JP5397082B2 - Surface processing method of lens frame member - Google Patents

Surface processing method of lens frame member Download PDF

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JP5397082B2
JP5397082B2 JP2009187782A JP2009187782A JP5397082B2 JP 5397082 B2 JP5397082 B2 JP 5397082B2 JP 2009187782 A JP2009187782 A JP 2009187782A JP 2009187782 A JP2009187782 A JP 2009187782A JP 5397082 B2 JP5397082 B2 JP 5397082B2
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lens
frame member
lens frame
antireflection
treatment
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JP2010186157A (en
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歳久 木下
和広 山田
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Ricoh Imaging Co Ltd
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Ricoh Imaging Co Ltd
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本発明は、鏡枠部材(例えば、レンズ支持枠や押え環等)の表面に反射防止面を形成する鏡枠部材の表面加工方法に関する。 The present invention relates to a surface processing method for a lens frame member that forms an antireflection surface on the surface of a lens frame member (for example, a lens support frame, a presser ring, etc.) .

カメラの撮影レンズ等のレンズ鏡筒は複数のレンズを内部に支持する為、レンズ支持環や間隔環などの鏡枠部材を複数具備している。そして、これら鏡枠部材の表面には反射防止加工を施すのが一般的である。反射防止加工を施せば、鏡枠部材の表面に撮影光路から外れた光が当たっても光の反射が抑えられるので、ゴーストやフレアが発生し難くなる。   A lens barrel such as a photographing lens of a camera includes a plurality of lens frame members such as a lens support ring and a spacing ring in order to support a plurality of lenses therein. In general, the surfaces of these lens frame members are subjected to antireflection processing. When antireflection processing is performed, reflection of light is suppressed even when light deviating from the photographing optical path hits the surface of the lens barrel member, so that ghost and flare are less likely to occur.

特許文献1では、レンズ支持環(鏡枠)の内周面にリソグラフィー技術や、陽極酸化法(内周面をアルミニウム製薄膜によって覆っている場合)を用いて微細凹凸構造を形成したり、レンズ支持環の内周面にブラックアルマイト処理を施した上で、該内周面の表面に微細凹凸構造を備えるシートを貼り付けている。反射防止加工である微細凹凸構造の凹凸は規則的な配列(あるいはやや規則性が失われた配列)となっている。
特許文献2では、レンズ支持環の内周面の表面にアレイ状(規則的な配列)の微細凹凸構造(反射防止構造)を備えるシートを貼り付けたり、成形型を利用した射出成形によりレンズ支持環の内周面にアレイ状の微細凹凸構造を一体成形している。
特許文献3では、間隔環の表面に反射防止加工として微粒子を分散した電着塗装を施している。
In Patent Document 1, a fine concavo-convex structure is formed on the inner peripheral surface of a lens support ring (mirror frame) using a lithography technique or an anodic oxidation method (when the inner peripheral surface is covered with an aluminum thin film), or a lens. A black alumite treatment is applied to the inner peripheral surface of the support ring, and a sheet having a fine concavo-convex structure is attached to the surface of the inner peripheral surface. The unevenness of the fine concavo-convex structure which is an antireflection process has a regular arrangement (or an arrangement in which regularity is somewhat lost).
In Patent Document 2, a lens support is affixed by attaching a sheet having an array-like (regular arrangement) fine concavo-convex structure (antireflection structure) to the surface of the inner peripheral surface of the lens support ring, or by injection molding using a mold. An array of fine concavo-convex structures is integrally formed on the inner peripheral surface of the ring.
In patent document 3, the electrodeposition coating which disperse | distributed microparticles | fine-particles is given to the surface of a space | interval ring as an antireflection process.

特開2005−156989号公報JP 2005-156989 A 特開2006−293093号公報JP 2006-293093 A 特開平11−64703号公報JP-A-11-64703

特許文献1及び特許文献2のような微細凹凸構造の反射防止機能は十分とは言えず、ゴーストやフレアの発生を抑制するのが難しい。また、特許文献1のようにレンズ支持環の内周面にブラックアルマイト処理を施すと該内周面は黒くなるものの、黒さとして十分ではないので、この部分による反射防止機能はあまり高くなく、しかも見た目も美しくない。
また、特許文献1及び特許文献2のようにリソグラフィー技術、陽極酸化法、あるいは射出成形により、規則的に(あるいはやや規則性が失われた)配列した微細凹凸構造をレンズ支持環の内周面に形成するのは容易ではない。さらに、特許文献1において陽極酸化法を利用する場合はレンズ支持環の内周面にアルミニウム製薄膜を形成する必要があるが、アルミニウム製薄膜を形成すること自体が困難である。
The antireflection function of the fine concavo-convex structure as in Patent Document 1 and Patent Document 2 is not sufficient, and it is difficult to suppress the generation of ghosts and flares. In addition, when the black alumite treatment is performed on the inner peripheral surface of the lens support ring as in Patent Document 1, the inner peripheral surface becomes black, but the blackness is not sufficient, so the antireflection function by this portion is not so high, Moreover, it does not look beautiful.
In addition, as in Patent Document 1 and Patent Document 2, the fine concavo-convex structure arranged regularly (or slightly lost regularity) by lithography technology, anodizing method, or injection molding is used as the inner peripheral surface of the lens support ring. It is not easy to form. Furthermore, when the anodizing method is used in Patent Document 1, it is necessary to form an aluminum thin film on the inner peripheral surface of the lens support ring, but it is difficult to form the aluminum thin film itself.

また、特許文献3のような反射防止加工は反射防止機能として不十分であるため、ゴーストやフレアを効果的に抑制するのが難しい。
しかも、塗装が剥げ落ちやすいので、反射機能の低下、ゴミの発生などの問題が生じ易い。
Moreover, since the antireflection processing as in Patent Document 3 is insufficient as an antireflection function, it is difficult to effectively suppress ghosts and flares.
In addition, since the paint is easily peeled off, problems such as a reduction in reflection function and generation of dust are likely to occur.

本発明は、反射防止機能が高く、成形が容易であり、しかも見た目が美しい鏡枠部材の表面加工方法を提供することを目的とする。 An object of the present invention is to provide a surface processing method for a lens frame member that has a high antireflection function, is easy to mold, and has a beautiful appearance.

本発明の鏡枠部材の表面加工方法は、アルミニウム又はステンレスからなる鏡枠部材の表面に反射防止面を形成する鏡枠部材の表面加工方法であって、アルミニウム又はステンレスからなる上記鏡枠部材の表面に、酸化皮膜処理又は不動態皮膜処理を施すステップ;酸化皮膜処理又は不動態皮膜処理を施した上記鏡枠部材の表面のうち、反射防止面形成面以外の面にマスキングを施すステップ;酸化皮膜処理又は不動態皮膜処理を施した上記鏡枠部材の表面のうち、マスキングを施していない上記反射防止面形成面に、ニッケルめっき処理又はニッケル合金めっき処理を施すステップ;上記マスキングを除去するステップ;及びマスキングを除去した上記鏡枠部材にエッチング処理を施して、上記鏡枠部材のニッケルめっき処理又はニッケル合金めっき処理を施した上記反射防止面形成面に、高さが0.5〜5μmかつピッチが0.1〜10μmである多数の微小突起をランダムに形成した反射防止面を形成するステップ;を有することを特徴としている。A surface processing method for a lens frame member according to the present invention is a surface processing method for a lens frame member for forming an antireflection surface on the surface of a lens frame member made of aluminum or stainless steel. A step of performing an oxide film treatment or a passive film treatment on the surface; a step of masking a surface other than the antireflection surface forming surface among the surfaces of the lens frame member subjected to the oxide film treatment or the passive film treatment; Step of performing nickel plating treatment or nickel alloy plating treatment on the antireflection surface forming surface that is not masked out of the surface of the lens frame member that has been subjected to film treatment or passive film treatment; step of removing the masking And etching the lens frame member from which masking has been removed, and nickel plating treatment or nickel of the lens frame member Forming an antireflection surface on which a plurality of minute protrusions having a height of 0.5 to 5 μm and a pitch of 0.1 to 10 μm are randomly formed on the antireflection surface forming surface subjected to the gold plating treatment; It is characterized by having.

