JP5655387B2 - Optical components - Google Patents
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- JP5655387B2 JP5655387B2 JP2010135813A JP2010135813A JP5655387B2 JP 5655387 B2 JP5655387 B2 JP 5655387B2 JP 2010135813 A JP2010135813 A JP 2010135813A JP 2010135813 A JP2010135813 A JP 2010135813A JP 5655387 B2 JP5655387 B2 JP 5655387B2
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- 230000003287 optical effect Effects 0.000 title claims description 39
- 239000010419 fine particle Substances 0.000 claims description 73
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Description
本発明は、反射防止を行う塗料により塗装された光学部品、例えば、カメラなどの光学機器に接続されるレンズ鏡筒ユニットを構成するレンズ鏡筒に関するものである。 The present invention is more painted optical components paint performing antireflection, for example, to a lens barrel of the lens barrel unit connected to the optical instrument such as a camera.
この種のレンズ鏡筒ユニットは、レンズなどの光学素子と、この光学素子を内部に収容するレンズ鏡筒と、光量を調節する絞り部品と、光学素子を移動させて所望の焦点距離を確保するための移動部材と、レンズ鏡筒をカメラなどの光学機器に固定する固定部材とから構成されている。 This type of lens barrel unit secures a desired focal length by moving an optical element such as a lens, a lens barrel that houses the optical element, a diaphragm part that adjusts the amount of light, and the optical element. And a fixing member for fixing the lens barrel to an optical device such as a camera.
このうち、レンズ鏡筒の内壁面は、何らかの反射防止策を施して反射防止面とする必要がある。これは、光学素子を透過してレンズ鏡筒の内部に入射する光のうち、被写体像の形成に寄与しない軸外光がレンズ鏡筒の内壁面で反射した結果、この反射光がレンズ鏡筒の内部で迷光となって撮像素子に到達し、所謂フレアやゴーストなどの不具合を発生させ、画像品質を低下させるという問題に対処するためである。 Among these, the inner wall surface of the lens barrel needs to be subjected to some antireflection measures to be an antireflection surface. This is because off-axis light that does not contribute to the formation of the subject image out of the light that passes through the optical element and enters the lens barrel is reflected by the inner wall surface of the lens barrel. This is to cope with the problem that stray light reaches the image sensor inside the image sensor, causes problems such as so-called flare and ghost, and degrades the image quality.
このような反射防止策の手法としては、従来、レンズ鏡筒の内壁面に対して、光の反射角度を考慮した段差や傾斜（Ｖ溝）を形成したり、梨地加工を施したりする機械加工方法があった。ところが、レンズ鏡筒の内部への入射光は、レンズ鏡筒の内部の部材によって複雑な方向へ反射するため、このような機械加工方法では、反射を十分に低減することが困難であった。 Conventionally, as a method of such an anti-reflection measure, a machining process in which a step or inclination (V-groove) in consideration of a light reflection angle is formed on the inner wall surface of the lens barrel or a satin finish is applied. There was a way. However, since the incident light to the inside of the lens barrel is reflected in a complicated direction by the members inside the lens barrel, it is difficult to sufficiently reduce the reflection by such a machining method.
また、反射防止策の別の手法として、レンズ鏡筒の内壁面に黒色塗料や艶消し塗料を塗布して光吸収・散乱部材とし、レンズ鏡筒の内壁面の光沢度を低下させるという科学的皮膜形成方法が提案されている（例えば、特許文献１〜３参照）。 Another method for preventing reflection is to apply a black paint or matte paint to the inner wall surface of the lens barrel to make a light absorbing / scattering member, which reduces the glossiness of the inner wall surface of the lens barrel. A film forming method has been proposed (see, for example, Patent Documents 1 to 3).
しかしながら、特許文献１〜３に開示された科学的皮膜形成方法を用いたとしても、鏡筒内周面に到達した軸外光の正反射光が減るのみであり、鏡筒内周面からの拡散光をも含めた反射光全体はほとんど減少しない。そのため、レンズ鏡筒の内壁面の明度指数はほとんど低下しない。また、この正反射光も、内壁面の光沢度（入射角６０°、受光角６０°における光沢度）を十分なレベル（０．１以下）にまで下げることはできない。したがって、軸外光がレンズ鏡筒の内部で迷光となって撮像素子に到達してしまう恐れが依然として残るため、所謂フレアやゴーストなどの不具合が発生して画像品質の低下につながるという問題は、ほとんど改善されないままである。 However, even if the scientific film forming methods disclosed in Patent Documents 1 to 3 are used, only the off-axis regular reflection light reaching the lens barrel inner peripheral surface is reduced. The total reflected light including diffused light hardly decreases. Therefore, the brightness index of the inner wall surface of the lens barrel hardly decreases. Also, this regular reflection light cannot lower the glossiness of the inner wall surface (glossiness at an incident angle of 60 ° and a light receiving angle of 60 °) to a sufficient level (0.1 or less). Therefore, there is still a possibility that off-axis light may become stray light inside the lens barrel and reach the image sensor, so that problems such as so-called flare and ghosts occur and lead to deterioration in image quality. Little remains improved.
