JP2004258646A - Lens barrel structure for zoom lens - Google Patents

Lens barrel structure for zoom lens Download PDF

Info

Publication number
JP2004258646A
JP2004258646A JP2004028774A JP2004028774A JP2004258646A JP 2004258646 A JP2004258646 A JP 2004258646A JP 2004028774 A JP2004028774 A JP 2004028774A JP 2004028774 A JP2004028774 A JP 2004028774A JP 2004258646 A JP2004258646 A JP 2004258646A
Authority
JP
Japan
Prior art keywords
lens
lens group
group frame
cylinder
cam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2004028774A
Other languages
Japanese (ja)
Other versions
JP4050239B2 (en
Inventor
Hiroshi Nomura
博 野村
Yoshihiro Yamazaki
伊広 山崎
Isao Okuda
功 奥田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentax Corp
Original Assignee
Pentax Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pentax Corp filed Critical Pentax Corp
Priority to JP2004028774A priority Critical patent/JP4050239B2/en
Publication of JP2004258646A publication Critical patent/JP2004258646A/en
Application granted granted Critical
Publication of JP4050239B2 publication Critical patent/JP4050239B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Lens Barrels (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel structure for a zoom lens constituted so that a light shielding decorative barrel simply fixed to a 1st lens group frame in the conventional manner is converted to be multifunctional. <P>SOLUTION: The lens barrel structure for the zoom lens is equipped with a cam ring driven to be rotated; a 1st lens group frame positioned on the outer circumference of the cam ring and guided to advance straight in the optical axis direction and supporting the foremost lens group of a zoom lens system; a light shielding decorative barrel positioned on the outer circumferential of the 1st lens group frame; and a cam groove for a lens group frame engaged with a cam follower provided in the 1st lens group frame and a cam groove for a decorative barrel engaged with a cam follower provided in the light shielding decorative barrel, which are formed on the outer circumferential surface of the cam ring. The cam follower of the light shielding decorative barrel passes through a straight advance guiding groove parallel with the optical axis formed in the 1st lens group frame and is engaged with the cam groove for the decorative barrel, and the cam groove for the lens group frame and the cam groove for the decorative barrel have shapes that move the 1st lens group frame and the light shielding decorative barrel with the same locus in the optical axis direction in the photographic area of the zoom lens. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

本発明は、ズームレンズの鏡筒構造に関し、特に回転駆動されるカム環により、最も物体側に位置するレンズ群を支持した第1レンズ群枠を光軸方向に進退させる鏡筒構造に関する。   The present invention relates to a lens barrel structure of a zoom lens, and more particularly, to a lens barrel structure in which a first lens group frame supporting a lens group located closest to an object is moved forward and backward by a rotationally driven cam ring.

ズームレンズ鏡筒では、回転駆動されるカム環により、最も物体側に位置するレンズ群を支持した第1レンズ群枠を移動させることが広く行われている。第1レンズ群枠は、例えば、第1レンズ群より後方に位置する第2レンズ群でズーム調整を行う場合には、調整のための開口を設けるのが普通であり、別部材としての遮光飾り筒をその外周面に設けるのが一般的である(例えば、特許文献1)。
特開2001−215385号公報
In a zoom lens barrel, it is widely used to move a first lens group frame supporting a lens group located closest to the object side by a cam ring that is driven to rotate. For example, when performing zoom adjustment with the second lens group located behind the first lens group, the first lens group frame usually has an opening for adjustment, and a light-shielding decoration as a separate member is provided. Generally, a tube is provided on the outer peripheral surface (for example, Patent Document 1).
JP 2001-215385 A

この遮光飾り筒は従来、単純に第1レンズ群枠に固定されており、上記開口を塞ぐ以外に機能がなかった。   Conventionally, the light-shielding decorative cylinder is simply fixed to the first lens group frame, and has no function other than closing the opening.

本発明は、従来、単純に第1レンズ群枠に固定されていた遮光飾り筒を多機能化したズームレンズの鏡筒構造を提供することを目的とする。   SUMMARY OF THE INVENTION It is an object of the present invention to provide a lens barrel structure of a zoom lens in which a light-shielding decorative barrel simply fixed to a first lens group frame is multifunctional.

本発明のズームレンズの鏡筒構造は、回転駆動されるカム環;このカム環の外周に位置し光軸方向に直進案内された、ズームレンズ系の最も前方のレンズ群を支持する第1レンズ群枠;この第1レンズ群枠の外周に位置する遮光飾り筒;及び上記カム環の外周面に形成された、上記第1レンズ群枠に設けたカムフォロアと係合するレンズ群枠用カム溝と、上記遮光飾り筒に設けたカムフォロアと係合する飾り筒用カム溝;を備え、上記遮光飾り筒のカムフォロアは、第1レンズ群枠に形成した光軸と平行な直進案内溝を通って上記飾り筒用カム溝に係合しており、上記レンズ群枠用カム溝と飾り筒用カム溝は、ズームレンズの撮影領域では、第1レンズ群枠と遮光飾り筒を同一の軌跡で光軸方向に移動させる形状をなしていることを特徴としている。   The lens barrel structure of the zoom lens according to the present invention includes a cam ring that is driven to rotate; a first lens that is located on the outer periphery of the cam ring and that is guided straight in the optical axis direction and that supports the frontmost lens group of the zoom lens system. A group frame; a light-shielding decorative tube located on the outer periphery of the first lens group frame; and a cam groove for the lens group frame formed on the outer peripheral surface of the cam ring and engaged with a cam follower provided on the first lens group frame. And a cam groove for a decorative cylinder that engages with a cam follower provided in the light-shielding decorative cylinder; the cam follower of the light-shielding decorative cylinder passes through a straight guide groove formed in the first lens group frame and parallel to the optical axis. The cam groove for the decorative cylinder is engaged with the cam groove for the decorative cylinder, and the cam groove for the lens group frame and the cam groove for the decorative cylinder are arranged so that the first lens group frame and the light-shielding decorative cylinder have the same locus in the photographing area of the zoom lens. Characterized in that it is shaped to move in the axial direction. There.

上記遮光飾り筒の前端部でバリアを支持するとともに、収納領域では撮影領域に比べて、上記遮光飾り筒を第1レンズ群枠に対して前方に位置させて、収納領域で上記バリアを上記第1レンズ枠に支持されたレンズ群より前方に位置させるのが好ましい。   In addition to supporting the barrier at the front end of the light-shielding decorative cylinder, the light-shielding decorative cylinder is positioned forward of the first lens group frame in the storage area as compared with the photographing area, and the barrier is moved in the storage area to the first position. It is preferable to position the lens group in front of the lens group supported by one lens frame.

さらに、上記第1レンズ群枠は、外筒、内筒及び該外筒と内筒の先端部を接続したフランジ壁とを有し、この外筒と内筒との間にカム環が位置しているのが良好である。   Further, the first lens group frame has an outer cylinder, an inner cylinder, and a flange wall connecting the distal end of the outer cylinder and the inner cylinder, and a cam ring is located between the outer cylinder and the inner cylinder. Good to have.

さらに、第1レンズ群枠の内筒内面に、光軸方向に直進案内された第2レンズ群枠が支持されており、上記第1レンズ群枠には、この第2レンズ群枠に支持された第2レンズ群の光軸方向位置を調整するための開口を形成するのが好ましい。   Further, a second lens group frame guided straight in the optical axis direction is supported on the inner surface of the inner cylinder of the first lens group frame, and the first lens group frame is supported by the second lens group frame. It is preferable to form an opening for adjusting the position of the second lens group in the optical axis direction.