上記鏡枠部材は、レンズ又はレンズ枠が嵌合される内円筒面を有し、上記微小突起は、この鏡枠部材の内円筒面のうち、レンズ又はレンズ枠との嵌合面を除く表面に形成されることが好ましい。The lens frame member has an inner cylindrical surface to which the lens or the lens frame is fitted, and the minute protrusion is a surface of the inner cylindrical surface of the lens frame member excluding the lens or the lens frame fitting surface. It is preferable to be formed.

上記鏡枠部材は、その表面に、上記酸化皮膜処理又は不動態皮膜処理とは別に、黒アルマイト処理が施されていることが好ましい。The lens frame member is preferably subjected to black alumite treatment on the surface separately from the oxide film treatment or the passive film treatment.

本発明のように、ニッケルめっき処理、ニッケル合金めっき処理、または前記いずれかのめっき処理後にエッチング処理することにより、該表面に高さが0.5〜5μmかつピッチが0.1〜10μmである多数の微小突起をランダムに形成した反射防止面を形成すると、この反射防止面は従来の鏡枠部材に比べてより黒くなる。そのため、従来の鏡枠部材に比べて反射防止機能が高くなるので、ゴーストやフレアの発生を効果的に抑制できる。しかも見た目も美しくなる。さらに、ニッケルめっき処理又はニッケル合金めっき処理を施した後にエッチング処理するだけであり、かつ微小突起はランダムな配列でよいので(規則的に配列する必要がないので)、本発明の反射防止面は鏡枠部材の表面に容易に成形できる。
しかも、安価に成形できる。
その上、ニッケルめっき及びニッケル合金めっきは延性があり剥離しにくいので、ゴミが発生しにくい。
As in the present invention, the surface has a height of 0.5 to 5 μm and a pitch of 0.1 to 10 μm by etching after nickel plating, nickel alloy plating, or any one of the above plating processes. When an antireflection surface in which a large number of minute protrusions are randomly formed is formed, this antireflection surface becomes blacker than a conventional lens frame member. Therefore, since the antireflection function is higher than that of the conventional lens frame member, it is possible to effectively suppress the occurrence of ghosts and flares. Moreover, it looks beautiful. Furthermore, since it is only necessary to perform etching after nickel plating treatment or nickel alloy plating treatment, and the microprotrusions may be randomly arranged (since it is not necessary to arrange them regularly), the antireflection surface of the present invention is It can be easily formed on the surface of the lens frame member.
Moreover, it can be formed at low cost.
In addition, since nickel plating and nickel alloy plating are ductile and difficult to peel off, dust is not easily generated.

環状部材の内部に挿入される鏡枠部材(例えば間隔環)の表面の内周面領域には高さが0.5〜5μmでピッチが0.1〜10μmである多数の微小突起(ニッケルめっき)を施し、外周面領域には突起を形成しないか又はこれより低い突起を形成すれば、当該鏡枠部材の外径が大きくなることはない。そのため、環状部材の内周面に鏡枠部材を円滑かつ精度良く組み付けることができる。   A large number of minute projections (nickel plating) having a height of 0.5 to 5 μm and a pitch of 0.1 to 10 μm are formed on the inner peripheral surface region of the surface of a lens frame member (for example, a spacing ring) inserted into the annular member. ) And no protrusion is formed on the outer peripheral surface area or a protrusion lower than this is formed, the outer diameter of the lens barrel member does not increase. Therefore, the lens frame member can be assembled smoothly and accurately on the inner peripheral surface of the annular member.

本発明の第1の実施形態のレンズ鏡筒の内部を示す縦断側面図である。It is a vertical side view which shows the inside of the lens-barrel of the 1st Embodiment of this invention. 間隔環に施した4種類の表面処理の拡大写真である。It is an enlarged photograph of four types of surface treatments applied to the spacing ring. 比較例(図2(a))の表面処理の色度を示したCIE色度座標である。It is a CIE chromaticity coordinate which showed the chromaticity of the surface treatment of a comparative example (FIG. 2 (a)). 間隔環に本発明を利用して施した表面処理(実施例、図2(c))の色度を示したCIE色度座標である。It is a CIE chromaticity coordinate which showed the chromaticity of the surface treatment (Example, FIG.2 (c)) given using this invention to the space | interval ring. 図3Bとは別の実施例(図2(d))の表面処理の色度を示したCIE色度座標である。3C is a CIE chromaticity coordinate indicating the chromaticity of the surface treatment of another embodiment (FIG. 2D) different from FIG. 3B. さらに別の実施例(図2(b))の表面処理の色度を示したCIE色度座標である。It is a CIE chromaticity coordinate which showed the chromaticity of the surface treatment of another Example (FIG.2 (b)). 比較例(図2(a))の表面処理の視感反射率を示すグラフである。It is a graph which shows the luminous reflectance of the surface treatment of a comparative example (Fig.2 (a)). 図3Bに相当する実施例(図2(c))の表面処理の視感反射率を示すグラフである。It is a graph which shows the luminous reflectance of the surface treatment of the Example (FIG.2 (c)) equivalent to FIG. 3B. 図3Cに相当する実施例(図2(d))の表面処理の視感反射率を示すグラフである。It is a graph which shows the luminous reflectance of the surface treatment of the Example (Drawing 2 (d)) equivalent to Drawing 3C. 図3Dに相当する実施例(図2(b))の表面処理の視感反射率を示すグラフである。It is a graph which shows the luminous reflectance of the surface treatment of the Example (FIG.2 (b)) equivalent to FIG. 3D. 本発明の第2の実施形態のレンズ鏡筒の内部を示す縦断側面図である。It is a vertical side view which shows the inside of the lens barrel of the 2nd Embodiment of this invention. 本発明によるレンズ鏡筒(鏡枠部材)の表面加工方法の第1の態様を示す工程図である。It is process drawing which shows the 1st aspect of the surface processing method of the lens-barrel (lens frame member) by this invention. 本発明によるレンズ鏡筒(鏡枠部材)の表面加工方法の第2の態様を示す工程図である。It is process drawing which shows the 2nd aspect of the surface processing method of the lens-barrel (lens frame member) by this invention.

