JP2012042565A - Lens barrel, imaging device and optical adjustment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel having a bending optical system such as a prism for changing optical paths from a first optical axis to a second optical axis, in which influences of a mounting error of an optical member along the second optical axis are reduced to increase the accuracy.SOLUTION: The lens barrel includes an optical member which is movably disposed along a first optical axis (A), an optical member 7 which is disposed and optically adjustable along a second optical axis B, a prism which changes the optical path from the optical axis (A) to the optical axis (B), and optical members 3, 4 disposed along the optical axis (B). Upon optically adjusting the optical member 7, light from a light source 51 passes through an adjustment chart 52, the optical members 3, 4 and 7, and an opening 6a formed in a holding member 6 of the optical member 7, and exits through an opening of the lens barrel to the outside. An adjusting tool lens 53 and a sensor 54 detect the light exiting to the outside of the lens barrel. After adjusting a position of the optical member 7 in a direction perpendicular to the optical axis (B) based on the evaluation results, the optical member 7 is fixed to the holding member 6.

Description

本発明は屈曲光学系を用いたレンズ鏡筒の光学調整に関する。   The present invention relates to optical adjustment of a lens barrel using a bending optical system.

光軸方向をプリズム等の屈曲光学系で変更して結像させる撮像装置が知られている。複数のレンズ群とプリズム等を備えたレンズ鏡筒は、第１のレンズ群が第１の光軸に沿って被写体側からの入射光束を取り込み、第１のレンズ群を透過した光束をプリズムで折り曲げて第２の光軸の方向へと光路を変更する。第２の光軸は、第１の光軸に対して所定の角度、例えば９０度で交差し、第２の光軸に沿って第２のレンズ群を透過した光束を撮像素子が受光する。   2. Description of the Related Art An imaging device that changes an optical axis direction with a bending optical system such as a prism to form an image is known. A lens barrel having a plurality of lens groups and a prism or the like is configured such that the first lens group takes in an incident light beam from the subject side along the first optical axis, and the light beam transmitted through the first lens group is transmitted by the prism. The optical path is changed in the direction of the second optical axis by bending. The second optical axis intersects the first optical axis at a predetermined angle, for example, 90 degrees, and the imaging element receives the light beam that has passed through the second lens group along the second optical axis.

特許文献１に開示のレンズ鏡筒では、最初に第２の光軸に沿って移動する第２のレンズ群が撮像素子側に退避し、その後にできる空間に、第１の光軸に沿って移動する第１のレンズ群が沈胴する。   In the lens barrel disclosed in Patent Document 1, first, the second lens group that moves along the second optical axis is retracted to the image sensor side, and then into the space formed along the first optical axis. The moving first lens group is retracted.

また一般に、レンズ鏡筒の組み立て誤差や寸法誤差を吸収するために、レンズ群またはレンズ群を構成する単レンズを光学調整可能に構成したレンズ鏡筒が知られている。
特許文献２に開示のレンズ鏡筒では、まず第２の光軸に沿ったレンズ群をレンズ鏡筒に取り付け、レンズ鏡筒を撮像装置本体に設置した後で第１の光軸に沿うレンズ群を調整可能な構成をもつ。 In general, there is known a lens barrel in which a lens group or a single lens constituting the lens group is optically adjustable in order to absorb an assembly error or a dimensional error of the lens barrel.
In the lens barrel disclosed in Patent Document 2, first, a lens group along the second optical axis is attached to the lens barrel, and after the lens barrel is installed in the imaging apparatus main body, the lens group along the first optical axis. Can be adjusted.

特許文献３に開示のプリズム検査方法では、プリズムを保持するプリズム保持部材にて、プリズムの反射面と対向する位置に中間壁を備え、中間壁に開口部を設けることでプリズムの反射面の位置を計測可能にする。   In the prism inspection method disclosed in Patent Document 3, the prism holding member that holds the prism is provided with an intermediate wall at a position facing the reflecting surface of the prism, and the position of the reflecting surface of the prism is provided by providing an opening in the intermediate wall. Can be measured.

特開２００６−２５９６８５号公報JP 2006-259665A 特開２００９−１４５６９１号公報JP 2009-145691 A 特開２００９−１０４１６８号公報JP 2009-104168 A

しかしながら従来の技術では前記第２のレンズ群に係る光学調整に関して以下の問題があった。
前記特許文献２に開示の技術では、プリズムを含む屈曲光学系で光学調整を実施する。このため、第２の光軸に沿ったレンズ群の取付誤差には、プリズムの取付誤差による光軸の倒れ成分が含まれてしまうという問題があった。
また特許文献３にはプリズムの取付誤差の検査についてのみ開示されており、第２の光軸に沿ったレンズ群の取付誤差を吸収する光学調整が出来ないという問題があった。 However, the conventional technique has the following problems concerning the optical adjustment related to the second lens group.
In the technique disclosed in Patent Document 2, optical adjustment is performed using a bending optical system including a prism. For this reason, there has been a problem that the mounting error of the lens group along the second optical axis includes a tilting component of the optical axis due to the mounting error of the prism.
Further, Patent Document 3 discloses only an inspection of a prism mounting error, and there is a problem that optical adjustment that absorbs the mounting error of the lens group along the second optical axis cannot be performed.

そこで本発明の目的は、第１の光軸から第２の光軸へと光路を変更するためにプリズム等の屈曲光学系を有するレンズ鏡筒において、第２の光軸に沿う光学部材に係る取付誤差の影響を低減して精度を高めることにある。   Therefore, an object of the present invention relates to an optical member along the second optical axis in a lens barrel having a bending optical system such as a prism for changing the optical path from the first optical axis to the second optical axis. The purpose is to increase the accuracy by reducing the influence of mounting errors.

