JP5410797B2 - Zoom lens with anti-vibration function - Google Patents
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Description
本発明は、デジタルカメラ、銀塩カメラ、ビデオカメラ等に用いられるズームレンズ、特に防振機能を有するズームレンズに関する。 The present invention relates to a zoom lens used for a digital camera, a silver salt camera, a video camera, and the like, and more particularly to a zoom lens having a vibration isolation function.
４倍程度の変倍比を有し、防振機能を有するズームレンズとして、以下に示す特許文献が開示されている。 The following patent documents are disclosed as zoom lenses having a zoom ratio of about 4 times and having an anti-vibration function.
特許文献１には、物体側より像側へ順に、正の屈折力の第１レンズ群Ｌ１、負の屈折力の第２レンズ群Ｌ２、ズーミングに際して移動する第３レンズ群Ｌ３を含み、全ズーム範囲中にて全体として正の屈折力の後続レンズ群ＬＢより成り、特に第２レンズ群Ｌ２は、、単一の負レンズより成る第２ｓレンズ群Ｌ２ｓと、正レンズと負レンズを含み全体として負の屈折力の第２ｍレンズ群Ｌ２ｍとで構成され、第２ｍレンズ群Ｌ２ｍを光軸に対し垂直方向の成分を持つように変位させることで防振を行うズームレンズが開示されている。
特許文献２には、正、負、正、正、負の５つのレンズ群を有し、３つの可動群で変倍を行い、第２レンズ群と第４レンズ群は固定とし、第２レンズ群を光軸に対して略垂直方向に移動させて防振を行うズームレンズが開示されている。
特許文献３には、物体側から順に、正屈折力の第１レンズ群Ｇ１と、負屈折力の第２レンズ群Ｇ２と、正屈折力の第３レンズ群Ｇ３を有し、第３レンズ群は、物体側から順に、正屈折力の第３１レンズ群Ｇ３１と、負屈折力の第３２レンズ群Ｇ３２と、第３３レンズ群Ｇ３３とからなり、第３２レンズ群のみを光軸と直交方向に移動させることにより防振を行うズームレンズが開示されている。
特許文献４には、物体側から像側へ順に、正の屈折力の第１レンズ群と、負の屈折力の第２レンズ群と、正の屈折力の第３レンズ群とを有し、第２レンズ群は光軸方向と垂直方向の成分を持つように移動して防振を行うズームレンズが開示されている。
特許文献１に記載のズームレンズは、少なくとも３つのレンズ群から構成されるが、実施例１のレンズ光学系は、４群構成のズームレンズであり、シンプルな構成となっている。
The zoom lens described in
しかし、第２レンズ群はズーミング時に像面に対し固定であるが、第２レンズ群のうち像面側のレンズ群のみを防振用レンズ群として使用しているため、機構が複雑になってしまっている。 However, the second lens group is fixed with respect to the image plane during zooming, but only the lens group on the image plane side of the second lens group is used as an anti-vibration lens group, which complicates the mechanism. I'm stuck.
また第３レンズ群の内部に開口絞りを有しているため、第３レンズ群の構成を分割しなければならない。したがって、メカ構成パーツが多くなった分メカ構造が複雑となり、コスト抑制が困難となる。実施例２及び実施例３のレンズ光学系においては、開口絞りを第３レンズ群の後ろにおいているが、より多群のレンズ光学系となっており、メカ構造が複雑化している。 Since the third lens group has an aperture stop, the configuration of the third lens group must be divided. Therefore, the mechanical structure becomes complicated as the number of mechanical component parts increases, and it becomes difficult to control costs. In the lens optical systems of Example 2 and Example 3, the aperture stop is located behind the third lens group. However, the lens optical system is a multi-group lens optical system, and the mechanical structure is complicated.
特許文献２に記載のズームレンズは、５群構成のズームレンズであり、変倍時において第２レンズ群及び第４レンズ群を固定とし、光軸上で移動させ無いことによって機構を簡易にしている。
The zoom lens described in
しかし、広角端状態のズームレンズ全長が、広角端の焦点距離に対して長いため、レンズ系全体が大きくなっており、小型化することが困難である。 However, since the entire length of the zoom lens at the wide-angle end is longer than the focal length at the wide-angle end, the entire lens system is large and it is difficult to reduce the size.