以下、図1〜図4を利用して本発明の第1の実施形態を説明する。以下の説明では図1の左側を「前方」とし図1の右側を「後方」としている。
本実施形態のレンズ鏡筒10は交換式レンズ鏡筒であり、その内部に、金属製の筒状部材であり、かつ前後方向の中間部に径方向内向きの内方フランジ12を一体的に備えるレンズ支持枠(鏡枠部材)11を具備している。
レンズ支持枠11の内部には、樹脂製またはガラス製で無色透明かつ光軸Oを中心とする回転対称形状の1群レンズ(光学系)L1、2群レンズ(光学系)L2及び3群レンズ(光学系)L3が設けてある。
1群レンズL1は内方フランジ12の前方に位置しており、その後端縁(外周縁)は内方フランジ12の前面に当接している。さらに、1群レンズL1の直前には1群レンズL1と同心をなす金属製の環状部材である押さえ環(鏡枠部材)15が位置しており、押さえ環15の外周面に形成した雄ねじ15a(ねじ部)がレンズ支持枠11の内周面に形成した雌ねじ11a(ねじ部)と螺合している。そのため、1群レンズL1は押さえ環15と内方フランジ12によって前後から挟持されている。
2群レンズL2と3群レンズL3は内方フランジ12の後方に位置している。光軸Oを中心とする回転対称形状である2群レンズL2の前端縁(外周縁)は、内方フランジ12の後面に当接している。2群レンズL2の直後にはレンズ支持枠11と同心をなす金属製の環状部材である間隔環(鏡枠部材)16が位置しており、間隔環16の外周面はレンズ支持枠11の内周面に接触している。間隔環16の前後両面は光軸Oに対して直交する平面であり、間隔環16の前面が、2群レンズL2の後面の外周縁部に接触している。そのため、2群レンズL2は、内方フランジ12と間隔環16によって前後から挟持されている。間隔環16の直後には3群レンズL3が位置しており、3群レンズL3の直後には押さえ環15及び間隔環16と同心をなす金属製の環状部材である押さえ環(鏡枠部材)17が位置しており、押さえ環17の外周面に形成した雄ねじ(ねじ部)17aがレンズ支持枠11の内周面に形成した雌ねじ(ねじ部)11bと螺合している。図示するように、3群レンズL3は、間隔環16の後面(の外周縁部)と押さえ環17の前面(の内周縁部)によって前後から挟持されている。
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the following description, the left side of FIG. 1 is “front” and the right side of FIG. 1 is “rear”.
The lens barrel 10 of the present embodiment is an interchangeable lens barrel, and is a metallic cylindrical member, and a radially inward inner flange 12 is integrally formed in an intermediate portion in the front-rear direction. A lens support frame (lens frame member) 11 is provided.
Inside the lens support frame 11, a first group lens (optical system) L1, a second group lens (optical system) L2, and a third group lens, which are made of resin or glass, are colorless and transparent, and have a rotationally symmetrical shape about the optical axis O. (Optical system) L3 is provided.
The first group lens L1 is positioned in front of the inner flange 12, and the rear edge (outer peripheral edge) is in contact with the front surface of the inner flange 12. Further, a presser ring (lens frame member) 15 that is a metal annular member concentric with the first group lens L1 is positioned immediately before the first group lens L1, and a male screw 15a formed on the outer peripheral surface of the presser ring 15 is provided. The (screw portion) is screwed with a female screw 11 a (screw portion) formed on the inner peripheral surface of the lens support frame 11. Therefore, the first group lens L1 is sandwiched from the front and rear by the pressing ring 15 and the inner flange 12.
The second group lens L2 and the third group lens L3 are located behind the inner flange 12. The front end edge (outer peripheral edge) of the second group lens L <b> 2 having a rotationally symmetric shape about the optical axis O is in contact with the rear surface of the inner flange 12. Immediately after the second group lens L2, an interval ring (lens frame member) 16 which is a metal annular member concentric with the lens support frame 11 is located, and the outer peripheral surface of the interval ring 16 is located inside the lens support frame 11. It is in contact with the peripheral surface. Both front and rear surfaces of the spacing ring 16 are planes orthogonal to the optical axis O, and the front surface of the spacing ring 16 is in contact with the outer peripheral edge of the rear surface of the second group lens L2. Therefore, the second group lens L2 is sandwiched from the front and rear by the inner flange 12 and the spacing ring 16. The third group lens L3 is located immediately after the interval ring 16, and immediately after the third group lens L3, a holding ring (lens frame member) which is a metal annular member concentric with the holding ring 15 and the interval ring 16. 17 is located, and a male screw (threaded portion) 17 a formed on the outer peripheral surface of the holding ring 17 is screwed with a female screw (threaded portion) 11 b formed on the inner peripheral surface of the lens support frame 11. As shown in the drawing, the third lens group L3 is sandwiched from the front and rear by the rear surface (the outer peripheral edge portion thereof) of the spacing ring 16 and the front surface (the inner peripheral edge portion thereof) of the pressing ring 17.

レンズ支持枠11、押さえ環15、間隔環16及び押さえ環17の表面の一部には反射防止面が形成されている。この反射防止面は、ニッケルめっき処理、ニッケル合金めっき処理、又はこれらいずれかのめっき処理後にエッチング処理することにより形成されるものであり、高さが0.5〜5μmかつピッチが0.1〜10μmである多数の微小突起をランダムな配列に形成してなる。但し、レンズ支持枠11の表面にニッケルめっき処理を行う際には内方フランジ12の内周面を除く部分にはシール(図示略)を貼ってマスキングする。同様に、押さえ環15の外周面と後面、間隔環16の外周面と前後両面、及び、押さえ環17の外周面と前面にもシール(図示略)を貼ってマスキングする。そのため、レンズ支持枠11、押さえ環15、間隔環16及び押さえ環17の表面における上記シールを貼ったマスキング部分にはニッケルめっき処理は施されない(反射防止面は形成されない)。これら各シールはニッケルめっきを施した後に、レンズ支持枠11、押さえ環15、間隔環16及び押さえ環17からそれぞれ剥がされる。なお、マスキングする部分の形状に因っては、シールを貼る代わりにレジスト等の樹脂を塗布してマスキングしたり、専用のマスキング治具を事前に準備して利用しても良い。専用のマスキング治具を使えば精度よくマスキングできる。   Antireflection surfaces are formed on part of the surfaces of the lens support frame 11, the pressing ring 15, the spacing ring 16, and the pressing ring 17. This antireflection surface is formed by etching after nickel plating treatment, nickel alloy plating treatment, or any one of these plating treatments, and has a height of 0.5 to 5 μm and a pitch of 0.1 to 0.1 μm. A large number of microprojections having a size of 10 μm are formed in a random arrangement. However, when nickel plating is performed on the surface of the lens support frame 11, a mask (not shown) is applied to the portion excluding the inner peripheral surface of the inner flange 12 for masking. Similarly, seals (not shown) are also applied to the outer peripheral surface and rear surface of the press ring 15, the outer peripheral surface and both front and rear surfaces of the spacing ring 16, and the outer peripheral surface and front surface of the press ring 17 for masking. For this reason, the nickel plating treatment is not performed on the masking portions to which the seals are attached on the surfaces of the lens support frame 11, the pressing ring 15, the spacing ring 16, and the pressing ring 17 (the antireflection surface is not formed). Each of these seals is peeled off from the lens support frame 11, the holding ring 15, the spacing ring 16 and the holding ring 17 after nickel plating. Depending on the shape of the portion to be masked, a masking may be applied by applying a resin such as a resist instead of sticking a seal, or a dedicated masking jig may be prepared and used in advance. Masking can be performed with high accuracy using a dedicated masking jig.