上記課題を解決するために本発明に係るレンズ鏡筒は、第１の光軸上に配置される第１の光学部材と、第２の光軸上に配置される光学調整可能な第２の光学部材と、前記第１の光軸から前記第２の光軸へと光路を変更する屈曲光学素子と、前記第２の光軸上に配置される第３の光学部材を備えたレンズ鏡筒であって、前記第２の光軸上に前記第２の光学部材を配置して該光学部材の光学調整を行う際に、光学調整に用いる光源からの光が、前記第２の光軸に沿って前記第３の光学部材及び第２の光学部材を通り、前記レンズ鏡筒を貫通してその開口部から外部に出射されるように構成したものである。   In order to solve the above problems, a lens barrel according to the present invention includes a first optical member disposed on the first optical axis and a second optically adjustable second lens disposed on the second optical axis. A lens barrel including an optical member, a bending optical element that changes an optical path from the first optical axis to the second optical axis, and a third optical member that is disposed on the second optical axis When the second optical member is disposed on the second optical axis and optical adjustment of the optical member is performed, light from a light source used for optical adjustment is applied to the second optical axis. Along the third optical member and the second optical member, and passes through the lens barrel so as to be emitted to the outside from the opening.

本発明によれば、前記第２の光軸上に配置された光学部材のみで光学調整を行えるので、光学部材の取付誤差の影響を低減して精度を高めることができる。   According to the present invention, since the optical adjustment can be performed only with the optical member disposed on the second optical axis, it is possible to reduce the influence of the mounting error of the optical member and increase the accuracy.

図２及び３と併せて本発明の実施形態に係るレンズ鏡筒の構成例として、広角位置にある状態を示す要部断面図である。FIG. 4 is a cross-sectional view of the main part showing a state at a wide angle position as a configuration example of the lens barrel according to the embodiment of the present invention in combination with FIGS. レンズ鏡筒が望遠位置にある状態を示す要部断面図である。It is principal part sectional drawing which shows the state which has a lens-barrel in a telephoto position. レンズ鏡筒が収納位置にある状態を示す要部断面図である。It is principal part sectional drawing which shows the state which has a lens-barrel in a storage position. 図１乃至３に示す固定筒６２の内周面の展開図である。FIG. 4 is a development view of an inner peripheral surface of a fixed cylinder 62 shown in FIGS. 1 to 3. プリズムの保持部材とその支持機構の構成例を示す斜視図である。It is a perspective view which shows the structural example of the holding member of a prism, and its support mechanism. 調整レンズの光学調整に関与する部分の構成例を示す斜視図である。It is a perspective view which shows the structural example of the part which concerns on the optical adjustment of an adjustment lens. 調整レンズの光学調整を説明する模式図である。It is a schematic diagram explaining the optical adjustment of an adjustment lens. 第１群レンズ及び第２群レンズを含む可動部と、鏡筒ベースを示す分解斜視図である。It is a disassembled perspective view which shows the movable part containing a 1st group lens and a 2nd group lens, and a lens-barrel base.

以下、本発明の実施形態に係る撮像装置の一例を、図面を参照して説明する。なお、本実施形態では、デジタルカメラ等の撮像装置に搭載されるレンズ鏡筒を例にして説明する。
図１は、本実施形態に係る撮像装置のレンズ鏡筒がＷＩＤＥ位置（広角位置）にある状態を示す要部断面図である。図１に示すレンズ鏡筒は、Ａ軸で示す第１の光軸上に配置された第１レンズ群１０及び第２レンズ群２０（第１の光学部材）を備える。またレンズ鏡筒は、Ｂ軸で示す第２の光軸上に配置された調整レンズ７（第２の光学部材）、第３レンズ群３０及び第４レンズ群４０（第３の光学部材）を備える。第１レンズ群１０及び第２レンズ群２０の駆動機構は、固定筒６２に保持されるカム筒６１及び直進ガイド筒６３を備える。 Hereinafter, an example of an imaging apparatus according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, a lens barrel mounted on an imaging apparatus such as a digital camera will be described as an example.
FIG. 1 is a main part cross-sectional view showing a state in which the lens barrel of the imaging apparatus according to the present embodiment is at the WIDE position (wide-angle position). The lens barrel shown in FIG. 1 includes a first lens group 10 and a second lens group 20 (first optical member) disposed on a first optical axis indicated by the A axis. The lens barrel includes an adjustment lens 7 (second optical member), a third lens group 30 and a fourth lens group 40 (third optical member) disposed on the second optical axis indicated by the B axis. Prepare. The driving mechanism of the first lens group 10 and the second lens group 20 includes a cam cylinder 61 and a rectilinear guide cylinder 63 held by a fixed cylinder 62.

