JPWO2008156006A1 - Light shielding member for optical equipment - Google Patents

Abstract

To further reduce the size and weight of high-performance single-lens reflex cameras, compact cameras, video cameras, and the like, a light-shielding member for optical equipment that has a strong waist while reducing the thickness of the light-shielding member is provided. The light shielding member 3 for an optical device includes a base material 1 including at least two plastic films 11 and an intermediate layer 12 including a curable resin provided between the at least two plastic films 11, and The light shielding film 2 is formed on at least one side.

Description

  The present invention relates to a light-shielding member for an optical device that is suitably used as a shutter and a diaphragm member of an optical device such as a high-performance single-lens reflex camera, a compact camera, a video camera, a mobile phone, and a projector.

  In recent years, due to demands for miniaturization and weight reduction of high-performance single-lens reflex cameras, compact cameras, video cameras, and the like, shutters and diaphragm members of optical devices made of metal materials are being replaced by plastic materials.

  As such a light shielding member made of a plastic material, a light shielding film and a light shielding member in which a base film is provided with a light shielding film containing carbon black, a lubricant, and fine particles are known (Patent Documents 1 and 2).

JP-A-9-274218 (Claims) WO2006 / 016555 (background art)

  However, in order to further reduce the size and weight of high-performance single-lens reflex cameras, compact cameras, video cameras, etc., it is required to make the light shielding member thinner. When the film is made thinner, the light shielding member itself becomes weak and cannot be used as a shutter or a diaphragm member.

  Accordingly, an object of the present invention is to provide a light-shielding member for an optical device that has a thin thickness while being thin.

  In order to solve the above-described problems, the light shielding member for optical equipment according to the present invention is characterized in that a laminate of a plastic film and a resin layer containing a curable resin is used as a base material on which a light shielding film is formed.

In the light shielding member for optical equipment of the present invention, preferably, the base material is made of at least two plastic films, and the resin layer is an intermediate layer provided between the at least two plastic films.
In the light shielding member for optical equipment of the present invention, preferably, the resin layer has a thickness of 1 to 20 μm, the plastic film has a thickness of 4 to 50 μm, and the base material has a thickness of 60 μm or less.
In the light shielding member for optical equipment of the present invention, the resin layer preferably contains 50% by weight or more of curable resin, and the pencil hardness is H or more.

  According to the present invention, as a base material on which a light shielding film is formed, by using a laminate of a plastic film and a resin layer containing a curable resin, the waist of the light shielding member can be adjusted by the intermediate layer. Even if the thickness of the substrate is reduced, a light-shielding member for an optical device that maintains the waist required as a light-shielding member can be obtained. In particular, by using a base material in which an intermediate layer is provided between at least two plastic films, the impact is reduced as compared with a single film having the same thickness, so that the punching suitability is improved. Such a light shielding member 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.

  Hereinafter, an embodiment of a light shielding member for an optical device of the present invention (hereinafter sometimes referred to as “light shielding member”) will be described.

  The light shielding member of the present invention basically comprises a substrate and a light shielding film, and the substrate comprises a laminate of a plastic film and a resin layer made of a cured resin. The laminated body of a plastic film and a resin layer can have various configurations. For example, 1) a resin layer is provided on one or both sides of one plastic film, 2) a resin layer is provided as an intermediate layer between two plastic films, and 3) the laminate of 1) and / or 2) above. It is possible to take a configuration such as further laminating. Specifically, there is a configuration in which an intermediate layer is sandwiched between two plastic films, and another plastic film is bonded with an intermediate layer or an adhesive layer. Among these, it is preferable to provide a layer made of a cured resin as an intermediate layer between at least two plastic films from the viewpoint of adhesion to the light shielding film.

  1 and 2 show an example of a light shielding member 3 in which a light shielding film 2 is formed on both surfaces of a base material 1 in which an intermediate layer 12 is provided between two plastic films 11 and 11. In FIG. 2, 13 is an adhesive layer.

