WO2014057680A1 - Optical component and lighting cover - Google Patents
Optical component and lighting cover Download PDFInfo
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- WO2014057680A1 WO2014057680A1 PCT/JP2013/006042 JP2013006042W WO2014057680A1 WO 2014057680 A1 WO2014057680 A1 WO 2014057680A1 JP 2013006042 W JP2013006042 W JP 2013006042W WO 2014057680 A1 WO2014057680 A1 WO 2014057680A1
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- functional layer
- particles
- resin
- optical member
- transparent resin
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
- B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/10—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by coatings
- F21V3/12—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by coatings the coatings comprising photoluminescent substances
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/02—Synthetic macromolecular particles
- B32B2264/0214—Particles made of materials belonging to B32B27/00
- B32B2264/025—Acrylic resin particles, e.g. polymethyl methacrylate or ethylene-acrylate copolymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
- B32B2264/102—Oxide or hydroxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/418—Refractive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2551/00—Optical elements
Definitions
- the present invention relates to an optical member having light transparency and light diffusion, and an illumination cover formed using the optical member.
- a light transmitting / diffusing member for lighting equipment such as a lighting cover, covers the front side of the lighting equipment, etc., and diffuses the light from the light source over the entire surface of the lighting cover, thereby averaging the light transmission and transmitting light. To prevent uneven light and dark spots. At the same time, the light cover is used to hide the image of the light source and enhance the quality of the device.
- a white pigment is mixed in a resin sheet used to form a general lighting cover. As the white pigment, silicon oxide, barium sulfate, calcium carbonate, titanium oxide, mica, magnesium oxide, talc, aluminum hydroxide, aluminum oxide and the like are used.
- a common diffusion member is made of a transparent resin in which diffusion particles having a difference in refractive index from the resin are dispersed to be processed into a molded body or sheet. Also, it may be coated on a transparent substrate.
- factors that affect transmission and diffusion of light include resin, refractive index of diffusion particles, addition amount of diffusion particles, particle size, particle shape, diffusion layer thickness, surface shape and the like.
- Patent Documents 1 and 2 There are also a large number of prior art documents (see, for example, Patent Documents 1 and 2), but almost all of them are only optimized within the compatible region of the above transmittance and diffusivity. It is thought that it is not what is compatible in the transmittance
- transparent glass beads are used as the diffusing agent, not white pigments or resin particles. It is interesting to include transparent particles that have a refractive index difference with the resin, but the trade-off between transmittance and diffusivity does not change depending on the refractive index of the glass beads. Furthermore, since the total light transmittance and haze are evaluated, the diffusivity is unknown, and it has not been proved that the transparency and diffusivity that are the object of the present invention are compatible. This is because although there is a value of diffuse transmittance calculated from haze, the lamp image of a highly directional LED light source also depends on the distance to the light source and does not disappear if the haze is close to 100%. .
- Patent Document 2 describes a member having a diffusion layer on both sides of a transparent substrate, but the member is one in which the same diffusion layer is completely introduced on both sides of the substrate, and is doubled on one side of the substrate It can be said that the same performance as a member introduced with a diffusion layer with a thickness of Furthermore, if the same diffusion layer is introduced on both sides of the substrate, it leads to the improvement of the diffusivity and the reduction of the lamp image, but the reduction of the transmittance is inevitable. Therefore, it can not be said that light transmission and diffusion can not be compatible.
- the present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide an optical member and a lighting cover which can balance light transmittance and light diffusivity in a trade-off relationship in a well-balanced manner. It is a thing.
- the optical member according to the present invention is formed by providing a first functional layer on one surface of a transparent substrate and providing a second functional layer on the other surface of the transparent substrate, and using the first functional layer as a light source It is an optical member that is used in a direction, wherein the first functional layer contains a first transparent resin and a first particle, and the difference in refractive index between the first transparent resin and the first particle is greater than 0 and 0. .07 or less, the surface on the light source side of the first functional layer is formed unevenly by the first particles, the second functional layer contains a second transparent resin and a second particle, and the second The difference in refractive index between the transparent resin and the second particles is 0.10 to 0.25.
- the average particle diameter of the second particles is preferably 0.8 to 5 ⁇ m.
- the refractive index of the first transparent resin and the second transparent resin be smaller than the refractive index of the transparent base material.
- a center line average roughness (Ra) of the first functional layer is 2 to 15 ⁇ m.
- the first transparent resin and the second transparent resin be an acrylic resin having at least one of a fluoroalkyl group and a fluoroalkylene group in a side chain.
- the first particles are selected from the group consisting of spherical silicone resin particles, silicon oxide particles, and porous acrylic resin particles.
- the second particles are preferably spherical benzoguanamine resin particles.
- the transparent base is formed of at least one of an acrylic resin and a polycarbonate resin.
- An illumination cover according to the present invention is characterized by being formed using the optical member.
- FIG. 1 is a schematic cross-sectional view schematically showing an example (Examples 1 to 3) of an optical member according to the present invention. It is a schematic sectional drawing which shows typically an example (comparative examples 1 and 4) of the conventional optical member. It is a schematic sectional drawing which shows typically another example (comparative example 2, 3, 5) of the conventional optical member. It is a schematic sectional drawing which shows typically another example (comparative example 6) of the conventional optical member. It is a schematic sectional drawing which shows typically another example (comparative example 7) of the conventional optical member. It is the graph which plotted the diffusivity with respect to the transmittance
- FIG. 1 shows an example of an optical member 3 according to the present invention.
- This optical member 3 is provided with a first functional layer 10 on one side of a transparent substrate 1 and on the other side of the transparent substrate 1
- the second functional layer 20 is provided.
- the optical member 3 is used with the first functional layer 10 directed to the light source 2 such as an LED.
- the transparent substrate 1 is not particularly limited as long as it has transparency, but, for example, acrylic resin (polymer of acrylic ester or methacrylic ester), polycarbonate resin, polyester resin, What was formed with styrene resin, glass, etc. can be used.
- acrylic resin and the polycarbonate resin have high light transmittance
- the transparent substrate 1 is preferably formed of at least one of an acrylic resin and a polycarbonate resin.
- the thickness of the transparent substrate 1 is preferably 0.1 to 3 mm in consideration of formability, but the shorter the distance between the first functional layer 10 and the second functional layer 20, the better the light transmission of the optical member 3
- the thickness is more preferably 0.1 to 2 mm because it has a positive effect on the sex and light diffusion.
- the transmittance of the transparent substrate 1 is preferably 90 to 100%, the haze is preferably 0 to 1%, and the diffusivity is preferably 0 to 1%.
- the first functional layer 10 is a layer mainly having a function of taking in and transmitting light, and contains the following first transparent resin 11 and first particles 12.
- the first transparent resin 11 is not particularly limited, but it is preferable to use one that does not totally reflect light at the interface with the transparent substrate 1. That is, the refractive index of the first transparent resin 11 is preferably smaller than the refractive index of the transparent substrate 1.
- the first transparent resin 11 is preferably an acrylic resin in consideration of transparency, light resistance, moldability and the like.
- the acrylic resin is not particularly limited, but, for example, a homopolymer of methyl methacrylate or a copolymer of methyl methacrylate and acrylates such as methyl acrylate, butyl acrylate and ethylhexyl acrylate can be used. .
- the refractive index of acrylic resin is 1.49, when using what was formed with acrylic resin as transparent substrate 1 and using acrylic resin also for the 1st transparent resin 11, both refractive index is almost It becomes equal and there is a possibility that light may be totally reflected at the interface of both. Therefore, in such a case, the first transparent resin 11 is preferably an acrylic resin having at least one of a fluoroalkyl group and a fluoroalkylene group in a side chain.
- the following formula (1) shows an example of the repeating unit of such an acrylic resin. If the first transparent resin 11 is such an acrylic resin, the refractive index can be reduced compared to the transparent substrate 1. Further, the fluoroalkyl group and the fluoroalkylene group can also enhance antifouling property, water repellency and oil repellency.
- the first transparent resin 11 is preferably a thermoplastic resin, but may be a thermosetting resin.
- the first particles 12 in order to enhance the light transmittance in the first functional layer 10, those having a difference in refractive index with the first transparent resin 11 of more than 0 and not more than 0.07 are used. It is preferably more than 0 and not more than 0.03, and particularly preferably more than 0 and not more than 0.01.
- the first particles 12 are preferably selected from the group consisting of spherical silicone resin particles, silicon oxide particles, and porous acrylic resin particles.
- the refractive index of the first particle 12 is high, and the refractive index of the first transparent resin 11 is low. However, if the difference between the refractive indices of the two is greater than 0 and less than or equal to 0.07, the refraction of the first particle 12 is The index may be low and the refractive index of the first transparent resin 11 may be high.
- the average particle size of the first particles 12 is not particularly limited, but is preferably 5 to 15 ⁇ m.
- the average particle size means the particle size at 50% of the integrated value in the particle size distribution determined by the laser diffraction / scattering method.
- the first functional layer 10 can be formed as follows. First, the first particles 12 are added to the first transparent resin 11 so that the first particles 12 become 20 to 150 parts by mass (preferably 35 to 125 parts by mass) with respect to 100 parts by mass of the solid content of the first transparent resin 11
- the first paint is prepared by dispersing and appropriately diluting this with a solvent such as methyl ethyl ketone.
- the first paint is coated on one surface of the transparent substrate 1 by a bar coater or the like, and then dried at an appropriate temperature and time to form the first functional layer 10.
- the surface on the light source 2 side of the first functional layer 10 formed in this manner is formed in an uneven shape by the first particles 12. Thereby, the light from the light source 2 can be taken in efficiently. If the asperity shape on the surface of the first functional layer 10 is more uniform, the light uptake is further improved, so the shape of the first particle 12 is preferably spherical rather than amorphous.
- the center line average roughness (Ra) of the first functional layer 10 is preferably 2 to 15 ⁇ m, and more preferably 4 to 6 ⁇ m. Also in this case, the light uptake is further improved.
- the center line average roughness (Ra) can be measured using, for example, “shape measurement laser microscope VK-8700 / 9700” manufactured by Keyence Corporation.
- the average thickness of the first functional layer 10 is preferably 5 to 15 ⁇ m in consideration of cost and productivity.
