JP6051785B2 - Drip-proof structure of lens barrel - Google Patents

Drip-proof structure of lens barrel Download PDF

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JP6051785B2
JP6051785B2 JP2012242383A JP2012242383A JP6051785B2 JP 6051785 B2 JP6051785 B2 JP 6051785B2 JP 2012242383 A JP2012242383 A JP 2012242383A JP 2012242383 A JP2012242383 A JP 2012242383A JP 6051785 B2 JP6051785 B2 JP 6051785B2
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drip
proof
annular
layer
lens barrel
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JP2014092644A (en
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啓行 大荒
啓行 大荒
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Ricoh Imaging Co Ltd
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Ricoh Imaging Co Ltd
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Description

本発明は、レンズ鏡筒の防滴構造に関する。   The present invention relates to a drip-proof structure for a lens barrel.

レンズ鏡筒では、同軸をなし相対移動する内外の環状部材が広く用いられている。この内外の環状部材の環状隙間からの雨滴の浸入を防止し、適度な操作抵抗（操作感）を与えるため、該内外の環状部材のいずれか一方の周面に、環状防滴帯材（ストリップ）の内外の一方の面を接着し、他方の周面に、環状防滴帯材の内外の他方の面を接触させることが行われている。特許文献１は、この環状防滴帯材として、合成皮革を用いることを提案している。   In lens barrels, inner and outer annular members that are coaxial and relatively move are widely used. In order to prevent raindrops from entering through the annular gap between the inner and outer annular members and to provide appropriate operating resistance (operation feeling), an annular drip-proof strip (strip) is provided on one of the peripheral surfaces of the inner and outer annular members. ) And the other surface of the annular drip-proof band material are brought into contact with the other peripheral surface. Patent Document 1 proposes to use synthetic leather as the annular drip-proof material.

特開２００８-２０３７７３号公報JP 2008-203773 A

特許文献１のレンズ鏡筒の防滴構造は、小型のレンズ鏡筒では、防滴性と適度な操作抵抗を与えることができた。ところが、大径のレンズ鏡筒は、内外の環状部材の真円度の差（径方向隙間の周方向変化）により、あるいは環状部材の表面に施した凹凸のできる化粧塗装（チリメン塗装など）、または乾燥する際に熱収縮で凹凸のできる塗装により、防滴構造を構成する内外の環状部材の隙間の寸法管理が困難なため、隙間のばらつきが大きくなってしまい、好適な防滴性と操作感が低下するという問題があった。小型のレンズ鏡筒であっても、防滴構造を構成する内外の環状部材の隙間の精度が低い場合、凹凸のできる塗装を施した場合には同様の問題があった。   The drip-proof structure of the lens barrel of Patent Document 1 was able to provide drip-proof properties and appropriate operating resistance with a small lens barrel. However, a large-diameter lens barrel is a cosmetic coating (such as a chirimene coating) that can be formed on the surface of the annular member by the difference in roundness between the inner and outer annular members (a change in the circumferential direction of the radial gap) or on the surface of the annular member. Or, when drying, it is difficult to control the size of the gap between the inner and outer annular members that make up the drip-proof structure due to the coating that can be uneven by heat shrinkage, resulting in a large gap variation and suitable drip-proof performance and operation There was a problem that the feeling decreased. Even in the case of a small lens barrel, there is a similar problem in the case where the accuracy of the gap between the inner and outer annular members constituting the drip-proof structure is low, or when coating with unevenness is applied.

本発明は、以上の問題意識に基づき、内外の環状部材の径方向隙間や真円度の差（径方向隙間の周方向変化）が比較的大きくなり、あるいは表面に比較的大きな凹凸があった場合にも、好適な防滴性と操作感が得られるレンズ鏡筒の防滴構造を得ることを目的とする。   In the present invention, on the basis of the above problem awareness, the radial gap and roundness difference (circumferential change in the radial gap) between the inner and outer annular members are relatively large, or there are relatively large irregularities on the surface. Even in such a case, an object is to obtain a drip-proof structure of a lens barrel that can provide suitable drip-proof properties and operational feeling.

本発明は、環状防滴帯材の径方向への移動柔軟性を高めるため、防滴層に、該防滴層よりも低反発性の弾性変形層を重ねて（積層して）設けるという着眼に基づいてなされたものである。 The present invention focuses on providing an elastic deformation layer having a lower repulsion property than the drip-proof layer on the drip-proof layer so as to increase flexibility in moving the annular drip-proof band in the radial direction. It was made based on.

すなわち、本発明のレンズ鏡筒の防滴構造は、同軸をなし相対移動可能な内外の環状部材を備え、上記内外の環状部材のいずれか一方の周面に、環状防滴帯材の内外の一方の面を接着し、他方の周面に、環状防滴帯材の内外の他方の面を接触させたレンズ鏡筒の防滴構造において、環状防滴帯材は、防滴層と、該防滴層より低反発性の弾性変形層との積層構造からなり、該弾性変形層が上記内外の環状部材の周面の一方に接着され、該防滴層が上記内外の環状部材の周面の他方に接触することを特徴としている。   That is, the drip-proof structure of the lens barrel of the present invention includes an inner and outer annular members that are coaxial and can be moved relative to each other. In the drip-proof structure of the lens barrel in which one surface is bonded and the other peripheral surface is in contact with the other surface inside and outside the annular drip-proof material, the annular drip-proof material includes a drip-proof layer, It has a laminated structure with an elastically deformable layer having a lower rebound than the drip-proof layer, the elastically deformable layer is bonded to one of the peripheral surfaces of the inner and outer annular members, and the drip-proof layer is a peripheral surface of the inner and outer annular members It touches the other of these.

