JP4414686B2

JP4414686B2 - Lens barrel

Info

Publication number: JP4414686B2
Application number: JP2003178542A
Authority: JP
Inventors: 育鈴木
Original assignee: Olympus Corp
Current assignee: Olympus Corp
Priority date: 2003-06-23
Filing date: 2003-06-23
Publication date: 2010-02-10
Anticipated expiration: 2023-06-23
Also published as: JP2005017392A

Description

【０００１】
【発明の属する技術分野】
本発明は、カメラにおけるレンズ鏡筒に関し、とくに相対的に移動可能に設けられた第一の枠部材と第二の枠部材との間を防水する手段を備えたレンズ鏡筒に関する。
【０００２】
【従来の技術】
一般に、ズームレンズを備えたカメラにおいては、第一の枠部材と第二の枠部材との相対的移動によりズーミングが行なわれる。相対的移動を行なう第一の枠部材と第二の枠部材との間の隙間から雨滴などが侵入するのを防止するために、第一の枠部材の外周面と第二の枠部材の内周面との間には、通常、何らかの防水手段が施される。このような防水手段として、カム筒の外周面と第一レンズ枠の内周面との間に、シリコンゴム等からなるシール部材を介在させたものが知られている（特許文献１参照）。
【０００３】
【特許文献１】
特開平０５−１７３２４０号公報（段落［００１３］、図５）
【０００４】
【発明が解決しようとする課題】
特許文献１に示されている防水手段を用いれば、第一の枠部材と第二の枠部材との間の隙間から雨滴などが侵入するのを防止できる。しかしながら特許文献１に示されているものでは、シール部材と第一の枠部材または第二の枠部材との間の摩擦抵抗が比較的大きい。このためズーミングの負荷が増大し、ズーム用モーターなどに負担をかけることになる。
【０００５】
本発明は、このような事情に基づいてなされたものであり、その目的は、十分な液密性と、円滑なズーミング動作を同時に確保できる防水手段を備えたレンズ鏡筒を提供することにある。
【０００６】
【課題を解決するための手段】
前記課題を解決し目的を達成するために、本発明のレンズ鏡筒は下記のような特徴ある構成を有している。なお下記以外の特徴ある構成については実施形態の中で明らかにする。
【０００７】
本発明のレンズ鏡筒は、軸心部に光軸を有する第一の枠部材と、この第一の枠部材の外周に同軸的に嵌め込まれ且つ前記光軸に沿って第一の枠部材と相対的に移動可能に設けられた第二の枠部材と、この第二の枠部材と前記第一の枠部材との対向面のいずれか一方に、周方向に沿って形成された環状の溝部と、この環状の溝部の中に同軸的に装着された環状の防水部材とを備え、
前記環状の溝部は、前記光軸を含む平面で切断した断面において、前記光軸方向に所定幅に亘って所定深さに穿たれた矩形状をなし、
前記環状の防水部材は、前記光軸を含む平面で切断した断面において、前記環状の溝部における内底部に形成された対向部位と上記溝部に対向する枠部材側の対向部位とに対し交互に圧接している複数の突起部を備え、
上記二つの対向部位に上記複数の突起の先端部分が接触することにより前記防水部材の幅方向の両端間を撓ませた、
ことを特徴とする。
【０００８】
【発明の実施の形態】
（第一実施形態）
図１は本発明の第一実施形態に係るレンズ鏡筒の概略的構成を示す図で、光軸を境として上半部分を切断して示す断面図である。図２は同実施形態に係るレンズ鏡筒の一部の構成を示す分解斜視図、図３は同実施形態に係るレンズ鏡筒の他の一部の構成を示す分解斜視図である。なお図２のＭは図３のＮにつながる。
【０００９】
図１〜図３において、符号１００は軸心部に光軸ＯＡを有する略円筒状の第一の枠部材である。この第一の枠部材１００の中空部内には、１群レンズ１１０、２群レンズ１２０、３群レンズ１３０、４群レンズ１４０が収容されている。１群レンズ１１０は、カム環１５０の回転により移動し、位置制御がなされる。また２群レンズ１２０、３群レンズ１３０、４群レンズ１４０は、カム環１５０の回転により、第一ガイドロッド１６１、第二ガイドロッド１６２（不図示）に沿って移動し、相対的な位置制御がなされる。