- the average thickness of the first functional layer 10 is, for example, peeling off a portion of the first functional layer 10 to expose the transparent base material 1, “shape measurement laser microscope VK-8700 / 9700” manufactured by Keyence Corporation.
- the height difference between the transparent base material 1 and the first transparent resin 11 can be measured at 10 points using “etc.”, and can be calculated as an average value thereof.
- the second functional layer 20 is a layer mainly having a function of diffusing and extracting light, and contains the following second transparent resin 21 and second particles 22.
- the second transparent resin 21 is not particularly limited, but it is preferable to use one having a refractive index close to that of air. That is, the refractive index of the second transparent resin 21 is preferably smaller than the refractive index of the transparent substrate 1. Thus, the light diffused in the second functional layer 20 can be easily emitted from the second functional layer 20 into the air.
- the second transparent resin 21 is preferably an acrylic resin.
- the second transparent resin 21 also has at least one of a fluoroalkyl group and a fluoroalkylene group in the side chain similarly to the first transparent resin 11. It is preferable that it is an acrylic resin.
- the second transparent resin 21 is preferably a thermoplastic resin, but may be a thermosetting resin.
- the second particles 22 in order to enhance the diffusibility in the second functional layer 20, those having a difference in refractive index with the second transparent resin 21 of 0.10 to 0.25 are used. Preferably, it is 0.15 to 0.25.
- the second particles 22 are preferably spherical benzoguanamine resin particles.
- the refractive index of the second particle 22 is high, and the refractive index of the second transparent resin 21 is low. However, if the difference between the refractive indices of the two is 0.10 to 0.25, the refractive index of the second particle 22 And the refractive index of the second transparent resin 21 may be high.
- the difference between the two refractive indices is less than 0.10, the diffusivity can not be enhanced, and if the difference between the two refractive indices is greater than 0.25, the diffusivity almost plateaus, and only the transmittance Tend to decrease.
- the average particle diameter of the second particles 22 is preferably 0.8 to 5 ⁇ m, and more preferably 1 to 3 ⁇ m.
- the second functional layer 20 can be formed as follows. First, the second particles 22 are added to the second transparent resin 21 so that the second particles 22 become 20 to 150 parts by mass (preferably 25 to 125 parts by mass) with respect to 100 parts by mass of the solid content of the second transparent resin 21
- the second paint is prepared by dispersing and appropriately diluting this with a solvent such as methyl ethyl ketone.
- the second paint is coated on the other surface of the transparent substrate 1 by a bar coater or the like, and then dried at an appropriate temperature and time to form the second functional layer 20.
- the center line average roughness (Ra) of the second functional layer 20 is preferably 0.1 to 4 ⁇ m.
- the average thickness of the second functional layer 20 is preferably 5 to 15 ⁇ m in consideration of cost and productivity.
- the average thickness of the second functional layer 20 is, for example, peeling off a part of the second functional layer 20 to expose the transparent substrate 1, “shape measurement laser microscope VK-8700 / 9700” manufactured by Keyence Corporation.
- the height difference between the transparent base material 1 and the second transparent resin 21 can be measured at 10 points using “etc.” and calculated as an average value thereof.
- the second functional layer 20 may be provided after the first functional layer 10 is provided on the transparent substrate 1, or the second functional layer 20 may be provided on the transparent substrate 1.
- One functional layer 10 may be provided, or the first functional layer 10 and the second functional layer 20 may be provided simultaneously on the transparent substrate 1.
- the optical member 3 formed as described above has the first functional layer 10 and the second functional layer 20 having different functions on both surfaces of the transparent substrate 1. That is, the first functional layer 10 is located on the light source 2 side to improve mainly the light transmittance, and the second functional layer 20 is located on the opposite side to the light source 2 to mainly improve the light diffusivity. It is a thing. Thus, by positioning the first functional layer 10 on the light source 2 side, it is possible to make it easier to take in light from the light source 2 than when there is no first functional layer 10 (see FIG. 3). Furthermore, high haze can be achieved only with the first functional layer 10, resulting in high light transmittance and high haze, and although the lamp image can not be erased, the first functional layer 10 also has some light diffusion. .
- the directivity characteristic of the light source 2 is converted and light is made incident on the second functional layer 20, light having a larger incident angle is irradiated, so that the first functional layer 10 is not present (see FIG. 3).
- Light diffusivity is also improved compared to. Therefore, the transmittance can be increased by the first functional layer 10, and the diffusivity can be increased by the synergistic effect of the first functional layer 10 and the second functional layer 20, and the light transmittance and the light diffusion are in a trade-off relationship. It is possible to achieve a balance between sexuality and well-being.
- the refractive index of the first transparent resin 11 and the second transparent resin 21 is smaller than the refractive index of the transparent substrate 1, light from the light source 2 can be easily taken in, and the taken light can be easily taken out. It is also possible.
- the illumination cover 4 according to the present invention can be formed using the above-described optical member 3.
- the optical member 3 may be used as the illumination cover 4 as it is in the form of a flat plate, but may be used as the illumination cover 4 in a predetermined shape according to the shape of the light source 2 or the like.
- the first transparent resin 11 and the second transparent resin 21 are thermosetting resin, there is a possibility that a crack may occur in the first functional layer 10 or the second functional layer 20 Therefore, in this case, the first transparent resin 11 and the second transparent resin 21 are preferably thermoplastic resins.
- Example 1 An acrylic plate (50 mm ⁇ 70 mm ⁇ thickness 2 mm, refractive index 1.49, transmittance 92.5%, haze 0.2%, diffusion rate 0%) formed of acrylic resin was used as the transparent substrate 1 .
- N 3818 (refractive index: 1.42) manufactured by Kanto Denka Kogyo Co., Ltd., which is an acrylic resin having at least one of a fluoroalkyl group and a fluoroalkylene group in the side chain as the first transparent resin 11 and the second transparent resin 21 was used.
- Tospearl 1110 (refractive index: 1.42, average particle diameter: 11 ⁇ m) manufactured by Momentive Performance Materials Japan Ltd., which is spherical silicone resin particles, was used.
- spherical benzoguanamine-based resin particles “Epostor MS” (benzoguanamine formaldehyde condensate, refractive index 1.66, average particle diameter 1 to 3 ⁇ m) manufactured by Nippon Shokubai Co., Ltd. were used.
- the first functional layer 10 was formed as follows. First, the first particles 12 are dispersed in the first transparent resin 11 so that the first particles 12 become 100 parts by mass with respect to 100 parts by mass of the solid content of the first transparent resin 11, and the non-volatile matter is 26% by mass
- the first paint was prepared by diluting with methyl ethyl ketone so that Next, the first paint was coated on one side of the transparent substrate 1 by a bar coater (# 40), and dried at 80 ° C. for 10 minutes to form a first functional layer 10.
- the center line average roughness (Ra) of the first functional layer 10 was 5.2 ⁇ m, and the average thickness of the first functional layer 10 was about 7 to 8 ⁇ m.
- the second functional layer 20 was formed as follows. First, the second particles 22 are dispersed in the second transparent resin 21 so that the second particles 22 become 100 parts by mass with respect to 100 parts by mass of the solid content of the second transparent resin 21. A second paint was prepared by diluting with methyl ethyl ketone so that Next, the second paint was coated on the other side of the transparent substrate 1 by a bar coater (# 40), and dried at 80 ° C. for 10 minutes to form a second functional layer 20.
- the center line average roughness (Ra) of the second functional layer 20 was 1.5 ⁇ m, and the average thickness of the second functional layer 10 was about 10 ⁇ m.
- an optical member 3 as shown in FIG. 1 was manufactured.
- Example 2 The same transparent substrate 1 as in Example 1 was used.
- the first functional layer 10 was formed in the same manner as in Example 1.
- the second functional layer 20 was formed as follows. First, the second particles 22 are dispersed in the second transparent resin 21 so that the second particles 22 become 33 parts by mass with respect to 100 parts by mass of the solid content of the second transparent resin 21. A second paint was prepared by diluting with methyl ethyl ketone so that Next, the second paint was coated on the other side of the transparent substrate 1 by a bar coater (# 40), and dried at 80 ° C. for 10 minutes to form a second functional layer 20.
- the center line average roughness (Ra) of the second functional layer 20 was 1.3 ⁇ m, and the average thickness of the second functional layer 10 was about 9 ⁇ m.
- an optical member 3 as shown in FIG. 1 was manufactured.
- Example 3 The same transparent substrate 1 as in Example 1 was used.
- first transparent resin 11 and the second transparent resin 21 the same ones as in Example 1 were used.
- MBP-8 porous spherical fine particles of crosslinked polymethyl methacrylate, refractive index 1.49, average particle diameter 8 ⁇ m
- Sekisui Chemical Co., Ltd. which is porous acrylic resin particles Using.
- the first functional layer 10 was formed as follows. First, the first particles 12 are dispersed in the first transparent resin 11 so that the first particles 12 become 54 parts by mass with respect to 100 parts by mass of the solid content of the first transparent resin 11, and the non-volatile matter is 21% by mass
- the first paint was prepared by diluting with methyl ethyl ketone so that Next, the first paint was coated on one side of the transparent substrate 1 by a bar coater (# 40), and dried at 80 ° C. for 10 minutes to form a first functional layer 10.
- the center line average roughness (Ra) of the first functional layer 10 was 4.6 ⁇ m, and the average thickness of the first functional layer 10 was 9 ⁇ m.
- the second functional layer 20 was formed as follows. First, the second particles 22 are dispersed in the second transparent resin 21 so that the second particles 22 are 54 parts by mass with respect to 100 parts by mass of the solid content of the second transparent resin 21. A second paint was prepared by diluting with methyl ethyl ketone so that Next, the second paint was coated on the other side of the transparent substrate 1 by a bar coater (# 40), and dried at 80 ° C. for 10 minutes to form a second functional layer 20.
- the center line average roughness (Ra) of the second functional layer 20 was 1.4 ⁇ m, and the average thickness of the second functional layer 10 was 9.6 ⁇ m.
- an optical member 3 as shown in FIG. 1 was manufactured.
- Example 1 In Example 1, by providing only the first functional layer 10 on one surface of the transparent substrate 1 and not providing the second functional layer 20 on the other surface of the transparent substrate 1, optical as shown in FIG. The member 3 was manufactured.
