WO2012132727A1 - 光学機器用遮光材 - Google Patents
光学機器用遮光材 Download PDFInfo
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- WO2012132727A1 WO2012132727A1 PCT/JP2012/055053 JP2012055053W WO2012132727A1 WO 2012132727 A1 WO2012132727 A1 WO 2012132727A1 JP 2012055053 W JP2012055053 W JP 2012055053W WO 2012132727 A1 WO2012132727 A1 WO 2012132727A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/003—Light absorbing elements
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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
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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
- G02B5/0221—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 an irregular structure
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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
- G02B5/0226—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 having particles on the surface
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B9/00—Exposure-making shutters; Diaphragms
- G03B9/02—Diaphragms
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B9/00—Exposure-making shutters; Diaphragms
- G03B9/08—Shutters
- G03B9/10—Blade or disc rotating or pivoting about axis normal to its plane
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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
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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
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
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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
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
Definitions
- the present invention relates to a light-shielding material that can be suitably used for light-shielding parts of various optical devices, and particularly has a perfect matting performance.
- the light-shielding film of the light-shielding film disclosed in Patent Document 1 was formed with only small irregularities on its surface, so that the matte property of the light-shielding film was not perfect. Specifically, reflection of light incident at an angle close to the vertical direction with respect to the film surface of the light shielding film can be suppressed, but light incident at an angle close to the plane direction is reflected. This reflection becomes a defect called a ghost in the optical apparatus, which causes a decrease in product performance. As described above, the technique of Patent Document 1 cannot absorb light incident at all angles.
- Condition A1 When the arithmetic average roughness in the three-dimensional surface roughness measurement is Sa, Sa is a value of 0.4 to 2.0.
- Condition A2 When the ten-point average roughness in the three-dimensional surface roughness measurement is Sz, the Sz value is 1 or more and 20 or less,
- Condition B1 The center plane of the unevenness in the three-dimensional surface roughness measurement is set as a reference plane, and the number of protrusions protruding from the reference plane to a plane located n times higher than Sa is Pn, and (n + 1) times Sa When the number of protrusions projecting to the plane at the height position is P n + 1 and the ratio of Pn and P n + 1 (P n + 1 / Pn) is Rn (where n is a positive integer), R1 is 55% or more and R4 is 7% or more, Condition B2: As in condition B1, when Pn, P n + 1 , and Rn are set, at least R1 is 55% or more,
- the light shielding material for optical equipment is generally constituted by laminating a light shielding film on a base material.
- the light shielding film includes at least a binder resin, black fine particles, and a matting agent.
- the present invention is not limited to such a configuration aspect of a laminated structure, and for example, an aspect of a molded product obtained by forming and curing a resin mixture containing black fine particles using a mold is also conceivable.
- the surface properties of the light-shielding film are appropriately adjusted. Therefore, the light-shielding film has a perfect matting effect (for example, G20, which will be described later) in a wide low-gloss area. Both G60 and G85 are low). Further, since the light shielding film contains a binder resin and black fine particles, it retains necessary physical properties such as light shielding properties.
- the light-shielding film of the light-shielding film disclosed in Patent Document 1 is formed with only small irregularities on the surface, and as a result, the surface properties were not properly controlled, so that a complete matte effect was achieved. It was not something that could be demonstrated.
- FIG. 1 is a partially broken perspective view showing a light shielding film of a light shielding material for an optical device according to an embodiment of the present invention.
- FIG. 2 is a plan view of the light shielding material of FIG. 1 viewed from substantially above (the light shielding film side).
- FIG. 3 is a cross-sectional image view of the broken portion when the light shielding material of FIG. 1 is broken along the thickness direction at an arbitrary position.
- the surface properties of the light shielding film 4 of the present embodiment are appropriately adjusted. Specifically, first, the arithmetic average roughness in the three-dimensional surface roughness measurement of the light shielding film 4 is Sa, and the ten-point average roughness is Sz. Sa and Sz here are in accordance with the measurement method of arithmetic average roughness (Ra) and ten-point average roughness (Rz) of two-dimensional surface roughness in JIS-B0601 (1994), and this is expressed in three dimensions. It is an extension. For example, it can be measured with a stylus type surface roughness measuring machine (SURFCOM 1500SD2-3DF: Tokyo Seimitsu Co., Ltd.).