環状防滴帯材を接着する側の環状部材には、該環状防滴帯材を収納する環状溝を形成し、防滴層は該環状溝から径方向外方に突出させ、防滴層以外の層は、該環状溝内に位置させることが好ましい。   An annular groove for housing the annular drip-proof band material is formed in the annular member on the side to which the annular drip-proof band material is bonded, and the drip-proof layer protrudes radially outward from the annular groove, and other than the drip-proof layer The layer is preferably located in the annular groove.

弾性変形層は、具体的には、ポリエチレン樹脂、ポリウレタン樹脂、ポロン樹脂のいずれかから構成することが好ましい。   Specifically, the elastic deformation layer is preferably composed of any one of polyethylene resin, polyurethane resin, and poron resin.

防滴層は、その環状部材との接触面に予め起毛処理を施しておくことが好ましい。   The drip-proof layer is preferably subjected to a raising treatment in advance on the contact surface with the annular member.

環状防滴帯材には、さらに、防滴層より弾性変形層側に位置させて、該弾性変形層より低伸縮性で薄肉の伸縮抑制層を含ませることができる。   The annular drip-proof band material may further include a thin expansion / contraction suppression layer that is positioned closer to the elastic deformation layer than the drip-proof layer and has a lower elasticity and a thinner wall than the elastic deformation layer.

伸縮抑制層は、配置する場合、ペット樹脂、ＰＣ、ポリプロピレン、樹脂シート材、樹脂フィルム材のいずれかから構成することができるが、特にＰＣ、ポリプロピレンが好ましい。   When the expansion / contraction suppression layer is arranged, it can be composed of any of PET resin, PC, polypropylene, a resin sheet material, and a resin film material, and PC and polypropylene are particularly preferable.

本発明は、同軸をなし相対移動可能な内外の環状部材の隙間に環状防滴帯材を介在させたレンズ鏡筒の防滴構造において、環状防滴帯材を、防滴層と、該防滴層より低反発性の弾性変形層との積層構造とし、該弾性変形層を内外の環状部材の周面の一方に接着し、該防滴層を内外の環状部材の周面の他方に接触させたので、弾性変形層の径方向の弾性変形性により、内外の環状部材の径方向隙間や真円度の差（径方向隙間の周方向変化）が比較的大きくなり、あるいは表面に比較的大きな凹凸があった場合にも、好適な防滴性と操作感を得ることができる。   The present invention relates to a drip-proof structure of a lens barrel in which an annular drip-proof band material is interposed in a gap between inner and outer annular members that are coaxial and relatively movable, and the drip-proof band material, the drip-proof layer, and the drip-proof layer. It has a laminated structure with an elastic deformation layer that is less repulsive than the droplet layer, the elastic deformation layer is bonded to one of the peripheral surfaces of the inner and outer annular members, and the drip-proof layer is in contact with the other peripheral surface of the inner and outer annular members As a result, due to the elastic deformation of the elastic deformation layer in the radial direction, the difference in the radial gap and roundness of the inner and outer annular members (change in the circumferential direction of the radial gap) is relatively large, or the surface is relatively Even when there are large irregularities, suitable drip-proof property and operational feeling can be obtained.

本発明の防滴構造を適用したレンズ鏡筒の一実施形態を示す上半部の縦断側面図である。It is a vertical side view of the upper half part which shows one Embodiment of the lens-barrel to which the drip-proof structure of this invention is applied. 図１のII部拡大断面図である。It is the II section expanded sectional view of FIG. 図１、図２の環状防滴帯材単体の環状状態の斜視図である。It is a perspective view of the cyclic | annular state of the cyclic | annular drip-proof band material simple substance of FIG. 本発明の防滴構造の他の実施形態を示す、図２に対応する断面図である。It is sectional drawing corresponding to FIG. 2 which shows other embodiment of the drip-proof structure of this invention. 本発明の他の実施形態を示す環状防滴帯材単体の断面図である。It is sectional drawing of the cyclic | annular drip-proof band material single-piece | unit which shows other embodiment of this invention. 環状防滴帯材の変形例の部分拡大平面図である。It is the elements on larger scale of the modification of an annular drip-proof belt material. 環状防滴帯材の別の変形例の図６と同様の部分拡大図である。It is the elements on larger scale similar to FIG. 6 of another modification of an annular drip-proof band material. 環状防滴帯材のさらに別の変形例の図６と同様の部分拡大図である。It is the elements on larger scale similar to FIG. 6 of another modification of an annular drip-proof band material. 環状防滴帯材のさらに別の変形例の図６と同様の部分拡大図である。It is the elements on larger scale similar to FIG. 6 of another modification of an annular drip-proof band material. 環状防滴帯材のさらに別の変形例の図６と同様の部分拡大図である。It is the elements on larger scale similar to FIG. 6 of another modification of an annular drip-proof band material.

