JP6878762B2 - Light irradiation device and light irradiation method - Google Patents

Description

The present invention relates to a light irradiation device that irradiates light toward a wire rod, and also relates to a light irradiation method in which a light irradiation device irradiates light toward a wire rod.

Conventionally, as a light irradiation device, a light irradiation device including a plurality of light sources that irradiate light toward a wire rod introduced inside the device is known (for example, Patent Document 1). By the way, in the light irradiation device according to Patent Document 1, since light is uniformly irradiated over the circumferential direction of the wire rod, a plurality of light sources are used in the entire circumferential direction of the wire rod (that is, both one side and the other side). Light is radiated toward the wire.

Japanese Unexamined Patent Publication No. 2010-17531

Therefore, the subject is to provide a light irradiation device and a light irradiation method capable of uniformly irradiating light over the circumferential direction of the wire even if the light is irradiated toward the wire from one side in the circumferential direction of the wire. That is.

The light irradiation device is arranged on a concave inner surface formed in an arc shape, and includes a reflective surface into which the wire rod is inserted and a light source that irradiates light toward the wire rod from one side in the circumferential direction of the wire rod. An insertion portion for inserting the wire rod into the inside of the reflection surface is provided with an insertion portion, and the center of the insertion path is eccentric with respect to the arcuate center of the reflection surface. ..

Further, in the light irradiation device, the center of the insertion path may be eccentric with respect to the arcuate center of the reflection surface in a direction away from the light source.

Further, in the light irradiation device, the insertion portion includes an insertion hole forming the insertion path inside, and the insertion hole has the center of the insertion path at least one of the inside and the outside of the reflection surface. It may be arranged so as to be eccentric with respect to the arcuate center of the reflecting surface.

Further, in the light irradiation device, the reflection surface forms at least a part of the insertion portion, and the center of the insertion path is formed so as to be eccentric with respect to the arcuate center of the reflection surface. , May be the configuration.

Further, in the light irradiation device, the reflecting surface may be formed of a curved surface.

Further, in the light irradiation device, the reflection surface may be formed by arranging a plurality of planes in an arc shape.

Further, the light irradiation method is a light irradiation method in which a light irradiation device irradiates light toward a wire rod, and the light irradiation device includes a reflective surface arranged on a concave inner surface formed in an arc shape and the above. A light source that irradiates light toward the wire from one side in the circumferential direction of the wire is provided, and the light irradiation method is such that the center of the wire is eccentric with respect to the arcuate center of the reflection surface. The present invention includes inserting the wire rod into the inside of the reflective surface, and irradiating the wire rod with light from the light source.

As described above, the light irradiation device and the light irradiation method can uniformly irradiate the wire in the circumferential direction even if the light is irradiated toward the wire from one side in the circumferential direction of the wire. It has an excellent effect.

It is the whole view of the light irradiation apparatus which concerns on one Embodiment, and is the figure which shows the state which the wire rod is inserted. It is an overall front view of the light irradiation apparatus which concerns on the same embodiment. It is an overall side view of the light irradiation apparatus which concerns on the same embodiment. It is the whole view of the light irradiation apparatus which concerns on the same embodiment, and shows the IV-IV line enlarged sectional view of FIG. It is a V region enlarged view of FIG. 4 of the light irradiation apparatus which concerns on the same embodiment. It is sectional drawing of the main part of the insertion unit which concerns on the same embodiment. FIG. 6 is a cross-sectional view taken along the line VII-VII of FIG. 6 of the insertion unit according to the same embodiment. FIG. 6 is a sectional view taken along line VIII-VIII of FIG. 6 of the insertion unit according to the same embodiment. It is sectional drawing of the main part of the light irradiation apparatus which concerns on a comparative example, and is the figure explaining the irradiation state of light to a wire rod. It is sectional drawing of the main part of the light irradiation apparatus which concerns on embodiment, and is the figure explaining the irradiation state of light to a wire rod. It is sectional drawing of the main part of the light irradiation apparatus which concerns on another embodiment, and is the figure explaining the arrangement of a light source. It is a cross-sectional view of the main part of the light irradiation apparatus which concerns on still another Embodiment, and is a figure explaining the arrangement of a light source. It is sectional drawing of the main part of the reflection surface which concerns on still another Embodiment. It is sectional drawing of the main part of the reflection surface which concerns on still another Embodiment. It is sectional drawing of the main part of the light irradiation apparatus which concerns on still another embodiment. It is sectional drawing of the main part of the light irradiation apparatus which concerns on still another embodiment. It is sectional drawing of the main part 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 in the circumferential direction of a wire rod, and the illuminance. It is a graph which shows the relationship between the amount of eccentricity between the center of a wire rod and the center of a reflective surface, and the standard deviation in illuminance at each position in the circumferential direction of a wire rod. It is a graph which shows the relationship between the position in the circumferential direction of a wire rod, and the illuminance. It is a graph which shows the relationship between the amount of eccentricity between the center of a wire rod and the center of a reflective surface, and light efficiency. It is a graph which shows the relationship between the amount of eccentricity between the center of a wire rod and the center of a reflective surface, and light efficiency.