- Example 2 In Example 1, by providing only the second functional layer 20 on the other surface of the transparent substrate 1 without providing the first functional layer 10 on one surface of the transparent substrate 1, optical as shown in FIG. The member 3 was manufactured.
- Example 3 (Comparative example 3) In Example 2, by providing only the second functional layer 20 on the other surface of the transparent substrate 1 without providing the first functional layer 10 on one surface of the transparent substrate 1, optical as shown in FIG. The member 3 was manufactured.
- Example 4 In Example 3, by providing only the first functional layer 10 on one surface of the transparent substrate 1 and not providing the second functional layer 20 on the other surface of the transparent substrate 1, the optical as shown in FIG. The member 3 was manufactured.
- Example 5 (Comparative example 5) In Example 3, by providing only the second functional layer 20 on the other surface of the transparent substrate 1 without providing the first functional layer 10 on one surface of the transparent substrate 1, optical as shown in FIG. The member 3 was manufactured.
- a diffusion film 30 formed by providing a light diffusion layer 32 with a thickness of 12.5 ⁇ m on both sides of a film base 31 made of a transparent PET film with a thickness of 100 ⁇ m Kimoto-made "100 PBU" was used.
- a polycarbonate sheet 40 with a thickness of 2 mm (“Light Opal” manufactured by Asahi Glass Co., Ltd.) manufactured by kneading a diffusing agent 42 in a resin 41 was used.
- Example 1 When Example 1 and Comparative Example 1 are compared, it was found that in Comparative Example 1, the lamp image of the light source 2 is easily visible through the optical member 3, whereas in Example 1 the lamp image is hard to be viewed. .
- Example 1 and Comparative Example 2 were compared, it turned out that the transparency and light diffusivity of Example 1 are both enhanced as compared with Comparative Example 2.
- Example 2 and Comparative Example 3 were compared, it turned out that the transparency and light diffusivity of Example 2 are both enhanced as compared with Comparative Example 3.
- Example 3 and Comparative Example 4 are compared, it is understood that in Comparative Example 4, the lamp image of the light source 2 is easy to be seen through the optical member 3 while in Example 3 the lamp image is hard to be recognized.
- Example 3 has both transparency and light diffusivity improved compared with Comparative Example 5.
- Examples 1 to 3 and Comparative Examples 6 and 7 are compared, it is found that Examples 1 to 3 are all located in the upper right region of the straight line B, as shown in FIG.
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- Laminated Bodies (AREA)
Abstract
Provided are an optical component and a lighting cover whereby both satisfactory light transmitting properties and light diffusing properties, which have a tradeoff relationship, can be achieved in a balanced manner. The present invention relates to an optical component (3) having a first functional layer (10) furnished to one surface of a transparent substrate (1) and a second functional layer (20) furnished to the other surface of the transparent substrate, and designed to be used with the first functional layer (10) facing towards a light source (2). The first functional layer (10) includes a first transparent resin (11) and first particles (12). The refractive index differential between the first transparent resin (11) and the first particles (12) is greater than 0 but does not exceed 0.07. The surface of the first functional layer (10) on the light source (2) side thereof is formed to irregular shape by the first particles (12). The second functional layer (20) contains a second transparent resin (21) and second particles (22). The refractive index differential between the second transparent resin (21) and the second particles (22) is 0.10 to 0.25 inclusive.
Description
本発明は、光透過性及び光拡散性を有する光学部材及びこの光学部材を用いて形成された照明カバーに関するものである。
The present invention relates to an optical member having light transparency and light diffusion, and an illumination cover formed using the optical member.
照明器具用の光透過・拡散部材、例えば照明カバーは、照明器具において器具の前面側等を覆い、光源からの光を照明カバーの全面に拡散させることによって、光透過を平均化して透光面に明暗のむらができるのを防ぐ。それと同時に照明カバーは、光源のイメージを隠蔽して器具の品格を高めるのに使用される。一般的な照明カバーの成形に用いる樹脂シートには白色の顔料が混入されている。この白色顔料としては、酸化ケイ素、硫酸バリウム、炭酸カルシウム、酸化チタン、雲母、酸化マグネシウム、タルク、水酸化アルミニウム、酸化アルミニウム等が用いられる。
A light transmitting / diffusing member for lighting equipment, such as a lighting cover, covers the front side of the lighting equipment, etc., and diffuses the light from the light source over the entire surface of the lighting cover, thereby averaging the light transmission and transmitting light. To prevent uneven light and dark spots. At the same time, the light cover is used to hide the image of the light source and enhance the quality of the device. A white pigment is mixed in a resin sheet used to form a general lighting cover. As the white pigment, silicon oxide, barium sulfate, calcium carbonate, titanium oxide, mica, magnesium oxide, talc, aluminum hydroxide, aluminum oxide and the like are used.
しかしながら、従来の方法では、十分な拡散性を付与するのに必要な量の顔料を添加すると光透過性が大きく低下し、明るさを犠牲にするのが避けられず、光の透過性と拡散性とは相反し、トレードオフの関係を有する。また近年、省エネルギーの観点からLED照明器具が注目されているが、LED光源は指向性が強いため、さらなる拡散性が必要とされる。一方で省エネルギー化を目的としているLED照明の器具効率を照明カバーで大幅に低下させるわけにはいかないため、従来の蛍光灯用カバー材よりもさらに高い光透過・拡散性が必要とされる。
However, in the conventional method, when the pigment necessary for imparting sufficient diffusivity is added, the light transmittance is greatly reduced, and the sacrifice of the brightness can not be avoided, and the light transmittance and the diffusion can not be avoided. There is a trade-off relationship that contradicts sex. Also, in recent years, LED lighting equipment has attracted attention from the viewpoint of energy saving, but since the LED light source has high directivity, further diffusion is required. On the other hand, since it is not possible to significantly reduce the efficiency of the fixtures of the LED lighting intended for energy saving by the lighting cover, it is necessary to have higher light transmission and diffusion than the conventional fluorescent lamp cover materials.
上記のような相反する光の透過・拡散を両立させるため様々な検討が行われている。一般的な拡散部材は透明樹脂にその樹脂と屈折率差のある拡散粒子を分散させ、成形体状、シート状に加工される。また、透明基材へコーティングされる場合もある。このような部材において光の透過・拡散に影響を与える因子としては、樹脂、拡散粒子の屈折率、拡散粒子の添加量、粒径、粒子形状、拡散層の厚さ、表面形状などがある。
Various studies have been conducted in order to achieve both the transmission and the diffusion of opposite light as described above. A common diffusion member is made of a transparent resin in which diffusion particles having a difference in refractive index from the resin are dispersed to be processed into a molded body or sheet. Also, it may be coated on a transparent substrate. In such a member, factors that affect transmission and diffusion of light include resin, refractive index of diffusion particles, addition amount of diffusion particles, particle size, particle shape, diffusion layer thickness, surface shape and the like.
本発明に至るまでの検討で、1層の拡散層で球状の拡散粒子を用いた場合、屈折率や添加量、拡散粒子径、厚さ、表面凹凸をどのような条件にしても光の透過率、拡散率はあるところまでしか両立し得ないことが判明した。すなわち、図6に示すように透過率に対して拡散率をプロットしたグラフにおいて限界線(直線B)が存在することが、実験と計算の両方から判明した。異種の拡散粒子を複合してもその域を超えることはない。拡散粒子の形状については様々なものが存在するが、実験的に上記限界線(直線B)より高透過・高拡散になるものは見つかっていない。最適な形状が存在したとしても、その形状の粒子が規則的に配列した構造が必要になることが考えられ、現実的ではない。
In the study leading to the present invention, when spherical diffusion particles are used in a single diffusion layer, light transmission is possible under any conditions of refractive index, addition amount, diffusion particle diameter, thickness, and surface unevenness. It turned out that the rate and the diffusion rate are compatible only to a certain point. That is, it was found from both the experiment and the calculation that the limit line (straight line B) exists in the graph in which the diffusivity is plotted against the transmittance as shown in FIG. Even if different kinds of diffusion particles are combined, the range is not exceeded. There are various shapes of the diffusing particles, but experimentally, there has not been found any one which is higher in transmission and higher in diffusion than the limit line (straight line B). Even if there is an optimum shape, it is conceivable that a structure in which particles of that shape are regularly arranged is required, which is not realistic.
また多くの先行技術文献(例えば、特許文献1、2参照)が存在するが、そのほぼ全てが上記の透過率と拡散率の両立可能な領域内で最適化しているだけにすぎず、本当の意味で透過率と拡散率を両立しているものではないと考えられる。
There are also a large number of prior art documents (see, for example, Patent Documents 1 and 2), but almost all of them are only optimized within the compatible region of the above transmittance and diffusivity. It is thought that it is not what is compatible in the transmittance | permeability and the diffusivity in the meaning.
例えば、特許文献1では拡散剤として白色顔料や樹脂粒子ではなく、透明なガラスビーズを用いている。樹脂と屈折率差のある透明な粒子を含有させる点は興味深いが、ガラスビーズの屈折率に応じて透過率と拡散率がトレードオフするのは変わりない。さらに、全光線透過率とヘーズ(曇り度)で評価されているので、拡散率は不明であり、本発明の目的である透過性と拡散性を両立できているという証明にはなっていない。なぜなら、ヘーズから算出した拡散透過率の値はあるが、指向性の強いLED光源のランプイメージは、光源との距離にも依存し、ヘーズが100%に近ければ消えるというものではないからである。
For example, in Patent Document 1, transparent glass beads are used as the diffusing agent, not white pigments or resin particles. It is interesting to include transparent particles that have a refractive index difference with the resin, but the trade-off between transmittance and diffusivity does not change depending on the refractive index of the glass beads. Furthermore, since the total light transmittance and haze are evaluated, the diffusivity is unknown, and it has not been proved that the transparency and diffusivity that are the object of the present invention are compatible. This is because although there is a value of diffuse transmittance calculated from haze, the lamp image of a highly directional LED light source also depends on the distance to the light source and does not disappear if the haze is close to 100%. .
