JPH04237944A - Ultraviolet irradiating device for hardening ultraviolet-setting resin - Google Patents

Abstract

PURPOSE:To reduce the distance from a linear body, reduce the attenuation quantity, and improve the ultraviolet radiation efficiency by forming a ultraviolet lamp as a double pipe, providing a linear body passage on its inside, and sealing a ultraviolet emitting material in the pipe. CONSTITUTION:A ultraviolet radiating device has a ultraviolet lamp 3 formed as a double pipe, and a linear body passage 4 where a linear body 1 coated with ultraviolet-setting resin passes is provided on its inside. Ultraviolet emitting gas is sealed in the double pipe, and the ultraviolet rays emitted by the lamp 3 are radiated to the linear body 1. The distance between the linear body 1 and the lamp 3 is reduced, ultraviolet rays pass only the glass wall of the lamp 3 itself, the attenuation quantity is reduced, the ultraviolet irradiation efficiency to the linear body 1 can be improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet irradiation device for curing an ultraviolet curing resin (UV resin) coated on a linear body such as an optical fiber by irradiating ultraviolet rays thereon.

0002

2. Description of the Related Art UV resin is mainly used as a coating material for optical fibers. UV on linear objects such as optical fibers
To coat the resin, as shown in FIG. 4, UV resin a is applied to the optical fiber 1 at the time of drawing the optical fiber 1, and immediately after that, the optical fiber 1 is exposed to the quartz tube 2 of the ultraviolet irradiation device 20.
For example, the magnetron 21 in FIG.
The electromagnetic wave energy oscillated by the ultraviolet lamp 3 excites the gas within the ultraviolet lamp 3 to emit ultraviolet light. A part of this ultraviolet rays passes through the quartz tube 2 and irradiates the linear body 1 inside it, and a part of the ultraviolet rays is reflected by the reflective mirror 6 formed in a radial shape and irradiates the linear body 1 inside the quartz tube 2. The UV resin a is cured. In this case, if oxygen enters the quartz tube 2, the UV resin will not be completely cured and will become sticky, so normally an inert gas such as N2 is introduced into the quartz tube 2 and cured in an inert gas atmosphere. There is.

0003

[Problems to be Solved by the Invention] Conventional ultraviolet irradiation devices have had the following problems. ■． Ultraviolet lamps emit plasma through resonance of electromagnetic waves. Therefore, the tip of the waveguide becomes an electromagnetic wave resonator. For this reason, the tip of the waveguide must be closed to electromagnetic waves, but open to ultraviolet radiation. For this purpose, a wire mesh (electromagnetic shield 23) must be provided between the ultraviolet lamp 3 and the linear body 1. ■． Since the ultraviolet rays generated in the ultraviolet lamp 3 are attenuated twice by the glass wall of the ultraviolet lamp 3 itself and the glass wall of the quartz tube 2, the rate at which the ultraviolet rays are used to irradiate the linear body 1, that is, the irradiation efficiency, is reduced. not good. Therefore, more ultraviolet rays are required to irradiate a certain amount of ultraviolet rays. ■． The structure is complex, the cost is high, and maintenance is difficult.

0004

OBJECTS OF THE INVENTION An object of the present invention is to provide an ultraviolet irradiation device with high efficiency in irradiating ultraviolet rays by combining the functions of a conventional ultraviolet lamp and a conventional quartz tube in one quartz tube.

[0005]

[Means for Solving the Problems] The ultraviolet irradiation device according to claim 1 of the present invention, as shown in FIGS. 1 to 3, uses ultraviolet rays generated from an ultraviolet lamp 3 to In this ultraviolet irradiation device, the ultraviolet ray lamp 3 is made of a double pipe, and a linear body passage 4 through which the linear body 1 passes is provided inside the ultraviolet lamp 3, It is characterized by having a substance that emits ultraviolet rays sealed inside.

As shown in FIGS. 2 and 3, the ultraviolet ray irradiation device according to claim 2 of the present invention is provided with: The device is characterized by the provision of a reflective mirror 6 which allows the electromagnetic waves that excite the ultraviolet-emitting substance of the ultraviolet lamp 3 to pass therethrough, but reflects the ultraviolet rays emitted from the ultraviolet lamp 3.