ニッケルめっき処理、ニッケル合金めっき処理、又はこれらいずれかのめっき処理後にエッチング処理を施すと、レンズ支持枠11、押さえ環15、間隔環16及び押さえ環17の表面におけるシールを貼らなかった部分(マスキングしなかった部分)は黒色となる。
図2(b)〜(d)は本実施形態の反射防止面(微小突起)を拡大して示す写真である。図2(b)(c)は、ニッケルめっき処理又はニッケル合金めっき処理により反射防止面を形成したものであり、図2(d)は、ニッケルめっき処理又はニッケル合金めっき処理後さらにエッチング処理を施すことにより反射防止面を形成したものである。
図2(a)に示すAM−BS処理(梨地処理した基板に黒アルマイト処理したもの。比較例)と比べると、図2(b)〜(d)に示す本実施形態の反射防止面(微小突起)の詳細形状が異なるのが分かる。
When the nickel plating treatment, the nickel alloy plating treatment, or any of these plating treatments is performed, the portions on the surfaces of the lens support frame 11, the retaining ring 15, the spacing ring 16, and the retaining ring 17 where the seal is not applied (masking) The part that was not) is black.
2B to 2D are photographs showing the antireflection surface (microprojections) of the present embodiment in an enlarged manner. 2B and 2C show an antireflection surface formed by nickel plating treatment or nickel alloy plating treatment, and FIG. 2D shows further etching treatment after nickel plating treatment or nickel alloy plating treatment. Thus, an antireflection surface is formed.
Compared with the AM-BS treatment shown in FIG. 2 (a) (a black-anodized treatment on a satin-treated substrate, a comparative example), the antireflection surface of the present embodiment shown in FIGS. It can be seen that the detailed shape of the projections is different.

図3A〜図3Dに示すCIE色度座標から明らかなように、図2(d)の実施例のニッケルめっき処理又はニッケル合金めっき処理後エッチング処理したもの(NO3。図3C)は、AM−BS処理(NO1。図3A)や、図2(b)の実施例のニッケルめっき(NO4。図3D)、図2(c)の実施例のニッケルめっき(NO2。図3B)に比べてより黒いのが分かる。
そして、図4A〜図4Dに示す視感反射率を示すグラフから明らかなように、本実施形態(図2(b):図4D、図2(c):図4B、図2(d):図4C)のものはいずれも、波長が400nm〜680nmの光に対する反射率が0.3%以下である。図2(d)のニッケルめっき(NO3。図4C)は視感反射率が最も低い。これは図2(d)の微小突起構造が図2(b)及び(c)の微小突起構造に比べて最もピッチが大きく、高さも高いことによるものである。一方、図2(c)の微小突起構造は図2(d)の微小突起構造に比べて強度の点で優れている。図2(b)の微小突起構造は、(d)と(c)の中間的な特性を有する。どの実施例の態様で実施するかは、微小突起を設ける位置等の条件によって判断、選択することが可能である。
As is apparent from the CIE chromaticity coordinates shown in FIGS. 3A to 3D, the nickel-plated or nickel-alloy plated-etched product (NO3, FIG. 3C) of the embodiment of FIG. Compared to the treatment (NO1. FIG. 3A), the nickel plating (NO4. FIG. 3D) of the embodiment of FIG. 2 (b), and the nickel plating (NO2. FIG. 3B) of the embodiment of FIG. I understand.
As is apparent from the graphs showing the luminous reflectance shown in FIGS. 4A to 4D, the present embodiment (FIG. 2B: FIG. 4D, FIG. 2C: FIG. 4B, FIG. 2D): 4C) has a reflectance of 0.3% or less for light having a wavelength of 400 nm to 680 nm. The nickel plating (NO3, FIG. 4C) in FIG. 2 (d) has the lowest luminous reflectance. This is because the microprojection structure of FIG. 2 (d) has the largest pitch and height compared to the microprojection structures of FIGS. 2 (b) and 2 (c). On the other hand, the microprojection structure shown in FIG. 2C is superior in strength compared to the microprojection structure shown in FIG. The microprojection structure shown in FIG. 2B has intermediate characteristics between (d) and (c). Which embodiment is used can be determined and selected according to conditions such as a position where a minute protrusion is provided.

このように本実施形態のレンズ支持枠11、押さえ環15、間隔環16及び押さえ環17に形成した反射防止面は、従来の鏡枠部材に比べて反射防止機能が高いので、ゴーストやフレアの発生を効果的に抑制できる。しかも、従来より黒いので見た目も美しい。
さらに、本実施形態の反射防止加工はニッケルめっき処理、ニッケル合金めっき処理、又はこれらいずれかのめっき処理後にエッチング処理するだけで実現でき、しかも微小突起はランダムな配列でよいので、鏡枠部材の表面に容易に成形できる。しかも、ニッケルめっき又はニッケル合金めっきなので安価に成形できる。その上、ニッケルめっき又はニッケル合金めっきは延性があり剥離しにくいので、ゴミが発生しにくい。
また、レンズ支持枠11における内方フランジ12を除く内周面、押さえ環15の外周面、間隔環16の外周面、及び押さえ環17の外周面にはニッケルめっき処理を施していないので(反射防止面を形成していないので)、レンズ支持枠11の内径、並びに押さえ環15、間隔環16及び押さえ環17の外径が大きくなることはない。そのため、レンズ支持枠11の内周面に押さえ環15、間隔環16及び押さえ環17を円滑かつ精度良く組み付けることができる。
As described above, the antireflection surfaces formed on the lens support frame 11, the presser ring 15, the spacing ring 16, and the presser ring 17 of the present embodiment have a higher antireflection function than conventional lens frame members. Generation can be effectively suppressed. Moreover, it looks black because it is blacker than before.
Furthermore, the antireflection processing of the present embodiment can be realized only by etching after nickel plating treatment, nickel alloy plating treatment, or any one of these plating treatments, and the minute projections can be arranged in a random manner. Can be easily molded on the surface. And since it is nickel plating or nickel alloy plating, it can shape | mold cheaply. In addition, since nickel plating or nickel alloy plating is ductile and difficult to peel off, dust is hardly generated.
Further, the inner peripheral surface excluding the inner flange 12 in the lens support frame 11, the outer peripheral surface of the pressing ring 15, the outer peripheral surface of the spacing ring 16, and the outer peripheral surface of the pressing ring 17 are not subjected to nickel plating (reflection). Since the prevention surface is not formed, the inner diameter of the lens support frame 11 and the outer diameters of the pressing ring 15, the spacing ring 16, and the pressing ring 17 do not increase. Therefore, the presser ring 15, the spacing ring 16, and the presser ring 17 can be assembled smoothly and accurately on the inner peripheral surface of the lens support frame 11.

