JP5498127B2 - Light shielding member for optical equipment - Google Patents

Description

  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.

  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 such a diaphragm for 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).

JP-A-9-274218 WO2006 / 016555

  In the light-shielding film according to the conventional method described above, a large amount of lubricant must be contained in the light-shielding film in order to improve the slidability. As a result, it was unavoidable to reduce the content of fine particles in the light-shielding film, and even though the light-shielding property was good, the matte property could not be sufficiently expressed.

  By the way, in recent years, when a lens is mounted on a camera of a mobile phone or the like, attention is paid to mounting by reflow soldering when the lens is mounted on a substrate. The reflow solder is a mounting method in which cream-like solder is applied to a substrate and then passed through a high-temperature reflow furnace to melt and bond the solder. According to the lens mounting method using reflow soldering, the productivity of the camera-equipped mobile phone can be significantly improved as compared with the conventional mounting method.

  When a light-shielding film is mounted on a mobile phone camera, the light-shielding film is required to have high heat resistance enough to withstand the above-described lens mounting conditions by reflow soldering. However, in the light-shielding film according to the conventional method described above, since it is necessary to contain a large amount of lubricant in the light-shielding film, the content of the binder resin in the light-shielding film is lowered, and as a result, the adhesiveness is not sufficient. .

  The problem to be solved by the invention is to provide a light-shielding member for optical equipment that has high slidability, retains the properties of the light-shielding film such as light-shielding property and matte property, and is excellent in heat resistance and adhesiveness. Is to provide.

  The present inventors have found that by using a specific particulate lubricant, high slidability can be expressed despite a small amount of blending. The reason is not clear, but by selecting and using fluororesin particles from among a number of particulate lubricants, high slidability can be obtained with a small amount of formulation, resulting in an increase in the content of fine particles in the light shielding film. It has been found that the physical properties of the light-shielding film such as light-shielding properties and matte properties can be maintained. In addition, as a relative effect of reducing the blending amount of the lubricant, it succeeded in increasing the amount of the binder resin in the light shielding film. As a result, it was found that the heat resistance and adhesion of the light shielding film can be improved, and that it can contribute to the improvement of the wear resistance of the light shielding film.

  That is, this invention solves the said subject by the following solution means. In the following solution means, reference numerals corresponding to the drawings showing the embodiments of the invention will be attached and described. However, the reference numerals are only for facilitating the understanding of the invention and are not intended to limit the invention. Absent.

  The light shielding member (1) for an optical device according to the invention has a film substrate (2) and a light shielding film (3) formed on at least one surface of the substrate. The light shielding film (3) contains a binder resin, carbon black (31), fluororesin particles (32), and fine particles (33). The contents of the binder resin and the fluororesin particles (32) are 65% by weight or more and 5 to 15% by weight, respectively. The weight ratio of the fluororesin particles (32) to the fine particles (33) is 5 or less, ie, the fluororesin particles (32) / the fine particles (33).

  In the said invention, the content rate of the fluororesin particle | grains (32) in a light shielding film (3) can be 10 weight% or less. Moreover, the weight ratio of the fluororesin particles (32) and the fine particles (33) in the light shielding film (3) can be 3 or less by the fluororesin particles (32) / fine particles (33). Moreover, a thing with an average particle diameter of 5-10 micrometers can be used as a fluororesin particle | grain (32). Moreover, the content rate of carbon black and microparticles | fine-particles (33) in a light shielding film (3) can be 5-20 weight% and 1-10 weight%, respectively. Moreover, binder resin can be comprised with a thermosetting resin. Moreover, a film base material (2) can be comprised with a polyimide film. Further, fine particles (33) having an oil absorption of 250 (g / 100 g) or more can be used.

  According to the above invention, the inclusion of specific particulate lubricant, that is, fluororesin particles, in the light-shielding film results in high slidability with a small amount of blending, resulting in an increase in the content of fine particles in the light-shielding film. Therefore, it is possible to obtain a light-shielding member for optical equipment that has high slidability and retains the properties of the light-shielding film such as light-shielding property, adhesive property, and matte property.

