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WO2025069524A1 - Filtre optique, procédé de fabrication de filtre optique, module optique et filtre optique pour transfert - Google Patents

Filtre optique, procédé de fabrication de filtre optique, module optique et filtre optique pour transfert Download PDF

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Publication number
WO2025069524A1
WO2025069524A1 PCT/JP2024/015046 JP2024015046W WO2025069524A1 WO 2025069524 A1 WO2025069524 A1 WO 2025069524A1 JP 2024015046 W JP2024015046 W JP 2024015046W WO 2025069524 A1 WO2025069524 A1 WO 2025069524A1
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Prior art keywords
optical filter
infrared
transmitting layer
filter according
matrix
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English (en)
Japanese (ja)
Inventor
雄大 沼田
杏子 湯浅
祥一 松田
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Nitto Denko Corp
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Nitto Denko Corp
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Publication of WO2025069524A1 publication Critical patent/WO2025069524A1/fr
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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters

Definitions

  • the present invention relates to an optical filter, a method for manufacturing an optical filter, an optical module, and an optical filter for transfer.
  • Patent Document 1 discloses an optical member having a reflective scattering section that reflects and scatters light in at least a part of the visible wavelength band and transmits light in at least a part of the infrared wavelength band, and has a rectilinear transmittance of 75% or more for light in at least the part of the infrared wavelength band.
  • Patent Document 2 discloses an optical product for infrared communication that uses Rayleigh scattering due to a fine uneven shape formed by roughening the surface of a transparent substrate to scatter visible light, thereby presenting a white color, and has an infrared transmittance of 12% or more.
  • Patent Document 3 discloses an optical product for infrared communication that uses Rayleigh scattering to scatter visible light, thereby presenting a white color, and has an infrared transmittance of 12% or more, by uniformly dispersing fine particles having a different refractive index from that of a binder resin transparent in the infrared wavelength range.
  • Patent Documents 4 and 5 disclose a system including a wavelength-selective scattering layer in an optical filter adjacent to one or both of the light emitter and the light receiver, the ratio of average near-infrared scattering to average visible scattering being less than 0.9 and the ratio of average visible diffuse reflectance to average visible total reflectance being greater than 0.5.
  • Patent Document 6 discloses an optical filter having an average visible transmittance of less than 30% for wavelengths between 400 nm and 700 nm and an average near-infrared transmittance of greater than 30% for wavelengths between 830 nm and 900 nm.
  • Patent Document 1 uses Rayleigh scattering due to the minute unevenness of the surface to scatter visible light, resulting in a white color.
  • this effect is not achieved when the component is used on a curved surface, and there is a problem in that the component cannot produce a white color when formed into the desired shape.
  • the present invention aims to solve the above-mentioned problems of the conventional art and provide an optical filter that has high whiteness, can scatter and reflect visible light, and has excellent linear transmittance of near-infrared light.
  • One embodiment of the present invention is an optical filter having a near-infrared transmitting layer having a moisture content change rate calculated by the following formula (1) of less than 1.09%.
  • Moisture content change rate (%) (B - A)
  • a x 100 Formula (1) “A” represents the mass of sample a obtained by leaving the near-infrared transmitting layer under a reduced pressure of 0.1 MPa for 24 hours using a vacuum dryer set at 80°C, and "B” represents the mass of sample b obtained by leaving the sample a under an environment of 24.5°C and 68% RH for 2 hours.)
  • Embodiments of the present invention can provide an optical filter that has high whiteness, can scatter and reflect visible light, and has excellent linear transmittance of near-infrared light.
  • FIG. 1 is a schematic diagram for explaining the optical characteristics of an optical filter according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing a method for measuring the linear transmittance of the optical filter according to the embodiment of the present invention.
  • FIG. 3 is a schematic cross-sectional view showing an example of a near-infrared transmission layer in an optical filter according to an embodiment of the present invention.
  • the same components in each drawing may be given the same reference numerals, and duplicate descriptions may be omitted.
  • the number, position, size, shape, etc. of the components are not limited to the embodiments of the present invention, and may be any number, position, size, shape, etc. that is preferable for implementing the present invention.
  • the optical filter according to the embodiment of the present invention has a near-infrared transmitting layer having a moisture content change rate calculated by formula (1) of less than 1.09%, and further has other layers as necessary.
  • Fig. 1 is a schematic diagram for explaining the optical characteristics of an optical filter according to an embodiment of the present invention.
  • incident light I0 when incident light I0 is incident on an optical filter 10, part of the incident light I0 passes through the optical filter 10 (transmitted light Ii ), part is reflected at the interface (interface reflected light Ri ), and the other part is scattered.
  • the scattered light includes forward scattered light Sf emitted forward from the optical filter 10 and backward scattered light Sb emitted backward.
  • the optical filter 10 can scatter and reflect visible light by the backscattered light Sb , and the backscattered light Sb causes the optical filter 10 to exhibit a white color.
  • the near-infrared transmitting layer of the optical filter according to the embodiment of the present invention has a low absorptance for light with wavelengths of 400 nm to 2,000 nm.
  • the optical filter 10 has excellent linear transmittance of near-infrared light. That is, most of the incident light I0 incident on the optical filter 10 becomes transmitted light Ii , and the forward scattered light Sf is small.
  • an image sensor such as an InGaAs (indium gallium arsenic) sensor, an InGaAs/GaAsSb (indium gallium arsenic/gallium arsenic antimony) sensor, a CMOS (Complementary Metal Oxide Semiconductor) sensor, an NMOS (Negative-channel Metal Oxide Semiconductor) sensor, or a CCD (Charge Coupled Device) sensor, a sharp image with strong contrast (light and dark) can be obtained.
  • InGaAs indium gallium arsenic
  • InGaAs/GaAsSb indium gallium arsenic/gallium arsenic antimony
  • CMOS Complementary Metal Oxide Semiconductor
  • NMOS Negative-channel Metal Oxide Semiconductor
  • CCD Charge Coupled Device
  • near-infrared light means light that contains at least light (electromagnetic waves) with a wavelength in the range of 760 nm or more and 2,000 nm or less. This wavelength range is suitable for use in sensing or communication.
  • visible light means light with a wavelength in the range of 400 nm or more and less than 760 nm.
  • the optical filter according to the embodiment of the present invention may exhibit a white color.
  • the "whiteness” means the degree of whiteness.
  • the whiteness can be evaluated by the L * value of the backscattered light of the optical filter measured by a spectrophotometer in the SCE method on the CIE1976 color space when the standard light is a D65 light source.
  • the L * value of the optical filter according to the embodiment of the present invention is not particularly limited as long as it can exhibit white color, and can be appropriately selected according to the purpose, but is preferably 40 or more, more preferably 50 or more, and even more preferably 72 or more. In other words, the larger the L * value, the higher the whiteness. If the L * value of the optical filter according to the embodiment of the present invention is 40 or more, it can be said to be approximately white.