- SURFCOM 1500SD2-3DF Tokyo Seimitsu Co., Ltd.
- the center plane of the unevenness in the three-dimensional surface roughness measurement of the light shielding film 4 is defined as a reference plane Fb (see FIG. 3).
- the central plane of the unevenness that is the premise of the reference surface Fb means a perfect plane that is assumed by flattening the convex portions and the concave portions.
- a plane at a height one time higher than Sa is indicated by a dotted line with a symbol Fsa1, and the number of projections P1 projecting on this plane Fsa1 is 11. It is.
- the “plane at a position twice as high as Sa” is indicated by a dotted line with a symbol Fsa2, and the number of projections P2 projecting on the plane Fsa2 is ten.
- a plane at a height three times higher than Sa is indicated by a dotted line with a symbol Fsa3, and the number of projections P3 projecting on the plane Fsa3 is five.
- the surface property of the light shielding film 4 is adjusted so as to satisfy at least one of the conditions A1 and A2 and at least one of the conditions B1 and B2.
- Condition A2 is a condition that the value of Sz falls within a predetermined range, specifically 1 or more, preferably 3 or more, more preferably 5 or more, 20 or less, preferably 18 or less, more preferably 16 or less. is there.
- the condition B1 is a condition that R1 and R4 are both greater than or equal to a predetermined value, specifically, R1 is 55% or more and R4 is 7% or more.
- Condition B2 is a condition in which at least R1 to R3 are all equal to or greater than a predetermined value, specifically, at least R1 is 55% or more, R2 is 15% or more, and R3 is 8% or more. Since “at least” R1, R2 and R3, Rn other than R1 to R3 (for example, R4) may be a positive integer%.
- the condition B2 of the present embodiment preferably includes a condition that R4 is 7% or more.
- R1 in the conditions B1 and B2 is preferably 56% or more, more preferably 57% or more.
- R2 is preferably 17% or more, more preferably 19% or more.
- R3 is preferably 9% or more, more preferably 10% or more.
- R4 is preferably 8% or more, more preferably 9% or more.
- A1 and A2 are parameters that determine the surface properties where the average of irregularities present on the surface of the light shielding film 4 (the surface opposite to the surface facing the substrate 2) is not too large.
- B1 and B2 are parameters that determine the degree of presence of large irregularities present on the surface of the light shielding film 4. As will be described later, it is presumed that the width of the low gloss region can be expanded by appropriately making small and large irregularities exist on the surface of the light shielding film 4.
- the thickness of the light-shielding film 4 can be appropriately changed according to the application to which the light-shielding material 1 is applied, but is usually preferably 2 ⁇ m to 15 ⁇ m, more preferably 2 ⁇ m to 12 ⁇ m, and still more preferably about 2 ⁇ m to 10 ⁇ m. In recent years, there is a tendency to reduce the thickness of the light-shielding film 4 (for example, about 6 ⁇ m or less), and this is addressed. In the present embodiment, since the surface properties are appropriately adjusted as described above, it is easy to obtain a low glossiness even when the thickness of the light shielding film 4 formed on the substrate 2 is 2 ⁇ m, and the light shielding film. It is easy to prevent pinholes and the like from being generated in 4, and a necessary and sufficient light shielding property can be easily obtained. By setting the thickness to 15 ⁇ m or less, it is easy to prevent the light shielding film 4 from cracking.
- the 60-degree specular gloss (G60) of the surface is less than 1, preferably less than 0.7, more preferably 0. .5, more preferably less than 0.3.
- the 85 degree specular gloss (G85) of the surface of the light shielding film 4 is less than 15, preferably less than 10, more preferably less than 8, and further preferably less than 6.
- the light-shielding film 4 of this embodiment has a 20-degree specular gloss (G20) of less than 0.3.
- the specular gloss is a parameter indicating the degree of reflection of light incident on the surface of the light-shielding film 4, and the smaller the value, the lower the gloss, and the lower the gloss, the more matt. To be judged.