  In addition, as a relative effect of reducing the amount of lubricant in the light shielding film, the amount of binder resin (especially thermosetting resin) in the light shielding film can be increased, resulting in adhesion of the light shielding film. And wear resistance can be improved.

  Therefore, the light shielding member for an optical device according to the invention can be suitably used for a high-performance single-lens reflex camera, a compact camera, a video camera, a mobile phone, a projector, and the like. Particularly, it is preferable for use in a camera-equipped mobile phone, which has recently been required to be fitted with a lens by reflow soldering.

FIG. 1 is a cross-sectional view showing a light shielding member for an optical apparatus according to the present embodiment.

  Hereinafter, a light shielding member for optical equipment according to an embodiment of the invention will be described.

《Light shielding member for optical equipment》
As shown in FIG. 1, the light shielding member 1 for an optical device according to the present embodiment has a base material 2. A light shielding film 3 is formed on at least one surface of the substrate 2.

"Base material"
Examples of the usable substrate 2 include synthetic resin films such as a polyester film, a polyimide film, a polystyrene film, and a polycarbonate film. 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. Moreover, a polyimide film is used suitably for the use for a heat resistant use. In recent years, when a lens is mounted on a camera of a mobile phone or the like, as described above, mounting by reflow soldering has attracted attention when mounting the lens on a substrate.

  Further, as the base material 2, a transparent resin film, a foamed polyester film, a synthetic resin film containing a black pigment such as carbon black, and other pigments can be used. In this case, the above-mentioned base material 2 can select a suitable thing according to each use. For example, when it is used as the light shielding member 1, the light collected by the lens or the like is reflected on the synthetic resin film portion of the member cross section and adversely affected. A pigment-containing synthetic resin film can be used, and in other cases, a transparent or foamed synthetic resin film can be used.

  In the present embodiment, since the light-shielding film 3 itself provides sufficient light-shielding properties as the light-shielding member 1, when the synthetic resin film contains a black pigment, the synthetic resin film appears to be black visually, That is, it may be contained so that the optical density is about 3. Therefore, since the black pigment is not included in the synthetic resin film until the limit that the physical properties as the substrate 2 are impaired as in the prior art, it can be obtained at low cost without changing the physical properties of the synthetic resin film.

  Although the thickness of the base material 2 changes with uses to be used, it is generally preferable to set it as 25 micrometers-250 micrometers from viewpoints, such as an intensity | strength and rigidity as the lightweight light-shielding member 1. FIG.

  Moreover, from a viewpoint of improving adhesiveness with the light shielding film 3, the base material 2 can also be subjected to anchor treatment or corona treatment as necessary.

《Light-shielding film》
The light-shielding film 3 formed on at least one surface of the substrate 2 contains a binder resin, carbon black, a particulate lubricant 32 and a matting agent 33. In FIG. 1, the binder resin and carbon black are collectively denoted by reference numeral “31”.

<Binder resin>
Examples of the binder resin contained in the light-shielding film 3 include poly (meth) acrylic acid resin, polyester resin, polyvinyl acetate resin, polyvinyl chloride, polyvinyl butyral resin, cellulose resin, polystyrene / polybutadiene resin, polyurethane resin, and 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, urea resin, A thermoplastic resin such as diallyl phthalate resin or a thermosetting resin may be used, and one or more of these may be used in combination. In particular, when used for heat resistant applications, thermosetting resins are preferably used.