Hereinafter, an embodiment of the light irradiation device will be described with reference to FIGS. 1 to 10. In each drawing (the same applies to FIGS. 11 to 17), the dimensional ratio of the drawings and the actual dimensional ratio do not always match, and the dimensional ratios between the drawings do not necessarily match. Absent.

As shown in FIG. 1, the light irradiation device 1 according to the present embodiment is used in an optical fiber manufacturing device 100 that manufactures an optical fiber. Therefore, prior to explaining 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 conveying device 110 for conveying the optical fiber 200 and a coating device 120 for applying an ultraviolet curable resin to the conveyed optical fiber 200. Then, the transport device 110 conveys the transport members 111 and 112 while holding the optical fiber 200 so that the optical fiber 200 is inserted into a predetermined position inside the light irradiation device 1. The transport device 110 is on the upstream side of 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 inside at a speed of 1000 meters per minute with ultraviolet rays. As a result, the optical fiber 200 manufactured by the optical fiber manufacturing apparatus 100 is composed of, for example, a bare optical fiber made of glass fiber and a coating film cured with 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 that irradiates light toward the optical fiber (wire rod) 200, and an insertion unit 3 into which the optical fiber 200 is inserted. It has. Further, the light irradiation device 1 includes a connecting portion 4 that rotatably connects the light source unit 2 and the insertion unit 3 with the rotation shaft 4a.

The light source unit 2 includes a light source 21 that irradiates 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. Further, the light source unit 2 includes a power supply unit 24 for supplying electric power to the light source 21.

The light source 21 is formed in a long length along the extending direction (conveying direction) D1 of the optical fiber 200. The light source 21 is arranged so as 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 having 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 allows the cooling water to flow inside, the cooling body 22a, the inflow unit 22b for flowing the cooling water into the cooling body 22a, and the cooling water flowing out from the cooling body 22a. It is provided with an outflow portion 22c. The cooling main body 22a is arranged inside the housing 23, and the inflow portion 22b and the outflow portion 22c are arranged outside the housing 23.

The housing 23 includes a light-transmitting portion 23a that transmits light radiated from the light source 21 and a light-shielding portion 23b that blocks light. The light transmitting portion 23a is formed in a long length along the extending direction (conveying direction) D1 of the optical fiber 200. The light transmitting portion 23a is arranged so as to face the light source 21. As a result, the light transmitting portion 23a is arranged between the light source 21 and the optical fiber 200.

The power supply unit 24 is used in various ways to supply electric power from the outside, for example, to electrically connect the power supply connection unit 24a to which a cable or the like is connected, and the power supply connection unit 24a and the light source 21. It is provided with a terminal block 24b having the terminal of. The power supply connection portion 24a is arranged outside the housing 23, and the terminal block 24b is arranged inside the housing 23.

The insertion unit 3 has a main body 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 main body 5, and an insertion portion 6 are formed therein. Is provided with a fixing portion 7 for fixing the main body portion 5. Further, the insertion unit 3 includes a main body cooling unit 8 for cooling the main body 5.

The main body cooling unit 8 is connected to the main body 5, and the cooling water flows inside the cooling main body 8a, the inflow part 8b for flowing the cooling water into the cooling main body 8a, and the cooling water flowing out from the cooling main body 8a. It is provided with an outflow portion 8c for the purpose. The main body cooling unit 8 (cooling main body 8a) is configured to be detachable from the main body 5.

As shown in FIGS. 4 and 5, the main body 5 is formed in a long length along the extending direction (conveying 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. The concave portion 51 is provided with a reflecting surface 52 that reflects light on the inner surface formed in an arc shape. Further, the concave portion 51 is provided with one opening 53 on one side of the reflective surface 52 in the circumferential direction.

The reflecting surface 52 is formed to be long along the extending direction (conveying direction) D1 of the optical fiber 200. The reflecting surface 52 is formed of a curved surface. Specifically, the reflection surface 52 is formed in an arc shape formed of a part of a perfect circle in a cross section formed by a plane orthogonal to the longitudinal direction. The reflective surface 52 is formed to a size that allows the insertion portion 6 to be inserted inside.