すなわち、特許文献１に開示された技術は、光沢度低下を目的に使用されるつや消し剤およびそれを用いた塗料組成物に関するものであり、天然高分子であるセルロース粉末を塗料に配合している。その効果は、従来から使用されている粉末シリカと同程度の光沢度１．５（表１の実施例３）を達成できるに過ぎない。これに対して、レンズ鏡筒のような光学部品で必要とされる光沢度は０．１以下と桁違いに小さいため、特許文献１に開示された技術では、所謂フレアやゴーストなどの不具合の発生を抑えて画像品質を向上させることは期待できない。 That is, the technique disclosed in Patent Document 1 relates to a matting agent used for the purpose of reducing glossiness and a coating composition using the same, and blends cellulose powder, which is a natural polymer, into the coating. . The effect can only achieve a gloss level of 1.5 (Example 3 in Table 1) comparable to that of powdered silica used conventionally. On the other hand, the glossiness required for an optical component such as a lens barrel is an order of magnitude less than 0.1. Therefore, the technique disclosed in Patent Document 1 has problems such as so-called flare and ghost. It cannot be expected to improve the image quality by suppressing the occurrence.
また、特許文献２は、微粒子を分散した電着塗料を用いて形成された電着塗装膜に関するものである。ところが、特に微粒子については、第１に、形状は１種類の形状からなっていても複数の種類の形状からなっていてもかまわず、第２に着色については何ら言及されていない。しかも、こうした電着塗装では、微粒子が塗膜に埋もれてしまい、塗膜の表面から突出した状態とはならない。したがって、特許文献２に開示された技術では、所謂フレアやゴーストなどの不具合の発生を抑えて画像品質を向上させることは不可能である。 Patent Document 2 relates to an electrodeposition coating film formed using an electrodeposition paint in which fine particles are dispersed. However, particularly for fine particles, first, the shape may be one type or a plurality of types, and secondly, there is no mention of coloring. In addition, in such electrodeposition coating, the fine particles are buried in the coating film and do not protrude from the surface of the coating film. Therefore, with the technique disclosed in Patent Document 2, it is impossible to improve image quality by suppressing the occurrence of problems such as so-called flare and ghost.
また、特許文献３は、投射型テレビジョン受信機のレンズ鏡筒の内部の反射防止に関するものであり、レンズ鏡筒の内壁面に、このレンズ鏡筒の屈折率よりも低いフッ素系化合物薄膜を形成することにより、反射防止効果を狙うものである。ところが、この方法では、数％の反射率の低下は見られるものの、レンズ鏡筒のような光学部品で必要とされるレベル、つまり６０°における光沢度０．１以下までは低下させることができない。ここで、光沢度の定義は、屈折率１．５６７のガラス鏡面研磨面に対する反射率を光沢度１００としており、このガラス鏡面の実際の反射率は、６０°入射の場合１０．０１％である。したがって、６０°における光沢度０．１は０．０１％となり、ほとんど無反射に近いものである。そのため、反射防止のみで６０°における光沢度を０．１以下にすることは不可能に近く、６０°における光沢度を０．１以下にするためには、表面拡散させるための表面凹凸が必要となる。以上のことから、特許文献３に開示された技術は、所謂フレアやゴーストなどの不具合の発生を抑えて画像品質を向上させることができるものではない。 Patent Document 3 relates to antireflection inside a lens barrel of a projection television receiver, and a fluorine-based compound thin film lower than the refractive index of the lens barrel is provided on the inner wall surface of the lens barrel. By forming, it aims at the antireflection effect. However, in this method, although the reflectance is reduced by several percent, it cannot be reduced to a level required for an optical component such as a lens barrel, that is, a glossiness of 0.1 or less at 60 °. . Here, the definition of the glossiness is that the reflectivity with respect to the glass mirror polished surface having a refractive index of 1.567 is 100 glossiness, and the actual reflectivity of this glass mirror surface is 10.01% at 60 ° incidence. . Accordingly, the glossiness of 0.1 at 60 ° is 0.01%, which is almost non-reflective. For this reason, it is almost impossible to reduce the glossiness at 60 ° to 0.1 or less simply by preventing reflection, and in order to reduce the glossiness at 60 ° to 0.1 or less, surface irregularities are necessary for surface diffusion. It becomes. From the above, the technique disclosed in Patent Document 3 cannot improve the image quality by suppressing the occurrence of problems such as so-called flare and ghost.
本発明は、このような事情に鑑み、塗装された部品の反射散乱光を少なくする塗料を用いることにより、所謂フレアやゴーストなどの不具合の発生を抑制し、画像コントラストを向上させて画像品質を向上させることが可能な光学部品を提供することを目的とする。 In view of such circumstances, the present invention suppresses the occurrence of defects such as so-called flare and ghost by using a paint that reduces the reflected and scattered light of painted parts, and improves image contrast and improves image quality. and to provide an optical unit products capable of improving.