  The content of the binder resin in the light shielding film 3 is preferably 50% by weight or more, more preferably 65% by weight or more, and further preferably 70% by weight or more. By making the content rate of the binder resin 50% by weight or more in the light shielding film 3, it is possible to prevent the adhesiveness between the substrate 2 and the light shielding film 3 from being lowered. On the other hand, the content of the binder resin in the light-shielding film 3 is preferably 85% by weight or less, more preferably 80% by weight or less, and still more preferably 75% by weight or less. By setting the content of the binder resin to 85% by weight or less in the light shielding film 3, it is possible to prevent physical properties of the light shielding film such as light shielding properties, slidability, and matte properties from being deteriorated. In particular, in this embodiment, by selecting fluororesin particles as the lubricant 33 as described later, it is possible to ensure high slidability even if the content of the lubricant 33 in the light shielding film 3 is kept low. As a relative effect, the content of the binder resin can be increased (for example, 65% by weight or more) as compared with the prior art. As a result, the light shielding film 3 can contribute to improvement in adhesion and wear resistance.

"Carbon black"
The carbon black contained in the light-shielding film 3 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 μm or less, and more preferably 0.5 μm or less, in order to obtain sufficient light shielding properties. In addition, the average particle diameter in this specification has pointed out the median diameter (D50) measured with a laser diffraction type particle size distribution measuring apparatus (for example, Shimadzu Corporation SALD-7000 etc.). The same applies to lubricants and fine particles.

  The content of carbon black is preferably 5% by weight to 20% by weight in the light shielding film 3, and more preferably 10% by weight to 20% by weight. By making it 5% by weight or more in the light shielding film 3, it is possible to prevent the light shielding property and the conductivity from being lowered, and by making it 20% by weight or less, the adhesiveness and wear resistance are improved. Further, it is possible to prevent a decrease in coating film strength and an increase in cost.

<Fine particles>
The fine particles 33 contained in the light shielding film 3 reduce the reflection of incident light by forming fine irregularities on the surface, thereby reducing the glossiness of the surface (specular glossiness), and matte when the light shielding member 1 is formed. It is for improving the property.

  The fine particles 33 are indispensable for imparting the matte surface of the light shielding member 1, but the ratio that can be contained in the light shielding film 3 is limited as follows. First, when the content ratio of the fine particles 33 is increased without changing the ratio of the resin and other components, the content ratio of the carbon black 31, the lubricant 32, etc. is decreased accordingly. Degradation of physical properties such as slidability. Further, in order to maintain physical properties such as light shielding properties, when the content of fine particles 33 is increased by decreasing the binder resin content while maintaining the carbon black and lubricant content in the light shielding film, The adhesiveness between the material 2 and the light shielding film 3 is lacking, and the wear resistance is deteriorated. That is, if the light shielding film 3 contains a sufficient amount of the fine particles 33 to give matting properties, physical properties such as light shielding properties and sliding properties cannot be maintained, or wear resistance is poor. become.

  In the present embodiment, fine particles having a large oil absorption amount can be used. Specifically, fine particles 33 having an oil absorption amount of preferably 250 (g / 100 g) or more, more preferably an oil absorption amount of 300 (g / 100 g) or more can be used. When the fine particles 33 having a large oil absorption amount are used, the matte property of the surface can be obtained with a small amount, and the contents of the carbon black 31, the lubricant 32, etc. in the light shielding film 3 can be increased. As a result, the light-shielding film 3 can fully exhibit physical properties such as light-shielding property and slidability while having the matte property. In addition, the oil absorption amount mentioned above is based on ISO787 / V-1968, and is the amount (g) of oil necessary for wet mixing linseed oil with 100 g of fine particles 33 to form a hard paste.

  As such fine particles 33, any organic type such as crosslinked acrylic beads, inorganic type such as silica, magnesium aluminate metasilicate, and titanium oxide can be used, but inorganic type is more preferable, among them From the viewpoints of fine particle dispersibility and low cost, it is preferable to use silica. Moreover, these 1 type (s) or 2 or more types can also be mixed and used.

  The primary particle size or the secondary particle size of the fine particles 33 is preferably 1 μm to 10 μm, and more preferably 1 μm to 6 μm. It is because by setting it as such a range, a fine unevenness | corrugation is formed in the surface of the light shielding member 1, and matte property is acquired. The secondary particles mean particles formed by agglomeration of primary particles. The primary particle diameter or the secondary particle diameter can be determined by photography using a transmission electron microscope, but is simple. Specifically, it can be measured as the number median diameter using a laser scattering type particle size distribution meter (for example, trade name “LA300” manufactured by HORIBA).