第1レンズ群枠と遮光飾り筒との間に、第1レンズ群枠に対して遮光飾り筒を前進させる方向に付勢するばね手段を介在させるのが良い。   It is preferable to interpose a spring means between the first lens group frame and the light-shielding decorative cylinder in order to bias the light-shielding decorative cylinder in a direction to advance the first lens group frame.

本発明によれば、従来は遮光機能しか有していなかった遮光飾り筒を多機能化することができる。   ADVANTAGE OF THE INVENTION According to this invention, the light shielding decorative cylinder which had only the light shielding function conventionally can be made multifunctional.

最初に、図1について、本実施形態のズームレンズ鏡筒を適用するズームレンズ光学系を説明する。このズームレンズ系は、物体側から順に、正のパワーの第1レンズ群L1、負のパワーの第2レンズ群L2、正のパワーの第3レンズ群L3、及び正のパワーの第4レンズ群L4からなるバリフォーカルレンズ系である。変倍は、第1から第3レンズ群L1〜L3で行い、変倍に伴う焦点移動を第4レンズ群L4で補正する。変倍時に第1レンズ群L1と第3レンズ群L3は一定間隔を保って一緒に移動する。第4レンズ群L4は同時にフォーカス群である。図1は、ズーミング軌跡と収納時の軌跡の両方を描いている。なお、厳密には、バリフォーカスレンズ系は変倍に伴って焦点移動が生じるレンズ系、ズームレンズ系は焦点移動が生じないレンズ系として定義されているが、本実施形態では、上記バリフォーカルレンズ系をズームレンズ系の一種として扱い、さらに以下の説明では上記バリフォーカルレンズ系をズームレンズ系と呼ぶ。   First, a zoom lens optical system to which the zoom lens barrel according to the present embodiment is applied will be described with reference to FIG. The zoom lens system includes, in order from the object side, a first lens unit L1 having a positive power, a second lens unit L2 having a negative power, a third lens unit L3 having a positive power, and a fourth lens unit having a positive power. This is a varifocal lens system composed of L4. The zooming is performed by the first to third lens units L1 to L3, and the focus movement accompanying the zooming is corrected by the fourth lens unit L4. During zooming, the first lens unit L1 and the third lens unit L3 move together at a constant interval. The fourth lens unit L4 is a focus group at the same time. FIG. 1 illustrates both the zooming locus and the locus during storage. Strictly speaking, the varifocal lens system is defined as a lens system in which the focal point moves with zooming, and the zoom lens system is defined as a lens system in which the focal point does not move. The varifocal lens system is referred to as a zoom lens system in the following description.

図1から図19について、本実施形態のズームレンズ鏡筒の全体構造を説明する。カメラボディに固定される固定筒11には、例えば図8に示すように、その内周面に雌ヘリコイド11aと、光軸と平行な方向の直進案内溝11bとが形成されている。この固定筒11の雌ヘリコイド11aには、図9に示すように、カムヘリコイド環12の後端部に形成した雄ヘリコイド12aが螺合する。雄ヘリコイド12aの山部には平歯車12bが形成されており、この平歯車12bが、固定筒11の内面凹部11c(図3)に位置させて回動自在に支持した駆動ピニオン13(図15参照)と常時噛み合う。従って、カムヘリコイド環12は、駆動ピニオン13及び平歯車12bを介して回動すると、雄ヘリコイド12aと雌ヘリコイド11aに従って光軸方向に移動する。本実施形態のズームレンズ鏡筒は、このカムヘリコイド環12が光軸を中心とする唯一の回動部材である。   1 to 19, the entire structure of the zoom lens barrel according to the present embodiment will be described. As shown in, for example, FIG. 8, the fixed cylinder 11 fixed to the camera body has a female helicoid 11a on its inner peripheral surface and a straight guide groove 11b in a direction parallel to the optical axis. As shown in FIG. 9, a male helicoid 12a formed at the rear end of the cam helicoid ring 12 is screwed into the female helicoid 11a of the fixed cylinder 11. A spur gear 12b is formed at the peak of the male helicoid 12a, and the spur gear 12b is positioned in an inner surface recess 11c (FIG. 3) of the fixed cylinder 11 and is rotatably supported by a drive pinion 13 (FIG. 15). (See)). Therefore, when the cam helicoid ring 12 rotates via the drive pinion 13 and the spur gear 12b, it moves in the optical axis direction according to the male helicoid 12a and the female helicoid 11a. In the zoom lens barrel of the present embodiment, the cam helicoid ring 12 is the only rotating member about the optical axis.

カムヘリコイド環12の外周には、直進案内環14が嵌まっている。この直進案内環14はその後端部外面に径方向の直進案内突起14aを有し、後端部の内面にバヨネット突起14b(図4)を有する。直進案内突起14aは、固定筒11の直進案内溝11bに相対移動自在に嵌まっており、バヨネット突起14bは、カムヘリコイド環12の雄ヘリコイド12a(平歯車12b)の直前に形成した周方向溝12cに相対回転自在に嵌まっている。従って直進案内環14は、回転せずに光軸方向にカムヘリコイド環12と一緒に移動する。   A rectilinear guide ring 14 is fitted on the outer periphery of the cam helicoid ring 12. The rectilinear guide ring 14 has a radial rectilinear guide protrusion 14a on the outer surface of its rear end, and a bayonet protrusion 14b (FIG. 4) on the inner surface of the rear end. The rectilinear guide projection 14a is relatively movably fitted in the rectilinear guide groove 11b of the fixed cylinder 11, and the bayonet protrusion 14b is a circumferential groove formed immediately before the male helicoid 12a (spur gear 12b) of the cam helicoid ring 12. 12c is relatively rotatably fitted. Therefore, the rectilinear guide ring 14 moves together with the cam helicoid ring 12 in the optical axis direction without rotating.

カムヘリコイド環12の外周面には、図4、図9、図16に示すように、第1レンズ群L1を支持した1群移動筒15用のカム溝C15と、飾り筒16用のカム溝C16が形成されており、内周面には、第2レンズ群L2を支持した2群移動筒17用のカム溝C17(図19参照)が形成されている。1群用カム溝C15と飾り筒用カム溝C16は僅かに形状が相違し、それぞれ周方向に離隔させて3本ずつ形成され、2群用カム溝C17は同一基礎軌跡が周方向及び光軸方向に離隔させて6本形成されている。1群移動筒15、飾り筒16、2群移動筒17はそれぞれ光軸方向に直進案内されており、これらの1群用カム溝C15、飾り筒用カム溝C16、2群用カム溝C17に従って、カムヘリコイド環12の回転に伴って光軸方向に進退する。   On the outer peripheral surface of the cam helicoid ring 12, as shown in FIGS. 4, 9, and 16, a cam groove C15 for the first group moving barrel 15 supporting the first lens group L1, and a cam groove for the decorative barrel 16 are provided. C16 is formed, and a cam groove C17 (see FIG. 19) for the second group moving cylinder 17 supporting the second lens group L2 is formed on the inner peripheral surface. The first group cam groove C15 and the decorative cylinder cam groove C16 have slightly different shapes and are each formed three in the circumferential direction so as to be spaced apart from each other. The second group cam groove C17 has the same basic trajectory in the circumferential direction and the optical axis. Six are formed apart from each other in the direction. The first group moving cylinder 15, the decoration cylinder 16, and the second group moving cylinder 17 are respectively guided in a straight line in the optical axis direction, and follow the first group cam groove C15, the decoration cylinder cam groove C16, and the second group cam groove C17. The cam helicoid ring 12 advances and retreats in the optical axis direction with rotation.