本発明に係る第１の光学部品は、光学素子（３、４）を内部に収容する本体（２１）を有する光学部品（２）であって、前記本体の内壁面（２１ａ）には、バインダー（７）によって当該内壁面に固着された高分子材料からなる複数の多孔質の微粒子（６）を含む黒色塗装膜（５）が形成され、前記各微粒子の屈折率は、前記バインダーの屈折率とほぼ同一であり、前記複数の微粒子は、粒子径が２０μｍ以上であり、少なくともその一部が前記バインダーの表面から突出する形で前記本体の内壁面のほぼ全面を覆っており、前記黒色塗装膜は、前記多孔質の微粒子と前記バインダーとを含む塗料を前記本体の内壁面に塗布して乾燥させることにより得られたものである光学部品としたことを特徴とする。 A first optical component according to the present invention is an optical component (2) having a main body (21) for accommodating an optical element (3, 4) therein, and an inner wall surface (21a) of the main body has a binder. A black coating film (5) including a plurality of porous fine particles (6) made of a polymer material fixed to the inner wall surface by (7) is formed, and the refractive index of each fine particle is the refractive index of the binder. The plurality of fine particles have a particle diameter of 20 μm or more, and at least part of the fine particles covers the entire inner wall surface of the main body so as to protrude from the surface of the binder. The film is an optical component obtained by applying a coating material containing the porous fine particles and the binder to the inner wall surface of the main body and drying it .
なお、ここでは、本発明をわかりやすく説明するため、実施の形態を表す図面の符号に対応づけて説明したが、本発明が実施の形態に限定されるものでないことは言及するまでもない。 Here, in order to explain the present invention in an easy-to-understand manner, the description has been made in association with the reference numerals of the drawings representing the embodiments, but it goes without saying that the present invention is not limited to the embodiments.
本発明によれば、本発明の塗料により塗装することにより、光学素子を内部に収容する本体の内壁面に入射する光の大部分を微粒子によって吸収して反射率を減少させ、この内壁面の光沢度および明度指数を低減することができる。そのため、所謂フレアやゴーストなどの不具合の発生を抑制し、画像コントラストを向上させて画像品質を向上させることが可能となる。 According to the present invention, by coating with the paint of the present invention, most of the light incident on the inner wall surface of the main body that houses the optical element is absorbed by the fine particles and the reflectance is reduced. Glossiness and lightness index can be reduced. Therefore, it is possible to suppress the occurrence of defects such as so-called flare and ghost, improve the image contrast, and improve the image quality.
以下、本発明の実施の形態について説明する。
［発明の実施の形態１］
Embodiments of the present invention will be described below.
Embodiment 1 of the Invention
図１および図２は、本発明の実施の形態１に係る図である。この実施の形態１では、光学部品としてレンズ鏡筒２を用い、本体として筒本体２１を用い、光学素子として前群レンズ群３および後群レンズ群４を用い、バインダーとして皮膜形成用樹脂７を用いている。 1 and 2 are diagrams according to Embodiment 1 of the present invention. In the first embodiment, the lens barrel 2 is used as an optical component, the cylinder main body 21 is used as a main body, the front group lens group 3 and the rear group lens group 4 are used as optical elements, and a film forming resin 7 is used as a binder. Used.
レンズ鏡筒ユニット１は、図１に示すように、ポリカーボネートからなる略円筒状のレンズ鏡筒２を有しており、レンズ鏡筒２は、円筒状の筒本体２１、円環状の第１レンズ保持部２２、円環状の第２レンズ保持部２３から構成されている。ここで、筒本体２１の内部には、一端部（図１左端部）の近傍に第１レンズ保持部２２が筒本体２１と一体に形成されているとともに、他端部（図１右端部）の近傍に第２レンズ保持部２３が筒本体２１と一体に形成されている。 As shown in FIG. 1, the lens barrel unit 1 has a substantially cylindrical lens barrel 2 made of polycarbonate. The lens barrel 2 includes a cylindrical barrel body 21 and an annular first lens. The holding unit 22 and the annular second lens holding unit 23 are configured. Here, in the inside of the cylinder main body 21, a first lens holding part 22 is formed integrally with the cylinder main body 21 in the vicinity of one end (left end in FIG. 1), and the other end (right end in FIG. 1). The second lens holding portion 23 is formed integrally with the cylinder main body 21 in the vicinity of.
また、レンズ鏡筒２には、図１に示すように、前群レンズ群３および後群レンズ群４がこれらの光軸を一致させた形で取り付けられている。すなわち、レンズ鏡筒２の第１レンズ保持部２２には、前群レンズ群３がその光軸を筒本体２１の中心に合致させた状態で嵌合している。また、レンズ鏡筒２の第２レンズ保持部２３には、後群レンズ群４がその光軸を筒本体２１の中心に合致させた状態で嵌合している。その結果、前群レンズ群３の光軸と後群レンズ群４の光軸とが一致した状態となっている。 Further, as shown in FIG. 1, a front lens group 3 and a rear lens group 4 are attached to the lens barrel 2 so that their optical axes coincide with each other. In other words, the front lens group 3 is fitted to the first lens holding portion 22 of the lens barrel 2 with its optical axis aligned with the center of the cylinder body 21. Further, the rear lens group 4 is fitted to the second lens holding portion 23 of the lens barrel 2 in a state where the optical axis thereof is matched with the center of the tube main body 21. As a result, the optical axis of the front lens group 3 and the optical axis of the rear lens group 4 are in agreement.
