JP2005186052A - Light irradiation apparatus. light irradiation method and method for manufacturing photoreaction product sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light irradiation apparatus in which a material to be irradiated is effectively and uniformly irradiated with light from a light source body and which is small-sized, and a method for manufacturing a photoreaction product sheet. <P>SOLUTION: The light irradiation apparatus is provided with an irradiation chamber 3 having a mirror finished inside wall 2, the light source body 5 mounted to irradiate the opposite side of the material 4 to be irradiated and a reflection plate 6 arranged to face the light source body 5 to reflect light at an optional angle to the material 4 to be irradiated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, a photoreactive composition layer applied to a sheet-like material such as a tape, a film, or a sheet is irradiated with light to photoreact the photoreactive composition layer to form a photoreaction product layer. The present invention relates to a light irradiation apparatus to be obtained and a method for producing a photoreaction product sheet using the apparatus.

  Conventionally, this type of light irradiation apparatus, for example, as shown in FIG. 6, is configured to face a light source body 51 composed of a plurality of high-pressure mercury lamps and the like that are discretely arranged at a predetermined interval. It is comprised with the to-be-irradiated object 52 which consists of the arrange | positioned photoreactive composition etc. And the to-be-irradiated object 52 is made to react with the light irradiated from the light source body 51. FIG.

However, such a conventional configuration is not preferable from the viewpoint of light efficiency because light from the light source bodies 51 passes between the light source bodies 51 and is scattered. Therefore, in order to solve these problems, light in which a reflective surface facing the object to be irradiated 52 is formed in at least one of the space formed between the light source bodies 51 and the reflection side of the object to be irradiated 52. What provided the reflection member is known (for example, refer patent document 1).
Japanese Patent Publication No. 8-26088

  However, the thing of patent document 1 arrange | positions a light source body and a to-be-irradiated object facing, and light irradiation from a light source body is directly irradiated to a to-be-irradiated object. For this reason, in order to widen the irradiation range, the distance between the light source and the object to be irradiated needs to be extremely large, and the apparatus inevitably tends to be enlarged. In addition, since the range that can be irradiated per light source body is limited, it is necessary to arrange a large number of light source bodies, resulting in high initial investment costs and running costs such as lamp replacement.

  In photopolymerization, strong illuminance is often unnecessary, and direct light from a limited distance often has too high illuminance. In such a case, since it is necessary to install a neutral density filter or the like in the light source body, the energy loss increases and the light efficiency becomes very poor. Furthermore, when the number of light source bodies increases, the temperature in the irradiation chamber rises, and when a plastic film is used for the irradiation object, the irradiation object may be deformed.

  Therefore, the present invention has been made in view of the above problems, and can efficiently irradiate the object to be irradiated with light from the light source body and can uniformly irradiate the apparatus, thereby reducing the size of the apparatus. It is an object of the present invention to provide a light irradiation apparatus capable of producing a photoreaction product sheet using the apparatus.

  A light irradiation apparatus according to the present invention for solving the above-described problems is installed in an irradiation chamber whose inner wall is mirror-finished, and in the irradiation chamber so as to irradiate light on the opposite side with respect to the irradiation object. A light source body, and a reflector disposed so as to face the light source body so as to reflect light from the light source body at an arbitrary angle with respect to the irradiated object. .

  According to such a configuration, the height of the irradiation chamber can be reduced to about half compared with the irradiation chamber of the conventional configuration, and the irradiated object can be irradiated with light with an appropriate illuminance without using a neutral density filter or the like. Can be irradiated. In addition, the reflector that reflects the light from the light source body at an arbitrary angle does not create a shadowed portion of the light source body on the irradiated object, so that the irradiated object can be irradiated with uniform light. .

  In the light irradiation apparatus according to the present invention, it is preferable that the reflector has a curvature with a radius of curvature of 10 to 100 cm.

  Since the reflector has a radius of curvature of 10 to 100 cm, preferably 40 to 90 cm, the light from the light source body can be reflected over a wide range in the irradiation chamber, so that the irradiated object is uniformly irradiated with light. Can do.

  In the light irradiation device according to the present invention, it is preferable that the reflection plate is provided so as to reflect light from the light source body at an angle of 1 to 60 °.

