JPH10274713A - Method and device for light irradiation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate photochemical reaction and to efficiently transmit heat energy by carrying high-refractive-index substrate having a higher refractive index than a photoconductor on the surface of the photoconductor and irradiating an object body with light which is guided by the photoconductor and leaks from the high-refractive-index substance. SOLUTION: On the surface of the photoconductor 1, the high-refractive-index substrate 2 which has the higher refractive index than the photoconductor 1 is carried and the object body is irradiated with the light which is guided by the photoconductor 1 and leaks from the high-refractive-index substance 2. The material of the photoconductor 1 is preferably glass which transmits ultraviolet light exciting a photocatalyst and does not react with the photocatalyst. As a more preferable glass material, low-alkali silicate glass, aluminosilicate glass, borosilicate glass, or nonalkali glass is used. Then a fiber shape, a honeycomb shape, a meshed shape, a cloth shape, a sheet shape, etc., are properly selected as the shape of the photoconductor 1 according to the purse of use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for irradiating light, and more particularly to a method and apparatus for irradiating light to a photochemical reaction system and transmitting thermal energy to the chemical reaction system.

[0002]

2. Description of the Related Art When irradiating light to a photoreaction system, most of the light is irradiated from a single direction. Also, the photoreaction begins with light absorption on the reactant surface.

[0003] In the case of a thermal reaction, heating is carried out directly with a heater or in an atmosphere. In any heating method, the thermal reaction starts from the surface near the heat source.

[0004] In the case of a combustion reaction, a pilot flame or atmospheric heating is used. Also in this case, the combustion reaction starts from a portion close to the pilot flame of the reactant, or from the surface of the reactant in the case of atmospheric heating.

[0005]

In the case of the conventional photoreaction, since the surface where the reactant is exposed is limited, a time lag of the reaction start occurs between a portion near and far from the surface. Also, the reaction progressed only on the surface portion because the surface where the reactants were exposed was limited. Furthermore, when the concentration of the reactant is high, light hardly reaches the reactant, so that it was necessary to irradiate strong light.
If one of the reactants is a solid phase, the structure must be complicated, such as arranging light sources in multiple directions so that a large amount of light is irradiated on the solid phase.

On the other hand, in the case of the conventional thermal reaction (combustion reaction), similarly to the photoreaction, the exposed surface of the reactant is limited, so that the reaction near the surface and the portion farther from the surface start the reaction. A time lag occurs. Also, the reaction progressed only on the surface portion because the surface where the reactants were exposed was limited. Further, in order to improve the heat conduction efficiency, it was necessary to always perform sufficient stirring. When a temperature gradient is formed in the reaction product, there is also a problem that a partial difference in the reaction occurs. Furthermore, in the conventional thermal reaction, since heating was performed using heat conduction or convection, it was difficult to control the temperature to be constant. It was also difficult to make many surfaces.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is based on the fact that light and heat are supplied through a light guide. It is an object of the present invention to provide a light irradiation method and a device capable of promoting a reaction and efficiently performing thermal energy transmission.

[0008]

As a means for solving the above-mentioned problems, the present invention provides a light guide having a high refractive index substance having a higher refractive index than the light guide on the surface of the light guide. The light guided by the light guide and leaked from the high-refractive-index substance is applied to the object to be irradiated. Specifically, the means described in the following claims are employed. Things.

(Claim 1) A high refractive index substance having a higher refractive index than that of the light guide is carried on the surface of the light guide, and light guided by the light guide and leaked out of the high refractive index substance. Irradiating an object to be irradiated with light.

(2) The light irradiation method according to (1), wherein the light guide is made of glass.

(Claim 3) The light guide may be any one of a fiber, a honeycomb, a mesh, a cloth, a layer, and a cotton.
The light irradiation method according to claim 1, wherein the light irradiation method is formed in one or two or more shapes.