ところで、レンズ鏡筒２の筒本体２１の内壁面２１ａには、図２に示すように、その全面にわたって黒色塗装膜５が形成されている。この黒色塗装膜５は、多数の微粒子６を含む黒色の皮膜形成用樹脂７から構成されている。 Incidentally, as shown in FIG. 2, a black coating film 5 is formed on the entire inner wall surface 21a of the tube body 21 of the lens barrel 2 as shown in FIG. The black coating film 5 is composed of a black film forming resin 7 containing a large number of fine particles 6.
ここで、各微粒子６は、孔径０．０２〜０．２５μｍの範囲内の多数の細孔が表面に形成された球状（つまり、多孔質球状）のポリメタクリル酸メチル（ＰＭＭＡ、屈折率１．４９）から構成されている。これらの微粒子６は、図２に示すように、皮膜形成用樹脂７の表面から突出する形で筒本体２１の内壁面２１ａのほぼ全面を覆っており、その面密度（黒色塗装膜５の厚さ方向に垂直な平面に配置される微粒子６の単位面積当たりの個数）は、概ね２５０〜５０００個／ｍｍ2 の範囲内となっている。一方、皮膜形成用樹脂７はアクリルウレタン（屈折率およそ１．５）から構成されている。したがって、各微粒子６と皮膜形成用樹脂７とは、屈折率がほぼ同一となっている。 Here, each fine particle 6 has a spherical (that is, porous spherical) polymethyl methacrylate (PMMA, refractive index 1...) In which a large number of pores having a pore diameter in the range of 0.02 to 0.25 μm are formed on the surface. 49). As shown in FIG. 2, these fine particles 6 cover almost the entire inner wall surface 21a of the cylinder main body 21 so as to protrude from the surface of the film-forming resin 7, and the surface density (thickness of the black coating film 5) is covered. The number of fine particles 6 arranged in a plane perpendicular to the vertical direction per unit area) is generally in the range of 250 to 5000 / mm 2 . On the other hand, the film-forming resin 7 is made of acrylic urethane (refractive index of about 1.5). Therefore, each fine particle 6 and the film-forming resin 7 have substantially the same refractive index.
なお、こうした黒色塗装膜５を筒本体２１の内壁面２１ａに形成するには、種々の方法を採用することができる。例えば、皮膜形成用樹脂７となる塗料中に微粒子６を所定の割合で添加して分散させて黒色着色塗料を調製した後、この黒色着色塗料を筒本体２１の内壁面２１ａにスプレー塗装して乾燥させることにより、黒色塗装膜５を筒本体２１の内壁面２１ａに形成することもできる。このスプレー塗装も含めて一般に塗装の場合、微視的に見ると、一度塗りでは、筒本体２１の内壁面２１ａの全面に微粒子６が並ばない恐れがあるのに対して、二度塗りすると、１層目（下塗り）の微粒子６の隙間を埋める形で筒本体２１の内壁面２１ａの全面に微粒子６が並びやすい点で好ましい。 In order to form such a black coating film 5 on the inner wall surface 21a of the cylinder body 21, various methods can be employed. For example, after the fine particles 6 are added and dispersed at a predetermined ratio in the paint to be the film forming resin 7 to prepare a black colored paint, the black colored paint is spray-coated on the inner wall surface 21 a of the cylinder body 21. The black coating film 5 can also be formed on the inner wall surface 21a of the cylinder body 21 by drying. In general, in the case of painting including this spray coating, when viewed microscopically, fine particles 6 may not line up on the entire inner wall surface 21a of the cylinder main body 21 once applied, whereas when applied twice, This is preferable in that the fine particles 6 are easily arranged on the entire inner wall surface 21a of the cylinder main body 21 so as to fill a gap between the fine particles 6 of the first layer (undercoat).
このように、レンズ鏡筒ユニット１のレンズ鏡筒２においては、筒本体２１の内壁面２１ａに多数の多孔質球状の微粒子６が、筒本体２１の内壁面２１ａのほぼ全面を被覆するように所定の面密度で配置されている。そのため、被写体像の形成に寄与しない軸外光が前群レンズ群３や後群レンズ群４を透過してレンズ鏡筒２の内部に入り込んだ場合、筒本体２１の内壁面２１ａに入射した軸外光の大部分は、微粒子６の細孔内で反射を繰り返して吸収され、この細孔内に閉じ込められる。したがって、この軸外光は、その大部分が微粒子６によって吸収され、反射率が大幅に低下することから、レンズ鏡筒２の内部で迷光となって撮像素子（図示せず）に到達する事態がほとんど発生しなくなる。その結果、所謂フレアやゴーストなどの不具合の発生を抑制し、画像コントラストを向上させて画像品質を向上させることが可能となる。 As described above, in the lens barrel 2 of the lens barrel unit 1, the inner wall surface 21 a of the tube body 21 is covered with a large number of porous spherical fine particles 6 so as to cover almost the entire inner wall surface 21 a of the tube body 21. They are arranged with a predetermined surface density. Therefore, when off-axis light that does not contribute to the formation of the subject image passes through the front lens group 3 and the rear lens group 4 and enters the lens barrel 2, the axis incident on the inner wall surface 21 a of the cylinder body 21. Most of the external light is absorbed by being repeatedly reflected in the pores of the fine particles 6 and confined in the pores. Accordingly, most of the off-axis light is absorbed by the fine particles 6 and the reflectance is greatly reduced, so that the off-axis light reaches the image sensor (not shown) as stray light inside the lens barrel 2. Almost disappears. As a result, it is possible to suppress the occurrence of defects such as so-called flare and ghost, improve the image contrast, and improve the image quality.