  The content of the fine particles 33 is preferably 1 wt% to 10 wt% in the light shielding film 3, and more preferably 1 wt% to 5 wt%. By making it 1% by weight or more in the light-shielding film 3, it is possible to prevent the surface glossiness (mirror glossiness) from increasing and delustering to be lowered, and by making it 10% by weight or less, It is possible to prevent the fine particles 33 from falling off due to the sliding of the light shielding member 1 or causing the slidability to deteriorate.

  In particular, when high light-shielding properties and slidability are required, the content of the fine particles 33 is preferably 3% by weight or less in the light-shielding film 3 from the above range. Since the fine particles 33 used in the present embodiment can obtain a high matte property even in a small amount as described above, by setting the amount to 3% by weight or less, a sufficient matte property can be obtained, and relatively, carbon black 31 and the content of the lubricant 32 can be increased, and physical properties such as light-shielding property and sliding property can be improved.

《Lubricant》
The particulate lubricant 32 contained in the light-shielding film 3 improves the slidability of the surface of the light-shielding member 1, reduces the frictional resistance during operation when processed into a diaphragm member, etc., and wear resistance of the surface. It is for improving the property.

  In the present embodiment, fluororesin particles are used as the particulate lubricant 32. Note that the fluororesin particles include particles containing a fluororesin. The present inventors select and use fluororesin particles from among a number of particulate lubricants as the particulate lubricant 32 to be contained in the light shielding film 3, thereby allowing the content of the lubricant 32 in the light shielding film 3 to be used. It has been found that even if the amount is reduced (reduced by about 40% compared to the conventional case), high slidability can be exhibited.

  Examples of the fluororesin particles include polytetrafluoroethylene (PTFE), polytrifluoride ethylene (PCTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), polyethylene tetrafluoride ethylene copolymer (ETFE). ), Polytetrafluoroethylene / hexafluoropropylene copolymer (FEP), and the like.

  As polytetrafluoroethylene, for example, resin wax commercially available from Shamrock Technology (USA), Hoechst Japan, or the like can be used. Specifically, for example, there is a SST series of a commercial product “Shamrock Wax” manufactured by Shamrock Technology, a TF series of a commercial product “Hostaflon” manufactured by Hoechst Japan. Examples of the SST series include “SST-1MG” (particle size of about 1 to 2 μm), “SST-2” (particle size of about 12.5 μm), “SST-2P” (particle size of about 12.5 μm), “ “SST-2D” (particle size about 9 μm), “SST-3” (particle size about 5 μm), “SST-3D” (particle size about 5 μm), “SST-3P” (particle size about 5 μm), “SST- 3H "(particle size of about 5 µm)," SST-4 "(particle size of about 4 µm)," SST-4MG "(particle size of about 2 to 4 µm), and the like. Examples of the TF series include “TF9202” (particle size of about 2.5 μm), “TF9205” (particle size of about 5 μm), and the like.

  Examples of those containing polytetrafluoroethylene include the above-mentioned “Shamrock Wax” FLUOROSLIP series. Specifically, “225 (PTFE / PE, particle size of about 12.5 μm)”, “ 231 (PTFE / PE, particle size about 6 μm) ”,“ 245 (PTFE / PE, particle size about 12.5 μm) ”,“ 285 (PTFE / PE, particle size about 12.5 μm) ”,“ 421T (PTFE / PE, particle size of about 6 μm), “425 (PTFE / PE, particle size of about 12.5 μm)”, “511 (PTFE / PE, particle size of about 6 μm)”, “722MG (PTFE / PE, particle size of about 5 μm) ) ”,“ 731MG (PTFE / PE, particle size of about 3 to 4 μm) ”and the like. Each said particle size shows an average particle size.