  • the upper limit of the L * value of the optical filter according to the embodiment of the present invention is 100.
  • layers other than the near-infrared transmitting layer in the optical filter according to the embodiment of the present invention can be selected so as not to affect the whiteness of the near-infrared transmitting layer. Therefore, the whiteness of the optical filter according to the embodiment of the present invention is synonymous with the whiteness of the near-infrared transmitting layer in the optical filter.
  • the linear transmittance of the optical filter according to the embodiment of the present invention to near-infrared light is not particularly limited and may be appropriately selected depending on the purpose, but is preferably 65% or more, more preferably 75% or more, even more preferably 80% or more, and particularly preferably 85% or more.
  • the wavelength range of light in which the linear transmittance of the optical filter according to the embodiment of the present invention is 65% or more is not particularly limited as long as it is near infrared and can be appropriately selected depending on the purpose, but is preferably 810 nm or more and 1,700 nm or less, more preferably 840 nm or more and 1,650 nm or less, even more preferably 840 nm or more and 1,000 nm or less, and particularly preferably 840 nm or more and 950 nm or less.
  • the optical filter according to the embodiment of the present invention has a linear transmittance of 65% or more for light with a wavelength of 810 nm or more and 1,700 nm or less, it can be suitably used in, for example, InGaAs sensors, InGaAs/GaAsSb sensors, CMOS sensors, NMOS sensors, CCD sensors, etc.
  • layers other than the near-infrared transmitting layer in the optical filter according to the embodiment of the present invention can be selected so as not to affect the linear transmittance of the near-infrared light of the near-infrared transmitting layer. Therefore, the linear transmittance of the optical filter according to the embodiment of the present invention to the near-infrared light is synonymous with the linear transmittance of the near-infrared light of the near-infrared transmitting layer in the optical filter.
  • the linear transmittance of the optical filter according to the embodiment of the present invention to near-infrared light can be adjusted by adjusting one or more selected from the group consisting of the average refractive index of the matrix and particles in the near-infrared light transmitting layer to visible light, the average particle size of the particles to visible light, the volume fraction of the matrix and particles, the distribution of the particles (degree of non-periodicity), and the thickness of the near-infrared light transmitting layer.
  • the linear transmittance of the optical filter according to the embodiment of the present invention to near-infrared light can be measured as follows. It can be measured using a spectrometer such as an ultraviolet-visible-near-infrared spectrophotometer, using the measurement method shown in Figure 2. A specific method for measuring the linear transmittance of the optical filter to near-infrared light is as described in the examples below.
  • the linear transmittance spectrum has a small incidence angle dependency, and the linear transmittance when the incidence angle of 940 nm near infrared radiation is 60° is more preferably 80% or more, even more preferably 85% or more, and particularly preferably 90% or more, compared to the linear transmittance when the incidence angle of 940 nm near infrared radiation is 0°.
  • Such incidence angle dependency of the optical filter according to the embodiment of the present invention is believed to be due to the fact that the particles in the near-infrared transmission layer included in the optical filter described later constitute a colloidal amorphous aggregate.
  • the particles constituting the colloidal amorphous aggregate decrease in linear transmittance for light on the shorter wavelength side as the incidence angle increases because the intensity of scattered light of visible light, particularly visible light on the longer wavelength side, increases. Therefore, when the optical filter according to the embodiment of the present invention is viewed obliquely, the intensity of diffuse reflected light (backscattered light) increases, and the white luminance (L * ) may increase.
  • the structure, shape, and size of the optical filter according to the embodiment of the present invention are not particularly limited and can be appropriately selected according to the purpose.
  • the structure of the optical filter according to the embodiment of the present invention may be a two-dimensional structure (planar structure) or a three-dimensional structure (stereoscopic structure).
  • the shape of the optical filter according to the embodiment of the present invention can be, for example, a film. If the optical filter according to the embodiment of the present invention is a film-like filter having flexibility, it is preferable in that it is easy to mold into a desired shape.
  • a film-like optical filter may be formed on the surface of an object having a three-dimensional structure using a known coating method to form an optical filter having a three-dimensional structure.
  • the shape of the surface of the object having a three-dimensional structure is not particularly limited and can be any shape, for example, a shape consisting of a part or all of a sphere, a shape consisting of a curved surface of any shape, a shape consisting of a part or all of the surface of a polyhedron, etc.
  • the surface of the object does not cause light scattering.
  • the thickness of the optical filter according to the embodiment of the present invention is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 10 ⁇ m to 10 mm, more preferably 10 ⁇ m to 1 mm, and even more preferably 10 ⁇ m to 500 ⁇ m.
  • the thickness of the optical filter according to the embodiment of the present invention is 10 ⁇ m to 10 mm, it can exhibit flexibility.
  • the near-infrared transmitting layer refers to a filter layer having spectral characteristics that block at least a part of visible light and transmit at least a part of near-infrared light.
  • the near-infrared transmitting layer contains a matrix and fine particles dispersed in the matrix, and may further contain other components as necessary.
  • the moisture content change rate of the near-infrared transmitting layer calculated by the following formula (1) is less than 1.09%, preferably 0.95% or less, more preferably 0.90% or less, even more preferably 0.40% or less, and particularly preferably 0.35% or less.
  • the lower limit of the moisture content change rate of the near-infrared transmitting layer is not particularly limited and can be appropriately selected according to the purpose, but is preferably 0.10% or more, more preferably 0.15% or more, even more preferably 0.20% or more, and particularly preferably 0.25% or more.
  • the upper limit and lower limit of the moisture content change rate of the near-infrared transmitting layer can be appropriately combined, and is preferably 0.10% or more and less than 1.09%, more preferably 0.10% or more and 0.95% or less, even more preferably 0.15% or more and 0.90% or less, even more preferably 0.20% or more and 0.40% or less, and particularly preferably 0.25% or more and 0.35% or less.
  • the moisture content change rate of the near-infrared transmitting layer is 1.09% or more, the whiteness is poor.
  • the moisture content change rate of the near-infrared transmitting layer is less than 1.09%, the whiteness is good, and when it is 0.35% or less, the whiteness is even better.
  • the moisture content change rate is measured as described in the examples below.
  • the moisture content change rate of the near-infrared transmitting layer can be adjusted by the type of matrix, etc.
  • Moisture content change rate (%) (B - A)
  • a x 100 Formula (1) “In formula (1), "A” represents the mass of sample a obtained by leaving the near-infrared transmitting layer under a reduced pressure of 0.1 MPa for 24 hours using a vacuum dryer set at 80°C, and "B” represents the mass of sample b obtained by leaving sample a under an environment of 24.5°C and 68% RH for 2 hours.)