【００１０】
なお符号１７０はフィルタ環、１７２は２群レンズ枠、１７３は３群レンズ枠、１７４は４群レンズ枠を示している。また符号１８０は絞り羽根、１８１は絞り駆動枠、１８２は絞り移動枠を示している。
【００１１】
図１〜図３において、符号２００は前記第一の枠部材１００の外周に嵌め込まれた第二の枠部材(固定枠)である。第一の枠部材１００と第二の枠部材２００とは、光軸方向に相対的に移動可能となっている。第一の枠部材１００は、第二の枠部材２００に装着されているズーム環２５０の回転により、光軸方向に移動して所謂ズーミング動作が行なわれる。第一の枠部材１００の外周面と第二の枠部材２００の内周面との間には、例えばゴム製の環状をなす防水部材３１０が介在している。
【００１２】
第二の枠部材２００の前端部（図１において左端部）には、前カバー部材２１０が装着されている。第二の枠部材２００の外周面上には、図１において右方向から距離環２２０、距離表示環２３０、ズーム台環２４０、ズーム環２５０、後カバー部材２６０等が順次嵌め込まれている。上記後カバー部材２６０には、防水機能付き通気手段（２６１，２６２，２６３）が備えられている。第二の枠部材２００の後端部には、上記後カバー部材２６０の外側中央部位に位置する如く、レンズマウント部材２７０がビス止めされている。
【００１３】
第二の枠部材２００の前端部と前カバー部材２１０と距離環２２０との三者接合部位には、Ｏリングからなる第一のシール部材３０１が介在している。距離環２２０と距離表示環２３０との間にはＯリングからなる第二のシール部材３０２が介在している。距離表示環２３０とズーム台環２４０のリング部２４１との間にはＯリングからなる第三のシール部材３０３が介在している。ズーム台環２４０のリング部２４１とズーム環２５０との間にはＯリングからなる第四のシール部材３０４が介在している。ズーム環２５０と後カバー部材２６０との間にはＯリングからなる第五のシール部材３０５が介在している。また後カバー部材２６０とレンズマウント部材２７０との間には、例えばゴム製の環状をなす防水リング３２０が介在している。
【００１４】
なお符号２２１は距離パルス発生用リングである。また符号２３１は距離接片、２３２は目盛り環、２３３は透明部材からなる距離表示窓である。また符号２５１はズーム接片、２５２は接片蓋、２５３はズームゴムリングである。更に符号２６１は通気用の開口部、２６２は撥水シート、２６３は保護カバーであり、これらは前記防水機能付き通気手段を構成している。符号２８０は一般にカンザと呼ばれる厚み寸法調整用のスペーサである。符号２９０はカバー後枠、２９１は防塵部材である。
【００１５】
次に第一の枠部材１００の外周面と第二の枠部材２００の内周面との間に介在している環状の防水部材３１０について詳しく説明する。図４の（ａ）（ｂ）は環状の防水部材３１０の構成を示す図で、（ａ）は正面図、（ｂ）は（ａ）の４ｂ−４ｂ線矢視断面図である。図５は第二の枠部材２００の対向面に、周方向に沿って形成された環状の溝部２１１の中に、環状の防水部材３１０が同軸的に装着された状態を示す断面図である。
【００１６】
環状の溝部２１１は、図５に示すように、光軸ＯＡを含む平面で切断した断面において、光軸ＯＡ方向(図５において左右方向)に所定幅に亘って所定深さに穿たれた矩形状の断面を有している。
【００１７】
環状の防水部材３１０は、図４の（ａ）（ｂ）及び図５に示すように、正面から見ると円環状をなしている。そして光軸ＯＡを含む平面で切断した断面を見ると、前記溝部２１１の幅に相当する幅Ｗを有する矩形状部材３１４を主体としている。この矩形状部材３１４の内外両側面には、前記環状の溝部２１１における内底部に形成された対向部位Ｂ２と、上記溝部２１１に対向する第一の枠部材１００の対向部位Ｂ１に対し、交互に圧接する複数個(本実施形態では３個)の突起部（実際には環状の突条）３１１，３１２，３１３が形成されている。すなわち、矩形状部材３１４の一側面(図中上側面)の幅方向中央部位に、溝部２１１の対向部位Ｂ２に当接する環状の第一の突条３１１が形成されており、矩形状部材３１４の他側面の幅方向両端部位に、第一の枠部材１００の対向部位Ｂ１に当接する環状の第二，第三の突条３１２，３１３が形成されている。