しかも、これらの微粒子６は、皮膜形成用樹脂７の表面から突出しているので、筒本体２１の内壁面２１ａへの入射光を捕捉しやすくなり、上述した効果が顕著になる。 Moreover, since these fine particles 6 protrude from the surface of the film-forming resin 7, it becomes easy to capture incident light on the inner wall surface 21 a of the cylinder body 21, and the above-described effects become remarkable.
また、微粒子６の屈折率と皮膜形成用樹脂７の屈折率とがほぼ同一となっているため、微粒子６に光が入射したとき、微粒子６と皮膜形成用樹脂７との界面において、散乱光が減少して透過光が増大する。その結果、黒色塗装膜５は、黒味が強くなると同時に光沢度が低下する。 Further, since the refractive index of the fine particles 6 and the refractive index of the film-forming resin 7 are substantially the same, when light enters the fine particles 6, the scattered light is scattered at the interface between the fine particles 6 and the film-forming resin 7. Decreases and the transmitted light increases. As a result, the black paint film 5 has a strong black color and a reduced glossiness.
さらに、各微粒子６は、その材質がポリメタクリル酸メチルであり、シリカなどの低分子材料より屈折率が低いので、粒子表面での反射光が減って黒味が強くなる。 Further, each fine particle 6 is made of polymethyl methacrylate and has a refractive index lower than that of a low molecular material such as silica, so that the reflected light on the particle surface is reduced and the blackness becomes strong.
なお、このような微粒子６を含有する塗料の代表例としては、アクリルウレタンを主成分に、黒色顔料を含有させ、さらにそれをシンナーで希釈溶解した溶液に対して、質量百分率で１０％〜８０％の割合で、微粒子６を含有させたものを使用することができる。 In addition, as a typical example of the coating material containing such fine particles 6, the mass percentage is 10% to 80% with respect to a solution containing acrylic urethane as a main component, a black pigment, and further diluted and dissolved with thinner. % Containing fine particles 6 can be used.
ところで、微粒子６の混合割合が１０％未満であると、１回の塗布乾燥後で得られる黒色塗装膜５に捉えられた微粒子６の密度が少ないため、十分な黒味が発現できない。一方、微粒子６の混合割合が８０％より大きいと、塗布されたのちの黒色塗装膜５における微粒子６の密度が８０％を超えた時点で密度が増加しなくなる。そして、微粒子６の消費量だけが多くなるため、無駄に消費する微粒子６が多くなるだけである。
［発明のその他の実施の形態］
By the way, when the mixing ratio of the fine particles 6 is less than 10%, since the density of the fine particles 6 captured in the black coating film 5 obtained after one coating and drying is small, sufficient blackness cannot be expressed. On the other hand, if the mixing ratio of the fine particles 6 is greater than 80%, the density does not increase when the density of the fine particles 6 in the black coating film 5 after application exceeds 80%. And since only the consumption amount of the fine particles 6 is increased, only the fine particles 6 are wasted.
[Other Embodiments of the Invention]
なお、上述した実施の形態１では、微粒子６が多孔質球状である場合について説明した。しかし、微粒子６は、多孔質である限り、球状以外の形状（例えば、不定形など）とすることも可能である。微粒子６が不定形である場合、球状の場合に比べて、正反射光が減少するため、黒色塗装膜５の光沢度が低下する利点がある。 In the first embodiment described above, the case where the fine particles 6 are porous spheres has been described. However, the fine particles 6 may have a shape other than a spherical shape (for example, an irregular shape) as long as it is porous. When the fine particles 6 are indefinite, the specular reflection light is reduced as compared with a spherical shape, and thus there is an advantage that the glossiness of the black coating film 5 is lowered.
また、上述した実施の形態１では、ポリメタクリル酸メチルからなる微粒子６について説明した。しかし、微粒子６の材質としては、ポリメタクリル酸メチル以外の高分子材料（例えば、ポリアクリルニトリル（屈折率１．５２）などのポリアクリルニトリル系、ポリアクリレート系、ポリスチレン系など）を代用することもできる。これらの場合も、シリカなどの低分子材料より屈折率が低いので、ポリメタクリル酸メチルの場合と同様、粒子表面での反射光が減って黒味が強くなる傾向にある。 In the first embodiment described above, the fine particles 6 made of polymethyl methacrylate have been described. However, as the material of the fine particles 6, a polymer material other than polymethyl methacrylate (for example, polyacrylonitrile, polyacrylate, polystyrene, etc. such as polyacrylonitrile (refractive index 1.52)) is substituted. You can also. In these cases as well, since the refractive index is lower than that of low-molecular materials such as silica, the reflected light on the particle surface tends to decrease and the blackness tends to become strong, as in the case of polymethyl methacrylate.
また、上述した実施の形態１では、ポリカーボネート製のレンズ鏡筒２について説明したが、レンズ鏡筒２の材質はポリカーボネートに限るわけではない。例えば、ポリカーボネート以外の樹脂や、アルミニウム、マグネシウムなどの金属をレンズ鏡筒２の材質として採用しても構わない。 In Embodiment 1 described above, the lens barrel 2 made of polycarbonate has been described. However, the material of the lens barrel 2 is not limited to polycarbonate. For example, a resin other than polycarbonate, or a metal such as aluminum or magnesium may be adopted as the material of the lens barrel 2.
また、上述した実施の形態１では、光学部品および本体がそれぞれレンズ鏡筒２および筒本体２１である場合について説明したが、これらは例示に過ぎない。例えば、望遠鏡の主筒や接眼筒の内壁面に本発明を同様に適用することもできる。 In the first embodiment described above, the case where the optical component and the main body are the lens barrel 2 and the cylindrical main body 21, respectively, has been described. However, these are merely examples. For example, the present invention can be similarly applied to the inner wall surface of a telescope main tube or eyepiece tube.
また、上述した実施の形態１では、光学素子が前群レンズ群３および後群レンズ群４である場合について説明したが、前群レンズ群３および後群レンズ群４以外の光学素子を内部に収容する光学部品に本発明を同様に適用することも可能である。 In the first embodiment described above, the case where the optical elements are the front group lens group 3 and the rear group lens group 4 has been described. However, optical elements other than the front group lens group 3 and the rear group lens group 4 are provided inside. The present invention can be similarly applied to the optical component to be accommodated.
さらに、上述した実施の形態１では、バインダーが皮膜形成用樹脂７である場合について説明したが、筒本体２１の内壁面２１ａに微粒子６を固着する機能を有する限り、皮膜形成用樹脂７以外のバインダー（例えば、アルキド樹脂、フッ素樹脂、アクリル樹脂、エポキシ樹脂など）を代用することも可能である。 Furthermore, although Embodiment 1 mentioned above demonstrated the case where the binder was the resin 7 for film formation, as long as it has the function to adhere the microparticles | fine-particles 6 to the inner wall surface 21a of the cylinder main body 21, it is other than resin 7 for film formation. It is also possible to substitute a binder (for example, alkyd resin, fluororesin, acrylic resin, epoxy resin, etc.).
以下、本発明の実施例について説明する。なお、本発明は実施例に限定されるものではない。
＜実施例１＞
Examples of the present invention will be described below. In addition, this invention is not limited to an Example.
<Example 1>
粒子径が約２０μｍの多孔質球状ＰＭＭＡ微粒子（ポリメタクリル酸メチル樹脂からなる多孔質球状の微粒子）を、アクリルウレタン（皮膜形成用樹脂）をシンナーで希釈溶解した塗料中に４５質量％の割合で添加し、これを（株）シンキー製の攪拌装置「あわとり練太郎ＡＲ−５００」で十分に攪拌して多孔質球状ＰＭＭＡ微粒子をアクリルウレタン内で分散させることにより、黒色着色塗料を調製した。その後、アルミニウムからなる平板状の基材の上にこの黒色着色塗料をスプレー塗装し、オーブンで乾燥させることにより、基材上に厚さ約３０μｍの黒色塗装膜を形成した。 Porous spherical PMMA fine particles (porous spherical fine particles made of polymethyl methacrylate resin) having a particle diameter of about 20 μm are mixed at a ratio of 45% by mass in a paint obtained by diluting acrylic urethane (film forming resin) with thinner. A black colored paint was prepared by adding the mixture and sufficiently stirring it with a stirrer “Awatori Nertaro AR-500” manufactured by Shinkey Co., Ltd. to disperse the porous spherical PMMA fine particles in acrylic urethane. Then, this black coloring paint was spray-coated on the flat base material which consists of aluminum, and it dried in oven, and the black coating film about 30 micrometers thick was formed on the base material.
なお、ここでは、平板状の基材を円筒状の筒本体とみなした。これは、黒色塗装膜を形成する対象物の形状が平板状であろうと円筒状であろうと、黒色塗装膜の光沢度や明度指数に影響を及ぼさないとの考えに立脚するものである。
＜実施例２＞
Here, the flat substrate was regarded as a cylindrical tube body. This is based on the idea that the gloss or brightness index of the black coating film is not affected regardless of whether the shape of the object forming the black coating film is flat or cylindrical.
<Example 2>
粒子径が約２０μｍの多孔質球状ＰＭＭＡ微粒子に代えて、粒子径が約４５μｍの多孔質球状ＰＭＭＡ微粒子を用いたことを除き、上述した実施例１と同様の手順により、同様の基材上に同じ厚さの黒色塗装膜を形成した。
＜比較例１＞
A porous spherical PMMA fine particle having a particle diameter of about 45 μm was used in place of the porous spherical PMMA fine particle having a particle diameter of about 20 μm, and the same procedure was performed on the same substrate as in Example 1 described above. A black paint film having the same thickness was formed.
<Comparative Example 1>
粒子径が約２０μｍの多孔質球状ＰＭＭＡ微粒子に代えて、粒子径が約３μｍの多孔質球状シリカ微粒子（シリカからなる多孔質球状の微粒子）を用いたことを除き、上述した実施例１と同様の手順により、同様の基材上に同じ厚さの黒色塗装膜を形成した。
＜比較例２＞
Similar to Example 1 described above except that porous spherical silica fine particles (porous spherical fine particles made of silica) having a particle size of about 3 μm were used instead of the porous spherical PMMA fine particles having a particle size of about 20 μm. According to the procedure, a black paint film having the same thickness was formed on the same substrate.