図１は、本発明の防滴構造を適用したレンズ鏡筒１０を示している。このレンズ鏡筒１０は、光軸Ｏを中心とする同軸の内側環状部材１１と外側環状部材１２を有している。内側環状部材１１は、第１レンズ群Ｌ１を固定して光軸方向に直進移動する部材であり、外側環状部材１２は、内側環状部材１１の外周を回転操作可能な回転部材（例えばフォーカス環）である。図２に明らかなように、内側環状部材１１の外周面と外側環状部材１２の内周面の間には、これらが接触していると内側環状部材１１の外周面の塗膜に傷がつくので、環状空間（隙間）１３を存在させてある。本実施形態の防滴構造は、内側環状部材１１の外周面と外側環状部材１２の内周面の間に設けられている。本実施形態は、内側環状部材１１の外径が６５ｍｍ〜（環状空間１３の隙間が０．１５〜０．３ｍｍ）程度の大型（大径）レンズ鏡筒を対象としているが、本発明はこれより小型（小径）のレンズ鏡筒にも適用できる。   FIG. 1 shows a lens barrel 10 to which the drip-proof structure of the present invention is applied. The lens barrel 10 includes a coaxial inner annular member 11 and an outer annular member 12 centering on the optical axis O. The inner annular member 11 is a member that fixes the first lens unit L1 and moves linearly in the optical axis direction, and the outer annular member 12 is a rotating member that can rotate the outer periphery of the inner annular member 11 (for example, a focus ring). It is. As apparent from FIG. 2, the coating on the outer peripheral surface of the inner annular member 11 is damaged if they are in contact between the outer peripheral surface of the inner annular member 11 and the inner peripheral surface of the outer annular member 12. Therefore, an annular space (gap) 13 is present. The drip-proof structure of the present embodiment is provided between the outer peripheral surface of the inner annular member 11 and the inner peripheral surface of the outer annular member 12. The present embodiment is intended for a large (large diameter) lens barrel having an outer diameter of the inner annular member 11 of about 65 mm (a gap between the annular spaces 13 is 0.15 to 0.3 mm). The present invention can also be applied to a smaller (small diameter) lens barrel.

外側環状部材１２の内周面には、光軸直交面内に位置する環状溝（内方開放環状溝）１４が形成されており、この環状溝１４内に、環状防滴帯材（ストリップ）２０が位置している。この環状防滴帯材２０は、内側環状部材１１の外周面に接触する不透光性の合成皮革からなる防滴層２１と、環状溝１４の底面（外側環状部材１２の内周面）に接着される弾性変形層（フィルム）２２とを有している。防滴層２１と弾性変形層２２も図示しない接着剤層によって接着されており、弾性変形層２２は接着剤層２３によって環状溝１４の底面に接着されている。弾性変形層２２は、防滴層２１よりも低反発性の材料、すなわち圧縮力を加えたときの復元力が防滴層２１よりも弱い材料から形成されており、その復元力（弾性変形性）によって、環状空間１３の隙間の大小あるいは周方向のばらつきに対応して、防滴層２１を内側環状部材１１の外周面に接触（弾接）させる。   On the inner peripheral surface of the outer annular member 12, an annular groove (inwardly open annular groove) 14 located in the plane orthogonal to the optical axis is formed, and in this annular groove 14, an annular drip-proof band material (strip). 20 is located. The annular drip-proof band member 20 is formed on the drip-proof layer 21 made of a light-transmitting synthetic leather that contacts the outer circumferential surface of the inner annular member 11 and the bottom surface of the annular groove 14 (the inner circumferential surface of the outer annular member 12). It has an elastically deformable layer (film) 22 to be bonded. The drip-proof layer 21 and the elastic deformation layer 22 are also bonded by an adhesive layer (not shown), and the elastic deformation layer 22 is bonded to the bottom surface of the annular groove 14 by the adhesive layer 23. The elastic deformation layer 22 is formed of a material having a lower resilience than the drip-proof layer 21, that is, a material having a restoring force weaker than that of the drip-proof layer 21 when a compression force is applied. ), The drip-proof layer 21 is brought into contact (elastic contact) with the outer peripheral surface of the inner annular member 11 in accordance with the size of the gap of the annular space 13 or the variation in the circumferential direction.

具体的に、防滴層２１は、布状の合成皮革（織布、編布、不織布に樹脂材料を含浸加工したもの）からなるもので、その内周面に起毛処理が施されている（内周面は起毛面２１ａを構成している）。起毛処理を施す合成皮革は周知であり、その起毛部分を含む全体の厚さは、環状空間１３の隙間より厚い。また、この防滴層２１は、撥水剤（撥水溶液）に浸漬されて撥水処理が施されている。防滴層２１は、合成皮革に代えて、起毛布、植毛布などにより形成できる。   Specifically, the drip-proof layer 21 is made of cloth-like synthetic leather (woven fabric, knitted fabric, nonwoven fabric impregnated with a resin material), and the inner peripheral surface thereof is subjected to raising treatment ( The inner peripheral surface constitutes a raised surface 21a). Synthetic leather subjected to raising treatment is well known, and the entire thickness including the raising portion is thicker than the gap of the annular space 13. The drip-proof layer 21 is dipped in a water repellent (water repellent) and subjected to a water repellent treatment. The drip-proof layer 21 can be formed of a raised cloth, a flocked cloth or the like instead of the synthetic leather.