【００１８】
かくして溝部２１１内に装着された防水部材３１０は、溝部２１１の対向部位Ｂ２と第一の枠部材１００の対向部位Ｂ１に対し所定間隔で交互に圧接するものとなる。このため防水部材３１０は圧縮変形し、図５に破線Ｃで示すように矩形状部材３１４が半円弧状に撓む。かくして複数の突条による多重の防水効果を発揮すると共に、第一の枠部材１００の対向部位Ｂ１に接触する部分は、各突条の先端部分に限られるため、第一の枠部材１００と第二の枠部材１００との相対移動時における第一の枠部材１００との間の摩擦抵抗が少ない。このためズーミング動作時の相対的移動が円滑に行なわれ得る。
【００１９】
（第二実施形態）
図６は本発明の第二実施形態の主要部の構成を示す断面図である。本実施形態が第一実施形態と異なる点は、図示の如く第一の枠部材１００側に環状の溝部１０１を形成し、その中に防水部材３１０を装着した点である。このような構成であっても第一実施形態の場合と略同様の作用効果を期待できる。
【００２０】
（実施形態における特徴点）
［１］実施形態に示されたレンズ鏡筒は、
軸心部に光軸ＯＡを有する第一の枠部材１００と、この第一の枠部材１００の外周に同軸的に嵌め込まれ且つ前記光軸に沿って第一の枠部材と相対的に移動可能に設けられた第二の枠部材２００と、この第二の枠部材２００と前記第一の枠部材１００との対向面のいずれか一方に、周方向に沿って形成された環状の溝部２１１又は１０１と、この環状の溝部２１１又は１０１の中に同軸的に装着された環状の防水部材３１０とを備え、
前記環状の溝部２１１又は１０１は、前記光軸ＯＡを含む平面で切断した断面において、前記光軸ＯＡ方向に所定幅に亘って所定深さに穿たれた矩形状をなし、
前記環状の防水部材３１０は、前記光軸ＯＡを含む平面で切断した断面において、前記環状の溝部２１１又は１０１における内底部に形成された対向部位Ｂ２またはＢ１と上記溝部２１１又は１０１に対向する枠部材側の対向部位Ｂ１又はＢ２とに対し交互に圧接する複数の突起部３１１，３１２，３１３…（４１１，４１２，４１３…）を備えた形状をなしていることを特徴とする。
【００２１】
上記レンズ鏡筒においては、環状の防水部材３１０の、複数の突起部（すなわち環状をなす複数の突条）３１１，３１２，３１３…（４１１，４１２，４１３…）が、対向部位Ｂ１及びＢ２に対し交互に圧接するものとなる。このため単一の防水部材３１０でありながら、複数の突条による多重の防水効果が発揮される。従って優れた防水効果が期待できる。又、防水部材３１０が対向部位Ｂ１及びＢ２に接触する部分は、各突条の先端部分に限られる。このため突条を有しない防水部材に比べると、第一の枠部材１００と第二の枠部材１００との相対移動時における防水部材３１０と枠部材との間の摩擦抵抗が少ない。かくしてズーミング動作時の第一の枠部材１００と第二の枠部材２００との相対的移動が円滑に行なわれ得る。
【００２２】
［２］実施形態に示されたレンズ鏡筒は、［１］に記載のレンズ鏡筒であって、
前記防水部材３１０は、前記光軸ＯＡを含む平面で切断した断面において、前記溝部２１１又は１０１の幅に相当する幅Ｗを有する矩形状部材３１４と、この矩形状部材３１４の一側面の幅方向中央部位に形成され前記両対向部位Ｂ１，Ｂ２のいずれか一方に当接する環状の第一の突条３１１と、前記矩形状部材３１４の他側面の幅方向両端部位にそれぞれ形成され前記両対向部位Ｂ１，Ｂ２の他方に当接する環状の第二,第三の突条３１２，３１３とを有することを特徴とする。
【００２３】
上記レンズ鏡筒においては、防水部材３１０の合計三つの突条が、矩形状部材３１４の幅方向中心に対して左右対称に設けられている。このため溝部２１１又は１０１内に装着された矩形状部材３１４は、光軸ＯＡ方向に沿って半円弧状に反リ返った態様を呈する。その結果、防水機能が十分に確保される。しかも第一の枠部材１００と第二の枠部材２００との相対的な移動方向に拘らず、上記防水部材３１０の矩形状部材３１４には、常に一様な応力が加わることになる。このため防水部材３１０の劣化が少なく、長期間の使用に耐え得るものとなる。
【００２４】
（変形例）
実施形態に示されたレンズ鏡筒は、下記の変形例を含んでいる。
【００２５】
