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WO2012005147A1 - Light-blocking member for optical instrument - Google Patents

Light-blocking member for optical instrument Download PDF

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Publication number
WO2012005147A1
WO2012005147A1 PCT/JP2011/064866 JP2011064866W WO2012005147A1 WO 2012005147 A1 WO2012005147 A1 WO 2012005147A1 JP 2011064866 W JP2011064866 W JP 2011064866W WO 2012005147 A1 WO2012005147 A1 WO 2012005147A1
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WO
WIPO (PCT)
Prior art keywords
light
light shielding
shielding member
film
fine particles
Prior art date
Application number
PCT/JP2011/064866
Other languages
French (fr)
Japanese (ja)
Inventor
堀川　晃
正裕 原田
Original Assignee
株式会社 きもと
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社 きもと filed Critical 株式会社 きもと
Priority to CN2011800340050A priority Critical patent/CN102985854A/en
Priority to JP2012523827A priority patent/JP5984667B2/en
Priority to KR1020127029311A priority patent/KR20130059341A/en
Publication of WO2012005147A1 publication Critical patent/WO2012005147A1/en

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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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/044—Forming conductive coatings; Forming coatings having anti-static properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers

Definitions

  • the present invention relates to a light-shielding member for optical equipment that can be used for shutters and diaphragm members of various optical equipment.
  • the above-described light-shielding film is extremely weak compared to a light-shielding member made of a metal material. Therefore, if the light-shielding film is used as a shutter or a diaphragm member of an optical device, it cannot be used and is in contact with other members. There has been a problem that distortion occurs from the part, and deformation or damage occurs. Such a problem can be said to be a big problem in the recent situation where thinning is required.
  • the light shielding member made of a metal material
  • deformation easily occurs due to contact with other members. Such deformation does not return to the original due to the nature of the metal material, and such a light shielding member is not convenient.
  • Metal materials are more expensive than plastic materials in the first place.
  • the inventors of the present invention provide a light shielding member including a binder resin having a hydroxyl value of 100 (mgKOH / g) or more as a binder resin and fine particles having an average particle diameter of less than 1 ⁇ m in the light shielding film.
  • the light shielding member for optical equipment of the present invention includes a base material made of a synthetic resin film and a light shielding film formed on at least one surface of the base material, and the light shielding film has a hydroxyl value of 100. It is characterized by containing a binder resin that is (mg KOH / g) or more, carbon black, and fine particles having an average particle diameter of less than 1 ⁇ m.
  • the fine particles are preferably inorganic fine particles.
  • the inorganic fine particles are preferably calcium carbonate.
  • the light shielding film preferably contains silica.
  • the light-shielding film contains a binder resin having a hydroxyl value of 100 (mgKOH / g) or more and fine particles having an average particle diameter of less than 1 ⁇ m. It is possible to provide a light shielding member that is less likely to be damaged.
  • the light shielding member of the present invention includes a base material made of a synthetic resin film and a light shielding film formed on at least one surface of the base material.
  • the light-shielding film contains a binder resin having a hydroxyl value of 100 (mgKOH / g) or more, carbon black, and fine particles having an average particle diameter of less than 1 ⁇ m.
  • the average particle diameter as used in the field of this invention refers to the median diameter (D50) measured with a laser diffraction type particle size distribution measuring apparatus (for example, Shimadzu Corporation SALD-7000).
  • Base materials made of synthetic resin film include polyester, ABS (acrylonitrile-butadiene-styrene), polyimide, polystyrene, polycarbonate, acrylic, polyolefin, cellulose resin, polysulfone, polyphenylene sulfide, polyethersulfone, polyetheretherketone, etc. Things.
  • a polyester film is preferably used, and a stretched polyester film, particularly a biaxially stretched polyester film, is particularly preferable in terms of excellent mechanical strength and dimensional stability.
  • a base material a transparent polyester, a foamed polyester film, a black pigment such as carbon black, and a synthetic resin film containing other pigments can be used.
  • the above-mentioned base material can be selected appropriately for each application.
  • a black pigment such as carbon black
  • the contained synthetic resin film can be used, and in other cases, a transparent or foamed synthetic resin film can be used.
  • the light shielding film itself provides sufficient light shielding properties as a light shielding member. Therefore, when the synthetic resin film contains a black pigment, the synthetic resin film looks visually black, that is, optical. It may be contained so that the concentration is about 3. Therefore, since the black pigment is not contained in the synthetic resin film until the limit that the physical properties as the base material are impaired as in the prior art, it can be obtained at low cost without changing the physical properties of the synthetic resin film.
  • the thickness of the substrate is preferably 4 to 50 ⁇ m, and more preferably 4 to 38 ⁇ m from the viewpoint of reducing the thickness.
  • an anchor process or a corona process can also be performed to a base material as needed from a viewpoint of improving adhesiveness with a light shielding film.
  • the light-shielding film formed on at least one surface of the substrate contains a binder resin having a hydroxyl value of 100 (mgKOH / g) or more, carbon black, and fine particles having an average particle diameter of less than 1 ⁇ m.
  • the particles are small and tend to aggregate with each other. As a result, such fine particles cannot be uniformly dispersed in the binder resin and are present in an uneven manner.
  • the light shielding film is formed of such a material, a portion having a low density of fine particles is easily formed in the light shielding film, and a portion that is easily deformed locally is formed in the light shielding film. If the light shielding member provided with the light shielding film is used for a certain period of time, it is considered that bending or distortion occurs from a portion that is easily deformed, so that the stiffness is not necessarily strong.
  • fine particles having an average particle diameter of less than 1 ⁇ m are used in a binder resin having a hydroxyl value of 100 (mg KOH / g) or more, the fine particles are locally aggregated due to the influence of the hydroxyl value of the binder resin. Without being dispersed. As a result, the dispersion balance of the fine particles is suitable for the entire light-shielding film, and even when used as a light-shielding member, local deflection and distortion are unlikely to occur, and it can be considered that the stiffness is strong.
  • binder resins having a hydroxyl value of 100 (mgKOH / g) or more include poly (meth) acrylic acid resins, polyester resins, polyvinyl acetate resins, polyvinyl chloride, polyvinyl butyral resins, cellulose resins, and polystyrene / polybutadiene resins.
  • thermoplastic resins such as urea-based resins and diallyl phthalate-based resins, and thermosetting resins. These can be used alone or in combination.
  • the hydroxyl value of the binder resin is 100 (mgKOH / g) or more.
  • the hydroxyl value of the binder resin is preferably 125 (mgKOH / g) or more, and more preferably 200 (mgKOH / g) or more, from the viewpoint of further exerting stiffness.
  • an upper limit it is preferable to set it as 250 (mgKOH / g) or less from a viewpoint of preventing that a bending stress falls and a coating film becomes weak.
  • the content of the binder resin having a hydroxyl value of 100 (mgKOH / g) or more is preferably 15% by weight or more, more preferably 20% by weight or more in the light shielding film.
  • the content of the binder resin in the light shielding film is preferably 50% by weight or less, more preferably 45% by weight or less, and still more preferably 40% by weight or less.
  • the carbon black contained in the light-shielding film is for coloring the binder resin black to impart light-shielding properties and to impart electrical conductivity to prevent electrostatic charging.
  • the average particle size of carbon black is preferably 1 ⁇ m or less, and more preferably 0.5 ⁇ m or less in order to obtain sufficient light shielding properties.
  • the content of carbon black is preferably 10 to 50% by weight, more preferably 15 to 45% by weight in the light shielding film.
  • the content of the light shielding film is 10% by weight or more, it is possible to prevent the light shielding property and conductivity from being deteriorated, and when the content is 50% by weight or less, the adhesiveness and scratch resistance are improved. It is possible to prevent a decrease in film strength and an increase in cost.
  • the light-shielding film is formed with fine irregularities on the surface to reduce the reflection of incident light, lower the surface glossiness (mirror glossiness), and improve the matte properties when used as a light-shielding member.
  • inorganic particles may be included. Examples of inorganic particles include silica, magnesium aluminate metasilicate, and titanium oxide. Among these, silica is preferably used from the viewpoints of particle dispersibility, low cost, and the like.
  • the average particle diameter of the inorganic particles is preferably 1 ⁇ m to 10 ⁇ m, and more preferably 1 ⁇ m to 6 ⁇ m. By setting it as such a range, a fine unevenness
  • the content of the inorganic particles is preferably 0.5 to 10% by weight, more preferably 0.5 to 5% by weight in the light shielding film.
  • the content is preferably 0.5 to 10% by weight, more preferably 0.5 to 5% by weight in the light shielding film.
  • the content is possible to prevent the inorganic particles from dropping off due to the sliding of the light shielding member, or to prevent the light shielding member itself from being damaged, and to prevent the sliding property from being deteriorated. it can.
  • the content of inorganic particles is preferably 5% by weight or less in the light shielding film from the above range.
  • the inorganic particles used in the present embodiment can obtain a high matte property even in a small amount. Therefore, by setting the amount to 5% by weight or less, a sufficient matte property can be obtained, and relatively, carbon black can be obtained. Thus, it becomes possible to increase the content of fine particles, which will be described later, and to improve physical properties such as light shielding properties and electrical conductivity without lowering the stiffness.
