TW201208877A - Light-blocking member for optical instrument - Google Patents

Abstract

Disclosed is a light-blocking member that is for an optical instrument and has resilience even if made thin, and of which rupture, etc. of a film is difficult to arise. The light-blocking member for an optical instrument contains: a substrate comprising a synthetic resin film; and a light-blocking film that is formed on at least one side of the abovementioned substrate. The abovementioned light-blocking film is characterized by containing: a binder resin of which the hydroxyl value is at least 100 (mg KOH/g); carbon black; inorganic particles; and resin particles of which the average particle size is 1-10 μm. Also, the aforementioned resin particles are characterized by being cross-bridged polymethyl methacrylate particles.

Description

201208877 VI. Description of the Invention: The present invention relates to a light shielding member for an optical device which can be used for shutters or aperture members of various optical devices. [Prior Art] In recent years, metal materials have been required for miniaturization and weight reduction of various optical devices such as high-performance single-lens reflex cameras, compact cameras, and camcorders. The shutter or aperture member of the formed optical machine is replaced by a plastic material. As the aperture of such a plastic material, a light-shielding film formed by forming a light-shielding film containing carbon black, a lubricant, fine particles, and a binder resin on a film substrate is known (Patent Documents 1 and 2). [PRIOR ART DOCUMENT] [Patent Document] Patent Document 1: JP-A-9-2742, No. 9-8 Patent Document 2: WO2006/0 1 6555 SUMMARY OF INVENTION [Problems to be Solved by the Invention] The light-shielding film is Compared with a light-shielding member made of a metal material, the light-shielding member is extremely weak. Therefore, when the light-shielding film is used as a shutter or a diaphragm member of an optical device, it is not resistant to use, and is deformed from a portion in contact with other members, and is deformed. Or the problem of damage. These issues have become a big issue for the current situation of thinning in the near-5-201208877. In order to solve this problem, a design in which a high-elastic particle is contained in a light-shielding film is considered. However, in this case, the relative content ratio of other materials constituting the light-shielding film is inevitably reduced, so that the light-shielding property and the slidability of the light-shielding member are exhibited. The balance is hindered. On the other hand, a method of directly reducing the thickness of the light-shielding member made of a metal material is considered. However, when the light-shielding member is used as a shutter or a diaphragm member, it is likely to be deformed by contact with other members. Since the deformation cannot be restored to the original nature of the metal material, the use of the light-shielding members is poor. And metal materials are more expensive than plastic materials. Therefore, there is a demand for a light-shielding member for an optical device which does not use a metal material and which is elastic and thin, and which is less likely to cause film damage. [Means for Solving the Problem] The present inventors have found that a binder resin having a hydroxyl group content of 100 (mgKOH/g) or more as a binder resin is added to the light-shielding film, and the average particle diameter is The light-shielding member of the resin particles of 1 to ΙΟμηη can be made elastic even if it is thinned, and it is difficult to cause film breakage by contact with other members, and thus the present invention has been completed. In other words, the light-shielding member for an optical device according to the present invention is a substrate comprising a synthetic resin film and a light-shielding film formed on at least one surface of the substrate, wherein the light-shielding film contains a hydroxyl group of 100 ( A binder resin, carbon black, inorganic particles, and resin particles having an average particle diameter of 1 to 1 〇 μηη, more than mgKOH/g).