Hereinafter, each component of the light shielding member will be described in detail.
Synthetic materials such as polyester, ABS (acrylonitrile-butadiene-styrene), polystyrene, polycarbonate, acrylic, polyolefin, cellulose resin, polysulfone, polyphenylene sulfide, polyethersulfone, polyetheretherketone, polyimide, etc. A resin film can be used. Among them, a polyester film is preferably used, and a stretched polyester film, particularly a biaxially stretched polyester film, is particularly preferable because it is excellent in mechanical strength and dimensional stability and is firm. The thickness of such a plastic film is preferably 4 to 50 μm, and more preferably 4 to 20 μm from the viewpoint of reducing the thickness.

The plastic film may be a transparent resin film, a foamed polyester film, a synthetic resin film containing a black pigment such as carbon black, or other pigments. In this case, the above-mentioned plastic film 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 part 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.
When two or more plastic films are used, the same type may be used, or different types may be combined.

The layer containing the curable resin laminated on the plastic film or the intermediate layer containing the curable resin provided between the two plastic films is composed of a thermosetting resin and / or an ionizing radiation curable resin. It is. Hereinafter, the intermediate layer will be described regardless of the position where the layer containing the curable resin is provided.
Thermosetting resins and / or ionizing radiation curable resins include polyester resins, acrylic resins, acrylic urethane resins, urethane resins, epoxy resins, polycarbonate resins, melamine resins, phenol resins, and silicone resins. Resins that can form a cured film by heat or ionizing radiation, such as acrylate resins such as resins, polyester acrylate resins, polyurethane acrylate resins, and epoxy acrylate resins can be used, and room temperature curable resins can also be used. it can. Among them, it is preferable to use an ionizing radiation curable resin having excellent hardness because it can strengthen the waist when used as a light shielding member. Moreover, these 1 type (s) or 2 or more types can also be mixed and used.

  Such an intermediate layer has a function of adjusting the waist of the light shielding member. In the present invention, the intermediate layer contains a curable resin, but it is also possible to mix a relatively flexible resin so that the intermediate layer is not hardened and the flexibility of the light shielding member is not impaired. It is. As the resin for imparting such flexibility, a thermoplastic resin can be used, and a resin having a low glass transition temperature or a resin having a long polymer main chain can be used. In order to obtain a necessary waist even when a flexible resin is included, the curable resin is preferably 50% by weight or more and 70% by weight or more based on the total resin components. Further, an intermediate layer having a pencil hardness (JIS K5600-5-4: 1999) of at least H, more preferably at least 2H when cured is preferable.

  1-20 micrometers is preferable, as for the thickness of an intermediate | middle layer, it is more preferable that it is 2-10 micrometers, and it is further more preferable that it is 4-8 micrometers. The thickness of the light shielding member can be strengthened by setting it to 1 μm or more. By setting it to 20 μm or less, the end of the intermediate layer may be cracked or the interface between the intermediate layer and the plastic film may be peeled off during die cutting. Therefore, the light shielding member can be made thinner.

  When an intermediate layer is provided between at least two plastic films and used as a base material, as shown in FIG. 1, the intermediate layer 12 is bonded only to the plastic film 11 without interposing an adhesive layer or the like. In addition, as shown in FIG. 2, the adhesive layer 13 may be provided between the plastic film 11 and the intermediate layer 12 and the plastic film 11 may be bonded together. For example, when an ionizing radiation curable resin is used as the intermediate layer, a thermosetting resin capable of performing a solvent evaporation step and a curing step separately (for example, a thermosetting resin using a block isocyanate as a curing agent) ), The curable resin applied to one plastic film may be bonded to the other plastic film before it is cured, followed by a curing process such as irradiation with ionizing radiation. Is possible. Moreover, while forming the layer of curable resin in one plastic film, an adhesive layer can be provided in the other plastic film, and both can be adhere | attached.

  Adhesives used for the adhesive layer include natural rubber, recycled rubber, chloroprene rubber, nitrile rubber, styrene / butadiene, epoxy, urethane, polyester, acrylic, and acrylate compounds. Examples thereof include pressure adhesives, hot melt adhesives, and ionizing radiation curable adhesives.