  • the fine particles having an average particle size of less than 1 ⁇ m contained in the light shielding film are used in combination with the binder resin having a hydroxyl value of 100 (mgKOH / g) or more as described above. Therefore, even if it is used as a light shielding member, it is difficult for local deflection and distortion to occur, and it can be strong. Moreover, the hardness of the coating film when it is set as the light shielding film can also be improved. Furthermore, since it is difficult for local deflection and distortion to occur, thermal deformation can hardly occur.
  • 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
  • stearic acid examples thereof include 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, and stearic acid.
  • Mono-glyceride ester lubricants Mono-glyceride ester lubricants, alcohol lubricants, silicone resin particles, fluororesin particles such as polytetrafluoroethylene wax, acrylic resin particles, cross-linked acrylic resin particles, cross-linked polystyrene resin particles and other resin fine particles, or metal soap , Talc, molybdenum disulfide, calcium carbonate, silica, aluminum hydroxide, zirconium oxide, barium sulfate, titanium oxide, and other inorganic fine particles such as solid lubricants.
  • inorganic fine particles it is preferable to use calcium carbonate because it is stronger as a light shielding member. These fine particles can be used alone or in combination of two or more.
  • the silica enumerated here is different from the silica contained in order to improve the above-mentioned matting property.
  • the content of the fine particles is preferably 2.5 to 40% by weight, more preferably 10 to 35% by weight in the light shielding film.
  • the stiffness can be made stronger, and by making it 40% by weight or less, the relative content of carbon black can be increased, while obtaining the stiffness. It can prevent that light-shielding property falls.
  • the content of the fine particles with respect to the binder resin is preferably 30 to 200 parts by weight, more preferably 50 to 150 parts by weight with respect to 100 parts by weight of the binder resin.
  • a flame retardant an antibacterial agent, a fungicide, an antioxidant, a plasticizer, a leveling agent, a flow regulator, Various additives such as an antifoaming agent and a dispersing agent can be contained.
  • the thickness of the light shielding film is preferably 3 ⁇ m to 30 ⁇ m, and more preferably 5 ⁇ m to 20 ⁇ m. By setting the thickness to 3 ⁇ m or more, it is possible to prevent pinholes and the like from being generated in the light shielding film and to obtain sufficient light shielding properties. Moreover, it can prevent that a crack arises in a light shielding film by setting it as 30 micrometers or less.
  • the light-shielding member for an optical device includes a binder resin having a hydroxyl value of 100 (mgKOH / g) or more, carbon black, and fine particles having an average particle diameter of less than 1 ⁇ m on one or both surfaces of a substrate.
  • a coating solution for a light-shielding film including a dip coat, a roll coat, a bar coat, a die coat, a blade coat, an air knife coat and the like is applied and dried, followed by heating and pressurizing as necessary. Can be obtained.
  • the solvent of the coating solution water, an organic solvent, a mixture of water and an organic solvent, or the like can be used.
  • the light-shielding member for an optical device includes a specific light-shielding film on at least one surface of the base material, the light-shielding property and the properties of the light-shielding film such as conductivity are maintained. It can be suitably used as a shutter and diaphragm member for optical devices such as high-performance single-lens reflex cameras, compact cameras, video cameras, mobile phones, and projectors.
  • the light shielding film of this embodiment contains a binder resin having a hydroxyl value of 100 (mgKOH / g) or more and fine particles having an average particle diameter of less than 1 ⁇ m, the fine particles are uniform in the light shielding film. Therefore, it is possible to provide a light-shielding member that is stiff even if it is thinned and hardly breaks the film. As a result, it is particularly preferably used for shutters, diaphragm members, and the like of camera-equipped mobile phones that have recently been required to be thin. Furthermore, since local deflection and distortion are unlikely to occur, thermal deformation can hardly occur.
  • Example 1 A black polyethylene terephthalate film (Lumirror X30: Toray Industries, Inc.) having a thickness of 25 ⁇ m is used as a base material, and a coating solution for a light-shielding film having the following formulation is applied to both surfaces of the base material by a bar coating method, respectively, and the thickness when dried is 10 ⁇ m.
  • the light shielding film was formed by coating and drying, and the light shielding member for optical equipment of Example 1 was produced.
  • Polyester polyol 9.68 parts (Bernock 11-408: DIC Corporation, hydroxyl value 200 (mgKOH / g), solid content 70%) ⁇ Isocyanate 9.37 parts (Bernock DN980: DIC, solid content 75%) ⁇ 4.57 parts of carbon black (Vulcan XC-72: Cabot) ⁇ Silica 0.89 parts (TS100: Evonik Degussa Japan, average particle size 4 ⁇ m) -Fine particles (calcium carbonate) 7.50 parts (Sunlite SL-700: Takehara Chemical Industries, average particle size 0.74 ⁇ m) ⁇ Methyl ethyl ketone 36.93 parts ⁇ Toluene 15.83 parts
  • Example 2 Of the coating solution for light-shielding film used in Example 1, the polyester polyol was changed to polyester polyol (Bernock J-517: DIC, hydroxyl value 140 (mgKOH / g), solid content 70%), and the amount of isocyanate added A light-shielding member for optical equipment of Example 2 was produced in the same manner as Example 1 except that was changed to 6.56 parts by weight.
  • Example 3 Of the coating solution for light-shielding film used in Example 1, the polyester polyol was changed to a polyester polyol (Bernock D-144-65BA: DIC, hydroxyl value 100 (mgKOH / g), solid content 65%) and added. Was made in the same manner as in Example 1 except that the amount of isocyanate added was 5.04 parts by weight, and a light-shielding member for optical equipment of Example 3 was produced.
  • Example 4 Of the coating solution for the light-shielding film used in Example 1, fine particles (calcium carbonate) were changed to fine particles (titanium oxide, A-100: Ishihara Sangyo Co., Ltd., average particle size 0.15 ⁇ m). Thus, a light shielding member for optical equipment of Example 4 was produced.
  • Example 5 Of the coating solution for the light-shielding film used in Example 1, fine particles (calcium carbonate) were changed to fine particles (acrylic particles, Chemisnow MP-1600: Soken Chemical Co., Ltd., average particle size 0.8 ⁇ m), and the same as in Example 1. Thus, a light shielding member for optical equipment of Example 5 was produced.
  • Comparative Example 1 Of the coating solution for the light-shielding film used in Example 1, the polyester polyol was changed to an acrylic polyol (Acridic A-801P: DIC, hydroxyl value 50 (mgKOH / g), solid content 50%), and the addition amount was changed.
  • a light shielding member for optical equipment of Comparative Example 1 was produced in the same manner as in Example 1 except that the amount was 13.55 parts by weight and the amount of isocyanate added was 3.28 parts by weight.
  • Comparative Example 2 Of the coating solution for the light-shielding film used in Example 1, fine particles (calcium carbonate) were changed to particles (barium sulfate, BMH: Sakai Chemical Industry Co., Ltd., average particle size: 2.5 ⁇ m). Thus, a light shielding member for optical equipment of Comparative Example 2 was produced.
  • Light-shielding property The light-shielding member for optical equipment obtained in Examples 1 to 5 and Comparative Examples 1 and 2 was optically measured using an optical densitometer (TD-904: Gretag Macbeth) based on JIS K7651: 1988. Concentration was measured. The case where the optical density exceeded 4.0 and became the density of the non-measurable region was indicated as “ ⁇ ”, and the case where it was 4.0 or less was indicated as “X”. Note that a UV filter was used for the measurement. The measurement results are shown in Table 1.
  • the measuring unit 3 is a commercially available electronic balance (BX3200D: Shimadzu Corporation) and the upper fixing unit 2 and the gap between the measuring unit 3 and the upper fixing unit is 2 cm.
  • a measuring device 10 was prepared.
  • the cylindrical examples 1 to 5 having a diameter of about 3.2 cm and the samples 1 of the comparative examples 1 and 2 are placed on the cylindrical side surface.
  • the weighing amount of the electronic balance of the measuring unit 3 after 10 seconds due to the elastic force of the sample 1 was measured.
  • a light-shielding member for optical equipment was prepared in which the light-shielding films of Examples 1 to 5 and Comparative Examples 1 and 2 were provided on one surface of the substrate. It was cut into 10 cm ⁇ 10 cm in length and width and allowed to stand in an environment at 80 ° C. for 5 minutes, and the curl amount at the end was measured. The case where the total of the four corners of the curl amount was 0 mm or more and less than 30 mm was designated as “ ⁇ ”, and the case where it was 30 mm or more was designated as “X”. The measurement results are shown in Table 1.
  • Adhesiveness The adhesiveness between the light-shielding film and the base material of the light-shielding member for optical equipment obtained in the above Experimental Examples 1 to 5 and Comparative Examples 1 and 2 is determined by the cross-cut tape method in JIS 5600-5-6. Based on measurement and evaluation. The case where the surface texture of the cross section was peeled off by 10% or more was indicated as “X”, the case where it was 5% or more and less than 10% was indicated as “ ⁇ ”, and the case where it was less than 5% was indicated as “ ⁇ ”.