- the 60-degree specular gloss refers to how much 100 light incident at an angle inclined by 60 degrees from the vertical direction of the surface of the light-shielding film 4 is reflected by the light-receiving portion inclined by 60 degrees on the reflection side ( This is a parameter indicating whether the light is incident on the light receiving unit.
- the 85 degree specular gloss and the 20 degree specular gloss are based on the same idea.
- the surface property of the light shielding film 4 is adjusted so as to satisfy the combination conditions described above, not only 20 degrees and 60 degrees, but also light incident from 85 degrees.
- the reason why reflection can be reliably suppressed that is, all of G20, G60, and G85 can be lowered) is not clear.
- this phenomenon is considered as follows. First, when the amount of reflected light of incident light at various incident angles is examined, the amount of reflected light at an angle close to the vertical direction with respect to the film surface of the light-shielding film 4 can be suppressed by simply reducing the surface roughness.
- the light shielding film 4 of the present embodiment having the above surface properties is configured to include at least a binder resin, black fine particles, and a matting agent.
- the light shielding material 1 for an optical device prepares a coating solution for forming a light shielding film by dispersing or dissolving at least a binder resin, black fine particles, and a matting agent in a solvent, and this coating solution is applied onto the substrate 2. It can be obtained by drying, forming a film, and laminating.
- binder resin examples include poly (meth) acrylic acid resin, polyester resin, polyvinyl acetate resin, polyvinyl chloride, polyvinyl butyral resin, cellulose resin, polystyrene / polybutadiene resin, polyurethane resin, alkyd resin, acrylic resin, Unsaturated polyester resin, epoxy ester resin, epoxy resin, acrylic polyol resin, polyester polyol resin, polyisocyanate, epoxy acrylate resin, urethane acrylate resin, polyester acrylate resin, polyether acrylate resin, phenol resin, melamine resin
- thermoplastic resins such as resins, urea-based resins, and diallyl phthalate-based resins, and thermosetting resins, and one or a mixture of two or more of these is used. When used for heat-resistant applications, thermosetting resins are preferably used.
- the content of the binder resin is preferably 20% by weight or more, more preferably 30% by weight or more, and further preferably 40% by weight or more in the nonvolatile content (solid content) contained in the coating liquid. By setting it as 20 weight% or more, it is easy to prevent the adhesive force of the light shielding film 4 with respect to the base material 2 falling.
- the content of the binder resin is preferably 70% by weight or less, more preferably 65% by weight or less, and still more preferably 60% by weight or less in the nonvolatile content of the coating solution. By setting it to 70% by weight or less, it is easy to prevent a decrease in necessary physical properties (such as light shielding properties) of the light shielding film 4.
- the black fine particles are blended for coloring the binder resin black and imparting light shielding properties to the coating film (light shielding film 4) after drying.
- the black fine particles include carbon black, titanium black, aniline black, and iron oxide.
- carbon black is particularly preferably used because it can simultaneously impart both light shielding properties and antistatic properties to the coating film.
- antistatic properties are required in addition to the light shielding property is that, after the light shielding material 1 is manufactured, when the die is cut into a predetermined shape, or the product (light shielding member) after die cutting is set as a part in the optical apparatus. In consideration of workability.
- a conductive agent or an antistatic agent can be separately added in addition to the black fine particles.
- the average particle diameter of the black fine particles is preferably as fine as possible.
- those having an average particle diameter of, for example, less than 1 ⁇ m, preferably 500 nm or less can be used.
- the content of the black fine particles is preferably 5% by weight to 20% by weight, more preferably 10% by weight to 20% by weight in the nonvolatile content (solid content) contained in the coating liquid.
- the content is easy to prevent a decrease in light shielding property as a necessary physical property of the light shielding film 4.
- the adhesion and scratch resistance of the light-shielding film 4 are improved, and it is easy to prevent a decrease in coating film strength and an increase in cost.
- the matting agent includes an organic type and an inorganic type, but in the present embodiment, it is preferable to use organic fine particles.
- organic fine particles include cross-linked acrylic beads (transparent or uncolored).