  • the average thickness of the near-infrared transmitting layer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 1,000 ⁇ m or less, more preferably 500 ⁇ m or less, and even more preferably 350 ⁇ m or less. When the average thickness of the near-infrared transmitting layer is 1,000 ⁇ m or less, sufficient photocurability can be obtained.
  • the "average thickness" of the near-infrared transmitting layer means the average value of the thicknesses of five points arbitrarily selected from the near-infrared transmitting layer.
  • the thickness of the near-infrared transmitting layer can be measured by observing a cross section of the near-infrared transmitting layer using a transmission electron microscope (TEM) (e.g., HT7820, manufactured by Hitachi High-Tech Corporation).
  • TEM transmission electron microscope
  • the absolute value of the difference between the nM and the nP ,
  • ") is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.01 or more, more preferably 0.03 or more, even more preferably 0.08 or more, and particularly preferably 0.09 or more.
  • is preferably less than 0.10.
  • can be appropriately combined, and is preferably 0.01 or more and less than 0.10, more preferably 0.03 or more and less than 0.10, even more preferably 0.08 or more and less than 0.10, and particularly preferably 0.09 or more and less than 0.10.
  • the average refractive index for visible light refers to the average refractive index for light of 546 nm.
  • can be adjusted by the type of matrix, the type of fine particles, or a combination thereof.
  • the refractive index of the matrix for visible light can be measured using an Abbe refractometer (e.g., Model DR-A1, manufactured by Atago Co., Ltd.).
  • Abbe refractometer e.g., Model DR-A1, manufactured by Atago Co., Ltd.
  • the refractive index of the microparticles for visible light can be measured by a liquid immersion method. Specifically, the microparticles are dried and turned into a powder, and mixed with refractive liquids having various refractive indices. The refractive index when the hollow microparticles become transparent is taken as the refractive index of the microparticles in the embodiment of the present invention.
  • the "average refractive index" refers to the average value of the refractive indexes obtained by measuring the matrix or the fine particles three times using the above method. Therefore, in an embodiment of the present invention, the refractive index of the matrix for visible light and the refractive index of the fine particles for visible light are the refractive indexes of the matrix (e.g., curable resin) and the fine particles as materials forming the near-infrared transmitting layer before they are cured into the near-infrared transmitting layer.
  • the matrix e.g., curable resin
  • the material constituting the matrix is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include acrylic resins (e.g., polymethyl methacrylate, polymethyl acrylate, etc.), polycarbonates, polyesters, poly(diethylene glycol bisallyl carbonate), polyurethanes, epoxy resins, polyimides, etc. These may be used alone or in combination of two or more.
  • acrylic resins e.g., polymethyl methacrylate, polymethyl acrylate, etc.
  • polycarbonates e.g., polycarbonates, polyesters, poly(diethylene glycol bisallyl carbonate), polyurethanes, epoxy resins, polyimides, etc. These may be used alone or in combination of two or more.
  • the matrix is preferably formed using a curable resin.
  • the curable resin may be a thermosetting resin or a photocurable resin, but from the viewpoint of mass production, it is preferable to use a photocurable resin.
  • the photocurable resin is not particularly limited and may be appropriately selected depending on the purpose.
  • a (meth)acrylate resin may be used.
  • the (meth)acrylate contains a bifunctional or trifunctional or higher (meth)acrylate.
  • "(meth)acrylate” means at least one of "acrylate” and "methacrylate”.
  • the matrix preferably has optical isotropy.
  • a curable resin obtained by curing a polyfunctional monomer is used, a matrix having a crosslinked structure is obtained, which improves the heat resistance and light resistance of the near-infrared transmitting layer.
  • hydrophilic monomer When using fine particles with a hydrophilic surface as the fine particles, it is preferable to form the matrix by photocuring a hydrophilic monomer.
  • hydrophilic monomer there are no particular limitations on the hydrophilic monomer, and it can be appropriately selected according to the purpose.
  • monomers can be mentioned. These may be used alone or in combination of two or more kinds. When two or more kinds of monomers are used, it may contain a monofunctional monomer and a polyfunctional monomer, or it may contain two or more kinds of polyfunctional monomers. These monomers can be cured by a curing reaction using a known photopolymerization initiator.
  • the content of the matrix in the near-infrared transmitting layer is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 40% by volume or more and 96% by volume or less, more preferably 50% by volume or more and 80% by volume or less, and even more preferably 60% by volume or more and 80% by volume or less, based on the total volume of the near-infrared transmitting layer.
  • the matrix content in the near-infrared transparent layer can be measured by 3D structural analysis using a real-time 3D analytical FIB-SEM combination device (NX9000, Hitachi High-Tech Corporation).
  • the average refractive index nM of the matrix with respect to visible light is not particularly limited and can be appropriately selected according to the average refractive index nP of the fine particles, but it is preferable that the refractive index difference
  • the average refractive index nM of the matrix with respect to visible light is 1.52 or more, a high whiteness is obtained, when it is 1.53 or more, a higher whiteness is obtained, and when it is 1.535 or more, a particularly high whiteness is obtained.
  • the average refractive index nM of the matrix with respect to visible light means the average refractive index of a mixture of multiple types of curable resins.
  • the matrix preferably includes a matrix having an average refractive index for visible light of 1.57 or more.
  • the content of the matrix having an average refractive index of 1.57 or more for visible light in the matrix is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 40% by mass or less, more preferably 10% to 40% by mass, more preferably 20% to 40% by mass, and even more preferably 30% to 40% by mass.
  • the content of the matrix having an average refractive index of 1.57 or more for visible light in the matrix is 40% by mass or less, a high degree of whiteness is obtained, and when it is 30% to 40% by mass, an especially high degree of whiteness is obtained.
  • the matrix is transparent to visible light (hereinafter simply referred to as "transparent").
  • the fine particles are preferably transparent to visible light (hereinafter simply referred to as "transparent").
  • the transparent fine particles may have optical isotropy.
  • the fine particles are not particularly limited and can be appropriately selected depending on the purpose. Examples include inorganic fine particles and resin fine particles. These may be used alone or in combination of two or more types.
  • the inorganic fine particles are not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include silica fine particles, titanium oxide fine particles, and zirconia fine particles. Of these, silica fine particles are preferred as the fine particles.
  • the silica fine particles are not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include silica fine particles synthesized by the Stöber method and hollow silica fine particles containing air.
  • the resin microparticles are not particularly limited and can be appropriately selected depending on the purpose, but microparticles made of at least one type selected from the group consisting of polystyrene and polymethyl methacrylate are preferred, and microparticles made of at least one type selected from the group consisting of cross-linked polystyrene, cross-linked polymethyl methacrylate, and cross-linked styrene-methyl methacrylate copolymer are more preferred.