  The thickness of the adhesive layer is preferably 1 to 10 μm, and more preferably 2 to 5 μm. By setting the thickness to 1 μm or more, it is possible to prevent the end portion of the adhesive layer from cracking at the time of die-cutting or to peel off the interface between the adhesive layer and the plastic film. By setting the thickness to 10 μm or less, the influence of the adhesive layer The light shielding member can be strengthened without receiving light, and the light shielding member can be thinned.

  The thickness of the entire substrate composed of the plastic film and the intermediate layer is preferably 9 to 100 μm, particularly preferably 9 to 60 μm from the viewpoint of thinning, and more preferably 9 to 25 μm. Furthermore, 10 micrometers or more are preferable among the ranges mentioned above from a viewpoint of mechanical strength. In the present invention, since a laminate of a plastic and a curable resin layer is used as a base material, it is possible to strengthen the waist, which is not sufficient with only a plastic film, and it is used as a shutter or diaphragm member that is used for a light shielding member. become able to. Further, by strengthening the waist, the shading member is not easily deflected when performing a punching process as a shutter or a diaphragm member, so that defects in the punching process can be reduced.

  In particular, when at least two plastic films are bonded to each other through the above-described intermediate layer to form a base material, the necessary waist can be obtained when used as a light-shielding member for optical equipment. There is no problem that occurs when a curable resin film is formed on a plastic film and the base material is curled.

  The light-shielding film is formed on at least one surface of the substrate made of the above-described laminate, and contains a binder resin, carbon black, and fine particles.

  Binder resins include poly (meth) acrylic acid resins, polyester resins, polyvinyl acetate resins, polyvinyl chloride resins, polyvinyl butyral resins, cellulose resins, polystyrene / polybutadiene resins, polyurethane resins, alkyd resins. , Acrylic resins, unsaturated polyester resins, epoxy ester resins, epoxy resins, epoxy acrylate resins, urethane acrylate resins, polyester acrylate resins, polyether acrylate resins, phenol resins, melamine resins, urea Thermoplastic resins such as resin and diallyl phthalate resin or thermosetting resins can be used, and one or more of these can be used in combination.

  The content of the binder resin is preferably 50 to 80% by weight in the light shielding film, and more preferably 55 to 75% by weight. By setting the binder resin to 50% by weight or more, it is possible to prevent the adhesiveness between the base material and the light-shielding film from being lowered. By setting the binder resin to 80% by weight or less, the light-shielding property, slidability, and matte are reduced. It is possible to prevent the physical properties of the light-shielding film such as the property from being deteriorated.

  Carbon black has a role for coloring the light-shielding film black to impart light-shielding properties, and to impart electrical conductivity and prevent charging due to static electricity. The average particle size of such carbon black is preferably 1 μm or less, and more preferably 0.5 μm or less in order to obtain sufficient light shielding properties.

  The content of carbon black is preferably 5 to 20% by weight, more preferably 10 to 20% by weight in the light shielding film. By setting the carbon black to 5% by weight or more, light shielding properties and conductivity can be imparted, and by setting the carbon black to 20% by weight or less, it is possible to prevent a decrease in adhesiveness, scratch resistance and coating strength. In addition, it is possible to prevent the cost from increasing.

  The fine particles contained in the light-shielding film reduce the reflection of light incident on the surface of the light-shielding member by forming fine irregularities on the surface, thereby reducing the glossiness (mirror glossiness) of the surface and making it a light-shielding member It is for improving the matte property of the.

  As such fine particles, any organic type such as crosslinked acrylic beads, inorganic type such as silica, magnesium aluminate metasilicate, and titanium oxide can be used, and among them, the inorganic type has a high matte effect. In particular, silica is preferably used from the viewpoints of fine particle dispersibility and low cost. Moreover, these 1 type (s) or 2 or more types can also be mixed and used.

  The average particle diameter of the fine particles is preferably 1 to 10 μm, and more preferably 1 to 6 μm. By setting it as such a range, it is because a fine unevenness | corrugation is formed in the surface of a light shielding member, and matte property is acquired.