  • the light shielding member for optical equipment obtained in Examples 1 to 5 includes a base material made of a synthetic resin film and a light shielding film formed on at least one side of the base material. Since the light-shielding film contains a binder resin having a hydroxyl value of 100 (mgKOH / g) or more, carbon black, silica, and fine particles having an average particle diameter of less than 1 ⁇ m, the light-shielding property is obtained. Even if it is made thin, it can be strong, and it is excellent in durability, so that it is difficult to cause breakage of a film or the like.
  • the light shielding member for optical devices of Examples 1 and 2 has a hydroxyl value of 125 (mgKOH / g) or more of the binder resin, the strength of the stiffness is particularly high.
  • the light shielding member for equipment has a hydroxyl value of the binder resin of 200 (mgKOH / g) or more and uses calcium carbonate as fine particles, so that the stiffness is particularly high and the durability is particularly high. It became.
  • the light shielding member for optical equipment of Comparative Example 1 used a binder resin having a hydroxyl value of less than 100 (mgKOH / g), fine particles were not uniformly dispersed in the light shielding film, and the stiffness was weak. Moreover, this also made the durability poor.
  • the light shielding member for optical equipment of Comparative Example 2 used particles having an average particle diameter of 1 ⁇ m or more, the fine particles were not uniformly dispersed in the light shielding film, and the stiffness was weak. Moreover, this also made the durability poor.
  • the light-shielding film has a binder resin having a hydroxyl value of 100 (mgKOH / g) or more, carbon black, silica, and an average particle diameter of less than 1 ⁇ m. Because it contains fine particles, the dispersion of fine particles is suitable as a whole of the light shielding film, and even when the light shielding film is provided on one side of the substrate as a light shielding member, local deflection and distortion occur. It was difficult to cause thermal deformation.
  • the light shielding member for optical equipment obtained in Comparative Example 1 has a high pigment ratio in the light shielding film, and thus hardly undergoes thermal deformation due to the binder resin. However, since the pigment ratio is high and the fine particles are not uniformly dispersed, the adhesion with the substrate is poor.
  • the light shielding member for optical equipment obtained in Comparative Example 2 is the same as the light shielding member for optical equipment obtained in Example 1, but has the same pigment ratio in the light shielding film but has an average particle diameter of less than 1 ⁇ m. Therefore, fine particles were not uniformly dispersed in the coating film, resulting in local deflection and distortion, resulting in thermal deformation. Further, the adhesion with the substrate was inferior to that of Example 1.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Diaphragms For Cameras (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Shutters For Cameras (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

Disclosed is a light-blocking member that is for an optical instrument and that has resilience even when made thin, and of which rupture, etc. of a film is difficult to arise. The light-blocking member for an optical element contains: a substrate that comprises a synthetic resin film; and a light-blocking film that is formed on at least one surface of the aforementioned substrate. The aforementioned light-blocking film is characterized by containing: a binder resin of which the hydroxyl value is at least 100 (mg KOH/g); carbon black; and microparticles of which the average particle size is less than 1 µm. Also, the aforementioned microparticles are characterized by being inorganic microparticles.

Description

光学機器用遮光部材Light shielding member for optical equipment
　この発明は、各種光学機器のシャッターや絞り部材などに使用可能な光学機器用遮光部材に関する。 The present invention relates to a light-shielding member for optical equipment that can be used for shutters and diaphragm members of various optical equipment.
　近年、高性能一眼レフカメラ、コンパクトカメラ、ビデオカメラ等の各種光学機器に対する小型化、軽量化の要求により、金属材料により形成されていた光学機器のシャッターや絞り部材がプラスチック材料へと代わりつつある。このようなプラスチック材料の絞りとしては、カーボンブラック、滑剤、微粒子及びバインダー樹脂を含有する遮光膜をフィルム基材の上に形成した遮光性フィルムが知られている（特許文献１、２）。 In recent years, due to demands for reducing the size and weight of various optical devices such as high-performance single-lens reflex cameras, compact cameras, and video cameras, the shutters and diaphragm members of optical devices that have been made of metal materials are being replaced by plastic materials. . As a diaphragm for such a plastic material, a light-shielding film in which a light-shielding film containing carbon black, a lubricant, fine particles, and a binder resin is formed on a film substrate is known (Patent Documents 1 and 2).
特開平９－２７４２１８号公報JP-A-9-274218 ＷＯ２００６／０１６５５５号公報WO2006 / 016555
　上述した遮光性フィルムは、金属材料からなる遮光部材に比べてコシが極端に弱いため、当該遮光性フィルムを光学機器のシャッターや絞り部材として用いると使用に耐えられず、他の部材との接触部位からゆがみが生じ、変形或いは破損してしまうという問題が生じていた。このような問題は、薄型化が要求されている近年の状況では大きな課題といえる。 The above-described light-shielding film is extremely weak compared to a light-shielding member made of a metal material. Therefore, if the light-shielding film is used as a shutter or a diaphragm member of an optical device, it cannot be used and is in contact with other members. There has been a problem that distortion occurs from the part, and deformation or damage occurs. Such a problem can be said to be a big problem in the recent situation where thinning is required.
　これに対し、金属材料からなる遮光部材をそのまま薄型化させる手法も考えられるが、当該遮光部材をシャッターや絞り部材として用いると、他の部材との接触により変形が生じ易い。かかる変形は、金属材料の性質上元に戻ることがないため、このような遮光部材では使い勝手が良くない。また、金属材料はプラスチック材料に比べ、そもそもコスト高である。 On the other hand, a method of reducing the thickness of the light shielding member made of a metal material is also conceivable. However, when the light shielding member is used as a shutter or a diaphragm member, deformation easily occurs due to contact with other members. Such deformation does not return to the original due to the nature of the metal material, and such a light shielding member is not convenient. Metal materials are more expensive than plastic materials in the first place.
　このように、金属材料を用いることなく、薄型化させてもコシがあり、フィルムの破損等が生じ難い光学機器用遮光部材が求められている。 Thus, there is a need for a light-shielding member for an optical device that does not cause damage to the film and that does not easily cause damage even if it is thinned without using a metal material.
　本発明者らは、これに対し、遮光膜中にバインダー樹脂として水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂と、平均粒子径が１μｍ未満である微粒子を含んだ遮光部材とすることで、薄型化させてもコシがあり、他の部材と接触してもフィルムの破損等が生じ難いものとすることができることを見出し、本発明に至ったものである。 In contrast, the inventors of the present invention provide a light shielding member including a binder resin having a hydroxyl value of 100 (mgKOH / g) or more as a binder resin and fine particles having an average particle diameter of less than 1 μm in the light shielding film. Thus, the present invention has been found out that even if it is thinned, it is stiff, and even if it comes into contact with other members, the film can be hardly damaged.
　即ち、本発明の光学機器用遮光部材は、合成樹脂フィルムからなる基材と、前記基材の少なくとも片面に形成された遮光膜とを含むものであって、前記遮光膜は、水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂、カーボンブラック及び平均粒子径が１μｍ未満である微粒子を含有することを特徴とするものである。 That is, the light shielding member for optical equipment of the present invention includes a base material made of a synthetic resin film and a light shielding film formed on at least one surface of the base material, and the light shielding film has a hydroxyl value of 100. It is characterized by containing a binder resin that is (mg KOH / g) or more, carbon black, and fine particles having an average particle diameter of less than 1 μm.
　また、本発明の光学機器用遮光部材は、微粒子が好ましくは無機微粒子である。また、当該無機微粒子は、好ましくは炭酸カルシウムである。 In the light shielding member for optical equipment of the present invention, the fine particles are preferably inorganic fine particles. The inorganic fine particles are preferably calcium carbonate.
　また、本発明の光学機器用遮光部材は、好ましくは遮光膜がシリカを含むものである。 In the light shielding member for optical equipment of the present invention, the light shielding film preferably contains silica.
　上記発明によれば、遮光膜中に水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂及び平均粒子径が１μｍ未満である微粒子を含有させることにより、薄型化させてもコシがあり、フィルムの破損等が生じ難い遮光部材とすることができる。 According to the above invention, the light-shielding film contains a binder resin having a hydroxyl value of 100 (mgKOH / g) or more and fine particles having an average particle diameter of less than 1 μm. It is possible to provide a light shielding member that is less likely to be damaged.
光学機器用遮光部材のコシ強さを測定するための測定装置を説明する図The figure explaining the measuring apparatus for measuring the stiffness of the light-shielding member for optical instruments
　以下、本発明の光学機器用遮光部材（以下、「遮光部材」という場合もある）の実施の形態ついて説明する。
　本発明の遮光部材は、合成樹脂フィルムからなる基材と、前記基材の少なくとも片面に形成された遮光膜とを含むものである。当該遮光膜は、水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂、カーボンブラック及び平均粒子径が１μｍ未満である微粒子を含有する。 Hereinafter, an embodiment of a light shielding member for an optical device according to the present invention (hereinafter sometimes referred to as “light shielding member”) will be described.