  • microparticles for example, polystyrene microparticles or polymethyl methacrylate microparticles synthesized by emulsion polymerization can be appropriately used. Hollow resin microparticles containing air can also be used.
  • inorganic fine particles are preferred as the fine particles because they have excellent heat resistance and light resistance, and silica fine particles are more preferred because they provide a sharp particle size distribution.
  • the fine particles preferably form a colloidal amorphous aggregate in the near-infrared transmitting layer.
  • a colloidal amorphous aggregate refers to an aggregate of colloidal particles having a particle size of 1 nm to 1 ⁇ m, which does not have long-range order and does not cause Bragg reflection.
  • colloidal particles When colloidal particles are distributed so as to have a long-range order, they become a so-called colloidal crystal (a type of photonic crystal), in contrast to the occurrence of Bragg reflection.
  • colloidal crystal a type of photonic crystal
  • Colloidal crystals which have an orderly structure in which colloidal particles are regularly arranged, reflect light of a wavelength corresponding to their lattice constant due to Bragg diffraction.
  • colloidal crystals in which submicron-order colloidal particles are regularly arranged reflect light of wavelengths ranging from ultraviolet light or visible light to infrared light.
  • structural colors such as iridescence. Therefore, the presence or absence of iridescence can be visually checked to confirm whether or not the particles form a colloidal amorphous aggregate.
  • the microparticles form a colloidal amorphous aggregate, and the distribution state of the microparticles in the colloidal amorphous aggregate, can also be confirmed using the average value (La) and standard deviation (Ld) of the distance between the centers of gravity of adjacent microparticles as indicators.
  • the average value (La) of the distance between the centers of gravity of adjacent microparticles is preferably 100 nm or more, more preferably 150 nm or more, even more preferably 175 nm or more, and particularly preferably 200 nm or more.
  • the upper limit of the average value (La) of the distance between the centers of gravity of adjacent microparticles but it is preferably 600 nm or less, and more preferably 500 nm or less.
  • the average value (La) and standard deviation (Ld) of the distance between the centers of gravity of adjacent particles can be calculated from a cross-sectional transmission electron microscope (TEM) image of the near-infrared transmitting layer.
  • TEM transmission electron microscope
  • the average value (La) and standard deviation (Ld) of the distance between the centers of gravity of adjacent particles can be obtained by performing automatic identification Delaunay diagram analysis of the particles using image processing software (e.g., Image J, open source).
  • image processing software e.g., Image J, open source
  • the coefficient of variation (CV value of distance) is obtained from the average value of the distance between the centers of gravity (hereinafter sometimes referred to as the "average distance between the centers of gravity") and the standard deviation.
  • the average distance between the centers of gravity when calculating the distance between the centers of gravity, only particles with a particle size of 150 nm or more are considered, and particles with a particle size of less than 150 nm are not considered.
  • the coefficient of variation of the average distance between the centers of gravity of the fine particles is not particularly limited, but is preferably 10% or more, more preferably 15% or more, even more preferably 20% or more, and particularly preferably 25% or more.
  • the upper limit of the coefficient of variation of the average distance between the centers of gravity of the fine particles is also not particularly limited, but is preferably 45% or less, more preferably 40% or less, and even more preferably 35% or less.
  • the lower limit and upper limit of the coefficient of variation of the average distance between the centers of gravity of the fine particles can be appropriately combined, and is preferably 10% or more and 45% or less, more preferably 15% or more and 40% or less, even more preferably 20% or more and 40% or less, and especially preferably 25% or more and 35% or less.
  • the coefficient of variation of the average distance between the centers of gravity of the fine particles is 10% or more, the long-range order is small, and the reflection color with angle dependency due to Bragg reflection is difficult to appear.
  • the coefficient of variation of the average distance between the centers of gravity of the fine particles is 45% or less, the effect of Mie scattering is small, and the wavelength dependency of light scattering tends to be large.
  • the average particle size of the microparticles there is no particular restriction on the average particle size of the microparticles, and it can be appropriately selected according to the purpose, but it is preferable to include monodispersed microparticles having a wavelength of at least one tenth of the wavelength of the near infrared ray, and for near infrared rays having a wavelength range of 760 nm to 2,000 nm, the average particle size of the microparticles is more preferably at least 80 nm, even more preferably 150 nm or more, and particularly preferably 200 nm or more. There is also no particular restriction on the upper limit of the average particle size of the microparticles, but it is preferably 300 nm or less.
  • the lower limit and upper limit of the average particle size of the microparticles can be appropriately combined, and for near infrared rays having a wavelength range of 760 nm to 2,000 nm, the average particle size of the microparticles is more preferably 80 nm to 300 nm, even more preferably 150 nm to 300 nm, and particularly preferably 200 nm to 300 nm.
  • the microparticles may also include two or more monodispersed microparticles having different average particle sizes. By using monodispersed microparticles having an average particle size of at least one tenth of the wavelength of the near infrared ray, the linear transmittance of the near infrared ray can be increased. This differs in principle from the optical articles described in Patent Documents 2 and 3, which use Rayleigh scattering.
  • microparticles There are no particular limitations on the shape of the microparticles, but they are preferably roughly spherical.
  • microparticles are also used to mean an aggregate of microparticles.
  • “monodispersed microparticles” preferably have a coefficient of variation (standard deviation/average particle diameter expressed as a percentage) of 20% or less, more preferably 10% or less, and even more preferably 1% or more and 5% or less.
  • the average particle size of the microparticles refers to the average particle size determined by a focused ion beam scanning electron microscope (hereinafter sometimes referred to as "FIB-SEM"). Specifically, the average particle size of the microparticles can be calculated by the method described in the examples.
  • FIB-SEM focused ion beam scanning electron microscope
  • the average refractive index nP of the fine particles with respect to visible light is not particularly limited and can be appropriately selected according to the average refractive index nM of the matrix, but it is preferable that the refractive index difference
  • the average refractive index nP of the fine particles with respect to visible light is 1.2 or more and 1.6 or less, a high degree of whiteness can be obtained.
  • the average refractive index nP of the fine particles with respect to visible light means the average refractive index of a mixture of multiple types of fine particles.
  • the content of the fine particles in the near-infrared transmitting layer is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 6% by volume or more and 60% by volume or less, more preferably 20% by volume or more and 50% by volume or less, and even more preferably 2% by volume or more and 40% by volume or less, based on the total volume of the near-infrared transmitting layer.
  • Other components in the near-infrared transmitting layer are not particularly limited as long as they do not impair the effects of the present invention, and can be appropriately selected depending on the purpose, and examples thereof include a polymerization initiator used when curing and forming the matrix.
  • the polymerization initiator can be appropriately selected depending on the curing method, and may be a thermal polymerization initiator or a photopolymerization initiator.