  The content of fine particles is preferably 1 to 10% by weight in the light shielding film, and more preferably 1 to 5% by weight. By making the fine particles 1% by weight or more, it is possible to prevent the surface glossiness (mirror glossiness) from increasing and the matting property from being lowered, and by making the fine particles 10% by weight or less, It is possible to prevent the fine particles from falling off due to the sliding or the sliding property from being lowered.

  The light shielding film preferably contains a lubricant in addition to the binder resin, carbon black and fine particles. By containing a lubricant, the slidability of the surface of the light shielding member can be improved, and when processed into a shutter or a diaphragm member, the frictional resistance during operation can be reduced and the scratch resistance of the surface can be improved. . As such a material, any organic or inorganic material can be used as long as it is solid. For example, hydrocarbon lubricants such as polyethylene wax and paraffin wax, stearic acid, and 12-hydroxystearic acid. Fatty acid lubricants, amide lubricants such as oleic acid amide, erucic acid amide, ester lubricants such as stearic acid monoglyceride, alcohol lubricants, metal lubricants, talc, solid lubricants such as molybdenum disulfide, silicone resin particles, Fluorine resin particles such as polytetrafluoroethylene wax, cross-linked polymethyl methacrylate particles, cross-linked polystyrene particles and the like can be mentioned, and organic type particles are particularly preferably used. Moreover, these 1 type (s) or 2 or more types can also be mixed and used.

  Such a lubricant is preferably in the form of particles, and the average particle size is preferably 3 to 20 μm, and more preferably 5 to 10 μm. The reason for this range is that appropriate irregularities are formed on the surface and slidability is obtained.

  The content of the lubricant is preferably 5 to 20% by weight in the light shielding film, and more preferably 10 to 20% by weight. By setting the lubricant to 5% by weight or more, appropriate irregularities can be formed on the surface and slidability can be obtained, and by setting it to 20% by weight or less, the relative content of carbon black can be increased. Further, it is possible to prevent the light shielding property and the conductivity from being lowered.

  If the light-shielding film of the present invention does not impair the functions of the present invention, flame retardants, antibacterial agents, fungicides, antioxidants, plasticizers, leveling agents, flow regulators, antifoaming agents, dispersants, etc. Various additives can be contained.

  The thickness of the light shielding film is preferably 5 to 30 μm, and more preferably 5 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, thereby reducing the light-shielding property, and a sufficient light-shielding property can be obtained. Moreover, by setting it as 30 micrometers or less, it can prevent that a crack generate | occur | produces in a light shielding film and light-shielding property falls, or that a light shielding film falls off from a base material.

  The intermediate layer and the light shielding film constituting such a light shielding member can be formed by applying a coating solution obtained by dissolving a resin or the like in an appropriate solvent by a known coating method, followed by drying and curing.

  Further, in order to improve the adhesion between the plastic film and the intermediate layer or the light shielding film, anchor treatment or corona treatment can be performed as necessary.

  As described above, the light shielding member for optical equipment according to the present invention uses a laminate of a layer including a plastic film and a curable resin as a base material for forming a light shielding film. Therefore, it can be suitably used as a shutter and a diaphragm member for optical devices such as high-performance single-lens reflex cameras, compact cameras, video cameras, mobile phones, and projectors.

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

[Example 1]
Apply and dry the following intermediate layer coating solution on one side of a 6 μm thick polyester film (K200: Mitsubishi Chemical Polyester) to form a 5 μm thick intermediate layer, and paste the 6 μm thick polyester film on the intermediate layer surface. A substrate having a thickness of 17 μm was produced by irradiating with ultraviolet rays. The pencil hardness (JIS K5600-5-4: 1999) of the intermediate layer was 2H.

<Coating liquid for intermediate layer>
・ Ionizing radiation curable resin 5 parts (Beamset 575: Arakawa Chemical Industries)
・ Diluted solvent 20 parts

  Next, the following coating solution for light shielding film was applied to both surfaces of the produced base material and dried to form a light shielding film having a thickness of 10 μm. Thus, a light shielding member for optical equipment of Example 1 was produced.