続いて、本発明の第2の実施形態について図5を用いて説明する。なお、第1の実施形態と同じ部材には同じ符号を付すに止めて、その詳細な説明は省略する。
本実施形態のレンズ鏡筒20は、共に金属製の筒状部材である第1レンズ支持枠21と第1レンズ支持枠21の後端部に接続する第2レンズ支持枠25とを具備している。
第1レンズ支持枠21はレンズ支持枠11に類似した構造であり、内方フランジ12の内周面と押さえ環15の内周面及び前面にはレンズ鏡筒10と同様の要領によって反射防止面が形成してある。第1レンズ支持枠21の内方フランジ12より後方の内周面は光軸Oを中心とする環状面である内周ガイド面(ガイド部)22となっており、かつ後端部の外周面には雄ねじ(ねじ部)23が形成してある。内周ガイド面22内には、光軸Oを中心とする樹脂製の環状部材である移動レンズ枠24が位置しており、移動レンズ枠24の外周面(ガイド部)24aが内周ガイド面22に接触している。さらに、移動レンズ枠24の内周面には2群レンズL2’が嵌合固定してある。移動レンズ枠24は内周ガイド面22によって光軸O方向にスライド可能に支持されており、かつ移動レンズ枠24はモータ(図示略)と連動機構(図示略)を介して接続している。従って、モータを正逆に回転させると、移動レンズ枠24及び2群レンズL2’は第1レンズ支持枠21に対して光軸O方向(矢印方向)に進退する。
第2レンズ支持枠25はその径が3段階で変化するものであり、前端部の内周面には雄ねじ23に螺合する雌ねじ(ねじ部)26が形成してあり、第2レンズ支持枠25の内周面の後端部に3群レンズL3’が嵌合固定してある。さらに、第2レンズ支持枠25の中間径部27には周方向に等角度間隔で3つのねじ穴(穴部)28が貫通穴として穿設してある。このねじ穴28は図示を省略したボルトが貫通させ、該ボルトを利用して第2レンズ支持枠25をレンズ鏡筒20内部の固定部材(図示略)に固定するためのものである。なお、このねじ穴28の代わりに単なる貫通穴(穴部)を形成し、該貫通穴を貫通させたピンによって第2レンズ支持枠25を上記固定部材に固定してもよい。
中間径部27の内周面、及び、中間径部27と最小径部29を接続しかつ光軸Oに対して直交する環状壁部30の前面にはレンズ鏡筒10と同様の要領によって反射防止面が形成してある(但し、ねじ穴28または上記貫通穴の周面には反射防止面を形成しない)。さらに、第2レンズ支持枠25の後端に形成した内方フランジ31の前面及び内周面にもレンズ鏡筒10と同様の要領によって反射防止面が形成してある。
Subsequently, a second embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals, and detailed description thereof is omitted.
The lens barrel 20 of the present embodiment includes a first lens support frame 21 and a second lens support frame 25 connected to the rear end portion of the first lens support frame 21, both of which are metal cylindrical members. Yes.
The first lens support frame 21 has a structure similar to the lens support frame 11, and the inner peripheral surface of the inner flange 12 and the inner peripheral surface and front surface of the pressing ring 15 are antireflection surfaces by the same procedure as the lens barrel 10. Is formed. The inner peripheral surface behind the inner flange 12 of the first lens support frame 21 is an inner peripheral guide surface (guide portion) 22 that is an annular surface centered on the optical axis O, and the outer peripheral surface of the rear end portion. Is formed with a male screw (threaded portion) 23. A movable lens frame 24, which is an annular member made of resin centered on the optical axis O, is located in the inner peripheral guide surface 22, and an outer peripheral surface (guide portion) 24a of the movable lens frame 24 is an inner peripheral guide surface. 22 is in contact. Further, a second lens group L2 ′ is fitted and fixed to the inner peripheral surface of the moving lens frame 24. The moving lens frame 24 is supported by the inner peripheral guide surface 22 so as to be slidable in the direction of the optical axis O, and the moving lens frame 24 is connected to a motor (not shown) via an interlocking mechanism (not shown). Accordingly, when the motor is rotated in the forward and reverse directions, the moving lens frame 24 and the second group lens L2 ′ advance and retract in the optical axis O direction (arrow direction) with respect to the first lens support frame 21.
The diameter of the second lens support frame 25 changes in three stages, and an internal thread (threaded portion) 26 that engages with the external thread 23 is formed on the inner peripheral surface of the front end portion. The third group lens L3 ′ is fitted and fixed to the rear end portion of the inner peripheral surface of 25. Further, three screw holes (holes) 28 are formed as through holes in the intermediate diameter portion 27 of the second lens support frame 25 at equal angular intervals in the circumferential direction. This screw hole 28 is for allowing a bolt (not shown) to pass therethrough, and fixing the second lens support frame 25 to a fixing member (not shown) inside the lens barrel 20 using the bolt. Instead of the screw hole 28, a simple through hole (hole) may be formed, and the second lens support frame 25 may be fixed to the fixing member by a pin passing through the through hole.
The inner peripheral surface of the intermediate diameter portion 27 and the front surface of the annular wall portion 30 that connects the intermediate diameter portion 27 and the minimum diameter portion 29 and is orthogonal to the optical axis O are reflected in the same manner as the lens barrel 10. An anti-reflection surface is formed (however, no anti-reflection surface is formed on the peripheral surface of the screw hole 28 or the through hole). Further, an antireflection surface is formed on the front surface and the inner peripheral surface of the inner flange 31 formed at the rear end of the second lens support frame 25 in the same manner as the lens barrel 10.

本実施形態によっても第1の実施形態と同様の効果が得られる。
さらに、第1レンズ支持枠21の内周ガイド面22及び移動レンズ枠24の外周面には反射防止面を形成していないので、第1レンズ支持枠21に対して移動レンズ枠24を円滑にスライドさせることが可能である。また、ねじ穴28(または上記貫通穴)の周面にも反射防止面を形成していないので、ボルトやピンをこれらの穴に挿入しても、反射防止面の微小突起がボルトやピンと擦れることによって当該穴から剥がれ落ちることはない。
According to this embodiment, the same effect as that of the first embodiment can be obtained.
Furthermore, since the antireflection surface is not formed on the inner peripheral guide surface 22 of the first lens support frame 21 and the outer peripheral surface of the movable lens frame 24, the movable lens frame 24 can be smoothly moved with respect to the first lens support frame 21. It is possible to slide. Further, since the antireflection surface is not formed on the peripheral surface of the screw hole 28 (or the through hole), even if a bolt or a pin is inserted into these holes, the minute protrusions on the antireflection surface rub against the bolt or the pin. It will not come off from the hole.

以下、図6及び7を用いて、本発明による鏡枠部材の表面加工方法について具体的に説明する。図6及び7は、図1及び5と比較して、内方フランジ12が図示されていない等、各部材の形状が異なっているが、基本的な概念は同じである。すなわち、図6及び7は、レンズ鏡筒(鏡枠部材)50の表面に反射防止面80を形成する工程を示す図である。   Hereinafter, the surface processing method of the lens barrel member according to the present invention will be specifically described with reference to FIGS. 6 and 7 are different from FIGS. 1 and 5 in that the shape of each member is different, for example, the inner flange 12 is not shown, but the basic concept is the same. That is, FIGS. 6 and 7 are diagrams showing a process of forming the antireflection surface 80 on the surface of the lens barrel (lens frame member) 50.