特許文献３に記載のズームレンズは、ズームレンズ全長が短く小型化されており、また、変倍時に移動するレンズ群は３つであるため、シンプルなレンズ光学系となっている。
The zoom lens described in
しかし、フォーカス方式が、第１レンズ群Ｇ１の構成要素である像面側の第１２レンズ群Ｇ１２を移動させるインナーフォーカス方式であること、さらに、第３レンズ群を３つの補助レンズ群に分割し、その中央の第２補助レンズ群を防振用レンズ群としていることから、変倍時に移動するレンズ群は３つであるにもかかわらず、機構部品が増加し、コストダウンが困難となっている。
また、３分割された第３レンズ群の中央に位置するレンズ群を防振用レンズ群とすることは、防振用レンズ群の前後のレンズ群の光軸合わせを機構上困難としている。
However, the focus method is an inner focus method in which the twelfth lens group G12 on the image plane side, which is a component of the first lens group G1, is moved, and the third lens group is divided into three auxiliary lens groups. Since the second auxiliary lens group at the center is an anti-vibration lens group, although there are three lens groups that move during zooming, the number of mechanical parts increases, making it difficult to reduce costs. Yes.
In addition, when the lens group located at the center of the third lens group divided into three is used as an anti-vibration lens group, it is mechanically difficult to align the optical axes of the lens groups before and after the anti-vibration lens group.
特許文献４に記載のズームレンズは、広角端状態のズームレンズ全長が、広角端の焦点距離に対して長いため、レンズ系全体が大きくなっており、小型化することが困難である。
In the zoom lens described in
本発明は、上記課題を解決し、機構部品が少なくコストを抑え、小型で、光学性能が良好な防振機能を有するズームレンズを提供することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a zoom lens having an anti-vibration function that has fewer mechanical parts, reduces cost, is small, and has good optical performance.
上記課題を解決するために、本発明に係る第１の発明は、物体側より順に、正の屈折力を有する第１レンズ群、負の屈折力を有する第２レンズ群、正の屈折力を有する第３レンズ群及び正の屈折力を有する第４レンズ群で構成され、
各レンズ群の間隔を変化させて変倍を行い、
前記第１レンズ群を光軸に沿って物体側へ移動させることにより無限遠物体から近距離物体に合焦させ、
前記第２レンズ群を光軸に対して略垂直方向に移動させることにより像を光軸に対して略垂直方向に移動させ、
以下の条件を満足することを特徴とする防振機能を有するズーム比４倍以上のズームレンズを提供する。
（１）１．８≦ｆ１／ｆｗ≦２．０
（２）０．４≦ｆｗ／ＬＴｗ≦０．５
（３）０．６６≦ＭＬ３／ＭＬ４≦０．７８
ｆ１：前記第１レンズ群の焦点距離
ｆｗ：広角端におけるズームレンズ全系の焦点距離
ＬＴｗ：広角端でのズームレンズ全長
ＭＬ３：広角端から望遠端までの前記第３レンズ群の移動量
ＭＬ４：広角端から望遠端までの前記第４レンズ群の移動量
In order to solve the above-mentioned problem, the first invention according to the present invention is arranged in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power. A third lens group having a fourth lens group having positive refractive power,
Magnification by changing the interval between each lens group,
By moving the first lens group along the optical axis toward the object side, the object from infinity is focused on a short distance object,
Moving the second lens group in a direction substantially perpendicular to the optical axis to move the image in a direction substantially perpendicular to the optical axis;
Provided is a zoom lens having an anti-vibration function that satisfies the following conditions and having a zoom ratio of 4 times or more .
(1) 1.8 ≦ f1 / fw ≦ 2.0
(2) 0.4 ≦ fw / LTw ≦ 0.5
(3) 0.66 ≦ ML3 / ML4 ≦ 0.78
f1: Focal length of the first lens group fw: Focal length of the entire zoom lens system at the wide angle end LTw: Full length of the zoom lens at the wide angle end ML3: Movement amount ML4 of the third lens group from the wide angle end to the telephoto end: Movement amount of the fourth lens group from the wide-angle end to the telephoto end
また、本発明に係る第２の発明は、前記第３レンズ群の物体側に開口絞りが配置されていることを特徴とする第１の発明の防振機能を有するズーム比４倍以上のズームレンズを提供する。 According to a second aspect of the present invention, there is provided a zoom having a zoom ratio of 4 times or more having an image stabilization function according to the first aspect, wherein an aperture stop is disposed on the object side of the third lens group. Provide a lens.