  • photopolymerization initiators include carbonyl compounds (e.g., benzoin ether, benzophenone, anthraquinone, thioxane, ketal, acetophenone, 2-hydroxy-2-methylpropiophenone, etc.), sulfur compounds (e.g., disulfides, dithiocarbamates, etc.), organic peroxides (e.g., benzoyl peroxide, etc.), azo compounds, transition metal complexes, polysilane compounds, dye sensitizers, etc. These may be used alone or in combination of two or more.
  • carbonyl compounds e.g., benzoin ether, benzophenone, anthraquinone, thioxane, ketal, acetophenone, 2-hydroxy-2-methylpropiophenone, etc.
  • sulfur compounds e.g., disulfides, dithiocarbamates, etc.
  • organic peroxides e.g., benzoyl peroxid
  • the content of the photopolymerization initiator in the near-infrared transmitting layer is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 0.05 parts by mass or more and 3 parts by mass or less, and more preferably 0.05 parts by mass or more and 1 part by mass or less, relative to 100 parts by mass of the monomer that constitutes the matrix.
  • Fig. 3 is a schematic cross-sectional view showing an example of the near-infrared transmission layer in the optical filter according to the embodiment of the present invention.
  • the near-infrared transmission layer 11 includes a matrix 12 that is transparent to visible light, and transparent fine particles 14 dispersed in the transparent matrix 12.
  • the fine particles 14 preferably constitute a colloidal amorphous aggregate.
  • the near-infrared transmission layer 11 may also contain other fine particles that do not disturb the colloidal amorphous aggregate constituted by the fine particles 14.
  • the near-infrared transmitting layer 11 has a substantially flat surface, as shown in FIG. 3.
  • a substantially flat surface means a surface that does not have an uneven structure of a size that scatters (diffracts) or diffusely reflects visible light or near-infrared light.
  • the near-infrared transmitting layer 11 does not contain cholesteric liquid crystals (broadly including polymer liquid crystals, low molecular weight liquid crystals, liquid crystal mixtures thereof, and liquid crystal materials thereof mixed with a crosslinking agent and solidified by crosslinking or the like, which exhibit a cholesteric phase).
  • the optical filter according to the embodiment of the present invention may have layers other than the near-infrared transmitting layer as long as the effects of the present invention are not impaired.
  • Other layers include, for example, a base layer, a filter layer having optical properties different from those of the near-infrared transmitting layer, a near-infrared absorbing layer, a color filter layer, a print layer, and the like.
  • the shape, structure, and size of the other layers are not particularly limited and can be appropriately selected depending on the purpose.
  • the shape can be a film, a plate, etc.
  • the optical filter according to the embodiment of the present invention may have a single layer structure consisting of only a near-infrared transmitting layer, a laminated structure of a near-infrared transmitting layer and other layers, or a laminated structure having multiple near-infrared transmitting layers and other layers.
  • the optical filter according to the embodiment of the present invention has a laminated structure, there are no particular restrictions on the order of stacking as long as it does not impair the effects of the present invention, and it can be selected appropriately depending on the purpose.
  • the material of the substrate constituting the substrate layer is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include resins such as PET (polyethylene terephthalate), TAC (triacetyl cellulose), PI (polyimide), PMMA (methyl methacrylate), COP (cycloolefin polymer), glass, etc.
  • resins such as PET (polyethylene terephthalate), TAC (triacetyl cellulose), PI (polyimide), PMMA (methyl methacrylate), COP (cycloolefin polymer), glass, etc.
  • a near-infrared transmitting layer is laminated as an optical filter, it may be transferred from the coated substrate to another substrate.
  • the linear transmittance of the base layer for near-infrared light is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 85% or more, and more preferably 90% or more.
  • the linear transmittance of the base layer can be measured by a method similar to that for measuring the linear transmittance of an optical filter.
  • the haze of the substrate layer is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 2% or less, more preferably 1% or less, and even more preferably 0.5% or less.
  • the haze of the substrate layer can be measured using a haze meter (for example, Model HM-150N, manufactured by Murakami Color Research Laboratory Co., Ltd.).
  • the average refractive index of the base layer for visible light is not particularly limited and can be selected appropriately depending on the purpose, but the smaller the difference in average refractive index between the base layer and the near-infrared transmitting layer, the less loss due to interfacial reflection will be, and it is preferable, with 0.08 or less being more preferable, 0.03 or less being even more preferable, and 0.01 or less being particularly preferable.
  • the average refractive index of the base layer for visible light can be measured with an Abbe refractometer (for example, model DR-A1, manufactured by Atago Co., Ltd.).
  • the near-infrared transmitting layer be disposed on the surface of the base layer.
  • the near-infrared absorbing layer is a filter layer that absorbs near-infrared rays.
  • the near-infrared absorbing layer is preferably disposed on the side where the incident light that is incident on the near-infrared absorbing layer is transmitted and the transmitted light is emitted.
  • the near-infrared absorbing layer can efficiently absorb near-infrared rays.
  • the color filter layer is a filter layer that exhibits black or other colors (e.g., yellow, red, blue, pink, brown, etc.). Since the optical filter according to the embodiment of the present invention exhibits white color, even when color filter layers are used in layers, the colors do not interfere with each other, and the design can be improved.
  • black or other colors e.g., yellow, red, blue, pink, brown, etc.
  • the print layer is a layer having a desired print image such as a color or pattern (e.g., letters, pictures, photographs, etc.).
  • the desired print image can be printed using infrared-transmitting ink to provide an optical filter having rich colors and a rich design without reducing the linear transmittance of near-infrared rays of the optical filter of the embodiment of the present invention.
  • the optical filter of the embodiment of the present invention exhibits white color, the design can be enhanced by further having a print layer.
  • the print layer is preferably disposed on the surface of the near-infrared transmitting layer.
  • the print layer may be formed directly on the surface of the near-infrared transmitting layer, or a transparent film having a print layer formed on its surface may be disposed on the near-infrared transmitting layer.
  • a publicly known infrared-transmitting ink can be selected depending on the application or the wavelength of the near-infrared light to be transmitted.
  • the terms "on,” “disposed on the surface,” “disposed on the side from which transmitted light is emitted,” and the like, of one layer mean that one layer can be connected or bonded directly on, above, or on top of the other layer. In other words, it indicates that there may be further layers interposed between one layer and the other layer.
  • the method for producing the optical filter according to the embodiment of the present invention is not particularly limited, and any known method can be used, but the method for producing the optical filter according to the embodiment of the present invention described below is preferably used.
  • optical filters according to the embodiments of the present invention can be suitably used in image sensors such as InGaAs sensors, InGaAs/GaAsSb sensors, CMOS sensors, NMOS sensors, and CCD sensors, sensing devices using these image sensors (e.g., infrared cameras), communication devices, solar cells, heaters (e.g., heaters using infrared rays), power supply devices (e.g., optically powered devices using infrared rays), and the like.