1.削り出し及び黒アルマイト処理工程
まず、図6(A)のように構成されたレンズ鏡筒50を準備する。レンズ鏡筒50は、例えば削り出しにより作製することができる。レンズ鏡筒50は、レンズL4、L5(又はそのレンズ枠)が嵌合される内円筒面51を有し、この内円筒面51は、光軸方向に位置を異ならせた光軸中心の円筒面からなる大径筒部52及び小径筒部53と、この大径筒部52と小径筒部53の間に形成された光軸直交面54とから構成されている。また、レンズ鏡筒50の表面(内円筒面51)には、黒アルマイト処理を施す。
1. Cutting and Black Alumite Processing Step First, a lens barrel 50 configured as shown in FIG. 6A is prepared. The lens barrel 50 can be manufactured by cutting, for example. The lens barrel 50 has an inner cylindrical surface 51 into which the lenses L4 and L5 (or its lens frame) are fitted, and the inner cylindrical surface 51 is a cylinder having a center in the optical axis whose positions are different in the optical axis direction. A large-diameter cylindrical portion 52 and a small-diameter cylindrical portion 53 formed from surfaces, and an optical axis orthogonal surface 54 formed between the large-diameter cylindrical portion 52 and the small-diameter cylindrical portion 53. Further, the surface of the lens barrel 50 (inner cylindrical surface 51) is subjected to black alumite treatment.

2.マスキング処理工程
次いで、レンズ鏡筒50の表面のうち、反射防止面80の形成面以外の面にマスキング60を施す。すなわち、レンズ鏡筒50の前方端面55、後方端面56及び外円筒面57の全面と、レンズ鏡筒50の内円筒面51のうち、レンズL4の外周円筒面との嵌合面52A、レンズL5の外周円筒面との嵌合面53Aにマスキング60を施す(図6(B))。このマスキング処理は、例えば、マスキングシール(マスキングテープ)により行う。
2. Masking Process Step Next, masking 60 is applied to the surface of the lens barrel 50 other than the surface on which the antireflection surface 80 is formed. That is, a fitting surface 52A between the entire front end surface 55, rear end surface 56 and outer cylindrical surface 57 of the lens barrel 50 and the outer cylindrical surface of the lens L4 among the inner cylindrical surface 51 of the lens barrel 50, and the lens L5. Masking 60 is applied to the fitting surface 53A with the outer peripheral cylindrical surface (FIG. 6B). This masking process is performed by, for example, a masking seal (masking tape).

3.めっき処理工程
次いで、レンズ鏡筒50の表面のマスキング60を施していない部分、すなわち内円筒面51のうち嵌合面52A及び53Aを除く表面に、ニッケルめっき処理又はニッケル合金めっき処理を施して、めっき層70を形成する(図6(C))。このめっき層70の厚みは3〜90μmであり、反射防止面80をなす微小突起の高さ(0.5〜5μm)の6倍〜18倍である。このめっき処理は、例えば、めっき浸漬により行う。
3. Plating treatment step Next, the portion of the lens barrel 50 that has not been subjected to masking 60, that is, the inner cylindrical surface 51 other than the fitting surfaces 52A and 53A, is subjected to nickel plating treatment or nickel alloy plating treatment, A plating layer 70 is formed (FIG. 6C). The thickness of the plating layer 70 is 3 to 90 μm, and is 6 to 18 times the height of the minute protrusion (0.5 to 5 μm) forming the antireflection surface 80. This plating process is performed by plating immersion, for example.

4.エッチング工程
次いで、レンズ鏡筒50にエッチング処理を施す。これにより、レンズ鏡筒50の内円筒面51に形成されためっき層70が、高さが0.5〜5μmかつピッチが0.1〜10μmである多数の微小突起をランダムに形成した反射防止面80となる(図6(D))。このエッチング処理は、例えば、硝酸エッチングにより行う。
4). Etching Step Next, the lens barrel 50 is etched. As a result, the plating layer 70 formed on the inner cylindrical surface 51 of the lens barrel 50 has a number of minute projections randomly formed with a height of 0.5 to 5 μm and a pitch of 0.1 to 10 μm. It becomes the surface 80 (FIG. 6D). This etching process is performed by nitric acid etching, for example.

5.マスキング除去工程
最後に、レンズ鏡筒50の表面に施したマスキング60を除去する。これにより、レンズ鏡筒50の内円筒面51のうち、嵌合面52A及び53Aを除く表面に、反射防止面80を形成することができる(図6(E))。そして、嵌合面52AにはレンズL4の外周円筒面を嵌め込み、嵌合面53AにはレンズL5の外周円筒面を嵌め込むことができる(図6(F))。
5. Masking Removal Process Finally, the masking 60 applied to the surface of the lens barrel 50 is removed. Thereby, the antireflection surface 80 can be formed on the surface of the inner cylindrical surface 51 of the lens barrel 50 excluding the fitting surfaces 52A and 53A (FIG. 6E). Then, the outer peripheral cylindrical surface of the lens L4 can be fitted into the fitting surface 52A, and the outer peripheral cylindrical surface of the lens L5 can be fitted into the fitting surface 53A (FIG. 6F).

なお、図6(D)のエッチング工程を省略して、レンズ鏡筒50の表面に反射防止面80を形成することも可能である。すなわち、レンズ鏡筒50のマスキング60を施していない他の部分に、ニッケルめっき処理又はニッケル合金めっき処理を施すだけで、高さが0.5〜5μmかつピッチが0.1〜10μmである多数の微小突起をランダムに形成した反射防止面80を形成することができる。   It is also possible to omit the etching step of FIG. 6D and form the antireflection surface 80 on the surface of the lens barrel 50. That is, a large number having a height of 0.5 to 5 [mu] m and a pitch of 0.1 to 10 [mu] m can be obtained by simply performing nickel plating or nickel alloy plating on other portions of the lens barrel 50 that are not masked 60. It is possible to form the antireflection surface 80 in which the minute protrusions are randomly formed.

図7は、図6のエッチング工程(第4工程)とマスキング除去工程(第5工程)の順番を入れ替えた加工方法である。図7(A)−(C)、(F)の工程は、図6(A)−(C)、(F)と同一であるため、その説明を省略する。   FIG. 7 shows a processing method in which the order of the etching step (fourth step) and the masking removal step (fifth step) in FIG. 6 are interchanged. 7A to 7C are the same as those in FIGS. 6A to 6C, and the description thereof is omitted.

図7の加工方法は、レンズ鏡筒50が、アルミニウム、ステンレス、チタン、タンタル及びマグネシウムのいずれかの金属材料またはこれらの合金からなる場合に好適な加工方法である。アルミニウム及びステンレスは、酸化皮膜又は不動態皮膜を有する材料である。また、アルミニウム、チタン、タンタル及びマグネシウムは、陽極酸化で緻密な酸化物層のできるバルブ金属である。   The processing method of FIG. 7 is a preferable processing method when the lens barrel 50 is made of any metal material of aluminum, stainless steel, titanium, tantalum, and magnesium, or an alloy thereof. Aluminum and stainless steel are materials having an oxide film or a passive film. Aluminum, titanium, tantalum and magnesium are valve metals capable of forming a dense oxide layer by anodic oxidation.