The opening 53 is formed in a long length along the extending direction (conveying direction) D1 of the optical fiber 200. The opening 53 is covered with the translucent portion 23a and is arranged so as to face the light source 21. As a result, the light from the light source 21 is applied to the optical fiber 200 inside the reflecting surface 52 via the translucent portion 23a and the opening 53. Therefore, the light source 21 irradiates the optical fiber 200 with light from one side in the circumferential direction of the optical fiber 200.

The insertion portion 6 includes an insertion hole 62 that forms an insertion path 61 inside, and the insertion hole 62 is arranged inside and outside the reflection surface 52. Specifically, the insertion portion 6 is formed of a tubular body having translucency, and is arranged inside and outside the reflecting surface 52. The insertion hole 62 is formed in a circular shape in a cross section formed by a plane orthogonal to the 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 is filled with nitrogen. Then, when the resin on the surface of the optical fiber 200 is cured, volatile substances are generated. Therefore, the insertion portion 6 prevents the volatile substances from adhering to the light source unit 2 (transmissive portion 23a) and the reflecting surface 52. ing.

As shown in FIG. 5, the insertion portion 6 (insertion hole 62) is arranged so that the center 61a of the insertion path 61 is eccentric with respect to the arcuate center 52a of the reflection surface 52. Specifically, the insertion portion 6 (insertion hole 62) has a direction in which the center 61a of the insertion path 61 comes into contact with and separates from the light source 21 with respect to the arcuate center 52a of the reflection surface 52 (more specifically, the light source 21). It is arranged so as to be eccentric in the direction away from).

In this embodiment, the arrangement of the light source 21 and the reflecting surface 52 is line-symmetrical (in the third direction D3 in FIG. 5). In this way, when the arrangement of the light source 21 and the reflecting surface 52 is line-symmetrical, the direction of contact and separation from the light source 21 is the direction of the reference line having such line symmetry.

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

As shown in FIGS. 6 and 7, the main body 5 is provided with reflective end faces 54 that reflect light at both ends in the longitudinal direction. The reflection end surface 54 is arranged so as to cover a part of the gap between the insertion portion 6 and the reflection surface 52.

As shown in FIGS. 6 and 8, the fixing portion 7 includes a pair of sandwiching portions 71 and 72 that sandwich the insertion portion 6. Then, in the fixing portion 7, the pair of sandwiching portions 71 and 72 sandwich the longitudinal end portion of the insertion portion 6, so that the longitudinal end portion of the insertion portion 6 and the longitudinal end portion of the main body portion 5 are formed. Is fixed.

The configuration of the light irradiation device 1 according to the present embodiment is as described above. Next, FIG. 9 shows an example of the action and effect caused by the center of the wire rod 200 being eccentric with respect to the arcuate center 52a of the reflecting surface 52. And FIG. 10 will be referred to in the description.

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

However, the light that passes near the arcuate center 52a of the reflecting surface 52 irradiates the front side of the wire rod 200 (the surface facing the light source 21 and the upper surface side in FIGS. 9 and 10). (See the alternate long and short dash 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. As a result, in the comparative example according to FIG. 9, light cannot be uniformly irradiated over the circumferential direction of the wire rod 200.

Further, when the arc-shaped reflecting surface 52 is used, the side surface side (left surface side and right surface side in FIG. 9) of the wire rod 200 arranged at the arc-shaped center 52a of the reflecting surface 52 is not irradiated with light. This is because the light beam directed toward the arcuate center 52a of the reflecting surface 52 is geometrically perpendicular to the direct light from the light source 21 arranged on one side in the circumferential direction of the wire rod 200 and the reflecting surface. This is because the range of the direct light and the reflected light toward the arcuate center 52a is limited to the front side and the back side because only the reflected light of the incident light is used. As a result, it is difficult to irradiate the side surface side with light, and it becomes even more difficult to uniformly irradiate the wire rod 200 with light in the circumferential direction.

On the other hand, in the embodiment according to FIG. 10, the center of the wire rod 200 is eccentric with respect to the arcuate center 52a of the reflecting surface 52. In such a configuration, the light does not need to pass through the position of the wire 200 in order to illuminate the back side of the wire 200. Therefore, the back side of the wire rod 200 is irradiated with light as in the case of the front side of the wire rod 200. Further, the side surface side of the wire rod 200 is also suitably irradiated with light.

As a result, in the embodiment according to FIG. 10, light can be uniformly irradiated over the circumferential direction of the wire rod 200. By eccentricity of the center of the wire rod 200 with respect to the arcuate center 52a of the reflecting surface 52 in this way, light can be uniformly irradiated over the circumferential direction of the wire rod 200.