また特許文献2では、透明基材の両面に拡散層を有する部材について記載されているが、その部材は基材の両面に全く同じ拡散層を導入したものであり、基材の片面に2倍の厚さで拡散層を導入した部材とほぼ同じ性能であるといってもよいと考えられる。さらに、同じ拡散層を基材の両面に導入した場合、拡散性の向上、ランプイメージの低減には繋がるが、透過率の減少は避けられない。したがって、光の透過と拡散を両立できているものではないといえる。
Further, Patent Document 2 describes a member having a diffusion layer on both sides of a transparent substrate, but the member is one in which the same diffusion layer is completely introduced on both sides of the substrate, and is doubled on one side of the substrate It can be said that the same performance as a member introduced with a diffusion layer with a thickness of Furthermore, if the same diffusion layer is introduced on both sides of the substrate, it leads to the improvement of the diffusivity and the reduction of the lamp image, but the reduction of the transmittance is inevitable. Therefore, it can not be said that light transmission and diffusion can not be compatible.
本発明は上記の点に鑑みてなされたものであり、トレードオフの関係にある光透過性と光拡散性とをバランスよく両立させることができる光学部材及び照明カバーを提供することを目的とするものである。
The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide an optical member and a lighting cover which can balance light transmittance and light diffusivity in a trade-off relationship in a well-balanced manner. It is a thing.
本発明に係る光学部材は、透明基材の一方の面に第一機能層を設け、前記透明基材の他方の面に第二機能層を設けて形成され、前記第一機能層を光源に向けて用いられる光学部材であって、前記第一機能層が第一透明樹脂及び第一粒子を含有し、前記第一透明樹脂と前記第一粒子との屈折率の差が0よりも大きく0.07以下であり、前記第一機能層の前記光源側の表面が前記第一粒子により凹凸形状に形成され、前記第二機能層が第二透明樹脂及び第二粒子を含有し、前記第二透明樹脂と前記第二粒子との屈折率の差が0.10~0.25である。
The optical member according to the present invention is formed by providing a first functional layer on one surface of a transparent substrate and providing a second functional layer on the other surface of the transparent substrate, and using the first functional layer as a light source It is an optical member that is used in a direction, wherein the first functional layer contains a first transparent resin and a first particle, and the difference in refractive index between the first transparent resin and the first particle is greater than 0 and 0. .07 or less, the surface on the light source side of the first functional layer is formed unevenly by the first particles, the second functional layer contains a second transparent resin and a second particle, and the second The difference in refractive index between the transparent resin and the second particles is 0.10 to 0.25.
前記光学部材において、前記第二粒子の平均粒子径が0.8~5μmであることが好ましい。
In the optical member, the average particle diameter of the second particles is preferably 0.8 to 5 μm.
前記光学部材において、前記第一透明樹脂及び前記第二透明樹脂の屈折率が前記透明基材の屈折率よりも小さいことが好ましい。
In the optical member, it is preferable that the refractive index of the first transparent resin and the second transparent resin be smaller than the refractive index of the transparent base material.
前記光学部材において、前記第一機能層の中心線平均粗さ(Ra)が2~15μmであることが好ましい。
In the optical member, it is preferable that a center line average roughness (Ra) of the first functional layer is 2 to 15 μm.
前記光学部材において、前記第一透明樹脂及び前記第二透明樹脂が、フルオロアルキル基及びフルオロアルキレン基の少なくともいずれかを側鎖に有するアクリル樹脂であることが好ましい。
In the optical member, it is preferable that the first transparent resin and the second transparent resin be an acrylic resin having at least one of a fluoroalkyl group and a fluoroalkylene group in a side chain.
前記光学部材において、前記第一粒子が、球状シリコーン樹脂粒子、酸化ケイ素粒子、多孔質アクリル樹脂粒子の群の中から選ばれるものであることが好ましい。
In the optical member, preferably, the first particles are selected from the group consisting of spherical silicone resin particles, silicon oxide particles, and porous acrylic resin particles.
前記光学部材において、前記第二粒子が、球状ベンゾグアナミン系樹脂粒子であることが好ましい。
In the optical member, the second particles are preferably spherical benzoguanamine resin particles.
前記光学部材において、前記透明基材が、アクリル樹脂及びポリカーボネート樹脂の少なくともいずれかで形成されていることが好ましい。
In the optical member, preferably, the transparent base is formed of at least one of an acrylic resin and a polycarbonate resin.
本発明に係る照明カバーは、前記光学部材を用いて形成されていることを特徴とするものである。
An illumination cover according to the present invention is characterized by being formed using the optical member.
本発明によれば、トレードオフの関係にある光透過性と光拡散性とをバランスよく両立させることができるものである。
According to the present invention, it is possible to balance light transmittance and light diffusion which are in a trade-off relationship in a well-balanced manner.
以下、本発明の実施の形態を説明する。
Hereinafter, embodiments of the present invention will be described.
図1は本発明に係る光学部材3の一例を示すものであり、この光学部材3は、透明基材1の一方の面に第一機能層10を設け、透明基材1の他方の面に第二機能層20を設けて形成されている。そして、この光学部材3は、第一機能層10をLED等の光源2に向けて用いられるものである。
FIG. 1 shows an example of an optical member 3 according to the present invention. This optical member 3 is provided with a first functional layer 10 on one side of a transparent substrate 1 and on the other side of the transparent substrate 1 The second functional layer 20 is provided. The optical member 3 is used with the first functional layer 10 directed to the light source 2 such as an LED.
ここで、透明基材1としては、透明性を有するものであれば特に限定されるものではないが、例えば、アクリル樹脂(アクリル酸エステル又はメタクリル酸エステルの重合体)、ポリカーボネート樹脂、ポリエステル樹脂、スチレン樹脂、ガラス等で形成されたものを用いることができる。中でもアクリル樹脂及びポリカーボネート樹脂は光線透過率が高いので、透明基材1は、アクリル樹脂及びポリカーボネート樹脂の少なくともいずれかで形成されていることが好ましい。透明基材1の厚さは、成形性を考慮すると0.1~3mmであることが好ましいが、第一機能層10と第二機能層20との距離が短い方が光学部材3の光透過性及び光拡散性に好影響を及ぼすので、0.1~2mmであることがより好ましい。透明基材1の透過率は90~100%、ヘーズは0~1%、拡散率は0~1%であることが好ましい。
Here, the transparent substrate 1 is not particularly limited as long as it has transparency, but, for example, acrylic resin (polymer of acrylic ester or methacrylic ester), polycarbonate resin, polyester resin, What was formed with styrene resin, glass, etc. can be used. Among them, since the acrylic resin and the polycarbonate resin have high light transmittance, the transparent substrate 1 is preferably formed of at least one of an acrylic resin and a polycarbonate resin. The thickness of the transparent substrate 1 is preferably 0.1 to 3 mm in consideration of formability, but the shorter the distance between the first functional layer 10 and the second functional layer 20, the better the light transmission of the optical member 3 The thickness is more preferably 0.1 to 2 mm because it has a positive effect on the sex and light diffusion. The transmittance of the transparent substrate 1 is preferably 90 to 100%, the haze is preferably 0 to 1%, and the diffusivity is preferably 0 to 1%.
また第一機能層10は、主として光を取り込んで透過させる機能を有する層であり、次のような第一透明樹脂11及び第一粒子12を含有する。
The first functional layer 10 is a layer mainly having a function of taking in and transmitting light, and contains the following first transparent resin 11 and first particles 12.
すなわち、第一透明樹脂11としては、特に限定されるものではないが、透明基材1との界面で光が全反射しないものを用いることが好ましい。つまり、第一透明樹脂11の屈折率は透明基材1の屈折率よりも小さいことが好ましい。具体的には第一透明樹脂11は、透明性、耐光性、成形性等を考慮すると、アクリル樹脂であることが好ましい。アクリル樹脂としては、特に限定されるものではないが、例えば、メチルメタクリレートの単独重合体、あるいはメチルメタクリレートと、メチルアクリレート、ブチルアクリレート、エチルヘキシルアクリレート等のアクリレート類との共重合体を用いることができる。一般にアクリル樹脂の屈折率は1.49であるが、透明基材1としてアクリル樹脂で形成されたものを用いる場合において、第一透明樹脂11にもアクリル樹脂を用いると、両者の屈折率がほぼ等しくなり、両者の界面で光が全反射するおそれがある。そこで、このような場合には、第一透明樹脂11が、フルオロアルキル基及びフルオロアルキレン基の少なくともいずれかを側鎖に有するアクリル樹脂であることが好ましい。下記式(1)はこのようなアクリル樹脂の繰り返し単位の一例を示すものである。第一透明樹脂11がこのようなアクリル樹脂であれば、透明基材1よりも屈折率を低下させることができるものである。さらにフルオロアルキル基及びフルオロアルキレン基によって、防汚性、撥水性、撥油性を高めることもできるものである。
That is, the first transparent resin 11 is not particularly limited, but it is preferable to use one that does not totally reflect light at the interface with the transparent substrate 1. That is, the refractive index of the first transparent resin 11 is preferably smaller than the refractive index of the transparent substrate 1. Specifically, the first transparent resin 11 is preferably an acrylic resin in consideration of transparency, light resistance, moldability and the like. The acrylic resin is not particularly limited, but, for example, a homopolymer of methyl methacrylate or a copolymer of methyl methacrylate and acrylates such as methyl acrylate, butyl acrylate and ethylhexyl acrylate can be used. . Generally, although the refractive index of acrylic resin is 1.49, when using what was formed with acrylic resin as transparent substrate 1 and using acrylic resin also for the 1st transparent resin 11, both refractive index is almost It becomes equal and there is a possibility that light may be totally reflected at the interface of both. Therefore, in such a case, the first transparent resin 11 is preferably an acrylic resin having at least one of a fluoroalkyl group and a fluoroalkylene group in a side chain. The following formula (1) shows an example of the repeating unit of such an acrylic resin. If the first transparent resin 11 is such an acrylic resin, the refractive index can be reduced compared to the transparent substrate 1. Further, the fluoroalkyl group and the fluoroalkylene group can also enhance antifouling property, water repellency and oil repellency.
上記のように、第一透明樹脂11は熱可塑性樹脂であることが好ましいが、熱硬化性樹脂でもよい。
As described above, the first transparent resin 11 is preferably a thermoplastic resin, but may be a thermosetting resin.