<Comparative example 2>
多孔質球状ＰＭＭＡ微粒子に代えて、真球状ＰＭＭＡ微粒子（ポリメタクリル酸メチル樹脂からなる真球状の微粒子）を用いたことを除き、上述した実施例１と同様の手順により、同様の基材上に同じ厚さの黒色塗装膜を形成した。
＜比較例３＞
In place of the porous spherical PMMA fine particles, true spherical PMMA fine particles (true spherical fine particles made of polymethyl methacrylate resin) were used, and the same procedure as in Example 1 was performed on the same substrate. A black paint film having the same thickness was formed.
<Comparative Example 3>
多孔質球状ＰＭＭＡ微粒子に代えて、真球状ＰＭＭＡ微粒子（ポリメタクリル酸メチル樹脂からなる真球状の微粒子）を用いたことを除き、上述した実施例２と同様の手順により、同様の基材上に同じ厚さの黒色塗装膜を形成した。
＜光沢度および明度指数の測定＞
In place of the porous spherical PMMA fine particles, true spherical PMMA fine particles (true spherical fine particles made of polymethyl methacrylate resin) were used, and the same procedure as in Example 2 was performed on the same substrate. A black paint film having the same thickness was formed.
<Measurement of glossiness and brightness index>
これらの実施例１、２および比較例１〜３についてそれぞれ、入射角６０°および８５°における光沢度を測定するとともに、明度指数を測定した。なお、光沢度の測定は、ＪＩＳ Ｚ ８７４１に準拠して行った。その測定結果をまとめて表１に示す。
表１から明らかなように、光沢度については、比較例１〜３で０．２〜０．４（入射角６０°の場合）、０．７〜３．７（入射角８５°の場合）であったのに対して、実施例１、２では０（入射角６０°の場合）、０．１（入射角８５°の場合）となった。また、明度指数については、比較例１〜３で１１．５〜２１であったのに対して、実施例１、２では７．１〜７．５となった。 As is clear from Table 1, the glossiness is 0.2 to 0.4 (when the incident angle is 60 °) and 0.7 to 3.7 (when the incident angle is 85 °) in Comparative Examples 1 to 3. On the other hand, in Examples 1 and 2, it was 0 (when the incident angle was 60 °) and 0.1 (when the incident angle was 85 °). In addition, the brightness index was 11.5 to 21 in Comparative Examples 1 to 3, whereas it was 7.1 to 7.5 in Examples 1 and 2.
さらに細かく見ると、真球状ＰＭＭＡ微粒子に対する多孔質球状ＰＭＭＡ微粒子の優位性や、多孔質球状シリカ微粒子に対する多孔質球状ＰＭＭＡ微粒子の優位性が認められることが判明した。 Further, it has been found that the superiority of the porous spherical PMMA fine particles over the true spherical PMMA fine particles and the superiority of the porous spherical PMMA fine particles over the porous spherical silica fine particles are recognized.
すなわち、実施例１と比較例２では、粒子径が約２０μｍの微粒子の形状のみが異なる（前者では多孔質球状であるのに対して、後者では真球状である）ところ、両者の測定結果を比較すると、後者に比べて前者で光沢度および明度指数が低下した。また、実施例２と比較例３では、粒子径が約４５μｍの微粒子の形状のみが異なる（前者では多孔質球状であるのに対して、後者では真球状である）ところ、両者の測定結果を比較すると、後者に比べて前者で光沢度および明度指数が低下した。これらの結果から、多孔質球状ＰＭＭＡ微粒子が真球状ＰＭＭＡ微粒子より光沢度および明度指数の低下の点で優れていると結論付けることができる。 That is, Example 1 and Comparative Example 2 differ only in the shape of fine particles having a particle size of about 20 μm (the former is a porous sphere, whereas the latter is a true sphere). In comparison, glossiness and lightness index decreased in the former compared to the latter. Further, Example 2 and Comparative Example 3 differ only in the shape of fine particles having a particle diameter of about 45 μm (the former is a porous sphere, whereas the latter is a true sphere). In comparison, glossiness and lightness index decreased in the former compared to the latter. From these results, it can be concluded that porous spherical PMMA fine particles are superior to true spherical PMMA fine particles in terms of reduction in glossiness and brightness index.
また、実施例１と比較例１では、微粒子の材質および粒子径のみが異なる（前者では粒子径が約２０μｍのＰＭＭＡであるのに対して、後者では粒子径が約３μｍのシリカである）ところ、両者の測定結果を比較すると、後者に比べて前者で光沢度および明度指数が低下した。この結果から、多孔質球状ＰＭＭＡ微粒子が多孔質球状シリカ微粒子より光沢度および明度指数の低下の点で優れていると結論付けることができる。 Further, Example 1 and Comparative Example 1 differ only in the material and particle size of the fine particles (the former is PMMA having a particle size of about 20 μm, whereas the latter is silica having a particle size of about 3 μm). When the measurement results of both were compared, the glossiness and lightness index decreased in the former compared to the latter. From this result, it can be concluded that the porous spherical PMMA fine particles are superior to the porous spherical silica fine particles in terms of reduction in glossiness and brightness index.