これらの直進案内関係を説明する。1群移動筒15は、図4、図5に示すように、外筒15X、内筒15Y及びこの外筒15Xと内筒15Yの先端部を接続したフランジ壁15Zを有する断面コ字状をなしており、外筒15Xと内筒15Yの間に、カムヘリコイド環12が位置している。外筒15Xの後端部には、カムヘリコイド環12の1群用カム溝C15に嵌まるカムフォロア15aが固定されている。内筒15Yの先端部には、図8、図9に示すように、第1レンズ群L1を固定した1群枠24が螺合固定されている。1群枠24は、第1レンズ群L1を光軸方向に位置調整してズーミング調整する際に用いることができる。   The following describes the straight-ahead guidance relationship. As shown in FIGS. 4 and 5, the first-group moving cylinder 15 has a U-shaped cross section including an outer cylinder 15X, an inner cylinder 15Y, and a flange wall 15Z connecting the outer cylinder 15X and the distal end of the inner cylinder 15Y. The cam helicoid ring 12 is located between the outer cylinder 15X and the inner cylinder 15Y. A cam follower 15a that fits into the first group cam groove C15 of the cam helicoid ring 12 is fixed to the rear end of the outer cylinder 15X. As shown in FIGS. 8 and 9, a first group frame 24 to which the first lens unit L1 is fixed is screwed and fixed to the distal end of the inner cylinder 15Y. The first group frame 24 can be used when performing zooming adjustment by adjusting the position of the first lens unit L1 in the optical axis direction.

固定筒11に直進案内されている直進案内環14の内周面には、光軸と平行な直進案内溝14c(図9)が略120゜間隔で形成されており、この直進案内溝14cに、外筒15Xの後端部から径方向に突出させた直進案内突起15bが嵌まっている。1群移動筒15の外筒15Xには、組立用溝15cの後端部に幅の狭い直進案内溝15d(図16)が形成されており、この直進案内溝15dに、外筒15Xと直進案内環14の間に位置する飾り筒16に固定した直進案内キー16aが位置している。1群移動筒15と飾り筒16の光軸方向の相対移動距離(1群用カム溝C15と飾り筒用カム溝C16の形状の違い)は、僅かであり、直進案内溝15dの光軸方向の長さもこれに対応して短い。直進案内キー16aには一体に、飾り筒用カム溝C16に嵌まるカムフォロア16bが設けられている。   Straight guide grooves 14c (FIG. 9) parallel to the optical axis are formed on the inner peripheral surface of the straight guide ring 14 guided straight to the fixed cylinder 11 at approximately 120 ° intervals. A linear guide projection 15b radially projecting from the rear end of the outer cylinder 15X is fitted. A narrow straight guide groove 15d (FIG. 16) is formed at the rear end of the assembling groove 15c in the outer cylinder 15X of the first group movable barrel 15, and the straight guide groove 15d is formed to move straight with the outer cylinder 15X. A straight guide key 16a fixed to the decoration tube 16 located between the guide rings 14 is located. The relative movement distance in the optical axis direction between the first group moving cylinder 15 and the decoration cylinder 16 (the difference in the shape of the first group cam groove C15 and the decoration cylinder cam groove C16) is small, and the optical axis direction of the straight guide groove 15d. Is correspondingly short. The straight guide key 16a is integrally provided with a cam follower 16b fitted into the decorative cylinder cam groove C16.

1群移動筒15と飾り筒16との間には、圧縮コイルばね19(図3から図5参照)が挿入されている。この圧縮コイルばね19は、1群移動筒15を後方に、飾り筒16を前方に移動付勢して、1群用カム溝C15とカムフォロア15aの間、及び飾り筒用カム溝C16とカムフォロア16bの間のバックラッシュをとる作用をする。   A compression coil spring 19 (see FIGS. 3 to 5) is inserted between the first-group moving cylinder 15 and the decoration cylinder 16. The compression coil spring 19 urges the first group moving cylinder 15 rearward and the decoration cylinder 16 forward to move the first group moving cylinder 15 between the first group cam groove C15 and the cam follower 15a, and between the first group cam groove C15 and the cam follower 16b. It acts to take backlash between.

また、1群用カム溝C15と飾り筒用カム溝C16は、図16に示すように、撮影位置と比較して収納位置においては飾り筒16を1群移動筒15に対して前方に出し、バリアブロック30(図8)のバリアと第1レンズ群L1との干渉を防ぐように僅かに形状を異ならせて設定されている。より詳細には、図16に示すように、1群用カム溝C15と飾り筒用カム溝C16の光軸方向距離Qは、準備区間(収納位置からバリアが全開するまでの区間)の方がズーム区間(ワイド端位置からテレ端位置の区間)より大きくなるように1群用カム溝C15と飾り筒用カム溝C16の形状が設定されている。即ち、準備区間では全区間においてQ=Q1であるが、バリア全開位置OP1を所定量通過した位置OP2(すなわち、レンズL1とバリアとが干渉しない位置から)から、上記距離Qは徐々に小さくなり、ワイド端位置においてQ=Q2(<Q1)となる。そしてズーム区間では、その全区間においてQ=Q2となる。図3に示す収納位置において、1群移動筒15の前端部のフランジ壁15Zと、その前方に位置する飾り筒16のフランジ壁との間のクリアランスc1は、図4または図5に示す撮影状態における両フランジ壁間のクリアランスよりも大きく形成されているのが分かる。別言すると、撮影位置においては、バリアブロック30を第1レンズ群L1に接近させることで、バリアブロック30によるケラレを防止している。バリアブロック30は、飾り筒16の前端部に支持されており、該バリアブロック30のすぐ後方に位置させたバリア開閉環31(図9)を収納位置近傍においてカムヘリコイド環12によって回転させることで、バリアの開閉を行う。このようなバリア開閉環31の回転運動でバリアブロック30の開閉を行うバリア機構は周知である。なお、本実施形態では、ズーム区間において距離Qを一定の値(=Q2)となるように1群用カム溝C15と飾り筒用カム溝C16の形状を設定しているが、焦点距離に応じて距離Qが変化するようにしてもよく、準備区間における距離Qよりもズーム区間における距離Qを大きくなるように構成してもよい。   Also, as shown in FIG. 16, the first group cam groove C15 and the decorative cylinder cam groove C16 project the decorative cylinder 16 forward with respect to the first group moving cylinder 15 at the storage position compared to the photographing position. The shape is set slightly different so as to prevent interference between the barrier of the barrier block 30 (FIG. 8) and the first lens unit L1. More specifically, as shown in FIG. 16, the optical axis direction distance Q between the first group cam groove C15 and the decorative cylinder cam groove C16 is greater in the preparation section (the section from the storage position to the full opening of the barrier). The shapes of the first group cam groove C15 and the decorative cylinder cam groove C16 are set so as to be larger than the zoom section (the section from the wide end position to the tele end position). That is, in the preparation section, Q = Q1 in all sections, but the distance Q gradually decreases from the position OP2 that has passed the barrier full-open position OP1 by a predetermined amount (that is, from the position where the lens L1 does not interfere with the barrier). , Q = Q2 (<Q1) at the wide end position. Then, in the zoom section, Q = Q2 in all the sections. In the storage position shown in FIG. 3, the clearance c1 between the flange wall 15Z at the front end of the first-group moving barrel 15 and the flange wall of the decorative barrel 16 located in front of it is in the photographing state shown in FIG. 4 or FIG. It can be seen that the gap is formed larger than the clearance between the two flange walls in FIG. In other words, at the photographing position, the barrier block 30 is moved closer to the first lens unit L1 to prevent vignetting by the barrier block 30. The barrier block 30 is supported by the front end of the decoration tube 16. By rotating the barrier opening / closing ring 31 (FIG. 9) located immediately behind the barrier block 30 by the cam helicoid ring 12 near the storage position. , Open and close the barrier. A barrier mechanism that opens and closes the barrier block 30 by the rotation of the barrier opening / closing ring 31 is well known. In the present embodiment, the shapes of the first group cam groove C15 and the decorative cylinder cam groove C16 are set so that the distance Q becomes a constant value (= Q2) in the zoom section. Alternatively, the distance Q may be changed so that the distance Q in the zoom section is larger than the distance Q in the preparation section.