また第一粒子12としては、第一機能層10における光透過性を高めるため、第一透明樹脂11との屈折率の差が0よりも大きく0.07以下であるものを用いる。好ましくは0よりも大きく0.03以下、特に好ましくは0よりも大きく0.01以下である。具体的には第一粒子12は、球状シリコーン樹脂粒子、酸化ケイ素粒子、多孔質アクリル樹脂粒子の群の中から選ばれるものであることが好ましい。通常は第一粒子12の屈折率が高く、第一透明樹脂11の屈折率が低くなるが、両者の屈折率の差が0よりも大きく0.07以下であれば、第一粒子12の屈折率が低く、第一透明樹脂11の屈折率が高くてもよい。
In addition, as the first particles 12, in order to enhance the light transmittance in the first functional layer 10, those having a difference in refractive index with the first transparent resin 11 of more than 0 and not more than 0.07 are used. It is preferably more than 0 and not more than 0.03, and particularly preferably more than 0 and not more than 0.01. Specifically, the first particles 12 are preferably selected from the group consisting of spherical silicone resin particles, silicon oxide particles, and porous acrylic resin particles. Usually, the refractive index of the first particle 12 is high, and the refractive index of the first transparent resin 11 is low. However, if the difference between the refractive indices of the two is greater than 0 and less than or equal to 0.07, the refraction of the first particle 12 is The index may be low and the refractive index of the first transparent resin 11 may be high.
また第一粒子12の平均粒子径は、特に限定されるものではないが、5~15μmであることが好ましい。平均粒子径は、レーザ回折・散乱法によって求めた粒度分布における積算値50%での粒径を意味する。
The average particle size of the first particles 12 is not particularly limited, but is preferably 5 to 15 μm. The average particle size means the particle size at 50% of the integrated value in the particle size distribution determined by the laser diffraction / scattering method.
そして、第一機能層10は、次のようにして形成することができる。まず第一透明樹脂11の固形分100質量部に対して第一粒子12が20~150質量部(好ましくは35~125質量部)となるように、第一透明樹脂11に第一粒子12を分散させ、これをメチルエチルケトン等の溶剤で適宜希釈することによって、第一塗料を調製する。次にこの第一塗料をバーコーター等によって透明基材1の一方の面にコーティングした後、適宜の温度及び時間で乾燥させることによって、第一機能層10を形成することができる。このようにして形成された第一機能層10の光源2側の表面は、第一粒子12により凹凸形状に形成されている。これにより光源2からの光を効率よく取り込むことができるものである。第一機能層10の表面の凹凸形状がさらに均一であれば、光の取り込みが一層良くなるので、第一粒子12の形状は、不定形よりも球状であることが好ましい。
The first functional layer 10 can be formed as follows. First, the first particles 12 are added to the first transparent resin 11 so that the first particles 12 become 20 to 150 parts by mass (preferably 35 to 125 parts by mass) with respect to 100 parts by mass of the solid content of the first transparent resin 11 The first paint is prepared by dispersing and appropriately diluting this with a solvent such as methyl ethyl ketone. Next, the first paint is coated on one surface of the transparent substrate 1 by a bar coater or the like, and then dried at an appropriate temperature and time to form the first functional layer 10. The surface on the light source 2 side of the first functional layer 10 formed in this manner is formed in an uneven shape by the first particles 12. Thereby, the light from the light source 2 can be taken in efficiently. If the asperity shape on the surface of the first functional layer 10 is more uniform, the light uptake is further improved, so the shape of the first particle 12 is preferably spherical rather than amorphous.
また第一機能層10の中心線平均粗さ(Ra)は2~15μmであることが好ましく、4~6μmであることがより好ましい。この場合も光の取り込みが一層良くなるものである。なお、中心線平均粗さ(Ra)は、例えば株式会社キーエンス製「形状測定レーザマイクロスコープVK-8700/9700」等を用いて測定することができる。また第一機能層10の平均厚さは、コストや生産性を考慮すると、5~15μmであることが好ましい。なお、第一機能層10の平均厚さは、例えば、第一機能層10の一部を剥離し、透明基材1を露出させ、株式会社キーエンス製「形状測定レーザマイクロスコープVK-8700/9700」等を用いて、透明基材1と第一透明樹脂11との高低差を10点測定し、その平均値として算出することができる。
The center line average roughness (Ra) of the first functional layer 10 is preferably 2 to 15 μm, and more preferably 4 to 6 μm. Also in this case, the light uptake is further improved. The center line average roughness (Ra) can be measured using, for example, “shape measurement laser microscope VK-8700 / 9700” manufactured by Keyence Corporation. The average thickness of the first functional layer 10 is preferably 5 to 15 μm in consideration of cost and productivity. The average thickness of the first functional layer 10 is, for example, peeling off a portion of the first functional layer 10 to expose the transparent base material 1, “shape measurement laser microscope VK-8700 / 9700” manufactured by Keyence Corporation. The height difference between the transparent base material 1 and the first transparent resin 11 can be measured at 10 points using “etc.”, and can be calculated as an average value thereof.
また第二機能層20は、主として光を拡散させて取り出す機能を有する層であり、次のような第二透明樹脂21及び第二粒子22を含有する。
The second functional layer 20 is a layer mainly having a function of diffusing and extracting light, and contains the following second transparent resin 21 and second particles 22.
すなわち、第二透明樹脂21としては、特に限定されるものではないが、空気の屈折率に近いものを用いることが好ましい。つまり、第二透明樹脂21の屈折率は透明基材1の屈折率よりも小さいことが好ましい。これにより第二機能層20において拡散した光が第二機能層20から空気中に出やすくなる。具体的には第二透明樹脂21は、第一透明樹脂11と同様にアクリル樹脂であることが好ましい。また透明基材1としてアクリル樹脂で形成されたものを用いる場合においても、第一透明樹脂11と同様に第二透明樹脂21も、フルオロアルキル基及びフルオロアルキレン基の少なくともいずれかを側鎖に有するアクリル樹脂であることが好ましい。上記のように、第二透明樹脂21は熱可塑性樹脂であることが好ましいが、熱硬化性樹脂でもよい。
That is, the second transparent resin 21 is not particularly limited, but it is preferable to use one having a refractive index close to that of air. That is, the refractive index of the second transparent resin 21 is preferably smaller than the refractive index of the transparent substrate 1. Thus, the light diffused in the second functional layer 20 can be easily emitted from the second functional layer 20 into the air. Specifically, like the first transparent resin 11, the second transparent resin 21 is preferably an acrylic resin. Further, also in the case of using the one formed of an acrylic resin as the transparent substrate 1, the second transparent resin 21 also has at least one of a fluoroalkyl group and a fluoroalkylene group in the side chain similarly to the first transparent resin 11. It is preferable that it is an acrylic resin. As described above, the second transparent resin 21 is preferably a thermoplastic resin, but may be a thermosetting resin.
また第二粒子22としては、第二機能層20における拡散性を高めるため、第二透明樹脂21との屈折率の差が0.10~0.25であるものを用いる。好ましくは0.15~0.25である。具体的には第二粒子22は、球状ベンゾグアナミン系樹脂粒子であることが好ましい。通常は第二粒子22の屈折率が高く、第二透明樹脂21の屈折率が低くなるが、両者の屈折率の差が0.10~0.25であれば、第二粒子22の屈折率が低く、第二透明樹脂21の屈折率が高くてもよい。しかし、両者の屈折率の差が0.10よりも小さいと拡散性を高めることができず、両者の屈折率の差が0.25よりも大きいと拡散性はほぼ頭打ちになり、透過率のみが低下する傾向がある。
Further, as the second particles 22, in order to enhance the diffusibility in the second functional layer 20, those having a difference in refractive index with the second transparent resin 21 of 0.10 to 0.25 are used. Preferably, it is 0.15 to 0.25. Specifically, the second particles 22 are preferably spherical benzoguanamine resin particles. Usually, the refractive index of the second particle 22 is high, and the refractive index of the second transparent resin 21 is low. However, if the difference between the refractive indices of the two is 0.10 to 0.25, the refractive index of the second particle 22 And the refractive index of the second transparent resin 21 may be high. However, if the difference between the two refractive indices is less than 0.10, the diffusivity can not be enhanced, and if the difference between the two refractive indices is greater than 0.25, the diffusivity almost plateaus, and only the transmittance Tend to decrease.
また第二粒子22の平均粒子径は、0.8~5μmであることが好ましく、1~3μmであることがより好ましい。
The average particle diameter of the second particles 22 is preferably 0.8 to 5 μm, and more preferably 1 to 3 μm.
そして、第二機能層20は、次のようにして形成することができる。まず第二透明樹脂21の固形分100質量部に対して第二粒子22が20~150質量部(好ましくは25~125質量部)となるように、第二透明樹脂21に第二粒子22を分散させ、これをメチルエチルケトン等の溶剤で適宜希釈することによって、第二塗料を調製する。次にこの第二塗料をバーコーター等によって透明基材1の他方の面にコーティングした後、適宜の温度及び時間で乾燥させることによって、第二機能層20を形成することができる。
The second functional layer 20 can be formed as follows. First, the second particles 22 are added to the second transparent resin 21 so that the second particles 22 become 20 to 150 parts by mass (preferably 25 to 125 parts by mass) with respect to 100 parts by mass of the solid content of the second transparent resin 21 The second paint is prepared by dispersing and appropriately diluting this with a solvent such as methyl ethyl ketone. Next, the second paint is coated on the other surface of the transparent substrate 1 by a bar coater or the like, and then dried at an appropriate temperature and time to form the second functional layer 20.
また第二機能層20の中心線平均粗さ(Ra)は0.1~4μmであることが好ましい。また第二機能層20の平均厚さは、コストや生産性を考慮すると、5~15μmであることが好ましい。なお、第二機能層20の平均厚さは、例えば、第二機能層20の一部を剥離し、透明基材1を露出させ、株式会社キーエンス製「形状測定レーザマイクロスコープVK-8700/9700」等を用いて、透明基材1と第二透明樹脂21との高低差を10点測定し、その平均値として算出することができる。
The center line average roughness (Ra) of the second functional layer 20 is preferably 0.1 to 4 μm. The average thickness of the second functional layer 20 is preferably 5 to 15 μm in consideration of cost and productivity. The average thickness of the second functional layer 20 is, for example, peeling off a part of the second functional layer 20 to expose the transparent substrate 1, “shape measurement laser microscope VK-8700 / 9700” manufactured by Keyence Corporation. The height difference between the transparent base material 1 and the second transparent resin 21 can be measured at 10 points using “etc.” and calculated as an average value thereof.
光学部材3を製造するにあたっては、透明基材1に第一機能層10を設けた後に第二機能層20を設けてもよいし、透明基材1に第二機能層20を設けた後に第一機能層10を設けてもよいし、透明基材1に第一機能層10及び第二機能層20を同時に設けてもよい。
When manufacturing the optical member 3, the second functional layer 20 may be provided after the first functional layer 10 is provided on the transparent substrate 1, or the second functional layer 20 may be provided on the transparent substrate 1. One functional layer 10 may be provided, or the first functional layer 10 and the second functional layer 20 may be provided simultaneously on the transparent substrate 1.
上記のようにして形成された光学部材3は、透明基材1の両面にそれぞれ機能の異なる第一機能層10及び第二機能層20を有する。すなわち、第一機能層10は、光源2側に位置し、主として光透過性を向上させるものであり、第二機能層20は、光源2と反対側に位置し、主として光拡散性を向上させるものである。このように、第一機能層10が光源2側に位置することによって、第一機能層10がない場合(図3参照)よりも光源2から光を取り込みやすくすることができる。さらに第一機能層10のみでヘーズを高くすることができるため、高光透過性及び高ヘーズとなり、ランプイメージを消すには至らないが、第一機能層10には幾分か光拡散性もある。すなわち、第一機能層10によって光源2の光を多く取り込みながら、光源2から出る光の指向性を広げることが可能である。このように光源2のもつ指向特性を変換し、第二機能層20へ光を入射させることで、より入射角の大きい光が照射されるため、第一機能層10がない場合(図3参照)に比べて光拡散性も向上する。したがって、第一機能層10により透過率を上昇させ、第一機能層10及び第二機能層20の相乗効果により拡散率を上昇させることができ、トレードオフの関係にある光透過性と光拡散性とをバランスよく両立させることができるものである。しかも第一透明樹脂11及び第二透明樹脂21の屈折率が透明基材1の屈折率よりも小さいと、光源2からの光を取り込みやすくすることができると共に、取り込んだ光を取り出しやすくすることもできるものである。
The optical member 3 formed as described above has the first functional layer 10 and the second functional layer 20 having different functions on both surfaces of the transparent substrate 1. That is, the first functional layer 10 is located on the light source 2 side to improve mainly the light transmittance, and the second functional layer 20 is located on the opposite side to the light source 2 to mainly improve the light diffusivity. It is a thing. Thus, by positioning the first functional layer 10 on the light source 2 side, it is possible to make it easier to take in light from the light source 2 than when there is no first functional layer 10 (see FIG. 3). Furthermore, high haze can be achieved only with the first functional layer 10, resulting in high light transmittance and high haze, and although the lamp image can not be erased, the first functional layer 10 also has some light diffusion. . That is, it is possible to broaden the directivity of the light emitted from the light source 2 while taking in much light of the light source 2 by the first functional layer 10. As described above, when the directivity characteristic of the light source 2 is converted and light is made incident on the second functional layer 20, light having a larger incident angle is irradiated, so that the first functional layer 10 is not present (see FIG. 3). Light diffusivity is also improved compared to. Therefore, the transmittance can be increased by the first functional layer 10, and the diffusivity can be increased by the synergistic effect of the first functional layer 10 and the second functional layer 20, and the light transmittance and the light diffusion are in a trade-off relationship. It is possible to achieve a balance between sexuality and well-being. Moreover, when the refractive index of the first transparent resin 11 and the second transparent resin 21 is smaller than the refractive index of the transparent substrate 1, light from the light source 2 can be easily taken in, and the taken light can be easily taken out. It is also possible.
本発明に係る照明カバー4は、上記の光学部材3を用いて形成することができる。光学部材3は平板状のまま照明カバー4として用いてもよいが、光源2の形状等に応じて所定形状に成形したものを照明カバー4として用いてもよい。光学部材3を所定形状に成形する場合、第一透明樹脂11及び第二透明樹脂21が熱硬化性樹脂であると、第一機能層10又は第二機能層20にクラックが発生するおそれがあるので、この場合には第一透明樹脂11及び第二透明樹脂21は熱可塑性樹脂であることが好ましい。
The illumination cover 4 according to the present invention can be formed using the above-described optical member 3. The optical member 3 may be used as the illumination cover 4 as it is in the form of a flat plate, but may be used as the illumination cover 4 in a predetermined shape according to the shape of the light source 2 or the like. When the optical member 3 is formed into a predetermined shape, if the first transparent resin 11 and the second transparent resin 21 are thermosetting resin, there is a possibility that a crack may occur in the first functional layer 10 or the second functional layer 20 Therefore, in this case, the first transparent resin 11 and the second transparent resin 21 are preferably thermoplastic resins.
以下、本発明を実施例によって具体的に説明する。
Hereinafter, the present invention will be specifically described by way of examples.
(実施例1)
透明基材1として、アクリル樹脂で形成されたアクリル板(50mm×70mm×厚さ2mm、屈折率1.49、透過率92.5%、ヘーズ0.2%、拡散率0%)を用いた。 Example 1
An acrylic plate (50 mm × 70 mm ×thickness 2 mm, refractive index 1.49, transmittance 92.5%, haze 0.2%, diffusion rate 0%) formed of acrylic resin was used as the transparent substrate 1 .
透明基材1として、アクリル樹脂で形成されたアクリル板(50mm×70mm×厚さ2mm、屈折率1.49、透過率92.5%、ヘーズ0.2%、拡散率0%)を用いた。 Example 1
An acrylic plate (50 mm × 70 mm ×
また第一透明樹脂11及び第二透明樹脂21として、フルオロアルキル基及びフルオロアルキレン基の少なくともいずれかを側鎖に有するアクリル樹脂である関東電化工業株式会社製「N3818」(屈折率1.42)を用いた。
In addition, “N 3818” (refractive index: 1.42) manufactured by Kanto Denka Kogyo Co., Ltd., which is an acrylic resin having at least one of a fluoroalkyl group and a fluoroalkylene group in the side chain as the first transparent resin 11 and the second transparent resin 21 Was used.
また第一粒子12として、球状シリコーン樹脂粒子であるモメンティブ・パフォーマンス・マテリアルズ・ジャパン合同会社製「トスパール1110」(屈折率1.42、平均粒子径11μm)を用いた。
Further, as the first particles 12, “Tospearl 1110” (refractive index: 1.42, average particle diameter: 11 μm) manufactured by Momentive Performance Materials Japan Ltd., which is spherical silicone resin particles, was used.
また第二粒子22として、球状ベンゾグアナミン系樹脂粒子である株式会社日本触媒製「エポスターMS」(ベンゾグアナミンホルムアルデヒド縮合物、屈折率1.66、平均粒子径1~3μm)を用いた。
In addition, as the second particles 22, spherical benzoguanamine-based resin particles “Epostor MS” (benzoguanamine formaldehyde condensate, refractive index 1.66, average particle diameter 1 to 3 μm) manufactured by Nippon Shokubai Co., Ltd. were used.
そして、第一機能層10は、次のようにして形成した。まず第一透明樹脂11の固形分100質量部に対して第一粒子12が100質量部となるように、第一透明樹脂11に第一粒子12を分散させ、これを不揮発分が26質量%となるようにメチルエチルケトンで希釈することによって、第一塗料を調製した。次にこの第一塗料をバーコーター(#40)によって透明基材1の一方の面にコーティングした後、80℃で10分間乾燥させることによって、第一機能層10を形成した。第一機能層10の中心線平均粗さ(Ra)は5.2μmであり、第一機能層10の平均厚さは約7~8μmであった。
The first functional layer 10 was formed as follows. First, the first particles 12 are dispersed in the first transparent resin 11 so that the first particles 12 become 100 parts by mass with respect to 100 parts by mass of the solid content of the first transparent resin 11, and the non-volatile matter is 26% by mass The first paint was prepared by diluting with methyl ethyl ketone so that Next, the first paint was coated on one side of the transparent substrate 1 by a bar coater (# 40), and dried at 80 ° C. for 10 minutes to form a first functional layer 10. The center line average roughness (Ra) of the first functional layer 10 was 5.2 μm, and the average thickness of the first functional layer 10 was about 7 to 8 μm.
また第二機能層20は、次のようにして形成した。まず第二透明樹脂21の固形分100質量部に対して第二粒子22が100質量部となるように、第二透明樹脂21に第二粒子22を分散させ、これを不揮発分が26質量%となるようにメチルエチルケトンで希釈することによって、第二塗料を調製した。次にこの第二塗料をバーコーター(#40)によって透明基材1の他方の面にコーティングした後、80℃で10分間乾燥させることによって、第二機能層20を形成した。第二機能層20の中心線平均粗さ(Ra)は1.5μmであり、第二機能層10の平均厚さは約10μmであった。
The second functional layer 20 was formed as follows. First, the second particles 22 are dispersed in the second transparent resin 21 so that the second particles 22 become 100 parts by mass with respect to 100 parts by mass of the solid content of the second transparent resin 21. A second paint was prepared by diluting with methyl ethyl ketone so that Next, the second paint was coated on the other side of the transparent substrate 1 by a bar coater (# 40), and dried at 80 ° C. for 10 minutes to form a second functional layer 20. The center line average roughness (Ra) of the second functional layer 20 was 1.5 μm, and the average thickness of the second functional layer 10 was about 10 μm.
上記のようにして、図1に示すような光学部材3を製造した。
As described above, an optical member 3 as shown in FIG. 1 was manufactured.
(実施例2)
透明基材1として、実施例1と同様のものを用いた。 (Example 2)
The sametransparent substrate 1 as in Example 1 was used.
透明基材1として、実施例1と同様のものを用いた。 (Example 2)
The same
そして、第一機能層10は、実施例1と同様にして形成した。
The first functional layer 10 was formed in the same manner as in Example 1.
