JP2010272475A - Electrodeless ultraviolet lamp, ultraviolet irradiation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accelerate a hardening rate by irradiation with an electrodeless ultraviolet lamp having higher luminous efficiency to a photoinitiator possessing an absorption wavelength range of 350 to 380 nm. <P>SOLUTION: The electrodeless lamp 100 is constituted so that rare gas and mercury with an enough quantity retainable of an arc discharge are sealed with iron, thallium and halogen into a light-emitting space 114 of an airtight container 11 composed of an ultraviolet ray-transmittable material. When ultraviolet rays are made to emit by irradiation of microwaves to the electrodeless lamp 100 and irradiated on a curing resin composite material containing the photoinitiator having light absorption wavelength range of 350 to 380 nm, an ultraviolet ray possessing higher luminous efficiency is obtained than that emitted by a metal halide lamp with iron and halogen sealed together with mercury in it. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electrodeless ultraviolet lamp used mainly for printing-related ink drying, semiconductor-related fine exposure, liquid crystal-related adhesive curing, and the like, and an ultraviolet irradiation apparatus using the same. About.

  A conventional electrodeless ultraviolet lamp is used as a light source for irradiating an initiator, which is a UV-emitting lamp or a primer coating composition curable with UV light curable in the sunlight, with ultraviolet rays. (For example, Patent Document 1)

Special Table 2007-525540

  The technique of Patent Document 1 described above is to irradiate a photoinitiator having an absorption wavelength range in a long wavelength ultraviolet ray of 350 nm to 380 nm, but since it has a broad wavelength region between 350 nm and 380 nm, it has a single wavelength. The strength was not so high, and it was not suitable as a light source for curing a curable resin composition containing a photoinitiator.

  An object of the present invention is to enable irradiation with higher luminous efficiency when a curable resin composition containing a photoinitiator having an absorption wavelength region in a specific long wavelength ultraviolet ray is used as an object to be irradiated. An electrode ultraviolet lamp and an ultraviolet irradiation apparatus using the same are provided.

  In order to solve the above-described problems, the electrodeless ultraviolet lamp of the present invention has a hermetic container formed of an ultraviolet transmissive material sealed with a sufficient amount of rare gas, mercury and halogen to maintain arc discharge, In the electrodeless ultraviolet lamp that emits ultraviolet rays by being fed with microwaves, thallium is further sealed in the hermetic container.

  An ultraviolet irradiation device according to the present invention houses the electrodeless lamp according to claim 1 or 2 that emits ultraviolet light by feeding a microwave of a magnetron that generates a microwave, and at least the magnetron and the electrodeless lamp. And a lamp house that radiates ultraviolet rays generated from the electrode lamp to the outside.

  According to the present invention, an electrodeless lamp with a sharp and high wavelength intensity of thallium is realized with respect to a curable resin composition containing a photoinitiator having an absorption wavelength range in long-wavelength ultraviolet rays. It becomes possible to increase the curing speed of the product.

  In addition, by realizing an electrodeless lamp with a sharper and higher wavelength intensity of iron and thallium compared to a curable resin composition containing a photoinitiator having an absorption wavelength range in long wavelength ultraviolet rays, a curable resin composition It becomes possible to further accelerate the curing speed of the.

It is a block diagram for demonstrating one Embodiment regarding the electrodeless ultraviolet lamp of this invention. It is explanatory drawing for demonstrating each absorption factor with respect to the light emission wavelength of a different photoinitiator. It is explanatory drawing for demonstrating the comparison of the light distribution of a thallium enclosure electrodeless ultraviolet lamp and the conventional lamp. It is explanatory drawing for demonstrating the effect with respect to the photoinitiator of the electrodeless lamp with which the thallium of this invention was enclosed, and the conventional metal halide lamp. It is explanatory drawing for demonstrating the comparison of the light distribution of an iron and thallium enclosure electrodeless ultraviolet lamp and the conventional lamp. It is explanatory drawing for demonstrating the effect with respect to the photoinitiator of the electrodeless lamp with which iron and thallium of this invention were enclosed, and the conventional metal halide lamp. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system configuration diagram for explaining an embodiment relating to an ultraviolet irradiation device of the present invention. It is sectional drawing of the I-I 'line | wire of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

  FIGS. 1-4 is a block diagram for demonstrating one Embodiment regarding the electrodeless ultraviolet lamp of this invention.

  In FIG. 1, 100 is an electrodeless lamp. 11 of the electrodeless lamp 100 is a cylindrical single tube airtight container made of quartz glass that transmits ultraviolet light. The hermetic container 11 is provided with a taper so that the central portion 111 in the longitudinal direction is thinner than both end portions 112 and 113.