第１レンズ群１０は１群レンズ１及び２群レンズ２を有し、１群レンズ１は１群鏡筒１１が保持し、２群レンズ２は２群鏡筒２１が保持する。１群レンズ１及び２群レンズ２を通って入射した光束は、プリズム５により第１の光軸Ａから第２の光軸Ｂへと光路変更を受ける。つまり、１群レンズ１及び２群レンズ２を通った光は、光軸Ａに対して略９０°の角度で交差する光軸Ｂの方向に屈曲され、第３レンズ群３０及び第４レンズ群４０、光学フィルタ８を通って撮像素子９に導かれる。
屈曲光学素子の一例としてのプリズム５は保持部材６に保持されており、不図示の駆動機構により第２の光軸Ｂに沿って移動可能である。保持部材６は、プリズム５の出射面側の光軸Ｂ上において調整レンズ７を光学調整可能に保持する。保持部材６には、第２の光軸Ｂに沿って貫通状態で開口部６ａが形成されており、調整レンズ７とは反対側に形成された開口部６ａは、遮光部材であるプリズムカバー１５によって遮光される。プリズム５で光路変更を受けた光は調整レンズ７を通った後、第２の光軸Ｂ上の第３レンズ群３０、第４レンズ群４０及び光学フィルタ８を通って撮像素子９に到達する。
第３レンズ群３０は、前地板３２に取り付けられたシャッタ（図６及び図８のシャッタ駆動部３０ａ参照）と、後地板３４に保持された３群レンズ３を備え、後地板３４と前地板３２はねじ締結等で結合されている。第３レンズ群３０は、不図示の第３レンズ群用モータによって第２の光軸Ｂに沿って移動することで変倍動作が行われる。また第４レンズ群４０にて４群レンズホルダ４１は４群レンズ４に保持する。４群レンズ４が不図示の第４レンズ群用モータによって第２の光軸Ｂに沿って移動することで、変倍動作及び合焦動作が行われる。光学フィルタ８は、空間周波数の高い光を遮断する為のローパスフィルタ機能及び赤外光を遮断する機能を有する。 The first lens group 10 includes a first group lens 1 and a second group lens 2. The first group lens 1 is held by the first group lens barrel 11, and the second group lens 2 is held by the second group lens barrel 21. The light beam incident through the first group lens 1 and the second group lens 2 undergoes an optical path change from the first optical axis A to the second optical axis B by the prism 5. That is, the light passing through the first group lens 1 and the second group lens 2 is bent in the direction of the optical axis B that intersects the optical axis A at an angle of about 90 °, and the third lens group 30 and the fourth lens group. 40, guided to the image sensor 9 through the optical filter 8.
The prism 5 as an example of a bending optical element is held by a holding member 6 and can be moved along the second optical axis B by a driving mechanism (not shown). The holding member 6 holds the adjustment lens 7 on the optical axis B on the emission surface side of the prism 5 so as to be optically adjustable. The holding member 6 is formed with an opening 6a penetrating along the second optical axis B. The opening 6a formed on the side opposite to the adjustment lens 7 is a prism cover 15 which is a light shielding member. Is shielded from light. The light whose optical path has been changed by the prism 5 passes through the adjustment lens 7, and then reaches the image sensor 9 through the third lens group 30, the fourth lens group 40 and the optical filter 8 on the second optical axis B. .
The third lens group 30 includes a shutter (see the shutter driving unit 30a in FIGS. 6 and 8) attached to the front base plate 32, and a third group lens 3 held by the rear base plate 34. The rear base plate 34 and the front base plate 32 is connected by screw fastening or the like. The third lens group 30 performs a zooming operation by moving along the second optical axis B by a third lens group motor (not shown). In the fourth lens group 40, the fourth group lens holder 41 is held by the fourth group lens 4. When the fourth group lens 4 is moved along the second optical axis B by a fourth lens group motor (not shown), a zooming operation and a focusing operation are performed. The optical filter 8 has a low-pass filter function for blocking light with a high spatial frequency and a function for blocking infrared light.

図２は、レンズ鏡筒がＴＥＬＥ位置（望遠位置）にある状態を示す要部断面図である。この状態では、図１に示す状態と比較した場合、第１レンズ群１０が第１の光軸Ａに沿って被写体側に前進するとともに、第２レンズ群２０が第１の光軸Ａに沿って後退してプリズム５に接近した位置で停止している。また第３レンズ群３０は、第２の光軸Ｂに沿ってプリズム５に向かって移動し、プリズム５に接近した位置で停止している。第４レンズ群４０は、第２の光軸Ｂに沿って撮像素子９に向かって移動して該素子に接近した位置で停止している。   FIG. 2 is a cross-sectional view of the main part showing a state where the lens barrel is in the TELE position (telephoto position). In this state, when compared with the state shown in FIG. 1, the first lens group 10 advances toward the subject along the first optical axis A, and the second lens group 20 extends along the first optical axis A. And then stops at a position approaching the prism 5. The third lens group 30 moves toward the prism 5 along the second optical axis B, and stops at a position close to the prism 5. The fourth lens group 40 moves toward the image sensor 9 along the second optical axis B and stops at a position close to the element.

図３は、レンズ鏡筒がＳＩＮＫ位置（収納位置）にある状態を示す要部断面図である。この状態では、プリズム５、第３レンズ群３０及び第４レンズ群４０が、第２の光軸Ｂに沿って撮像素子９側にて互いに干渉しない位置に移動している。これによりレンズ鏡筒内には、第１レンズ群１０及び第２レンズ群２０の収納空間が形成されるので、これらのレンズ群を光軸Ａに沿って後退させ、収納空間に位置させて固定筒６２内に収納できる。   FIG. 3 is a cross-sectional view of the main part showing a state where the lens barrel is in the SINK position (storage position). In this state, the prism 5, the third lens group 30, and the fourth lens group 40 have moved along the second optical axis B to positions that do not interfere with each other on the image sensor 9 side. As a result, a storage space for the first lens group 10 and the second lens group 20 is formed in the lens barrel, and these lens groups are retracted along the optical axis A and positioned in the storage space and fixed. It can be stored in the cylinder 62.

図４は固定筒６２の内周面を展開して示す図である。固定筒６２の内周面には、複数のカム溝６２ａが形成されている。これらのカム溝６２ａには、カム筒６１の外周部に設けたカムピン（不図示）がカム係合する。カム溝６２ａは直線溝と傾斜溝をもち、符号６２ｃ乃至ｅはカムピンの係合位置を表しており、その詳細については後述する。また矩形状の切り欠き部６２ｂは、プリズム５が光軸Ｂに沿って撮像素子９の側に移動する際に固定筒６２と干渉しないように形成されている。   FIG. 4 is a developed view of the inner peripheral surface of the fixed cylinder 62. A plurality of cam grooves 62 a are formed on the inner peripheral surface of the fixed cylinder 62. Cam pins (not shown) provided on the outer periphery of the cam cylinder 61 are cam-engaged with these cam grooves 62a. The cam groove 62a has a straight groove and an inclined groove, and reference numerals 62c to 62e denote cam pin engagement positions, the details of which will be described later. The rectangular cutout portion 62b is formed so as not to interfere with the fixed cylinder 62 when the prism 5 moves along the optical axis B toward the image sensor 9 side.