Further, in the light-shielding member for optical device of the present invention, the resin particles are preferably cross-linked polymethyl methacrylate particles. Further, the light-shielding member for optical devices of the present invention preferably contains 20 to 150 parts by weight of the resin particles based on 100 parts by weight of the binder resin. [Effect of the Invention] According to the invention, the light-shielding film contains a binder resin having a hydroxyl group value of 100 (mgKOH/g) or more and a resin particle having an average particle diameter of 1 to ΙΟμm, so that it can be made thinner even if it is thinner. It is difficult to produce a light-shielding member in which the film is broken. [Embodiment] Hereinafter, an embodiment of a light-shielding member for an optical device (hereinafter also referred to as a "light-shielding member") of the present invention will be described. The light shielding member of the present invention is a substrate comprising a synthetic resin film and a light shielding film formed on at least one surface of the substrate. The light-shielding film contains a binder resin having a hydroxyl group value of 100 (mgKOH/g) or more, carbon black, inorganic particles, and resin particles having an average particle diameter of 1 to ΙΟμm. In the present invention, the average particle diameter refers to a ruthenium particle diameter (D 5 0 ) measured by a laser diffraction type particle size distribution measuring apparatus (for example, Shimadzu Corporation: SALD-7000 or the like). Examples of the substrate composed of a synthetic resin film include polyester, ABS (acrylonitrile-butadiene-styrene), polyimide, polystyrene, polycarbonate, acrylic, polyolefin, cellulose resin, Polyfluorene, polyphenylene sulfide, 201208877 polyether oxime, polyetheretherketone, etc. Among them, a film can be preferably used, and in terms of mechanical strength and dimensional stability, a polyester film which is processed, especially by biaxial stretching, is most preferable. Further, it is needless to say that the substrate is transparent, and it is also possible to foam a polyester film or a film containing a black pigment such as carbon black or another pigment. In this case, the substrate may be appropriately selected according to the use thereof, and when it is used as a light-shielding member, light reflection by a lens or the like in a synthetic tree portion of the cross-section of the member may adversely affect the light-shielding property. A black pigmented resin film containing carbon black or the like may be used, and in other cases, a transparent or foamed film may be used. In the present embodiment, since the light-shielding film itself can obtain sufficient light-shielding property as a member, black is contained in the synthetic resin film, and the synthetic resin film is black in a visual sense, and black is contained even when the light is about three. The pigment can be. Therefore, in the conventional synthetic resin film, a black pigment which impairs the physical properties of the substrate is contained, so that the physical properties of the synthetic resin film are not changed at low cost. The thickness of the substrate is preferably from 4 to 50 μm, and particularly preferably from 4 to 38 μm from the viewpoint of thinning. Moreover, by increasing the adhesion point to the light-shielding film, the substrate can also be subjected to an anchor treatment as needed. The light-shielding film formed on at least one side of the substrate contains a binder resin having a hydroxyl value (mgKOH/g) or more, carbon black, and an inorganic particle polyester which are thinly stretched and used as a resin. For example, when the synthetic resin of the high material is a light-shielding pigment, the concentration is not as the limit, but the viewpoint or the electric weight is 100, and flat.