In the light emitting space 114 of the hermetic container 11, an inert gas is sealed at 30 Torr, and further mercury (Hg) and thallium iodide (TlI ₂ ) are sealed. At both ends of the hermetic container 11, support portions 115 and 116 that support the hermetic container 11 are formed integrally with the hermetic container 11, respectively.

  When an iron-based metal is further encapsulated in the electrodeless lamp 100 configured as described above, when microwaves are supplied, irradiation with ultraviolet rays by iron, which is a light-emitting metal having spectral characteristics in the ultraviolet region, becomes possible. . By irradiating the ultraviolet curable resin composition with the ultraviolet rays, the polymerizable resin of the resin composition is polymerized. The composition contains a photoinitiator for initiating the polymerization. .

  Photoinitiators include (a) 4.4′-bis (diethylamino) benzophenone, (b) 4-diethylaminoacetophenone, (c) 4-dimethylaminoacetophenone, (d) benzyl, (e) thioxanthone, (f) Benzophenone, (g) 4.4′-bis (dimethylamino) benzophenone, and the like are conceivable.

  FIG. 2 is an explanatory diagram for explaining the respective absorption rates with respect to the emission wavelengths of the photoinitiators (a) to (g). In the photoinitiators (a) to (g), photoinitiators (a) and (g) having an absorptance with respect to a high emission wavelength in a wavelength region of at least 350 nm to 380 nm are used.

  Next, Embodiment 1 of the present invention will be described with reference to FIGS. In this embodiment, the outer diameters of both end portions 112 and 113 of the airtight container 11 are 17.0 mm, the outer diameter of the central portion 111 is 12 mm, the wall thickness m is 1.0 mm, and the light emission length L is 200 mm. Inert gas is sealed at 30 torr, and mercury and thallium iodide are sealed.

  FIG. 3 compares the case of a conventional metal halide lamp in which iron is encapsulated as the light emitting metal and the case of the electrodeless lamp of the microwave power feeding system of the present invention in which thallium (Tl) is encapsulated as the light emitting metal.

  That is, an electrodeless lamp encapsulated with thallium uses ultraviolet rays for accelerating the polymerization acceleration rate of a photoinitiator having an absorption wavelength region in a long wavelength ultraviolet ray of at least 350 nm to 380 nm as compared with a metal halide lamp encapsulating iron. Many have been generated.

  Therefore, as a photoinitiator, 4.4′-bis (diethylamino) benzophenone of FIG. 2A is irradiated with ultraviolet rays of an electrodeless lamp in which the thallium of the present invention is encapsulated and an iron-based metal halide lamp. When the comparison was made, the result shown in FIG. 4 was obtained.

  That is, when the iron-based metal halide lamp is 100%, the electrodeless lamp in which thallium is enclosed is 108%. As a result, the curing rate when the ultraviolet ray of the electrodeless lamp encapsulating thallium was irradiated to the curable resin composition containing the photoinitiator 4.4′-bis (diethylamino) benzophenone was improved by 8%. It will be.

  Thus, when it is set as the electrodeless lamp with which thallium was enclosed, when it irradiates the curable resin composition containing the photoinitiator which has an absorption wavelength range between 350 nm-380 nm, it will raise luminous efficiency. As a result, the curing rate can be improved.

  Next, with reference to FIGS. 7 and 8, another embodiment for describing the electrodeless ultraviolet lamp of the present invention will be described.

  FIG. 6 shows a comparison between the case of a conventional metal halide lamp in which iron is encapsulated as a light emitting metal and the case of the electrodeless lamp of the present invention in which iron is further encapsulated in thallium as the light emitting metal.

  The electrodeless lamp in which iron and thallium are encapsulated is used to increase the rate of acceleration of polymerization of a photoinitiator having an absorption wavelength region in a long wavelength ultraviolet ray of at least 350 nm to 380 nm, as compared with iron and metal halide lamp in which iron is encapsulated. It generates ultraviolet rays.

  Therefore, as a photoinitiator, 4.4′-bis (diethylamino) benzophenone in FIG. 2A is irradiated with ultraviolet rays of an electrodeless lamp in which iron and thallium of the present invention are sealed and an iron-based metal halide lamp. When compared with the case, the result shown in FIG. 6 was obtained.

  That is, when the iron-based metal halide lamp is 100%, the electrodeless lamp in which thallium is enclosed is 125%. As a result, the curing rate when the ultraviolet light of the electrodeless lamp encapsulating thallium was irradiated to the curable resin composition containing the photoinitiator 4.4′-bis (diethylamino) benzophenone was improved by 25%. It will be.