  It should be noted that organic lubricants and inorganic lubricants known as known particulate lubricants other than the above-described fluororesin particles can be used by blending them in appropriate amounts with the fluororesin particles. In this case, it can mix | blend so that it may become about 100 parts or less by weight ratio with respect to 100 parts of fluororesin particles. When the blending amount of other lubricant components other than the fluororesin particles is increased, the effect of using the fluororesin particles in the present embodiment may be impaired.

  1-20 micrometers is preferable, as for the average particle diameter of a fluororesin particle, More preferably, it is 3-15 micrometers, More preferably, it is 5-10 micrometers. By using fluororesin particles having an average particle diameter in this range, appropriate irregularities are formed on the surface, and the sliding performance is further improved (for example, the dynamic friction coefficient is further reduced).

  The content of the fluororesin particles is preferably 5% by weight or more, more preferably 10% by weight or more in the light shielding film 3. By setting the content in the light-shielding film 3 to 5% by weight or more, appropriate irregularities are formed on the surface, and slidability can be obtained. In the present embodiment, high slidability is obtained even when the content of the fluororesin particles is preferably 15% by weight or less, more preferably 13% by weight or less, and further preferably 10% by weight or less in the light shielding film 3. Can do. Since the fluororesin particles used as the lubricant 32 in the present embodiment can obtain high slidability even in a small amount as described above, sufficient slidability can be obtained by setting the amount to 15% by weight or less. In particular, it is possible to increase the content of carbon black, fine particles 33 and binder resin, which can contribute to improvement in heat resistance and wear resistance of the light shielding film 3 in addition to light shielding properties and matting properties.

  In the present embodiment, the weight ratio of the fluororesin particles to the fine particles 33 (fluororesin particles / fine particles) in the light shielding film 3 is preferably 5 or less (excluding 0), more preferably 4 or less (excluding 0), More preferably, it is adjusted to be 3 or less (excluding 0) and a value smaller than that of the prior art (for example, 6 or more) (however, preferably 1 or more, more preferably 2 or more). By adjusting the weight ratio of the fluororesin particles and the fine particles 33 in the light shielding film 3 to the above-described predetermined range with the fluororesin particles / fine particles, the light shielding property, the sliding property and the matte property are maintained at a high level. Thus, the heat resistance and wear resistance of the light shielding film 3 can be improved. Such effects can be expressed as a relative effect of selecting fluororesin particles as the lubricant 32 included in the light shielding film 3 and reducing the content in the light shielding film 3 as described above. This is because it becomes possible to increase the content of the binder resin. By increasing the content of the binder resin in the light shielding film 3, it is considered that the adhesion of the light shielding film 3 to the base material 2 is further improved, thereby improving the wear resistance of the light shielding film 3. . In particular, the heat resistance of the light shielding film 3 is improved by using a thermosetting resin as the binder resin.

  The weight ratio between the fluororesin particles and the fine particles 33 in the light-shielding film 3 is preferably 1 or more so that the light-shielding property, the sliding property and the matte property are maintained at a high level, and the light-shielding film 3 It is possible to improve the heat resistance, wear resistance, and adhesiveness.

《Other ingredients》
The light-shielding film 3 formed on at least one surface of the base material 2 is a flame retardant, antibacterial agent, antifungal agent, antioxidant, plasticizer, leveling agent, flow control as long as the function of the present invention is not impaired. Various additives such as an agent, an antifoaming agent and a dispersing agent can be contained.

  The thickness of the light shielding film 3 is preferably 5 μm to 30 μm, and more preferably 5 μm to 20 μm. By setting the thickness to 5 μm or more, it is possible to prevent a pinhole or the like from being generated in the light shielding film 3 and to obtain a sufficient light shielding property. Moreover, it can prevent that the light shielding film 3 produces a crack by setting it as 30 micrometers or less.

