JP4946910B2 - Lens cap - Google Patents

Lens cap Download PDF

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JP4946910B2
JP4946910B2 JP2008040765A JP2008040765A JP4946910B2 JP 4946910 B2 JP4946910 B2 JP 4946910B2 JP 2008040765 A JP2008040765 A JP 2008040765A JP 2008040765 A JP2008040765 A JP 2008040765A JP 4946910 B2 JP4946910 B2 JP 4946910B2
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lens
cap body
cap
pair
outer diameter
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JP2008123006A (en
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健太郎 寺尾
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Nikon Corp
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本発明は、たとえばスチルカメラ、ビデオカメラ等に用いるレンズのレンズ鏡筒前端部内周の係合部に着脱自在に装着されるレンズキャップに関するものである。   The present invention relates to a lens cap that is detachably attached to an engagement portion at the inner periphery of a lens barrel front end of a lens used in, for example, a still camera or a video camera.

従来、カメラの非撮影時にレンズを保護する為にレンズ鏡筒前端部内周の係合部に装着するレンズキャップとして、以下のようなものがある。つまり、円形状のキャップ本体に対して、レンズ鏡筒前端部内周の係合部に係合するとともに、使用者の操作により、キャップ本体の中心方向へ待避して係合を解除される一対の操作部を設けたものである。   2. Description of the Related Art Conventionally, there are the following lens caps that are attached to the engaging portion of the inner periphery of the front end of the lens barrel in order to protect the lens when the camera is not photographed. In other words, a pair of circular cap bodies that engage with the engaging portion of the inner periphery of the front end of the lens barrel and that are retracted in the center direction of the cap body by a user operation are released. An operation unit is provided.

この操作部はキャップ本体に対して放射方向へバネ等により付勢されており、また、このレンズキャップは操作部のキャップ本体からの抜け止めとして、操作部に設けられた溝とキャップ本体に設けた突起部を係合させる構成となっている。また、対向する一対の操作部の光軸方向のねじの位相はレンズ鏡筒の係合部に取り付けた際に係合をより深く、確実に行うことができるように、お互いにねじの半ピッチずらした構成となっている。そして、組立時に、光軸方向のねじの位相が同じ操作部を誤ってキャップ本体へ装着することを防止するため、形状の異なる操作部をそれぞれ組にして使用する。さらに、レンズ鏡筒への装着時における位置決めや取り付けガタ防止のため、レンズ鏡筒の係合部のねじ内径よりも僅かに小さな径の円環状のガイド部がキャップ本体の外周部近傍に設けられている。   This operation unit is urged by a spring or the like in the radial direction with respect to the cap body, and this lens cap is provided in a groove provided in the operation unit and the cap body as a stopper to prevent the operation unit from being detached from the cap body. The protrusion is engaged. Also, the phase of the screw in the optical axis direction of the pair of opposed operation parts is half the pitch of the screws so that the engagement can be deeper and surer when attached to the engagement part of the lens barrel. It has a shifted configuration. Then, in order to prevent an operation unit having the same phase of the screw in the optical axis direction from being erroneously attached to the cap body during assembly, the operation units having different shapes are used in pairs. Furthermore, an annular guide portion having a diameter slightly smaller than the screw inner diameter of the engaging portion of the lens barrel is provided in the vicinity of the outer peripheral portion of the cap body in order to prevent positioning and mounting play when the lens barrel is mounted. ing.

このような構成においては、操作部に対するキャップ本体の放射方向への付勢力により、キャップ本体に設けられた係止用突起部がキャップ本体の円板側から離反する方向に塑性変形することがあり、レンズキャップをレンズに装着した際に、変形した係止用突起部がレンズの先端面に傷をつける恐れがあった。また、対向する一対の操作部のそれぞれの形状が異なるため、操作部を成型するためのモールドの金型であるキャビ型とコア型を共通化することができず、コストアップの要因になっていた。   In such a configuration, the locking projection provided on the cap body may be plastically deformed in a direction away from the disk side of the cap body due to the urging force of the cap body in the radial direction with respect to the operation unit. When the lens cap is attached to the lens, the deformed locking projection may damage the front end surface of the lens. In addition, since the shape of each of the pair of opposed operation parts is different, it is not possible to make the mold and the core mold, which are molds for molding the operation part, common, which causes a cost increase. It was.