(Claim 4) A core exposed portion lacking the clad is formed on a part or the entirety of an optical fiber having a clad provided on an outer periphery of a core, and the core exposed portion carries the high refractive index substance, A light irradiation method, comprising irradiating an object to be irradiated with light guided through a core and leaking from the high refractive index substance.

(Claim 5) A high refractive index substance having a higher refractive index than that of the light guide is carried on the surface of the light guide, and the light guided by the light guide and leaked out of the high refractive index substance. A light irradiation device configured to irradiate an object with light.

(Claim 6) A filter is formed by supporting a high refractive index substance having a higher refractive index than the light guide on the surface of the light guide, and the light guided to the light guide is A filter device that leaks from the high refractive index substance and burns the trapped matter.

(7) A high refractive index material having a higher refractive index than the light guide is carried on the surface of the light guide, and ultraviolet rays guided to the light guide leak from the high refractive index material. An ultraviolet sterilizer that sterilizes objects to be sterilized.

(8) A photocatalyst deodorizing material in which a photocatalyst is supported on a surface of a light guide as a high refractive index substance having a higher refractive index than the light guide, is provided in an atmosphere to be deodorized, and The ultraviolet light introduced into the photocatalyst is leaked from the photocatalyst to decompose and remove organic matter by a photocatalytic reaction.

(Claim 9) A photocatalytic fiber in which a photocatalyst is supported as a high-refractive index substance having a higher refractive index than the light guide on the surface of a fiber-shaped light guide having protrusions is appropriately bundled. The deodorizing unit disposed between the air-permeable members in the state is installed in the atmosphere to be deodorized, and the ultraviolet light introduced from one end or both ends of the bundled photocatalyst fibers of the deodorizing unit is exposed to the photocatalyst on the surface of each light guide. A deodorizing device configured to decompose and remove organic matter by a photocatalytic reaction by leaking out of the deodorizing device.

In each of the above-mentioned inventions, when light necessary for each reaction is irradiated, the reaction system develops a light reaction, a heat reaction, a combustion reaction, and the like in accordance with the light. As the light source wavelength, visible ultraviolet rays can be used in the light reaction, infrared rays can be mainly used in the thermal reaction, and strong visible infrared rays can be mainly used in the combustion reaction. Light from the light source may enter the light guide from one direction or two or more directions.

Examples of the material of the light guide include glass, ceramics, plastics, and crystals. One of these materials may be used alone, or two or more of them may be mixed or combined (for example, joined).

As a method for supporting the high refractive index substance, a sol-gel method, a paerosol method, a wash coat method, a vapor deposition method,
A sputtering method, a thermal decomposition method, a metal oxidation method, a double crucible method, a rod-in-tube method, or the like can be employed. Using one or more of these methods, a light guide surface of 1 nm to
Coat to a thickness of 1 mm.

The high refractive index substance can be added with an additive having an action such as photoselectivity, adhesion strength enhancement, stability enhancement or photoreaction enhancement, or used as an undercoat. Materials include Cr, Ag, Cu, Au, Pt, R
u, Pd, Rh, Sn, Si, In, Pb, As, S
Metals such as b and P, or oxides or compounds thereof can be used. In order to enhance the adhesion strength, instead of adding an additive, a Cr, I
a metal such as n, Sn, Si, P, or an oxide thereof;
Alternatively, those compounds may be provided.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is an explanatory diagram showing the configuration of various light irradiation devices.

FIG. 2 (a) shows a fiber-like structure in which a high refractive index substance 2 is supported on a surface of a light guide 1 corresponding to a core of an optical fiber and a portion corresponding to a clad (hereinafter referred to as a light irradiation fiber). FIG. 2B shows a light guide 3 formed in a honeycomb shape, on which a high-refractive-index substance 2 is carried, and FIG. 2C shows a light-irradiated fiber 4 woven in a mesh form. FIG. 2 (d) shows a light-irradiating fiber 5 in a cotton-like lump, FIG. 2 (e) shows a sheet-like light guide 6 carrying a high-refractive-index substance 2 on its surface, and a layered structure. FIG.
(F) is a cloth shape woven with the light irradiation fiber 7.

