for example, the light sources 21 may have different outputs with respect to at least one other light source 21.

  Here, “the light source for emitting light toward the wire from one side in the circumferential direction of the wire” is one direction D4 with respect to the reference plane S1 including the center of the wire 200 as shown in FIGS. 11 and 12. It refers to a light source 21 that emits light toward the wire 200 from the side. That is, the light irradiation apparatus and method is a light source that irradiates light toward the wire 200 from the other direction D5 side to the reference plane S1 (irradiates light toward the wire 200 from the one direction D4 side to the reference plane S1 Among the light sources 21 that do not have the “auxiliary light source” that is an output of 25% or less of the output of the light source 21 with the largest output,

  Moreover, in the light irradiation apparatus 1 which concerns on the said embodiment, it is the structure that the reflective surface 52 is formed in circular arc shape which consists of a part of perfect circle. However, the light irradiation device is not limited to such a configuration. For example, as shown in FIG. 13, the reflecting surface 52 may be formed in an arc shape consisting of a part of an ellipse, and for example, as shown in FIG. It may be configured to be formed, that is, formed in a polygonal shape, by arranging the flat surface in the arc shape.

Here, “arc-shaped” in “the reflecting surface disposed on the concave inner surface formed in an arc” is the diameter of inscribed circle C 1 inscribed in reflecting surface 52 and circumscribed circle C 2 inscribed in reflecting surface 52. It says that the relation with diameter satisfies the following formula. The inscribed circle and the circumscribed circle of the reflecting surface 52 according to the above embodiment are the same.
100% ≦ (diameter of circumscribed circle) / (diameter of inscribed circle) ≦ 110%

  The arc-shaped center 52 a of the reflecting surface 52 is the center of the inscribed circle (the circle C 1 in FIGS. 13 and 14) of the reflecting surface 52. And the reflective surface 52 should just be formed in the magnitude | size which can insert the optical fiber 200 inside. Further, for example, the reflecting surface 52 may be formed not only in a circular arc shape that is a part of a circular shape, but also in a circular arc shape (that is, a circular shape) that is the entire circular shape.

  By the way, even if a configuration in which the center of the wire 200 is decentered with respect to the focal position of the reflection curved surface is adopted in a reflection curved surface such as an elliptical mirror or a parabolic mirror not satisfying the above formula, the center of the wire 200 The uniformity of the light irradiation in the circumferential direction of the wire 200 is not improved with respect to the configuration in which is positioned at the focal position of the reflection curved surface.

  Moreover, in the light irradiation apparatus 1 which concerns on the said embodiment, the insertion hole 62 is the structure of being formed in circular shape. However, the light irradiation device is not limited to such a configuration. For example, the insertion hole 62 may be formed in an elliptical shape, or, for example, as shown in FIG. 15, the insertion hole 62 may be formed in a polygonal shape. The center 61 a of the insertion path 61 is the center of the inscribed circle (the circle C 3 in FIG. 15) inscribed in the surface constituting the insertion path 61.

  Moreover, in the light irradiation apparatus 1 which concerns on the said embodiment, it is the structure that the insertion hole 62 is arrange | positioned to the inside and the exterior of the reflective surface 52. As shown in FIG. However, the light irradiation device is not limited to such a configuration. For example, the insertion hole 62 may be disposed only inside the reflection surface 52. For example, the insertion hole 62 may be disposed only outside the reflection surface 52.

  Moreover, in the light irradiation apparatus 1 which concerns on the said embodiment, it is the structure that the insertion path 61 is comprised by the insertion hole 62 which is a structure different from the reflective surface 52. FIG. However, the light irradiation device is not limited to such a configuration. For example, the light irradiation device does not include such an insertion hole 62, and as shown in FIG. 16, the reflecting surface 52 constitutes at least a part of the insertion portion 6, and the center 61a of the insertion path 61 is It may be configured to be decentered with respect to the arc-shaped center 52 a of the reflecting surface 52.

  The insertion portion 6 according to FIG. 16 is configured of the reflective surface 52 and the light transmitting portion 23 a of the light source unit 2. And the insertion path 61 is comprised by the interior space comprised by the reflective surface 52 and the light transmission part 23a. The center 61 a of the insertion path 61 is the center of the inscribed circle C 4 inscribed in the surface (in FIG. 16, the surfaces of the reflecting surface 52 and the light transmitting portion 23 a) constituting the insertion path 61.