また第二機能層20は、次のようにして形成した。まず第二透明樹脂21の固形分100質量部に対して第二粒子22が33質量部となるように、第二透明樹脂21に第二粒子22を分散させ、これを不揮発分が19質量%となるようにメチルエチルケトンで希釈することによって、第二塗料を調製した。次にこの第二塗料をバーコーター(#40)によって透明基材1の他方の面にコーティングした後、80℃で10分間乾燥させることによって、第二機能層20を形成した。第二機能層20の中心線平均粗さ(Ra)は1.3μmであり、第二機能層10の平均厚さは約9μmであった。
The second functional layer 20 was formed as follows. First, the second particles 22 are dispersed in the second transparent resin 21 so that the second particles 22 become 33 parts by mass with respect to 100 parts by mass of the solid content of the second transparent resin 21. A second paint was prepared by diluting with methyl ethyl ketone so that Next, the second paint was coated on the other side of the transparent substrate 1 by a bar coater (# 40), and dried at 80 ° C. for 10 minutes to form a second functional layer 20. The center line average roughness (Ra) of the second functional layer 20 was 1.3 μm, and the average thickness of the second functional layer 10 was about 9 μm.
上記のようにして、図1に示すような光学部材3を製造した。
As described above, an optical member 3 as shown in FIG. 1 was manufactured.
(実施例3)
透明基材1として、実施例1と同様のものを用いた。 (Example 3)
The sametransparent substrate 1 as in Example 1 was used.
透明基材1として、実施例1と同様のものを用いた。 (Example 3)
The same
また第一透明樹脂11及び第二透明樹脂21として、実施例1と同様のものを用いた。
Further, as the first transparent resin 11 and the second transparent resin 21, the same ones as in Example 1 were used.
また第一粒子12として、多孔質アクリル樹脂粒子である積水化成品工業株式会社製「MBP-8」(架橋ポリメタクリル酸メチルの多孔質球状微粒子、屈折率1.49、平均粒子径8μm)を用いた。
Further, as the first particles 12, “MBP-8” (porous spherical fine particles of crosslinked polymethyl methacrylate, refractive index 1.49, average particle diameter 8 μm) manufactured by Sekisui Chemical Co., Ltd., which is porous acrylic resin particles Using.
また第二粒子22として、実施例1と同様のものを用いた。
Also, as the second particles 22, the same particles as in Example 1 were used.
そして、第一機能層10は、次のようにして形成した。まず第一透明樹脂11の固形分100質量部に対して第一粒子12が54質量部となるように、第一透明樹脂11に第一粒子12を分散させ、これを不揮発分が21質量%となるようにメチルエチルケトンで希釈することによって、第一塗料を調製した。次にこの第一塗料をバーコーター(#40)によって透明基材1の一方の面にコーティングした後、80℃で10分間乾燥させることによって、第一機能層10を形成した。第一機能層10の中心線平均粗さ(Ra)は4.6μmであり、第一機能層10の平均厚さは9μmであった。
The first functional layer 10 was formed as follows. First, the first particles 12 are dispersed in the first transparent resin 11 so that the first particles 12 become 54 parts by mass with respect to 100 parts by mass of the solid content of the first transparent resin 11, and the non-volatile matter is 21% by mass The first paint was prepared by diluting with methyl ethyl ketone so that Next, the first paint was coated on one side of the transparent substrate 1 by a bar coater (# 40), and dried at 80 ° C. for 10 minutes to form a first functional layer 10. The center line average roughness (Ra) of the first functional layer 10 was 4.6 μm, and the average thickness of the first functional layer 10 was 9 μm.
また第二機能層20は、次のようにして形成した。まず第二透明樹脂21の固形分100質量部に対して第二粒子22が54質量部となるように、第二透明樹脂21に第二粒子22を分散させ、これを不揮発分が21質量%となるようにメチルエチルケトンで希釈することによって、第二塗料を調製した。次にこの第二塗料をバーコーター(#40)によって透明基材1の他方の面にコーティングした後、80℃で10分間乾燥させることによって、第二機能層20を形成した。第二機能層20の中心線平均粗さ(Ra)は1.4μmであり、第二機能層10の平均厚さは9.6μmであった。
The second functional layer 20 was formed as follows. First, the second particles 22 are dispersed in the second transparent resin 21 so that the second particles 22 are 54 parts by mass with respect to 100 parts by mass of the solid content of the second transparent resin 21. A second paint was prepared by diluting with methyl ethyl ketone so that Next, the second paint was coated on the other side of the transparent substrate 1 by a bar coater (# 40), and dried at 80 ° C. for 10 minutes to form a second functional layer 20. The center line average roughness (Ra) of the second functional layer 20 was 1.4 μm, and the average thickness of the second functional layer 10 was 9.6 μm.
上記のようにして、図1に示すような光学部材3を製造した。
As described above, an optical member 3 as shown in FIG. 1 was manufactured.
(比較例1)
実施例1において、透明基材1の一方の面に第一機能層10のみを設け、透明基材1の他方の面に第二機能層20を設けないことによって、図2に示すような光学部材3を製造した。 (Comparative example 1)
In Example 1, by providing only the firstfunctional layer 10 on one surface of the transparent substrate 1 and not providing the second functional layer 20 on the other surface of the transparent substrate 1, optical as shown in FIG. The member 3 was manufactured.
実施例1において、透明基材1の一方の面に第一機能層10のみを設け、透明基材1の他方の面に第二機能層20を設けないことによって、図2に示すような光学部材3を製造した。 (Comparative example 1)
In Example 1, by providing only the first
(比較例2)
実施例1において、透明基材1の一方の面に第一機能層10を設けず、透明基材1の他方の面に第二機能層20のみを設けることによって、図3に示すような光学部材3を製造した。 (Comparative example 2)
In Example 1, by providing only the secondfunctional layer 20 on the other surface of the transparent substrate 1 without providing the first functional layer 10 on one surface of the transparent substrate 1, optical as shown in FIG. The member 3 was manufactured.
実施例1において、透明基材1の一方の面に第一機能層10を設けず、透明基材1の他方の面に第二機能層20のみを設けることによって、図3に示すような光学部材3を製造した。 (Comparative example 2)
In Example 1, by providing only the second
(比較例3)
実施例2において、透明基材1の一方の面に第一機能層10を設けず、透明基材1の他方の面に第二機能層20のみを設けることによって、図3に示すような光学部材3を製造した。 (Comparative example 3)
In Example 2, by providing only the secondfunctional layer 20 on the other surface of the transparent substrate 1 without providing the first functional layer 10 on one surface of the transparent substrate 1, optical as shown in FIG. The member 3 was manufactured.
実施例2において、透明基材1の一方の面に第一機能層10を設けず、透明基材1の他方の面に第二機能層20のみを設けることによって、図3に示すような光学部材3を製造した。 (Comparative example 3)
In Example 2, by providing only the second
(比較例4)
実施例3において、透明基材1の一方の面に第一機能層10のみを設け、透明基材1の他方の面に第二機能層20を設けないことによって、図2に示すような光学部材3を製造した。 (Comparative example 4)
In Example 3, by providing only the firstfunctional layer 10 on one surface of the transparent substrate 1 and not providing the second functional layer 20 on the other surface of the transparent substrate 1, the optical as shown in FIG. The member 3 was manufactured.
実施例3において、透明基材1の一方の面に第一機能層10のみを設け、透明基材1の他方の面に第二機能層20を設けないことによって、図2に示すような光学部材3を製造した。 (Comparative example 4)
In Example 3, by providing only the first
(比較例5)
実施例3において、透明基材1の一方の面に第一機能層10を設けず、透明基材1の他方の面に第二機能層20のみを設けることによって、図3に示すような光学部材3を製造した。 (Comparative example 5)
In Example 3, by providing only the secondfunctional layer 20 on the other surface of the transparent substrate 1 without providing the first functional layer 10 on one surface of the transparent substrate 1, optical as shown in FIG. The member 3 was manufactured.
実施例3において、透明基材1の一方の面に第一機能層10を設けず、透明基材1の他方の面に第二機能層20のみを設けることによって、図3に示すような光学部材3を製造した。 (Comparative example 5)
In Example 3, by providing only the second
(比較例6)
光学部材3として、図4に示すように、厚さ100μmの透明PETフィルムからなるフィルム基材31の両面に厚さ12.5μmの光拡散層32を設けて形成された拡散フィルム30(株式会社きもと製「100PBU」)を用いた。 (Comparative example 6)
As theoptical member 3, as shown in FIG. 4, a diffusion film 30 formed by providing a light diffusion layer 32 with a thickness of 12.5 μm on both sides of a film base 31 made of a transparent PET film with a thickness of 100 μm Kimoto-made "100 PBU" was used.
光学部材3として、図4に示すように、厚さ100μmの透明PETフィルムからなるフィルム基材31の両面に厚さ12.5μmの光拡散層32を設けて形成された拡散フィルム30(株式会社きもと製「100PBU」)を用いた。 (Comparative example 6)
As the
(比較例7)
光学部材3として、図5に示すように、樹脂41に拡散剤42を練り込んで製造された厚さ2mmのポリカーボネートシート40(旭硝子株式会社製「ライトオパール」)を用いた。 (Comparative example 7)
As theoptical member 3, as shown in FIG. 5, a polycarbonate sheet 40 with a thickness of 2 mm (“Light Opal” manufactured by Asahi Glass Co., Ltd.) manufactured by kneading a diffusing agent 42 in a resin 41 was used.
光学部材3として、図5に示すように、樹脂41に拡散剤42を練り込んで製造された厚さ2mmのポリカーボネートシート40(旭硝子株式会社製「ライトオパール」)を用いた。 (Comparative example 7)
As the
(評価)
(ヘーズ及び透過率)
ヘーズメーター(日本電色工業株式会社製「NDH2000」)を用いて各光学部材3のヘーズ及び透過率(全光線透過率)を測定した。 (Evaluation)
(Haze and transmittance)
The haze and the transmittance (total light transmittance) of eachoptical member 3 were measured using a haze meter ("NDH 2000" manufactured by Nippon Denshoku Industries Co., Ltd.).