レンズ鏡筒50の表面には、レンズ鏡筒50の削り出し後に、酸化皮膜処理又は不動態皮膜処理が施されている。「酸化皮膜」とは、金属が酸化してできた酸化物の皮膜であり、「不動態皮膜」とは、使用する環境中において金属が金属表面に薄い膜を作り、その膜が環境と金属を隔て、耐食性を発現する薄い膜である。「酸化皮膜処理」とは、レンズ鏡筒50の表面に酸化皮膜を形成する処理であり、具体的には、陽極酸化することにより行なわれる。「不動態化処理」とは、レンズ鏡筒50の表面に不動態皮膜を形成する処理であり、具体的には、不動態皮膜が形成するpHの薬液などに浸漬することにより行なわれる。   The surface of the lens barrel 50 is subjected to an oxide film treatment or a passive film treatment after the lens barrel 50 is cut out. “Oxide film” is an oxide film formed by oxidation of metal, and “passive film” is a film in which the metal forms a thin film on the metal surface in the environment in which it is used. It is a thin film that develops corrosion resistance. The “oxide film treatment” is a process for forming an oxide film on the surface of the lens barrel 50, and specifically, is performed by anodizing. The “passivation process” is a process of forming a passive film on the surface of the lens barrel 50, and specifically, is performed by immersing in a chemical solution having a pH formed by the passive film.

レンズ鏡筒50が以上の構成を有していることにより、レンズ鏡筒50からマスキング60を除去した後にエッチングを施しても(図7(D)、(E))、酸化皮膜又は不動態皮膜(緻密な酸化物層)の作用によって、レンズ鏡筒50の、マスキング60を除去した表面がエッチング液によって侵食されることはない。
また、マスキング60を除去した後にエッチングにより反射防止面80を形成するので(図7(D)、(E))、マスキング60を除去するときに反射防止面80の微小突起に触れること、又は反射防止面80の微小突起を一緒に剥がすことはなく、反射防止面80の微細構造が破壊されることはない。反射防止面80の微細構造が破壊されるとその破壊部分が逆に光り、反射防止面としての機能が低下するが、本加工方法によればそのような弊害を防止することができる。本加工方法は、レンズ鏡筒50の内円筒面51のような狭い箇所に反射防止面80を形成する場合には特に優位である。
さらに、内円筒面51の嵌合面52A及び53Aには反射防止面80が形成されないので、嵌合面52A及び53Aの寸法精度が高く、レンズL4、L5との嵌合を良好にすることができる。
Since the lens barrel 50 has the above configuration, even if etching is performed after removing the masking 60 from the lens barrel 50 (FIGS. 7D and 7E), an oxide film or a passive film is formed. By the action of the (dense oxide layer), the surface of the lens barrel 50 from which the masking 60 has been removed is not eroded by the etching solution.
Further, since the antireflection surface 80 is formed by etching after removing the masking 60 (FIGS. 7D and 7E), when removing the masking 60, the microprojections on the antireflection surface 80 are touched or reflected. The minute protrusions on the prevention surface 80 are not peeled off together, and the microstructure of the reflection prevention surface 80 is not destroyed. When the fine structure of the antireflection surface 80 is destroyed, the destroyed portion shines in reverse, and the function as the antireflection surface is lowered. However, according to the present processing method, such an adverse effect can be prevented. This processing method is particularly advantageous when the antireflection surface 80 is formed in a narrow place such as the inner cylindrical surface 51 of the lens barrel 50.
Further, since the antireflection surface 80 is not formed on the fitting surfaces 52A and 53A of the inner cylindrical surface 51, the dimensional accuracy of the fitting surfaces 52A and 53A is high, and the fitting with the lenses L4 and L5 can be improved. it can.

なお、上記実施形態ではレンズ支持枠11、21の内周面と、押さえ環15、間隔環16及び押さえ環17の外周面とにシールを貼ることにより、シールを貼った部分にニッケルめっき処理を施さない(反射防止面を形成しない)ようにしているが、シールを貼らずに、レンズ支持枠11、21、押さえ環15、間隔環16及び押さえ環17の表面全体にニッケルめっき処理を施し、その後にレンズ支持枠11、21の内周面における内方フランジ12の内周面を除く部分のニッケルめっきと、押さえ環15の外周面及び後面のニッケルめっきと、間隔環16の外周面及び前後両面のニッケルめっきと、押さえ環17の外周面及び前面のニッケルめっきを塩化第二鉄(塩化鉄(III))を含有する溶剤を利用して削りとってもよい。このようにしても、これらの領域の微小突起をその他の領域の微小突起より低くしたり、微小突起を完全に無くすことが可能である。
また、反射防止面を形成する鏡枠部材はレンズ支持枠11、21、押さえ環15、間隔環16及び押さえ環17には限定されず、あらゆる鏡枠部材に適用することができる。例えば、レンズ鏡筒(交換式のものでなくてもよい)の光路が通過する部材であればいずれにも適用可能であるし、レンズ鏡筒でなくとも、カメラボディ内において光路が通過する周囲の壁面、例えばミラーボックス内の壁面や、ファインダー光路の壁面にも応用可能であることは言うまでもない。
さらに、鏡枠部材における反射防止面を形成しない領域、つまりニッケルめっきを施さない(或いはニッケルめっきを削り取る)領域は上記の部分には限定されず、隣接する部材と接触する部分であればどの部分であってもよく、例えば当該領域を、光軸方向に相対スライド可能な2つのレンズ鏡枠の接触部や、レンズ鏡筒を光軸方向に進退させるためのカム溝と該カム溝に嵌るカムフォロアの接触面などにしてもよい。また、間隔環16の内周面のみに反射防止面を形成したり、押さえ環15と押さえ環17の内周面のみに反射防止面を形成してもよい。さらに、例えば押さえ環15の前面や押さえ環17の後面のように、他の部材と接触しない部分のうち光路(光軸O)と対向しない箇所については反射防止面を形成しないようにしてもよい。
なお、反射防止面を形成した(ニッケルめっきを施した)場合であっても鏡枠部材を隣接する部材に対して円滑かつ精度よく組み付けられるのであれば、鏡枠部材の表面全体にニッケルめっきを施して反射防止面を形成してもよい(反射防止面の形成後に微小突起の一部を取り除く必要がない)。
In the above embodiment, a seal is applied to the inner peripheral surfaces of the lens support frames 11 and 21 and the outer peripheral surfaces of the presser ring 15, the spacing ring 16, and the presser ring 17, so that a nickel plating process is performed on the part where the seal is applied. Although it does not give (does not form an anti-reflective surface), without attaching a seal, the entire surface of the lens support frames 11 and 21, the holding ring 15, the spacing ring 16 and the holding ring 17 is subjected to nickel plating, Thereafter, the nickel plating on the inner peripheral surfaces of the lens support frames 11 and 21 excluding the inner peripheral surface of the inner flange 12, the nickel plating on the outer peripheral surface and the rear surface of the pressing ring 15, the outer peripheral surface of the spacing ring 16, and the front and rear The nickel plating on both surfaces and the nickel plating on the outer peripheral surface and front surface of the pressing ring 17 may be scraped using a solvent containing ferric chloride (iron (III) chloride). Even in this case, the microprotrusions in these regions can be made lower than the microprotrusions in other regions, or the microprotrusions can be completely eliminated.
Further, the lens frame member forming the antireflection surface is not limited to the lens support frames 11 and 21, the pressing ring 15, the spacing ring 16, and the pressing ring 17, and can be applied to any lens frame member. For example, any member that can pass through the optical path of a lens barrel (not necessarily interchangeable) can be applied to any member. Needless to say, the present invention can also be applied to a wall surface of a mirror, for example, a wall surface in a mirror box or a wall surface of a finder optical path.
Further, the region of the lens frame member where the antireflection surface is not formed, that is, the region where nickel plating is not performed (or the nickel plating is scraped off) is not limited to the above portion, and any portion that is in contact with an adjacent member For example, the region may be a contact portion between two lens barrels that can slide relative to each other in the optical axis direction, a cam groove for moving the lens barrel forward and backward in the optical axis direction, and a cam follower that fits in the cam groove. It may be a contact surface. Further, an antireflection surface may be formed only on the inner peripheral surface of the spacing ring 16, or an antireflection surface may be formed only on the inner peripheral surfaces of the presser ring 15 and the presser ring 17. Further, for example, an antireflection surface may not be formed at a portion that does not face the optical path (optical axis O) among portions that do not contact other members, such as the front surface of the pressing ring 15 or the rear surface of the pressing ring 17. .
Even if the antireflection surface is formed (nickel plating is applied), if the lens frame member can be smoothly and accurately assembled to the adjacent members, the entire surface of the lens frame member is plated with nickel. May be applied to form an antireflection surface (there is no need to remove a part of the minute protrusions after the formation of the antireflection surface).