また、飾り筒用カム溝C16は、その前端部が開放されており、飾り筒16のカムフォロア16bは、特定の組立位置において、その開放端C16a(図16)から該カム溝C16内に挿入される。1群用カム溝C15についても、同様に前端開放端C15aから1群移動筒15のカムフォロア15aが挿入される。   The decorative tube cam groove C16 has an open front end, and the cam follower 16b of the decorative tube 16 is inserted into the cam groove C16 from its open end C16a (FIG. 16) at a specific assembly position. You. Similarly, the cam follower 15a of the first-group moving cylinder 15 is inserted into the first-group cam groove C15 from the front-end open end C15a.

1群移動筒15の内筒15Yには、その内周面に光軸と平行な方向の直進案内突起15f(図6、図7)が形成されており、2群移動筒17には、この直進案内突起15fが相対摺動自在に嵌まる光軸と平行な方向の直進案内溝17aが形成されている。直進案内突起15fにはその中心部に、光軸と平行な方向の吊り溝15eが形成されており、この吊り溝15eの後端部は閉じられている(図17、図18参照)。2群移動筒17には、カムヘリコイド環12の2群用カム溝C17に嵌まるカムフォロア17cが形成されている。   The inner cylinder 15Y of the first group moving cylinder 15 is formed with a straight guide protrusion 15f (FIGS. 6 and 7) in a direction parallel to the optical axis on its inner peripheral surface. A rectilinear guide groove 17a is formed in a direction parallel to the optical axis in which the rectilinear guide protrusion 15f is slidably fitted. A suspension groove 15e in a direction parallel to the optical axis is formed at the center of the straight guide projection 15f, and the rear end of the suspension groove 15e is closed (see FIGS. 17 and 18). The second group moving cylinder 17 is formed with a cam follower 17c that fits into the second group cam groove C17 of the cam helicoid ring 12.

2群移動筒17の内周には、第3レンズ群L3を支持した3群移動筒18が位置している。この3群移動筒18には、2群移動筒17の直進案内溝17aに内側から相対摺動自在に嵌まる光軸と平行な直進案内突起18aが形成されている。この直進案内突起18aの中心部には、吊り溝15eに嵌まる直進キー18b(図11、図17、図18)が形成されている。図11に示すように、3群移動筒18には、第3レンズ群L3の前方に位置させてシャッタブロック20が挿入され、抑え環20aで固定されている。そして、この3群移動筒18(抑え環20a)と2群移動筒17との間には、圧縮コイルばね21が挿入されていて、常時、2群移動筒17に対して3群移動筒18を後方に移動付勢している。この3群移動筒18の後方への移動端は、直進キー18bが1群移動筒15の吊り溝15eの後端部に当接する位置で規制される。すなわち、撮影状態においては、直進キー18bが1群移動筒15の吊り溝15eの後端部に当接した状態が維持され、第1レンズ群L1と第3レンズ群L3との相対間隔が一定となる。ズームレンズ鏡筒が撮影状態から収納状態へ変化する際には、第3レンズ群L3(3群移動筒18)が機械的な後退端に達した後、第1レンズ群L1が1群用カム溝C15に従ってさらに後退すると、圧縮コイルばね21が撓んで第1レンズ群L1が第3レンズ群L3に接近する(図1参照)。直進キー18bは頭部が膨らんでいて、吊り溝15eからの脱落が防止されている。   On the inner circumference of the second group moving barrel 17, a third group moving barrel 18 supporting the third lens unit L3 is located. The third-group moving barrel 18 has a straight-moving guide projection 18a that is parallel to the optical axis and is fitted into the straight-moving guide groove 17a of the second-group moving barrel 17 so as to be relatively slidable from the inside. A linear key 18b (FIGS. 11, 17, and 18) that fits into the suspension groove 15e is formed at the center of the linear guide protrusion 18a. As shown in FIG. 11, a shutter block 20 is inserted into the third group moving barrel 18 in front of the third lens unit L3, and is fixed by a holding ring 20a. A compression coil spring 21 is inserted between the third group moving cylinder 18 (holding ring 20 a) and the second group moving cylinder 17. To move backward. The rearward moving end of the third group moving barrel 18 is regulated at a position where the straight key 18b contacts the rear end of the hanging groove 15e of the first group moving barrel 15. That is, in the photographing state, the state in which the straight key 18b is in contact with the rear end of the suspension groove 15e of the first group moving barrel 15 is maintained, and the relative distance between the first lens group L1 and the third lens group L3 is constant. It becomes. When the zoom lens barrel changes from the photographing state to the housed state, after the third lens group L3 (the third group moving cylinder 18) reaches the mechanical retreat end, the first lens group L1 is moved to the first group cam. When the compression coil spring 21 is further retracted according to the groove C15, the first lens unit L1 approaches the third lens unit L3 (see FIG. 1). The head of the rectilinear key 18b is swollen to prevent the straight key 18b from falling out of the suspension groove 15e.