・防水部材として、図７の（ａ）に示すように、第一の突条３１１を矩形状部材３１４の内側面に設け、第二,第三の突条３１２，３１３を矩形状部材３１４の外側面に設けた形状をなす防水部材３１０を用いたもの。
【００２６】
・防水部材として、図７の（ｂ）に示すように、部材間の対向部位に対し交互に圧接可能な複数の突状４１１，４１２，４１３，４１４，４１５を有する波形状をなす防水部材４１０を用いたもの。
【００２７】
【発明の効果】
本発明においては、防水部材として、光軸を含む平面で切断した断面において、第一,第二の枠部材の対向部位に対し交互に圧接する複数の突起部を備えた波形状をなす防水部材を用いている。このため複数の環状をなす突条による多重の防水効果が発揮される上、第一,第二の枠部材との摩擦抵抗が小さいものとなる。従って本発明によれば、十分な液密性と、円滑なズーミング動作を同時に確保できる防水手段を備えたレンズ鏡筒を提供できる。
【図面の簡単な説明】
【図１】本発明の第一実施形態に係るレンズ鏡筒の概略的な構成を示す斜視図。
【図２】本発明の第一実施形態に係るレンズ鏡筒の一部の構成を示す分解斜視図。
【図３】本発明の第一実施形態に係るレンズ鏡筒の他の一部の構成を示す分解斜視図。
【図４】本発明の第一実施形態に係るレンズ鏡筒における環状の防水部材の構成を示す図で、（ａ）は正面図、（ｂ）は（ａ）の４ｂ−４ｂ線矢視断面図。
【図５】本発明の第一実施形態に係る環状の溝部の中に環状の防水部材が装着された状態を示す断面図。
【図６】本発明の第二実施形態に係るレンズ鏡筒における要部の構成を示す断面図。
【図７】（ａ）および（ｂ）はそれぞれ防水部材の異なる変形例を示す断面図。
【符号の説明】
ＯＡ光軸
１００第一の枠部材
１１０〜１４０１群レンズ〜４群レンズ
２００第二の枠部材
２１０前カバー部材
２４０ズーム台環
２２０距離環
２３０距離表示環
２５０ズーム環
２６０後カバー部材
２７０レンズマウント部材
２８０厚み寸法調整用のスペーサ（カンザ）
２９０カバー後枠
３０１〜３０５第一〜第五のシール部材
３１０防水部材
３２０防水リング[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens barrel in a camera, and more particularly to a lens barrel provided with a means for waterproofing between a first frame member and a second frame member that are relatively movable.
[0002]
[Prior art]
Generally, in a camera equipped with a zoom lens, zooming is performed by relative movement between a first frame member and a second frame member. In order to prevent raindrops and the like from entering through the gap between the first frame member and the second frame member that perform relative movement, the outer peripheral surface of the first frame member and the second frame member Some waterproofing means is usually applied between the peripheral surface. As such waterproofing means, a sealing member made of silicon rubber or the like is interposed between the outer peripheral surface of the cam cylinder and the inner peripheral surface of the first lens frame (see Patent Document 1).