上記の如き構成においては、以下のような不具合があった。つまり、ねじ込み式レンズフードをレンズに取り付けた状態でレンズキャップを装着可能にすることを考慮して、キャップ本体の円環状のガイド部の径をレンズフード取り付け部の内径よりも小さな径にすると、レンズキャップを直接レンズ鏡筒に装着した場合、取り付け後のガタが大きくなり、レンズへのゴミや水滴の侵入の恐れがあった。   The above configuration has the following problems. In other words, considering that the lens cap can be attached with the screwed lens hood attached to the lens, the diameter of the annular guide portion of the cap body is smaller than the inner diameter of the lens hood attachment portion. When the lens cap was directly attached to the lens barrel, the looseness after the attachment became large, and there was a risk of dust and water droplets entering the lens.

請求項１に記載の発明によれば、レンズ鏡筒前端部の内周の第１係合部と、前記第１係合部にアクセサリが取付けられた場合の前記アクセサリの内周であって前記第１係合部とは異なる径の第２係合部と、に着脱自在に装着されるレンズキャップにおいて、
前記第１係合部に係合可能な第１の外径と、前記第２係合部に係合可能な第２の外径とを有する取付用ガイド部と、
円板状に形成され、前記取付用ガイド部を前記円板状の外周面に有しているキャップ本体と、
前記キャップ本体の径方向において互いに対向するように形成された一対の切欠部に装着され、前記キャップ本体の前記外周面の外方に突出するように付勢される一対の操作部とを有し、
前記キャップ本体は、一端が固定され、他端が前記キャップ本体から離れる方向に弾性変形可能に構成されるとともに、前記操作部に係合してこれを係止する係止用突起部を有することを特徴とする。
According to the first aspect of the present invention, the first engaging portion on the inner periphery of the front end portion of the lens barrel and the inner periphery of the accessory when the accessory is attached to the first engaging portion, In the lens cap that is detachably attached to the second engaging portion having a diameter different from that of the first engaging portion ,
A mounting guide portion having a first outer diameter engageable with the first engagement portion and a second outer diameter engageable with the second engagement portion ;
Formed in a disk shape, and in that the cap body has the mounting guide portion on an outer peripheral surface of the disc-shaped,
Wherein in the radial direction of the cap body is mounted on a pair of notches formed so as to face each other, and a pair of operation portions which are biased so as to protrude outward of the outer peripheral surface of the cap body ,
The cap body is configured such that one end is fixed and the other end is elastically deformable in a direction away from the cap body, and has a locking projection that engages and locks the operation portion. It is characterized by.

本発明のレンズキャップによれば、レンズ鏡筒に取付ガタを少なく装着することが可能である。   According to the lens cap of the present invention, it is possible to attach a small amount of mounting play to the lens barrel.