<Coating solution for light shielding film>
・ 92 parts of acrylic polyol (Acridic A804: Dainippon Ink and Chemicals, solid content: 50%)
・ Isocyanate 25 parts (Bernock DN980: Dainippon Ink and Chemicals, solid content: 75%)
・ Carbon black 16.3 parts (Vulcan XC-72: Cabot)
Fine particles 2.6 parts (silica TS100: Degussa, average particle size 4 μm)
・ Lubricant 16.3 parts (Seridust 3620: Hoechst, average particle size 8.5 μm)
・ Dilute solvent 100 parts

[Example 2]
The following intermediate layer coating solution is applied to one side of a 6 μm thick polyester film (K200: Mitsubishi Chemical Polyester) and dried to form a 5 μm thick intermediate layer, and the following adhesive layer coating solution is applied to the intermediate layer surface. It was applied and dried to a thickness of 1 μm. Next, a 6 μm thick polyester film was bonded to the adhesive layer surface to prepare a 18 μm thick base material. Subsequently, the same light shielding film as Example 1 was formed on both surfaces of the produced base material, and the light shielding member for optical devices of Example 2 was produced. The pencil hardness (JIS K5600-5-4: 1999) of the intermediate layer was H.

<Coating liquid for intermediate layer>
・ 10 parts of thermosetting resin (Acridic A817: Dainippon Ink & Chemicals, solid content: 50%)
・ Isocyanate 2.4 parts (Takenate D110N: Dainippon Ink & Chemicals, solid content: 60%)
・ Dilute solvent 14.3 parts

<Coating liquid for adhesive layer>
・ 7.5 parts of fully etherified melamine (Nikarak MW-30M: Sanwa Chemical Co., Ltd.)
-Polyester resin 50.0 parts (Byron 55SS: Toyobo Co., Ltd., solid content 35%)
・ Diluted solvent 42.5 parts

[Example 3]
A light shielding member for optical equipment of Example 3 was produced in the same manner as in Example 1 except that the thickness of the intermediate layer was 10 μm.

[Comparative Example 1]
The base material was changed to a polyester film having a thickness of 12 μm (H100: Mitsubishi Chemical Polyester Co., Ltd.), the same light-shielding film as in Example 1 was formed on both surfaces of the base material, and a light-shielding member for optical equipment of Comparative Example 1 was produced. .

[Comparative Example 2]
The following intermediate layer coating solution was applied and dried on one surface of a 6 μm thick polyester film (K200: Mitsubishi Chemical Polyester) to form an intermediate layer having a thickness of 1 μm. Next, a 12 μm thick polyester film (H100: Mitsubishi Chemical Polyester) was bonded to the intermediate layer surface to produce a 19 μm thick base material. Subsequently, the same light shielding film as Example 1 was formed on both surfaces of the produced base material, and the light shielding member for optical devices of Comparative Example 2 was produced. The pencil hardness (JIS K5600-5-4: 1999) of the intermediate layer was 3B.

<Coating liquid for intermediate layer>
-Polyester resin 50.0 parts (Byron 55SS: Toyobo Co., Ltd., solid content 35%)
・ Dilution solvent 50.0 parts

[Comparative Example 3]
The base material was changed to a polyester film having a thickness of 25 μm (T100: Mitsubishi Chemical Polyester Co., Ltd.), the same light-shielding film as in Example 1 was formed on both surfaces of the base material, and a light-shielding member for optical equipment of Comparative Example 3 was produced. .