弾性変形層２２は、ポリエチレン樹脂からなる。この弾性変形層２２の厚さは、環状空間１３の隙間の大小あるいは周方向のばらつきに対応して、防滴層２１を内側環状部材１１の外周面に接触（弾接）させるために重要である。弾性変形層２２の厚さは、必要な弾性変形量が得られる厚さであればよい。弾性変形層２２がポリエチレン樹脂の場合、厚さが０．３ｍｍ未満では必要な弾性変形量が得られ難いので、０．３ｍｍ以上が好ましい。
防滴層２１の厚さは環状空間１３の隙間に応じて設定され、弾性変形層２２の厚さ及び環状防滴帯材２０全体の厚さは環状空間１３の隙間及び環状溝１４の深さに応じて設定されるものである。 The elastic deformation layer 22 is made of polyethylene resin. The thickness of the elastic deformation layer 22 is important for bringing the drip-proof layer 21 into contact (elastic contact) with the outer peripheral surface of the inner annular member 11 in accordance with the size of the gap in the annular space 13 or the variation in the circumferential direction. is there. The thickness of the elastic deformation layer 22 may be a thickness that can obtain a necessary elastic deformation amount. When the elastic deformation layer 22 is made of polyethylene resin, it is difficult to obtain a necessary elastic deformation amount when the thickness is less than 0.3 mm.
The thickness of the drip-proof layer 21 is set according to the gap of the annular space 13, and the thickness of the elastic deformation layer 22 and the entire thickness of the annular drip-proof band material 20 are the depth of the annular space 13 and the depth of the annular groove 14. It is set according to.

防滴層２１と弾性変形層２２は接着剤によって接着されて布状にされ、環状溝１４の底面円周長と同じ長さの帯状（ストリップ状）に切り出される。そして、切り出した環状防滴帯材２０の両端部３３と３７が図３に示すように対向させて環状とされる。図３は環状にした環状防滴帯材２０の単体形状を示している。   The drip-proof layer 21 and the elastic deformation layer 22 are bonded to each other with an adhesive to form a cloth, and are cut into a strip shape having the same length as the circumferential length of the bottom surface of the annular groove 14. And the both ends 33 and 37 of the cut-out annular drip-proof material 20 are made to oppose as shown in FIG. FIG. 3 shows a single shape of the annular drip-proof band member 20 made into a ring.

環状防滴帯材２０の突き合わせ端部３３及び突き合わせ端部３７の構造（形状）は、特許文献１で提案されているものである。すなわち、環状防滴帯材２０の周方向の突き合わせ端部３３と３７は共に、環状防滴帯材２０の前面から後方に直線的に延びる光軸方向直線部（第一端部）３４、３８と、環状防滴帯材２０の後面から前方に直線的に延びる光軸方向直線部（第二端部）３５、３９（その前端位置は光軸方向直線部３４及び光軸方向直線部３８の後端位置と同じ）と、光軸方向直線部３４の後端と光軸方向直線部３５の前端、及び光軸方向直線部３８の後端と光軸方向直線部３９の前端をそれぞれ接続する周方向に直線的に延びる周方向直線部（連結部）３６、４０を備えている。このように互いの周方向位置が異なる光軸方向直線部３４（光軸方向直線部３８）と光軸方向直線部３５（光軸方向直線部３９）を周方向直線部３６（周方向直線部４０）によって接続した形状なので、突き合わせ端部３３と３７を環状防滴帯材２０の長手方向に直交する単純な切断面とした場合に比べて、突き合わせ端部３３と３７の切断面積は大きくなっている（切断距離が長くなっている）。   The structure (shape) of the butted end portion 33 and the butted end portion 37 of the annular drip-proof material 20 is proposed in Patent Document 1. That is, both the circumferential butting ends 33 and 37 of the annular drip-proof material 20 are linearly extending in the optical axis direction (first end portions) 34 and 38 linearly extending rearward from the front surface of the annular drip-proof material 20. And optical axis direction linear portions (second end portions) 35 and 39 extending linearly forward from the rear surface of the annular drip-proof material 20 (the front end positions thereof are the optical axis direction linear portion 34 and the optical axis direction linear portion 38). The same as the rear end position), the rear end of the optical axis direction linear portion 34 and the front end of the optical axis direction linear portion 35, and the rear end of the optical axis direction linear portion 38 and the front end of the optical axis direction linear portion 39, respectively. Circumferential linear portions (connecting portions) 36 and 40 extending linearly in the circumferential direction are provided. Thus, the optical axis direction linear part 34 (optical axis direction linear part 38) and the optical axis direction linear part 35 (optical axis direction linear part 39) are different from each other in the circumferential direction position. 40), the butt end portions 33 and 37 have a larger cutting area than the case where the butt end portions 33 and 37 are simply cut surfaces perpendicular to the longitudinal direction of the annular drip-proof band member 20. (The cutting distance is long).

環状防滴帯材２０は、環状溝１４底部に接着固定された状態では、防滴層２１が該環状溝１４から突出して環状空間１３に臨んでおり、弾性変形層２２は該環状溝１４内に位置している。防滴層２１は、光軸方向から見て、環状溝１４と環状空間１３の境目とオーバーラップしている。このように防滴層２１が環状溝１４と環状空間１３の境目をまたぐことにより、良好な防滴性能が得られる。   In the state where the annular drip-proof band 20 is bonded and fixed to the bottom of the annular groove 14, the drip-proof layer 21 protrudes from the annular groove 14 and faces the annular space 13, and the elastic deformation layer 22 is in the annular groove 14. Is located. The drip-proof layer 21 overlaps the boundary between the annular groove 14 and the annular space 13 when viewed from the optical axis direction. In this way, when the drip-proof layer 21 straddles the boundary between the annular groove 14 and the annular space 13, good drip-proof performance can be obtained.