The light shielding member of the present invention includes a base material made of a synthetic resin film and a light shielding film formed on at least one surface of the base material. The light-shielding film contains a binder resin having a hydroxyl value of 100 (mgKOH / g) or more, carbon black, and fine particles having an average particle diameter of less than 1 μm.
　なお、本発明でいう平均粒子径とは、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。 In addition, the average particle diameter as used in the field of this invention refers to the median diameter (D50) measured with a laser diffraction type particle size distribution measuring apparatus (for example, Shimadzu Corporation SALD-7000).
　合成樹脂フィルムからなる基材としては、ポリエステル、ＡＢＳ（アクリロニトリル－ブタジエン－スチレン）、ポリイミド、ポリスチレン、ポリカーボネート、アクリル、ポリオレフィン、セルロース樹脂、ポリスルホン、ポリフェニレンスルフィド、ポリエーテルスルホン、ポリエーテルエーテルケトン等からなるものが挙げられる。中でもポリエステルフィルムが好適に用いられ、延伸加工、特に二軸延伸加工されたポリエステルフィルムが機械的強度、寸法安定性に優れる点で特に好ましい。 Base materials made of synthetic resin film include polyester, ABS (acrylonitrile-butadiene-styrene), polyimide, polystyrene, polycarbonate, acrylic, polyolefin, cellulose resin, polysulfone, polyphenylene sulfide, polyethersulfone, polyetheretherketone, etc. Things. Among them, a polyester film is preferably used, and a stretched polyester film, particularly a biaxially stretched polyester film, is particularly preferable in terms of excellent mechanical strength and dimensional stability.
　また、基材として、透明なものはもちろん、発泡ポリエステルフィルムや、カーボンブラック等の黒色顔料や他の顔料を含有させた合成樹脂フィルムを使用することもできる。この場合、上述の基材は、それぞれの用途により適切なものを選択することができる。例えば、遮光部材として使用する際に、部材断面の合成樹脂フィルム部分においてレンズ等で集光された光が反射し悪影響を及ぼすため、高い遮光性が必要な場合には、カーボンブラック等の黒色顔料含有の合成樹脂フィルムを使用することができ、他の場合においては、透明若しくは発泡した合成樹脂フィルムを使用することができる。 Also, as a base material, a transparent polyester, a foamed polyester film, a black pigment such as carbon black, and a synthetic resin film containing other pigments can be used. In this case, the above-mentioned base material can be selected appropriately for each application. For example, when used as a light-shielding member, the light collected by the lens etc. on the synthetic resin film portion of the member cross section is reflected and adversely affected, so if high light-shielding properties are required, a black pigment such as carbon black The contained synthetic resin film can be used, and in other cases, a transparent or foamed synthetic resin film can be used.
　本実施形態においては、遮光膜自体で遮光部材としての充分な遮光性が得られることから、合成樹脂フィルムに黒色顔料を含有させる場合には、合成樹脂フィルムが目視で黒色に見える程度、即ち光学濃度が３程度となるように含有すれば良い。したがって、従来のように合成樹脂フィルム中に基材としての物性が損なわれる限界まで黒色顔料を含有させるものではないため、合成樹脂フィルムの物性を変化させることなく、安価に得ることができる。 In the present embodiment, the light shielding film itself provides sufficient light shielding properties as a light shielding member. Therefore, when the synthetic resin film contains a black pigment, the synthetic resin film looks visually black, that is, optical. It may be contained so that the concentration is about 3. Therefore, since the black pigment is not contained in the synthetic resin film until the limit that the physical properties as the base material are impaired as in the prior art, it can be obtained at low cost without changing the physical properties of the synthetic resin film.
　基材の厚みとしては、４～５０μｍが好ましく、特に薄型化の観点から、４～３８μｍがより好ましい。また、基材には、遮光膜との接着性を向上させる観点から、必要に応じアンカー処理またはコロナ処理を行うこともできる。 The thickness of the substrate is preferably 4 to 50 μm, and more preferably 4 to 38 μm from the viewpoint of reducing the thickness. Moreover, an anchor process or a corona process can also be performed to a base material as needed from a viewpoint of improving adhesiveness with a light shielding film.
　基材の少なくとも片面に形成される遮光膜は、水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂、カーボンブラック及び平均粒子径が１μｍ未満である微粒子を含有する。 The light-shielding film formed on at least one surface of the substrate contains a binder resin having a hydroxyl value of 100 (mgKOH / g) or more, carbon black, and fine particles having an average particle diameter of less than 1 μm.
　通常、平均粒子径が１μｍ未満の微粒子をバインダー樹脂中に用いると、粒子径が小さいため微粒子どうしで凝集する傾向となる。そうすると、かかる微粒子はバインダー樹脂中において均一に分散できずに偏って存在することとなる。かかる材料により遮光膜を形成すると、遮光膜中に微粒子の存在密度の低い部分が形成され易く、遮光膜に局部的に変形し易い部分ができてしまう。当該遮光膜を備えた遮光部材を一定期間使用すると、変形し易い部分からたわみ・ひずみが発生してしまうため、必ずしもコシが強いものとはいえなくなると考えられる。 Usually, when fine particles having an average particle diameter of less than 1 μm are used in the binder resin, the particles are small and tend to aggregate with each other. As a result, such fine particles cannot be uniformly dispersed in the binder resin and are present in an uneven manner. When the light shielding film is formed of such a material, a portion having a low density of fine particles is easily formed in the light shielding film, and a portion that is easily deformed locally is formed in the light shielding film. If the light shielding member provided with the light shielding film is used for a certain period of time, it is considered that bending or distortion occurs from a portion that is easily deformed, so that the stiffness is not necessarily strong.
　一方、平均粒子径が１μｍ未満である微粒子を水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂に含有させて用いると、当該微粒子が当該バインダー樹脂の水酸基価に影響されて局部的に凝集することなく均一に分散されることとなる。それにより、遮光膜全体として微粒子の分散バランスが好適なものとなり、遮光部材として用いても局部的にたわみ・ひずみが生じ難く、コシが強いものとすることができると考えられる。 On the other hand, when fine particles having an average particle diameter of less than 1 μm are used in a binder resin having a hydroxyl value of 100 (mg KOH / g) or more, the fine particles are locally aggregated due to the influence of the hydroxyl value of the binder resin. Without being dispersed. As a result, the dispersion balance of the fine particles is suitable for the entire light-shielding film, and even when used as a light-shielding member, local deflection and distortion are unlikely to occur, and it can be considered that the stiffness is strong.
　水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂としては、ポリ（メタ）アクリル酸系樹脂、ポリエステル樹脂、ポリ酢酸ビニル樹脂、ポリ塩化ビニル、ポリビニルブチラール樹脂、セルロース系樹脂、ポリスチレン／ポリブタジエン樹脂、ポリウレタン樹脂、アルキド樹脂、アクリル樹脂、不飽和ポリエステル樹脂、エポキシエステル樹脂、エポキシ樹脂、エポキシアクリレート系樹脂、ウレタンアクリレート系樹脂、ポリエステルアクリレート系樹脂、ポリエーテルアクリレート系樹脂、フェノール系樹脂、メラミン系樹脂、尿素系樹脂、ジアリルフタレート系樹脂等の熱可塑性樹脂または熱硬化性樹脂が挙げられ、これらの１種又は２種以上を混合して用いることもできる。 Examples of binder resins having a hydroxyl value of 100 (mgKOH / g) or more include poly (meth) acrylic acid resins, polyester resins, polyvinyl acetate resins, polyvinyl chloride, polyvinyl butyral resins, cellulose resins, and polystyrene / polybutadiene resins. , Polyurethane resin, alkyd resin, acrylic resin, unsaturated polyester resin, epoxy ester resin, epoxy resin, epoxy acrylate resin, urethane acrylate resin, polyester acrylate resin, polyether acrylate resin, phenol resin, melamine resin And thermoplastic resins such as urea-based resins and diallyl phthalate-based resins, and thermosetting resins. These can be used alone or in combination.
　バインダー樹脂の水酸基価は、１００（ｍｇＫＯＨ／ｇ）以上とする。バインダー樹脂の水酸基価を１００（ｍｇＫＯＨ／ｇ）以上とすることにより、上述のとおり平均粒子径が１μｍ未満の微粒子が遮光膜中に均一に分散されることとなり、遮光膜を薄型化させても遮光部材全体としてコシがあり、フィルムの破損等が生じ難いものとすることができる。バインダー樹脂の水酸基価は、コシをさらに発揮させる観点から、１２５（ｍｇＫＯＨ／ｇ）以上が好ましく、２００（ｍｇＫＯＨ／ｇ）以上であることがより好ましい。一方、上限としては、曲げ応力が低下して塗膜が脆くなるのを防止する観点から、２５０（ｍｇＫＯＨ／ｇ）以下とすることが好ましい。 The hydroxyl value of the binder resin is 100 (mgKOH / g) or more. By setting the hydroxyl value of the binder resin to 100 (mgKOH / g) or more, fine particles having an average particle diameter of less than 1 μm are uniformly dispersed in the light shielding film as described above, and even if the light shielding film is made thin. The light shielding member as a whole is firm, and the film can be hardly damaged. The hydroxyl value of the binder resin is preferably 125 (mgKOH / g) or more, and more preferably 200 (mgKOH / g) or more, from the viewpoint of further exerting stiffness. On the other hand, as an upper limit, it is preferable to set it as 250 (mgKOH / g) or less from a viewpoint of preventing that a bending stress falls and a coating film becomes weak.