以下に、本発明の実施形態を図１および図２と共に説明する。図１は本発明の一実施例であるレンズキャップの正面図であり、右半分に組み立て状態を、左半分に分解状態をあらわしている。図２（ａ）は図１に示すＰ側面図、図２（ｂ）は同じくＱ−Ｑ断面図、図２（ｃ）は同じくＲ−Ｒ断面図、図２（ｄ）は同じくＳ−Ｓ断面図である。図１に示すように、本レンズキャップは合成樹脂等で略円板状に成形されたキャップ本体１と、一対の操作部２等から構成されている。キャップ本体１の周辺部の互いに対向する位置に一対の切欠部３が設けられており、それぞれの切欠部３には、相対向する摺動ガイド面４が形成されている。摺動ガイド面４の近傍には、操作部の抜け止めのために、操作部の溝１２に係合する係止用突起部が設けられている。この突起部は図２（ｂ）に示すように、その一端がキャップ本体１に固定されており、他端がキャップ本体１にほぼ直交する方向に弾性変形可能に形成されている。係止用突起部５の先端部はくさび状になっており、操作部の溝端面１２ａに対してキャップ本体１の略中央部に向かう方向に向くように面が形成されている。またキャップ本体１の中央部から対向する切欠部方向に伸びた２本の円柱状のばねガイド軸８が形成されている。さらに、ばねガイド軸８の近傍に、ばねガイド軸８と平行に、２本の円柱状の位置決め軸９がキャップ本体中央部１９から対向する切欠部方向に伸びるように形成されている。一方、操作部２はキャップ本体１の外周と同様な円弧形状をもつ押圧部１０と、キャップ本体１の摺動ガイド面４に挿接する摺動面１１と、キャップ本体１の係止用突起部５の先端が入り込む溝１２と、押圧部１０より内径側に段違いの円弧状突起部１３とから構成されており、円弧状突起部１３の端面にはレンズ鏡筒前端部内周の係合部に契合するためのねじ部１４が設けられている。一対の操作部２は互いに異なる位相で形成されたねじ部１４を有している。また押圧部１０と反対側の端面１５には、キャップ本体１のばねガイド軸８と位置決め軸９に対応する位置にそれぞれの軸が挿入可能なばねガイド軸用穴１６と位置決め軸用穴１７が形成されている。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a front view of a lens cap according to an embodiment of the present invention, in which an assembled state is shown in the right half and an exploded state is shown in the left half. 2 (a) is a side view of the P shown in FIG. 1, FIG. 2 (b) is a sectional view taken along the line QQ, FIG. 2 (c) is a sectional view taken along the line RR, and FIG. It is sectional drawing. As shown in FIG. 1, the lens cap includes a cap body 1 formed in a substantially disc shape with a synthetic resin or the like, a pair of operation portions 2 and the like. A pair of notches 3 are provided at positions facing each other in the periphery of the cap body 1, and opposing slide guide surfaces 4 are formed in the respective notches 3. In the vicinity of the sliding guide surface 4, a locking projection that engages with the groove 12 of the operating portion is provided to prevent the operating portion from coming off. As shown in FIG. 2B, one end of the protrusion is fixed to the cap body 1, and the other end is formed to be elastically deformable in a direction substantially perpendicular to the cap body 1. The front end of the locking projection 5 has a wedge shape, and a surface is formed so as to face the groove end surface 12a of the operation portion toward the substantially central portion of the cap body 1. In addition, two cylindrical spring guide shafts 8 extending from the center of the cap body 1 toward the facing notch are formed. Further, in the vicinity of the spring guide shaft 8, two cylindrical positioning shafts 9 are formed in parallel with the spring guide shaft 8 so as to extend from the cap body central portion 19 toward the notch portion. On the other hand, the operation unit 2 includes a pressing unit 10 having an arc shape similar to the outer periphery of the cap body 1, a sliding surface 11 that is inserted into the sliding guide surface 4 of the cap body 1, and a locking projection of the cap body 1. 5 is configured with a groove 12 into which the tip of 5 is inserted, and an arc-shaped projection 13 that is stepped on the inner diameter side from the pressing portion 10, and an end surface of the arc-shaped projection 13 is provided at an engagement portion on the inner periphery of the lens barrel front end. A threaded portion 14 is provided for engagement. A pair of operation part 2 has the thread part 14 formed in a mutually different phase. The end face 15 opposite to the pressing portion 10 has a spring guide shaft hole 16 and a positioning shaft hole 17 into which the respective shafts can be inserted at positions corresponding to the spring guide shaft 8 and the positioning shaft 9 of the cap body 1. Is formed.

レンズキャップの組立は以下のように行う。キャップ本体１の対向するばねガイド軸８にコイルばね１８をセットし、操作部２の摺動面１１をキャップ本体１の摺動ガイド面４に合わせ、ばねの抗力に抗うようにレンズキャップの中心部に向けて操作部２を押し込んでいく。係止用突起部５がキャップ本体１から離反する方向に一旦変形し、係止用突起部の先端が溝１２に到達すると溝１２に入り込む。この状態からさらに操作部２をレンズキャップの中心部に向けて押し込んでいくと、端面１５がキャップ本体中央部１９に突き当たり、操作部２の押し込み方向の制限となる。ここで操作部２を押し込む力を解除するとコイルばね１８の働きにより一対の操作部２はそれぞれ外方へ向けた力を受け、溝端面１２ａが係止用突起部５の先端に当接するまで移動する。このとき操作部２に外方に突出する力が作用した場合は、溝端面１２ａに係合している係止用突起部５の先端は圧縮方向の力を受けるが、その係合位置は、係止用突起部５の弾性変形中心位置２０に比べ、キャップ本体の面に直交する方向において、よりキャップ本体１側にあるため、係止用突起部５の先端は溝１２のより深い方向（図２（ｂ）における上方向）に付勢される。 The lens cap is assembled as follows. A coil spring 18 is set on the opposing spring guide shaft 8 of the cap body 1, the sliding surface 11 of the operating portion 2 is aligned with the sliding guide surface 4 of the cap body 1, and the center of the lens cap is resisted against the drag of the spring. The operation unit 2 is pushed toward the unit. When the locking projection 5 is once deformed in a direction away from the cap body 1 and the tip of the locking projection reaches the groove 12, the locking projection 5 enters the groove 12. When the operation unit 2 is further pushed toward the center portion of the lens cap from this state, the end surface 15 hits the cap main body central portion 19, which restricts the pushing direction of the operation unit 2. When the force that pushes in the operating portion 2 is released, the pair of operating portions 2 receive outward force by the action of the coil spring 18 and move until the groove end surface 12a contacts the tip of the locking projection 5. To do. At this time, when a force that protrudes outward acts on the operating portion 2, the tip of the locking projection 5 that is engaged with the groove end surface 12a receives a force in the compression direction. Compared with the elastic deformation center position 20 of the locking projection 5, since it is closer to the cap body 1 in the direction perpendicular to the surface of the cap body, the tip of the locking projection 5 is deeper in the groove 12 ( It is energized in the upward direction in FIG.