環状防滴帯材２０の後端面と環状溝１４との間には、逃げ空間１４ａが存在している。環状防滴帯材２０は、その幅が環状溝１４の溝幅（光軸方向の長さ）と等しくてもよいが、製造誤差等によりその幅が環状溝１４の溝幅よりも広くなると、光軸方向に圧縮された状態で環状溝１４内に押し込まれることになり、変形したりいびつな凹凸を生じたりして防滴性、操作感を阻害する問題を生じることがある。そこで、図２の実施形態では、環状溝１４の溝幅を環状防滴帯材２０の幅よりも広く形成し、逃げ空間１４ａを存在させることで、以上の問題を防止した。逃げ空間１４ａは、環状空間１３側に存在させてもよい。   A clearance space 14 a exists between the rear end face of the annular drip-proof material 20 and the annular groove 14. The annular drip-proof band material 20 may have a width equal to the groove width of the annular groove 14 (length in the optical axis direction), but when the width becomes wider than the groove width of the annular groove 14 due to a manufacturing error or the like, It will be pushed into the annular groove 14 while being compressed in the direction of the optical axis, which may cause problems such as deformation and distorted irregularities that impair drip-proof properties and operational feeling. Therefore, in the embodiment of FIG. 2, the groove width of the annular groove 14 is formed wider than the width of the annular drip-proof material 20, and the escape space 14a is present to prevent the above problem. The escape space 14a may exist on the annular space 13 side.

以上の防滴構造によると、環状空間１３の周方向の隙間に若干のばらつきがあったとしても、弾性変形層２２によって防滴層２１の起毛面２１ａが内側環状部材１１の外周面に弾性的に押し付けられる。防滴層２１は、環状空間１３に臨んでいて撥水性であるため、フォーカシング操作により、内側環状部材１１に対して外側環状部材１２を相対移動（回転及び軸方向移動）しても、環状空間１３を通して内側環状部材１１と外側環状部材１２の内方に雨滴が浸入することがなく、かつ外側環状部材１２に適度な回動抵抗が与えられる。また、弾性変形層２２は環状溝１４内に位置しているため、雨滴の影響を受けるおそれが少ない。また、環状防滴帯材２０全体に撥水剤が含浸しているので、この撥水剤の働きによっても、水滴や埃等が環状空間１３からレンズ鏡筒１０の内部に浸入するのが防止されている。また、防滴層２１は不透光性であるので、迷光の進入も防止できる。
この防滴構造は、外側環状部材１２に環状溝１４を形成したので、内側環状部材１１に付着した水滴等が自重（重力）により、内側環状部材１１の下側に伝わる。下側の環状溝１４は、上側の環状溝１４とは上下逆の関係で、底が重力方向下方（地上側）に位置し、重力方向上方が開放している。したがってこの防滴構造によれば、内側環状部材１１の下側に伝わった水滴が例え防滴層２１を超えても、外側環状部材１２の下側の環状溝１４（逃げ空間１４ａ）に流入して保持（貯水）され、レンズ鏡筒内部に伝わらないので、防滴効果が高まる。 According to the above drip-proof structure, even if there is a slight variation in the circumferential gap of the annular space 13, the raised surface 21 a of the drip-proof layer 21 is elastically applied to the outer peripheral surface of the inner annular member 11 by the elastic deformation layer 22. Pressed against. Since the drip-proof layer 21 faces the annular space 13 and is water-repellent, even if the outer annular member 12 is moved relative to the inner annular member 11 by the focusing operation (rotation and axial movement), the annular space The raindrop does not enter through the inner ring member 11 and the outer ring member 12 through the inner ring member 13, and appropriate rotation resistance is given to the outer ring member 12. Moreover, since the elastic deformation layer 22 is located in the annular groove 14, there is little possibility of being affected by raindrops. Further, since the entire water-repellent material 20 is impregnated with the water repellent, the water repellent prevents the water droplets and dust from entering the lens barrel 10 from the annular space 13. Has been. Moreover, since the drip-proof layer 21 is opaque, it is possible to prevent stray light from entering.
In this drip-proof structure, since the annular groove 14 is formed in the outer annular member 12, water droplets and the like attached to the inner annular member 11 are transmitted to the lower side of the inner annular member 11 by its own weight (gravity). The lower annular groove 14 has an upside-down relationship with the upper annular groove 14, and the bottom is positioned below the gravitational direction (on the ground side) and the upper gravitational direction is open. Therefore, according to this drip-proof structure, even if water drops transmitted to the lower side of the inner annular member 11 exceed the drip-proof layer 21, they flow into the lower annular groove 14 (relief space 14a) on the lower side of the outer annular member 12. Are retained (water storage) and are not transmitted to the inside of the lens barrel, so the drip-proof effect is enhanced.