圧縮コイルばね21は、直接2群移動筒17に作用させてもよい(第2レンズ群L2は2群移動筒17に固定してもよい)が、図示実施形態では、収納長の一層の短縮を図るため、2群移動筒17に対して第2レンズ群L2を後退可能としている。図12、図13はその構成を示すもので、2群移動筒17には、先端部に内方フランジ17dを有する筒状部17eが形成されており、この筒状部17eには光軸と平行で後端及び前端が開放された直進案内溝17fが、周方向に等角度間隔で3本形成されている。筒状部17eには、中間筒部材25に形成したフランジ部25aが嵌っており、フランジ部25aの外周面に周方向に等角度間隔で突設した径方向外向きの3本の案内突起25dが、対応する直進案内溝17fに後方からそれぞれ嵌められている。このため、中間筒部材25は2群移動筒17に対して、光軸回りの相対回転が規制され、光軸方向にのみ相対移動可能であり、フランジ部25aの前面が内方フランジ17dの後面に当接するまで前方へ移動できる。第2レンズ群L2は、2群枠26に固定されており、この2群枠26の雄ねじ26bが中間筒部材25の内周に形成された雌ねじ25eに螺合されている。従って、光軸回りの回転が規制された中間筒部材25に対して2群枠26を回転させることで、第2レンズ群L2の光軸方向の位置を調整(ズーミング調整)することができ、調整後は、接着剤穴25bから接着剤を滴下することで、2群枠26を中間筒部材25に固定することができる。2群移動筒17の内方フランジ17dの前端面と2群枠26の外方フランジ26aとの間には、調整代を含めた隙間c2(図13)が存在する。圧縮コイルばね21は、中間筒部材25に作用しており、常時は(撮影状態では)、中間筒部材25はフランジ部25aが内方フランジ17dに当接する位置に保持される。つまり、第2レンズ群L2の位置は撮影状態では2群用カム溝C17によって制御される一方、収納時には、2群枠26が1群枠24の後端によって機械的に後方に押されることで、外方フランジ26aが内方フランジ17dに当接する位置まで後退でき、隙間c2分収納長の短縮ができる。   The compression coil spring 21 may act directly on the second-group moving barrel 17 (the second lens group L2 may be fixed to the second-group moving barrel 17), but in the illustrated embodiment, the storage length is further reduced. In order to achieve the above, the second lens unit L2 can be moved backward with respect to the second unit moving barrel 17. FIGS. 12 and 13 show the configuration. The second-group moving barrel 17 is formed with a tubular part 17e having an inner flange 17d at the distal end. The tubular part 17e has an optical axis and Three straight guide grooves 17f which are parallel and open at the rear and front ends are formed at equal angular intervals in the circumferential direction. A flange portion 25a formed on the intermediate tubular member 25 is fitted in the cylindrical portion 17e, and three radially outward guide projections 25d projecting from the outer peripheral surface of the flange portion 25a at equal angular intervals in the circumferential direction. Are respectively fitted in the corresponding straight guide grooves 17f from behind. For this reason, the relative rotation of the intermediate cylinder member 25 around the optical axis with respect to the second group movable cylinder 17 is restricted, and the intermediate cylinder member 25 can move only in the optical axis direction, and the front surface of the flange portion 25a is the rear surface of the inner flange 17d. Can move forward until it abuts. The second lens group L2 is fixed to the second group frame 26, and the male screw 26b of the second group frame 26 is screwed into the female screw 25e formed on the inner periphery of the intermediate cylindrical member 25. Therefore, by rotating the second lens group frame 26 with respect to the intermediate cylinder member 25 whose rotation about the optical axis is restricted, the position of the second lens unit L2 in the optical axis direction can be adjusted (zooming adjustment). After the adjustment, the second group frame 26 can be fixed to the intermediate cylindrical member 25 by dropping the adhesive from the adhesive hole 25b. A gap c2 (FIG. 13) including an adjustment margin exists between the front end face of the inner flange 17d of the second group moving cylinder 17 and the outer flange 26a of the second group frame 26. The compression coil spring 21 acts on the intermediate cylinder member 25, and the intermediate cylinder member 25 is normally held at a position where the flange portion 25a is in contact with the inner flange 17d (in a photographing state). That is, the position of the second lens group L2 is controlled by the second group cam groove C17 in the photographing state, while the second group frame 26 is mechanically pushed rearward by the rear end of the first group frame 24 during storage. The outer flange 26a can be retracted to a position where it contacts the inner flange 17d, and the storage length can be reduced by the gap c2.

中間筒部材25には、遮光枠27が支持されている。遮光枠27は、環状の遮光部27aと、この環状遮光部27aから略120゜間隔で前方に延びる保持脚27bと、保持脚27bの先端部を外方に曲折した抜け止めフック部27cとを有しており、中間筒部材25には、この抜け止めフック部27cが嵌まる遮光部材保持穴25cが形成されている(図12)。そして、遮光枠27と2群枠26の間には、円錐コイルばね28が挿入されていて、遮光枠27を常時後方に移動付勢している。この遮光枠27は、鏡筒を収納するとき、遮光枠27が機械的な後退端に達すると、円錐コイルばね28を撓ませて2群枠26に接近する。遮光部材保持穴25cの光軸方向長は、環状遮光部27aが第2レンズ群L2に当接できるように設定されている。   The light shielding frame 27 is supported by the intermediate cylindrical member 25. The light-shielding frame 27 includes an annular light-shielding portion 27a, a holding leg 27b extending forward from the annular light-shielding portion 27a at an interval of approximately 120 °, and a retaining hook portion 27c obtained by bending the tip of the holding leg 27b outward. The light blocking member holding hole 25c into which the retaining hook portion 27c fits is formed in the intermediate cylindrical member 25 (FIG. 12). A conical coil spring 28 is inserted between the light-shielding frame 27 and the second group frame 26 to constantly move and bias the light-shielding frame 27 backward. When the light-blocking frame 27 reaches the mechanically retracted end when the lens barrel is stored, the light-blocking frame 27 approaches the second group frame 26 by bending the conical coil spring 28. The length of the light shielding member holding hole 25c in the optical axis direction is set so that the annular light shielding portion 27a can abut on the second lens group L2.

円錐コイルばね28はさらに、2群枠26を回転させて行うズーミング調整時のバックラッシュ取りの作用をする。ズーミング調整は、画像位置を観察しながら、第2レンズ群L2の光軸方向位置を調整して行う調整であり、2群枠26の中間筒部材25(2群移動筒17)に対するバックラッシュを除去することにより、正確な調整ができる。   The conical coil spring 28 also functions to remove backlash during zooming adjustment performed by rotating the second group frame 26. The zooming adjustment is an adjustment performed by adjusting the position of the second lens unit L2 in the optical axis direction while observing the image position. The backlash of the second group frame 26 with respect to the intermediate cylinder member 25 (the second group moving cylinder 17) is reduced. By removing, accurate adjustment can be made.

第4レンズ群L4は4群枠22に固定されている。第4レンズ群L4は前述のように、バリフォーカルレンズ系の焦点移動を補正する役割と、フォーカスレンズ群としての役割をもっており、パルスモータ23によって進退制御される。すなわち、パルスモータ23の駆動軸はねじ軸23aであり、このねじ軸23aに回転を規制されたナット部材23bが螺合している。ナット部材23bは、ばね手段Sによって、常時4群枠22の足部22aに当接する方向に移動付勢されており、4群枠22は、ガイドバー22bによって回転を規制されている。よって、パルスモータ23を駆動すると、4群枠22(第4レンズ群L4)が光軸方向に進退する。パルスモータ23は、焦点距離情報及び被写体距離情報に応じて制御される。   The fourth lens unit L4 is fixed to the fourth unit frame 22. As described above, the fourth lens unit L4 has a role of correcting the focal point movement of the varifocal lens system and a role of a focus lens unit, and is controlled by the pulse motor 23 to move forward and backward. That is, the drive shaft of the pulse motor 23 is the screw shaft 23a, and the nut member 23b whose rotation is restricted is screwed to the screw shaft 23a. The nut member 23b is constantly urged by the spring means S to move in the direction in which it comes into contact with the foot 22a of the fourth group frame 22, and the rotation of the fourth group frame 22 is restricted by the guide bar 22b. Therefore, when the pulse motor 23 is driven, the fourth group frame 22 (the fourth lens group L4) moves forward and backward in the optical axis direction. The pulse motor 23 is controlled according to the focal length information and the subject distance information.

従って、上記構成の本ズームレンズ鏡筒は、駆動ピニオン13を介してカムヘリコイド環12を回転させると、直進案内されている1群移動筒15、飾り筒16、2群移動筒17がカム溝C15、C16、C17に従って光軸方向に移動する。3群移動筒18は、1群移動筒15が収納位置から前進して直進キー18bが吊り溝15eの後端部に当接すると、1群移動枠15と一緒に移動する。また第4レンズ群L4は焦点距離情報に応じて制御されるパルスモータ23によって位置制御され、バリフォーカルレンズ系の焦点移動の補正が行われる。その結果、図1のようなズーミング軌跡が得られる。また、パルスモータ23は、被写体距離情報によっても制御され、フォーカシング動作が実行される。   Therefore, when the cam helicoid ring 12 is rotated via the drive pinion 13 in the present zoom lens barrel having the above-described structure, the first group moving cylinder 15, the decoration cylinder 16, and the second group moving cylinder 17 that are guided in a straight line form the cam groove. It moves in the optical axis direction according to C15, C16, and C17. The third group moving barrel 18 moves together with the first group moving frame 15 when the first group moving barrel 15 moves forward from the storage position and the rectilinear key 18b abuts on the rear end of the hanging groove 15e. The position of the fourth lens unit L4 is controlled by the pulse motor 23 controlled according to the focal length information, and the focal movement of the varifocal lens system is corrected. As a result, a zooming locus as shown in FIG. 1 is obtained. The pulse motor 23 is also controlled by subject distance information, and executes a focusing operation.