カム筒６１の外周部にはギア部（不図示）が形成され、不図示のモータから駆動力が伝達されることで、カム筒６１が第１の光軸Ａを中心軸として回転駆動される。このとき、固定筒６２のカム溝６２ａとカム筒６１のカムピンとのカム係合により、カム筒６１は第１の光軸Ａに沿って進退する。また、カム筒６１の内周部には、不図示の１群カム溝及び２群カム溝が形成されている。
直進ガイド筒６３は、カム筒６１の内周側に配置され、カム筒６１と一体に回転可能であって、且つ、第１の光軸Ａの方向に移動可能である。図１乃至３に示すように、カム筒６１と直進ガイド筒６３との間には１群鏡筒１１の一部が配置され、その外周部に設けたカムピンがカム筒６１の１群カム溝（不図示）とカム係合している。また、直進ガイド筒６３の外周部には、第１の光軸Ａの方向に沿って延びる直進溝（不図示）が形成されており、この直進溝に１群鏡筒１１の内周部に設けた凸部が係合することにより、１群鏡筒１１の回転方向の動きが規制される。 A gear portion (not shown) is formed on the outer peripheral portion of the cam barrel 61, and the cam barrel 61 is rotationally driven around the first optical axis A as a driving force is transmitted from a motor (not shown). . At this time, the cam cylinder 61 advances and retreats along the first optical axis A by the cam engagement between the cam groove 62 a of the fixed cylinder 62 and the cam pin of the cam cylinder 61. A first group cam groove and a second group cam groove (not shown) are formed on the inner peripheral portion of the cam cylinder 61.
The rectilinear guide tube 63 is disposed on the inner peripheral side of the cam tube 61, can rotate integrally with the cam tube 61, and can move in the direction of the first optical axis A. As shown in FIGS. 1 to 3, a part of the first group barrel 11 is disposed between the cam barrel 61 and the rectilinear guide barrel 63, and a cam pin provided on the outer peripheral portion thereof is a first group cam groove of the cam barrel 61. (Not shown) is cam-engaged. Further, a rectilinear groove (not shown) extending along the direction of the first optical axis A is formed in the outer peripheral portion of the rectilinear guide tube 63, and the rectilinear groove is formed in the inner peripheral portion of the first group barrel 11. Engagement of the provided projections restricts the movement of the first group barrel 11 in the rotational direction.

直進ガイド筒６３の内周側には２群鏡筒２１の一部が配置され、第２レンズ群２０は、第１レンズ群１０と同様にカム機構によって移動する。つまり、２群鏡筒２１に設けた不図示のカムピンがカム筒６１の２群カム溝にカム係合する。また、直進ガイド筒６３には第１の光軸Ａの方向に沿って不図示の貫通溝が設けられており、この貫通溝には２群鏡筒２１のカムピンの根元に配置された係合部が係合する。これにより、２群鏡筒２１の回転方向の動きが規制される。
不図示のモータ及び伝達機構によってカム筒６１が回転すると、カム筒６１の１群カム溝と１群鏡筒１１のカムピンとがカム係合した状態で、１群鏡筒１１に設けた凸部が直進ガイド筒６３の直進溝を第１の光軸Ａの方向に沿って摺動する。１群鏡筒１１がカム筒６１に対して光軸に沿って進退する。カム筒６１が固定筒６２に対して第１の光軸Ａの方向に沿って進退すると、カム筒６１に対して１群鏡筒１１が第１の光軸Ａに沿って進退し、１群レンズ１は収納位置と撮影位置との間を移動する。２群レンズ２についても、同様のカム作用及び動作によって収納位置と撮影位置との間を移動する。 A part of the second group lens barrel 21 is disposed on the inner peripheral side of the rectilinear guide tube 63, and the second lens group 20 is moved by the cam mechanism in the same manner as the first lens group 10. That is, a cam pin (not shown) provided in the second group barrel 21 is cam-engaged with the second group cam groove of the cam barrel 61. The straight guide tube 63 is provided with a through groove (not shown) along the direction of the first optical axis A, and this through groove is an engagement disposed at the root of the cam pin of the second group barrel 21. The parts engage. As a result, the movement of the second group barrel 21 in the rotational direction is restricted.
When the cam barrel 61 is rotated by a motor and a transmission mechanism (not shown), the convex portion provided in the first group barrel 11 with the first group cam groove of the cam barrel 61 and the cam pin of the first group barrel 11 cam-engaged. Slides along the direction of the first optical axis A in the rectilinear groove of the rectilinear guide tube 63. The first group barrel 11 advances and retreats along the optical axis with respect to the cam barrel 61. When the cam cylinder 61 advances and retreats along the direction of the first optical axis A with respect to the fixed cylinder 62, the first group lens barrel 11 advances and retracts along the first optical axis A with respect to the cam cylinder 61. The lens 1 moves between the storage position and the photographing position. The second group lens 2 also moves between the storage position and the photographing position by the same cam action and operation.

次に図５乃至７を参照して、調整レンズ７の光学調整について説明する。図５は保持部材６と調整レンズ７を示す要部の斜視図である。保持部材６には撮像素子９と対向する側に、調整レンズ７の粗調整を行うための保持部としてのリング状凸部６ｂと、接着剤溜まり６ｃが設けられている。本例では、調整レンズ７の大まかな位置を決めるためにリング状凸部６ｂが使用され、調整レンズ７の最終調整が完了した時点で該レンズの接着固定が行われる。リング状凸部６ｂの内径部は調整レンズ７の外径に対し隙間を有しており、この隙間が調整レンズ７の偏芯調整範囲となる。作業者は工具等を使って調整レンズ７の位置を調整した後、接着剤溜まり６ｃに接着剤を注入して調整レンズ７を固定する。調整レンズ７は、第２の光軸Ｂ上の第３レンズ群３０、第４レンズ群４０の寸法誤差、組み立て誤差を吸収し、第２の光軸Ｂ上に位置する光学部材の光学性能を保証するための調整機能をもつ。   Next, the optical adjustment of the adjustment lens 7 will be described with reference to FIGS. FIG. 5 is a perspective view of the main part showing the holding member 6 and the adjustment lens 7. The holding member 6 is provided with a ring-shaped convex portion 6 b as a holding portion for performing rough adjustment of the adjustment lens 7 and an adhesive reservoir 6 c on the side facing the image sensor 9. In this example, the ring-shaped convex portion 6b is used to determine the rough position of the adjustment lens 7, and when the final adjustment of the adjustment lens 7 is completed, the lens is bonded and fixed. The inner diameter portion of the ring-shaped convex portion 6 b has a gap with respect to the outer diameter of the adjustment lens 7, and this gap becomes an eccentricity adjustment range of the adjustment lens 7. The operator adjusts the position of the adjustment lens 7 using a tool or the like, and then fixes the adjustment lens 7 by injecting an adhesive into the adhesive reservoir 6c. The adjusting lens 7 absorbs dimensional errors and assembly errors of the third lens group 30 and the fourth lens group 40 on the second optical axis B, and improves the optical performance of the optical member positioned on the second optical axis B. It has an adjustment function to guarantee.