[0003]
[Patent Document 1]
JP 05-173240 A (paragraph [0013], FIG. 5)
[0004]
[Problems to be solved by the invention]
If the waterproof means shown by patent document 1 is used, it can prevent that a raindrop etc. penetrate | invade from the clearance gap between a 1st frame member and a 2nd frame member. However, in what is shown in Patent Document 1, the frictional resistance between the seal member and the first frame member or the second frame member is relatively large. This increases the zooming load and places a burden on the zoom motor and the like.
[0005]
The present invention has been made based on such circumstances, and an object of the present invention is to provide a lens barrel provided with waterproof means capable of simultaneously ensuring sufficient liquid tightness and smooth zooming operation. .
[0006]
[Means for Solving the Problems]
In order to solve the above problems and achieve the object, the lens barrel of the present invention has the following characteristic configuration. Note that features other than those described below will be clarified in the embodiments.
[0007]
The lens barrel of the present invention includes a first frame member having an optical axis in an axial center portion, a first frame member fitted coaxially to the outer periphery of the first frame member and along the optical axis. An annular groove formed in the circumferential direction on either one of the second frame member provided so as to be relatively movable and the opposing surface of the second frame member and the first frame member And an annular waterproof member coaxially mounted in the annular groove,
The annular groove has a rectangular shape that is cut at a predetermined depth over a predetermined width in the optical axis direction in a cross section cut by a plane including the optical axis,
The annular waterproofing member is alternately pressed against an opposing part formed on an inner bottom part of the annular groove part and an opposing part on the frame member side facing the groove part in a cross section cut along a plane including the optical axis. A plurality of protruding portions,
Bending between both ends in the width direction of the waterproof member by contacting the tip portions of the plurality of protrusions to the two opposing portions,
It is characterized by that.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 is a diagram showing a schematic configuration of a lens barrel according to a first embodiment of the present invention, and is a cross-sectional view showing an upper half portion cut along an optical axis. FIG. 2 is an exploded perspective view showing a partial configuration of the lens barrel according to the embodiment, and FIG. 3 is an exploded perspective view showing another configuration of the lens barrel according to the embodiment. 2 is connected to N in FIG.
[0009]
1 to 3, reference numeral 100 denotes a substantially cylindrical first frame member having an optical axis OA in the axial center portion. In the hollow portion of the first frame member 100, a first group lens 110, a second group lens 120, a third group lens 130, and a fourth group lens 140 are housed. The first group lens 110 is moved by the rotation of the cam ring 150, and the position is controlled. Further, the second group lens 120, the third group lens 130, and the fourth group lens 140 move along the first guide rod 161 and the second guide rod 162 (not shown) by the rotation of the cam ring 150, and relative position control is performed. Is made.
[0010]
Reference numeral 170 denotes a filter ring, 172 denotes a second group lens frame, 173 denotes a third group lens frame, and 174 denotes a fourth group lens frame. Reference numeral 180 denotes an aperture blade, 181 denotes an aperture drive frame, and 182 denotes an aperture movement frame.
[0011]
1 to 3, reference numeral 200 denotes a second frame member (fixed frame) fitted on the outer periphery of the first frame member 100. The first frame member 100 and the second frame member 200 are relatively movable in the optical axis direction. The first frame member 100 is moved in the optical axis direction by the rotation of the zoom ring 250 mounted on the second frame member 200, so that a so-called zooming operation is performed. Between the outer peripheral surface of the first frame member 100 and the inner peripheral surface of the second frame member 200, for example, a waterproof member 310 having an annular shape made of rubber is interposed.
[0012]
A front cover member 210 is attached to the front end portion (left end portion in FIG. 1) of the second frame member 200. On the outer peripheral surface of the second frame member 200, a distance ring 220, a distance display ring 230, a zoom base ring 240, a zoom ring 250, a rear cover member 260, and the like are sequentially fitted from the right in FIG. The rear cover member 260 is provided with ventilation means (261, 262, 263) with a waterproof function. A lens mount member 270 is screwed to the rear end portion of the second frame member 200 so as to be positioned at the outer central portion of the rear cover member 260.
[0013]
A first seal member 301 formed of an O-ring is interposed at a three-part joint portion of the front end portion of the second frame member 200, the front cover member 210, and the distance ring 220. A second seal member 302 made of an O-ring is interposed between the distance ring 220 and the distance display ring 230. A third seal member 303 made of an O-ring is interposed between the distance display ring 230 and the ring portion 241 of the zoom stage ring 240. A fourth seal member 304 made of an O-ring is interposed between the ring portion 241 of the zoom stage ring 240 and the zoom ring 250. A fifth seal member 305 made of an O-ring is interposed between the zoom ring 250 and the rear cover member 260. Further, between the rear cover member 260 and the lens mount member 270, for example, a waterproof ring 320 having an annular shape made of rubber is interposed.
[0014]
Reference numeral 221 denotes a distance pulse generating ring. Reference numeral 231 is a distance contact piece, 232 is a scale ring, and 233 is a distance display window made of a transparent member. Reference numeral 251 denotes a zoom contact piece, 252 denotes a contact piece cover, and 253 denotes a zoom rubber ring. Further, reference numeral 261 denotes an opening for ventilation, 262 denotes a water repellent sheet, and 263 denotes a protective cover, and these constitute the ventilation means with waterproof function. Reference numeral 280 denotes a thickness dimension adjusting spacer generally referred to as “Kanza”. Reference numeral 290 denotes a cover rear frame, and 291 denotes a dustproof member.
[0015]
Next, the annular waterproof member 310 interposed between the outer peripheral surface of the first frame member 100 and the inner peripheral surface of the second frame member 200 will be described in detail. 4A and 4B are views showing the configuration of the annular waterproof member 310, where FIG. 4A is a front view and FIG. 4B is a cross-sectional view taken along line 4b-4b in FIG. FIG. 5 is a cross-sectional view showing a state in which an annular waterproof member 310 is coaxially mounted in an annular groove 211 formed along the circumferential direction on the opposing surface of the second frame member 200.
[0016]
As shown in FIG. 5, the annular groove 211 has a rectangular shape that is drilled at a predetermined depth over a predetermined width in the direction of the optical axis OA (the left-right direction in FIG. 5) in a cross section cut along a plane including the optical axis OA. It has a cross section of shape.
[0017]
As shown in FIGS. 4A and 4B and FIG. 5, the annular waterproof member 310 has an annular shape when viewed from the front. When a cross section cut along a plane including the optical axis OA is viewed, a rectangular member 314 having a width W corresponding to the width of the groove 211 is mainly used. On both the inner and outer side surfaces of the rectangular member 314, an opposing part B2 formed on the inner bottom part of the annular groove part 211 and an opposing part B1 of the first frame member 100 facing the groove part 211 alternately Plural (in this embodiment, three) protrusions (actually annular protrusions) 311, 312, and 313 that are in pressure contact are formed. That is, an annular first protrusion 311 that abuts against the facing portion B2 of the groove portion 211 is formed at a central portion in the width direction of one side surface (upper side surface in the drawing) of the rectangular member 314. Ring-shaped second and third protrusions 312 and 313 that abut against the facing portion B1 of the first frame member 100 are formed at both ends in the width direction of the other side surface.
[0018]
Thus, the waterproof member 310 mounted in the groove portion 211 is alternately pressed against the facing portion B2 of the groove portion 211 and the facing portion B1 of the first frame member 100 at a predetermined interval. Therefore, the waterproof member 310 is compressed and deformed, and the rectangular member 314 is bent into a semicircular arc shape as indicated by a broken line C in FIG. Thus, while exhibiting the multiple waterproof effect by several protrusions, since the part which contacts the opposing site | part B1 of the 1st frame member 100 is restricted to the front-end | tip part of each protrusion, the 1st frame member 100 and 1st There is little frictional resistance between the second frame member 100 and the first frame member 100 at the time of relative movement. For this reason, the relative movement during the zooming operation can be performed smoothly.
[0019]
(Second embodiment)
FIG. 6 is a sectional view showing the configuration of the main part of the second embodiment of the present invention. This embodiment is different from the first embodiment in that an annular groove 101 is formed on the first frame member 100 side as shown in the figure, and a waterproof member 310 is mounted therein. Even with such a configuration, substantially the same effect as in the case of the first embodiment can be expected.
[0020]
(Feature points in the embodiment)
[1] The lens barrel shown in the embodiment is
A first frame member 100 having an optical axis OA in the axial center, and is fitted coaxially to the outer periphery of the first frame member 100 and is movable relative to the first frame member along the optical axis. An annular groove 211 formed in the circumferential direction on either one of the second frame member 200 provided on the opposite surface of the second frame member 200 and the first frame member 100, or 101 and an annular waterproofing member 310 mounted coaxially in the annular groove 211 or 101,
The annular groove 211 or 101 has a rectangular shape that is perforated at a predetermined depth over a predetermined width in the direction of the optical axis OA in a cross section cut by a plane including the optical axis OA.
The annular waterproof member 310 has a frame facing the groove portion 211 or 101 and a facing portion B2 or B1 formed in the inner bottom portion of the annular groove portion 211 or 101 in a cross section cut along a plane including the optical axis OA. It has a shape with a plurality of protrusions 311, 312, 313... (411, 412, 413...) That are alternately pressed against the opposing part B 1 or B 2 on the member side.
[0021]
In the lens barrel, a plurality of protrusions (that is, a plurality of protrusions forming an annular shape) 311, 312, 313 (411, 412, 413. On the other hand, it is pressed alternately. For this reason, although it is the single waterproof member 310, the multiple waterproof effect by a some protrusion is exhibited. Therefore, an excellent waterproof effect can be expected. Moreover, the part where the waterproof member 310 contacts the facing parts B1 and B2 is limited to the tip part of each protrusion. For this reason, compared with the waterproof member which does not have a protrusion, the frictional resistance between the waterproof member 310 and the frame member at the time of the relative movement of the 1st frame member 100 and the 2nd frame member 100 is few. Thus, the relative movement between the first frame member 100 and the second frame member 200 during the zooming operation can be performed smoothly.
[0022]
[2] The lens barrel shown in the embodiment is the lens barrel according to [1],
The waterproof member 310 includes a rectangular member 314 having a width W corresponding to the width of the groove 211 or 101 and a width direction of one side surface of the rectangular member 314 in a cross section cut along a plane including the optical axis OA. An annular first protrusion 311 that is formed at the central portion and abuts against one of the opposing portions B1 and B2, and the opposing portions are formed at both ends in the width direction of the other side surface of the rectangular member 314. It has an annular second and third protrusions 312 and 313 that abut against the other of B1 and B2.
[0023]
In the lens barrel, the total three protrusions of the waterproof member 310 are provided symmetrically with respect to the center of the rectangular member 314 in the width direction. For this reason, the rectangular member 314 mounted in the groove portion 211 or 101 exhibits an aspect in which it is bent in a semicircular arc shape along the optical axis OA direction. As a result, a sufficient waterproof function is ensured. In addition, regardless of the relative movement direction of the first frame member 100 and the second frame member 200, a uniform stress is always applied to the rectangular member 314 of the waterproof member 310. For this reason, the waterproof member 310 is less deteriorated and can withstand long-term use.
[0024]
(Modification)
The lens barrel shown in the embodiment includes the following modifications.
[0025]
As the waterproof member, as shown in FIG. 7A, the first protrusion 311 is provided on the inner surface of the rectangular member 314, and the second and third protrusions 312 and 313 are provided on the rectangular member 314. A waterproof member 310 having a shape provided on the outer surface is used.
[0026]
As the waterproof member, as shown in FIG. 7 (b), the waterproof member 410 having a wave shape having a plurality of protrusions 411, 412, 413, 414, and 415 that can be alternately pressed against opposing portions between the members. The one using.