このように本実施形態では、回転駆動されるカムヘリコイド環(カム環)12の外周側に、第1レンズ群L1を支持する1群移動筒(第1レンズ群枠)15と飾り筒(遮光飾り筒)16とを配置している。1群移動筒15は、カムヘリコイド環12の外側に位置する外筒15X、カムヘリコイド環12の内側に位置する内筒15Y及び外筒15Xと内筒15Yの先端部を接続するフランジ壁15Zとを具備しており、1群移動筒15と飾り筒16の間には圧縮コイルばね(ばね手段)19が縮設されている。さらに、カムヘリコイド環12の外周面に形成されたカム溝(レンズ群枠用カム溝)C15に1群移動筒15のカムフォロア15aを嵌合し、1群移動筒15を直進案内環14で直進案内している。また、飾り筒16の直進案内キー16aが1群移動筒15の直進案内溝15d内に位置し、直進案内キー16aに設けたカムフォロア16bを、カムヘリコイド環12の外周面に形成されたカム溝(飾り筒用カム溝)C16に嵌合し、飾り筒16を1群移動筒15で直進案内している。そして、図16に示すように、ズームレンズの撮影領域(ズーミング領域)では、カム溝C15とカム溝C16は同一形状となっているので、撮影領域では、飾り筒16は1群移動筒15と同一の軌跡で光軸方向に移動して、1群移動筒15を保護すると共に、1群移動筒15の剛性を補強する。また、飾り筒16を直進案内する機構としては、1群移動筒15に比較的短い長さの直進案内溝15dを設けるだけで済むので、ズームレンズ鏡筒の光軸方向寸法の小型化(薄型化)が図れる。   As described above, in the present embodiment, the first group moving barrel (first lens group frame) 15 supporting the first lens group L1 and the decorative barrel (light shielding) are provided on the outer peripheral side of the cam helicoid ring (cam ring) 12 which is driven to rotate. (Decorative tube) 16 are arranged. The first group moving cylinder 15 includes an outer cylinder 15X located outside the cam helicoid ring 12, an inner cylinder 15Y located inside the cam helicoid ring 12, and a flange wall 15Z connecting the outer cylinder 15X and a tip end of the inner cylinder 15Y. And a compression coil spring (spring means) 19 is contracted between the first group moving cylinder 15 and the decoration cylinder 16. Further, the cam follower 15a of the first group moving barrel 15 is fitted into a cam groove (cam groove for lens group frame) C15 formed on the outer peripheral surface of the cam helicoid ring 12, and the first group moving barrel 15 is moved straight by the straight guide ring 14. I'm guiding you. The straight guide key 16a of the decoration barrel 16 is located in the straight guide groove 15d of the first group moving barrel 15, and the cam follower 16b provided on the straight guide key 16a is connected to the cam groove formed on the outer peripheral surface of the cam helicoid ring 12. (Cam groove for decorative cylinder) The decorative cylinder 16 is fitted into the decorative cylinder C16, and is guided straight by the first group movable cylinder 15. Then, as shown in FIG. 16, in the photographing area (zooming area) of the zoom lens, the cam groove C15 and the cam groove C16 have the same shape. By moving in the optical axis direction along the same locus, the first group moving cylinder 15 is protected and the rigidity of the first group moving cylinder 15 is reinforced. Further, as a mechanism for guiding the decoration barrel 16 in a straight line, only the relatively short length of the straight movement guide groove 15d needs to be provided in the first-group moving barrel 15, so that the size of the zoom lens barrel in the optical axis direction can be reduced (thin). ) Can be achieved.

さらに、収納領域ではカム溝15とカム溝C16の形状は異なっており、収納領域では撮影領域に比べて、飾り筒16を1群移動筒15に対して前方に移動させて、飾り筒16で支持したバリアが第1レンズ群L1に接触しないようにしている。   Further, in the storage area, the shapes of the cam groove 15 and the cam groove C16 are different, and in the storage area, the decorative cylinder 16 is moved forward with respect to the first group moving cylinder 15 as compared with the photographing area. The supported barrier does not contact the first lens unit L1.

また、外筒15Xと内筒15Yには、径方向に重合する調整用孔(開口)15X1、15Y1をそれぞれ穿設してあり(図4及び図8から図10参照)、飾り筒16をカムヘリコイド環12に取り付ける前に(飾り筒16で1群移動筒15の外周面を覆う前に)、図4に示すように、1群移動筒15と2群移動筒17をワイド端まで移動させて、1群移動筒15の調整用孔15X1、15Y1に図示を省略した工具を挿入し、この工具により、中間筒部材25に対して2群枠26を回転させることで、第2レンズ群L2の光軸方向の位置を調整(ズーミング調整)することができ、調整後、接着剤穴25bから接着剤を滴下することで、2群枠26を中間筒部材25に固定できる。   Adjustment holes (openings) 15X1 and 15Y1 that overlap in the radial direction are formed in the outer cylinder 15X and the inner cylinder 15Y (see FIGS. 4 and 8 to 10). Before attaching to the helicoid ring 12 (before covering the outer peripheral surface of the first-group moving cylinder 15 with the decorative cylinder 16), the first-group moving cylinder 15 and the second-group moving cylinder 17 are moved to the wide end as shown in FIG. Then, a tool (not shown) is inserted into the adjustment holes 15X1 and 15Y1 of the first-group moving barrel 15, and the second-group frame 26 is rotated with respect to the intermediate barrel member 25 by this tool, whereby the second lens group L2 The position in the optical axis direction can be adjusted (zooming adjustment), and after the adjustment, the second group frame 26 can be fixed to the intermediate cylindrical member 25 by dropping the adhesive through the adhesive hole 25b.

上述したように本実施形態の飾り筒16は、1群移動筒15に設けた調整用孔15X1、15Y1を覆い隠す遮光機能だけでなく、第1移動筒15のバックラッシュを除去する機能、バリアブロック30を支持する機能、及び、収納時に撮影時よりも1群移動筒15に対して前方に移動することによりバリアと第1レンズ群L1の接触を防止する機能をも具備しており、従来の飾り筒16に比べて多くの機能を具備するものとなっている。   As described above, the decorative cylinder 16 of the present embodiment has not only a light-shielding function of covering the adjustment holes 15X1 and 15Y1 provided in the first-group moving cylinder 15 but also a function of removing backlash of the first moving cylinder 15 and a barrier. It has a function of supporting the block 30 and a function of preventing contact between the barrier and the first lens unit L1 by moving forward with respect to the first-group moving barrel 15 during storage when compared to when shooting. It has more functions than the decorative cylinder 16 of FIG.

本発明のズームレンズの鏡筒構造は、カム環がヘリコイドカム環であると否とを問わず、カム環とレンズ支持筒を有するズームレンズ鏡筒一般に適用できるのは明らかである。   It is clear that the lens barrel structure of the zoom lens of the present invention can be applied to a general zoom lens barrel having a cam ring and a lens support cylinder, regardless of whether the cam ring is a helicoid cam ring.