- examples of the inorganic fine particles include silica, magnesium aluminate metasilicate, and titanium oxide.
- inorganic fine particles may be used.
- organic fine particles are preferably used in the present embodiment because organic fine particles are easier to impart a perfect matting performance while maintaining the coating strength.
- “using organic fine particles” includes not only using organic fine particles but also using inorganic fine particles together with organic fine particles.
- the content of organic fine particles in all matting agents can be, for example, 90% by weight or more, preferably 95% by weight or more.
- a CV value coefficient of variation in particle size distribution
- a matting agent preferably organic fine particles
- a CV value at a certain particle size 20 or more, preferably 25 or more, more preferably 30 or more
- the surface properties of the light shielding film 4 can be easily adjusted to those described above.
- a mixture of one having an average particle diameter and another having an average particle diameter can be used as the matting agent regardless of the CV value described above.
- the average particle diameter of one of the matting agents may be in the above range (35% to 110% of Tt) with respect to the film thickness Tt of the light shielding film 4 to be formed.
- a matting agent having an average particle size within the above range can be used in combination.
- the film thickness Tt means an arithmetic average value obtained by measuring the dried light-shielding film 4 with a Millitron 1202-D (manufactured by Marl) film thickness meter at 10 points while changing the location of the light-shielding film 4.
- the average particle diameter refers to a median diameter (D50) measured by a laser diffraction particle size distribution measuring apparatus (for example, Shimadzu Corporation: SALD-7000).
- the content of the matting agent is 50 parts by weight or more, preferably 60 parts by weight or more, more preferably 70 parts by weight or more, and 170 parts by weight or less, preferably 140 parts by weight or less with respect to 100 parts by weight of the binder resin. More preferably, it can be 110 parts by weight or less.
- solvent water, an organic solvent, a mixture of water and an organic solvent, or the like can be used.
- hydrocarbon lubricants such as polyethylene wax and paraffin wax
- fatty acid lubricants such as stearic acid and 12-hydroxystearic acid
- amide lubricants such as oleic acid amide and erucic acid amide
- ester lubricants such as stearic acid monoglyceride
- solid lubricants such as alcohol-based lubricants, metal soaps, talc, and molybdenum disulfide
- silicone resin particles fluorine resin particles such as polytetrafluoroethylene wax, crosslinked polymethyl methacrylate particles, and crosslinked polystyrene particles.
- a particulate lubricant When blending a particulate lubricant, it is particularly preferable to use an organic lubricant.
- a fluorine compound, silicone oil, or the like when blending a lubricant, it is preferable to use a liquid at room temperature. This is because a liquid lubricant is unlikely to affect the formation of the irregular shape on the surface of the light shielding film by the matting agent.
- a flame retardant In the coating solution for forming the light shielding film, a flame retardant, an antibacterial agent, an antifungal agent, an antioxidant, a plasticizer, a leveling agent, a flow control, if necessary, as long as the function of the present invention is not impaired. It is also possible to add additives such as an agent, an antifoaming agent and a dispersing agent.
- the base material 2 is not only transparent, but also a foamed polyester film, a synthetic resin film containing a black pigment such as carbon black, and other pigments, and a thin film metal that has a light shielding property and strength on the base material itself.
- a board can also be used.
- the base material 2 can select an appropriate thing according to each use. For example, when using as the light-shielding material 1, if a high light-shielding property is required, a synthetic resin film or a thin metal plate containing black fine particles of the same kind as those described later can be used. In, a transparent or foamed synthetic resin film can be used.
- the light-shielding film 4 of the present embodiment can provide a sufficient light-shielding property as a light-shielding material by itself, when the synthetic resin film contains black fine particles, the synthetic resin film looks black visually. That is, it may be contained so that the optical transmission density is about 2.
- the base material 2 a material whose surface is matted by sandblasting, embossing or the like (regardless of whether it is a synthetic resin film or a metal plate) can be used.
- the thickness of the substrate 2 varies depending on the application to be used, it is generally set to about 6 ⁇ m to 250 ⁇ m from the viewpoint of strength and rigidity as the light-shielding material 1. From the viewpoint of improving the adhesion to the light shielding film 4, the substrate 2 can be subjected to anchor treatment, corona treatment, plasma treatment or EB treatment as necessary.
- the coating method of the coating solution is not particularly limited, and can be performed by a conventionally known method (for example, dip coating, roll coating, bar coating, die coating, blade coating, air knife coating, etc.).
- the coating liquid prepared in this embodiment has a specific gravity of about 0.9 to 1.2, and its solid content (NV) is usually 5% or more, preferably 10% or more, and usually 40%. Hereinafter, it is preferably adjusted to about 30% or less.
- the coating solution is usually 6 g / m 2 or more, preferably 8 g / m 2 or more, more preferably 10 g / m 2 or more, and is usually 100 g / m 2 or less, preferably 80 g / m 2 or less, more preferably 60 g. It is applied on the substrate 2 with an adhesion amount of about / m 2 or less.
- the light shielding material 1 for an optical device according to the present embodiment is obtained.
- the surface property of the light shielding film 4 is appropriately adjusted. Therefore, the light shielding film 4 has a wide low gloss region (G20, G60, and G85). All of them are low), providing a perfect matting effect. Specifically, the 60-degree specular gloss (G60) of the surface of the light shielding film 4 is adjusted to less than 1 and the 85-degree specular gloss (G85) is adjusted to less than 15. Further, since the light shielding film 4 contains a binder resin and black fine particles, it retains necessary physical properties such as light shielding properties.
- the perfect matting effect described above is particularly effective for applications where the light shielding film 4 is required to be thin (for example, about 6 ⁇ m or less).
- a camera imaging device
- a plurality of lenses are used for a lens portion of a photographing optical system, and an extremely thin spacer is incorporated between each lens.
- This is particularly effective when the light shielding material 1 according to the present embodiment is applied to the inner wall of the optical system.
- the present invention can be applied to components such as shutters and diaphragms that have been used conventionally.
- a method of filling a resin mixture containing black fine particles in a cavity of a mold apparatus having a male mold and a female mold and performing transfer molding is conceivable.
- a surface property satisfying at least one of the conditions A1 and A2 and at least one of the conditions B1 and B2 is simulated in advance so that it is transferred to the molded product after molding (an example).
- a mold is prepared by finely processing the inner surface of one or both molds.
- the resin mixture is filled into a cavity formed inside by closing the mold and cured.
- the mold is removed from the mold to obtain a molded product corresponding to the light shielding material of the present invention.
- the light-shielding material for optical equipment of the present invention can be produced.
- the light shielding material 1 having the light shielding film 4 whose surface properties are adjusted once is manufactured by the method described in the present embodiment. After molding the surface properties of the light-shielding film 4 and finely processing the inner surface of the mold, a molded product can be manufactured by a transfer molding method using the mold.
- each of the matting agents X1 and X2 is a transparent acrylic bead having an average particle size of 5 ⁇ m, but the coefficient of variation (CV value) of the particle size distribution is different.
- the CV value is a broad product with a matting agent X1 of 31.4 and a sharp product with a matting agent X2 of 8.45.
- the matting agents X3, X4, and X5 are all transparent acrylic beads having an average particle diameter of 8 ⁇ m, but each has a different particle size distribution CV value.
- the CV values are a broad product with a matting agent X3 of 34.6, an intermediate product with a matting agent X4 of 17.8, and a sharp product with a matting agent X5 of 7.84.
- the matting agents X1 and X2 may also be referred to as transparent 5 ⁇ m broad and transparent 5 ⁇ m sharp, respectively.
- the matting agents X3, X4, and X5 may be referred to as transparent 8 ⁇ m broad, transparent 8 ⁇ m intermediate, and transparent 8 ⁇ m sharp, respectively.
- each coating solution of the above-mentioned experimental examples is attached to 14 g / m 2 on one side of a transparent polyethylene terephthalate film (Lumirror T60: Toray Industries, Inc.) having a thickness of 25 ⁇ m. A sample formed by coating and drying was used.
- Tables 3 and 4 descriptions indicating the satisfaction of the surface property conditions of the light-shielding film in each sample (in the table, ⁇ is satisfied, ⁇ is not satisfied) are also shown.
- the measured value was less than 0.3 “ ⁇ ”, the measured value was 0.3 or more and less than 0.5, “ ⁇ ”, and the measured value was 0.5 or more and less than 0.7. “O” was 0.7 or higher, and “X” was assigned.
- the measurement value of less than 0.5 was “ ⁇ ”
- the measurement value of 0.5 or more and less than 0.7 was “ ⁇ ”
- the measurement value of 0.7 or more and less than 1 was “ ⁇ ”. What was 1 or more was set as "x”.
- G85 those whose measured values were less than 8 were “ ⁇ ”, those who were 8 or more and less than 10 were “ ⁇ ”, those who were 10 or more but less than 15 were “ ⁇ ”, those who were 15 or more were “ ⁇ ”.
- the surface property of the light shielding film satisfies at least one of A1 and A2 and at least one of B1 and B2 (Experimental Example 1-1 to Experimental Example 1-3, Experimental Example 3-1, Experimental Example) As for 3-2), excellent results were obtained for G85 as well as G20 and G60 with regard to matte properties.
- Example 6 Under the same conditions as in Experimental Example 1-1, except that the coating liquid f was prepared by blending the coating liquid a used in Experimental Example 1-1 with 3% silicone oil as a liquid lubricant. Then, a light shielding film F was formed on the substrate, and a light shielding material sample of Experimental Example 6 was produced. Thereafter, the matte properties were evaluated under the same conditions as in Experimental Example 1-1. Despite the fact that the same performance as in Experimental Example 1-1 was obtained, compared with Experimental Example 1-1, It was confirmed that the mobility was better.
- the coefficient of static friction ( ⁇ s) is 0.35 or less and the coefficient of dynamic friction ( ⁇ k) is 0.25 or less, which improves the slidability without affecting the surface properties of the light shielding film. I was able to.
- ⁇ s and ⁇ k in this example are values measured based on JIS-K7125: 1999 under conditions of weight: 200 g and speed: 100 mm / min.
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- General Physics & Mathematics (AREA)
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- Laminated Bodies (AREA)
- Diaphragms For Cameras (AREA)
- Shutters For Cameras (AREA)
Abstract
Description
条件A2:三次元表面粗さ測定における十点平均粗さをSzとしたとき、Szの値が1以上20以下となる条件、
条件B1:三次元表面粗さ測定における凹凸の中心平面を基準面とし、この基準面からSaのn倍の高さ位置にある平面に突出する突起数をPnとし、Saの(n+1)倍の高さ位置にある平面に突出する突起数をPn+1 とし、PnとPn+1 の比(Pn+1 /Pn)をRnとしたとき(但し、nはいずれも正の整数である。)、R1が55%以上で、かつR4が7%以上となる条件、
条件B2:条件B1と同じく、Pn、Pn+1 、Rnとしたとき、少なくともR1が55%以上、R2が15%以上、及びR3が8%以上となる条件。
図1~図3に示すように、本実施形態に係る光学機器用遮光材1は、例えばカメラ(カメラ付き携帯電話を含む)やプロジェクタなどの光学機器の遮光部品用途に好適に使用しうるものであり、基材2を有する。図1~図3に示す例では、基材2の片面に遮光膜4が形成されている。なお、本発明では基材2の両面に、遮光膜4が形成される態様を含む。
具体的には、まず、遮光膜4の三次元表面粗さ測定における、算術平均粗さをSaとし、十点平均粗さをSzとする。なお、ここでのSa及びSzは、JIS-B0601(1994)における二次元表面粗さの算術平均粗さ(Ra)及び十点平均粗さ(Rz)の測定方法に準じ、これを三次元に拡張したものである。 例えば触針式表面粗さ測定機(SURFCOM 1500SD2-3DF:東京精密社)により測定できる。
・A1及びB1
・A2及びB1
・A1、A2及びB1
・A1及びB2
・A2及びB2
・A1、A2及びB2
・A1、B1及びB2
・A2、B1及びB2
・A1、A2、B1及びB2
本実施形態の条件B2は、好ましくは、さらにR4が7%以上となる条件を含む。
本実施形態では、遮光膜4の表面性状が適切に調整されているので、遮光膜4には低光沢度領域の広い万全な艶消し効果が付与される。その結果、本実施形態の遮光材1を適用した光学機器内においてゴーストと呼ばれる不具合を生じることはない。
なお、ここで、大きな凹凸のみを存在させることによりG20、G60、G85のすべてを低くする手段も考えられるが、大きな凹凸のみで遮光膜を形成すると必然的に膜厚も大きくならざるを得ず、近年の薄膜化の情勢に逆行することになる。
なお、黒色微粒子としてカーボンブラックを用いない場合には、黒色微粒子の他に、別途、導電剤や帯電防止剤を配合することも可能である。
塗膜に充分な遮光性を付与するために、黒色微粒子の平均粒径は細かいほど好ましい。本実施形態では、平均粒径が例えば1μm未満、好ましくは500nm以下のものを用いることができる。
平均粒径とは、レーザー回折式粒度分布測定装置(例えば、島津製作所社:SALD-7000など)で測定されるメディアン径(D50)を指す。
なお、基材2としては、サンドブラスト、エンボス処理などで表面がマット状とされたもの(合成樹脂フィルム、金属板の別は不問)を用いることもできる。
[実験例1-1~5-2]
基材として、厚み25μmの黒色PETフィルム(ルミラーX30:東レ社)を使用し、その両面に、下記処方の塗布液a~eをそれぞれバーコート法により塗布した。各塗布液のアクリルポリオール等の含有量(部、固形分換算)を表1に示す。各塗布液の固形分はいずれも20%に調製した。
・アクリルポリオール(固形分50%) 153.8部
(アクリディックA807:DIC社)
・イソシアネート(固形分75%) 30.8部
(バーノックDN980:DIC社)
・カーボンブラック(平均粒径25nm) 24部
(トーカブラック#5500:東海カーボン社)
・表1記載のマット剤 (表1記載の部)
・メチルエチルケトン、トルエン 611.4~1091.4部
各実験例で得られた遮光材サンプルに対し、触針式表面粗さ測定機(SURFCOM 1500SD2-3DF:東京精密社)を使用し、下記条件にて、遮光膜表面の、三次元の算術平均粗さ(Sa)及び十点平均粗さ(Sz)を測定した。結果を表2に示す。
・触針先端半径:2μm、
・触針先端のテーパ角度:60度、
・測定力:0.75mN、
・カットオフ値λc:0.8mm、
・測定速度:0.6mm/s、
・基準長さ:0.8mm、
・測定領域:4mm×0.5mm。
各実験例で得られた遮光材サンプルに対し、ます遮光膜表面に存在する凹凸の中心平面を導き出し、これを基準面Fb(図3参照)とした。なお、中心平面は、次の考え方で導き出した。基準面Fbより上側にある凸部(山部)の体積と、基準面Fbより下側にある凹部(谷部)の容積が同じになるように平坦化した時の、想定された完全平面を意味し、Sa高さやSzの基準面となるものである。例えば本実験例で使用した触針式表面粗さ測定機では、上記測定条件で測定することにより計算で基準面が設定される。
なお、表2には、各サンプルにおける基準面Fbからの平面の高さ(単位:μm)の他、表1の塗布液の付着量、形成した遮光膜の膜厚なども併記した。
各実験例で得られた遮光材サンプルについて、下記の方法で物性の評価をした。結果を表3及び表4に示す。ただし、下記(1)遮光性の評価については、厚み25μmの透明ポリエチレンテレフタレートフィルム(ルミラーT60:東レ社)の片面に、上記各実験例の処方の各塗布液を付着量14g/m2 になるように塗布、乾燥して形成したサンプルを用いて行った。
なお、表3及び表4には、各サンプルにおける遮光膜の表面性状条件の充足具合を示す記載(表中、○は満足する、×は満足しない)を併記した。
各実験例のサンプルの光学透過濃度を、JIS-K7651:1988に基づき光学濃度計(TD-904:グレタグマクベス社)を用いて測定した。その結果、測定値が4.0を超えたものを「○」、4.0以下だったのものを「×」とした。なお、光学濃度の測定はUVフィルターを用いた。
各実験例で得られた遮光材サンプルの表面抵抗率(Ω)を、JIS-K6911:1995に基づき測定した。測定値が1.0×106 Ω以下だったものを「○」、1.0×106 Ωを超えて1.0×1010Ω以下だったものを「△」、1.0×1010Ωを超えたものを「×」とした。
各実験例で得られた遮光材サンプルに対し、その遮光膜表面の、20度、60度及び85度の各鏡面光沢度(G20、G60、G85)を、JIS-Z8741:1997に基づき光沢計(商品名:VG-2000、日本電色工業社)を用いて測定した(単位は%)。
表3及び表4から以下のことが理解できる。すべての実験例において、形成した遮光膜の遮光性、導電性は良好であった。しかしながら、遮光膜の表面性状がB1及びB2の何れも満足しないもの(実験例2-1~実験例2-3、実験例4-1~実験例5-2)は、艶消し性においてG85の評価が低かった。
実験例1-1で使用した塗布液a中に、液状の滑剤としてのシリコーンオイルが3%となるように配合して塗布液fを調製した以外は、実験例1-1と同様の条件で、基材上に遮光膜Fを形成し、実験例6の遮光材サンプルを作製した。
その後、実験例1-1と同様の条件で艶消し性を評価したところ、実験例1-1の場合と同等の性能が得られたにもかかわらず、実験例1-1と比較して摺動性がより優れていることが確認できた。具体的には、静摩擦係数(μs)が0.35以下であって動摩擦係数(μk)が0.25以下であり、遮光膜の表面性状に影響を与えることなく、摺動性を向上することができた。
なお、本例でのμsとμkは、JIS-K7125:1999に基づき、加重:200g、速度:100mm/分の条件で測定した値である。
Claims (5)
- 遮光膜を有する光学機器用遮光材において、
前記遮光膜は、下記条件A1及び条件A2の少なくとも何れかと、下記条件B1及び条件B2の少なくとも何れかとを満たすように、表面性状が調整してある光学機器用遮光材。
条件A1:三次元表面粗さ測定における算術平均粗さをSaとしたとき、Saの値が0.4以上2.0以下となる条件、
条件A2:三次元表面粗さ測定における十点平均粗さをSzとしたとき、Szの値が1以上20以下となる条件、
条件B1:三次元表面粗さ測定における凹凸の中心平面を基準面とし、この基準面からSaのn倍の高さ位置にある平面に突出する突起数をPnとし、Saの(n+1)倍の高さ位置にある平面に突出する突起数をPn+1 とし、PnとPn+1 の比(Pn+1 /Pn)をRnとしたとき(但し、nはいずれも正の整数である。)、R1が55%以上で、かつR4が7%以上となる条件、
条件B2:条件B1と同じく、Pn、Pn+1 、Rnとしたとき、少なくともR1が55%以上、R2が15%以上、及びR3が8%以上となる条件。 - 請求項1記載の光学機器用遮光材において、
前記遮光膜は、少なくともバインダー樹脂、黒色微粒子及びマット剤を含んで構成されており、基材上に積層してある光学機器用遮光材。 - 請求項1又は2記載の光学機器用遮光材において、
前記条件B2は、さらにR4が7%以上となる条件を含む、光学機器用遮光材。 - 請求項1~3の何れか一項記載の遮光材を使用した光学部品。
- 請求項4記載の光学部品を含む撮像装置。
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US9383484B2 (en) | 2016-07-05 |
CN103460080A (zh) | 2013-12-18 |
TW201239412A (en) | 2012-10-01 |
JPWO2012132727A1 (ja) | 2014-07-24 |
JP5876869B2 (ja) | 2016-03-02 |
KR20140027181A (ko) | 2014-03-06 |
US20140016202A1 (en) | 2014-01-16 |
CN103460080B (zh) | 2015-07-15 |
KR101828121B1 (ko) | 2018-02-09 |
TWI556012B (zh) | 2016-11-01 |
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