表に示す結果からも明らかなように、実施例１、２の光学機器用遮光部材は、中間層として硬化型樹脂層が設けられているため、比較例３の光学機器用遮光部材と比較して、薄いものであるが同等の腰があり、加工時の作業性に優れるものであった。また実施例３の光学機器用遮光部材は、厚みは比較例３の光学機器用遮光部材より若干薄い程度であるが、腰の強さは比較例３よりも優れていた。また実施例１及び３の光学機器用遮光部材は、硬化型樹脂として電離放射線硬化型樹脂を用いているため接着層を必要とせず、薄型で十分な腰を得られるものであった。さらに、中間層が２枚のプラスチックフィルムで挟まれているため、平面性も良好であった。また、実施例１〜３の光学機器用遮光部材は、適度な腰があるため、不要な接触部分がなくシャッターや絞り部材として摺動性に優れるものであった。The waist strength of the light shielding members of Examples and Comparative Examples was evaluated by the following method.
As shown in FIG. 3, a sample piece S having a length of 12.5 cm and a width of 2.5 cm is prepared, and a part thereof (a part having a length of 1 cm and a width of 2.5 cm) is fixed to the table T. The remaining portion was placed so as to hang down, and the distance D between the perpendicular L dropped from the end of the stage T on which the sample piece was fixed and the end of the hanged sample piece was measured. The distance D is less than 1 cm, x is 1 cm or more and less than 3 cm, and ◯ is 3 cm or more. The results are shown in Table 1.

As is clear from the results shown in the table, the light shielding members for optical devices of Examples 1 and 2 are provided with a curable resin layer as an intermediate layer, so that they are compared with the light shielding members for optical devices of Comparative Example 3. Although it was thin, it had the same waist and was excellent in workability during processing. Further, the light shielding member for optical equipment of Example 3 was slightly thinner than the light shielding member for optical equipment of Comparative Example 3, but the waist strength was superior to that of Comparative Example 3. Moreover, since the light shielding member for optical devices of Examples 1 and 3 uses an ionizing radiation curable resin as the curable resin, it does not require an adhesive layer, and is thin and has sufficient waist. Furthermore, since the intermediate layer was sandwiched between two plastic films, the flatness was good. Moreover, since the light shielding member for optical devices of Examples 1 to 3 has an appropriate waist, there is no unnecessary contact portion, and it has excellent slidability as a shutter or a diaphragm member.

  On the other hand, the light shielding member for optical equipment of Comparative Example 1 has no waist and is inferior in workability at the time of processing, and has many contact portions and inferior in slidability when used as a shutter or a diaphragm member.

  The light shielding member for optical equipment of Comparative Example 2 does not use a curable resin as an intermediate layer. Although it is thicker than the light-shielding member for optical devices of Examples 1 and 2, it has no waist and is inferior in workability at the time of processing. It was inferior to.

  Since the light-shielding member for optical equipment of Comparative Example 3 uses a film having a thickness of 25 μm as a base material, the thickness is the same as that of Examples 1 and 2, but the thickness is the same as that of Examples 1 and 2. It was not suitable for thick and thin applications compared to the light shielding member for equipment.

Sectional drawing which shows one Example of the light-shielding member for optical devices of this invention. Sectional drawing which shows the other Example of the light-shielding member for optical devices of this invention. The figure explaining the evaluation method of the light-shielding member for optical devices of an Example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base material 11 ... Plastic film 12 ... Intermediate layer 13 ... Adhesive layer 2 ... Light shielding film 3 ... Light shielding member for optical equipment

Claims (5)

A light-shielding member for an optical device comprising a base material and a light-shielding film formed on at least one side of the base material,
The said base material is a laminated body of the plastic film and the resin layer containing curable resin, The light-shielding member for optical devices characterized by the above-mentioned. The light-shielding member for optical equipment according to claim 1,
The substrate is made of at least two plastic films, and the resin layer is an intermediate layer provided between the at least two plastic films. The light-shielding member for optical equipment according to claim 1,
A light-shielding member for an optical device, wherein the resin layer has a thickness of 1 to 20 μm, the plastic film has a thickness of 4 to 50 μm, and the base material has a thickness of 60 μm or less. The light-shielding member for optical equipment according to claim 1,
The light shielding member for an optical device, wherein the resin layer contains 50% by weight or more of a curable resin and has a pencil hardness of H or more.   A base material composed of at least two plastic films and an intermediate layer containing a curable resin provided between the at least two plastic films, and a light-shielding film formed on at least one side of the base material. A light-shielding member for optical equipment.

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