  The light shielding member 1 for an optical device according to the present embodiment dip coats a coating solution for a light shielding film containing the binder resin, carbon black 31, particulate lubricant 32 and fine particles 33 as described above on one side or both sides of a substrate 2. It can be obtained by applying by conventional coating methods such as roll coating, bar coating, die coating, blade coating, air knife coating and the like, drying and then heating / pressing as necessary. 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.

  As described above, since the light-shielding member 1 for an optical device according to this embodiment has the specific light-shielding film 3 on at least one surface of the base material 2, the light-shielding property, the slidability, etc. are provided while having a matte property. Since it retains the physical properties of the light-shielding film, 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. In particular, since the light-shielding film 3 of the present embodiment contains fluororesin particles that can exhibit high slidability even with a small amount as the lubricant 32, the content of the binder resin in the light-shielding film 3 can be increased. In particular, a light-shielding film having excellent heat resistance and wear resistance can be obtained. As a result, it is suitable for use as a shutter or diaphragm member of a camera-equipped mobile phone that has recently been required to be fitted with a lens by reflow soldering.

  The following examples further illustrate the present invention. “Parts” and “%” are based on weight unless otherwise specified.

1. Production of light shielding member for optical device [Experimental Examples 1 to 8]
As a substrate, a polyimide film (Kapton 200H: Toray DuPont) having a thickness of 50 μm is used, and the coating liquids a to h for the light-shielding film having the following prescriptions on both sides thereof are each 10 μm after drying by the bar coating method. The light shielding films A to H were formed by coating and drying as described above, and light shielding members for optical devices of respective experimental examples were produced. Table 1 shows the contents (parts) of acrylic polyol and the like in the coating solution for the light-shielding film having the following formulation. Table 2 shows the content (%) of acrylic polyol and the like in the formed light shielding film.

<Prescription of coating liquids a to h for light shielding film>
Acrylic polyol (solid content 50%) (Parts listed in Table 1)
(Acridic A804: Dainippon Ink & Chemicals, Inc.)
・ Isocyanate (solid content 75%) (part shown in Table 1)
(Bernock DN980: Dainippon Ink & Chemicals, Inc.)
・ Carbon black (parts listed in Table 1)
(Vulcan XC-72R: Cabot Corporation)
・ Lubricant (Parts listed in Table 1)
(Lubricants listed in Table 1)
・ Fine particles (silica) (Parts listed in Table 1)
(ACEMATT TS100: Evonik, average particle size 4 μm, oil absorption 390 (g / 100 g))
・ Methyl ethyl ketone 60 parts ・ Toluene 40 parts

  In Tables 1 and 2, the lubricant P indicates Shamrock SST-3D (Shamrock Technology, fluororesin particles, average particle size 5 μm). Lubricant Q indicates Shamrock SST-2D (Shamrock Technology, fluororesin particles, average particle size 9 μm). Lubricant R indicates Shamrock SST-2 (Shamrock Technology Co., fluororesin particles, average particle size 12.5 μm). Lubricant S indicates Celite dust 3620 (Hoechst, polyethylene wax, average particle size 8.5 μm).

2. Evaluation As described above, the physical properties of the light shielding member for optical equipment obtained in each experimental example were evaluated by the following methods. The results are shown in Table 3.

(1) Evaluation of light shielding property The optical density of the light shielding member for optical equipment obtained in each experimental example was measured using an optical densitometer (TD-904: Gretag Macbeth) based on JIS-K7651: 1988. A value exceeding 0.0 and a density in the non-measurable region was indicated as “◯”, and a value of 4.0 or less was indicated as “X”. Note that a UV filter was used for the measurement.

(2) Evaluation of slidability The static friction coefficient (μs) and the dynamic friction coefficient (μk) of the light-shielding member for optical equipment obtained in each experimental example are calculated based on JIS-K7125: 1999, load 200 (g), speed 100 ( mm / min). Those with a static friction coefficient (μs) of less than 0.30 were marked with “◎”, those with 0.30 or more and 0.35 or less “◯”, and those with 0.35 or more “x”. In addition, those having a dynamic friction coefficient (μk) of 0.30 or less were designated as “◯”, and those having a coefficient of 0.30 or more as “x”.