Next, an example of the action and effect caused by the center of the wire rod 200 being eccentric with respect to the arcuate center 52a of the reflecting surface 52 in the direction away from the light source 21 will be described.

In the configuration in which the position of the wire rod 200 is closer to the light source 21 than the position of the wire rod 200 is away from the light source 21, for example, most of the light emitted from the light source 21 is directly irradiated to the wire rod 200. As a result, the amount of light reflected by the reflecting surface 52 is reduced, so that the amount of light irradiating the back surface side of the wire rod 200 is reduced.

Further, in a configuration in which the position of the wire rod 200 is closer to the light source 21 than in a configuration in which the position of the wire rod 200 is separated from the light source 21, for example, the back surface side of the wire rod 200 is separated from the reflecting surface 52. As a result, the amount of light that illuminates the back surface side of the wire rod 200 is reduced.

As described above, in the configuration in which the position of the wire rod 200 approaches the light source 21, the back surface side of the wire rod 200 tends to be less likely to be irradiated with light than the front side of the wire rod 200. In this way, by eccentricity of the center of the wire rod 200 with respect to the arcuate center 52a of the reflection surface 52 in the direction away from the light source 21, it is possible to irradiate light more uniformly over the circumferential direction of the wire rod 200. ..

From the above, the light irradiation method according to the present embodiment is a light irradiation method in which the light irradiation device 1 irradiates the wire rod 200 with light, and the light irradiation device 1 has a concave inner surface formed in an arc shape. 52, and a light source 21 that irradiates 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 reflects the light. Inserting the wire rod 200 inside the reflecting surface 52 so as to be eccentric with respect to the arcuate center 52a of the surface 52, and irradiating light from the light source 21 toward the wire rod 200. Including.

According to such a method, the center of the wire rod 200 inserted inside the reflecting surface 52 is eccentric with respect to the arcuate center 52a of the reflecting surface 52. Then, the light from the light source 21 is irradiated toward the wire rod 200. As a result, even if light is irradiated toward the wire rod 200 from one side in the circumferential direction of the wire rod 200, the light can be uniformly irradiated over the circumferential direction of the wire rod 200.

Further, the light irradiation device 1 according to the present embodiment is arranged on a concave inner surface formed in an arc shape, from a reflecting surface 52 into which the wire rod 200 is inserted, and from one side in the circumferential direction of the wire rod 200. The insertion path 61 includes a light source 21 that irradiates light toward the wire rod 200, and an insertion portion 6 that internally forms an insertion path 61 for inserting the wire rod 200 into the reflection surface 52. The center 61a is eccentric with respect to the arcuate center 52a of the reflection surface 52.

According to such a configuration, the insertion portion 6 forms an insertion path 61 inside for inserting the wire rod 200 into the reflection surface 52. Since the center 61a of the insertion path 61 is eccentric with respect to the arcuate center 52a of the reflection surface 52, the center of the wire rod 200 inserted inside the insertion portion 6 is the arcuate center of the reflection surface 52. Eccentric with respect to 52a. As a result, even if light is irradiated toward the wire rod 200 from one side in the circumferential direction of the wire rod 200, the light can be uniformly irradiated over the circumferential direction of the wire rod 200.

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

According to such a configuration, the center 61a of the insertion path 61 is eccentric with respect to the arcuate center 52a of the reflecting surface 52 in a direction away from the light source 21. Therefore, the center of the wire rod 200 inserted inside the insertion portion 6 is eccentric with respect to the arcuate center 52a of the reflecting surface 52 in the direction away from the light source 21.

Thereby, for example, in the light radiated from the light source 21, not only the light directly radiated to the wire rod 200 but also the light reflected by the reflecting surface 52 can be secured. Further, for example, it is possible to prevent the back surface side of the wire rod 200 from being too far from the reflecting surface 52. Therefore, even if light is irradiated toward the wire rod 200 from one side in the circumferential direction of the wire rod 200, the light can be more uniformly irradiated over the circumferential direction of the wire rod 200.

Further, in the light irradiation device 1 according to the present embodiment, the insertion portion 6 includes an insertion hole 62 for forming the insertion path 61 inside, and the insertion hole 62 is inside and outside the reflection surface 52. At least one of them (specifically, inside and outside) is arranged so that the center 61a of the insertion path 61 is eccentric with respect to the arcuate center 52a of the reflection surface 52.

According to such a configuration, the insertion hole 62 forms an insertion path 61 inside, and is arranged at least one of the inside and the outside (specifically, the inside and the outside) of the reflection surface 52. The insertion hole 62 is arranged so that the center 61a of the insertion path 61 is eccentric with respect to the arcuate center 52a of the reflection surface 52. As a result, the wire rod 200 is inserted into the insertion hole 62, so that the center of the wire rod 200 is surely eccentric with respect to the arcuate center 52a of the reflecting surface 52.