In order to form the light irradiation fiber, a known optical fiber manufacturing technique can be used, and a known glass plate manufacturing method can be used for the sheet light guide. Further, in order to form the light guide into a honeycomb shape, the raw material glass or the like may be granulated and compacted into a honeycomb shape, or a hollow light guide may be formed into a honeycomb shape.

Glass, ceramics, plastics, crystals or the like can be used as the high refractive index substance.

The light guides 1, 3, 6 or the ends of the light irradiation fibers 4, 5, 7 serve as an incident portion for receiving light. Light from a light source (not shown), for example, visible ultraviolet light, is incident on the incident portion. It is designed to be incident.

A light irradiation device is formed from the light irradiation fiber and the light source described above. Light from the light source guided to the light guide leaks out of the high-refractive-index substance, and the object to be irradiated (reactant) is irradiated with the light. At this time, as shown in FIG. 3, if the radius of curvature becomes smaller as the light irradiation fiber approaches the tip, the amount of light leakage can be made constant in the longitudinal direction.

A specific example of such a light irradiation device will be described in the following embodiments.

(First Embodiment) In the first embodiment, the light irradiation method and the apparatus of the present invention are applied to a diesel particulate filter (DPF).

The exhaust gas of a diesel engine contains solid particulates (particulates) composed of black smoke, unburned hydrocarbons, lubricating oil and the like. The particulates are generated by incomplete combustion of hydrocarbons in the fuel. However, if present in the exhaust gas, the particulates become black smoke, and it is environmentally unfavorable to directly release the particulates into the atmosphere. Therefore, in order to remove or minimize the particulates in the exhaust gas, the particulates are collected by an appropriate filter.
In the present embodiment, the particulates are collected by the above-described light irradiation fiber, and the light from the light source guided to the light guide leaks out of the high refractive index substance to irradiate the collected particulates to irradiate the collected particulates. Is to burn. Here, the term "combustion" includes thermal decomposition without generation of flame.

The diesel particulate filter of this embodiment is installed in the exhaust pipe behind the exhaust port of the diesel engine. The diesel particulate filter installed in the exhaust pipe is composed of a combination of basic units, and the basic unit is cut into a predetermined length and a plurality of light beams arranged in a blind shape as shown in FIG. Irradiation fiber 8 and multiple light irradiation fibers 8
And a halogen lamp 10 for receiving light necessary for burning the particulates collected from one end of the held light irradiation fiber 8. Since the halogen light has a relatively high temperature of, for example, about 500 ° C., the collected particulates can be burned.

As shown in FIG. 4B, two of these basic units are rotated by 90 ° or appropriately and arranged so that the light-irradiating fibers 8 are arranged so as to form an interdigital grating. . In order to increase the trapping rate by increasing the surface area, a DPF is constituted by using one or two or more basic filters.

The light guide constituting the light irradiation fiber 8 includes:
Aluminosilicate glass (glass transition point 500-800) that can withstand high temperature (100-700 ° C) exhaust gas
℃) or quartz glass (glass transition point about 1100 ℃)
Use The fiber diameter of the light irradiation fiber 8 is 1 μm or more.
It is 150 μm, preferably about 1 to 30 μm. TiO2 is used for the high refractive index material.

The above-mentioned light irradiation fiber 8 is obtained by melting an aluminosilicate glass using a high-purity raw material in a platinum crucible and forming the molten glass into a fiber shape by a pushing method. When ceramics, glass, or plastics having a higher refractive index than the aluminosilicate glass is carried on the fiber glass, the particulates can be burned by the halogen light leaked from the light irradiation fiber. Here, a TiO2 film is coated on the fiber glass by a sol-gel method. The refractive index of the TiO2 film is 2.1 to 2.6, the aluminosilicate glass is around 1.5, and the TiO2 film corresponding to the clad has a higher refractive index. Therefore, the halogen lamp 10
The light incident on the light irradiation fiber 8 leaks out of the light guide 1 and also leaks out of the high refractive index substance 2. The leaked light efficiently burns the collected particulates. At this time, if the adhesion strength enhancer is added to increase the adhesion strength to the light guide surface, the protective function of the TiO2 film can be further improved. The thickness is adjusted to be 0.5 μm. The manufactured light irradiation fiber structure is as shown in FIG.

The light to be introduced here is not limited to halogen light, and a photocatalytic action may be exerted by using UV light.

(Second Embodiment) In a second embodiment, the light irradiation method and apparatus of the present invention are applied to an ultraviolet sterilizer.

FIG. 5 is an explanatory view of an ultraviolet sterilizer according to a second embodiment of the present invention, and FIG. 6 is a sectional view taken along the line VI-VI of FIG.

In the ultraviolet sterilizer of this embodiment, a plurality of light irradiation fibers 16 are bundled by an O-ring 15 fixed inside a metal pipe 14, and one end of the plurality of light irradiation fibers 16 is connected to the metal pipe 14. And is held by a fixing bracket 13 attached to the base. Further, an ultraviolet lamp 11 and a reflecting mirror 12 are provided outside the metal pipe 14.
Is provided, and the light emitted from the ultraviolet lamp 11 and the light reflected by the reflecting mirror 12 enter the light irradiation fiber 16 from one end of the light irradiation fiber 16 held by the fixing bracket 13.

When water flows through the metal pipe 14 in such a configuration, the water is sterilized by ultraviolet light leaking from the high refractive index substance of the light irradiation fiber 14. Light irradiation fiber 1
By adjusting the interval of 6, the ultraviolet irradiation device also functions as a filter for capturing bacteria and the like, so that the bacteria can be temporarily captured and sterilized reliably.

Further, by adjusting the length of the light irradiation fiber 16, the sterilizing ability of the ultraviolet irradiation device can be adjusted.

The ultraviolet irradiation device has a very high sterilizing ability because the distance between the many light irradiation fibers 14 is narrow, so that the ultraviolet light can be reliably transmitted even in highly contaminated lake water.

(Third Embodiment) A third embodiment is one in which the light irradiation method and the apparatus of the present invention are applied to a deodorizing apparatus.

In the deodorizing apparatus of this embodiment, a photocatalyst deodorizing material in which a photocatalyst is supported on the surface of a light guide as a high refractive index material having a higher refractive index than the light guide is installed in the atmosphere to be deodorized. Ultraviolet light introduced into the light guide is leaked from the photocatalyst to decompose and remove organic matter by a photocatalytic reaction. The shape of the light guide (photocatalytic deodorant) may be appropriately selected depending on the application, such as a fiber shape, a honeycomb shape, a mesh shape, a cloth shape, and a sheet shape. Further, a projection having a projection formed on the surface of the light guide may be used.

Further, another deodorizing apparatus of the present embodiment employs a fiber-shaped light guide having a projection as the light guide. The light guide is provided on the surface of the fiber-shaped light guide having the protrusion. A photocatalyst fiber carrying a photocatalyst as a high refractive index substance having a high refractive index, a deodorizing unit disposed between air-permeable members in an appropriately bundled state is installed in an atmosphere to be deodorized, and the deodorizing unit is bundled. Ultraviolet rays introduced from one end or both ends of the photocatalyst fiber are leaked from the photocatalyst on the surface of each light guide to decompose and remove organic matter by a photocatalytic reaction.

The material of the light guide of the present embodiment is desirably glass that has a property of transmitting ultraviolet light that excites the photocatalyst and that does not react with the photocatalyst. Specifically, quartz glass or soda lime glass whose surface is coated with quartz glass may be used. However, in consideration of manufacturing cost and workability, a more preferable glass material is
A low alkali silicate glass having a SiO2 content of 30 to 70% and an alkali content of 0 to 10%,
Aluminosilicate glass, borosilicate glass, or
Alkali-free glass is preferred.

As the glass material of the light guide supporting the photocatalyst, 30 to 70% by weight of SiO 2,
l2O3 1-35%, B2O3 0-30%, MgO 0
-20%, CaO 0-40%, SrO 0-20%,
BaO is 0 to 40%, ZnO is 0 to 20%, Li2O is 0 to 10%, Na2O is 0 to 10%, and K2O is 0 to 10%.
%, 0-10% of Cs2O, Li2O + Na2O + K2O +
0-10% of Cs2O, MgO + CaO + SrO + Ba
O + ZnO + Li2O + Na2O + K2O + Cs2O
Those containing 1 to 65% are preferred.

Further, as the glass material of the light guide supporting the photocatalyst, 30 to 65% by weight of SiO 2,
l2O3 1-20%, B2O3 0-20%, MgO 0%
-20%, CaO 0-40%, SrO 0-20%,
0 to 40% of BaO, 0 to 20% of ZnO, MgO + C
aO + SrO + BaO + ZnO 1-60%, Li2O
0-10%, Na2O 0-5%, K2O 0-5%,
0-5% of Cs2O, Li2O + Na2O + K2O + Cs2
0 to 5% of O, MgO + CaO + SrO + BaO + Zn
Those containing 1 to 60% of O + Li2O + Na2O + K2O + Cs2O are preferable.

The glass material of the light guide supporting the photocatalyst is, as expressed by weight%, 49% of SiO 2, Al 2 O 3
11%, B2O3 15%, CaO 1%, BaO 2
4% or SiO2 58%, Al2
15% O3, 12% B2O3, 2% MgO, CaO
Containing 4%, 4% of SrO and 5% of BaO, or 53% of SiO2, 14% of Al2O3, B2O3
9%, MgO 2%, CaO 20%, BaO 1
% And 1% K2O are particularly preferred.

As the photocatalyst, for example, titanium oxide or its compound, iron oxide or its compound, zinc oxide or its compound, ruthenium oxide or its compound, cerium oxide or its compound, tungsten oxide or its compound , A molybdenum oxide or a compound thereof, a cadmium oxide or a compound thereof, a strontium oxide or a compound thereof, and the like. These photocatalysts may be used alone or in combination of two or more.

The photocatalyst can be supported by a sol-gel method,
Aerosol method, wash coat method, vapor deposition method, sputtering method, thermal decomposition method, metal oxidation method and the like can be adopted. Using one or more of these methods, a photocatalyst is coated and formed on the surface of the light guide to a thickness of 1 nm to 1 mm.

Further, to the photocatalyst, substances having an action such as enhancement of the catalytically active layer, enhancement of adhesion strength, enhancement of stability, enhancement of photoreaction, and enhancement of adsorptivity are added as additives, and those substances are added to the underside of the photocatalyst layer. Can be used as a coat. These materials include Cr, Ag, Cu, Au, Pt, Ru,
Pd, Rh, Sn, Si, In, Pb, As, Sb, P
Or their oxides or compounds can be used.

Next, an example in which this embodiment is specifically applied will be described with reference to FIG.

In FIG. 7, reference numeral 20 denotes a deodorizing unit. The deodorizing unit 20 includes a metal filter 21 as a gas permeable member, and a large number of photocatalytic fibers 22 sandwiched between the metal filters 21 and 21 in a bundle.
And spacers 23 for determining the distance between the metal filters 21 and 21 and preventing the bundle of the photocatalytic fibers 22 from being separated. Each photocatalytic fiber 22 is provided along the longitudinal direction of the spacer 23.

The metal filter 21 is formed by vacuum sintering a stainless steel mesh, for example, 20 mesh, 30 mesh, and 60 mesh. The metal filter 21 has air permeability and strength enough to hold the photocatalytic fiber 22 in a pressed state. The metal filters 21 and 21 are fixed to the spacers 23 and 23 with screws 24.

The photocatalytic fiber 22 has a fiber-shaped light guide having protrusions and a photocatalyst having a higher refractive index than the light guide supported on the surface of the light guide. As a method for producing a fiber-shaped light guide having projections, there is a method in which powder and particles are fixed to the fiber surface to form projections. For example, a monofilament glass fiber having only a core portion of an ordinary optical fiber (the glass composition is as described above) Is attached to a binder solution in which powder or particles of SiO2 or the like serving as projections are dissolved, and the binder solution is pulled up. Alternatively, a projection may be formed on the fiber surface itself using a mold, or powder / particles serving as a projection may be mixed with the light guide raw material, and the mixture may be formed into a fiber shape. May be formed. Next, a photocatalyst, here TiO2, is carried on the surface of the fiber-shaped light guide having projections by a sol-gel method or the like, thereby producing a photocatalytic fiber 22.

The projections of the photocatalyst fibers 22 are intended to form a filter material having a desired gap or void between the fibers simply by bundling the photocatalyst fibers 22 in substantially the same direction. The ratio of the gaps / voids or the porosity can be arbitrarily adjusted only by changing the size of the projections, the distribution density of the projections, and the like.

The shape of the projection may be any shape such as a sphere, a rod, a fiber, and an irregular shape. In addition, examples of the material of the protrusion include glass, ceramics, glass ceramics, metal, resin, and crystal. Alternatively, the protrusion may be formed by particles of a photocatalyst.

As shown in FIG. 7, an ultraviolet light source 25 for introducing ultraviolet light into the light guide of each photocatalyst fiber 22 is provided at one end of the bundled photocatalyst fibers 22. The end face of the photocatalytic fiber 22 facing the ultraviolet light source 25 is polished so that ultraviolet light is efficiently introduced. (The ends of the bundled photocatalyst fibers 22 may be fixed with an adhesive to facilitate the polishing of the end surfaces of the photocatalyst fibers 22.) The ultraviolet light source 25 is opposite to the photocatalyst fibers 22. On the side, a reflecting mirror 26 is provided to efficiently irradiate the end face of the photocatalytic fiber 22 with light from the light source 25.

The deodorizing apparatus of this embodiment is installed in an atmosphere to be deodorized, for example, in an air-cooled passage of a refrigerator or an introduction portion. The cool air in the refrigerator flows through the gaps of the photocatalytic fibers 22 bundled between the metal filters 21 and 21. On the other hand, the ultraviolet light from the ultraviolet light source 25 is applied to the end face of the photocatalyst fiber 22,
While leaking from the high-refractive-index photocatalyst coated on the light guide. At this time, the malodorous components such as ammonia and trimethylamine in the cold air come into contact with the photocatalyst, and are decomposed and removed by the photocatalytic reaction. Plant growth promoting components such as ethylene and acetaldehyde are also decomposed and removed. When the present deodorizing device is mainly used as an ethylene-free filter for long-term storage of vegetables and fruits, it is effective to provide the deodorizing device in a vegetable room of a refrigerator.

Since this deodorizing device has a filter structure in which a large number of photocatalytic fibers 22 having a small diameter and having projections are bundled, even a thin deodorizing unit 20 has a large surface area in contact with gas and has a high performance deodorizing and the like. It can be performed.