(3) Evaluation of matte property The glossiness (mirror glossiness) (%) of the light-shielding film surface of the light-shielding member for optical equipment obtained in each experimental example was measured based on JIS-Z8741: 1997. It is recognized that the lower the glossiness, the better the matte properties.

(4) Evaluation of conductivity The surface resistivity (Ω) of the light shielding member for optical equipment obtained in each experimental example was measured based on JIS K6911: 1995. A surface resistivity of less than 1.0 × 10 ⁵ Ω is “◯”, a surface resistivity of 1.0 × 10 ⁵ Ω or more and less than 1.0 × 10 ⁸ Ω is “Δ”, and 1.0 × 10 ⁸ Ω or more. The thing was made into "x".

(5) Evaluation of adhesiveness The adhesiveness of the light shielding member for optical equipment obtained in each experimental example was measured and evaluated based on the cross-cut tape method in JIS-K5400: 1990. 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 “◯”.

  In addition, it replaced with a polyimide film, and when the polyester film (Lumirror: Toray Industries, Inc.) was used for the base material, it evaluated also about the adhesiveness of the light shielding member for optical devices obtained in each experiment example, and any sample Also, the surface performance of the cross section was less than 5% (evaluation was “◯”), and the adhesiveness was good.

(6) Evaluation of abrasion resistance test About the light-shielding layer surface of the light-shielding member for optical equipment obtained in each experimental example, using a wear tester (NUS-ISO-1), sample pieces on the movable part and the fixed part A wear test was conducted under conditions of a load of 500 g and 100 reciprocations, and the glossiness (specular glossiness) of the surface of the sample piece placed on the fixed part before and after the wear test was measured, and the difference was evaluated. As a result, the value of “after abrasion test (glossiness) −before abrasion test (glossiness)” is less than 1.0, “◯”, and from 1.0 to less than 1.5, “△” Those of 1.5 or higher were rated as “x”.

(7) Evaluation of heat resistance The heat resistance of the light shielding member for optical equipment obtained in each experimental example was evaluated as follows. First, each light shielding member is heat-treated at 270 ° C. for 5 seconds. Next, the glossiness of the light-shielding film surface of each light-shielding member after the heat treatment is measured based on JIS-Z8741: 1997 as in the above (3). As a result, if the glossiness does not change before and after the heat treatment or the glossiness after the heat treatment is smaller than the glossiness before the heat treatment, it is judged as heat-resistant, and the glossiness after the heat treatment is gloss before the heat treatment. Those that became larger than the degree were judged as having no heat resistance, and “x” was assigned.

3. Discussion From Tables 2 and 3, the following can be understood. First, with respect to general physical properties (light shielding properties, slidability, matte properties, and conductivity) required for a light shielding film of a light shielding member for optical equipment, satisfactory results are obtained in all experimental examples.

  Next, the adhesiveness, abrasion resistance, and heat resistance of the light shielding film will be considered.

  In Experimental Example 8, the specific particulate lubricant used in Experimental Examples 1 to 7 was not used, and the content of the lubricant in the light shielding film was high (16.30% by weight). Is not sufficiently high (64.8% by weight). As a result, the light shielding film has poor adhesion and heat resistance. In addition, the weight ratio of the lubricant to the fine particles (lubricant / fine particles) in the light shielding film is increased (6.27), and there is a tendency that the adhesion and wear resistance of the light shielding film are lowered.

  On the other hand, in Experimental Examples 1-7, since a specific particulate lubricant is used, compared with Experimental Example 8, even if the content of the lubricant in the light-shielding film is lowered (In Experimental Example 6, 16.30 wt%, in Experiment Examples 1-7, 9.07 to 9.75 wt%), high slidability is obtained, and heat resistance and wear resistance are excellent. Further, as a relative effect of lowering the content of the lubricant in the light shielding film, the content of the binder resin can be increased (69.1% by weight or more), and as a result, the adhesion of the light shielding film is excellent. .