[0027]
【The invention's effect】
In the present invention, as a waterproof member, in a cross section cut by a plane including the optical axis, a waterproof member having a wave shape provided with a plurality of protrusions that are alternately pressed against opposing portions of the first and second frame members Is used. For this reason, the multiple waterproof effect by the plurality of annular ridges is exhibited, and the frictional resistance with the first and second frame members is small. Therefore, according to the present invention, it is possible to provide a lens barrel provided with waterproof means that can ensure sufficient liquid tightness and smooth zooming operation at the same time.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of a lens barrel according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view showing a partial configuration of the lens barrel according to the first embodiment of the present invention.
FIG. 3 is an exploded perspective view showing the configuration of another part of the lens barrel according to the first embodiment of the present invention.
4A and 4B are diagrams showing a configuration of an annular waterproof member in the lens barrel according to the first embodiment of the present invention, where FIG. 4A is a front view, and FIG. 4B is a cross-sectional view taken along line 4b-4b in FIG. Figure.
FIG. 5 is a cross-sectional view showing a state in which an annular waterproof member is mounted in an annular groove according to the first embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a configuration of a main part of a lens barrel according to a second embodiment of the present invention.
7A and 7B are cross-sectional views showing different modifications of the waterproof member.
[Explanation of symbols]
OA optical axis 100 first frame members 110 to 140 first group lens to fourth group lens 200 second frame member 210 front cover member 240 zoom base ring 220 distance ring 230 distance display ring 250 zoom ring 260 rear cover member 270 lens mount Member 280 Thickness adjustment spacer (Kanza)
290 Rear cover frames 301 to 305 First to fifth seal members 310 Waterproof member 320 Waterproof ring

Claims

軸心部に光軸を有する第一の枠部材と、この第一の枠部材の外周に同軸的に嵌め込まれ且つ前記光軸に沿って第一の枠部材と相対的に移動可能に設けられた第二の枠部材と、この第二の枠部材と前記第一の枠部材との対向面のいずれか一方に、周方向に沿って形成された環状の溝部と、この環状の溝部の中に同軸的に装着された環状の防水部材とを備え、
前記環状の溝部は、前記光軸を含む平面で切断した断面において、前記光軸方向に所定幅に亘って所定深さに穿たれた矩形状をなし、
前記環状の防水部材は、前記光軸を含む平面で切断した断面において、前記環状の溝部における内底部に形成された対向部位と上記溝部に対向する枠部材側の対向部位とに対し交互に圧接している複数の突起部を備え、
上記二つの対向部位に上記複数の突起の先端部分が接触することにより前記防水部材の幅方向の両端間を撓ませた、
ことを特徴とするレンズ鏡筒。A first frame member having an optical axis in the axial center portion, and is fitted coaxially to the outer periphery of the first frame member and is movable relative to the first frame member along the optical axis. A second frame member, an annular groove formed in the circumferential direction on one of the opposing surfaces of the second frame member and the first frame member, and An annular waterproofing member coaxially mounted on the
The annular groove portion has a rectangular shape that is cut at a predetermined depth over a predetermined width in the optical axis direction in a cross section cut by a plane including the optical axis,
The annular waterproofing member is alternately pressed against an opposing part formed on an inner bottom part of the annular groove part and an opposing part on the frame member side facing the groove part in a cross section cut along a plane including the optical axis. A plurality of protruding portions,
Bending between both ends in the width direction of the waterproof member by contacting the tip portions of the plurality of protrusions to the two opposing portions,
A lens barrel characterized by that.

前記防水部材は、前記光軸を含む平面で切断した断面において、前記溝部の幅に相当する幅を有する矩形状部材と、この矩形状部材の一側面の幅方向中央部位に形成され前記両対向部位のいずれか一方に当接する環状の第一の突条と、前記矩形状部材の他側面の幅方向両端部位にそれぞれ形成され前記両対向部位の他方に当接する環状の第二，第三の突条と、を有することを特徴とする請求項１に記載のレンズ鏡筒。 The waterproof member is formed in a rectangular member having a width corresponding to the width of the groove portion in a cross section cut along a plane including the optical axis, and the both opposing sides formed at a central portion in the width direction of one side surface of the rectangular member. An annular first ridge that contacts either one of the parts, and annular second and third parts that are formed at both ends in the width direction of the other side of the rectangular member and contact the other of the opposing parts. The lens barrel according to claim 1, further comprising a protrusion.