  • image sensors such as InGaAs sensors, InGaAs/GaAsSb sensors, CMOS sensors, NMOS sensors, and CCD sensors, sensing devices using these image sensors (e.g., infrared cameras), communication devices, solar cells, heaters (e.g., heaters using infrared rays), power supply devices (e.g., optically powered devices using infrared rays), and the like.
  • the optical filter according to the embodiment of the present invention can obtain the desired optical characteristics (e.g., whiteness and near-infrared linear transmittance) by adjusting the moisture content change rate of the near-infrared transmitting layer.
  • desired optical characteristics e.g., whiteness and near-infrared linear transmittance
  • the method for manufacturing an optical filter according to the first embodiment of the present invention includes a step of dispersing fine particles in a curable resin to prepare a curable resin composition (hereinafter, may be referred to as a "curable resin composition preparation step"), a step of applying the curable resin composition to the surface of a substrate (hereinafter, may be referred to as an "application step"), and a step of curing the curable resin contained in the curable resin composition applied to the surface of the substrate to form a near-infrared transmitting layer (hereinafter, may be referred to as a "near-infrared transmitting layer formation step”), and further includes other steps as necessary.
  • a curable resin composition preparation step a step of applying the curable resin composition to the surface of a substrate
  • an application step a step of applying the curable resin composition to the surface of a substrate
  • an application step a step of curing the curable resin contained in the curable resin composition applied to the surface of the substrate to form a near-
  • the curable resin composition preparation step is a step of dispersing fine particles in a curable resin to prepare a curable resin composition.
  • the curable resin and fine particles are as described in the Near-infrared transmitting layer section of the (Optical filter) section, so a detailed explanation is omitted here.
  • the method for preparing the curable resin composition is not particularly limited as long as it is a method that can mix the matrix with the fine particles and, if necessary, other components, and can disperse the fine particles in the matrix, and examples of the method include preparation methods using known devices such as mixing devices and dispersing devices, such as homomixers and homogenizers (e.g., ultrasonic homogenizers, high-pressure homogenizers, etc.).
  • mixing devices and dispersing devices such as homomixers and homogenizers (e.g., ultrasonic homogenizers, high-pressure homogenizers, etc.).
  • the temperature and time when preparing the curable resin composition there are no particular limitations on the temperature and time when preparing the curable resin composition, and they can be selected appropriately depending on the purpose. However, it is necessary to prepare the composition at a temperature below the curing temperature of the curable resin composition.
  • the application step is a step of applying the curable resin composition to the surface of a substrate.
  • the application step preferably applies the curable resin composition to the surface of the substrate so that the average thickness after curing is 1,000 ⁇ m or less, more preferably 500 ⁇ m or less, and even more preferably 350 ⁇ m or less.
  • the near-infrared transmitting layer can be adjusted by the amount of the curable resin composition applied in the application step.
  • the substrate is as described in the ⁇ Substrate layer>> section under ⁇ Other layers>> (Optical filter), so a detailed description is omitted.
  • the method for applying the curable resin composition to the surface of the substrate is not particularly limited and can be appropriately selected from known methods, such as dip coating, spray coating, die coating, roll coating, blade coating, and other coating methods, and printing methods.
  • the near-infrared transmitting layer forming step is a step of forming a near-infrared transmitting layer by curing the curable resin contained in the curable resin composition applied to the surface of the substrate.
  • the moisture content change rate of the near-infrared transmitting layer calculated by the following formula (1) is less than 1.09%.
  • Other characteristics of the near-infrared transmitting layer are as described in the ⁇ Near-infrared transmitting layer> section of (Optical filter), and therefore will not be described here.
  • Moisture content change rate (%) (B - A) A x 100 Formula (1) (In formula (1), "A” represents the mass of sample a obtained by leaving the near-infrared transmitting layer under a reduced pressure of 0.1 MPa for 24 hours using a vacuum dryer set at 80°C, and "B” represents the mass of sample b obtained by leaving the sample a under an environment of 24.5°C and 68% RH for 2 hours.)
  • the method for curing the curable resin is not particularly limited and can be appropriately selected depending on the characteristics of the curable resin and the type of polymerization initiator in the curable resin composition. It may be heat curing or photocuring, but from the viewpoint of mass production, photocuring is preferable.
  • thermo curing There are no particular limitations on the temperature and time for thermal curing, and the wavelength, illuminance, and time for photocuring, and these can be selected appropriately depending on the characteristics of the curable resin and the type of polymerization initiator in the curable resin composition.
  • the other steps in the method for producing the optical filter according to the first embodiment of the present invention are not particularly limited, and include the steps of forming other layers described in the item ⁇ Other Layers> of (Optical Filter).
  • the method for forming the other layers is not particularly limited, and can be appropriately selected from known methods.
  • the method for producing an optical filter according to the second embodiment of the present invention includes a step of dispersing fine particles in a curable resin to prepare a curable resin composition (hereinafter, may be referred to as a "curable resin composition preparation step”); a step of applying the curable resin composition to the surface of a temporary support (hereinafter, may be referred to as an "application step”); and a step of curing the curable resin contained in the curable resin composition applied to the surface of the temporary support to form a near-infrared transmission layer (hereinafter, may be referred to as a "near-infrared transmission layer formation step").
  • the method further includes a step of attaching the near-infrared transmission layer to a substrate (hereinafter, may be referred to as an “attachment step”) and a step of peeling the temporary support from the near-infrared transmission layer (hereinafter, may be referred to as a “peeling step”). Further, other steps may be included as necessary.
  • the curable resin composition preparation step, application step, and near-infrared transmission layer formation step in the method for producing an optical filter according to the second embodiment can be carried out in the same manner as in the method for producing an optical filter according to the first embodiment, except that the substrate in the curable resin composition preparation step, application step, and near-infrared transmission layer formation step in the method for producing an optical filter according to the first embodiment is changed to a temporary support.
  • the temporary support is not particularly limited, and any known release sheet can be used.
  • the release sheet is not particularly limited, and can be appropriately selected depending on the purpose, and examples include those described in the ⁇ Temporary Support> section of (Laminate and Transfer Optical Filter) below.
  • the attachment step is a step of attaching the near-infrared transmitting layer to the substrate.
  • the method of attaching the near-infrared transmitting layer to the substrate is not particularly limited, and examples thereof include a method of contacting the substrate and the near-infrared transmitting layer and, if necessary, pressing them by a known method.
  • the peeling step is a step of peeling the temporary support from the near-infrared transmitting layer.
  • the method of peeling the temporary support from the near-infrared transmitting layer is not particularly limited, and the temporary support may be peeled off manually or by using a machine or device.
  • the other steps in the method for producing the optical filter according to the second embodiment of the present invention are not particularly limited, and include the steps of forming other layers described in the item ⁇ Other Layers> of (Optical Filter), etc.