  Further, in the light irradiation device 1 according to the above-described embodiment, the center 61 a of the insertion path 61 is decentered in the direction away from the light source 21 with respect to the arc-shaped center 52 a of the reflection surface 52. However, the light irradiation device is not limited to such a configuration. For example, the center 61 a of the insertion path 61 may be decentered in the direction approaching the light source 21 with respect to the arc-shaped center 52 a of the reflecting surface 52.

  Also, for example, the center 61 a of the insertion path 61 is perpendicular to the arc 52 c of the reflecting surface 52 with respect to the arc source 52 (for example, the second direction D 2 in FIG. 5 and the opposite direction). It may be configured to be eccentric. However, the center 61a of the insertion path 61 is decentered in a direction (eg, the opposite direction to the third direction D3 in FIG. 5) with respect to the arc-shaped center 52a of the reflecting surface 52 with respect to the light source 21. It is particularly preferable to be decentered in a direction away from the light source 21 (for example, in the direction opposite to the third direction D3 in FIG. 5) with respect to the arc-shaped center 52a of the reflecting surface 52.

  Moreover, in the light irradiation apparatus 1 and method which concern on the said embodiment, it is the structure that the wire 200 is an optical fiber. However, the light irradiation apparatus and method are not limited to such a configuration. For example, the wire 200 may be a fiber. Specifically, the light irradiation apparatus and method may be an apparatus and method for surface modification of fibers by irradiating the wire 200 which is a fiber with ultraviolet light.

  Moreover, in the light irradiation apparatus 1 and method which concern on the said embodiment, it is the structure that the wire 200 is irradiated with light in the state which drive | works the inside of the light irradiation apparatus 1. FIG. However, the light irradiation apparatus and method are not limited to such a configuration. For example, the wire 200 may be configured to be irradiated with light in a state of being fixed to the light irradiation device 1.

  Further, in the light irradiation method according to the above embodiment, the insertion hole 62 is configured such that the center 61 a of the insertion path 61 is decentered with respect to the arc-shaped center 52 a of the reflection surface 52. . However, the light irradiation method is not limited to such a configuration. For example, the center 61a of the insertion path 61 formed by the insertion hole 62 coincides with the arc-shaped center 52a of the reflection surface 52, and the center of the wire 200 is the arc-shaped center 52a of the reflection surface 52 (insertion path 61a The wire 200 may be inserted into the inside of the reflecting surface 52 so as to be decentered with respect to the center 61a) of the.

  Further, in the light irradiation device 1 and method, it is preferable that the reflecting surface 52 occupies 33% (about 120 °) or more in the circumferential direction with respect to the center 52a, and the reflecting surface 52 is at the center 52a. More preferably, the configuration occupies 50% (180 °) or more in the circumferential direction. According to such a configuration, it is possible to suppress the light leaking from the reflection surface 52 to the outside, and to more effectively utilize the light taken into the reflection surface 52.

  Moreover, in the light irradiation device 1 and the method, it is preferable that the reflecting surface 52 occupies 50% (180 °) or more in the circumferential direction. According to such a configuration, it is possible to suppress the light leaking from the reflection surface 52 to the outside, and to more effectively utilize the light taken into the reflection surface 52.

  Further, in the light irradiation device 1 and method, the amount by which the center of the wire 200 (the center 61 a of the insertion path 61) is decentered with respect to the arc-shaped center 52 a of the reflection surface 52 is larger than the radius of the wire 200. A configuration is preferable, and further, a configuration that is larger than the diameter of the wire 200 is more preferable. According to such a configuration, since the arc-shaped center 52 a of the reflective surface 52 is located outside the wire 200, light can be uniformly irradiated in the circumferential direction of the wire 200.

  Here, in order to specifically show the configuration and the effect of the light irradiation device 1, an example of the light irradiation device 1 and a comparative example thereof will be described below with reference to FIGS. 17 to 22.

<Illuminance distribution>
Assuming that light was uniformly irradiated from the entire surface of the light source 21, the illuminance at each position in the circumferential direction of the wire 200 was determined by a ray tracing method. The position of 0 ° in the circumferential direction of the wire 200 is the position of the end point facing the light source 21 (upper end point 200a in FIG. 17), and the position of ± 180 ° in the circumferential direction is the side facing the light source 21 And the opposite end point (the lower end point 200b in FIG. 17).