前述したように、一対の操作部２の、キャップ本体１の面に直交する軸方向のねじの位相はお互いに半ピッチずらして構成されている。これによりレンズキャップをレンズ鏡筒３０に装着した際の両者のねじ結合をより深く、確実に行うようにするためであるが、本実施例の操作部２のキャップ本体１に対する取付部の形状、すなわちばねガイド軸８とばねガイド軸用穴１６、位置決め軸９と位置決め軸用穴１７のそれぞれの配置はキャップ本体１に直交し、かつキャップ本体１の中心を通る軸に対してそれぞれ回転非対称であるように構成したので、キャップ本体１の面に直交する軸方向のねじの位相が同じである同一種類の操作部２を誤ってキャップ本体１へ装着することを未然に防止できる。   As described above, the phases of the screws in the axial direction perpendicular to the surface of the cap main body 1 of the pair of operation units 2 are shifted from each other by a half pitch. This is to deepen and surely perform screw connection between the two when the lens cap is attached to the lens barrel 30, and the shape of the attachment portion of the operation portion 2 of the present embodiment to the cap body 1, That is, the arrangement of the spring guide shaft 8 and the spring guide shaft hole 16 and the positioning shaft 9 and the positioning shaft hole 17 are rotationally asymmetric with respect to an axis orthogonal to the cap body 1 and passing through the center of the cap body 1. Since it is configured as described above, it is possible to prevent the same type of operation unit 2 having the same phase of the axial screw perpendicular to the surface of the cap body 1 from being erroneously attached to the cap body 1 in advance.

また、一対の操作部２の押圧部１０、摺動面１１、溝１２などの基本形状は同一であるため、射出成形におけるキャビ型、コア型はそれぞれ共通の構成にすることが可能となる。一方、ばねガイド軸用穴１６、位置決め軸用穴１７、およびねじ部１４はアンダーカット部のため、スライド型による成形となる。この際、一対の操作部２は、キャップ本体１の面に直交する軸方向のねじの位相が半ピッチずれていること、ばねガイド軸用穴１６、位置決め軸用穴１７の配置関係が異なっていることの理由により、スライド型は共通にはできないが、ねじ部１４、ばねガイド軸用穴１６、位置決め軸用穴１７の個々の形状はほぼ同一のため、成型時におけるヒケ、ウェルド対策は共通して対処可能である。図２（ｄ）に示すように、キャップ本体１の裏面の外周部には、レンズ鏡筒前端部内周の係合部よりも小径の複数の直径を有する円環状の突起部により構成された取付用ガイド部大径部３１ａ、取付用ガイド部小径部３１ｂが設けられている。   In addition, since the basic shapes of the pressing portion 10, the sliding surface 11, the groove 12 and the like of the pair of operation portions 2 are the same, the cavity mold and the core mold in the injection molding can have a common configuration. On the other hand, the spring guide shaft hole 16, the positioning shaft hole 17, and the screw portion 14 are undercut portions, and thus are formed by a slide mold. At this time, the pair of operation portions 2 are different in that the phase of the screw in the axial direction perpendicular to the surface of the cap body 1 is shifted by a half pitch, and the arrangement relationship of the spring guide shaft hole 16 and the positioning shaft hole 17 is different. The slide type cannot be made common because of the fact that the individual shapes of the threaded portion 14, the spring guide shaft hole 16, and the positioning shaft hole 17 are substantially the same, and therefore, there are common measures against sink marks and welds during molding. Can be dealt with. As shown in FIG. 2 (d), the outer peripheral portion of the back surface of the cap body 1 is formed by an annular protrusion having a plurality of diameters smaller than the engaging portion of the inner periphery of the front end portion of the lens barrel. A guide portion large-diameter portion 31a and a mounting guide portion small-diameter portion 31b are provided.