また、本発明に係る第３の発明は、以下の条件を満足することを特徴とする第１の発明又は第２の発明の防振機能を有するズーム比４倍以上のズームレンズを提供する。
（４）０．３＜｜βｗ２｜＜０．４
βｗ２：前記第２レンズ群の横倍率
According to a third aspect of the present invention, there is provided a zoom lens having a zoom ratio of 4 times or more, which has the image stabilization function of the first or second aspect, satisfying the following conditions.
(4) 0.3 <| βw2 | <0.4
βw2: lateral magnification of the second lens group
本発明によれば、機構部品が少なくコストを抑え、小型で、光学性能が良好な防振機能を有するズームレンズを提供することができる。 According to the present invention, it is possible to provide a zoom lens having a vibration-proof function that has few mechanical parts, reduces cost, is small, and has good optical performance.
本発明の防振機能を有するズームレンズは、物体側より順に正の屈折力を有する第１レンズ群、負の屈折力を有する第２レンズ群、正の屈折力を有する第３レンズ群及び正の屈折力を有する第４レンズ群から構成される。また、各レンズ群の間隔を変化させることにより変倍を行い、無限遠物体から近距離物体に合焦させる場合に前記第１レンズ群を光軸に沿って物体側に移動させる。さらに、前記第２レンズ群を光軸に対して略垂直方向に移動させることで、像を光軸に対して略垂直方向に移動させる。 The zoom lens having an image stabilization function of the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a positive lens in order from the object side. 4th lens group which has the refractive power of this. Further, zooming is performed by changing the interval between the lens groups, and the first lens group is moved to the object side along the optical axis when focusing from an object at infinity to an object at a short distance. Further, by moving the second lens group in a direction substantially perpendicular to the optical axis, the image is moved in a direction substantially perpendicular to the optical axis.
本発明の防振機能を有するズームレンズのレンズ光学系において、第１レンズ群の焦点距離を短く設計することにより、変倍の場合にもフォーカシングの場合にも、第１レンズ群の移動量を小さくして移動機構を簡易にすることができ、また、ズームレンズ全長を短くすることができる。 In the lens optical system of the zoom lens having the image stabilization function according to the present invention, the amount of movement of the first lens unit can be reduced in both zooming and focusing by designing the focal length of the first lens unit to be short. The moving mechanism can be simplified by reducing the size, and the entire length of the zoom lens can be shortened.
しかし、第１レンズ群の焦点距離が短く設計しすぎると、第１レンズ群で発生する収差、特に球面収差がアンダーになったり、軸上色収差が大きくなってしまう。そこで次の条件式を満足することが望ましい。 However, if the focal length of the first lens group is too short, aberrations generated by the first lens group, particularly spherical aberration, will be under, and axial chromatic aberration will be large. Therefore, it is desirable to satisfy the following conditional expression.
（１）１．８≦ｆ１／ｆｗ≦２．０
（２）０．４≦ｆｗ／ＬＴｗ≦０．５
ｆ１：前記第１レンズ群の焦点距離
ｆｗ：広角端におけるズームレンズ全系の焦点距離
ＬＴｗ：広角端でのズームレンズ全長
(1) 1.8 ≦ f1 / fw ≦ 2.0
(2) 0.4 ≦ fw / LTw ≦ 0.5
f1: Focal length of the first lens unit fw: Focal length of the entire zoom lens system at the wide angle end LTw: Full length of the zoom lens at the wide angle end
条件式（１）は、第１レンズ群と広角端におけるズームレンズ全系との焦点距離の比率を定めるものである。条件式（１）の上限値を越えると第１レンズ群の焦点距離が相対的に長くなり、球面収差や軸上色収差の補正には有利であるが、変倍時やフォーカシング時の第１レンズ群の移動量が大きくなり、この移動量を確保するための機構が複雑になり、ズームレンズの小型化が困難になる。条件式（１）の下限値を越えると第１レンズ群の焦点距離は相対的に短くなり、変倍時やフォーカシング時の第１レンズ群の移動量が小さくなり、ズームレンズの小型化が可能となるが、球面収差がアンダーになり、軸上色収差が大きく発生し、ズームレンズの光学性能を良好に補正することができなくなる。 Conditional expression (1) defines the ratio of the focal length between the first lens group and the entire zoom lens system at the wide angle end. If the upper limit of conditional expression (1) is exceeded, the focal length of the first lens group becomes relatively long, which is advantageous for correcting spherical aberration and longitudinal chromatic aberration, but the first lens at the time of zooming or focusing The amount of movement of the group becomes large, the mechanism for securing this amount of movement becomes complicated, and it becomes difficult to reduce the size of the zoom lens. When the lower limit of conditional expression (1) is exceeded, the focal length of the first lens group becomes relatively short, the amount of movement of the first lens group during zooming and focusing becomes small, and the zoom lens can be miniaturized. However, the spherical aberration becomes under, the axial chromatic aberration is greatly generated, and the optical performance of the zoom lens cannot be corrected well.