  Thus, in the case of an electrodeless lamp in which iron and thallium are encapsulated, thallium is encapsulated when irradiated to a curable resin composition containing a photoinitiator having an absorption wavelength region between 350 nm and 380 nm. It is possible to further improve the curing rate by further increasing the luminous efficiency of the electrodeless lamp.

  7 and 8 are diagrams for explaining an embodiment of the ultraviolet irradiation apparatus according to the present invention. FIG. 7 is a system configuration diagram, and FIG.

  7 and 8, reference numeral 71 denotes a lamp house made of, for example, stainless steel having a function of shielding microwaves. The electrode house lamp 100 described with reference to FIG. It is attached to a part of the side. Reference numeral 72 denotes a magnetron that generates a microwave of 2.45 GHz, for example, and power is supplied to the magnetron 72 from a high-voltage power supply 73. Reference numeral 74 denotes a waveguide that transmits the microwave generated by the magnetron 72 from the antenna 75 and transmits it to the electrodeless lamp 100.

  An air inlet 76 is provided on the upper surface of the lamp house 71 so that air as a cooling medium blown from the blower 77 is taken into the lamp house 71. A duct (not shown) is provided between the blower 77 and the air inlet 76 so as to take in air sent from the blower 77.

  On the back side of the electrodeless lamp 100, a reflecting plate 78 for condensing or diffusing irradiated ultraviolet light is installed. Further, an RF screen 79 constituting an irradiation window is provided in a part of the lamp house 71 on the front surface of the reflection plate 78. The RF screen 79 is made of metal and has an opening, blocks microwaves, and allows ultraviolet light and air to pass through. The RF screen 79 is formed, for example, by knitting a metal wire into a mesh shape or by forming a metal plate by punching.

  In addition, the opposite surface of the RF screen 79 facing the electrodeless lamp 100 is an irradiating portion where a curable resin composition containing a photoinitiator is disposed and irradiated with ultraviolet rays.

  The magnetron 72 and the electrodeless lamp 100 blow air from the blower 77 for blowing air into the air inlet 76 and the lamp house 71 and exhaust the air from the air outlet 224 of the duct 22 for cooling. The series of air flows is a cooling mechanism. Is configured.

  Here, when the magnetron 72 is driven, air is blown from the blower 77 and taken into the lamp house 71 through the air inlet 76. The taken-in air is exhausted from the exhaust port 224 of the duct 22 through the magnetron 72, the electrodeless lamp 100, the RF screen 79, and the duct 22, as indicated by the wavy arrow in FIG.

  At this time, the electrodeless lamp 100 excited by the microwave of the magnetron 72 emits ultraviolet light and enters a photoinitiator such as (a) or (g) in FIG. The curable resin composition can be irradiated.

  In this embodiment, microwaves are fed to an electrodeless lamp in which thallium is sealed or an electrodeless lamp in which iron and thallium are sealed, and ultraviolet light having a wavelength suitable for curing a curable resin composition containing a photoinitiator is emitted. By irradiating efficiently, the curing rate of the curable resin composition can be increased, and productivity can be improved.

DESCRIPTION OF SYMBOLS 100 Electrodeless lamp 11 Airtight container 111 Center part 112,113 Both ends 114 Light emission space 115,116 Support part 71 Lamphouse 72 Magnetron 73 High voltage power supply 74 Waveguide 76 Inlet 77 Blower 78 Reflector 79 RF screen

Claims (4)

In an electrodeless ultraviolet lamp that emits ultraviolet rays by energizing microwaves by enclosing halogen together with a sufficient amount of rare gas and mercury to maintain arc discharge in an airtight container formed of an ultraviolet transmitting material,
An electrodeless ultraviolet lamp, wherein thallium is further enclosed in the hermetic container.   The electrodeless ultraviolet lamp according to claim 1, wherein iron is further enclosed in the hermetic container. The electrodeless lamp according to claim 1 or 2, wherein ultraviolet rays are emitted by feeding a microwave of a magnetron that generates a microwave;
An ultraviolet irradiation apparatus comprising: a lamp house that houses at least the magnetron and the electrodeless lamp and radiates ultraviolet rays generated from the electrodeless lamp to the outside.   4. The ultraviolet-ray irradiated resin radiated from the lamp house is an ultraviolet curable resin composition containing a photoinitiator having an absorption wavelength region in a long-wavelength ultraviolet ray of 350 nm to 380 nm. The ultraviolet irradiation device described.

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