　水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂の含有率は、遮光膜中、好ましくは１５重量％以上、より好ましくは２０重量％以上とする。前記バインダー樹脂の含有率を遮光膜中、１５重量％以上とすることにより、基材と遮光膜との接着性が低下するのを防止することができる。一方、前記バインダー樹脂の含有率は、遮光膜中、好ましくは５０重量％以下、より好ましくは４５重量％以下、さらに好ましくは４０重量％以下とする。前記バインダー樹脂の含有率を遮光膜中、５０重量％以下とすることにより、遮光性が低下するのを防止することができる。 The content of the binder resin having a hydroxyl value of 100 (mgKOH / g) or more is preferably 15% by weight or more, more preferably 20% by weight or more in the light shielding film. By making the content rate of the binder resin 15% by weight or more in the light shielding film, it is possible to prevent the adhesiveness between the base material and the light shielding film from being lowered. On the other hand, the content of the binder resin in the light shielding film is preferably 50% by weight or less, more preferably 45% by weight or less, and still more preferably 40% by weight or less. By making the content rate of the binder resin 50% by weight or less in the light shielding film, it is possible to prevent the light shielding property from being lowered.
　遮光膜に含有されるカーボンブラックは、バインダー樹脂を黒色に着色させ遮光性を付与させると共に、導電性を付与させて静電気による帯電を防止させるためのものである。 The carbon black contained in the light-shielding film is for coloring the binder resin black to impart light-shielding properties and to impart electrical conductivity to prevent electrostatic charging.
　カーボンブラックの平均粒子径は、充分な遮光性を得るため１μｍ以下が好ましく、０．５μｍ以下とすることがより好ましい。 The average particle size of carbon black is preferably 1 μm or less, and more preferably 0.5 μm or less in order to obtain sufficient light shielding properties.
　カーボンブラックの含有率は、遮光膜中、１０重量％～５０重量％が好ましく、１５重量％～４５重量％とすることがより好ましい。遮光膜中、１０重量％以上とすることにより、遮光性及び導電性が低下するのを防止することができ、５０重量％以下とすることにより、接着性や耐擦傷性が向上し、また塗膜強度の低下およびコスト高となるのを防止することができる。 The content of carbon black is preferably 10 to 50% by weight, more preferably 15 to 45% by weight in the light shielding film. When the content of the light shielding film is 10% by weight or more, it is possible to prevent the light shielding property and conductivity from being deteriorated, and when the content is 50% by weight or less, the adhesiveness and scratch resistance are improved. It is possible to prevent a decrease in film strength and an increase in cost.
　また、遮光膜には、表面に微細な凹凸を形成させることで入射光の反射を少なくし表面の光沢度（鏡面光沢度）を低下させ、遮光部材とした際の艶消し性を向上させる観点から、無機粒子を含有させてもよい。無機粒子としては、シリカ、メタケイ酸アルミン酸マグネシウム、酸化チタンなどが挙げられるが、これらの中でも、粒子の分散性・低コスト等の観点から、シリカを用いることが好ましい。 In addition, the light-shielding film is formed with fine irregularities on the surface to reduce the reflection of incident light, lower the surface glossiness (mirror glossiness), and improve the matte properties when used as a light-shielding member. In addition, inorganic particles may be included. Examples of inorganic particles include silica, magnesium aluminate metasilicate, and titanium oxide. Among these, silica is preferably used from the viewpoints of particle dispersibility, low cost, and the like.
　無機粒子の平均粒子径は、１μｍ～１０μｍが好ましく、１μｍ～６μｍとすることがより好ましい。このような範囲とすることにより、遮光部材の表面に微細な凹凸が形成され、艶消し性が得られるからである。 The average particle diameter of the inorganic particles is preferably 1 μm to 10 μm, and more preferably 1 μm to 6 μm. By setting it as such a range, a fine unevenness | corrugation is formed in the surface of a light shielding member, and matte property is acquired.
　無機粒子の含有率は、遮光膜中、０．５重量％～１０重量％が好ましく、０．５重量％～５重量％とすることがより好ましい。遮光膜中、０．５重量％以上とすることにより、表面の光沢度（鏡面光沢度）が増加して艶消し性が低下するのを防止することができる。一方、１０重量％以下とすることにより、遮光部材の摺動による無機粒子の脱落が生じたり、遮光部材自体に傷が発生するのを防ぎ、摺動性の低下を招くことを防止することができる。 The content of the inorganic particles is preferably 0.5 to 10% by weight, more preferably 0.5 to 5% by weight in the light shielding film. By setting the content to 0.5% by weight or more in the light shielding film, it is possible to prevent the glossiness of the surface (mirror glossiness) from increasing and the matting property from being lowered. On the other hand, by setting the content to 10% by weight or less, it is possible to prevent the inorganic particles from dropping off due to the sliding of the light shielding member, or to prevent the light shielding member itself from being damaged, and to prevent the sliding property from being deteriorated. it can.
　特に高い遮光性や導電性が求められる場合には、無機粒子の含有率は、上述の範囲からさらに遮光膜中、５重量％以下とすることが好ましい。本実施形態で用いる無機粒子は、前述のように少量でも高い艶消し性を得ることができるので、５重量％以下とすることにより、十分な艶消し性が得られ、しかも相対的にカーボンブラック、後述する微粒子の含有率を増加させることが可能となり、コシを低下させることなく遮光性、導電性等の物性を向上させることができる。 In particular, when high light shielding properties and electrical conductivity are required, the content of inorganic particles is preferably 5% by weight or less in the light shielding film from the above range. As described above, the inorganic particles used in the present embodiment can obtain a high matte property even in a small amount. Therefore, by setting the amount to 5% by weight or less, a sufficient matte property can be obtained, and relatively, carbon black can be obtained. Thus, it becomes possible to increase the content of fine particles, which will be described later, and to improve physical properties such as light shielding properties and electrical conductivity without lowering the stiffness.
　遮光膜に含有される平均粒径１μｍ未満の微粒子は、上述したように水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂と併せて用いることにより、遮光膜全体として微粒子の分散バランスが好適なものとなり、遮光部材として用いても局部的にたわみ・ひずみが生じ難く、コシが強いものとすることができる。また、遮光膜とした際の塗膜の硬度を向上させることもできる。さらに、局部的にたわみ・ひずみが生じ難いため、熱変形が起こりにくいものとすることができる。 As described above, the fine particles having an average particle size of less than 1 μm contained in the light shielding film are used in combination with the binder resin having a hydroxyl value of 100 (mgKOH / g) or more as described above. Therefore, even if it is used as a light shielding member, it is difficult for local deflection and distortion to occur, and it can be strong. Moreover, the hardness of the coating film when it is set as the light shielding film can also be improved. Furthermore, since it is difficult for local deflection and distortion to occur, thermal deformation can hardly occur.
　このようなものとしては、例えば、ポリエチレンワックス、パラフィンワックス等の炭化水素系滑剤、ステアリン酸、１２－ヒドロキシステアリン酸等の脂肪酸系滑剤、オレイン酸アミド、エルカ酸アミド等のアミド系滑剤、ステアリン酸モノグリセリド等のエステル系滑剤、アルコール系滑剤、シリコーン樹脂粒子、ポリテトラフッ化エチレンワックス等のフッ素樹脂粒子、アクリル樹脂粒子、架橋アクリル樹脂粒子、架橋ポリスチレン樹脂粒子等の樹脂微粒子からなるもの、或いは、金属石鹸、滑石、二硫化モリブデン、炭酸カルシウム、シリカ、水酸化アルミニウム、酸化ジルコニウム、硫酸バリウム、酸化チタン等の固体潤滑剤等の無機微粒子からなるものが挙げられる。これらの中でも、全体的に粒子の硬度が高くコシの向上に寄与し得る観点から、無機微粒子からなるものを用いることが特に好ましい。さらには無機微粒子の中でも、炭酸カルシウムを用いると、遮光部材としてコシがより強いものとなるため、好ましい。これらの微粒子は１種又は２種以上を混合して用いることもできる。なお、ここで列挙したシリカは、前述の艶消し性を向上させるために含有するシリカとは異なるものである。 Examples thereof include 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, and stearic acid. Mono-glyceride ester lubricants, alcohol lubricants, silicone resin particles, fluororesin particles such as polytetrafluoroethylene wax, acrylic resin particles, cross-linked acrylic resin particles, cross-linked polystyrene resin particles and other resin fine particles, or metal soap , Talc, molybdenum disulfide, calcium carbonate, silica, aluminum hydroxide, zirconium oxide, barium sulfate, titanium oxide, and other inorganic fine particles such as solid lubricants. Among these, it is particularly preferable to use those composed of inorganic fine particles from the viewpoint that the particle hardness is high overall and can contribute to improvement in stiffness. Furthermore, among inorganic fine particles, it is preferable to use calcium carbonate because it is stronger as a light shielding member. These fine particles can be used alone or in combination of two or more. In addition, the silica enumerated here is different from the silica contained in order to improve the above-mentioned matting property.