本発明によるズームレンズ鏡筒を適用するズームレンズ系のズーミング基礎軌跡を示す図である。FIG. 3 is a diagram illustrating a basic zooming locus of a zoom lens system to which the zoom lens barrel according to the present invention is applied. 同ズームレンズ系の構成レンズ群とそのレンズ枠を示す半切斜視図である。FIG. 2 is a half-cut perspective view showing constituent lens groups and the lens frame of the zoom lens system. 本発明の一実施形態によるズームレンズ鏡筒の収納状態における上半断面図である。FIG. 2 is an upper half cross-sectional view of the zoom lens barrel in a housed state according to an embodiment of the present invention. 同ズームレンズ鏡筒のワイド端無限遠撮影状態における上半断面図である。FIG. 3 is an upper half cross-sectional view of the zoom lens barrel in a wide-angle infinity shooting state. 同ズームレンズ鏡筒のテレ端無限遠撮影状態における下半断面図である。FIG. 3 is a lower half cross-sectional view of the zoom lens barrel in a telephoto infinity shooting state. 図3のVI-VI線に沿う断面図である。FIG. 6 is a sectional view taken along the line VI-VI of FIG. 3. 図3のVII-VII線に沿う断面図である。FIG. 7 is a sectional view taken along line VII-VII in FIG. 3. 同ズームレンズ鏡筒の一部の分解斜視図である。FIG. 3 is an exploded perspective view of a part of the zoom lens barrel. 同別の部分の分解斜視図である。It is an exploded perspective view of another part. 1群移動筒回りの分解斜視図である。FIG. 4 is an exploded perspective view around the first group moving cylinder. 3群移動筒回りの分解斜視図である。FIG. 10 is an exploded perspective view around the third group moving cylinder. 2群移動筒回りの分解斜視図である。It is an exploded perspective view around the 2nd group moving cylinder. 2群移動筒回りの上半断面図である。It is an upper half sectional view around a 2nd group moving cylinder. 固定筒に支持するパルスモータ回りの背面から見た分解斜視図である。It is the disassembled perspective view seen from the back surface around the pulse motor supported by the fixed cylinder. 同固定筒と第4レンズ群回りの分解斜視図である。FIG. 4 is an exploded perspective view around the fixed cylinder and a fourth lens group. カムヘリコイド筒の1群用カム溝と飾り筒用カム溝の展開図である。It is a development view of the cam groove for the 1st group of the cam helicoid cylinder, and the cam groove for the decoration cylinder. 1群移動筒、2群移動筒及び3群移動筒の直進案内関係を示す展開図である。It is a development view which shows the linear guidance relationship of a 1st group moving cylinder, a 2nd group moving cylinder, and a 3rd group moving cylinder. 同拡大展開図である。FIG. カムヘリコイド環の2群用カム溝の形状を示す展開図である。It is a development view showing the shape of the cam groove for the 2nd group of the cam helicoid ring.

符号の説明Explanation of reference numerals

C15 1群用カム溝(レンズ群枠用カム溝)
C16 飾り筒用カム溝(飾り筒用カム溝)
C17 2群用カム溝
L1 第1レンズ群
L2 第2レンズ群
L3 第3レンズ群
L4 第4レンズ群
S ばね手段
11 固定筒
11a 雌ヘリコイド
11b 直進案内溝
11c 内面凹部
12 カムヘリコイド環(カム環)
12a 雄ヘリコイド
12b 平歯車
12c 周方向溝
12d 直進ガイド溝
13 駆動ピニオン
14 直進案内環
14a 直進案内突起
14b バヨネット突起
14c 直進案内溝
15 1群移動筒(第1レンズ群枠)
15a カムフォロア
15b 直進案内突起
15c 組立用溝
15d 直進案内溝
15e 吊り溝
15f 直進案内突起
15X 外筒
15X1 調整用孔(開口)
15Y 内筒
15Y1 調整用孔(開口)
15Z フランジ壁
16 飾り筒(遮光飾り筒)
16a 直進案内キー
16b カムフォロア
17 2群移動筒
17a 直進案内溝
17c カムフォロア
17d 内方フランジ
17e 筒状部
17f 直進案内溝
18 3群移動筒
18a 直進案内突起
18b 直進キー
19 圧縮コイルばね(ばね手段)
20 シャッタブロック
20a 抑え環
21 圧縮コイルばね
22 4群枠
22a 足部
22b ガイドバー
23 パルスモータ
23a ねじ軸
23b ナット部材
24 1群枠
25 中間筒部材
25a フランジ部
25b 接着剤穴
25c 遮光部材保持穴
25d 案内突起
25e 雌ねじ
26 2群枠
26a 外方フランジ
26b 雄ねじ
27 遮光枠
27a 環状遮光部
27b 保持脚
27c 抜け止めフック部
28 円錐コイルばね
30 バリアブロック
31 バリア開閉環


C15 1st group cam groove (lens group frame cam groove)
C16 Cam groove for decorative cylinder (Cam groove for decorative cylinder)
C17 2nd group cam groove L1 1st lens group L2 2nd lens group L3 3rd lens group L4 4th lens group S Spring means 11 Fixed cylinder 11a Female helicoid 11b Straight guide groove 11c Inner recess 12 Cam helicoid ring (cam ring)
12a Male helicoid 12b Spur gear 12c Circumferential groove 12d Linear guide groove 13 Drive pinion 14 Linear guide ring 14a Linear guide protrusion 14b Bayonet protrusion 14c Linear guide groove 15 First group moving cylinder (first lens group frame)
15a Cam follower 15b Linear guide projection 15c Assembly groove 15d Linear guide groove 15e Suspension groove 15f Linear guide projection 15X Outer cylinder 15X1 Adjustment hole (opening)
15Y Inner cylinder 15Y1 Adjustment hole (opening)
15Z Flange wall 16 Decorative tube (light shielding decorative tube)
16a linear guide key 16b cam follower 17 second group moving cylinder 17a linear guide groove 17c cam follower 17d inner flange 17e cylindrical portion 17f linear guide groove 18 third group movable cylinder 18a linear guide protrusion 18b linear key 19 compression coil spring (spring means)
Reference Signs List 20 shutter block 20a retaining ring 21 compression coil spring 22 fourth group frame 22a foot 22b guide bar 23 pulse motor 23a screw shaft 23b nut member 24 first group frame 25 intermediate cylindrical member 25a flange 25b adhesive hole 25c light shielding member holding hole 25d Guide projection 25e Female screw 26 Second group frame 26a Outer flange 26b Male screw 27 Light-shielding frame 27a Annular light-shielding portion 27b Holding leg 27c Retaining hook portion 28 Conical coil spring 30 Barrier block 31 Barrier opening / closing ring


Claims (5)