The illuminance was determined by the light irradiation device 1 under the following conditions.
・ The diameter of reflective surface 52: 42.5 mm
・ Reflectance of reflective surface 52: 85%
The reflecting surface 52 extends to a position on the inner surface of the light transmitting portion 23a (or on the extension of the inner surface of the light transmitting portion 23a).
· Outer diameter of the insertion portion 6: 20 mm
· Inner diameter of the insertion portion 6: 18 mm
・ Transmittance of insertion part 6: 100% (however, Fresnel reflection is considered)
・ Width dimension W1 of light source 21: 20 mm
・ Width dimension W2 of light transmitting part 23a: 26 mm
-The distance W3 from the surface of the light source 21 to the inner surface of the light transmitting portion 23a: 4.5 mm
· Distance W4 from the surface of the light source 21 to the center of the wire 200: 12 mm
・ The diameter of wire rod 200: 0.125 mm
The amount of eccentricity W5 between the center of the wire 200 (the center 61a of the insertion path 61) and the arc-shaped center 52a of the reflective surface 52 is changed by displacing the reflective surface 52 with respect to the light source 21. Since the illuminance changes when the distance between the wire 200 and the light source 21 changes, the positional relationship (distance) between the wire 200 and the light source 21 is not changed.

  FIG. 18 shows the relationship between the circumferential position of the wire 200 and the illuminance (absolute value) in the light irradiation device 1 under the above conditions. The graph X1 shows the illuminance of the comparative example in which the amount of eccentricity W5 is 0 mm, and the graphs X2 to X8 show the illuminance of the embodiment in which the amount of eccentricity W5 is 1 mm, 2 mm, 3 mm, 4 mm, 4.5 mm, 5 mm, 6 mm. Respectively. In each of the eccentricity amounts W5, the center of the wire 200 is decentered relatively in the direction away from the light source 21 as compared with the arc-shaped center 52a of the reflecting surface 52.

  As shown in FIG. 18, with respect to the illuminance X1 of the comparative example in which the amount of eccentricity W5 does not exist, the illuminances X2 to X5 in the embodiment in which the amount of eccentricity W5 exists uniformly irradiate light throughout the circumferential direction of the wire rod 200 It can be done. Thus, the center of the wire 200 is decentered with respect to the arc-shaped center 52 a of the reflecting surface 52, so that light can be uniformly irradiated in the circumferential direction of the wire 200.

  FIG. 19 shows the relationship between the amount of eccentricity W5 and the standard deviation of the illuminance at each position of the wire 200 in the light irradiation device 1 under the above conditions. In the light irradiation device 1 under the above conditions, when the eccentricity amount W5 is 5 mm, the light can be irradiated most uniformly over the circumferential direction of the wire rod 200.

  FIG. 20 shows the relationship between the position of the wire 200 in the circumferential direction and the illuminance (a relative value when the maximum illuminance is 100) in the light irradiation device 1 under the above conditions. The graph Y1 shows the illuminance of the comparative example in which the amount of eccentricity W5 does not exist, and the graphs Y2 to Y3 show the illuminance of the embodiment in which the amount of eccentricity W5 is 4.5 mm, as in FIG.

  The graph Y2 is the illuminance of the embodiment in which the center of the wire 200 is decentered relatively in the direction away from the light source 21 as compared with the arc-shaped center 52a of the reflecting surface 52. The graph Y3 is the illuminance of the embodiment in which the center of the wire 200 is decentered in the direction closer to the light source 21 compared to the arc-shaped center 52a of the reflection surface 52.

  As shown in FIG. 20, the center of the wire 200 with respect to the illuminance Y3 of the embodiment in which the center of the wire 200 is relatively decentered in the direction closer to the light source 21 compared with the arc-shaped center 52a of the reflection surface 52. The illuminance Y2 of the embodiment which is relatively decentered away from the light source 21 compared with the arc-shaped center 52a of the reflecting surface 52 can be further uniformed in the circumferential direction of the wire rod 200.

<Light efficiency>
Assuming that light was uniformly irradiated from the entire surface of the light source 21, the ratio (light efficiency) of the light quantity irradiated to the wire 200 to the light quantity emitted from the light source 21 was determined by a ray tracing method. In the case where light is lost, the light is not incident on the wire 200 but is repeatedly reflected and attenuated by the reflective surface 52, and when the reflected light is incident on the light source 21 and is attenuated, portions other than the reflective surface 52 and the wire 200 When the light is incident on (for example, the light transmitting portion 23a), the light may be attenuated when it is reflected by the reflection surface 52, or may be attenuated when light is transmitted through the insertion portion 6.

  FIG. 21 shows the relationship between the amount of eccentricity W5 and the light efficiency in the light irradiation device 1 under the above conditions. The amount of eccentricity W5 is positive (+) when the center of the wire 200 is relatively decentered away from the light source 21 compared to the arc-shaped center 52a of the reflecting surface 52, and the center of the wire 200 is The case where the light source 21 is relatively decentered relative to the arc-shaped center 52 a of the reflecting surface 52 is taken as minus (−).