S -8- 201208877 Resin particles having a particle size of 1 to 1 〇μηη. It is considered that the resin particles having an average particle diameter of 1 to ΙΟμηη are contained in the binder resin having a hydroxyl group value of 100 (mgKOH/g) or more, and the resin particles are not locally aggregated in the binder resin, but are uniformly dispersed. . As a result, the dispersion of the resin particles is good as a whole of the light-shielding film. Even if it is used as a light-shielding member, local bending and deformation are less likely to occur, and the elasticity is strong. In this regard, it is also considered that the light-shielding film contains a dispersing agent for uniformly dispersing the particles. However, if the method is used, the amount of the dispersing agent added to the light-shielding film will cause the relative content of other materials constituting the light-shielding film. reduce. Thus, the performance required for the light-shielding member such as matteness and slidability is deteriorated. On the other hand, according to the light-shielding member of the present invention, since the light-shielding film contains a binder resin having a hydroxyl group value of 100 (mgKOH/g) or more and a resin particle having an average particle diameter of 1 to 10 μm, since it is not excessive The use of the dispersant also allows the resin particles to be uniformly dispersed in the light-shielding film, so that the relative content ratio of the other materials constituting the light-shielding film can be reduced. Therefore, the light-shielding member ′ according to the present invention can be used without deteriorating the performance as a light-shielding member, and is elastic even if the light-shielding film is made thinner, and it is difficult to cause film breakage. As the binder resin having a hydroxyl value of 100 (mgKOH/g) or more, examples thereof include poly(meth)acrylic resin, polyester resin, polyvinyl acetate resin, polyvinyl chloride, polyvinyl butyral resin, and cellulose. Resin, polystyrene/polybutadiene resin, polyurethane resin, alkyd resin, acrylic acid resin, unsaturated polyester resin, epoxy ester resin, epoxy resin-9 - 201208877, ring Oxygen acrylic resin, urethane acrylate resin, polyester acrylate resin, polyether acrylate resin, phenol resin, melamine resin, urea resin, diallyl phthalate resin The thermoplastic resin or the thermosetting resin may be used alone or in combination of two or more. The hydroxy value of the binder resin is 100 (mgKOH/g) or more. By uniformly dispersing the resin particles having an average particle diameter of 1 to ΙΟμχη in the light-shielding film by making the valence of the hydroxy group of the binder resin to 100 Å (mg KOH/g) or more, it is possible to reduce the thickness of the light-shielding film. The entire member is also elastic and it is difficult to cause damage to the film. The hydroxyl value of the binder resin is preferably 125 (mgKOH/g) or more, more preferably 200 (mgKOH/g) or more from the viewpoint of further exerting elasticity. On the other hand, as for the upper limit, self-preventing bending stress From the viewpoint of reducing the brittleness of the coating film, it is preferably 250 (mgKOH/g) or less. The content of the binder resin having a hydroxyl group 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. When the content of the binder resin is 15% by weight or more in the light-shielding film, the adhesion between the substrate and the light-shielding film can be prevented from being lowered. On the other hand, the content of the binder resin is preferably 50% by weight or less in the light-shielding film, more preferably 45% by weight or less, still more preferably 40% by weight or less. By setting the content of the binder resin to 50% by weight or less in the light-shielding film, it is possible to prevent the physical properties of the light-shielding film such as light-shielding property, slidability, and matte property from being lowered. The carbon black contained in the light-shielding film is used to impart a light-shielding property to the binder resin while providing a light-shielding property while providing conductivity to prevent electricity generation due to static electricity.