  By providing the reflector so as to reflect the light from the light source body at an angle of 1 to 60 °, preferably 20 to 40 °, a shadow of the light source body is not formed on the irradiated object, Uniform light can be irradiated. Here, the installation angle of the reflection plate is affected by the interval length in which the light source bodies are arranged, and can be appropriately adjusted according to the interval length of the light source bodies.

  Moreover, the light irradiation apparatus according to the present invention is preferably such that the wavelength of the light is light including an ultraviolet region.

  Since the wavelength of light is light including an ultraviolet region, an ultraviolet curable photoreactive composition can be used. Here, examples of the light source body that emits light including the ultraviolet region include low pressure mercury lamps, medium pressure mercury lamps, high pressure mercury lamps, ultrahigh pressure mercury lamps, chemical lamps, black light lamps, microwave excitation mercury lamps, metal halide lamps, and excimer lasers. Can be used alone or in combination.

  Moreover, as a light irradiation apparatus which concerns on this invention, what the said to-be-irradiated object is a sheet-like object provided with the photoreactive composition is preferable.

  Since the object to be irradiated is a sheet-like material provided with a photoreactive composition by coating or the like, it is possible to form a sheet, a tape, or a film in which a photoreaction product is formed on one side or both sides.

  In addition, the light irradiation method according to the present invention is a method in which a sheet-like material provided with a photoreactive composition is moved in an irradiation chamber whose inner surface is mirror-finished to react the photoreactive composition to generate a photoreaction. In the light irradiation method for obtaining a physical sheet, light from a light source body installed so as to irradiate light on the opposite side to the photoreactive composition is opposed to the light source body and reflected at an arbitrary angle. The light-reactive composition is reflected by the reflecting plate so that the photoreactive composition is uniformly irradiated with light.

  Moreover, the manufacturing method of the photoreactive biological sheet which concerns on this invention irradiates light uniformly to a photoreactive composition using the above-mentioned light irradiation apparatus.

  According to the present invention, it becomes possible to uniformly irradiate the irradiated object with light of moderate illuminance, and even if the distance between the light source body and the irradiated object is about half that of the conventional case, it is wide. The range can be irradiated with light, and the apparatus can be miniaturized. Moreover, since uniform light can be irradiated over a wide range, a photoreaction product sheet such as an adhesive tape having uniform characteristics can be formed.

  Hereinafter, an example of an embodiment of a light irradiation apparatus according to the present invention will be described with reference to the drawings. The light irradiation apparatus according to the present invention is not limited to the following embodiment, and can be modified within a range not departing from the gist of the present invention.

  FIG. 1 is a schematic side sectional view of a light irradiation apparatus according to this embodiment. In FIG. 1, a light irradiation apparatus 1 includes an irradiation chamber 3 in which an inner wall 2 is mirror-finished, and a light source body that is installed in the irradiation chamber 3 so as to irradiate light on the opposite side with respect to an irradiation object 4. 5 and a reflecting plate 6 disposed to face the light source body 5 so as to reflect light from the light source body 5 at an arbitrary angle with respect to the irradiation object 4 are configured as main components. .

  The irradiation chamber 3 has a mirror-finished inner wall 2 and reflects light from the light source body 5. Here, the light reflectance of the inner wall 2 is preferably 80% or more. Thereby, the light from the light source body 5 can be reflected efficiently. In addition, the irradiation chamber 3 is provided with a slit 10 serving as an entrance / exit of the irradiated object 4.

And it attaches to the side wall of this irradiation chamber 3, and the light source body 5 is provided in the longitudinal direction at predetermined intervals. The light source body 5 is provided so as to irradiate light on the opposite side with respect to the irradiated object 4. The distance l between the light sources 5 takes into account the height H of the irradiated object 4 to the upper inner wall 2 of the irradiation chamber 3, the range to be irradiated, and the illuminance of the light to be irradiated on the irradiated object 4. It can be determined as appropriate. That is, the distance 1 between the light source bodies 5 and the height H of the irradiation chamber 3 can be obtained by determining the necessary illuminance to irradiate the object 4 and calculating the illuminance. It is determined in consideration of the light irradiation range and illuminance. Here, when the illuminance necessary for the photopolymerization of the irradiated object 4 is about ² mW / cm ² , the necessary distance 1 between the light source bodies 5 is about 4 m, and the height H of the irradiation chamber 3 is about 0.8 m. Become. On the other hand, in the case of a structure that directly irradiates light to an object to be irradiated, when the illuminance of light necessary for the object to be irradiated is about ² mW / cm ² and the interval is similarly about 4 m, The height of the irradiation chamber is required to be about 1.3 m.

  FIG. 2 is a diagram for explaining the irradiation range by the light source body 5 and the positional relationship between the irradiation object 4 and the irradiation chamber 3. FIG. 2A shows a case where the light source body 5 according to the present embodiment is installed so as to be irradiated on the opposite side with respect to the irradiated object 4, and FIG. 2B shows a conventional light source body. 5 shows the case where it is installed so as to directly irradiate the irradiated object 4.

  In FIG. 2, A indicates an irradiation range of light on the irradiation object 4. As shown in FIG. 2A, the light source body 5 is installed so as to irradiate light on the opposite side with respect to the irradiated object 4, and the light from the light source body 5 is reflected above it. As shown in FIG. 2 (b), even if the irradiation chamber 3 is about half as high as the irradiation light 4 is directly irradiated with light from the conventional light source body 5, its irradiation range It can be seen that A can be made substantially the same.

  However, when the light source body 5 is installed so as to irradiate light on the opposite side with respect to the irradiated object 4 in this way, as described above, the irradiation chamber 3 is made about half the height of the conventional one, and the same Although it is possible to irradiate light over a range of areas, there arises a problem that the light source body 5 itself is also irradiated. Therefore, as shown in FIG. 1, it is preferable to provide a heat ray cut filter 7 above the light source body 5. Thereby, the temperature rise of the light source body 5 can be prevented. The light source body 5 is provided in the cold mirror 9 so as to cover the light source body 5 on the lower side so as to efficiently irradiate the opposite side of the irradiated object 4 without diffusing the light from the light source body 5. ing. The light source body 5 thus provided in the cold mirror 9 is mounted in the lamp house 8 and arranged at a predetermined position in the irradiation chamber 3. Then, by supplying and exhausting the inside of the lamp house 8, it becomes possible to reduce the influence of heat generated from the light source body 5, and to prevent thermal deformation of the irradiated object 4.

  The cold mirror 9 may be a conventional illumination device in which the light source body 5 is disposed at the focal point as in the conventional case, but preferably has a shape as shown in FIG. As shown in FIG. 3, in the cold mirror 9, a part of an elliptic curve having a first focal point 24 and a second focal point 25 with the major axis of the ellipse on the reference axis 23 is a curved surface 26. The cold mirror 9 has a mirror-finished curved surface 26 so as to reflect light from the light source body 5. Here, the light reflectance of the mirror-finished curved surface 26 is preferably 80% or more. Thereby, the light from the light source body 5 can be reflected efficiently. The cold mirror 9 reflects the ultraviolet light from the light source 5 and transmits the infrared light from the light source body 5. Thereby, it becomes possible to prevent the irradiated object from being affected by heat from the light source body 5. The light source body 5 provided in the cold mirror 9 is disposed between the first focal point 24 and the second focal point 25 on the reference axis 23 of the curved surface 26. The light source 5 has a distance L1 between the first focal point 24 and the bottom 27 of the cold mirror 9 of 1 to 40 mm, preferably 10 to 30 mm, and an inter-focal distance L2 between the first focal point 24 and the second focal point 25. The distance L3 between the light source center of the light source body 5 and the bottom part 27 of the cold mirror 9 is 50 to 200 mm, preferably 70 to 170 mm, and preferably 20 to 130 mm, preferably 40 to 100 mm. As a result, the light emitted from the light source 5 is emitted without being collected at the second focal point 25 even when reflected by the cold mirror 9. Thereby, it becomes a substantially trapezoidal shape having a region with a uniform illuminance distribution, and a region with a uniform illuminance distribution can be obtained over a wide range.

  Further, the curved surface 26 of the cold mirror 9 may have a parabolic shape. In this case, the light source body 5 is disposed between the bottom 27 of the cold mirror 9 and the focal point. The light source body 5 has a distance from the bottom 27 of the cold mirror 9 of 40 to 200 mm, preferably 70 to 150 mm, and the distance between the light source center of the light source body 5 and the bottom 7 of the cold mirror 9 is preferably 5 to 50 mm. Is preferably 5 to 40 mm. By constructing the cold mirror 9 in such a range and arranging the light source body 5, the light emitted from the light source body 5 is reflected by the cold mirror 9 and then emitted without being condensed at the focal point. Become so. As a result, it is possible to obtain a region with a substantially uniform illuminance distribution without having a peak in the illuminance distribution of light immediately below the reference axis.

As described above, the light source body 5 disposed in the cold mirror 9 is preferably one that irradiates light including an ultraviolet region. One of a microwave excitation mercury lamp, a metal halide lamp, an excimer laser, or the like can be used alone or in combination. Moreover, the light source body 5 is 0.1-300 mW / cm < ² >, Preferably it is 1-50 mW / cm < ² >. By using the one having such illuminance, it becomes possible to sufficiently promote the photopolymerization of the irradiated object 4.

  Further, as described above, the light source body 5 is provided in the cold mirror 9 and is installed in the lamp house 8, so that the light reflected on the upper inner wall 2 of the irradiation chamber 3 is placed on the irradiated object 4. Form a shadow. If a shadow is formed on the surface of the irradiation object 4, the irradiation object 4 cannot perform homogeneous photopolymerization.

  For this reason, it is preferable to arrange the reflector 6 on the upper inner wall of the irradiation chamber 3 so as to face the light source body 5 as shown in FIG. The reflector 6 can irradiate light below the lamp house 8 and does not make a shadow on the irradiated object 4. That is, the reflection plate 6 does not directly reflect light to the light source body 5, prevents the light source body 5 from rising in temperature, and reflects light below the lamp house 8 so as not to make a shadow of the lamp house 8. Also works.

  The reflecting plate 6 preferably has a curvature radius of 10 to 100 cm, preferably 40 to 90 cm. Thereby, since the light from the light source body 5 can be reflected over a wide range in the irradiation chamber 3, the light is uniformly applied to the irradiation object 4 without making a shadow of the light source body 5 on the irradiation object 4. Can be irradiated.

  Moreover, it is preferable that these reflecting plates 6 are provided so that the light from the light source body 5 may be reflected at an angle of 1 to 60 °, preferably 20 to 40 °. That is, as shown in FIG. 1, it attaches so that the attachment angle (theta) with respect to the upper inner wall 2 of the irradiation chamber 3 may be 1-60 degrees, Preferably it is 20-40 degrees. Thus, it is possible to sufficiently irradiate light below the light source body 5, so that the shadow of the light source body 5 is not created on the irradiated object 4, and the irradiated object is irradiated with uniform light. Can do.

  Here, the mounting angle of the reflecting plate 6 is, for example, as described above, when the distance l between the light source bodies 5 is 4 m, the lower part of the light source body 5 can be sufficiently irradiated with light. In order to achieve this, the mounting angle θ is about 40 °.

  As for the to-be-irradiated object 4, the photoreactive composition is apply | coated to the surface of a sheet-like material. As the sheet-like material, for example, a plastic film such as a polyester film, a nonwoven fabric, a woven fabric, paper, a metal foil, or the like is used.

  In addition, the photoreactive composition includes a photopolymerizable composition containing a monomer or a partially polymerized product thereof and a photopolymerization initiator, from a monomer that is formed by light irradiation. Here, the photopolymerization composition is polymerized by light irradiation to become a pressure-sensitive adhesive, and an acrylic, polyester, epoxy, or other photopolymerizable composition is used. Among these, an acrylic photopolymerizable composition is particularly preferably used.

  As this photopolymerizable composition, a monomer mainly composed of an alkyl acrylate monomer and a polar group-containing copolymerizable monomer are used. The alkyl acrylate monomer used in this example is a vinyl monomer mainly composed of (meth) acrylic acid alkyl ester. Specific examples thereof include methyl group, ethyl group, propyl group, butyl group, isobutyl. Group, pentyl group, isopentyl group, hexyl group, ptyl group, octyl group, isooctyl group, alkyl ester of acrylic acid or methacrylic acid having an alkyl group such as nonyl group, isononyl group, decyl group, isodecyl group, or its alkyl group Those having alkyl groups in the range of 1 to 14 carbon atoms, such as those in which a part of is substituted with a hydroxyl group, can be used with one or more of them as the main component.

  In addition, polar group-containing copolymerizable monomers include (meth) acrylic acid, itaconic acid, unsaturated acids such as 2-acrylamidopropanesulfonic acid, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl ( Hydroxyl group-containing monomers such as (meth) acrylate, caprolactone (meth) acrylate, and the like are used. Moreover, not only a monomer but dimers, such as a (meth) acrylic-acid dimer, may be used.

  The use ratio of the monomer mainly composed of an alkyl acrylate monomer and the polar group-containing copolymerizable monomer is 70 to 99% by weight for the former and 30 to 1% by weight for the latter. Preferably, the former is 80 to 96% by weight and the latter is 20 to 4% by weight. By using in such a range, the balance of adhesiveness, cohesive force, etc. can be taken well.

  Photopolymerization initiators include benzoin ethers such as benzoin methyl ether and benzoin isopropyl ether, substituted benzoin ethers such as anisole methyl ether, 2,2-diethoxyacetophenone, and 2,2-dimethoxy-2-phenylacetophenone. Substituted acetophenones such as 2-methyl-2-hydroxypropiophenone-substituted α-ketols, aromatic sulfonyl chlorides such as 2-naphthalenesulfonyl chloride, 1-phenyl-1, 1-propanedione-2 Photoactive oximes such as-(o-ethoxycarbonyl) -oxime are used. The amount of such photopolymerization initiator used is usually 0.1 per 100 parts by weight of the total of the above-mentioned monomer having the alkyl acrylate monomer as the main component and the polar group-containing copolymerizable monomer. 1 to 5 parts by weight, more preferably 0.1 to 3 parts by weight. If the amount of the photopolymerization initiator used is less than this range, the polymerization rate is slow and a large amount of monomer tends to remain, which is not industrially preferable. Conversely, if the amount is too large, the molecular weight of the polymer decreases and the cohesive strength of the adhesive decreases. It is easy to wear and favorable properties cannot be obtained in terms of adhesive properties.

  Moreover, as a crosslinking agent, a polyfunctional acrylate monomer etc. are used, for example, a trimethylol propane triacrylate, a pentaerythritol tetraacrylate, 1 * 2-ethyleneglycol diacrylate, 1 * 6-hexanediol diacrylate, 1 Bifunctional or higher alkyl acrylate monomers such as 12-dodecanediol diacrylate are used. The amount of the polyfunctional acrylate monomer used varies depending on the number of functional groups and the like, but in general, a monomer mainly composed of the above-mentioned alkyl acrylate monomer and a polar group-containing copolymerizable monomer. The total amount is 100 to 5 parts by weight, and preferably 0.01 to 5 parts by weight, more preferably 0.1 to 3 parts by weight. When a polyfunctional acrylate monomer is used in such a range, good cohesive force is maintained.

  In addition to the polyfunctional acrylate, a crosslinking agent may be used in combination depending on the use of the pressure-sensitive adhesive. As the crosslinking agent to be used in combination, for example, a commonly used crosslinking agent such as an isocyanate crosslinking agent, an epoxy crosslinking agent, or an aziridine crosslinking agent can be used. In the present invention, additives such as an adhesive adhesive can be used as necessary.

  The present invention is configured as described above, and can provide a light irradiation apparatus that can uniformly irradiate an object to be irradiated and can reduce the size of an irradiation chamber. Moreover, since it is possible to irradiate a wide range per light source, the number of light source bodies can be reduced as a whole irradiation device, and the initial investment amount and running cost can be suppressed. Further, since the number of light source bodies can be reduced, the temperature rise of the irradiated object can be suppressed, and the occurrence of thermal deformation or the like of the irradiated object can also be suppressed. In addition, the light irradiation apparatus which concerns on this invention is not limited to the above embodiment example, For example, it can also deform | transform as follows.

  For example, as shown in FIG. 4, the reflector 6 attached to the upper inner wall 2 of the irradiation chamber 3 is attached symmetrically so that the light from the light source body 5 is not reflected in only one direction but can be reflected in both directions. You can also. Accordingly, it is possible to reliably prevent a shadow of the light source body 5 from being formed on the irradiated object 4 below the light source body 5.

  Moreover, as shown in FIG. 5, the light reaction product in which the light reaction product is formed on both surfaces of the sheet-like material by providing the light source body 5 and the reflection plate 6 symmetrically up and down with respect to the irradiated object 4. Sheets can also be formed.

A PET sheet is installed as the object to be irradiated 4, and three high-pressure mercury lamps (80 W / cm, issue length 20 mm) are arranged as light sources 5 at a position 300 mm from the object 4 as shown in FIG. did. In the irradiation chamber 3, the upper inner wall 2 is formed so that the height H from the light source body 5 is 1000 mm, and the reflection plate 6 having a curvature radius of 800 mm is installed at a position facing the light source body 5. The result of simulating the light illuminance distribution in the case of the above configuration is shown in FIG. The simulation was performed by Monte Carlo ray tracing after modeling using a three-dimensional CAD. As shown in FIG. 7, it can be seen that the illuminance from the light source body with respect to the longitudinal direction (traveling direction) of the irradiation object 4 is approximately equal to about 6 mW / cm ² on average.

  And based on the simulation result by the said Example, the photoreaction product was actually produced with the light irradiation chamber 3 of the said structure. 90 parts by weight of 2-ethylhexyl acrylate as a main monomer mainly composed of an alkyl acrylate and 10 parts by weight of a polar group-containing copolymerizable monomer acrylic acid, and 2,2-dimethoxy-2 as a photopolymerization initiator -0.10 parts by weight of phenylacetophenone was put into a four-necked flask and exposed to ultraviolet rays in a nitrogen atmosphere to obtain a partially photopolymerized syrup. To 100 parts by weight of this partially polymerized syrup, 0.5 part by weight of trimethylolpropane triacrylate as a crosslinking agent was uniformly mixed to obtain a composition. When this composition was applied to a silicone-treated polyethylene terephthalate film so as to have a thickness of 50 μm and irradiated with light, a photoreaction product uniformly and uniformly polymerized could be obtained.

It is a side surface schematic sectional drawing of the light irradiation apparatus in the example of this embodiment. It is a figure for demonstrating the positional relationship of the irradiation range by a light source body, and a to-be-irradiated object and an irradiation chamber. It is the schematic which shows an example of embodiment of the cold mirror used for the light irradiation apparatus which concerns on this invention. It is a figure which shows other embodiment of the light irradiation apparatus which concerns on this invention. It is a figure which shows other embodiment of the light irradiation apparatus which concerns on this invention. It is a side surface schematic sectional drawing which shows the conventional light irradiation apparatus. It is a figure which shows the illumination intensity distribution by the simulation result shown in Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Irradiation device 2 Inner wall 3 Irradiation chamber 4 Irradiation object 5 Light source body 6 Reflector 7 Heat ray cut filter 8 Lamphouse 9 Cold mirror 10 Slit 24 First focus 25 Second focus 26 Curve 27 Curve bottom

Claims (7)

An irradiation chamber whose inner wall is mirror-finished;
A light source body installed in the irradiation chamber so as to irradiate light on the opposite side with respect to the irradiated object;
A light irradiating apparatus comprising: a reflecting plate disposed to face the light source body so as to reflect light from the light source body at an arbitrary angle with respect to the irradiated object.   The light irradiation apparatus according to claim 1, wherein the reflection plate has a curvature with a radius of curvature of 10 to 100 cm.   The light irradiation apparatus according to claim 1, wherein the reflection plate is provided so as to reflect light from the light source body at an angle of 1 to 60 °.   The light irradiation apparatus according to claim 1, wherein the wavelength of the light is light including an ultraviolet region.   The light irradiation apparatus according to claim 1, wherein the irradiated object is a sheet-like object provided with a photoreactive composition. In the light irradiation method of obtaining a photoreaction product sheet by moving a sheet-like material provided with a photoreactive composition in an irradiation chamber whose inner surface is mirror-finished and reacting the photoreactive composition,
The light from the light source body installed so as to irradiate light on the opposite side with respect to the photoreactive composition is opposed to the light source body and reflected by an arbitrary angle. A light irradiation method of reflecting and uniformly irradiating the photoreactive composition with light. The manufacturing method of the photoreaction product sheet | seat using the light irradiation apparatus of Claims 1-5.

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