図６は、調整レンズ７を調整するときに関係するレンズ鏡筒の要部を示す斜視図である。１対のガイドバー１６は、保持部材６、第３レンズ群３０、第４レンズ群４０を支持するとともに、これらを第２の光軸Ｂの方向に沿って移動可能な状態で案内する。鏡筒ベース１７はガイドバー１６、光学フィルタ８、撮像素子９、固定筒６２等を保持する。図示のとおり、調整レンズ７の調整時には、固定筒６２及び固定筒６２に保持される第１レンズ群１０、第２レンズ群２０と、光学フィルタ８、撮像素子９は取り付けられていない。また保持部材６にプリズム５は取り付けられていない。
保持部材６には、撮像素子９と反対側の光軸Ｂ上に開口部６ａが設けられている。また鏡筒ベース１７には、撮像素子９と反対側の光軸Ｂ上に開口部１７ａが設けられている。これらの開口部６ａ及び１７ａは、後述するように調整レンズ７を通った光線が不図示の検出部に到達するように各部に形成され、従って、第２の光軸Ｂ上には光線を遮る部材は無く、後述する外部光源からの光線を、レンズ鏡筒を貫いて通すことができる。なお、前地板３２にて保持部材６の側に固定されたシャッタ駆動部３０ａは、第２の光軸Ｂに沿って移動可能である。 FIG. 6 is a perspective view showing a main part of the lens barrel related to adjusting the adjustment lens 7. The pair of guide bars 16 supports the holding member 6, the third lens group 30, and the fourth lens group 40, and guides them while being movable along the direction of the second optical axis B. The lens barrel base 17 holds the guide bar 16, the optical filter 8, the image sensor 9, the fixed cylinder 62, and the like. As illustrated, when adjusting the adjustment lens 7, the first lens group 10, the second lens group 20, the optical filter 8, and the image sensor 9 that are held by the fixed cylinder 62 and the fixed cylinder 62 are not attached. The prism 5 is not attached to the holding member 6.
The holding member 6 is provided with an opening 6 a on the optical axis B on the side opposite to the imaging element 9. The lens barrel base 17 is provided with an opening 17 a on the optical axis B opposite to the image sensor 9. These openings 6a and 17a are formed in each part so that the light beam that has passed through the adjusting lens 7 reaches a detection unit (not shown) as will be described later, and accordingly the light beam is blocked on the second optical axis B. There is no member, and light from an external light source described later can be passed through the lens barrel. Note that the shutter drive unit 30 a fixed to the holding member 6 side by the front base plate 32 is movable along the second optical axis B.

図７は調整レンズ７の光学調整方法を実施する際の模式図である。レンズ鏡筒に対して、第２の光軸Ｂ上に光源５１と調整用チャート５２が設置されている。調整用チャート５２は、後の工程で取り付けられる撮像素子９と同一の位置に設置される。光源５１や調整用チャート５２とは反対側の光軸Ｂ上には、調整用工具レンズ５３、調整用工具センサ５４が設置される。光源５１から発した光は、調整用チャート５２、４群レンズ４、３群レンズ３、調整レンズ７を透過して、保持部材６に設けた開口部６ａを通る。そして光は開口部１７ａから出て調整用工具レンズ５３を透過し、調整用工具センサ５４の受光部には、調整用チャート５２に描かれたチャートの検出像が得られる。調整用工具レンズ５３及び調整用工具センサ５４は検出光学系（検出手段）を構成する。作業者が調整レンズ７の位置を矢印方向、つまり第２の光軸Ｂに対して直交する方向に変位させることで、結像したチャート像のボケ量や歪みが変化する。結像したチャートを調整用工具センサ５４が読み取り、結像したチャート像のボケ量や歪みを不図示の処理装置で評価することで、作業者は評価結果に基づいて調整レンズ７による光学調整状態の良否を判断できる。保持部材６に設けた開口部６ａ及び鏡筒ベース１７に設けた開口部１７ａは、結像したチャート像の評価に必要な量の光束を透過させるための充分な大きさを有する。
作業者は調整レンズ７の調整を終えて該レンズを接着固定した後、プリズム５を保持部材６に取り付け、プリズムカバー１５によって保持部材６に設けた開口部６ａを塞いで遮光する。その後、作業者はカム筒６１、第１レンズ群１０、第２レンズ群２０等を保持した固定筒６２を鏡筒ベース１７に取り付け、固定筒６２によって鏡筒ベースの開口部１７ａを塞ぐ。こうしてレンズ鏡筒が完成する。 FIG. 7 is a schematic diagram when the optical adjustment method of the adjustment lens 7 is performed. A light source 51 and an adjustment chart 52 are installed on the second optical axis B with respect to the lens barrel. The adjustment chart 52 is installed at the same position as the image sensor 9 to be attached in a later process. On the optical axis B opposite to the light source 51 and the adjustment chart 52, an adjustment tool lens 53 and an adjustment tool sensor 54 are installed. Light emitted from the light source 51 passes through the adjustment chart 52, the fourth group lens 4, the third group lens 3, and the adjustment lens 7 and passes through the opening 6 a provided in the holding member 6. Then, the light exits from the opening 17 a and passes through the adjustment tool lens 53, and a detection image of the chart drawn on the adjustment chart 52 is obtained at the light receiving portion of the adjustment tool sensor 54. The adjustment tool lens 53 and the adjustment tool sensor 54 constitute a detection optical system (detection means). When the operator displaces the position of the adjustment lens 7 in the direction of the arrow, that is, in the direction orthogonal to the second optical axis B, the blur amount and distortion of the formed chart image change. The adjustment tool sensor 54 reads the formed chart and evaluates the blur amount and distortion of the formed chart image with a processing device (not shown), so that the operator can adjust the optical adjustment state by the adjustment lens 7 based on the evaluation result. Can be judged. The opening 6a provided in the holding member 6 and the opening 17a provided in the lens barrel base 17 have a sufficient size to transmit an amount of light flux necessary for evaluation of the formed chart image.
After the adjustment of the adjustment lens 7 is completed and the lens is bonded and fixed, the operator attaches the prism 5 to the holding member 6, and the prism cover 15 blocks the opening 6 a provided in the holding member 6 to block light. Thereafter, the operator attaches the fixed barrel 62 holding the cam barrel 61, the first lens group 10, the second lens group 20 and the like to the barrel base 17, and closes the opening portion 17a of the barrel base with the fixed barrel 62. Thus, the lens barrel is completed.