  As can be seen from the results of Experimental Example 4, if the content of the lubricant is lowered (9.07% by weight) than that of Experimental Examples 1 to 3, the content of fine particles (matting agent) must be increased. (9.10% by weight in Experimental Example 4, 4.50% by weight in Experimental Examples 1 to 3), and as a result, the weight ratio of lubricant to fine particles (lubricant / fine particles) in the light-shielding film becomes small (1 .00). For this reason, compared with the case of Experimental Examples 1-3, it exists in the tendency for the abrasion resistance of a light shielding film to fall, but even if it falls to this extent, it can be said that abrasion resistance is fully excellent.

  In Experimental Examples 5 and 6, the lubricant content was lower than in Experimental Examples 1 to 3, but the lubricant content was higher than in Experimental Example 4 (9.34% by weight, 9.35% by weight). %) And an increase in the content of fine particles (matting agent) are suppressed (6.66 wt%, 5.83 wt%). As a result, the weight ratio of the lubricant to the fine particles (lubricant / fine particles) in the light-shielding film is suppressed to be smaller than that of Experimental Example 4 (1.40, 1.60). Compared with the case, the tendency of the wear resistance of the light shielding film to decrease can be suppressed. As a relative effect by suppressing an increase in the content of the fine particles (matting agent) in the light shielding film, the content of the binder resin can be made higher than in the case of Experimental Example 4 (70.9 wt%, 71. As a result, the adhesion of the light shielding film was further improved.

  In Experimental Example 7, compared with Experimental Examples 1 to 3, the content of the lubricant was increased (9.75% by weight), and the content of the binder resin was increased (74.1% by weight). . As a result, the content of fine particles in the light-shielding film had to be reduced (2.40% by weight), but even in this case, a sufficient matte property was obtained (4.2%) and adhesion was achieved. It can be said that it has excellent properties, wear resistance and heat resistance.

  DESCRIPTION OF SYMBOLS 1 ... Light-shielding member for optical devices, 2 ... Base material, 3 ... Light-shielding film, 31 ... Binder resin and carbon black, 32 ... Lubricant, 33 ... Fine particle

Claims (8)

A light-shielding member for optical equipment with high heat resistance , comprising a film substrate and a light-shielding film formed on at least one surface of the substrate,
The film substrate is a polyimide film;
The light shielding film contains a thermosetting resin as a binder resin, carbon black, fluororesin particles, and fine particles,
The content of the binder resin and the fluororesin particles is 65% by weight or more and 5 to 15% by weight, respectively.
A light-shielding member for optical equipment, wherein a weight ratio of the fluororesin particles to the fine particles is 5 or less in terms of fluororesin particles / fine particles.   The light shielding member for optical equipment according to claim 1, wherein the content of the fluororesin particles is 10% by weight or less.   3. The light shielding member for optical equipment according to claim 1, wherein a weight ratio of the fluororesin particles to the fine particles is 3 or less in terms of fluororesin particles / fine particles.   4. The light shielding member for optical equipment according to claim 1, wherein the fluororesin particles have an average particle diameter of 5 to 10 μm.   5. The optical device according to claim 1, wherein the carbon black content and the fine particle content are 5 to 20 wt% and 1 to 10 wt%, respectively. Shading member for use. In the light-shielding member for optical devices according to any one of claims 1 to 5, wherein the fine particles, the light-shielding member for optical devices oil absorption is characterized in that it is 250 (g / 100g) or more. The light-shielding member for an optical device according to any one of claims 1 to 6, which has heat resistance capable of withstanding heating at 270 ° C. The light-shielding member for an optical device according to any one of claims 1 to 7, wherein the light-shielding member for an optical device is used by being incorporated in an optical device on which a component is mounted by reflow soldering.

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