  • the method for forming the other layers is not particularly limited, and can be appropriately selected from known methods.
  • the method for producing an optical filter according to the second embodiment of the present invention can also be carried out using a laminate or an optical filter for transfer, which will be described later.
  • the method for producing an optical filter according to the second embodiment does not include the curable resin composition preparation step, the application step, and the near-infrared transmission layer formation step, and only carries out the attachment step of attaching the near-infrared transmission layer of the laminate or the optical filter for transfer to a substrate, and the peeling step of peeling the temporary support from the near-infrared transmission layer of the laminate or the optical filter for transfer, thereby enabling the optical filter to be produced simply and efficiently.
  • the optical module of an embodiment of the present invention includes a device having a near-infrared receiving unit, and an optical filter of an embodiment of the present invention arranged in front of the near-infrared receiving unit of the device, and further includes other components as necessary.
  • the device having a near-infrared receiving unit is not particularly limited, and examples thereof include a sensing device, a communication device, a solar cell, a heater, and a power supply device.
  • the device having a near-infrared receiving unit may be one type alone or two or more types.
  • the optical filter is an optical filter according to an embodiment of the present invention, and is as described in the (Optical Filter) section, so a description thereof will be omitted.
  • optical module of the embodiment of the present invention are not particularly limited as long as they do not impair the effects of the present invention, and examples include well-known components commonly used in sensing devices, communication devices, solar cells, heaters, and power supply devices.
  • the laminate of the embodiment of the present invention has a temporary support and an optical filter of the embodiment of the present invention laminated on the temporary support.
  • the laminate of the embodiment of the present invention can be preferably used by peeling off the temporary support from the optical filter.
  • the laminate can also be used as a transfer optical filter. That is, the transfer optical filter of the embodiment of the present invention has the optical filter of the embodiment of the present invention in a layered form on the temporary support.
  • the optical filter is an optical filter according to an embodiment of the present invention, and is as described in the (Optical Filter) section, so a description thereof will be omitted.
  • the temporary support is not particularly limited as long as it allows the production of an optical filter on its surface and does not affect the optical filter, particularly the near-infrared transmitting layer in the optical filter, and any known release sheet can be used.
  • the release sheet is not particularly limited and can be appropriately selected depending on the purpose.
  • Examples include paper such as kraft paper, glassine paper, and fine paper; resin films such as polyethylene, polypropylene (biaxially oriented polypropylene (OPP), uniaxially oriented polypropylene (CPP)), and polyethylene terephthalate (PET); laminated paper consisting of paper and a resin film; and paper that has been sealed with clay or polyvinyl alcohol and then treated with a release agent such as silicone resin on one or both sides. These may be used alone or in combination of two or more types.
  • the method for forming the optical filter in a layer on the temporary support there are no particular limitations on the method for forming the optical filter in a layer on the temporary support, and it can be formed in the same manner as in the optical filter manufacturing method, except that the substrate is replaced with a support.
  • the laminate and transfer optical filter are easy to store and transport, have excellent handleability, and are advantageous in that even if an optical filter cannot be formed directly on a substrate, the laminate or transfer optical filter can be attached to the substrate and the temporary support can be peeled off to easily form an optical filter on the substrate.
  • Example 1 90 parts by mass of acrylic monomer A and 10 parts by mass of acrylic monomer B were mixed to prepare a monomer mixture, and 100 parts by mass (solid content) of silica fine particles (monodispersed silica fine particles synthesized by the Stober method, average particle size 221 nm, Hautform (registered trademark) Sibol 220, manufactured by Fuji Chemical Co., Ltd.) and 0.2 parts by mass of a photopolymerization initiator (Darocur 1173, manufactured by BASF Japan Co., Ltd.) were added to the obtained monomer mixture, mixed, and dispersed to prepare a curable resin composition.
  • silica fine particles monodispersed silica fine particles synthesized by the Stober method, average particle size 221 nm, Hautform (registered trademark) Sibol 220, manufactured by Fuji Chemical Co., Ltd.
  • a photopolymerization initiator Darocur 1173, manufactured by BASF Japan Co., Ltd.
  • the curable resin composition was applied to the surface of a PET film (average refractive index for light with a wavelength of 550 nm: 1.576, linear transmittance for light with a wavelength of 940 nm: 89%, thickness: 100 ⁇ m) so as to obtain a film-like near-infrared transmitting layer with a thickness of 200 ⁇ m. Thereafter, ultraviolet rays were irradiated with a UV lamp, and the curable resin composition was photopolymerized and cured. The cured product was peeled off from the PET film to prepare an optical filter consisting of a near-infrared transmitting layer having a thickness of 200 ⁇ m.
  • Acrylic monomer A ethoxylated bisphenol A diacrylate represented by the following structural formula (1) (average refractive index for light having a wavelength of 546 nm: 1.52) (manufactured by Shin-Nakamura Chemical Co., Ltd.)
  • Acrylic monomer B 3-phenoxybenzyl acrylate represented by the following structural formula (2) (average refractive index for light with a wavelength of 546 nm: 1.57)
  • Examples 2 to 4 and Comparative Example 1 The curable resin compositions of Examples 2 to 4 and Comparative Example 1 were prepared in the same manner as in Example 1, except that the amounts of ethoxylated bisphenol A diacrylate and 3-phenoxybenzyl acrylate in Example 1 were changed to the amounts shown in Table 1, and optical filters were produced in the same manner as in Example 1.
  • the average particle size of the silica microparticles used in Examples 1 to 4 and Comparative Example 1 was measured by a focused ion beam scanning electron microscope (FIB-SEM). Specifically, as the FIB-SEM, a model number Helios G4 UX manufactured by FEI was used to obtain continuous cross-sectional SEM images, and after correcting the position of the continuous images, a three-dimensional image was reconstructed. More specifically, the acquisition of cross-sectional reflected electron images by SEM and FIB (acceleration voltage: 30 kV) processing were repeated 100 times at 50 nm intervals to reconstruct a three-dimensional image.
  • FIB-SEM focused ion beam scanning electron microscope
  • the obtained three-dimensional image was binarized using the Segmentation function of analysis software (AVIZO manufactured by Thermo Fisher Scientific) to extract the image of the microparticles.
  • AVIZO manufactured by Thermo Fisher Scientific
  • a Separate object operation was performed, and then the volume of each silica microparticle was calculated.
  • Each silica fine particle was assumed to be a sphere, the volume-equivalent sphere diameter was calculated, and the average particle diameter of the silica fine particles was determined as the average particle diameter.