-10- S 201208877 The average particle size of carbon black is preferably 1 μπι or less for better sufficient light-shielding, and more preferably 〇.5 μιη or less. The content of carbon black is preferably from 10% by weight to 50% by weight, more preferably from 15% by weight to 45% by weight, based on the light-shielding film. In the light-shielding film, when the amount is 10% by weight or more, the light-shielding property and the electrical conductivity are prevented from being lowered, and when it is 50% by weight or less, the adhesion and the scratch resistance can be improved, and the coating film strength can be prevented from being lowered and the cost can be increased. The inorganic particles contained in the light-shielding film are formed by forming fine concavities on the surface, and the reflection of the incident light is reduced to lower the surface glossiness (mirror gloss), and the matte property as a light-shielding member is improved. Examples of the inorganic particles include cerium oxide, magnesium metasilicate aluminate, and titanium oxide. Among these, cerium oxide is preferably used from the viewpoint of particle dispersibility and low cost. The average particle diameter of the inorganic particles may be one or a mixture of two or more, preferably from 1 μm to 10 μm, more preferably from Ιμηη to 6 μιη. The reason for these ranges is that fine irregularities can be formed on the surface of the light-shielding member to obtain matting properties. The content of the inorganic particles is preferably from 0.5% by weight to 10% by weight, more preferably from 5% by weight to 5% by weight, based on the light-shielding film. When the light-shielding film is 0.5% by weight or more, the surface glossiness (mirror gloss) can be prevented from increasing and the matteness can be lowered. On the other hand, when it is 1% by weight or less, it is possible to prevent the particles from falling off due to sliding of the light shielding member, and to prevent scratches on the light shielding member body, thereby preventing deterioration of the dynamic sliding property. -11 - 201208877 In particular, in the case where high light-shielding property and slidability are required, the content of the inorganic particles is preferably 5% by weight or less in the light-shielding film from the above range. In the inorganic particles used in the present embodiment, the high extinction property can be obtained in a small amount as described above. Therefore, when the amount is 5% by weight or less, sufficient matting properties can be obtained, and the carbon black and the resin particles described later can be relatively contained. The rate is increased without lowering the elasticity and the physical properties such as light blocking property and slidability can be improved. The resin particles having an average particle diameter of 1 to 1 〇μηη contained in the light-shielding film are used to improve the surface slidability of the light-shielding member, and the frictional resistance at the time of operation is reduced and the surface scratch resistance is improved during processing of the diaphragm member or the like. By. In addition, when the resin particles and the binder resin having a hydroxyl group value of 100 (mgKOH/g) or more are used, the dispersion balance of the resin particles as the entire light-shielding film is good, and even if it is used as a light-shielding member, It is difficult to produce local bending and deformation, and it becomes a strong elasticity. Further, since it is difficult to cause local bending or deformation, it is difficult to cause thermal deformation. The average particle diameter of the resin particles is preferably 2 to 8 μm. Examples of the particles include a hydrocarbon slip agent such as polyvinyl hydrazine or alkane wax, a fatty acid slip agent such as stearic acid or 12-hydroxystearic acid, decyl oleate or erucamide. An amine-based slip agent, an ester-based slip agent such as stearic acid monoglyceride, an alcohol-based slip agent, a silicone resin particle, a fluorine-based resin particle such as a polytetrafluoroethylene wax, or a crosslinked polymethyl methacrylate Particles, crosslinked polystyrene particles, and the like. In these cases, it is preferred to use crosslinked polymethyl methacrylate particles as a light-shielding member. These particles may be used alone or in combination of two or more. Moreover, the average particle diameter of the resin particles is preferably larger than the average of the inorganic particles.

S -12- 201208877 Particle size, better difference between the two is μ 5 μιη or more. The reason why the average particle diameter of the resin particles is larger than the average particle diameter of the inorganic particles is that "the fine concavities and convexities formed by the inorganic particles are formed on the surface irregularities formed by the resin particles, so that the reflection of the incident light can be made more. Less sufficient mattility is obtained, and slidability is also obtained. The content of the resin particles is preferably from 3% by weight to 40% by weight, more preferably from 5% by weight to 5% by weight, based on the light-shielding film. When it is 3% by weight or more in the light-shielding film, slidability can be obtained by forming appropriate irregularities on the surface, and by setting it as 40% by weight or less, the relative content of carbon black can be increased, and elasticity can be obtained, and light-shielding property and conductivity can be prevented. Reduced sex. Further, the content of the resin particles in the binder resin is preferably from 20 to 150 parts by weight, more preferably from 30 to 90 parts by weight, based on 100 parts by weight of the binder resin. By having such a content ratio, it is possible to maintain the properties of the light-shielding member such as light-shielding property and conductivity, and to further improve the dispersion balance of the resin particles in the light-shielding film, and to provide a light-shielding member which is more excellent in elasticity. The light-shielding film formed on at least one side of the substrate may contain a flame retardant, an antibacterial agent, an antifungal agent, an antioxidant, a plasticizer, a flow agent, and a flow regulator if the function of the present invention is not impaired. Various additives such as defoamers and dispersants. The thickness of the light-shielding film is preferably from 3 μm to 30 μm, more preferably from 5 μm to 25 μm. By setting it to 3 μm or more, pinholes and the like can be prevented from occurring in the light-shielding film, and sufficient light-shielding property can be obtained. Further, by setting it to 3 μm or less, cracking of the light-shielding film can be prevented. -13- 201208877 The light-shielding member for an optical device according to the present embodiment can be applied by dip coating, roll coating, bar coating, die coating, or soft coating on one surface or both surfaces of a substrate. A conventionally known coating method such as air knife coating, which comprises applying a binder resin having a hydroxyl group value of 100 (mgKOH/g) or more, carbon black, inorganic particles, and resin particles having an average particle diameter of 1 to ΙΟμηι. The coating liquid for a light-shielding film is obtained by drying, heating, pressurization, etc. as needed. As the solvent of the coating liquid, water or an organic solvent, a mixture of water and an organic solvent, or the like can be used. As described above, since the light-shielding member for an optical device of the present embodiment contains a specific light-shielding film on at least one surface of the substrate, it has a matte property and can maintain the light-shielding property such as light-shielding property and slidability. A shutter or aperture member of an optical device such as a high-performance monocular reflex camera, a compact camera, a video camera, a mobile phone, or a projector is preferably used. In particular, since the light-shielding film of the present embodiment contains a binder resin having a hydroxyl group value of 100 (mgKOH/g) or more and a resin particle having an average particle diameter of 1 to 1 μm, it does not excessively contain a dispersant. Since the resin particles are uniformly dispersed, the performance of the light-shielding member is not impaired, and the light-shielding member which is elastic even if it is thinned and which is less likely to cause damage of the film can be obtained. As a result, it has become a shutter, a diaphragm member, and the like which can be preferably used in a camera-equipped mobile phone which has been required to be thinned in recent years. Further, since local bending and deformation are less likely to occur, it is possible to cause thermal deformation. EXAMPLES Hereinafter, the present invention will be more specifically described by way of examples. And, "parts",