  As shown in FIG. 21, the light efficiency of the embodiment in which the amount of eccentricity W5 exists is higher than the light efficiency of the comparative example in which the amount of eccentricity W5 does not exist (the amount of eccentricity W5 is 0 mm). Thereby, the light efficiency can be improved by the center of the wire 200 being relatively decentered as compared with the arc-shaped center 52 a of the reflection surface 52.

  In addition, the center of the wire 200 is the reflective surface in the example (on the minus side) in which the center of the wire 200 is relatively decentered in the direction closer to the light source 21 compared to the arc-shaped center 52a of the reflective surface 52. An embodiment (plus side) which is relatively decentered in the direction away from the light source 21 as compared with the 52 circular center 52a can improve the light efficiency.

  FIG. 22 shows the relationship between the amount of eccentricity W5 and the light efficiency in the light irradiation device 1 in which the diameter of the reflection surface 52 is changed with respect to the light irradiation device 1 under the above conditions. Graphs Z1 to Z4 show the light efficiencies of the embodiments in which the diameter of the reflection surface 52 is 38.5 mm, 41.5 mm, 44.5 mm, and 47.5 mm. The eccentricity amounts W5 are both decentered in the direction in which the center of the wire rod 200 is relatively away from the light source 21 as compared with the arc-shaped center 52a of the reflecting surface 52.

  As shown in FIG. 22, in any of the diameters of the reflecting surfaces 52, the eccentricity W5 does not exist (the eccentricity W5 is 0 mm) with respect to the light efficiency of the comparative example, the eccentricity W5 exists. The light efficiency is high. Thus, regardless of the diameter of the reflection surface 52, the center of the wire 200 is decentered with respect to the arc-shaped center 52a of the reflection surface 52, whereby the light efficiency can be improved. Further, in the light irradiation device 1 under such conditions, regardless of the diameter of the reflecting surface 52, the light efficiency can be most improved when the amount of eccentricity W5 is 5 mm.

  DESCRIPTION OF SYMBOLS 1 ... Light irradiation apparatus, 2 ... Light source unit, 3 ... Insertion unit, 4 ... Connection part, 4a ... Rotation axis, 5 ... Main body part, 6 ... Insertion part, 7 ... Fixed part, 8 ... Main body cooling part, 8a ... Cooling Body, 8b: Inflow part, 8c: Outflow part, 21: Light source, 22: Light source cooling part, 22a: Cooling main body, 22b: Inflow part, 22c: Outflow part, 23: Case, 23a: Translucent part, 23b ... Light shielding part, 24: power supply part, 24a: power supply connection part, 24b: terminal block, 51: concave part, 52: reflective surface, 52a: center, 53: opening, 54: reflective end face, 61: insertion path, 61a ... center, 62 ... insertion hole, 71 ... clamping part, 72 ... clamping part, 100 ... optical fiber manufacturing device, 110 ... conveying device, 111 ... conveying member, 112 ... conveying member, 120 ... coating device, 200 ... wire rod (light Fiber), 200a ... end point, 200b ... end point

Claims (5)

A reflective surface which is disposed on a concave inner surface formed in an arc shape and into which the wire is inserted;
A light source for emitting light toward the wire from one side in the circumferential direction of the wire;
And an insertion portion for forming an insertion path for inserting the wire into the reflection surface.
The light source is a surface light source which emits light from a region having a width in a cross section perpendicular to the extending direction of the wire.
The insertion portion is formed in a cylindrical shape so as to form the circular insertion path therein.
The light irradiation device, wherein the width dimension of the light source is larger than the inner diameter of the insertion portion.   The light irradiation apparatus according to claim 1, wherein the light source is disposed outside the reflective surface in a cross section by a plane orthogonal to the longitudinal direction of the wire. It has an opening formed on one side in the circumferential direction of the reflecting surface, and a light transmitting part covering the opening,
The light irradiation device according to claim 2, wherein the light source is disposed to irradiate light to the wire through the light transmitting unit. A light source unit having the light source and the light transmitting portion;
The light irradiation apparatus according to claim 3, further comprising: an insertion unit having the reflection surface and movably connected to the light source unit. A fixing unit for fixing the insertion unit;
The light irradiation device according to any one of claims 1 to 4, wherein the fixing portion is disposed on both sides of the light source so as to sandwich the light source in a direction in which the wire extends.

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