  • the refractive index of the silica fine particles used in Examples 1 to 4 and Comparative Example 1 at a wavelength of 550 nm was measured by a liquid immersion method. Specifically, the silica fine particles were dried and turned into a powder state, and mixed with refractive index liquids having various refractive indices, and the refractive index was measured when the hollow silica fine particles became transparent. This measurement was performed three times, and the average value of the three measurements was calculated to obtain the average refractive index of the silica fine particles.
  • FIG. 2 is a schematic diagram showing the linear transmittance measurement method.
  • the linear transmittance was measured by placing the sample (optical filter 10) at a distance d of 20 cm from the opening of the integrating sphere 32.
  • the linear transmittance was calculated as a percentage of the intensity of the transmitted light I i obtained at this time relative to the intensity of the incident light I 0.
  • the diameter D of the opening was 1.8 cm, which corresponds to a solid angle of 0.025 sr.
  • an ultraviolet-visible-near infrared spectrophotometer (UH4150, manufactured by Hitachi High-Tech Science Corporation) was used. Table 1 shows linear transmittance values for near infrared rays with wavelengths of 850 nm and 940 nm.
  • the optical filters of Examples 1 to 4 in which the moisture content change rate of the near-infrared transmission layer was less than 1.09% had high whiteness. It was also found that the whiteness was even higher when the refractive index difference
  • Examples of aspects of the present invention include the following.
  • An optical filter comprising a near-infrared transmitting layer having a moisture content change rate calculated by the following formula (1) of less than 1.09%.
  • Moisture content change rate (%) (B - A)
  • a x 100 Formula (1) (In formula (1), "A” represents the mass of sample a obtained by leaving the near-infrared transmitting layer under a reduced pressure of 0.1 MPa for 24 hours using a vacuum dryer set at 80°C, and "B” represents the mass of sample b obtained by leaving the sample a under an environment of 24.5°C and 68% RH for 2 hours.)
  • ⁇ 3> The optical filter according to ⁇ 1> or ⁇ 2>, wherein the L * value measured by a spectrophotometer according to the SCE method is 72 or more.
  • ⁇ 4> The optical filter according to any one of ⁇ 1> to ⁇ 3>, wherein the near-infrared transmitting layer contains a matrix and fine particles dispersed in the matrix.
  • ⁇ 5> The near-infrared transmitting layer contains a matrix and fine particles dispersed in the matrix
  • ⁇ 6> The optical filter according to ⁇ 4> or ⁇ 5>, wherein, when an average refractive index of the matrix for visible light is nM and an average refractive index of the fine particles for the visible light is nP , an absolute value of a difference between the nM and the nP ,
  • the matrix includes a matrix having a refractive index for visible light of 1.57 or more.
  • ⁇ 8> The optical filter according to ⁇ 7>, wherein a content of the matrix having an average refractive index of 1.57 or more for visible light is 40 mass % or less with respect to a total mass of the matrix.
  • ⁇ 9> The optical filter according to any one of ⁇ 1> to ⁇ 8>, wherein the near-infrared transmitting layer has an average thickness of 1,000 ⁇ m or less.
  • a step of dispersing fine particles in a curable resin to prepare a curable resin composition applying the curable resin composition to a surface of a substrate; a step of curing the curable resin contained in the curable resin composition applied to the surface of the substrate to form a near-infrared transmitting layer; Including,
  • the method for producing an optical filter is characterized in that the near-infrared transmitting layer has a moisture content change rate calculated by the following formula (1) of less than 1.09%.
  • Moisture content change rate (%) (B - A) A x 100 Formula (1)
  • “A” represents the mass of sample a obtained by leaving the near-infrared transmitting layer under a reduced pressure of 0.1 MPa for 24 hours using a vacuum dryer set at 80°C
  • “B” represents the mass of sample b obtained by leaving the sample a under an environment of 24.5°C and 68% RH for 2 hours.
  • ⁇ 12> A device having a near-infrared receiving unit; The optical filter according to any one of ⁇ 1> to ⁇ 9>, which is disposed in front of the near-infrared receiving unit of the device;
  • the optical module is characterized by having the following features.
  • ⁇ 13> The optical module according to ⁇ 12>, wherein the device is a sensing device, a communication device, a solar cell, a heater, or a power supply device.
  • An optical filter for transfer comprising the optical filter according to any one of ⁇ 1> to ⁇ 9> above in the form of a layer on a temporary support.
  • a laminate comprising: a temporary support; and the optical filter according to any one of ⁇ 1> to ⁇ 9> laminated on the temporary support.
  • a step of dispersing fine particles in a curable resin to prepare a curable resin composition ; applying the curable resin composition to a surface of a temporary support; a step of curing the curable resin contained in the curable resin composition applied to the surface of the temporary support to form a near-infrared transmitting layer;
  • the method for producing an optical filter is characterized in that the near-infrared transmitting layer has a moisture content change rate calculated by the following formula (1) of less than 1.09%.
  • Moisture content change rate (%) (B - A) A x 100 Formula (1)
  • “A” represents the mass of sample a obtained by leaving the near-infrared transmitting layer under a reduced pressure of 0.1 MPa for 24 hours using a vacuum dryer set at 80°C
  • “B” represents the mass of sample b obtained by leaving the sample a under an environment of 24.5°C and 68% RH for 2 hours.
  • ⁇ 18> A step of attaching the near infrared transmission layer to a substrate; peeling the temporary support from the near infrared ray transmitting layer;
  • the method for producing an optical filter according to ⁇ 16> or ⁇ 17>, ⁇ 19> A step of attaching the near-infrared transmitting layer of the optical filter for transfer according to the ⁇ 14> or the optical filter of the laminate according to the ⁇ 15> to a substrate; peeling the temporary support from the near infrared ray transmitting layer;
  • the present invention relates to a method for producing an optical filter, comprising the steps of:
  • Optical filters according to embodiments of the present invention can be used, for example, as infrared transmission filters used in sensor technology or communication technology, solar cells, heaters that use infrared rays, optically powered devices that use infrared rays, etc.

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  • General Physics & Mathematics (AREA)
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Abstract

Ce filtre optique a une couche de transmission proche infrarouge ayant un taux de changement de teneur en eau calculé par la formule (1) ci-dessous inférieure à 1,09 %.　Formule (1) : Taux de variation de teneur en eau (%) = (B-A) A × 100 (dans la formule (1), "A" indique la masse d'un échantillon a obtenu en laissant la couche de transmission proche infrarouge pendant 24 heures sous une pression réduite de 0,1 MPa à l'aide d'un séchoir à vide qui est réglé à 80 °C, et "B" indique la masse d'un échantillon b obtenu en laissant l'échantillon a reposer pendant 2 heures dans un environnement de 24,5 °C et 68 % RH).
PCT/JP2024/015046 2023-09-28 2024-04-15 Filtre optique, procédé de fabrication de filtre optique, module optique et filtre optique pour transfert Pending WO2025069524A1 (fr)

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