回転駆動されるカム環;
このカム環の外周に位置し光軸方向に直進案内された、ズームレンズ系の最も前方のレンズ群を支持する第1レンズ群枠;
この第1レンズ群枠の外周に位置する遮光飾り筒;及び
上記カム環の外周面に形成された、上記第1レンズ群枠に設けたカムフォロアと係合するレンズ群枠用カム溝と、上記遮光飾り筒に設けたカムフォロアと係合する飾り筒用カム溝;
を備え、
上記遮光飾り筒のカムフォロアは、第1レンズ群枠に形成した光軸と平行な直進案内溝を通って上記飾り筒用カム溝に係合しており、
上記レンズ群枠用カム溝と飾り筒用カム溝は、ズームレンズの撮影領域では、第1レンズ群枠と遮光飾り筒を同一の軌跡で光軸方向に移動させる形状をなしていることを特徴とするズームレンズの鏡筒構造。
Rotating cam ring;
A first lens group frame for supporting the foremost lens group of the zoom lens system, which is located on the outer periphery of the cam ring and guided straight in the optical axis direction;
A light-shielding decorative tube positioned on the outer periphery of the first lens group frame; and a lens group frame cam groove formed on the outer peripheral surface of the cam ring and engaged with a cam follower provided on the first lens group frame; A cam groove for a decorative cylinder to be engaged with a cam follower provided on the light-shielding decorative cylinder;
With
The cam follower of the light-shielding decorative tube is engaged with the decorative groove cam groove through a straight guide groove parallel to the optical axis formed in the first lens group frame,
The cam groove for the lens group frame and the cam groove for the decorative cylinder are shaped to move the first lens group frame and the light shielding decorative cylinder in the optical axis direction along the same locus in the photographing area of the zoom lens. The lens barrel structure of the zoom lens.
請求項1記載のズームレンズの鏡筒構造において、上記遮光飾り筒の前端部でバリアを支持するとともに、収納領域では撮影領域に比べて、
上記遮光飾り筒を第1レンズ群枠に対して前方に位置させて、収納領域で上記バリアを上記第1レンズ枠に支持されたレンズ群より前方に位置させたズームレンズの鏡筒構造。
In the lens barrel structure of the zoom lens according to claim 1, a barrier is supported at a front end of the light-shielding decorative barrel, and the storage area is smaller than the shooting area.
A lens barrel structure of a zoom lens in which the light-blocking decorative barrel is positioned forward with respect to the first lens group frame, and the barrier is positioned in the storage area ahead of the lens group supported by the first lens frame.
請求項1または2記載のズームレンズの鏡筒構造において、上記第1レンズ群枠は、外筒、内筒及び該外筒と内筒の先端部を接続したフランジ壁とを有し、この外筒と内筒との間にカム環が位置しているズームレンズの鏡筒構造。 3. The zoom lens barrel structure according to claim 1, wherein the first lens group frame has an outer cylinder, an inner cylinder, and a flange wall connecting the distal end of the outer cylinder and the inner cylinder. 4. A lens barrel structure of a zoom lens in which a cam ring is located between the barrel and the inner barrel. 請求項3記載のズームレンズの鏡筒構造において、第1レンズ群枠の内筒内面に、光軸方向に直進案内された第2レンズ群枠が支持されており、上記第1レンズ群枠には、この第2レンズ群枠に支持された第2レンズ群の光軸方向位置を調整するための開口が形成されているズームレンズの鏡筒構造。 4. The zoom lens barrel structure according to claim 3, wherein a second lens group frame guided straight in the optical axis direction is supported on the inner surface of the inner cylinder of the first lens group frame. Is a lens barrel structure of a zoom lens in which an opening for adjusting the position in the optical axis direction of the second lens group supported by the second lens group frame is formed. 請求項1ないし4のいずれか1項記載のズームレンズの鏡筒構造において、第1レンズ群枠と遮光飾り筒との間には、第1レンズ群枠に対して遮光飾り筒を前進させる方向に付勢するばね手段が介在しているズームレンズの鏡筒構造。

5. The zoom lens barrel structure according to claim 1, wherein a direction in which the light-blocking decorative barrel is advanced with respect to the first lens group frame is between the first lens group frame and the light-blocking decorative barrel. 6. The lens barrel structure of the zoom lens in which a spring means for urging the lens is interposed.

JP2004028774A 2003-02-05 2004-02-05 Zoom lens barrel structure Expired - Fee Related JP4050239B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004028774A JP4050239B2 (en) 2003-02-05 2004-02-05 Zoom lens barrel structure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003028631 2003-02-05
JP2004028774A JP4050239B2 (en) 2003-02-05 2004-02-05 Zoom lens barrel structure

Publications (2)

Publication Number Publication Date
JP2004258646A true JP2004258646A (en) 2004-09-16
JP4050239B2 JP4050239B2 (en) 2008-02-20

Family

ID=33133690

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004028774A Expired - Fee Related JP4050239B2 (en) 2003-02-05 2004-02-05 Zoom lens barrel structure

Country Status (1)

Country Link
JP (1) JP4050239B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006349950A (en) * 2005-06-15 2006-12-28 Canon Inc Lens barrel and camera unit therewith
JP2009222875A (en) * 2008-03-14 2009-10-01 Hoya Corp Lens barrel and zoom lens barrel
JP2013064848A (en) * 2011-09-16 2013-04-11 Samsung Techwin Co Ltd Lens barrel and imaging apparatus
JP2014211532A (en) * 2013-04-18 2014-11-13 ソニー株式会社 Lens barrel and imaging device
US8928997B2 (en) 2012-11-26 2015-01-06 Canon Kabushiki Kaisha Lens barrel and image pickup apparatus
US8964306B2 (en) 2012-08-29 2015-02-24 Hoya Corporation Lens barrel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8537477B2 (en) 2010-01-27 2013-09-17 Nikon Corporation Lens barrel and optical device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006349950A (en) * 2005-06-15 2006-12-28 Canon Inc Lens barrel and camera unit therewith
JP4574463B2 (en) * 2005-06-15 2010-11-04 キヤノン株式会社 Lens barrel
JP2009222875A (en) * 2008-03-14 2009-10-01 Hoya Corp Lens barrel and zoom lens barrel
JP2013064848A (en) * 2011-09-16 2013-04-11 Samsung Techwin Co Ltd Lens barrel and imaging apparatus
US8964306B2 (en) 2012-08-29 2015-02-24 Hoya Corporation Lens barrel
US8928997B2 (en) 2012-11-26 2015-01-06 Canon Kabushiki Kaisha Lens barrel and image pickup apparatus
JP2014211532A (en) * 2013-04-18 2014-11-13 ソニー株式会社 Lens barrel and imaging device

Also Published As

Publication number Publication date
JP4050239B2 (en) 2008-02-20

Similar Documents

Publication Publication Date Title
JP3240758B2 (en) Zoom lens device and camera
JP4154349B2 (en) Lens barrel cam mechanism
US6819502B2 (en) Structure of a zoom lens barrel
JP2003021775A (en) Structure of zoom lens barrel
JP4571811B2 (en) Lens barrel cam mechanism
US7373082B2 (en) Light shielding structure of a zoom lens barrel
JP4657850B2 (en) Light blocking structure for zoom lens barrel
JP4050239B2 (en) Zoom lens barrel structure
US6919995B2 (en) Light shielding structure of a retractable lens barrel
US6888685B2 (en) Retracting mechanism of a zoom lens barrel
JP2006071843A (en) Cam mechanism for zoom lens barrel
JP2594825Y2 (en) Light blocking device for lens barrel
JP5525971B2 (en) Lens barrel and imaging device
JP2012053412A (en) Lens barrel and imaging apparatus
JP4130963B2 (en) Shading structure of a retractable lens barrel
JP4159487B2 (en) Compressed storage structure for zoom lens barrel
JP2007034069A (en) Lens barrel
JP4177274B2 (en) Lens barrel structure
JP4159486B2 (en) Compressed storage structure for zoom lens barrel
JP4348205B2 (en) Lens barrel
US5177639A (en) Stop device for zoom lens
US6956705B2 (en) Structure of a lens barrel
JPH09211516A (en) Focal distance variable lens for camera
JP2007206710A (en) Lens barrel
JP4583102B2 (en) Tube

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20041206

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20061011

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20061017

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20061215

RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20070625

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20071120

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20071128

R150 Certificate of patent (=grant) or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101207

Year of fee payment: 3

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111207

Year of fee payment: 4

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111207

Year of fee payment: 4

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121207

Year of fee payment: 5

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121207

Year of fee payment: 5

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131207

Year of fee payment: 6

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees