JP6681601B2 - Optical member, lighting cover and lighting fixture - Google Patents

Description

  The present invention relates to an optical member, a lighting cover, and a lighting fixture. More specifically, the present invention relates to an optical member having excellent light transmittance and light diffusivity, and a lighting cover and a lighting fixture using the optical member.

  The lighting fixture generally includes a lighting cover that covers the light source unit. This lighting cover is usually formed by using an optical member having a light transmitting property and a light diffusing property. By using the illumination cover having such a light transmitting property and a light diffusing property, the light emitted from the light source can be diffused over the entire light transmitting surface of the illumination cover. As a result, the amount of light transmission per unit area over the entire light-transmitting surface can be made uniform, and uneven brightness can be suppressed on the light-transmitting surface. Further, by making the light transmission amount per unit area uniform, the image of the light source can be hidden and the quality of the lighting fixture can be improved.

  Generally, an optical member having a light transmitting property and a light diffusing property is manufactured by molding a resin sheet containing a white pigment. As this white pigment, white inorganic pigments such as silicon oxide, barium sulfate, calcium carbonate, titanium oxide, mica, magnesium oxide, talc, aluminum hydroxide and aluminum oxide are used. Then, by increasing the addition amount of the white pigment, excellent light diffusivity can be imparted to the optical member. However, although these pigments have the effect of diffusing light, there is a problem in that the light transmittance decreases in proportion to the amount added. Therefore, when an optical member having an excellent light diffusing property is obtained, there is a problem that the light transmitting property is lowered. In addition, since the inorganic particles used as the white pigment deteriorate the surface of the optical member, there is a possibility that chalking may occur on the surface of the optical member.

  Therefore, for example, in Patent Document 1, it is proposed to use a light diffusing coating composition containing an acrylic resin, a fluororesin, and light diffusing particles as a light diffusing member. The light diffusing coating composition of Patent Document 1 contains 0.3 to 20 parts by mass of a fluororesin with respect to 100 parts by mass of an acrylic resin, and 100 parts by mass of an acrylic resin contains 0. It is contained in an amount of 3 to 20 parts by mass.

JP2012-208424A

  However, in a light emitting diode (LED) lighting fixture, which has recently been drawing attention from the viewpoint of energy saving, it is necessary to efficiently extract light with low power consumption, and therefore an optical member having higher light transmittance is desired. On the other hand, since the LED light source has a strong directivity, it is also necessary to impart light diffusing property to the optical member to make it difficult to recognize that the light source of the LED illumination is a point light source.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an optical member having excellent light transmissivity and light diffusivity, and a lighting cover and a lighting fixture using the same.

  In order to solve the above problems, the optical member according to the first aspect of the present invention includes a translucent resin base material and a light diffusion layer provided on the surface of the translucent resin base material. The light diffusion layer contains a translucent resin having a refractive index of 1.49 or less, and inorganic particle-encapsulated silicone particles in which a plurality of inorganic particles are encapsulated in silicone.

  In order to solve the above-mentioned subject, the lighting cover concerning the 2nd mode of the present invention uses the optical member in the 1st mode.

  A lighting fixture according to a third aspect of the present invention includes a light source section and the lighting cover according to the second aspect that covers the light source section.

  According to the present invention, it is possible to provide an optical member having excellent light transmittance and light diffusivity, and a lighting cover and a lighting fixture using the optical member.

It is sectional drawing which shows an example of the optical member which concerns on this embodiment. It is a schematic diagram showing a behavior of light on a surface of a light diffusion layer of the present embodiment. It is the schematic which shows the behavior of the light in the inorganic particle inclusion silicone particle surface of this embodiment. It is sectional drawing which shows an example of the lighting cover and lighting fixture which concern on this embodiment.

  Hereinafter, the optical member, the lighting cover using the optical member, and the lighting fixture according to the present embodiment will be described in detail.

[Optical members]
FIG. 1 shows an example of the optical member according to the present embodiment. The optical member 11 according to the present embodiment includes a translucent resin base material 12 and a light diffusion layer 17 provided on the surface of the translucent resin base material 12. The light diffusion layer 17 contains a transparent resin 13 having a refractive index of 1.49 or less, and inorganic particle-encapsulating silicone particles 16 in which a plurality of inorganic particles 15 are encapsulated in silicone 14.

  The optical member 11 according to this embodiment includes a translucent resin base material 12 and a light diffusion layer 17. The light diffusion layer 17 is provided on the surface of the translucent resin base material 12. Specifically, as will be described later, for example, when the optical member 11 is used as the lighting fixture 100, the light diffusing layer 17 is provided so that the light diffusing layer 17 is on the light source side with respect to the transparent resin base material 12. It can be provided on the surface of the transparent resin substrate 12.

  The translucent resin base material 12 is not particularly limited as long as it is a resin having a light transmissive property, but one having a total light transmittance of 90% or more is preferable. The total light transmittance is, for example, using a haze meter (NDH2000 manufactured by Nippon Denshoku Industries Co., Ltd.) and the like, Japanese Industrial Standard JIS K7361-1 (Plastic-Test method for total light transmittance of transparent material-first). Part: single beam method).

  As the transparent resin base material 12, for example, a material formed of at least one selected from the group consisting of acrylic resin, polyester resin, polycarbonate resin and styrene resin can be used. Among them, acrylic resin and polycarbonate resin have high light transmittance. Therefore, the translucent resin base material 12 is preferably formed of at least one of an acrylic resin and a polycarbonate resin.

  The acrylic resin is a resin obtained by polymerizing a monomer containing at least one of acrylate and methacrylate. Examples of the acrylate include a group consisting of methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, isobornyl acrylate, glycidyl acrylate, benzyl acrylate, stearyl acrylate, lauryl acrylate, and 2-hydroxy-3-phenoxypropyl acrylate. At least one selected from the above can be given. As the methacrylate, for example, a group consisting of methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, isobornyl methacrylate, glycidyl methacrylate, benzyl methacrylate, stearyl methacrylate, lauryl methacrylate, and 2-hydroxy-3-phenoxypropyl methacrylate. At least one selected from the above can be given.

  The acrylic resin may be a copolymer of a monomer containing at least one of acrylate and methacrylate and a monomer having a carbon-carbon double bond. Examples of the monomer having a carbon-carbon double bond include at least one selected from the group consisting of a styrene-based monomer, an olefin-based monomer, and a vinyl-based monomer. Further, examples of the styrene-based monomer include styrene and the like. Examples of the olefin-based monomer include ethylene and propylene. Examples of vinyl-based monomers include vinyl chloride and vinylidene chloride. The above monomer components may be used alone or in combination of two or more.

  Polycarbonate resin is a polymer having a carbonate bond in the main chain. As the polycarbonate resin, a polymer obtained by reacting bisphenol and phosgene or bisphenol and diphenyl carbonate can be used.

  The translucent resin substrate 12 may use either a thermoplastic resin or a thermosetting resin. When the optical member 11 according to the present embodiment is processed after being processed, the translucent resin base material 12 is preferably a thermoplastic resin because it can be stretch-molded according to a predetermined shape.

  The thickness of the translucent resin base material 12 is not particularly limited, but is preferably 0.1 mm to 3 mm, for example. Considering moldability and strength, the thickness of the translucent resin base material 12 is more preferably 1 mm to 2 mm. As the translucent resin base material 12, a material obtained by a sheet molding method such as a glass casting manufacturing method, a continuous casting manufacturing method or an extrusion manufacturing method can be used.

  The light diffusion layer 17 contains the translucent resin 13 having a refractive index of 1.49 or less, and the inorganic particle-containing silicone particles 16. That is, both the light-transmitting resin 13 and the silicone 14 constituting the inorganic particle-containing silicone particles 16 have a low refractive index. Therefore, the difference in refractive index between the air layer and the light diffusion layer 17 becomes small. As a result, as shown by the arrow in FIG. 2, the amount of Fresnel-reflected light F1 decreases and the amount of refracted light R1 increases, so that the light transmittance of the light diffusion layer 17 increases. Further, the refracted light R1 that has entered the light diffusion layer 17 is diffused by the inorganic particle-containing silicone particles 16 as described later. Therefore, the optical member 11 in this embodiment is excellent in light transmittance and light diffusion. When the inorganic particles are used instead of the silicone particles 16 containing the inorganic particles, the refractive index of the inorganic particles is high, and the difference in the refractive index from a general translucent resin becomes too large. Therefore, although such a light diffusing layer has a high light diffusing property, it has a low light transmitting property. In the case of using simple inorganic particles instead of the inorganic particle-encapsulated silicone particles 16, it is difficult to stably disperse the inorganic particles because the specific gravity of the inorganic particles is large, and unevenness easily occurs in the light diffusion layer. I will end up. On the other hand, when the mere silicone particles are used instead of the inorganic particle-containing silicone particles 16, sufficient light diffusivity cannot be obtained unless a light-transmitting resin having a higher refractive index than the silicone particles is used. In order to achieve sufficient light transmissivity and light diffusivity, it is preferable that the difference in refractive index between the resin and the particles is 0.1 or more, but when silicone particles having a refractive index of 1.42 are used, To make the difference in refractive index 0.1, a translucent resin having a refractive index of 1.52 is used. However, when such a translucent resin is used, the amount of light that Fresnel-reflects on the surface of the light diffusion layer increases, and the light transmissivity decreases. Therefore, in the present embodiment, the light diffusion layer 17 containing the translucent resin 13 having a refractive index of 1.49 or less and the inorganic particle-containing silicone particles 16 is used.

  The content of the inorganic particle-encapsulating silicone particles 16 with respect to the translucent resin 13 is not particularly limited, but the content of the inorganic particle-encapsulating silicone particles 16 in the light diffusion layer 17 is 100 parts by mass of the translucent resin 13. It is preferably 66 to 150 parts by mass. When the content of the inorganic particle-encapsulated silicone particles 16 is 66 parts by mass or more, the light diffusion effect due to the difference in the refractive index between the light-transmissive resin 13 and the inorganic particle-encapsulated silicone particles 16 is improved, and therefore the light diffusion property is excellent. The optical member 11 can be obtained. When the content of the translucent resin 13 is 66 parts by mass or more, the inorganic particle-containing silicone particles 16 are likely to be exposed on the surface of the light diffusion layer 17. The exposed inorganic particle-containing silicone particles 16 form a hemispherical lens-shaped convex portion as shown in FIG. 3 on the surface of the light diffusion layer 17. Due to this convex portion, not only the refracted light R2 directly entering the light diffusion layer 17 from the air layer but also the light F2 Fresnel-reflected at the interface between the gas layer and the light diffusion layer 17 are adjacent to each other as the refracted light R3. Since the light enters into, the light capturing effect is improved. That is, since the effect of taking in light is improved, the light transmittance is improved. When the content of the inorganic particle-encapsulating silicone particles 16 is 150 parts by mass or less, choking can be suppressed and the optical member 11 having an excellent appearance can be obtained. The content of the inorganic particle-encapsulating silicone particles 16 is more preferably 80 to 150 parts by mass with respect to 100 parts by mass of the translucent resin 13. This is because it is possible to obtain the optical member 11 having excellent light transmissivity and light diffusibility by setting the range as described above.

  The thickness of the light diffusion layer 17 is not particularly limited, but is preferably 5 μm or more and 20 μm or less. When the thickness of the light diffusion layer 17 is 5 μm or more, the light diffusion layer 17 can exert a higher light diffusion effect. Further, when the thickness of the light diffusion layer 17 is 20 μm or less, a convex portion derived from the inorganic particle-encapsulating silicone particles 16 is likely to be formed on the surface of the light diffusion layer 17. The convex portion improves the light-trapping effect of the light diffusion layer 17 as described above, and thus improves the light transmittance of the optical member 11. Further, the thickness of the light diffusion layer 17 is more preferably 7 μm or more and 15 μm or less. When the thickness of the light diffusion layer 17 is within such a range, it is possible to obtain the optical member 11 having higher light transmittance and light diffusion property. From the viewpoint of forming a convex portion on the surface of the light diffusion layer 17, the thickness of the light diffusion layer 17 is preferably adjusted in consideration of the average particle diameter of the inorganic particle-encapsulating silicone particles 16.

  The light diffusion layer 17 can be formed by, for example, applying a coating composition containing the translucent resin 13 and the inorganic particle-encapsulating silicone particles 16 to the translucent resin base material 12. The method for applying the coating composition is not particularly limited, but spray coating method, dip coating method, flow coating method, spin coating method, roll coating method, brush coating, sponge coating, etc. are preferably used. can do. When the coating composition contains an organic solvent, the light diffusion layer 17 can be formed on the surface of the translucent resin base material 12 by removing the organic solvent by heating or the like.

  The translucent resin 13 is not particularly limited as long as it is a resin having a light transmissive property, but a resin having a total light transmittance of 90% or more is preferable. The total light transmittance can be measured according to JIS K7361-1 using, for example, a haze meter.

  The translucent resin 13 may use either a thermoplastic resin or a thermosetting resin. In addition, when the optical member 11 according to the present embodiment is processed after being obtained, the translucent resin 13 is preferably a thermoplastic resin because it can be stretch-molded according to a predetermined shape.

  As the translucent resin 13, for example, a resin formed of at least one selected from the group consisting of fluororesin, acrylic resin, polyester resin, polycarbonate resin and styrene resin can be used. Among these, the fluororesin has a high light transmittance and a low refractive index. Therefore, the translucent resin 13 preferably contains a fluororesin.

  The fluororesin can be a resin obtained by polymerizing a monomer containing at least fluorine. Examples of the fluorine-containing monomer include at least one selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene, vinylidene fluoride, vinyl fluoride, fluorovinyl ether and hexafluoropropylene.

  The fluororesin may be a copolymer of a monomer containing fluorine and a monomer having a carbon-carbon double bond. Examples of the monomer having a carbon-carbon double bond include at least one selected from the group consisting of styrene-based monomers, olefin-based monomers, vinyl-based monomers, and acrylic-based monomers. Examples of the styrene-based monomer include styrene and the like. Examples of the olefin-based monomer include ethylene and propylene. Examples of vinyl-based monomers include vinyl chloride and vinylidene chloride. Examples of the acrylic monomer include acrylate and methacrylate. The above monomer components may be used alone or in combination of two or more.

  Specific examples of the fluorine resin include, for example, polytetrafluoroethylene (PTFE) resin, polychlorotrifluoroethylene (PCTFE) resin, polyvinylidene fluoride (PVDF) resin, polyvinyl fluoride (PVF) resin. Resin, tetrafluoroethylene / perfluoroalkyl vinyl ether (PFA) copolymer, tetrafluoroethylene / hexafluoropropylene (FEP) copolymer, ethylene / tetrafluoroethylene (ETFE) copolymer and ethylene / chlorotri At least one selected from the group consisting of fluoroethylene (ECTFE) copolymers can be mentioned. Among these, it is preferable to use a polytetrafluoroethylene (PTFE) resin as the fluororesin. Since the polytetrafluoroethylene (PTFE) -based resin has the lowest refractive index among the fluororesins, it is possible to suppress Fresnel reflection on the surface of the light diffusion layer 17 and obtain the optical member 11 having excellent light transmittance. The polytetrafluoroethylene (PTFE) resin may be polytetrafluoroethylene (PTFE) which is a homopolymer of tetrafluoroethylene monomer. Moreover, the polytetrafluoroethylene-based resin may be a copolymer with a polytetrafluoroethylene monomer containing a monomer other than the tetrafluoroethylene monomer up to about 30 mol%. The polytetrafluoroethylene (PTFE) -based resin may be an unmodified polytetrafluoroethylene-based resin or a modified polytetrafluoroethylene-based resin.

  The refractive index of the translucent resin 13 is not particularly limited as long as it is 1.49 or less. By setting the refractive index of the translucent resin 13 to 1.49 or less, Fresnel reflection generated on the surface of the light diffusion layer 17 can be suppressed, and the optical member 11 having high light transmissivity can be obtained. The refractive index of the translucent resin 13 is not particularly limited, but it is preferably 1.32 or more and 1.47 or less, and more preferably 1.32 or more and 1.44 or less. When the refractive index of the translucent resin 13 is in such a range, Fresnel reflection of the light diffusion layer 17 can be suppressed and the light transmittance can be increased. The refractive index is a value at NaD line (589 nm) measured by an Abbe refractometer.

  The inorganic particle-encapsulating silicone particles 16 are not particularly limited as long as the plurality of inorganic particles 15 are encapsulated in the silicone 14. Since the silicone 14 encloses a plurality of inorganic particles 15, the light entering the inorganic particle-encapsulating silicone particles 16 is diffused due to the difference in the refractive index between the silicone 14 and the inorganic particles 15, so that the optical member 11 having an excellent light diffusing property is obtained. Can be obtained. In addition, since the plurality of inorganic particles 15 are encapsulated by the silicone 14, the difference in refractive index between the air layer and the light diffusion layer 17 is reduced, and the light transmittance of the optical member 11 can be improved.

  Although not particularly limited, the average particle diameter (D50) of the inorganic particle-encapsulated silicone particles 16 is preferably 1 μm or more and 20 μm or less. When the average particle size of the inorganic particle-encapsulated silicone particles 16 is 1 μm or more, light easily collides with the inorganic particle-encapsulated silicone particles 16, and thus the light diffusivity can be improved. In addition, when the average particle diameter of the inorganic particle-encapsulated silicone particles 16 is 1 μm or more, a sufficient proportion of convex portions can be formed on the surface of the light diffusion layer 17. The convex portion improves the light-trapping effect of the light diffusion layer 17 as described above, and thus improves the light transmittance of the optical member 11. Further, when the average particle diameter of the inorganic particle-encapsulated silicone particles 16 is 20 μm or less, the dispersibility of the inorganic particle-encapsulated silicone particles 16 in the light diffusion layer 17 is improved, and thus the optical transparency of the optical member 11 is increased. can do. The average particle diameter of the inorganic particle-encapsulated silicone particles 16 is more preferably 2 μm or more. In such a range, the light transmissivity and the light diffusivity of the optical member 11 are further enhanced. The average particle size of the inorganic particle-encapsulated silicone particles 16 is more preferably 10 μm or less, and further preferably 4 μm or less. In such a range, the optical transparency of the optical member 11 becomes higher. The average particle size (D50) of the inorganic particle-encapsulated silicone particles 16 can be determined by a laser diffraction / scattering method using a laser diffraction type particle size distribution measuring device.

  Silicone 14 is a polymer having a main skeleton with a siloxane bond. The silicone 14 can be produced using, for example, an organohalosilane or an organoalkoxysilane as a raw material. Examples of the organohalosilane include at least one selected from the group consisting of methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, ethyltrichlorosilane, diethyldichlorosilane, and triethylchlorosilane. Examples of the organoalkoxysilane include at least one selected from the group consisting of organomonoalkoxysilane, organodialkoxysilane, and organotrialkoxysilane.

  The silicone 14 is solid at room temperature and is not particularly limited as long as it is a resin having a light transmitting property, but a resin having a total light transmittance of 90% or more is preferable. The total light transmittance can be measured according to JIS K7361-1 using, for example, a haze meter.

  The refractive index of the silicone 14 is not particularly limited, but it is preferably 1.40 or more and 1.43 or less. By setting the lower limit of the refractive index of the silicone 14 in the above range, the difference in refractive index at the interface between the air layer and the light diffusion layer 17 can be reduced, and the optical member 11 having excellent light transmittance can be obtained. Further, by setting the upper limit of the refractive index of the silicone 14 in the above range, a difference in refractive index occurs at the interface with the transparent resin 13, so that the optical member 11 having excellent light diffusivity can be obtained. The refractive index is a value at NaD line (589 nm) measured by an Abbe refractometer.

  The inorganic particles 15 are not particularly limited, but white inorganic particles can be used. The inorganic particles 15 are, for example, selected from the group consisting of silicon dioxide, aluminum oxide, titanium dioxide, zirconium oxide, zinc oxide, calcium carbonate, barium sulfate, kaolin, calcium sulfate, mica, magnesium oxide, talc, aluminum hydroxide and the like. At least one kind is included. Above all, aluminum oxide and titanium dioxide have high supply stability and are inexpensive. Therefore, the inorganic particles 15 preferably contain at least one of aluminum oxide and titanium oxide.

  The inorganic particle 15 is not particularly limited as long as it is a resin having light transmittance, but it is preferable that the total light transmittance is 90% or more. The total light transmittance can be measured according to JIS K7361-1 using, for example, a haze meter.

  The average particle diameter (D50) of the inorganic particles 15 is not particularly limited, but is preferably 0.01 μm or more and 2 μm or less. When the average particle diameter of the inorganic particles 15 is within the above range, the plurality of inorganic particles 15 are encapsulated in the silicone 14, and the light diffusion effect of the inorganic particle-encapsulated silicone particles 16 can be improved. The average particle diameter (D50) of the inorganic particles 15 is more preferably 0.2 μm or more and 0.7 μm or less. Within such a range, a plurality of inorganic particles 15 can be encapsulated in the inorganic particle-encapsulated silicone particles 16, so that the light diffusion effect of the inorganic particle-encapsulated silicone particles 16 can be improved. The average particle diameter (D50) of the inorganic particles 15 can be determined by a laser diffraction / scattering method using a laser diffraction type particle size distribution measuring device.

  Although not particularly limited, the refractive index of the inorganic particles 15 is preferably 1.7 to 2.5. By setting the refractive index of the inorganic particles 15 in the above range, a difference in refractive index at the interface between the silicone 14 and the inorganic particles 15 is generated, and the optical member 11 having excellent light diffusivity can be obtained. The refractive index is a value at NaD line (589 nm) measured by an Abbe refractometer.

  Thus, the optical member 11 according to the present embodiment includes the translucent resin base material 12 and the light diffusion layer 17 provided on the surface of the translucent resin base material 12. The light diffusion layer 17 contains a transparent resin 13 having a refractive index of 1.49 or less, and inorganic particle-encapsulating silicone particles 16 in which a plurality of inorganic particles 15 are encapsulated in silicone 14. Therefore, the optical member 11 having high light transmittance and light diffusivity can be obtained.

[Lighting cover]
Next, the lighting cover 40 of this embodiment will be described. The illumination cover 40 of this embodiment uses the optical member 11. That is, the lighting cover 40 of this embodiment includes the optical member 11.

  The shape of the lighting cover 40 is not particularly limited, but it is preferably mounted so as to cover the lamp serving as the light source unit 30, for example. At this time, it may be mounted so as to cover the entire light emitting portion of the lamp, or may be mounted so as to cover part of the light emitting portion of the lamp. The lighting cover 40 may have a flat plate shape, but it can also be molded by pressing and stretching it so as to cover the lamp.

  Such a lighting cover 40 can be used for various lighting fixtures. For example, it can be suitably used as a ceiling light, a pendant type light, a sink lamp, a bathroom lamp, a chandelier, a stand, a bracket, a cover of a paper lamp, and the like. Also, for garage lights, eaves lights, gatepost lights, porch lights, garden lights, entrance lights, foot lights, stair lights, guide lights, crime prevention lights, down lights, base lights, illuminated signs, sign lights, etc. It can be preferably used. Further, it can be suitably used as a cover for a vehicle lighting device such as an automobile and a motorcycle. In particular, as will be described later, it can be suitably used for a ceiling light or the like having a structure in which the lighting cover 40 is sandwiched by the instrument body 20.

  As described above, the illumination cover 40 according to the present embodiment uses the optical member 11. Therefore, it is possible to obtain the illumination cover 40 having high light transmittance and light diffusion.

[lighting equipment]
Next, the lighting fixture 100 of this embodiment will be described. The lighting fixture 100 according to the present embodiment includes a light source unit 30 and a lighting cover 40 that covers the light source unit 30. The lighting fixture 100 can also include a fixture main body 20 having an opening 21, a light source unit 30 provided in the fixture main body 20, and a lighting cover 40 that covers the opening 21.

  The lighting fixture 100 according to the present embodiment may include a fixture body 20, a light source unit 30, and a lighting cover 40. FIG. 4 shows an example of the lighting fixture 100. The lighting fixture 100 is a circular ceiling type light. In FIG. 4, the circular ceiling type light is described as an example, but the lighting fixture 100 may be a polygonal ceiling type light.

  The instrument body 20 includes, for example, a base portion 22, an engaged portion 23, and a support portion 24. The base portion 22 can be installed on an installation surface such as the ceiling 50 depending on the application. The engaged portion 23 engages with the engaging portion 41 of the lighting cover 40. In the form of FIG. 4, the engaged portion 23 is formed so as to project toward the outside of the instrument body. The support portion 24 supports the lighting cover 40 from the outside so that the lighting cover 40 is not displaced or rattled. The support portion 24 is formed so as to project downward at a position closer to the outside of the instrument body 20 than the engaged portion 23. The engaged portion 23 and the support portion 24 may be provided over the entire circumference of the instrument body 20 or may be provided in a part thereof. The instrument body 20 can be installed on the ceiling 50 as shown in FIG. 4, or can be installed in an installation place according to the application, such as the above-described lamp.

  The instrument body 20 can have an opening 21. The shape and size of the opening 21 are not particularly limited, and the opening 21 can be covered with the lighting cover 40. The opening 21 can be provided on the opposite side of the installation surface of the base 22 as shown in FIG. The opening 21 may be formed so as to be surrounded by the support 24, as shown in FIG. 4.

  The light source unit 30 can be provided in the instrument body 20. The light source unit 30 may be provided inside the opening 21 of the instrument body 20. The light source used for the light source unit 30 is not particularly limited to a point light source, a line light source, a surface light source, or the like. The light source used for the light source unit 30 is not particularly limited, but a light emitting diode (LED) light source, a fluorescent lamp, an incandescent lamp, a high-intensity discharge lamp (HID), or the like can be used. The instrument body 20 according to the present embodiment has high light transmissivity and light diffusivity, and thus is preferable because it can contribute to energy saving when used in an LED light source. It should be noted that a single light source may be used as the light source unit 30, or a plurality of light sources may be used as the light source unit 30.

  At the upper end of the lighting cover 40, an engaging portion 41 for hooking on the fixture body 20 can be provided. In the illustrated form, the engagement portion 41 is formed so as to protrude toward the inside of the instrument body 20. The engagement portion 41 may be provided over the entire circumference of the illumination cover 40 or may be provided in a part thereof.

  The lighting cover 40 can cover the opening 21. For example, as shown in FIG. 4, the lighting cover 40 having a substantially C-shaped cross section can be attached to the instrument body 20 from below while covering the light source unit 30. At this time, it is preferable that the light diffusion layer 17 is disposed closer to the light source unit 30 side than the translucent resin base material 12. By doing so, the luminaire 100 having high light transmittance can be obtained due to the convex portions on the surface of the light diffusion layer 17.

  As described above, the lighting fixture 100 according to the present embodiment includes the light source unit 30 and the lighting cover 40 that covers the light source unit 30. Therefore, for example, even when a light source having a high directivity such as an LED light source is used, it is possible to provide the lighting fixture 100 having high light transmittance and light diffusivity.

  Hereinafter, the present embodiment will be described in more detail with reference to Examples and Comparative Examples, but the present embodiment is not limited to these Examples.

[Example 1]
100 parts by mass of the inorganic particle-encapsulating silicone particles were added to 100 parts by mass of the solid content of the translucent resin. As the translucent resin, FCLEAR (registered trademark) KD200 manufactured by Kanto Denka Kogyo Co., Ltd. was used. Note that FCLEAR (registered trademark) KD200 contains a polyfluoroolefin copolymer and has a refractive index of 1.42. As the inorganic particle-containing silicone particles, MSP-AS02 manufactured by Nikko Rica Co., Ltd. was used. In MSP-AS02, alumina fine particles are encapsulated with silicone, the refractive index of the alumina fine particles is 1.76, and the average particle diameter of the alumina fine particles is 0.2 to 0.7 μm. The average particle size of MSP-AS02 is 2 μm. The refractive index of silicone is 1.42.

  Furthermore, it was diluted with propylene glycol monomethyl ether acetate so that the total solid content was 20% by mass. The diluted solution was stirred with a disper (stirrer) at 1500 rpm for 10 minutes to obtain a coating material.

  This coating is applied to the surface of the transparent resin substrate with a bar coater so that the film thickness is 10 μm, and the solvent is dried at 80 ° C. for 10 minutes to diffuse light onto the surface of the transparent resin substrate. An optical member having a layer formed was obtained. As the translucent resin base material, an acrylic plate having a 100 mm square and a thickness of 2 mm was used. As the acrylic plate, Sumipex (registered trademark) E000 manufactured by Sumitomo Chemical Co., Ltd. was used. The acrylic plate has a haze of 0.2% and a total light transmittance of 92.5%.

  Then, the obtained optical member was used as an illumination cover and attached to an integrated LED base light XL553PFV LE9 manufactured by Panasonic Corporation so that the light diffusion layer was arranged on the light source side, to obtain a lighting fixture.

[Example 2]
A lighting fixture was produced in the same procedure as in Example 1 except that 150 parts by mass of the inorganic particle-encapsulating silicone particles were added to 100 parts by mass of the solid content of the translucent resin.

[Example 3]
Instead of MSP-AS02 used in Example 1, MSP-AS04 manufactured by Nikko Rica Co., Ltd. was used as the inorganic particle-encapsulating silicone particles. Further, 150 parts by mass of the inorganic particle-encapsulating silicone particles were added to 100 parts by mass of the solid content of the translucent resin. Other than that, the lighting fixture was created in the same procedure as in Example 1. MSP-AS04 contains alumina fine particles, the refractive index of the alumina fine particles is 1.76, and the average particle diameter of the alumina fine particles is 0.2 to 0.7 μm. The average particle size of MSP-AS04 is 4 μm. The refractive index of silicone is 1.42.

[Example 4]
Instead of MSP-AS02 used in Example 1, MSP-TS04 manufactured by Nikko Rica Co., Ltd. was used as the inorganic particle-encapsulating silicone particles. Further, 80 parts by mass of the inorganic particle-encapsulating silicone particles were added to 100 parts by mass of the solid content of the translucent resin. Other than that, the lighting fixture was created in the same procedure as in Example 1. Note that MSP-TS04 contains titania fine particles, the titania fine particles have a refractive index of 2.4, and the titania fine particles have an average particle diameter of 0.2 μm. The average particle size of MSP-TS04 is 4 μm. The refractive index of silicone is 1.42.

[Comparative Example 1]
Instead of KD200 used in Example 1, a cured product of Polylite (registered trademark) RX-4800M manufactured by DIC Corporation and Takenate (registered trademark) D-103H manufactured by Mitsui Chemicals, Inc. was used as a light-transmitting resin. A luminaire was prepared in the same procedure as in Example 1 except for the above. The main component of Polylite (registered trademark) RX-4800M is polyester polyol, and the main component of Takenate (registered trademark) D-103H is toluene diisocyanate. The refractive index of the translucent resin after curing was 1.58.

[Comparative Example 2]
A lighting fixture was prepared in the same procedure as in Example 1 except that Tospearl (registered trademark) 120 manufactured by Momentive Performance Materials Co., Ltd. was used instead of the MSP-AS02 used in Example 1. Tospearl (registered trademark) 120 is a silicone particle that does not include inorganic particles. The average particle size of Tospearl (registered trademark) 120 is 2 μm, and the refractive index is 1.42.

[Comparative Example 3]
Instead of MSP-AS02 used in Example 1, MSP-TS04 manufactured by Nikko Rica Co., Ltd. was used as the inorganic particle-encapsulating silicone particles. Further, instead of the KD200 used in Example 1, a cured product of Polylite (registered trademark) RX-4800M manufactured by DIC Corporation and Takenate (registered trademark) D-103H manufactured by Mitsui Chemicals, Inc. is used as a light-transmitting resin. Using. Other than that, the lighting fixture was created in the same procedure as in Example 1. Note that MSP-TS04 contains titania fine particles, the titania fine particles have a refractive index of 2.4, and the titania fine particles have an average particle diameter of 0.2 μm. The average particle size of MSP-TS04 is 4 μm. The main component of Polylite (registered trademark) RX-4800M is polyester polyol, and the main component of Takenate (registered trademark) D-103H is toluene diisocyanate. The refractive index of the translucent resin after curing was 1.58.

[Comparative Example 4]
A lighting fixture was prepared in the same procedure as in Example 1 except that AA-1.5 manufactured by Sumitomo Chemical Co., Ltd. was used instead of the MSP-AS02 used in Example 1. The main component of AA-1.5 is alumina, the refractive index is 1.76, and the average particle size is 1.6 μm. Further, AA-1.5 alumina is not included in silicone.

[Comparative Example 5]
A lighting fixture was prepared in the same procedure as in Example 1 except that ST-750EC manufactured by Titanium Industry Co., Ltd. was used instead of the MSP-AS02 used in Example 1. The main component of ST-750EC is titania, the refractive index is 2.4, and the average particle size is 1.0 μm. Also, ST-750EC titania is not encapsulated in silicone.

[Evaluation]
The lighting fixtures obtained in Examples 1 to 4 and Comparative Examples 1 to 5 were evaluated for the following items. Table 1 shows the details of each example and the evaluation results.

[Equipment efficiency]
The total luminous flux of the lighting fixture obtained in each example was measured, and the total luminous flux ratio of each example was calculated when the total luminous flux of the reference lighting fixture was 100. The total luminous flux was measured by a 165 cm integrating sphere manufactured by Labsphere, using a measuring system manufactured by the same. Also, the total luminous flux of the reference lighting fixture is 1800 lm. The criteria for judgment are as follows.
・ Judgment criteria 103% or more: ○
100% or more and less than 103%: △
Less than 100%: ×

[Light uniformity]
The above-mentioned LED base light XL553PFV LE9 was not suitable for measuring the light uniformity due to the small distance between the LED light sources, so two LEDs placed 3 cm apart were covered with the lighting cover obtained in each example. The light uniformity in each case was evaluated. As the LED, NSSW157D manufactured by Nichia Corporation was used. Further, the lighting cover was arranged at a position 3 cm away from the LED so that the light diffusion layer was on the LED side. Further, a color luminance meter BM-7 manufactured by Topcon Techno House Co., Ltd. was arranged at a position 30 cm away from the lighting cover. Then, on the line segment connecting the two LEDs, the values at which the brightness is maximum and minimum were measured. The light uniformity is calculated as {(minimum value of luminance) / (maximum value of luminance)} × 100. The criteria for judgment are as follows.
・ Criteria 70% or more: ○
60 or more and less than 70: △
Less than 60%: ×

  In Examples 1 to 4, the light diffusing layer contains a translucent resin having a refractive index of 1.49 or less, and inorganic particle-encapsulating silicone particles in which a plurality of inorganic particles are encapsulated in silicone. Therefore, in the optical members of Examples 1 to 4, the instrument efficiency and the light uniformity satisfy the predetermined determination criteria. That is, it was confirmed that the optical members of Examples 1 to 4 had both light transmittance and light diffusivity.

  On the other hand, in the optical member of Comparative Example 1, the translucent resin has a refractive index of 1.58. Therefore, the instrument efficiency has fallen below the predetermined criterion. Presumably, Fresnel reflection at the interface between the air layer and the light diffusion layer reduced the light transmittance.

  The optical member of Comparative Example 2 does not include a plurality of inorganic particles in silicone. Therefore, the light uniformity has fallen below the predetermined criterion. Presumably, the difference in refractive index between the translucent resin and the silicone was small, and the inorganic particles were not encapsulated in the silicone, so it is considered that the light diffusion property was insufficient.

In the optical member of Comparative Example 3, the translucent resin has a refractive index of 1.58. Therefore, the instrument efficiency has fallen below the predetermined criterion. Presumably, Fresnel reflection at the interface between the air layer and the light diffusion layer reduced the light transmittance. Further, since TiO ₂ having a high refractive index was used as the encapsulated particles, the light diffusion property was improved, but on the other hand, it is considered that the light transmission property was decreased.

  The optical member of Comparative Example 4 uses aluminum oxide that is not included in silicone. Therefore, the instrument efficiency and the light uniformity are below the predetermined criteria. Presumably, the refractive indexes of the fluororesin and aluminum oxide were too large and the light transmittance was lowered. It is also considered that aluminum oxide was precipitated and aggregated at the time of coating, and the light diffusion property was lowered.

  The optical member of Comparative Example 5 uses titanium oxide that is not encapsulated in silicone. Therefore, the instrument efficiency has fallen below the predetermined criterion. Presumably, the difference in refractive index between the fluororesin and titanium oxide was too large, and the light transmittance was lowered.

  Although the contents of the present embodiment have been described above with reference to the examples, the present embodiment is not limited to these descriptions, and it is obvious to those skilled in the art that various modifications and improvements are possible. is there.

Reference Signs List 11 optical member 12 translucent resin base material 13 translucent resin 14 silicone 15 inorganic particles 16 inorganic particle-encapsulating silicone particles 17 light diffusion layer 30 light source section 40 lighting cover 100 lighting equipment

Claims (7)

A transparent resin base material,
A light-diffusing layer provided on the surface of the translucent resin base material, which contains a translucent resin having a refractive index of 1.49 or less, and inorganic particle-encapsulated silicone particles in which a plurality of inorganic particles are encapsulated in silicone. ,
Equipped with
An optical member wherein the light-transmitting resin you containing fluorine resin.   The optical member according to claim 1, wherein the inorganic particles have a refractive index of 1.7 to 2.5.   The optical member according to claim 1, wherein the inorganic particles contain at least one of aluminum oxide and titanium oxide.   Content of the said inorganic particle inclusion silicone particle in the said light-diffusion layer is 66-150 mass parts with respect to 100 mass parts of the said transparent resin, The optical as described in any one of Claims 1-3. Element.   An illumination cover using the optical member according to claim 1. A light source section,
The lighting cover according to claim 5, which covers the light source unit,
Lighting equipment.   The lighting device according to claim 6, wherein the light diffusion layer is disposed closer to the light source unit than the translucent resin base material.

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