図４は、内側環状部材１１の外周面に環状溝（外方開放環状溝）１５を形成し、この環状溝１５内に、内外を図２の実施形態とは逆とした環状防滴帯材２０を接着固定した実施形態を示している。すなわち、この実施形態では、防滴層２１が外周側、弾性変形層２２が内周側に位置していて、防滴層２１が外側環状部材１２の内周面に接触する。この実施形態は、環状防滴帯材２０の後端面と環状溝１５との間に逃げ空間１５ａが存在し、光軸方向から見て、防滴層２１が環状溝１５と環状空間１３の境目とオーバーラップしている。この実施形態によれば、内側環状部材１１に環状溝１５を形成したので、弾性変形層２２が環状空間１３から出難くなった。   FIG. 4 shows an annular drip-proof band material in which an annular groove (outwardly open annular groove) 15 is formed on the outer peripheral surface of the inner annular member 11, and the inside and outside of the annular groove 15 are opposite to the embodiment of FIG. An embodiment in which 20 is bonded and fixed is shown. That is, in this embodiment, the drip-proof layer 21 is positioned on the outer peripheral side and the elastic deformation layer 22 is positioned on the inner peripheral side, and the drip-proof layer 21 contacts the inner peripheral surface of the outer annular member 12. In this embodiment, an escape space 15 a exists between the rear end surface of the annular drip-proof band member 20 and the annular groove 15, and the drip-proof layer 21 is a boundary between the annular groove 15 and the annular space 13 when viewed from the optical axis direction. And overlap. According to this embodiment, since the annular groove 15 is formed in the inner annular member 11, the elastic deformation layer 22 is difficult to come out of the annular space 13.

図５は、本発明のレンズ鏡筒の防滴構造に用いる環状防滴帯材２０Ａの別の実施形態を示している。この実施形態は、環状防滴帯材２０Ａの防滴層２１と弾性変形層２２の間に、該弾性変形層２２より低伸縮性で（伸びにくく）薄肉の伸縮抑制層（フィルム）２４を含ませた実施形態である。伸縮抑制層２４は、弾性変形層２２と接着剤層２３の間に含ませてもよい。また、弾性変形層２２より低伸縮性（伸びにくい）特性をもった接着剤により接着剤層２３を形成してもよい。伸縮抑制層２４は、ペット樹脂、ＰＣ、ポリプロピレン、樹脂シート材、樹脂フィルム材のいずれかから構成することができるが、特にＰＣ、ポリプロピレンが好ましい。その厚さは、伸縮抑制層２４の素材の伸縮性が低いほど薄くすることができる。この伸縮抑制層２４を加えると、環状防滴帯材２０Ａ全体の伸縮が抑制されるので、環状防滴帯材２０Ａを環状溝１４または環状溝１５に入れて環状にするのが容易になり、また、経年変化で突き合わせ端部が離間するおそれが少ない。伸縮抑制層２４は、弾性変形層２２より接着剤層２３側に設けてもよい   FIG. 5 shows another embodiment of the annular drip-proof band member 20A used in the drip-proof structure of the lens barrel of the present invention. This embodiment includes a thin expansion / contraction suppression layer (film) 24 that is lower in elasticity (difficult to stretch) than the elastic deformation layer 22 between the drip-proof layer 21 and the elastic deformation layer 22 of the annular drip-proof band material 20A. This is an embodiment. The expansion / contraction suppression layer 24 may be included between the elastic deformation layer 22 and the adhesive layer 23. Alternatively, the adhesive layer 23 may be formed of an adhesive having lower stretchability (difficult to stretch) than the elastic deformation layer 22. The expansion / contraction suppression layer 24 can be composed of any of PET resin, PC, polypropylene, resin sheet material, and resin film material, and PC and polypropylene are particularly preferable. The thickness can be made thinner as the stretchability of the material of the stretch suppressing layer 24 is lower. When this expansion / contraction suppression layer 24 is added, the expansion / contraction of the entire annular drip-proof band material 20A is suppressed, so that it becomes easy to put the cyclic drip-proof band material 20A into the annular groove 14 or the annular groove 15 to form an annular shape, Moreover, there is little possibility that the butt end portion is separated due to secular change. The expansion / contraction suppression layer 24 may be provided closer to the adhesive layer 23 than the elastic deformation layer 22.

上記実施形態では、弾性変形層２２をポリエチレン樹脂から構成したが、ポリウレタン樹脂、ポロン樹脂から構成することも可能である。その厚さは、ポリエチレン樹脂を用いたときと同様でよい。   In the above embodiment, the elastic deformation layer 22 is made of polyethylene resin, but it can also be made of polyurethane resin or poron resin. The thickness may be the same as when polyethylene resin is used.

図６ないし図１０は、環状防滴帯材２０（２０Ａ）の両端部の接続形状の他の例を示している。これらの例も、特許文献１で提案されている。図６の例では、環状防滴帯材２０（２０Ａ）の突き合わせ端部４８と突き合わせ端部５２は、光軸方向直線部３４（光軸方向直線部３８）に相当する光軸方向直線部４９、光軸方向直線部５３と、光軸方向直線部３５（光軸方向直線部３９）に相当する光軸方向直線部５０、光軸方向直線部５４と、周方向直線部３６（周方向直線部４０）に相当する直線部５１、直線部５５を具備している。光軸方向直線部４９（光軸方向直線部５３）の後端位置と光軸方向直線部５０（光軸方向直線部５４）の前端位置は前後にずれているので、直線部５１及び直線部５５は周方向に対して傾斜している。このような形状の突き合わせ端部４８及び突き合わせ端部５２は、突き合わせ端部３３及び突き合わせ端部３７に比べて切断距離がさらに長いので、防滴効果がより大きい。   6 to 10 show other examples of connection shapes at both ends of the annular drip-proof band member 20 (20A). These examples are also proposed in Patent Document 1. In the example of FIG. 6, the butted end portion 48 and the butted end portion 52 of the annular drip-proof band member 20 (20 </ b> A) are the optical axis direction linear portion 49 corresponding to the optical axis direction linear portion 34 (optical axis direction linear portion 38). The optical axis direction linear part 53, the optical axis direction linear part 50 corresponding to the optical axis direction linear part 35 (optical axis direction linear part 39), the optical axis direction linear part 54, and the circumferential direction linear part 36 (circumferential direction straight line). A straight portion 51 and a straight portion 55 corresponding to the portion 40). Since the rear end position of the optical axis direction linear portion 49 (optical axis direction linear portion 53) and the front end position of the optical axis direction linear portion 50 (optical axis direction linear portion 54) are shifted back and forth, the linear portion 51 and the linear portion 55 inclines with respect to the circumferential direction. Since the butt end 48 and the butt end 52 having such a shape have a longer cutting distance than the butt end 33 and the butt end 37, the drip-proof effect is greater.