[0007]

[Operation] In the ultraviolet irradiation device according to claim 1 of the present invention, the ultraviolet lamp 3 is a double pipe, inside of which is provided a linear body passage 4 through which the linear body 1 passes, and an ultraviolet light-emitting substance is sealed inside the pipe. Therefore, the distance between the linear body 1 passing through the linear body passage 4 and the ultraviolet lamp 3 becomes short, and the ultraviolet rays generated within the ultraviolet lamp 3 are attenuated only by the glass wall 5 of the ultraviolet lamp 3 itself. The efficiency of irradiating ultraviolet light onto the shaped body 1 is improved.

In the ultraviolet irradiation device according to claim 2 of the present invention, the ultraviolet rays emitted from the ultraviolet lamp 3 are reflected inward by a reflective mirror 6 provided on the inside or outside of the glass wall 5 outside the ultraviolet lamp 3. UV light is used effectively.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 to 3 showing the ultraviolet irradiation apparatus of the present invention, reference numeral 1 denotes an optical fiber whose surface is coated with UV resin.

Reference numeral 3 denotes an ultraviolet lamp having a linear body passage 4 in the center thereof through which the optical fiber 1 passes. As shown in FIG. 3, this ultraviolet lamp 3 is made of a double pipe, with a linear body passage 4 provided inside thereof through which the linear body 1 passes, and a substance (gas) that emits ultraviolet rays is sealed inside the pipe. There is.

Reference numeral 6 denotes a reflection mirror, and the reflection mirror 6 shown in FIG. 2 has a cylindrical shape and is separately provided on the outside of the glass wall 5 of the ultraviolet lamp 3. The reflection mirror 6 shown in FIG. It is provided by coating the inner surface of the glass wall 5 of the lamp 3. Incidentally, in FIG. 2, the reflection mirror 6 may be provided on the outside of the glass wall 5 of the ultraviolet lamp 3 by coating as in FIG. 3. The material of the reflective mirror 6 is such that the electromagnetic waves emitted by the magnetron 21 are transmitted therethrough and the ultraviolet rays are reflected.

0012

[Effects of the Invention] The ultraviolet irradiation device of the present invention has the following effects. ■． Since the distance between the linear body 1 passing through the linear body passage 4 and the ultraviolet lamp 3 becomes short, the efficiency of ultraviolet irradiation is improved. ■． Since it becomes easier to match the ultraviolet lamp 3 and electromagnetic waves, the shield 23 becomes unnecessary and the structure becomes simpler.

[0013]■. In the ultraviolet ray irradiation device according to the second aspect of the invention, since the reflection mirror 6 is provided, the ultraviolet rays can be used more effectively. ■．
Although the reflective mirror 6 reflects ultraviolet rays, it transmits the electromagnetic waves that excite the substance that emits ultraviolet rays in the ultraviolet lamp 3, so the electromagnetic waves projected onto the ultraviolet lamp 3 are not blocked and enter the ultraviolet lamp 3. can. ■． Because the efficiency of ultraviolet irradiation is improved, as shown in FIG. A radiation dose comparable to the level can be obtained.

[Brief explanation of the drawing]

FIG. 1A is a plan view of an ultraviolet irradiation device of the present invention, and FIG. 1B is a side view of FIG.

FIG. 2A is a plan view of another example of the ultraviolet irradiation device of the present invention, and FIG. 2B is a side view of FIG.

FIG. 3 is a longitudinal cross-sectional view showing an example of a quartz tube in the present invention.

FIG. 4 is a vertical side view of a conventional ultraviolet irradiation device.

FIG. 5A is a plan view of a conventional ultraviolet irradiation device, and FIG. 5B is a side view of FIG.

[Explanation of symbols]

a UV curing resin 1 Linear body 2 Quartz tube 3. Ultraviolet lamp 4 Linear body passage 5 Glass wall 6 Reflection mirror

Claims (2)

[Claims] [Claim 1] Linear body 1 coated with ultraviolet curing resin a
In the ultraviolet irradiation device, the ultraviolet rays emitted from an ultraviolet lamp 3 are projected to cure the ultraviolet curable resin a, the ultraviolet lamp 3 is a double pipe, and the linear body 1 passes inside thereof. An ultraviolet irradiation device for curing an ultraviolet curing resin, characterized in that a linear body passageway 4 is provided, and a substance that emits ultraviolet light is sealed inside the linear body passageway 4. 2. An ultraviolet lamp 3 is installed inside or outside the outer glass wall 5 of the ultraviolet lamp 3 made of the double pipe.
An ultraviolet irradiation device for curing an ultraviolet curable resin, characterized in that it is provided with a reflective mirror 6 that transmits electromagnetic waves that excite substances that emit ultraviolet rays, but reflects ultraviolet rays generated from the ultraviolet lamp 3.