S -14- 201208877 %" is the weight basis unless otherwise indicated. 1. Production of light-shielding member [Example 1] A black polyethylene terephthalate film (LUMIRROR®-30, TORAY Co., Ltd.) having a thickness of 25 μχ was used as a substrate, and a rod was coated on both sides of the substrate. In the cloth method, a coating liquid for a light-shielding film having the following prescription was applied and dried to form a light-shielding film, and a light-shielding member for an optical device of Example 1 was produced. <Coating liquid for light-shielding film of Example 1> • 9.68 parts of polyester polyol (BURNOCK 11-408: DIC company, hydroxyl group price 200 (mgKOH/g), solid content 70%) • Isocyanate 9.3 7 parts ( BURNOCKDN980: DIC company, solid content 75%) • Carbon black 4.57 parts (BALKAN XC-72: CABOT) • Inorganic particles (cerium oxide) 0.89 parts (TS100: Japan EPONICDEGASSA company, average particle size 4μιη) • Resin particles ( Cross-linked polymethyl methacrylate particles) 5.30 parts (CHEMSNOW ΜΧ-500: comprehensive chemical company, average particle size 5 μιη) • methyl ethyl hydrazine 36.93 parts 1 5.8 3 parts • toluene-15-201208877 [Example 2 In the coating liquid for a light-shielding film used in Example 1, the polyester polyol was changed to a polyester polyol (BURNOCK J-517: DIC Company's hydroxyl number 140 (mgKOH/g), solid content 70%), A light-shielding member for an optical device of Example 2 was produced in the same manner as in Example 1 except that the amount of the isocyanate added was 6.56 parts by weight. [Example 3] In the coating liquid for a light-shielding film used in Example 1, the polyester polyol was changed to a polyester polyol (BURNOCK D-144-65BA: DIC Corporation, a hydroxyl value of 100 (mgKOH/g), A light-shielding member for an optical device of Example 3 was produced in the same manner as in Example 1 except that the amount of the solid component was changed to 10.42 parts by weight and the amount of the isocyanate added was 5.04 parts by weight. [Example 4] In the coating liquid for a light-shielding film used in Example 1, the resin particles were changed to resin particles (cross-linked polymethyl methacrylate particles, CHEMSNOW MX-1 50: comprehensive chemical company, average particle) A light-shielding member for an optical device of Example 4 was produced in the same manner as in Example 1 except that the diameter was 1.5 μm. [Example 5]