本発明は、レンズ鏡筒ユニットのほか、ビデオカメラや望遠鏡、双眼鏡、顕微鏡など各種の光学機器に広く適用することができる。 The present invention can be widely applied to various optical devices such as video cameras, telescopes, binoculars, and microscopes in addition to lens barrel units.
１……レンズ鏡筒ユニット
２……レンズ鏡筒（光学部品）
３……前群レンズ群（光学素子）
４……後群レンズ群（光学素子）
５……黒色塗装膜
６……微粒子
７……皮膜形成用樹脂（バインダー）
２１……筒本体（本体）
２１ａ……内壁面
２２……第１レンズ保持部
２３……第２レンズ保持部
1 …… Lens barrel unit 2 …… Lens barrel (optical component)
3. Front lens group (optical element)
4. Rear lens group (optical element)
5 …… Black paint film 6 …… Particles 7 …… Resin for film formation (binder)
21 …… Cylinder body (body)
21a …… Inner wall surface 22 …… First lens holding portion 23 …… Second lens holding portion
Claims (6)
前記本体の内壁面には、バインダーによって当該内壁面に固着された高分子材料からなる複数の多孔質の微粒子を含む黒色塗装膜が形成され、
前記各微粒子の屈折率は、前記バインダーの屈折率とほぼ同一であり、
前記複数の微粒子は、粒子径が２０μｍ以上であり、少なくともその一部が前記バインダーの表面から突出する形で前記本体の内壁面のほぼ全面を覆っており、
前記黒色塗装膜は、前記多孔質の微粒子と前記バインダーとを含む塗料を前記本体の内壁面に塗布して乾燥させることにより得られたものであることを特徴とする光学部品。 An optical component having a body that houses an optical element therein,
On the inner wall surface of the main body is formed a black coating film containing a plurality of porous fine particles made of a polymer material fixed to the inner wall surface by a binder,
The refractive index of each fine particle is substantially the same as the refractive index of the binder,
The plurality of fine particles have a particle diameter of 20 μm or more, and at least part of the fine particles covers almost the entire inner wall surface of the main body in a form protruding from the surface of the binder,
The optical component, wherein the black paint film is obtained by applying and drying a paint containing the porous fine particles and the binder on the inner wall surface of the main body.
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| JP6076041B2 (en) * | 2012-11-01 | 2017-02-08 | オリンパス株式会社 | Optical element and optical element manufacturing method |
| WO2016009734A1 (en) * | 2014-07-17 | 2016-01-21 | シャープ株式会社 | Optical structure and optical element |
| JP2017032781A (en) * | 2015-07-31 | 2017-02-09 | 富士フイルム株式会社 | Antireflection film, polarizing plate, cover glass, image display device, and method for manufacturing antireflection film |
| GB2567238B (en) * | 2017-10-09 | 2020-01-08 | Surrey Nanosystems Ltd | Paint with low light reflectivity |
| CN111201137B (en) * | 2017-10-10 | 2022-11-01 | 东丽株式会社 | Film |
| JP7154921B2 (en) * | 2018-09-28 | 2022-10-18 | キヤノン株式会社 | Optical device, lens hood, method for manufacturing optical device, and method for manufacturing lens hood |
| JP7442345B2 (en) * | 2020-03-06 | 2024-03-04 | 株式会社きもと | low reflective material |
| JP2021140072A (en) * | 2020-03-06 | 2021-09-16 | 株式会社きもと | Resin composition for low reflection light-shielding layer, and low reflection light-shielding layer and low reflection light-shielding layer laminate using the same |
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| JPH10142402A (en) * | 1996-11-06 | 1998-05-29 | Fuji Photo Film Co Ltd | Antireflection film and display device arranged therewith |
| JPH1164703A (en) * | 1997-08-22 | 1999-03-05 | Canon Inc | Lens barrel unit and its parts |
| JP3899011B2 (en) * | 2001-10-25 | 2007-03-28 | 松下電工株式会社 | Surface emitter |
| JP4107050B2 (en) * | 2001-10-25 | 2008-06-25 | 松下電工株式会社 | Coating material composition and article having a coating formed thereby |
| JP2003292831A (en) * | 2002-04-02 | 2003-10-15 | Toppan Printing Co Ltd | Coating agent having low refractive index and reflection preventive film |
| JP2004143261A (en) * | 2002-10-23 | 2004-05-20 | Kuraray Co Ltd | Light-diffusing resin composition |
| JP2006010724A (en) * | 2004-06-22 | 2006-01-12 | Nitto Denko Corp | Light-diffusive antiglare film |
| JP2007148398A (en) * | 2005-11-07 | 2007-06-14 | Fujifilm Corp | Optical film, anti-reflection film, polarizing plate and image display device |
| JP5097381B2 (en) * | 2006-11-02 | 2012-12-12 | ソマール株式会社 | Shielding film and method for producing the same |
| JP2008152199A (en) * | 2006-12-20 | 2008-07-03 | Konica Minolta Opto Inc | Antiglare antireflection film, polarizing plate and display apparatus each using the same |
| JP2009157234A (en) * | 2007-12-27 | 2009-07-16 | Nof Corp | Anti-glare and antireflection film and liquid crystal display having the same |
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