　微粒子の含有率は、遮光膜中２．５重量％～４０重量％とすることが好ましく、より好ましくは１０重量％～３５重量％とする。遮光膜中２．５重量％以上とすることにより、コシをより強くすることができ、４０重量％以下とすることにより、カーボンブラックの相対的含有量を高くすることができ、コシを得つつ遮光性が低下するのを防止することができる。 The content of the fine particles is preferably 2.5 to 40% by weight, more preferably 10 to 35% by weight in the light shielding film. By making it 2.5% by weight or more in the light shielding film, the stiffness can be made stronger, and by making it 40% by weight or less, the relative content of carbon black can be increased, while obtaining the stiffness. It can prevent that light-shielding property falls.
　また、前記バインダー樹脂に対する前記微粒子の含有割合は、前記バインダー樹脂１００重量部に対し、前記微粒子を３０～２００重量部含有させることが好ましく、５０～１５０重量部とすることがさらに好ましい。このような含有割合とすることにより、遮光性を維持しつつ、遮光膜中における前記微粒子の分散バランスがさらに改善され、コシのより優れた遮光部材とすることができる。 The content of the fine particles with respect to the binder resin is preferably 30 to 200 parts by weight, more preferably 50 to 150 parts by weight with respect to 100 parts by weight of the binder resin. By setting such a content ratio, the dispersion balance of the fine particles in the light shielding film can be further improved while maintaining the light shielding property, and a light shielding member having a better stiffness can be obtained.
　基材の少なくとも片面に形成される遮光膜には、本発明の機能を損なわない場合であれば、難燃剤、抗菌剤、防カビ剤、酸化防止剤、可塑剤、レベリング剤、流動調整剤、消泡剤、分散剤等の種々の添加剤を含有させることができる。 If the light-shielding film formed on at least one side of the substrate does not impair the function of the present invention, a flame retardant, an antibacterial agent, a fungicide, an antioxidant, a plasticizer, a leveling agent, a flow regulator, Various additives such as an antifoaming agent and a dispersing agent can be contained.
　遮光膜の厚みは３μｍ～３０μｍが好ましく、５μｍ～２０μｍとすることがより好ましい。３μｍ以上とすることにより、遮光膜にピンホール等が生ずるのを防止することができ、充分な遮光性を得ることができる。また、３０μｍ以下とすることにより、遮光膜に割れが生ずることを防止することができる。 The thickness of the light shielding film is preferably 3 μm to 30 μm, and more preferably 5 μm to 20 μm. By setting the thickness to 3 μm or more, it is possible to prevent pinholes and the like from being generated in the light shielding film and to obtain sufficient light shielding properties. Moreover, it can prevent that a crack arises in a light shielding film by setting it as 30 micrometers or less.
　本実施形態の光学機器用遮光部材は、基材の片面または両面に、上述のような水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂、カーボンブラック及び平均粒子径が１μｍ未満である微粒子等を含む遮光膜用塗布液をディップコート、ロールコート、バーコート、ダイコート、ブレードコート、エアナイフコート等の従来公知の塗布方法により塗布し、乾燥させた後、必要に応じて加熱・加圧等することにより得ることができる。塗布液の溶媒は、水や有機溶剤、水と有機溶剤との混合物等を用いることができる。 The light-shielding member for an optical device according to this embodiment includes a binder resin having a hydroxyl value of 100 (mgKOH / g) or more, carbon black, and fine particles having an average particle diameter of less than 1 μm on one or both surfaces of a substrate. A coating solution for a light-shielding film including a dip coat, a roll coat, a bar coat, a die coat, a blade coat, an air knife coat and the like is applied and dried, followed by heating and pressurizing as necessary. Can be obtained. As the solvent of the coating solution, water, an organic solvent, a mixture of water and an organic solvent, or the like can be used.
　以上のように、本実施形態の光学機器用遮光部材は、基材の少なくとも片面に特定の遮光膜を含むことから、遮光性、導電性等の遮光膜の物性を保持したものであるため、高性能一眼レフカメラ、コンパクトカメラ、ビデオカメラ、携帯電話、プロジェクタ等の光学機器のシャッター、絞り部材として好適に用いることができる。 As described above, since the light-shielding member for an optical device according to the present embodiment includes a specific light-shielding film on at least one surface of the base material, the light-shielding property and the properties of the light-shielding film such as conductivity are maintained. It can be suitably used as a shutter and diaphragm member for optical devices such as high-performance single-lens reflex cameras, compact cameras, video cameras, mobile phones, and projectors.
　特に、本実施形態の遮光膜は、水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂と平均粒子径が１μｍ未満である微粒子とを含有するものであるため、微粒子が遮光膜中に均一に分散することが可能となるため、薄型化させてもコシがあり、フィルムの破損等が生じ難い遮光部材とすることができる。その結果、近年、特に薄型化が求められているカメラ付き携帯電話のシャッター、絞り部材などに特に好適に用いられるものとなる。さらに、局部的にたわみ・ひずみが生じ難いため、熱変形が起こり難いものとすることができる。 In particular, since the light shielding film of this embodiment contains a binder resin having a hydroxyl value of 100 (mgKOH / g) or more and fine particles having an average particle diameter of less than 1 μm, the fine particles are uniform in the light shielding film. Therefore, it is possible to provide a light-shielding member that is stiff even if it is thinned and hardly breaks the film. As a result, it is particularly preferably used for shutters, diaphragm members, and the like of camera-equipped mobile phones that have recently been required to be thin. Furthermore, since local deflection and distortion are unlikely to occur, thermal deformation can hardly occur.
　以下、実施例により本発明を更に説明する。なお、「部」、「％」は特に示さない限り、重量基準とする。 Hereinafter, the present invention will be further described with reference to examples. “Parts” and “%” are based on weight unless otherwise specified.
１．遮光部材の作製
［実施例１］
　基材として厚み２５μｍの黒色ポリエチレンテレフタレートフィルム（ルミラーX30：東レ社）を用い、当該基材の両面に下記処方の遮光膜用塗布液をそれぞれバーコート法により、乾燥時の厚みがそれぞれ１０μｍとなるように塗布・乾燥を行って遮光膜を形成し、実施例１の光学機器用遮光部材を作製した。 1. Production of light shielding member [Example 1]
A black polyethylene terephthalate film (Lumirror X30: Toray Industries, Inc.) having a thickness of 25 μm is used as a base material, and a coating solution for a light-shielding film having the following formulation is applied to both surfaces of the base material by a bar coating method, respectively, and the thickness when dried is 10 μm. Thus, the light shielding film was formed by coating and drying, and the light shielding member for optical equipment of Example 1 was produced.
＜実施例１の遮光膜用塗布液＞
・ポリエステルポリオール　　　　　　　　　　　　　　９．６８部
（バーノック11-408：ＤＩＣ社、水酸基価２００（ｍｇＫＯＨ／ｇ）、固形分７０％）
・イソシアネート　　　　　　　　　　　　　　　　　　９．３７部
（バーノックDN980：ＤＩＣ社、固形分７５％）
・カーボンブラック　　　　　　　　　　　　　　　　　４．５７部
（バルカンXC-72：キャボット社）
・シリカ　　　　　　　　　　　　　　　　　　　　　　０．８９部
（ＴＳ１００：エボニック・デグサ・ジャパン社、平均粒子径４μｍ）
・微粒子（炭酸カルシウム）　　　　　　　　　　　　　７．５０部
（サンライトSL-700:竹原化学工業社、平均粒子径０．７４μｍ）
・メチルエチルケトン　　　　　　　　　　　　　　　３６．９３部
・トルエン　　　　　　　　　　　　　　　　　　　　１５．８３部 <Coating solution for light shielding film of Example 1>
Polyester polyol 9.68 parts (Bernock 11-408: DIC Corporation, hydroxyl value 200 (mgKOH / g), solid content 70%)
・ Isocyanate 9.37 parts (Bernock DN980: DIC, solid content 75%)
・ 4.57 parts of carbon black (Vulcan XC-72: Cabot)
・ Silica 0.89 parts (TS100: Evonik Degussa Japan, average particle size 4 μm)
-Fine particles (calcium carbonate) 7.50 parts (Sunlite SL-700: Takehara Chemical Industries, average particle size 0.74 μm)
・ Methyl ethyl ketone 36.93 parts ・ Toluene 15.83 parts
［実施例２］
　実施例１で用いた遮光膜用塗布液のうち、ポリエステルポリオールをポリエステルポリオール（バーノックJ-517：ＤＩＣ社、水酸基価１４０（ｍｇＫＯＨ／ｇ）、固形分７０％）に変更し、イソシアネートの添加量を６．５６重量部とした以外は実施例１と同様にして、実施例２の光学機器用遮光部材を作製した。 [Example 2]
Of the coating solution for light-shielding film used in Example 1, the polyester polyol was changed to polyester polyol (Bernock J-517: DIC, hydroxyl value 140 (mgKOH / g), solid content 70%), and the amount of isocyanate added A light-shielding member for optical equipment of Example 2 was produced in the same manner as Example 1 except that was changed to 6.56 parts by weight.