以上のように本実施形態では、プリズム５よりも撮像素子９の側にて第２の光軸Ｂに沿ったレンズ群のみで光学調整を行える。また、調整レンズ７の調整により、プリズム５の取付誤差の成分を除いた光学調整ができるため、より正確な光学調整が可能となる。   As described above, in the present embodiment, optical adjustment can be performed using only the lens group along the second optical axis B on the image sensor 9 side of the prism 5. Further, since the adjustment of the adjustment lens 7 can perform the optical adjustment excluding the component of the mounting error of the prism 5, more accurate optical adjustment is possible.

次に可動部材同士の干渉によって、該干渉に耐えられる程には強度の強くない部品が破損しないように防止するための対策について説明する。
前記レンズ鏡筒にて、第１の光軸Ａに沿って移動するレンズ群と第２の光軸Ｂに沿って移動するレンズ群が個別に移動する場合、光軸Ｂに沿って収納位置へ移動するレンズ群が退避する前に光軸Ａに沿って移動するレンズ群が沈胴したとする。この場合、部品同士が接触する虞が生じる。例えば、図３に示すように、プリズム５、第３レンズ群３０及び第４レンズ群４０が、光軸Ｂに沿って撮像素子９側に移動して収納位置に来る前に、第１レンズ群１０及び第２レンズ群２０が光軸Ａに沿って後退したとする。この場合、部材同士の干渉によって強度の強くない部品が破損する虞がある。以下では、このような干渉によって生じる問題への対策を説明する。 Next, a countermeasure for preventing a component that is not strong enough to withstand the interference from interference between the movable members will be described.
When the lens group that moves along the first optical axis A and the lens group that moves along the second optical axis B move individually in the lens barrel, the lens barrel moves to the storage position along the optical axis B. It is assumed that the lens group moving along the optical axis A is retracted before the moving lens group is retracted. In this case, there exists a possibility that components may contact. For example, as shown in FIG. 3, the first lens group before the prism 5, the third lens group 30, and the fourth lens group 40 move to the image sensor 9 side along the optical axis B and reach the storage position. It is assumed that the lens 10 and the second lens group 20 are retracted along the optical axis A. In this case, there is a possibility that a component having a low strength is damaged due to interference between members. In the following, countermeasures for problems caused by such interference will be described.

図８は直進ガイド筒６３とシャッタ駆動部３０ａ、移動量規制部６ｄの位置関係を示すレンズ鏡筒の分解斜視図である。図中に示すＹは、第１の光軸Ａの方向における直進ガイド筒６３とシャッタ駆動部３０ａとの距離を示し、Ｚは第１の光軸Ａの方向における直進ガイド筒６３と移動量規制部６ｄとの距離を示す。第１の光軸Ａの方向において保持部材６に設けた移動量規制部６ｄはシャッタ駆動部３０ａよりも被写体の側に位置しているため、距離Ｚは距離Ｙよりも小さい（Ｚ＜Ｙ）。   FIG. 8 is an exploded perspective view of the lens barrel showing the positional relationship between the rectilinear guide tube 63, the shutter drive unit 30a, and the movement amount restricting unit 6d. In the figure, Y indicates the distance between the rectilinear guide tube 63 and the shutter drive unit 30a in the direction of the first optical axis A, and Z indicates the rectilinear guide tube 63 and the movement amount regulation in the direction of the first optical axis A. The distance with the part 6d is shown. Since the movement amount restricting portion 6d provided on the holding member 6 in the direction of the first optical axis A is located closer to the subject than the shutter driving portion 30a, the distance Z is smaller than the distance Y (Z <Y). .