In the coating liquid for a light-shielding film used in Example 1, the resin particles were changed into resin particles (crosslinked polymethyl methacrylate particles, CHEMSNOW)

-16-S 201208877 MX-1 000: In addition to the average particle diameter of 1 Ομιη, the light-shielding member for optical devices of Example 5 was produced in the same manner as in Example 1. [Example 6] The coating liquid for a light-shielding film used in Example 1 was produced in the same manner as in Example 1 except that the amount of the acrylic polyol added was 100 parts by weight and the amount of the resin particles added was 13 parts by weight. A light shielding member for an optical device of Example 6. [Comparative Example 1] The polyester polyol was changed to an acrylic polyol in the coating liquid for a light-shielding film used in Example 1 (ACRY DIC KA - 8 0 1 P: DIC Corporation, hydroxyl number 50 (11^1 < A light-shielding member for an optical device of Comparative Example 1 was produced in the same manner as in Example 1 except that the amount of the solid component was changed to 13.55 parts by weight and the amount of the isocyanate added was 3.28 parts by weight. [Comparative Example 2] In the coating liquid for a light-shielding film used in Example 1, 'the resin particles were changed to resin particles (cross-linked polymethyl methacrylate particles) CHEMSNOW MX-1 500H: Comprehensive Chemical Co., Ltd., average particle A light shielding member for an optical device of Comparative Example 2 was produced in the same manner as in Example 1 except that the diameter was 1 5 μm. [Comparative Example 3] In addition to the inorganic particles (barium sulfate, BMH: 堺Chemical Industries, Inc., average particle size 2.5 μηι), the resin particles were changed to -17-201208877 in the coating liquid for a light-shielding film used in Example 1. A light-shielding member for an optical device of Comparative Example 3 was produced in the same manner as in Example 1. 2. Evaluation The light-shielding members for optical devices obtained in the above Examples 1 to 6 and Comparative Examples 1 to 3 were evaluated by the following methods. The results are shown in Table 1. (1) Light-shielding property The optical density of the optical device for optical devices obtained in the above Examples 1 to 6 and Comparative Examples 1 to 3 was measured using an optical densitometer (TD-904: GretagMacbeth Co., Ltd.) based on JIS Κ 765 1:1 988. When the optical density exceeds 4.0, those who cannot measure the area concentration are marked as "〇", and those who are 4.0 or less are referred to as "X". Further, a UV filter was used for the measurement. The measurement results are shown in Table 1. (2) Dulling property The surface glossiness (mirror gloss) of the light-shielding member for optical devices obtained in Examples 1 to 6 and Comparative Examples 1 to 3 was measured based on JIS Z874 1 : 1 997. The glossiness was less than 1 〇 (%) The person who wrote it is "〇J, and those who are 1 〇 (%) or more are marked as "X". The measurement results are shown in Table 1. (3) Slidability Based on JIS Κ7125:1999, the six obtained in Examples 1 to 6 and Comparative Examples 1 to 3 were measured under the conditions of a load of 200 (g) and a speed of 100 (m m / m i η ):