［実施例３］
　実施例１で用いた遮光膜用塗布液のうち、ポリエステルポリオールをポリエステルポリオール（バーノックD-144-65BA：ＤＩＣ社、水酸基価１００（ｍｇＫＯＨ／ｇ）、固形分６５％）に変更して添加量を１０．４２重量部とし、さらにイソシアネートの添加量を５．０４重量部とした以外は実施例１と同様にして、実施例３の光学機器用遮光部材を作製した。 [Example 3]
Of the coating solution for light-shielding film used in Example 1, the polyester polyol was changed to a polyester polyol (Bernock D-144-65BA: DIC, hydroxyl value 100 (mgKOH / g), solid content 65%) and added. Was made in the same manner as in Example 1 except that the amount of isocyanate added was 5.04 parts by weight, and a light-shielding member for optical equipment of Example 3 was produced.
［実施例４］
　実施例１で用いた遮光膜用塗布液のうち、微粒子（炭酸カルシウム）を微粒子（酸化チタン、Ａ－１００：石原産業社、平均粒子径０．１５μｍ）に変更した以外は実施例１と同様にして、実施例４の光学機器用遮光部材を作製した。 [Example 4]
Of the coating solution for the light-shielding film used in Example 1, fine particles (calcium carbonate) were changed to fine particles (titanium oxide, A-100: Ishihara Sangyo Co., Ltd., average particle size 0.15 μm). Thus, a light shielding member for optical equipment of Example 4 was produced.
［実施例５］
　実施例１で用いた遮光膜用塗布液のうち、微粒子（炭酸カルシウム）を微粒子（アクリル粒子、ケミスノーMP-1600：綜研化学社、平均粒子径0.8μｍ）に変更した以外は実施例１と同様にして、実施例５の光学機器用遮光部材を作製した。 [Example 5]
Of the coating solution for the light-shielding film used in Example 1, fine particles (calcium carbonate) were changed to fine particles (acrylic particles, Chemisnow MP-1600: Soken Chemical Co., Ltd., average particle size 0.8 μm), and the same as in Example 1. Thus, a light shielding member for optical equipment of Example 5 was produced.
［比較例１］
　実施例１で用いた遮光膜用塗布液のうち、ポリエステルポリオールをアクリルポリオール（アクリディックA-801P：ＤＩＣ社、水酸基価５０（ｍｇＫＯＨ／ｇ）、固形分５０％）に変更して添加量を１３．５５重量部とし、イソシアネートの添加量を３．２８重量部とした以外は実施例１と同様にして、比較例１の光学機器用遮光部材を作製した。 [Comparative Example 1]
Of the coating solution for the light-shielding film used in Example 1, the polyester polyol was changed to an acrylic polyol (Acridic A-801P: DIC, hydroxyl value 50 (mgKOH / g), solid content 50%), and the addition amount was changed. A light shielding member for optical equipment of Comparative Example 1 was produced in the same manner as in Example 1 except that the amount was 13.55 parts by weight and the amount of isocyanate added was 3.28 parts by weight.
［比較例２］
　実施例１で用いた遮光膜用塗布液のうち、微粒子（炭酸カルシウム）を粒子（硫酸バリウム、ＢＭＨ：堺化学工業社、平均粒子径２．５μｍ）に変更した以外は実施例１と同様にして、比較例２の光学機器用遮光部材を作製した。 [Comparative Example 2]
Of the coating solution for the light-shielding film used in Example 1, fine particles (calcium carbonate) were changed to particles (barium sulfate, BMH: Sakai Chemical Industry Co., Ltd., average particle size: 2.5 μm). Thus, a light shielding member for optical equipment of Comparative Example 2 was produced.
２．評価
　以上のようにして実施例１～５及び比較例１～２で得られた光学機器用遮光部材について、下記の方法で物性の評価をした。それぞれの結果を表１に示す。 2. Evaluation The physical properties of the light shielding members for optical devices obtained in Examples 1 to 5 and Comparative Examples 1 and 2 were evaluated as follows. The results are shown in Table 1.
（１）遮光性
　上記実施例１～５及び比較例１～２で得られた光学機器用遮光部材を、ＪＩＳ　Ｋ７６５１：１９８８に基づき光学濃度計（ＴＤ－９０４：グレタグマクベス社）を用いて光学濃度を測定した。光学濃度が４．０を超え、測定不能領域の濃度となったものを「○」とし、４．０以下であったものを「×」とした。なお、測定はＵＶフィルターを用いた。測定結果を表１に示す。 (1) Light-shielding property The light-shielding member for optical equipment obtained in Examples 1 to 5 and Comparative Examples 1 and 2 was optically measured using an optical densitometer (TD-904: Gretag Macbeth) based on JIS K7651: 1988. Concentration was measured. The case where the optical density exceeded 4.0 and became the density of the non-measurable region was indicated as “◯”, and the case where it was 4.0 or less was indicated as “X”. Note that a UV filter was used for the measurement. The measurement results are shown in Table 1.
（２）コシの強さ
　実施例１～５及び比較例１～２で得られた光学機器用遮光部材から、幅１．５ｃｍ長さ２０ｃｍの実施例１～５及び比較例１～２のサンプルを採取し、当該サンプルをそれぞれ長さ方向に２周させて円筒状とし、当該サンプルが三重に重ならないようにしてポリエステルテープ（ニチバン社）にて当該円筒状のサンプルの最表面に存在するサンプル端辺が中心になる位置で幅１．５ｃｍ、長さ１．８ｃｍ接着し、幅（高さ）１．５ｃｍ、直径約３．２ｃｍの円筒状の実施例１～５及び比較例１～２のサンプルを作製した。 (2) Strength of stiffness Samples of Examples 1 to 5 and Comparative Examples 1 and 2 having a width of 1.5 cm and a length of 20 cm from the light shielding members for optical devices obtained in Examples 1 to 5 and Comparative Examples 1 and 2 The sample is rounded twice in the length direction to form a cylinder, and the sample is present on the outermost surface of the cylindrical sample with polyester tape (Nichiban Co., Ltd.) so that the sample does not overlap three times. Cylindrical Examples 1 to 5 and Comparative Examples 1 and 2 having a width of 1.5 cm and a length of 1.8 cm adhered at the center of the end side, and a width (height) of 1.5 cm and a diameter of about 3.2 cm. A sample of was prepared.
　次いで、市販の電子天秤（ＢＸ３２００Ｄ：島津製作所社）からなる計測部３と、上部固定部２とからなり、前記計測部３と前記上部固定部との隙間が２ｃｍである図１にあるような測定装置１０を用意した。かかる測定装置１０の計測部３と上部固定部２との隙間に、上述した直径約３．２ｃｍの円筒状の実施例１～５及び比較例１～２のサンプル１を、その円筒状の側面が当該計測装置１０の計測部３及び上部固定部２と接するように載置し、サンプル１の弾性力による１０秒後の計測部３の電子天秤の量り量を測定した。測定した結果、量り量が１ｇ以上であったものを「◎」とし、０．７ｇ以上～１ｇ未満であったものを「○」とし、０．７ｇ未満であったものを「×」とした。測定結果を表１に示す。 Next, as shown in FIG. 1, the measuring unit 3 is a commercially available electronic balance (BX3200D: Shimadzu Corporation) and the upper fixing unit 2 and the gap between the measuring unit 3 and the upper fixing unit is 2 cm. A measuring device 10 was prepared. In the gap between the measuring part 3 and the upper fixing part 2 of the measuring apparatus 10, the cylindrical examples 1 to 5 having a diameter of about 3.2 cm and the samples 1 of the comparative examples 1 and 2 are placed on the cylindrical side surface. Was placed in contact with the measuring unit 3 and the upper fixing unit 2 of the measuring device 10, and the weighing amount of the electronic balance of the measuring unit 3 after 10 seconds due to the elastic force of the sample 1 was measured. As a result of measurement, the case where the weighing amount was 1 g or more was designated as “◎”, the case where the weight was 0.7 g or more but less than 1 g was designated as “◯”, and the case where the weight was less than 0.7 g was designated as “X”. . The measurement results are shown in Table 1.
（３）耐久性
　実施例１～５及び比較例１～２で得られた光学機器用遮光部材をカメラの絞り部材として用い、２万５千回動作させて当該光学機器用遮光部材の変形或いは破損の有無を目視にて確認した。変形或いは破損がなかったものを「○」とし、変形或いは破損があったものを「×」とした。また、変形或いは破損がなかったものについて、再度２万５千回動作させ、後に目視にて確認した際にも変形或いは破損がなかったものを「◎」とした。測定結果を表１に示す。 (3) Durability Using the light shielding member for optical equipment obtained in Examples 1 to 5 and Comparative Examples 1 and 2 as a diaphragm member of a camera, the optical device shading member is deformed or moved 25,000 times. The presence or absence of damage was confirmed visually. Those without deformation or breakage were marked with “◯”, and those with deformation or breakage were marked with “x”. Moreover, about what did not have a deformation | transformation or a damage, it was made to operate 25,000 times again, and when it checked visually later, what was not a deformation | transformation or a damage was set as "(double-circle)". The measurement results are shown in Table 1.
（４）熱変形
　　基材の一方の面に、上記実施例１～５及び比較例１～２の遮光膜が設けられた光学機器用遮光部材を用意した。縦横１０ｃｍ×１０ｃｍに裁断し、８０℃、５分の環境に静置し、端部のカール量を測定した。カール量の四隅の合計が、０ｍｍ以上～３０ｍｍ未満であったものを「○」とし、３０ｍｍ以上であったものを「×」とした。測定結果を表１に示す。 (4) Thermal deformation A light-shielding member for optical equipment was prepared in which the light-shielding films of Examples 1 to 5 and Comparative Examples 1 and 2 were provided on one surface of the substrate. It was cut into 10 cm × 10 cm in length and width and allowed to stand in an environment at 80 ° C. for 5 minutes, and the curl amount at the end was measured. The case where the total of the four corners of the curl amount was 0 mm or more and less than 30 mm was designated as “◯”, and the case where it was 30 mm or more was designated as “X”. The measurement results are shown in Table 1.
（５）接着性
　上記実験例１～５及び比較例１～２で得られた光学機器用遮光部材の遮光膜と基材との接着性を、ＪＩＳ　５６００－５－６における碁盤目テープ法に基づき測定して評価した。碁盤目部分の面績が１０％以上剥離したものを「×」、５％以上１０％未満のものを「△」、５％未満のものを「○」とした。 (5) Adhesiveness The adhesiveness between the light-shielding film and the base material of the light-shielding member for optical equipment obtained in the above Experimental Examples 1 to 5 and Comparative Examples 1 and 2 is determined by the cross-cut tape method in JIS 5600-5-6. Based on measurement and evaluation. The case where the surface texture of the cross section was peeled off by 10% or more was indicated as “X”, the case where it was 5% or more and less than 10% was indicated as “Δ”, and the case where it was less than 5% was indicated as “◯”.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１の結果から分かるように、実施例１～５で得られた光学機器用遮光部材は、合成樹脂フィルムからなる基材と、前記基材の少なくとも片面に形成された遮光膜とを含むものであって、当該遮光膜が、水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂、カーボンブラック、シリカ、及び平均粒子径が１μｍ未満である微粒子を含有するものであったため、遮光性を発揮しつつ、薄型化させてもコシの強いものとすることができ、耐久性に優れるものであるためフィルム等の破損等が生じ難いものとすることができた。 As can be seen from the results in Table 1, the light shielding member for optical equipment obtained in Examples 1 to 5 includes a base material made of a synthetic resin film and a light shielding film formed on at least one side of the base material. Since the light-shielding film contains a binder resin having a hydroxyl value of 100 (mgKOH / g) or more, carbon black, silica, and fine particles having an average particle diameter of less than 1 μm, the light-shielding property is obtained. Even if it is made thin, it can be strong, and it is excellent in durability, so that it is difficult to cause breakage of a film or the like.
　特に、実施例１、２の光学機器用遮光部材は、バインダー樹脂の水酸基価が１２５（ｍｇＫＯＨ／ｇ）以上のものであったため、コシの強さが特に高いものとなり、さらに実施例１の光学機器用遮光部材は、バインダー樹脂の水酸基価が２００（ｍｇＫＯＨ／ｇ）以上であり、かつ微粒子として炭酸カルシウムを用いたものであったため、コシの強さが特に高く、耐久性にも特に高いものとなった。 In particular, since the light shielding member for optical devices of Examples 1 and 2 has a hydroxyl value of 125 (mgKOH / g) or more of the binder resin, the strength of the stiffness is particularly high. The light shielding member for equipment has a hydroxyl value of the binder resin of 200 (mgKOH / g) or more and uses calcium carbonate as fine particles, so that the stiffness is particularly high and the durability is particularly high. It became.
　一方、比較例１の光学機器用遮光部材は、水酸基価が１００（ｍｇＫＯＨ／ｇ）未満のバインダー樹脂を用いたため、遮光膜中に微粒子が均一に分散されず、コシの弱いものとなった。また、これにより耐久性にも乏しいものとなった。 On the other hand, since the light shielding member for optical equipment of Comparative Example 1 used a binder resin having a hydroxyl value of less than 100 (mgKOH / g), fine particles were not uniformly dispersed in the light shielding film, and the stiffness was weak. Moreover, this also made the durability poor.
　また、比較例２の光学機器用遮光部材は、平均粒子径が１μｍ以上の粒子を用いたため、遮光膜中に微粒子が均一に分散されず、コシの弱いものとなった。また、これにより耐久性にも乏しいものとなった。 Further, since the light shielding member for optical equipment of Comparative Example 2 used particles having an average particle diameter of 1 μm or more, the fine particles were not uniformly dispersed in the light shielding film, and the stiffness was weak. Moreover, this also made the durability poor.
　実施例１～５で得られた光学機器用遮光部材は、当該遮光膜が、水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂、カーボンブラック、シリカ、及び平均粒子径が１μｍ未満である微粒子を含有するものであったため、遮光膜全体として微粒子の分散バランスが好適なものとなり、遮光部材として遮光膜が基材の片面に設けられた場合であっても局部的にたわみ・ひずみが生じ難く、熱変形が起こり難いものとすることができた。 In the light-shielding member for optical equipment obtained in Examples 1 to 5, the light-shielding film has a binder resin having a hydroxyl value of 100 (mgKOH / g) or more, carbon black, silica, and an average particle diameter of less than 1 μm. Because it contains fine particles, the dispersion of fine particles is suitable as a whole of the light shielding film, and even when the light shielding film is provided on one side of the substrate as a light shielding member, local deflection and distortion occur. It was difficult to cause thermal deformation.
　比較例１で得られた光学機器用遮光部材は、当該遮光膜中の顔料割合が高いため、バインダー樹脂に起因する熱変形を起こし難いものとなった。しかし、顔料割合が高いことや微粒子が均一に分散されないものであったために、基材との接着性が悪いものとなった。 The light shielding member for optical equipment obtained in Comparative Example 1 has a high pigment ratio in the light shielding film, and thus hardly undergoes thermal deformation due to the binder resin. However, since the pigment ratio is high and the fine particles are not uniformly dispersed, the adhesion with the substrate is poor.
　比較例２で得られた光学機器用遮光部材は、実施例１で得られた光学機器用遮光部材と、当該遮光膜中の顔料割合は同じであるが、平均粒子径が１μｍ未満である微粒子を含まないものであったため、塗膜中に微粒子が均一に分散されず、局部的にたわみ・ひずみが生じてしまい、熱変形が起こるものとなった。また、基材との接着性も実施例１と比べて劣るものとなった。 The light shielding member for optical equipment obtained in Comparative Example 2 is the same as the light shielding member for optical equipment obtained in Example 1, but has the same pigment ratio in the light shielding film but has an average particle diameter of less than 1 μm. Therefore, fine particles were not uniformly dispersed in the coating film, resulting in local deflection and distortion, resulting in thermal deformation. Further, the adhesion with the substrate was inferior to that of Example 1.
１・・・本発明の光学機器用遮光部材
２・・・上部固定部
３・・・計測部
１０・・・測定装置 DESCRIPTION OF SYMBOLS 1 ... Optical apparatus light-shielding member 2 ... Upper fixed part 3 ... Measuring part 10 ... Measuring apparatus

Claims (4)

  1. 　合成樹脂フィルムからなる基材と、前記基材の少なくとも片面に形成された遮光膜とを含む光学機器用遮光部材であって、
    　前記遮光膜は、水酸基価が１００（ｍｇＫＯＨ／ｇ）以上であるバインダー樹脂、カーボンブラック及び平均粒子径が１μｍ未満である微粒子を含有することを特徴とする光学機器用遮光部材。     A light-shielding member for an optical device comprising a base material made of a synthetic resin film and a light-shielding film formed on at least one surface of the base material,
    The light shielding film includes a binder resin having a hydroxyl value of 100 (mgKOH / g) or more, carbon black, and fine particles having an average particle diameter of less than 1 μm.
  2. 　請求項１記載の光学機器用遮光部材において、
    　前記微粒子は、無機微粒子であることを特徴とする光学機器用遮光部材。     The light-shielding member for optical equipment according to claim 1,
    The light shielding member for optical equipment, wherein the fine particles are inorganic fine particles.
  3. 　請求項２記載の光学機器用遮光部材において、
    　前記微粒子は、炭酸カルシウムであることを特徴とする光学機器用遮光部材。     In the light-shielding member for optical equipment according to claim 2,
    The light-shielding member for an optical instrument, wherein the fine particles are calcium carbonate.
  4. 　請求項１～３何れか１項記載の光学機器用遮光部材において、
    　前記遮光膜は、シリカを含むことを特徴とする光学機器用遮光部材。     The light shielding member for an optical device according to any one of claims 1 to 3,
    The light shielding member for optical equipment, wherein the light shielding film contains silica.
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