以下では、レンズ鏡筒が図２に示すＴＥＬＥ位置での撮影状態から、図３に示すＳＩＮＫ位置（収納位置）に移動する際、第１レンズ群１０等に外力が加わった場合について説明する。
図４に示すように固定筒６２のカム溝６２ａにはカム筒６１のカムピン（不図示）がカム係合している。位置６２ｃ乃至ｅは、このカムピンがカム溝６２ａに係合する位置を表している。位置６２ｃ及び６２ｅではカムピンがカム溝６２ａの直線溝に係合し、位置６２ｄではカムピンがカム溝６２ａの傾斜溝に係合している。このカムピンが、位置６２ｄのようにカム溝６２ａの傾斜溝内、つまり傾きの大きい位置に来ている状態で、第１レンズ群１０等に外力が加わった場合を想定する。外力によって、カム筒６１はカム溝６２ａの傾斜部に沿って回転しながら収納位置の方向へ移動する。このとき、図８のように第３レンズ群３０が収納位置まで退避していない状態では、シャッタ駆動部３０ａと直進ガイド筒６３が干渉し、シャッタ駆動部３０ａが破損する虞がある。
本実施形態では、移動量規制部６ｄが保持部材６に設けられており、「Ｚ＜Ｙ」の関係が成り立つ。よって、図８のように直進ガイド筒６３がシャッタ駆動部３０ａと干渉する位置に来る前に、移動量規制部６ｄの規制面が直進ガイド筒６３の一部に当接し、それ以上の移動（後退）を規制する。これにより、シャッタ駆動部３０ａの機械的強度を高くしなくても保護できる。 Hereinafter, a case where an external force is applied to the first lens group 10 and the like when the lens barrel moves from the photographing state at the TELE position shown in FIG. 2 to the SINK position (storage position) shown in FIG. 3 will be described.
As shown in FIG. 4, a cam pin (not shown) of the cam cylinder 61 is cam-engaged with the cam groove 62 a of the fixed cylinder 62. Positions 62c to 62e represent positions where the cam pins are engaged with the cam grooves 62a. At positions 62c and 62e, the cam pin is engaged with the linear groove of the cam groove 62a, and at position 62d, the cam pin is engaged with the inclined groove of the cam groove 62a. A case is assumed in which an external force is applied to the first lens group 10 and the like in a state where the cam pin is in the inclined groove of the cam groove 62a, that is, a position having a large inclination as in the position 62d. Due to the external force, the cam cylinder 61 moves in the direction of the storage position while rotating along the inclined portion of the cam groove 62a. At this time, when the third lens group 30 is not retracted to the retracted position as shown in FIG. 8, the shutter drive unit 30a and the straight guide tube 63 may interfere with each other and the shutter drive unit 30a may be damaged.
In the present embodiment, the movement amount regulating portion 6d is provided in the holding member 6, and the relationship of “Z <Y” is established. Therefore, before the rectilinear guide tube 63 comes to a position where it interferes with the shutter drive unit 30a as shown in FIG. 8, the restricting surface of the moving amount restricting portion 6d comes into contact with a part of the rectilinear guide tube 63 and moves further ( Regulate retreat). Thereby, it is possible to protect the shutter drive unit 30a without increasing the mechanical strength.

以上説明したように、本実施形態では、保持部材６が撮影位置にある状態で、第１の光軸Ａに沿って進退する可動部（直進ガイド筒６３を含む）が収納位置へ移動する際、その移動を規制する移動量規制部６ｄを保持部材６に設けている。これにより第２の光軸Ｂに沿って移動するレンズ群が収納位置へ退避する前に、第１の光軸Ａに沿って移動する可動部（前群鏡筒部）が沈胴しても第２の光軸Ｂに沿って移動する部材と干渉して破損しないように防止できる。   As described above, in this embodiment, when the movable member (including the rectilinear guide tube 63) that moves forward and backward along the first optical axis A moves to the storage position with the holding member 6 in the photographing position. The holding member 6 is provided with a movement amount regulating portion 6d for regulating the movement. As a result, before the lens group moving along the second optical axis B is retracted to the storage position, even if the movable portion (front group barrel) moving along the first optical axis A is retracted, It is possible to prevent the member moving along the optical axis B of 2 from interfering with and being damaged.

なお、本発明は上記実施形態に例示した構成に限定されるものではなく、材質、形状、寸法、形態、数、配置箇所等は、本発明の要旨を逸脱しない範囲において適宜変更可能である。例えば、上記の例では屈曲光学素子としてプリズム５を示したが、これに限らず、ミラー等を用いてもよい。上記の例では調整レンズ７を保持部材６に設けたが、光学調整用のレンズが、例えば３群レンズ３や４群レンズ４であってもよい。また上記の説明では、直進ガイド筒６３とシャッタ駆動部３０ａが干渉しないための構成例を示した。しかし本発明はこれに限定されず、例えば第２レンズ群２０と後地板３４の干渉を防止する手段（規制部）を講じてもよい。   In addition, this invention is not limited to the structure illustrated to the said embodiment, A material, a shape, a dimension, a form, a number, an arrangement | positioning location, etc. can be suitably changed in the range which does not deviate from the summary of this invention. For example, although the prism 5 is shown as the bending optical element in the above example, the present invention is not limited to this, and a mirror or the like may be used. In the above example, the adjustment lens 7 is provided on the holding member 6, but the lens for optical adjustment may be, for example, the third group lens 3 or the fourth group lens 4. In the above description, a configuration example for preventing the straight guide tube 63 and the shutter drive unit 30a from interfering with each other is shown. However, the present invention is not limited to this. For example, a means (regulator) for preventing interference between the second lens group 20 and the backplate 34 may be provided.

１，２ レンズ（第１の光学部材）
３，４ レンズ（第３の光学部材）
５ プリズム（屈曲光学素子）
６ 保持部材
６ａ 開口部
６ｄ 移動量規制部
７ 調整レンズ（第２の光学部材）
１５ プリズムカバー
１７ 鏡筒ベース
１７ａ 開口部
３０ａ シャッタ駆動部
６３ 直進ガイド筒 1, 2 lenses (first optical member)
3,4 lenses (third optical member)
5 Prism (bending optical element)
6 Holding member 6a Opening 6d Movement amount restricting portion 7 Adjustment lens (second optical member)
Reference Signs List 15 prism cover 17 lens barrel base 17a opening 30a shutter drive unit 63 rectilinear guide tube

Claims (8)