図３は本発明の一実施例であるレンズキャップの、レンズ鏡筒への装着を示す断面図であり、図４は本発明の一実施例であるレンズキャップの、レンズフードを取りつけたレンズ鏡筒への装着を示す断面図である。   FIG. 3 is a sectional view showing the mounting of a lens cap according to an embodiment of the present invention to a lens barrel, and FIG. 4 is a lens mirror with a lens hood attached to the lens cap according to an embodiment of the present invention. It is sectional drawing which shows the mounting | wearing to a pipe | tube.

取付用ガイド大径部３１ａの外径（ΦＤ２）はレンズ鏡筒前端部内周の係合部の内径（ΦＤ１）よりも若干小さく、取付用ガイド小径部３１ｂの外径（ΦＤ４）はレンズ鏡筒前端部に装着した例えばレンズフード３４等のねじ込み式アクセサリの取付部の内径（ΦＤ３）よりも若干小さく形成されている。従ってレンズ鏡筒３０にレンズキャップを装着する場合には、図３（ｂ）に示すように取付用ガイド大径部３１ａの外径部がレンズ鏡筒前端部内周の内径部に係合することで径方向の位置決めが行われ、径方向の位置決めガタ量は最大値がＤ１−Ｄ２に収まる。またレンズ鏡筒前端部にレンズフード３４等を装着した状態でレンズキャップを装着する場合には、図４（ｂ）に示すように取付用ガイド小径部３１ｂの外径部がレンズフード３４等の取付部の内径部に係合することで径方向の位置決めが行われ、径方向の位置決めガタ量は最大値がＤ３−Ｄ４に収まる。また、図５（ａ）、図６（ａ）に示すように取付用ガイド部を連続的に外径が変化する斜面３５を含む構成にしてもよい。以下に詳細を説明する。取付用ガイド部３１の斜面３５による取付用ガイド部の最大径（ΦＤ２）はレンズ鏡筒前端部内周の係合部の内径（ΦＤ１）よりも若干小さく、同じく最小径（ΦＤ４）はレンズ鏡筒前端部に装着した例えばレンズフード３４等のねじ込み式アクセサリの取付部の内径（ΦＤ３）よりも若干小さく形成されている。従ってレンズ鏡筒３０にレンズキャップを装着する場合には、図５（ｂ）に示すように斜面３５による取付用ガイド部の最大径部がレンズ鏡筒前端部内周の内径部に係合することで径方向の位置決めが行われ、径方向の位置決めガタ量は最大値がＤ１−Ｄ２に収まる。またレンズ鏡筒前端部にレンズフード３４等を装着した状態でレンズキャップを装着する場合には、図６（ｂ）に示すように斜面３５による取付用ガイド部の最小径部がレンズフード３４等の取付部の内径部に係合することで径方向の位置決めが行われ、径方向の位置決めガタ量は最大値がＤ３−Ｄ４に収まる。   The outer diameter (ΦD2) of the mounting guide large diameter portion 31a is slightly smaller than the inner diameter (ΦD1) of the engaging portion at the inner periphery of the front end of the lens barrel, and the outer diameter (ΦD4) of the mounting guide small diameter portion 31b is the lens barrel. For example, it is formed slightly smaller than the inner diameter (ΦD3) of a mounting portion of a screw-type accessory such as a lens hood 34 attached to the front end portion. Therefore, when the lens cap is attached to the lens barrel 30, as shown in FIG. 3B, the outer diameter portion of the mounting guide large diameter portion 31a is engaged with the inner diameter portion of the inner periphery of the lens barrel front end portion. Thus, the positioning in the radial direction is performed, and the maximum value of the positioning play in the radial direction is within D1-D2. When the lens cap is attached with the lens hood 34 attached to the front end of the lens barrel, as shown in FIG. 4B, the outer diameter portion of the mounting guide small diameter portion 31b is the lens hood 34 or the like. By engaging with the inner diameter portion of the mounting portion, the positioning in the radial direction is performed, and the maximum value of the positioning play amount in the radial direction is within D3-D4. Further, as shown in FIGS. 5 (a) and 6 (a), the mounting guide portion may include a slope 35 having a continuously changing outer diameter. Details will be described below. The maximum diameter (ΦD2) of the mounting guide portion due to the inclined surface 35 of the mounting guide portion 31 is slightly smaller than the inner diameter (ΦD1) of the engaging portion at the inner periphery of the front end of the lens barrel, and the minimum diameter (ΦD4) is also the lens barrel. For example, it is formed slightly smaller than the inner diameter (ΦD3) of a mounting portion of a screw-type accessory such as a lens hood 34 attached to the front end portion. Therefore, when a lens cap is attached to the lens barrel 30, as shown in FIG. 5B, the maximum diameter portion of the mounting guide portion by the inclined surface 35 is engaged with the inner diameter portion of the inner periphery of the front end portion of the lens barrel. Thus, the positioning in the radial direction is performed, and the maximum value of the positioning play in the radial direction is within D1-D2. When the lens cap is attached with the lens hood 34 attached to the front end of the lens barrel, as shown in FIG. 6B, the minimum diameter portion of the mounting guide portion by the inclined surface 35 is the lens hood 34 etc. By engaging with the inner diameter portion of the mounting portion, the radial positioning is performed, and the maximum value of the radial positioning play amount falls within D3-D4.

レンズキャップをレンズ鏡筒３０に装着するには、まず、操作部２のねじ部１４の外径がレンズ鏡筒前端部内周の係合部内径よりも小さくなるまで、一対の操作部２をレンズキャップの中心方向に押し込み、次にレンズキャップをレンズ鏡筒前端部に押し当てた後に押圧部１０を解放することによって、レンズ鏡筒前端部内周の係合部に係合させる。   In order to attach the lens cap to the lens barrel 30, first, the pair of operation portions 2 is moved to the lens until the outer diameter of the screw portion 14 of the operation portion 2 becomes smaller than the inner diameter of the engagement portion at the inner periphery of the front end portion of the lens barrel. The lens barrel is pushed into the center, and then the lens cap is pressed against the front end of the lens barrel, and then the pressing portion 10 is released to engage with the engaging portion on the inner periphery of the front end of the lens barrel.

以上のように本発明の一実施例の如きレンズキャップによれば、キャップ本体に設けられ、一端が固定され、他端がキャップ本体にほぼ直交する方向に弾性変形可能に構成されるとともに、操作部に係合してこれを係止する係止用突起部を備え、係止用突起部と操作部との係合位置は、係止用突起部の弾性変形中心位置に比べ、光軸方向において、よりキャップ本体側にあるように構成したために、操作部に外方に突出する力が働いた場合に、係止用突起部は操作部材側に移動する方向にのみ力を受けるためレンズ側に変形することはない。従ってレンズキャップをレンズに装着した際に、塑性変形した係止用突起部がレンズの先端ガラス面を傷つける恐れがない。   As described above, according to the lens cap according to the embodiment of the present invention, the cap is provided on the cap body, one end is fixed, the other end is configured to be elastically deformable in a direction substantially perpendicular to the cap body, and the operation is performed. A locking projection that engages and locks the locking portion, and the engagement position between the locking projection and the operating portion is in the optical axis direction compared to the elastic deformation center position of the locking projection. Therefore, when a force that protrudes outward is applied to the operating portion, the locking projection receives the force only in the direction of moving toward the operating member, so that the lens side There is no deformation. Therefore, when the lens cap is attached to the lens, there is no fear that the locking projection part that is plastically deformed damages the front end glass surface of the lens.

また操作部の各部の形状をほぼ同一にしつつ、操作部のキャップ本体に対する取付部の形状をキャップ本体に直交する軸に対してそれぞれ回転非対称に構成したので、一対の内の同じ操作部をキャップ本体に装着することを防止しながらも、モールドの金型であるキャビ型とコア型に関して、一対の操作部についての共通化が図れ、スライド型の成型時におけるヒケ、ウェルド対策は共通して対処可能となる。   In addition, since the shape of the mounting portion of the operation portion with respect to the cap body of the operation portion is configured to be rotationally asymmetric with respect to the axis orthogonal to the cap body, while the shape of each portion of the operation portion is substantially the same, While preventing it from being attached to the main body, it is possible to share a pair of operation parts for the mold and mold molds, which are mold molds. It becomes possible.

また取付用ガイド部は複数の外径を有するように構成したので、レンズ鏡筒単体もしくはレンズ鏡筒にレンズフード等のねじ込み式アクセサリを取り付けたいずれの状態においても、取付ガタを少なくレンズキャップを装着することが可能であり、レンズ内へゴミや水滴が侵入し難くなるとともに、大きな取付ガタが原因でレンズキャップが傾いて取り付いてしまい、キャップの一部分がレンズ鏡筒前端部の内側に入り込み、レンズのガラス表面に傷をつけることもない。   In addition, since the mounting guide portion is configured to have a plurality of outer diameters, the lens cap can be mounted with less mounting backlash in any state where the lens barrel alone or a screw-type accessory such as a lens hood is attached to the lens barrel. It is possible to attach it, and it is difficult for dust and water droplets to enter the lens, and the lens cap tilts due to large mounting play, and a part of the cap enters the inside of the front end of the lens barrel, The glass surface of the lens is not damaged.

本発明の実施例に関わるレンズキャップの正面図である。It is a front view of the lens cap concerning the Example of this invention. 本発明の実施例に関わるレンズキャップの側面図および断面図である。It is the side view and sectional drawing of the lens cap concerning the Example of this invention. 本発明の実施例に関わるレンズキャップの、レンズ鏡筒への装着を示す断面図である。It is sectional drawing which shows mounting | wearing to the lens barrel of the lens cap concerning the Example of this invention. 本発明の実施例に関わるレンズキャップの、レンズフードを取りつけたレンズ鏡筒への装着を示す断面図である。It is sectional drawing which shows mounting | wearing to the lens barrel which attached the lens hood of the lens cap concerning the Example of this invention. 本発明の別の実施例に関わるレンズキャップのレンズ鏡筒への装着を示す断面図である。It is sectional drawing which shows mounting | wearing to the lens-barrel of the lens cap concerning another Example of this invention. 本発明の別の実施例に関わるレンズキャップの、レンズフードを取りつけたレンズ鏡筒への装着を示す断面図である。It is sectional drawing which shows mounting | wearing to the lens-barrel which attached the lens hood of the lens cap concerning another Example of this invention.

符号の説明Explanation of symbols

１…キャップ本体
２…操作部
５…係止用突起部
３１ａ…取付用ガイド大径部
３１ｂ…取付用ガイド小径部 DESCRIPTION OF SYMBOLS 1 ... Cap main body 2 ... Operation part 5 ... Locking projection part 31a ... Installation guide large diameter part 31b ... Installation guide small diameter part

Claims (7)