(ヘーズ及び透過率)
ヘーズメーター(日本電色工業株式会社製「NDH2000」)を用いて各光学部材3のヘーズ及び透過率(全光線透過率)を測定した。 (Evaluation)
(Haze and transmittance)
The haze and the transmittance (total light transmittance) of each
(拡散率)
光学部材3の第二機能層20の表面を透過面として、出射角θr(±5°,±20°,±70°)方向の輝度L(θr)を測定し、測定値を下記式(2)に代入することより、各光学部材3の拡散率を算出した。 (Diffusion rate)
With the surface of the secondfunctional layer 20 of the optical member 3 as the transmission surface, the luminance L (θ r ) in the direction of the emission angle θ r (± 5 °, ± 20 °, ± 70 °) is measured, The diffusivity of each optical member 3 was calculated by substituting for (2).
光学部材3の第二機能層20の表面を透過面として、出射角θr(±5°,±20°,±70°)方向の輝度L(θr)を測定し、測定値を下記式(2)に代入することより、各光学部材3の拡散率を算出した。 (Diffusion rate)
With the surface of the second
(結果)
実施例1~3及び比較例1~7の光学部材3のヘーズ、透過率、拡散率を表1に示し、透過率に対して拡散率をプロットしたグラフを図6に示す。図6において、Aは実施例1~3のデータから最小二乗法により得られた直線であり、Bは比較例1~7のデータから最小二乗法により得られた直線である。 (result)
The haze, the transmittance, and the diffusivity of theoptical members 3 of Examples 1 to 3 and Comparative Examples 1 to 7 are shown in Table 1, and a graph in which the diffusivity is plotted against the transmittance is shown in FIG. In FIG. 6, A is a straight line obtained by the least squares method from the data of Examples 1 to 3, and B is a straight line obtained by the least squares method from the data of Comparative Examples 1 to 7.
実施例1~3及び比較例1~7の光学部材3のヘーズ、透過率、拡散率を表1に示し、透過率に対して拡散率をプロットしたグラフを図6に示す。図6において、Aは実施例1~3のデータから最小二乗法により得られた直線であり、Bは比較例1~7のデータから最小二乗法により得られた直線である。 (result)
The haze, the transmittance, and the diffusivity of the
実施例1と比較例1とを対比すると、比較例1では光学部材3を透して光源2のランプイメージが視認されやすいのに対し、実施例1ではランプイメージが視認されにくいことが分かった。
When Example 1 and Comparative Example 1 are compared, it was found that in Comparative Example 1, the lamp image of the light source 2 is easily visible through the optical member 3, whereas in Example 1 the lamp image is hard to be viewed. .
また実施例1と比較例2とを対比すると、比較例2に比べて実施例1の方が透過性及び光拡散性が共に高められていることが分かった。
Moreover, when Example 1 and Comparative Example 2 were compared, it turned out that the transparency and light diffusivity of Example 1 are both enhanced as compared with Comparative Example 2.
また実施例2と比較例3とを対比すると、比較例3に比べて実施例2の方が透過性及び光拡散性が共に高められていることが分かった。
Moreover, when Example 2 and Comparative Example 3 were compared, it turned out that the transparency and light diffusivity of Example 2 are both enhanced as compared with Comparative Example 3.
また実施例3と比較例4とを対比すると、比較例4では光学部材3を透して光源2のランプイメージが視認されやすいのに対し、実施例3ではランプイメージが視認されにくいことが分かった。
Further, when Example 3 and Comparative Example 4 are compared, it is understood that in Comparative Example 4, the lamp image of the light source 2 is easy to be seen through the optical member 3 while in Example 3 the lamp image is hard to be recognized. The
また実施例3と比較例5とを対比すると、比較例5に比べて実施例3の方が透過性及び光拡散性が共に高められていることが分かった。
Moreover, when Example 3 and Comparative Example 5 were compared, it turned out that Example 3 has both transparency and light diffusivity improved compared with Comparative Example 5.
また実施例1~3と比較例6、7とを対比すると、図6に示すように、実施例1~3はいずれも直線Bの右上の領域に位置することが分かった。
Further, when Examples 1 to 3 and Comparative Examples 6 and 7 are compared, it is found that Examples 1 to 3 are all located in the upper right region of the straight line B, as shown in FIG.
上記のように実施例1~3では、トレードオフの関係にある光透過性と光拡散性とをバランスよく両立させることができることが確認された。
As described above, in Examples 1 to 3, it has been confirmed that the light transmittance and the light diffusivity, which are in a trade-off relationship, can be balanced in a well-balanced manner.
1 透明基材
2 光源
3 光学部材
4 照明カバー
10 第一機能層
11 第一透明樹脂
12 第一粒子
20 第二機能層
21 第二透明樹脂
22 第二粒子 DESCRIPTION OFSYMBOLS 1 Transparent base 2 Light source 3 Optical member 4 Lighting cover 10 1st functional layer 11 1st transparent resin 12 1st particle 20 2nd functional layer 21 2nd transparent resin 22 2nd particle
2 光源
3 光学部材
4 照明カバー
10 第一機能層
11 第一透明樹脂
12 第一粒子
20 第二機能層
21 第二透明樹脂
22 第二粒子 DESCRIPTION OF
Claims (9)
- 透明基材の一方の面に第一機能層を設け、前記透明基材の他方の面に第二機能層を設けて形成され、前記第一機能層を光源に向けて用いられる光学部材であって、前記第一機能層が第一透明樹脂及び第一粒子を含有し、前記第一透明樹脂と前記第一粒子との屈折率の差が0よりも大きく0.07以下であり、前記第一機能層の前記光源側の表面が前記第一粒子により凹凸形状に形成され、前記第二機能層が第二透明樹脂及び第二粒子を含有し、前記第二透明樹脂と前記第二粒子との屈折率の差が0.10~0.25であることを特徴とする光学部材。 An optical member formed by providing a first functional layer on one surface of a transparent substrate and providing a second functional layer on the other surface of the transparent substrate, the first functional layer being directed to a light source The first functional layer contains the first transparent resin and the first particles, and the difference in refractive index between the first transparent resin and the first particles is more than 0 and not more than 0.07, The surface on the light source side of one functional layer is formed in a concavo-convex shape by the first particles, the second functional layer contains a second transparent resin and a second particle, and the second transparent resin and the second particles An optical member having a refractive index difference of 0.10 to 0.25.
- 前記第二粒子の平均粒子径が0.8~5μmであることを特徴とする請求項1に記載の光学部材。 The optical member according to claim 1, wherein an average particle diameter of the second particles is 0.8 to 5 μm.
- 前記第一透明樹脂及び前記第二透明樹脂の屈折率が前記透明基材の屈折率よりも小さいことを特徴とする請求項1又は2に記載の光学部材。 The optical member according to claim 1 or 2, wherein the refractive index of the first transparent resin and the second transparent resin is smaller than the refractive index of the transparent base material.
- 前記第一機能層の中心線平均粗さ(Ra)が2~15μmであることを特徴とする請求項1乃至3のいずれか一項に記載の光学部材。 The optical member according to any one of claims 1 to 3, wherein a center line average roughness (Ra) of the first functional layer is 2 to 15 μm.
- 前記第一透明樹脂及び前記第二透明樹脂が、フルオロアルキル基及びフルオロアルキレン基の少なくともいずれかを側鎖に有するアクリル樹脂であることを特徴とする請求項1乃至4のいずれか一項に記載の光学部材。 The first transparent resin and the second transparent resin are acrylic resins having at least one of a fluoroalkyl group and a fluoroalkylene group in a side chain thereof. Optical members.
- 前記第一粒子が、球状シリコーン樹脂粒子、酸化ケイ素粒子、多孔質アクリル樹脂粒子の群の中から選ばれるものであることを特徴とする請求項1乃至5のいずれか一項に記載の光学部材。 The optical member according to any one of claims 1 to 5, wherein the first particles are selected from the group consisting of spherical silicone resin particles, silicon oxide particles, and porous acrylic resin particles. .
- 前記第二粒子が、球状ベンゾグアナミン系樹脂粒子であることを特徴とする請求項1乃至6のいずれか一項に記載の光学部材。 The optical member according to any one of claims 1 to 6, wherein the second particles are spherical benzoguanamine resin particles.
- 前記透明基材が、アクリル樹脂及びポリカーボネート樹脂の少なくともいずれかで形成されていることを特徴とする請求項1乃至7のいずれか一項に記載の光学部材。 The optical member according to any one of claims 1 to 7, wherein the transparent base material is formed of at least one of an acrylic resin and a polycarbonate resin.
- 請求項1乃至8のいずれか一項に記載の光学部材を用いて形成されていることを特徴とする照明カバー。 An illumination cover comprising the optical member according to any one of claims 1 to 8.
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JP2014540749A JP6021029B2 (en) | 2012-10-12 | 2013-10-10 | Optical member, lighting cover and lighting fixture |
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JP2015232678A (en) * | 2014-05-12 | 2015-12-24 | パナソニックIpマネジメント株式会社 | Functional resin molded article and illumination cover |
JP2015220132A (en) * | 2014-05-19 | 2015-12-07 | 三菱電機株式会社 | Diffusion cover, lighting lamp, lighting device, and manufacturing method of diffusion cover |
JP5843024B1 (en) * | 2014-08-22 | 2016-01-13 | 大日本印刷株式会社 | Display device |
US9541682B2 (en) | 2014-08-22 | 2017-01-10 | Dai Nippon Printing Co., Ltd. | Display device |
JP2016100055A (en) * | 2014-11-18 | 2016-05-30 | パナソニックIpマネジメント株式会社 | Luminaire |
JP2017062990A (en) * | 2015-09-25 | 2017-03-30 | 三菱電機株式会社 | Diffusion cover, illumination lamp, illumination device, and method for producing diffusion cover |
JP2017062996A (en) * | 2015-09-25 | 2017-03-30 | 三菱電機株式会社 | Diffusion cover, illumination lamp, illumination device, and method for producing diffusion cover |
JP2017181528A (en) * | 2016-03-28 | 2017-10-05 | パナソニックIpマネジメント株式会社 | Light diffusion plate and lighting fixture |
Also Published As
Publication number | Publication date |
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CN104583818B (en) | 2017-09-12 |
CN104583818A (en) | 2015-04-29 |
JP6021029B2 (en) | 2016-11-02 |
JPWO2014057680A1 (en) | 2016-09-05 |
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