Further, in the light irradiation device 1 according to the present embodiment, the reflection surface 52 is formed of a curved surface.

The light irradiation device and the light irradiation method are not limited to the configuration of the above-described embodiment, and are not limited to the above-mentioned action and effect. In addition, it goes without saying that the light irradiation device and the light irradiation method can be variously modified within a range that does not deviate from the gist of the present invention. For example, it goes without saying that one or a plurality of configurations and methods according to the following various modification examples may be arbitrarily selected and adopted for the configurations and methods according to the above-described embodiment.

In the light irradiation device 1 and the method according to the above embodiment, one light source 21 is provided. However, the light irradiation device 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. Then, for example, the plurality of light sources 21 may all have the same output, or, for example, the light source 21 may have a different output with respect to at least one other light source 21.

Here, as shown in FIGS. 11 and 12, the "light source that irradiates the wire from one side in the circumferential direction of the wire" is unidirectional D4 with respect to the reference surface S1 including the center of the wire 200. It refers to a light source 21 that irradiates light toward the wire rod 200 from the side. That is, the light irradiation device and method is a light source that irradiates the reference surface S1 with light from the other direction D5 side toward the wire rod 200 (irradiates the reference surface S1 with light from the one direction D4 side toward the wire rod 200). Of the light sources 21 to be used, the output is 25% or less of the output of the light source 21 having the largest output (excluding the “auxiliary light source”).

Further, in the light irradiation device 1 according to the above embodiment, the reflection surface 52 is formed in an arc shape formed of a part of a 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 formed of a part of an ellipse, and for example, as shown in FIG. 14, a plurality of reflecting surfaces 52 may be formed. It may be formed by arranging the planes of the above in an arc shape, that is, it may be formed in a polygonal shape.

Here, the "arc shape" in the "reflecting surface arranged on the concave inner surface formed in an arc shape" is the diameter of the inscribed circle C1 inscribed in the reflecting surface 52 and the circumscribed circle C2 inscribed in the reflecting surface 52. It means that the relationship with the 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 arcuate center 52a of the reflecting surface 52 is the center of the inscribed circle (circle C1 in FIGS. 13 and 14) of the reflecting surface 52. The reflecting surface 52 may be formed in a size that allows the optical fiber 200 to be inserted inside. Further, for example, the reflecting surface 52 may be formed not only in an arc shape which is a part of a circular shape but also in an arc shape (that is, a circular shape) which is the entire circular shape.

By the way, in a reflective curved surface such as an elliptical mirror or a parabolic mirror that does not satisfy the above equation, even if a configuration in which the center of the wire rod 200 is eccentric with respect to the focal position of the reflective curved surface is adopted, the center of the wire rod 200 is used. However, the uniformity of light irradiation over the circumferential direction of the wire rod 200 is not improved with respect to the configuration in which is located at the focal position of the reflection curved surface.

Further, in the light irradiation device 1 according to the above embodiment, the insertion hole 62 is formed in a 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 61a of the insertion path 61 is the center of the inscribed circle (circle C3 in FIG. 15) inscribed in the surface forming the insertion path 61.

Further, in the light irradiation device 1 according to the above embodiment, the insertion holes 62 are arranged inside and outside the reflection surface 52. However, the light irradiation device is not limited to such a configuration. For example, the insertion hole 62 may be arranged only inside the reflection surface 52, or, for example, the insertion hole 62 may be arranged only outside the reflection surface 52.

Further, in the light irradiation device 1 according to the above embodiment, the insertion path 61 is configured by an insertion hole 62 having a configuration different from that of the reflection surface 52. 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 reflection surface 52 constitutes at least a part of the insertion portion 6, and the center 61a of the insertion path 61 is formed. It may be formed so as to be eccentric with respect to the arcuate center 52a of the reflecting surface 52.

The insertion portion 6 according to FIG. 16 is composed of a reflecting surface 52 and a translucent portion 23a of the light source unit 2. The insertion path 61 is composed of an inner space composed of a reflecting surface 52 and a light transmitting portion 23a. The center 61a of the insertion path 61 is the center of the inscribed circle C4 inscribed in the surface forming the insertion path 61 (the surface of the reflection surface 52 and the light transmitting portion 23a in FIG. 16).

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

Further, for example, the center 61a of the insertion path 61 is in a direction orthogonal to the direction in which the light source 21 is brought into contact with the arcuate center 52a of the reflecting surface 52 (for example, the second direction D2 in FIG. 5 and the opposite direction). It may be configured to be eccentric to. However, the center 61a of the insertion path 61 may be eccentric with respect to the arcuate center 52a of the reflecting surface 52 in a direction in which the light source 21 is brought into contact with or separated from the light source 21 (for example, the third direction D3 in FIG. It is particularly preferable that the reflection surface 52 is eccentric with respect to the arcuate center 52a in a direction away from the light source 21 (for example, the direction opposite to the third direction D3 in FIG. 5).

Further, in the light irradiation device 1 and the method according to the above embodiment, the wire rod 200 is an optical fiber. However, the light irradiation device and method are not limited to such a configuration. For example, the wire rod 200 may be made of fibers. Specifically, the light irradiation device and method may be a device and method for modifying the surface of the fiber by irradiating the wire rod 200, which is a fiber, with ultraviolet light.

Further, in the light irradiation device 1 and the method according to the above embodiment, the wire rod 200 is configured to be irradiated with light while traveling inside the light irradiation device 1. However, the light irradiation device and method are not limited to such a configuration. For example, the wire rod 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 arranged so that the center 61a of the insertion path 61 is eccentric with respect to the arcuate center 52a 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 arcuate center 52a of the reflection surface 52, and the center of the wire rod 200 is the arcuate center 52a of the reflection surface 52 (insertion path 61a). The wire rod 200 may be inserted inside the reflecting surface 52 so as to be eccentric with respect to the center 61a).

Further, in the light irradiation device 1 and the 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 located at the center 52a. On the other hand, a configuration that occupies 50% (180 °) or more in the circumferential direction is more preferable. According to such a configuration, the light leaking from the reflecting surface 52 to the outside can be suppressed, and the light taken into the reflecting surface 52 can be used more effectively.

Further, 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, the light leaking from the reflecting surface 52 to the outside can be suppressed, and the light taken into the reflecting surface 52 can be used more effectively.

Further, in the light irradiation device 1 and the method, the amount of eccentricity of the center of the wire rod 200 (center 61a of the insertion path 61) with respect to the arcuate center 52a of the reflection surface 52 is larger than the radius of the wire rod 200. The structure is preferable, and more preferably, the structure is larger than the diameter of the wire rod 200. According to such a configuration, since the arcuate center 52a of the reflecting surface 52 is located outside the wire rod 200, light can be uniformly irradiated over the circumferential direction of the wire rod 200.

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

<Illuminance distribution>
Assuming that the 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 rod 200 was determined by the ray tracing method. The position of 0 ° in the circumferential direction of the wire rod 200 is the position of the end point (upper end point 200a in FIG. 17) on the side facing the light source 21, and the position of ± 180 ° in the circumferential direction is the side facing the light source 21. It is the position of the end point (lower end point 200b in FIG. 17) on the opposite side of the above.

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

FIG. 18 shows the relationship between the position of the wire rod 200 in the circumferential direction and the illuminance (absolute value) in the light irradiation device 1 under the above conditions. Graph X1 shows the illuminance of the comparative example in which the eccentricity W5 is 0 mm, and graphs X2 to X8 show the illuminance of the example in which the eccentricity W5 is 1 mm, 2 mm, 3 mm, 4 mm, 4.5 mm, 5 mm and 6 mm. Are shown respectively. The eccentricity amount W5 is eccentric in the direction in which the center of the wire rod 200 is relatively far from the light source 21 as compared with the arcuate 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 eccentricity W5 does not exist, the illuminances X2 to X5 of the example in which the eccentricity W5 exists uniformly irradiate the wire 200 in the circumferential direction. Can be done. As a result, the center of the wire rod 200 is eccentric with respect to the arcuate center 52a of the reflecting surface 52, so that light can be uniformly irradiated over the circumferential direction of the wire rod 200.

FIG. 19 shows the relationship between the eccentricity amount W5 and the standard deviation of the illuminance at each position of the wire rod 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, 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 rod 200 in the circumferential direction and the illuminance (relative value when the maximum illuminance is 100) in the light irradiation device 1 under the above conditions. Similar to FIG. 18, graph Y1 shows the illuminance of the comparative example in which the eccentricity W5 does not exist, and graphs Y2 to Y3 show the illuminance of the example in which the eccentricity W5 is 4.5 mm.

The graph Y2 is the illuminance of the embodiment in which the center of the wire rod 200 is eccentric in the direction relatively away from the light source 21 as compared with the arcuate center 52a of the reflecting surface 52. Further, the graph Y3 is the illuminance of the embodiment in which the center of the wire rod 200 is eccentric in the direction relatively closer to the light source 21 as compared with the arcuate center 52a of the reflecting surface 52.

As shown in FIG. 20, the center of the wire rod 200 is centered with respect to the illuminance Y3 of the embodiment in which the center of the wire rod 200 is eccentric in the direction relatively closer to the light source 21 as compared with the arcuate center 52a of the reflecting surface 52. The illuminance Y2 of the embodiment in which the illuminance Y2 is eccentric in the direction relatively away from the light source 21 as compared with the arcuate center 52a of the reflecting surface 52 can be further made uniform over the circumferential direction of the wire rod 200.

<Light efficiency>
Assuming that the light was uniformly irradiated from the entire surface of the light source 21, the ratio (light efficiency) of the amount of light irradiated to the wire rod 200 to the amount of light emitted from the light source 21 was determined by the ray tracing method. In addition, the event of light loss is a part other than the reflecting surface 52 and the wire 200 when the reflected light is incident on the light source 21 and attenuated when the reflected light is repeatedly reflected and attenuated by the reflecting surface 52 without being incident on the wire 200. (For example, when it is incident on the light transmitting portion 23a or the like), it is attenuated when it is reflected by the reflecting surface 52, or it is attenuated when it is transmitted through the insertion portion 6.

FIG. 21 shows the relationship between the eccentricity amount 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 rod 200 is eccentric in the direction relatively away from the light source 21 as compared with the arcuate center 52a of the reflecting surface 52, and the center of the wire rod 200 is the center. The case where the reflection surface 52 is eccentric in the direction relatively close to the light source 21 as compared with the arcuate center 52a is defined as minus (−).

As shown in FIG. 21, the light efficiency of the example in which the eccentricity W5 exists is higher than the light efficiency of the comparative example in which the eccentricity W5 does not exist (the eccentricity W5 is 0 mm). As a result, the center of the wire rod 200 is relatively eccentric as compared with the arcuate center 52a of the reflecting surface 52, so that the luminous efficiency can be improved.

Further, with respect to the embodiment in which the center of the wire rod 200 is eccentric (on the minus side) in the direction relatively closer to the light source 21 as compared with the arcuate center 52a of the reflection surface 52, the center of the wire rod 200 is the reflection surface. An embodiment (on the plus side) that is eccentric in a direction relatively away from the light source 21 as compared with the arcuate center 52a of 52 can improve the light efficiency.

FIG. 22 shows the relationship between the eccentricity amount W5 and the light efficiency in the light irradiation device 1 in which the diameter of the reflecting 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 examples in which the diameters of the reflecting surfaces 52 are 38.5 mm, 41.5 mm, 44.5 mm, and 47.5 mm, respectively. The eccentricity amount W5 is eccentric in the direction in which the center of the wire rod 200 is relatively away from the light source 21 as compared with the arcuate center 52a of the reflecting surface 52.

As shown in FIG. 22, in the example in which the eccentricity W5 exists with respect to the light efficiency of the comparative example in which the eccentricity W5 does not exist (the eccentricity W5 is 0 mm) at any of the diameters of the reflecting surfaces 52. The light efficiency is high. As a result, regardless of the diameter of the reflecting surface 52, the center of the wire rod 200 is eccentric with respect to the arcuate center 52a of the reflecting surface 52, so that the light efficiency can be improved. Further, in the light irradiation device 1 under such conditions, the light efficiency can be most improved when the eccentricity amount W5 is 5 mm regardless of the diameter of the reflecting surface 52.

1 ... light irradiation device, 2 ... light source unit, 3 ... insertion unit, 4 ... connection part, 4a ... rotating shaft, 5 ... main body part, 6 ... insertion part, 7 ... fixed part, 8 ... main body cooling part, 8a ... cooling Main 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 ... Housing, 23a ... Translucent part, 23b ... Light-shielding part, 24 ... Power supply part, 24a ... Power connection part, 24b ... Terminal block, 51 ... Concave part, 52 ... Reflective surface, 52a ... Center, 53 ... Opening, 54 ... Reflective end face, 61 ... Insert path, 61a ... Center, 62 ... Insertion hole, 71 ... Holding part, 72 ... Holding part, 100 ... Optical fiber manufacturing equipment, 110 ... Conveying device, 111 ... Conveying member, 112 ... Conveying member, 120 ... Coating device, 200 ... Wire rod (light) Fiber), 200a ... end point, 200b ... end point

Claims (12)