図７の突き合わせ端部５８と突き合わせ端部６２は、光軸方向直線部３４（光軸方向直線部３８）に相当する光軸方向直線部５９、光軸方向直線部６３と、光軸方向直線部３５（光軸方向直線部３９）に相当する光軸方向直線部６０、光軸方向直線部６４と、周方向直線部３６（周方向直線部４０）に相当する周方向曲線部６１、周方向曲線部６５を具備している。光軸方向直線部５９（光軸方向直線部６３）の後端位置と光軸方向直線部６０（光軸方向直線部６４）の前端位置は同じであり、周方向曲線部６１及び周方向曲線部６５は直線ではなく曲線となっている。このような形状の突き合わせ端部５８及び突き合わせ端部６２は、周方向曲線部６１及び周方向曲線部６５が曲線なので、突き合わせ端部３３及び突き合わせ端部３７に比べて切断距離が長い。従って、図６の場合と同じく防滴効果がより大きい。   The butt end portion 58 and the butt end portion 62 in FIG. 7 are an optical axis direction linear portion 59, an optical axis direction linear portion 63, and an optical axis direction straight line corresponding to the optical axis direction linear portion 34 (optical axis direction linear portion 38). Optical axis direction straight line portion 60, optical axis direction straight line portion 64 corresponding to portion 35 (optical axis direction straight line portion 39), circumferential curve portion 61 corresponding to circumferential direction straight line portion 36 (circumferential straight line portion 40), circumference A direction curve portion 65 is provided. The rear end position of the optical axis direction linear portion 59 (optical axis direction linear portion 63) and the front end position of the optical axis direction linear portion 60 (optical axis direction linear portion 64) are the same, and the circumferential curve portion 61 and the circumferential direction curve are the same. The part 65 is not a straight line but a curved line. The butt end portion 58 and the butt end portion 62 having such a shape have a longer cutting distance than the butt end portion 33 and the butt end portion 37 because the circumferential curve portion 61 and the circumferential curve portion 65 are curved. Accordingly, the drip-proof effect is larger as in the case of FIG.

図８の例では、環状防滴帯材２０（２０Ａ）の突き合わせ端部７１を、光軸Ｏと平行な方向に対して傾斜する直線形状としている。このような形状の突き合わせ端部７０及び突き合わせ端部７１も、環状防滴帯材２０（２０Ａ）の両端を、その長手方向に直交する方向に直線的に切断した場合に比べてその切断距離が長いので、大きな防滴効果を得られる。   In the example of FIG. 8, the butted end portion 71 of the annular drip-proof band member 20 (20 </ b> A) has a linear shape that is inclined with respect to a direction parallel to the optical axis O. The butt end portion 70 and the butt end portion 71 having such a shape also have a cutting distance compared to a case where both ends of the annular drip-proof band member 20 (20A) are linearly cut in a direction perpendicular to the longitudinal direction. Since it is long, a large drip-proof effect can be obtained.

図９の例は、環状防滴帯材２０（２０Ａ）の両突き合わせ端部７３、７４の切断面形状を、環状防滴帯材２０（２０Ａ）の長手方向に直交する方向に延びる直線形状とした例である。   In the example of FIG. 9, the cut surface shape of both butted ends 73 and 74 of the annular drip-proof band member 20 (20A) is a linear shape extending in a direction orthogonal to the longitudinal direction of the annular drip-proof band member 20 (20A). This is an example.

図１０の例では、環状防滴帯材２０（２０Ａ）突き合わせ端部３３と突き合わせ端部３７の中間部に液溜部６６を形成している。このようにすれば、光軸方向直線部３４（光軸方向直線部３８）の前端から突き合わせ端部３３と突き合わせ端部３７の隙間内に侵入した水滴が光軸方向直線部３５（光軸方向直線部３９）の後端に達するのをより効果的に防止できる。なお、図６の突き合わせ端部４８と突き合わせ端部５２の中間部や図７の突き合わせ端部５８と突き合わせ端部６２の中間部に液溜部６６を形成することも勿論可能である。   In the example of FIG. 10, a liquid reservoir 66 is formed at an intermediate portion between the butted end portion 33 and the butted end portion 37 of the annular drip-proof band member 20 (20A). In this way, water droplets that have entered the gap between the butted end portion 33 and the butted end portion 37 from the front end of the optical axis direction linear portion 34 (optical axis direction linear portion 38) are optical axis direction linear portions 35 (optical axis direction). Reaching the rear end of the straight portion 39) can be more effectively prevented. It is of course possible to form the liquid reservoir 66 at the intermediate portion between the butt end portion 48 and the butt end portion 52 in FIG. 6 or the intermediate portion between the butt end portion 58 and the butt end portion 62 in FIG.