10 レンズ鏡筒
11 レンズ支持枠(鏡枠部材)
11a 11b 雌ねじ(ねじ部)
12 内方フランジ
15 押さえ環(鏡枠部材)
15a 雄ねじ(ねじ部)
16 間隔環(鏡枠部材)
17 押さえ環(鏡枠部材)
17a 雄ねじ(ねじ部)
20 レンズ鏡筒
21 第1レンズ支持枠
22 内周ガイド面(ガイド部)
23 雄ねじ(ねじ部)
24 移動レンズ枠
24a 外周面(ガイド部)
25 第2レンズ支持枠
26 雌ねじ(ねじ部)
27 中間径部
28 ねじ穴(穴部)
29 最小径部
30 環状壁部
31 内方フランジ
50 レンズ鏡筒(鏡枠部材)
51 内円筒面
52 大径筒部
52A 嵌合面
53 小径筒部
53A 嵌合面
54 光軸直交面
55 前方端面
56 後方端面
57 外円筒面
60 マスキング
70 めっき層
80 反射防止面(微小突起形成面)
L1 1群レンズ(光学系)
L2 L2’ 2群レンズ(光学系)
L3 L3’ 3群レンズ(光学系)
L4 レンズ(レンズ枠)
L5 レンズ(レンズ枠)
10 Lens barrel 11 Lens support frame (lens frame member)
11a 11b Female thread (thread part)
12 Inner flange 15 Retaining ring (mirror frame member)
15a Male thread (thread part)
16 Spacing ring (mirror frame member)
17 Retaining ring (mirror frame member)
17a Male thread (threaded part)
20 Lens barrel 21 First lens support frame 22 Inner peripheral guide surface (guide portion)
23 Male thread (thread)
24 Moving lens frame 24a Outer peripheral surface (guide portion)
25 Second lens support frame 26 Female thread (threaded part)
27 Intermediate Diameter 28 Screw Hole (Hole)
29 Minimum diameter portion 30 Annular wall portion 31 Inner flange 50 Lens barrel (lens frame member)
51 Inner cylindrical surface 52 Large diameter cylindrical portion 52A Fitting surface 53 Small diameter cylindrical portion 53A Fitting surface 54 Optical axis orthogonal surface 55 Front end surface 56 Rear end surface 57 Outer cylindrical surface 60 Masking 70 Plating layer 80 Antireflection surface (microprojection forming surface) )
L1 1 group lens (optical system)
L2 L2 '2 group lens (optical system)
L3 L3 '3 group lens (optical system)
L4 lens (lens frame)
L5 lens (lens frame)

Claims (3)

アルミニウム又はステンレスからなる鏡枠部材の表面に反射防止面を形成する鏡枠部材の表面加工方法であって、A surface processing method for a lens frame member that forms an antireflection surface on the surface of a lens frame member made of aluminum or stainless steel,
アルミニウム又はステンレスからなる上記鏡枠部材の表面に、酸化皮膜処理又は不動態皮膜処理を施すステップ;Performing an oxide film treatment or a passive film treatment on the surface of the lens frame member made of aluminum or stainless steel;
酸化皮膜処理又は不動態皮膜処理を施した上記鏡枠部材の表面のうち、反射防止面形成面以外の面にマスキングを施すステップ;Masking a surface other than the antireflection surface forming surface among the surfaces of the lens frame member subjected to the oxide film treatment or the passive film treatment;
酸化皮膜処理又は不動態皮膜処理を施した上記鏡枠部材の表面のうち、マスキングを施していない上記反射防止面形成面に、ニッケルめっき処理又はニッケル合金めっき処理を施すステップ;A step of performing nickel plating treatment or nickel alloy plating treatment on the antireflection surface forming surface not subjected to masking among the surfaces of the lens frame member subjected to the oxide film treatment or the passive film treatment;
上記マスキングを除去するステップ;及びRemoving the masking; and
マスキングを除去した上記鏡枠部材にエッチング処理を施して、上記鏡枠部材のニッケルめっき処理又はニッケル合金めっき処理を施した上記反射防止面形成面に、高さが0.5〜5μmかつピッチが0.1〜10μmである多数の微小突起をランダムに形成した反射防止面を形成するステップ;を有することを特徴とする鏡枠部材の表面加工方法。The lens frame member from which the masking has been removed is subjected to an etching process, and the antireflection surface forming surface on which the nickel frame treatment or the nickel alloy plating process is performed on the lens frame member has a height of 0.5 to 5 μm and a pitch. A method of processing a surface of a lens frame member, comprising: forming an antireflection surface on which a large number of microprojections having a size of 0.1 to 10 μm are randomly formed.
請求項1記載の鏡枠部材の表面加工方法において、In the surface processing method of the lens barrel member according to claim 1,
上記鏡枠部材は、レンズ又はレンズ枠が嵌合される内円筒面を有し、上記微小突起は、この鏡枠部材の内円筒面のうち、レンズ又はレンズ枠との嵌合面を除く表面に形成される鏡枠部材の表面加工方法。The lens frame member has an inner cylindrical surface to which the lens or the lens frame is fitted, and the minute protrusion is a surface of the inner cylindrical surface of the lens frame member excluding the lens or the lens frame fitting surface. The surface processing method of the lens-frame member formed in this.
請求項1または2記載の鏡枠部材の表面加工方法において、In the surface processing method of the lens-frame member of Claim 1 or 2,
上記鏡枠部材は、その表面に、上記酸化皮膜処理又は不動態皮膜処理とは別に、黒アルマイト処理が施されている鏡枠部材の表面加工方法。The lens frame member is a surface processing method for a lens frame member, the surface of which is subjected to black alumite treatment separately from the oxide film treatment or the passive film treatment.
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