第１の光軸上に配置される第１の光学部材と、
第２の光軸上に配置される光学調整可能な第２の光学部材と、
前記第１の光軸から前記第２の光軸へと光路を変更する屈曲光学素子と、
前記第２の光軸上に配置される第３の光学部材を備えたレンズ鏡筒であって、
前記第２の光軸上に前記第２の光学部材を配置して該光学部材の光学調整を行う際に、光学調整に用いる光源からの光が、前記第２の光軸に沿って前記第３の光学部材及び第２の光学部材を通り、前記レンズ鏡筒を貫通してその開口部から外部に出射されるように構成したことを特徴とするレンズ鏡筒。 A first optical member disposed on the first optical axis;
An optically adjustable second optical member disposed on the second optical axis;
A bending optical element that changes an optical path from the first optical axis to the second optical axis;
A lens barrel including a third optical member disposed on the second optical axis,
When the second optical member is disposed on the second optical axis and optical adjustment of the optical member is performed, light from a light source used for optical adjustment is transmitted along the second optical axis. 3. A lens barrel characterized in that it passes through the optical member 3 and the second optical member, passes through the lens barrel and is emitted to the outside through the opening. 前記屈曲光学素子の保持部材を備え、
前記光学調整が行われた前記第２の光学部材が前記保持部材に固定されることを特徴とする請求項１記載のレンズ鏡筒。 A holding member for the bending optical element;
The lens barrel according to claim 1, wherein the second optical member subjected to the optical adjustment is fixed to the holding member. 前記保持部材は、前記光源からの光を通すために形成した開口部を有し、
前記第２の光学部材が固定された前記保持部材の前記開口部には、前記第２の光軸に沿う光を遮光する遮光部材が取り付けられていることを特徴とする請求項２記載のレンズ鏡筒。 The holding member has an opening formed to pass light from the light source,
The lens according to claim 2, wherein a light shielding member that shields light along the second optical axis is attached to the opening of the holding member to which the second optical member is fixed. A lens barrel. 前記第１の光学部材を保持して前記第１の光軸に沿って撮影位置と収納位置との間を移動する可動部と、
前記屈曲光学素子及び前記第２の光学部材を保持して前記第２の光軸に沿って移動する保持部材と、
前記第２の光軸に沿って移動する前記第３の光学部材又は該第３の光学部材とともに移動する部材をさらに備え、
前記第３の光学部材又は該第３の光学部材とともに移動する部材が前記第２の光軸に沿って移動する際、前記収納位置への前記可動部の移動を規制することにより、前記第３の光学部材又は該第３の光学部材とともに移動する部材と前記可動部との干渉を防止する規制手段を前記保持部材に設けたことを特徴とする請求項１記載のレンズ鏡筒。 A movable part that holds the first optical member and moves between a photographing position and a storage position along the first optical axis;
A holding member that holds the bending optical element and the second optical member and moves along the second optical axis;
A third optical member that moves along the second optical axis or a member that moves together with the third optical member;
When the third optical member or a member that moves together with the third optical member moves along the second optical axis, the movement of the movable portion to the storage position is restricted, thereby the third optical member. 2. The lens barrel according to claim 1, wherein the holding member is provided with restricting means for preventing interference between the optical member or a member that moves together with the third optical member and the movable portion. 前記保持部材は前記第１の光軸と直交する前記第２の光軸に沿って移動し、
前記第１の光軸の方向における前記規制手段と前記可動部との距離が、前記第１の光軸の方向における前記第３の光学部材又は該第３の光学部材とともに移動する部材と前記可動部との距離よりも小さいことを特徴とする請求項４記載のレンズ鏡筒。 The holding member moves along the second optical axis perpendicular to the first optical axis;
The distance between the restricting means and the movable portion in the direction of the first optical axis is the third optical member in the direction of the first optical axis or a member that moves together with the third optical member and the movable The lens barrel according to claim 4, wherein the lens barrel is smaller than a distance to the portion. 請求項１から５のいずれか１項に記載のレンズ鏡筒と、
前記第２の光軸上に配置された撮像素子を備えたことを特徴とする撮像装置。 The lens barrel according to any one of claims 1 to 5,
An imaging apparatus comprising: an imaging element disposed on the second optical axis. 前記屈曲光学素子の保持部材は、前記撮像素子の側に、前記第２の光学部材の粗調整を行うために該第２の光学部材を保持する保持部を有することを特徴とする請求項６記載の撮像装置。   The holding member of the bending optical element has a holding part for holding the second optical member in order to perform rough adjustment of the second optical member on the imaging element side. The imaging device described. 第１の光軸上に配置される第１の光学部材と、第２の光軸上に配置される光学調整可能な第２の光学部材と、前記第１の光軸から前記第２の光軸へと光路を変更する屈曲光学素子と、前記第２の光軸上に配置される第３の光学部材を備えたレンズ鏡筒にて前記第２の光学部材の光学調整を行う光学調整方法であって、
前記第２の光軸上に前記第２の光学部材を配置した状態で、該第２の光学部材の光学調整に用いる光源及び調整用チャートを配置し、前記光源から前記調整用チャートを介して前記第２の光軸に沿って前記第３の光学部材及び第２の光学部材を通り、前記レンズ鏡筒を貫通してその開口部から外部に出射した光を検出する検出手段を配置するステップと、
前記検出手段に結像する前記調整用チャートの検出像に基づき、前記第２の光軸と直交する方向にて前記第２の光学部材の位置を調整するステップを有することを特徴とする光学調整方法。 A first optical member disposed on the first optical axis; an optically adjustable second optical member disposed on the second optical axis; and the second light from the first optical axis. Optical adjustment method for optically adjusting the second optical member with a lens barrel including a bending optical element that changes the optical path to the axis and a third optical member disposed on the second optical axis Because
In a state where the second optical member is arranged on the second optical axis, a light source and an adjustment chart used for optical adjustment of the second optical member are arranged, and from the light source via the adjustment chart A step of disposing detection means for detecting light that passes through the third optical member and the second optical member along the second optical axis, passes through the lens barrel, and is emitted to the outside from the opening; When,
And a step of adjusting the position of the second optical member in a direction orthogonal to the second optical axis based on a detection image of the adjustment chart formed on the detection means. Method.

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