本実施形態では、環状防滴帯材２０（２０Ａ）を、相対的な回転運動及び光軸方向移動をする内側環状部材１１と外側環状部材１２の間に設けたが、本発明のレンズ鏡筒の防滴構造は、相対回転運動のみ、あるいは相対直線運動のみをする内外の環状部材の間に適用できるのは勿論である。   In the present embodiment, the annular drip-proof band member 20 (20A) is provided between the inner annular member 11 and the outer annular member 12 that move relative to each other and move in the optical axis direction, but the lens barrel of the present invention. Of course, the drip-proof structure can be applied between the inner and outer annular members that perform only the relative rotational motion or only the relative linear motion.

１０ レンズ鏡筒
１１ 内側環状部材
１２ 外側環状部材
１３ 環状空間（環状隙間）
１４ 環状溝（内方開放環状溝）
１５ 環状溝（外方開放環状溝）
２０ ２０Ａ 環状防滴帯材（ストリップ）
２１ 防滴層（合成皮革層）
２１ａ 起毛面
２２ 弾性変形層
２３ 接着剤層
２４ 伸縮抑制層
Ｏ 光軸 10 lens barrel 11 inner annular member 12 outer annular member 13 annular space (annular gap)
14 annular groove (inwardly open annular groove)
15 annular groove (outwardly open annular groove)
20 20A Ring drip-proof material (strip)
21 Drip-proof layer (synthetic leather layer)
21a Raised surface 22 Elastic deformation layer 23 Adhesive layer 24 Stretch suppression layer O Optical axis

Claims (6)

同軸をなし相対移動可能な内外の環状部材を備え、上記内外の環状部材のいずれか一方の周面に、環状防滴帯材の内外の一方の面を接着し、他方の周面に、環状防滴帯材の内外の他方の面を接触させたレンズ鏡筒の防滴構造において、
上記環状防滴帯材は、防滴層と、該防滴層より低反発性の弾性変形層との積層構造からなり、該弾性変形層が上記内外の環状部材の周面の一方に接着され、該防滴層が上記内外の環状部材の周面の他方に接触することを特徴とするレンズ鏡筒の防滴構造。 An inner and outer annular member that is coaxial and relatively movable is provided, and one of the inner and outer annular members is bonded to one of the inner and outer surfaces of the annular drip-proof material, and the other circumferential surface is annular. In the drip-proof structure of the lens barrel in which the other surface inside and outside of the drip-proof band is in contact,
The annular drip-proof band material has a laminated structure of a drip-proof layer and an elastically deformable layer having a lower resilience than the drip-proof layer. The drip-proof structure of the lens barrel, wherein the drip-proof layer is in contact with the other peripheral surface of the inner and outer annular members. 請求項１記載のレンズ鏡筒の防滴構造において、上記環状防滴帯材を接着する側の環状部材には、該環状防滴帯材を収納する環状溝が形成されており、上記防滴層は該環状溝から径方向外方に突出し、防滴層以外の層は、該環状溝内に位置しているレンズ鏡筒の防滴構造。 2. The drip-proof structure for a lens barrel according to claim 1, wherein an annular groove for housing the annular drip-proof band material is formed in the annular member on the side to which the annular drip-proof band material is bonded, A layer protrudes radially outward from the annular groove, and a layer other than the drip-proof layer is a drip-proof structure of the lens barrel located in the annular groove. 請求項１または２記載のレンズ鏡筒の防滴構造において、上記弾性変形層は、ポリエチレン樹脂、ポリウレタン樹脂、ポロン樹脂のいずれかから構成されるレンズ鏡筒の防滴構造。 In water-resistant according to claim 1 or 2 lens barrel, wherein the elastic deformation layer is, polyethylene resin, polyurethane resin, drip-proof structure of the lens barrel that consists of either a Poron resin. 請求項１ないし３のいずれか１項記載のレンズ鏡筒の防滴構造において、上記防滴層は、環状部材との接触面に起毛処理が施されているレンズ鏡筒の防滴構造。 The drip-proof structure for a lens barrel according to any one of claims 1 to 3, wherein the drip-proof layer is a drip-proof structure for a lens barrel in which a brushed surface is applied to the contact surface with the annular member. 請求項１ないし４のいずれか１項記載のレンズ鏡筒の防滴構造において、上記環状防滴帯材は、さらに、上記防滴層より弾性変形層側に位置させて、該弾性変形層より低伸縮性で薄肉の伸縮抑制層を含んでいるレンズ鏡筒の防滴構造。 5. The drip-proof structure of the lens barrel according to claim 1, wherein the annular drip-proof band material is further positioned on the elastic deformation layer side than the drip-proof layer, and is formed from the elastic deformation layer. A lens barrel drip-proof structure that includes a low-stretch, thin-walled stretch-reducing layer. 請求項５記載のレンズ鏡筒の防滴構造において、上記伸縮抑制層は、ペット樹脂、ＰＣ、ポリプロピレン、樹脂シート材、樹脂フィルム材のいずれかから構成されるレンズ鏡筒の防滴構造。 In drip-proof structure of the lens barrel according to claim 5, wherein the expansion suppressing layer, PET resin, PC, polypropylene, resin sheet, drip-proof structure of the lens barrel that consists of either a resin film material.
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