The light from the ultraviolet light source 25 is 320 to
It is near-ultraviolet light of about 450 nm, harmless to people and vegetables,
There is no problem if the light is emitted from the other end of the photocatalytic fiber 22, but a metal or the like may be coated on the other end of the photocatalytic fiber 22 so as to reflect the ultraviolet light and return the ultraviolet light. Alternatively, ultraviolet light may be irradiated from both ends of the photocatalytic fiber 22. Deodorizing unit 2
0 indicates that the photocatalyst fiber 22 is not sandwiched between the metal filters 21 and 21 as described above. It is good also as a structure which holds down with. In addition, the deodorizing device of the present embodiment,
Of course, it may be installed in an air purifier, an air conditioner, a ventilation duct of a factory or a building, etc. to achieve deodorization, sterilization, mold prevention, antifouling and the like.

The present invention is not limited to the above embodiment, but allows various modifications. For example, the light irradiation method and the device of the present invention can be applied to interiors.

[0064]

As described above, according to the present invention, a high refractive index substance having a higher refractive index than the light guide is supported on the surface of the light guide, and the high refractive index material is guided by the light guide. Since the object to be irradiated is irradiated with the light leaked from the refractive index material, the light can be efficiently irradiated.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a light irradiation fiber according to an embodiment.

FIG. 2 is an explanatory diagram showing various light irradiation devices according to the embodiment.

FIG. 3 is a diagram showing an embodiment of a light guide.

FIG. 4 is an explanatory diagram of a diesel particulate filter according to the first embodiment.

FIG. 5 is an explanatory diagram of an ultraviolet sterilizer according to a second embodiment.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a schematic perspective view of a deodorizing device according to a third embodiment.

[Explanation of symbols]

 1,3,6 Light guide 2 High refractive index substance 4,5,7 Light irradiation fiber 20 Deodorizing unit 22 Photocatalytic fiber

Claims (9)

[Claims] 1. A high refractive index material having a higher refractive index than the light guide is carried on the surface of the light guide, and light guided by the light guide and leaking from the high refractive index material is irradiated. A light irradiation method comprising irradiating an object. 2. The light irradiation method according to claim 1, wherein the light guide is made of glass. 3. The light guide according to claim 1, wherein the light guide is formed in one or more of a fiber shape, a honeycomb shape, a mesh shape, a cloth shape, a layer shape, and a cotton shape. 3. The light irradiation method according to 1 or 2. 4. A core exposed portion lacking the clad is formed on a part or the entirety of an optical fiber provided with a clad on the outer periphery of a core, and the core exposed portion carries the high refractive index substance,
A light irradiation method, comprising irradiating an object to be irradiated with light guided through a core and leaking from the high refractive index substance. 5. A high refractive index material having a higher refractive index than the light guide is carried on the surface of the light guide, and light guided by the light guide and leaking from the high refractive index material is irradiated. A light irradiation device that irradiates an object. 6. A filter comprising a high-refractive index substance having a higher refractive index than the light guide on the surface of the light guide, wherein the light guided to the light guide is high refractive index. A filter device that leaks from the substance and burns the trapped material. 7. A high refractive index material having a higher refractive index than the light guide is carried on the surface of the light guide, and ultraviolet light guided to the light guide leaks out of the high refractive index material and is covered. An ultraviolet sterilizer that sterilizes germs. 8. A photocatalyst deodorizing material in which a photocatalyst is supported as a high-refractive index substance having a higher refractive index than the light guide on the surface of the light guide is set in an atmosphere to be deodorized and introduced into the light guide. A deodorizing apparatus characterized in that ultraviolet rays are leaked from the photocatalyst to decompose and remove organic substances by a photocatalytic reaction. 9. A photocatalytic fiber in which a photocatalyst carrying a photocatalyst as a high-refractive index substance having a higher refractive index than the light guide on the surface of a fibrous light guide having protrusions is ventilated in a state of being appropriately bundled. The deodorizing unit disposed between the conductive members is placed in the atmosphere to be deodorized, and ultraviolet light introduced from one end or both ends of the bundled photocatalytic fibers of the deodorizing unit leaks out of the photocatalyst on the surface of each light guide. A deodorizing apparatus characterized in that organic substances are decomposed and removed by a photocatalytic reaction.