A reflective surface that is arranged on the concave inner surface formed in an arc shape that is at least a part of the circular shape and in which the wire rod is inserted inside.
A light source that irradiates the wire from one side in the circumferential direction toward the wire,
An insertion portion for forming an insertion path for inserting the wire rod into the inside of the reflection surface is provided.
The light source is a light emitting element mounting substrate that irradiates light from a region having a width in a cross section formed by a plane orthogonal to the extending direction of the wire rod.
The light source is arranged outside the insertion path in a cross section formed by a plane orthogonal to the extending direction of the wire rod.
A light irradiation device in which the center of the insertion path is eccentric with respect to the arcuate center of the reflection surface. A reflective surface that is placed on the concave inner surface formed in an arc shape and the wire rod is inserted inside,
A light source that irradiates the wire from one side in the circumferential direction toward the wire,
An insertion portion for forming an insertion path for inserting the wire rod into the inside of the reflection surface is provided.
In the reflective surface, the relationship between the diameter of the inscribed circle and the diameter of the circumscribed circle satisfies the following equation.
100% ≤ (diameter of circumscribed circle) / (diameter of inscribed circle) ≤ 110%
The light source is a light emitting element mounting substrate that irradiates light from a region having a width in a cross section formed by a plane orthogonal to the extending direction of the wire rod.
The light source is arranged outside the insertion path in a cross section formed by a plane orthogonal to the extending direction of the wire rod.
A light irradiation device in which the center of the insertion path is eccentric with respect to the arcuate center of the reflection surface. The light irradiation device according to claim 1 or 2, wherein the center of the insertion path is eccentric with respect to the arcuate center of the reflection surface in a direction away from the light source. The insertion portion includes an insertion hole that forms the insertion path inside.
Any one of claims 1 to 3, wherein the insertion hole is arranged at least one of the inside and the outside of the reflection surface so that the center of the insertion path is eccentric with respect to the arcuate center of the reflection surface. The light irradiation device according to item 1. The insertion portion is formed in a cylindrical shape so that the insertion path has a circular shape.
The light irradiation device according to claim 4, wherein the width dimension of the light source is larger than the inner diameter of the insertion portion. Any of claims 1 to 3, wherein the reflecting surface constitutes at least a part of the insertion portion and is formed so that the center of the insertion path is eccentric with respect to the arcuate center of the reflecting surface. The light irradiation device according to item 1. The light irradiation device according to any one of claims 1 to 6, wherein the reflecting surface is formed of a curved surface. The light irradiation device according to claim 2, wherein the reflecting surface is formed by arranging a plurality of planes in an arc shape, and any one of claims 3 to 6 quoting claim 2. The light source, in section along a plane orthogonal with respect to the extending direction of the wire, is arranged outside of the reflecting surface, the light irradiation device according to any one of claims 1 to 8. An opening formed on one side of the reflective surface in the circumferential direction and a translucent portion covering the opening are provided.
The light irradiation device according to claim 9, wherein the light source is arranged so as to irradiate the wire rod with light via the translucent portion. It is a light irradiation method in which a light irradiation device irradiates light toward a wire rod.
The light irradiation device is
A reflective surface arranged on a concave inner surface formed in an arc shape, which is at least a part of a circular shape,
A light source that irradiates the wire from one side in the circumferential direction toward the wire,
An insertion portion for forming an insertion path for inserting the wire rod into the inside of the reflection surface is provided.
The light source is a light emitting element mounting substrate that irradiates light from a region having a width in a cross section formed by a plane orthogonal to the extending direction of the wire rod.
The light source is arranged outside the insertion path in a cross section formed by a plane orthogonal to the extending direction of the wire rod.
The light irradiation method is
Inserting the wire into the inside of the reflective surface so that the center of the wire is eccentric with respect to the arcuate center of the reflective surface.
A light irradiation method including irradiating light from the light source toward the wire rod. It is a light irradiation method in which a light irradiation device irradiates light toward a wire rod.
The light irradiation device is
A reflective surface that is arranged on a concave inner surface formed in an arc shape and into which the wire rod is inserted,
A light source that irradiates the wire from one side in the circumferential direction toward the wire,
An insertion portion for forming an insertion path for inserting the wire rod into the inside of the reflection surface is provided.
In the reflective surface, the relationship between the diameter of the inscribed circle and the diameter of the circumscribed circle satisfies the following equation.
100% ≤ (diameter of circumscribed circle) / (diameter of inscribed circle) ≤ 110%
The light source is a light emitting element mounting substrate that irradiates light from a region having a width in a cross section formed by a plane orthogonal to the extending direction of the wire rod.
The light source is arranged outside the insertion path in a cross section formed by a plane orthogonal to the extending direction of the wire rod.
The light irradiation method is
Inserting the wire into the inside of the reflective surface so that the center of the wire is eccentric with respect to the arcuate center of the reflective surface.
A light irradiation method including irradiating light from the light source toward the wire rod.

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