レンズ鏡筒前端部の内周の第１係合部と、前記第１係合部にアクセサリが取付けられた場合の前記アクセサリの内周であって前記第１係合部とは異なる径の第２係合部と、に着脱自在に装着されるレンズキャップにおいて、
前記第１係合部に係合可能な第１の外径と、前記第２係合部に係合可能な第２の外径とを有する取付用ガイド部と、
円板状に形成され、前記取付用ガイド部を前記円板状の外周面に有しているキャップ本体と、
前記キャップ本体の径方向において互いに対向するように形成された一対の切欠部に装着され、前記キャップ本体の前記外周面の外方に突出するように付勢される一対の操作部とを有し、
前記キャップ本体は、一端が固定され、他端が前記キャップ本体から離れる方向に弾性変形可能に構成されるとともに、前記操作部に係合してこれを係止する係止用突起部を有することを特徴とするレンズキャップ。 A first engaging portion on the inner periphery of the front end portion of the lens barrel, and an inner periphery of the accessory when the accessory is attached to the first engaging portion, and having a diameter different from that of the first engaging portion. In the lens cap that is detachably attached to the two engaging portions ,
A mounting guide portion having a first outer diameter engageable with the first engagement portion and a second outer diameter engageable with the second engagement portion ;
Formed in a disk shape, and in that the cap body has the mounting guide portion on an outer peripheral surface of the disc-shaped,
Wherein in the radial direction of the cap body is mounted on a pair of notches formed so as to face each other, and a pair of operation portions which are biased so as to protrude outward of the outer peripheral surface of the cap body ,
The cap body is configured such that one end is fixed and the other end is elastically deformable in a direction away from the cap body, and has a locking projection that engages and locks the operation portion. Lens cap characterized by. 前記第１の外径は、前記第２の外径より大きな外径を有しており、
前記レンズ鏡筒に装着された際に、前記第２の外径は、前記第１の外径より前記レンズ鏡筒から離れる方向に配置されていることを特徴とする請求項１に記載のレンズキャップ。 The first outer diameter has an outer diameter larger than the second outer diameter,
2. The lens according to claim 1 , wherein when the lens barrel is mounted, the second outer diameter is arranged in a direction away from the lens barrel from the first outer diameter. 3. cap. 前記取付用ガイド部は、前記第１の外径と前記第２の外径との間で径が連続的に変化する斜面を有することを特徴とする請求項１又は２に記載のレンズキャップ。 3. The lens cap according to claim 1, wherein the mounting guide portion has a slope whose diameter continuously changes between the first outer diameter and the second outer diameter . 前記一対の操作部は、第１ガイド軸用穴と第１位置決め軸用穴とを有する第１操作部と、第２ガイド軸用穴と第２位置決め軸用穴とを有する第２操作部とを備え、
前記一対の操作部は、前記キャップ本体から取り外されている状態において、前記第１操作部における前記第１ガイド軸用穴と前記第１位置決め軸用穴との配置が、前記第２操作部における前記第２ガイド軸用穴と前記第２位置決め軸用穴との配置と異なるように形成されており、
前記キャップ本体に前記一対の操作部が取付けられた際に、前記キャップ本体と前記一対の操作部との外周面には、前記係合部に係合するねじ山が連続して形成されることを特徴とする請求項１〜３の何れか一項に記載のレンズキャップ。 The pair of operation portions includes a first operation portion having a first guide shaft hole and a first positioning shaft hole, and a second operation portion having a second guide shaft hole and a second positioning shaft hole. With
In a state where the pair of operation parts are detached from the cap body, the arrangement of the first guide shaft hole and the first positioning shaft hole in the first operation part is determined in the second operation part. The second guide shaft hole and the second positioning shaft hole are formed differently from each other,
When the pair of operation portions are attached to the cap body, a thread that engages with the engagement portion is continuously formed on the outer peripheral surface of the cap body and the pair of operation portions. The lens cap according to any one of claims 1 to 3, wherein: 前記一対の取付部は、前記キャップ本体の中心部を通るとともに前記円板状の面内の直線に対して線対称に配置されていることを特徴とする請求項４に記載のレンズキャップ。 5. The lens cap according to claim 4 , wherein the pair of attachment portions are disposed symmetrically with respect to a straight line in the disc-shaped plane while passing through a center portion of the cap body . 前記係止用突起部と前記操作部との係合位置は、前記係止用突起部の弾性変形中心位置に比べ、光軸方向において、より前記キャップ本体側にあることを特徴とする請求項１〜５の何れか一項に記載のレンズキャップ。 The engagement position between the locking projection and the operation portion is located closer to the cap body in the optical axis direction than the elastic deformation center position of the locking projection. The lens cap according to any one of 1 to 5 . 前記一対の操作部は、前記レンズキャップが前記係合部に装着された際に前記レンズ鏡筒前端部側に位置する面に、溝がそれぞれ形成されており、
前記係止用突起部は、前記操作部が前記キャップ本体に取付けられた際に、前記溝に少なくとも一部が入り込む先端部を有し、
前記先端部は、前記溝に向かって傾斜する一面を有するくさび状に形成されていることを特徴とする請求項１〜６の何れか一項に記載のレンズキャップ。 Each of the pair of operation portions has a groove formed on a surface positioned on the lens barrel front end side when the lens cap is attached to the engagement portion.
The locking projection has a tip portion at least partially entering the groove when the operation portion is attached to the cap body,
The lens cap according to any one of claims 1 to 6, wherein the tip is formed in a wedge shape having a surface inclined toward the groove .
JP2008040765A 2008-02-22 2008-02-22 Lens cap Expired - Fee Related JP4946910B2 (en)

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