-18- S 201208877 The static friction coefficient (PS) of the shading member for the machine is 'moving friction coefficient (μίς). Those whose static friction coefficient (μβ) is less than 〇·35 are marked as “〇”, and those above 〇.35 are marked as “X”. Further, if the dynamic friction coefficient (Pk) is less than 〇30, it is denoted as r 〇", and if it is 0.3 or more, it is recorded as "x". The measurement results are shown in Table 1. (4) Elastomeric strength The light-shielding members for optical devices obtained in Examples 1 to 6 and Comparative Examples 1 to 3 were subjected to samples of Examples 1 to 6 and Comparative Examples 1 to 3 having a width of 1.5 cm and a length of 20 cm, and the samples were sampled. a cylindrical shape wound in two directions in each longitudinal direction, and the sample is not overlapped by a triple weight, and is located at a position centered on the end side of the sample existing on the outermost surface of the cylindrical sample, and then has a width of 1.5 cm. Polyester tape of Scrn (NICHIBAN Co., Ltd.), samples of Examples 1 to 6 and Comparative Examples 1 to 3 having a width (height) of 1.5 cm and a diameter of about 3.2 cm were prepared. Next, a commercially available electronic balance was prepared. (BX3 20 0D: Shimadzu Corporation) The measuring unit 3 and the upper fixing unit 2 have a measuring device 1 shown in Fig. 1 in which the gap between the measuring unit 3 and the upper fixing portion is 2 cm. In the gap between the measuring unit 3 and the upper fixing portion 2 of the measuring device 10, the diameter is placed such that the cylindrical side surface contacts the measuring unit 3 and the upper fixing portion 2 of the measuring device 1 The sample 1 of the cylindrical example 1 and the comparative examples 1 to 3 of about 3.2 cm was measured from the elastic force of the sample 1 to measure the amount of the electronic balance of the measuring unit 3 after 1 second. As a result of the measurement, if the measured amount is U or more, it is marked as "◎", and 0.7 g or more - if it is less than lg, it is marked as "〇". If it is less than 〇. 7g, it is marked as "X". The measurement results are shown in Table 1. _ 19 _ 201208877 (5) Durability The light-shielding member for optical devices obtained in Examples 1 to 6 and Comparative Examples 1 to 3 was used as a diaphragm member of a camera, and the light-shielding member for an optical device after 5 thousand operations was visually confirmed. Whether there is deformation or damage. Those who are not deformed or damaged are marked as "△", and those who are deformed or damaged are marked as "X". For those who have no deformation or damage, perform 20,000 more movements, and then confirm that there is no deformation or damage when visually confirmed, as "〇", and then perform 25,000 times of movement again, and then visually confirm that there is no deformation or The damage is recorded as "◎". The results of the measurements are shown in Table 1. (6) Thermal deformation A light-shielding member for an optical device in which the light-shielding films obtained in Examples 1 to 6 and Comparative Examples 1 to 3 were prepared on one surface of the substrate. The cutting length was lOcmxlOcm, and it was left to stand in an environment of 80 ° C for 5 minutes, and the amount of curl at the end was measured. The total amount of the curl is 〇mm or more to less than 30 mm, and it is "〇". If it is 30 mm or more, it is marked as "x". The measurement results are shown in Table 1. (7) Adhesiveness The light-shielding film and the substrate of the light-shielding member for optical devices obtained in Examples 1 to 6 and Comparative Examples 1 to 3 were measured and evaluated based on the checkerboard tape method in JIS 5 6 0 - 5 - 6. Follow-up. If the area of the checkerboard is more than 1%, the stripper is marked as "X", and if it is 5% or more and less than 10%, it is marked as "△", and if it is less than 5%, it is marked as "〇" ^

S -20- 201208877 [Table 1] opaque matting slip 1 Intercepting elastic strength Durability Thermal deformation Adhesive static friction coefficient Dynamic friction coefficient Example 1 〇〇〇〇 ◎ ◎ 〇〇 Example 2 〇〇〇〇 ◎ 〇〇 〇 Example 3 〇〇〇〇〇〇〇〇 Example 4 〇〇〇〇 ◎ ◎ 0 〇 Example 5 〇〇Γ 〇〇 ◎ © 0 〇 Example 6 〇〇 0 〇〇 △ 〇〇 Comparative Example 1 〇 〇〇〇 XX 〇 X Comparative Example 2 0 〇 0 0 XXX Δ Comparative Example 3 〇〇〇〇 XXX Δ From the results of Table 1, it is understood that the light-shielding members for optical devices obtained in Examples 1 to 6 are included in the synthesis. a substrate made of a resin film and a light-shielding film formed on at least one surface of the substrate, wherein the light-shielding film contains a binder resin having a hydroxyl group value of 100 (mgKOH/g) or more, carbon black, inorganic particles, and When the average particle diameter is from 1 to ΙΟμπι, it is a light-shielding member which exhibits light-shielding properties and matte properties, and is excellent in durability even if it is thinner and has excellent durability. A film breakage are likely to occur. In particular, in the light-shielding members for optical devices of Examples 1, 2, 4, and 5, since the hydroxyl value of the binder resin is 125 (mgKOH/g) or more, the elastic strength is particularly high, and further, Example 1 In the light-shielding members for optical devices of 4 and 5, since the hydroxyl resin content of the binder resin is 200 (mgKOH/g) or more, the elastic strength is particularly high and the durability is particularly high. On the other hand, in the light-shielding member for an optical device of Comparative Example 1, since the binder resin having a hydroxyl group value of less than 100 (mgKOH/g) was used, the fine particles could not be uniformly dispersed in the light-shielding film, and the elasticity was weak. Moreover, it is also a lack of durability. C: -21 - 201208877 Further, in the light-shielding member for an optical device of Comparative Example 2, since the resin particles having an average particle diameter exceeding ΐΟμ"1 are used, the fine particles are not uniformly dispersed in the light-shielding film, and the elasticity is weak. Moreover, it is also a lack of durability. Further, in the light-shielding member for an optical device of Comparative Example 3, since inorganic particles are not used instead of the resin particles, the fine particles are not uniformly dispersed in the light-shielding film, and the elasticity is weak. Moreover, it is also a lack of durability. In the light-shielding member for optical devices obtained in Examples 1 to 6, the light-shielding film is a binder resin containing a hydroxyl group of 100 (mgKOH/g) or more, carbon black, inorganic particles, and an average particle diameter of 1 to ΙΟμιη. In the case of the resin particles, the resin particles can be uniformly dispersed in the light-shielding film. When the light-shielding film is provided on one surface of the substrate as a light-shielding member, local bending and deformation are less likely to occur, and it is difficult to cause thermal deformation. . In the light-shielding member for an optical device obtained in Comparative Example 1, since the proportion of the pigment in the light-shielding film is high, it is difficult to cause thermal deformation due to the binder resin. However, since the ratio of the pigment is high and the resin particles are difficult to be uniformly dispersed, the adhesion to the substrate is deteriorated. In the light-shielding members for optical devices obtained in Comparative Examples 2 and 3, the pigment ratio in the light-shielding film is the same as that of the light-shielding member for optical devices obtained in Example 1, but is not a resin having an average particle diameter of 1 to 1 μm In the case of particles, the resin particles are not uniformly dispersed in the coating film, and local bending and deformation occur, which may cause thermal deformation. Further, the adhesion to the substrate was inferior to that of Example 1. [Simple description of the map]

S -22- 201208877 Fig. 1 is a view for explaining a measuring device for measuring the elastic strength of a light shielding member for an optical device. [Description of main component symbols] 1: Light-shielding member for optical device according to the present invention 2: Upper fixing portion 3: Measuring portion 1 〇 : Measuring device

Claims (1)

201208877 VII. Patent application scope: 1. A light-shielding member for an optical device, comprising: a substrate made of a synthetic resin film; and a light-shielding film formed on at least one side of the substrate, wherein: The light-shielding film contains a binder resin having a hydroxyl value of 100 (mgKOH/g) or more, carbon black, inorganic particles, and resin particles having an average particle diameter of ι~ι〇μπι. 2. The light-shielding member for an optical device according to claim 1, wherein the resin particles are cross-linked polymethyl methacrylate particles. 3. The light-shielding member for an optical device according to claim 1 or 2, wherein the resin particles are contained in an amount of 20 to 150 parts by weight based on 100 parts by weight of the binder resin. S