条件式（２）は、広角端におけるズームレンズ全系の焦点距離と広角端でのズームレンズ全長との比率を定めるものである。条件式（２）の上限値を越えると広角端におけるズームレンズ全系の焦点距離に対してズームレンズ全長が短くなりすぎるため、ズームレンズの各レンズ群の屈折力が強くなり、各レンズ群で発生する収差量が多くなって収差補正が困難にとなる。条件式（２）の下限値を越えると広角端におけるズームレンズ全系の焦点距離に対してズームレンズ全長が長くなりすぎるため、ズームレンズの小型化を達成できない。 Conditional expression (2) defines the ratio between the focal length of the entire zoom lens system at the wide-angle end and the total length of the zoom lens at the wide-angle end. If the upper limit of conditional expression (2) is exceeded, the total length of the zoom lens becomes too short with respect to the focal length of the entire zoom lens system at the wide-angle end, so that the refractive power of each lens group of the zoom lens becomes strong. The amount of aberration that occurs increases and aberration correction becomes difficult. If the lower limit value of conditional expression (2) is exceeded, the overall length of the zoom lens becomes too long with respect to the focal length of the entire zoom lens system at the wide-angle end, so that the zoom lens cannot be reduced in size.
また、本発明のズームレンズにおいて、第３レンズ群の物体側に開口絞りを配置することで、開口絞りがレンズ群の内部にあるよりも組立てが容易となり、製造コストを抑えることができる。さらに、第３レンズ群の物体側に開口絞りを配置することで、中間像高での有害光線をカットし易くなり、光学性能を良好にすることができる。 Further, in the zoom lens of the present invention, by disposing the aperture stop on the object side of the third lens group, it is easier to assemble than when the aperture stop is inside the lens group, and the manufacturing cost can be reduced. Furthermore, by disposing the aperture stop on the object side of the third lens group, it becomes easy to cut harmful rays at the intermediate image height, and the optical performance can be improved.
また、本発明のズームレンズにおいて、広角端から望遠端までの変倍時の第３レンズ群の移動量ＭＬ３、第４レンズ群の移動量ＭＬ４は、次の条件式（３）を満足することが望ましい。 In the zoom lens of the present invention, the movement amount ML3 of the third lens group and the movement amount ML4 of the fourth lens group at the time of zooming from the wide angle end to the telephoto end satisfy the following conditional expression (3). Is desirable.
（３）０．６≦ＭＬ３／ＭＬ４＜１．０
ＭＬ３：広角端から望遠端までの前記第３レンズ群の移動量
ＭＬ４：広角端から望遠端までの前記第４レンズ群の移動量
(3) 0.6 ≦ ML3 / ML4 <1.0
ML3: amount of movement of the third lens group from the wide-angle end to the telephoto end ML4: amount of movement of the fourth lens group from the wide-angle end to the telephoto end
条件式（３）は、広角端から望遠端までの変倍時の第３レンズ群の移動量ＭＬ３と、第４レンズ群の移動量ＭＬ４との比率を定めるものである。
条件式（３）の上限値を越えると第３レンズ群の移動量ＭＬ３が大きくなるため、第２レンズ群と第３レンズ群の間隔を広くとらなければならず、ズームレンズの大型化を招いてしまう。条件式（３）の下限値を越えると第３レンズ群の移動量ＭＬ３は小さくなるが、第３レンズ群の倍率負担が大きくなるため、正のコマ収差が発生してしまう。
Conditional expression (3) defines the ratio between the movement amount ML3 of the third lens group and the movement amount ML4 of the fourth lens group during zooming from the wide-angle end to the telephoto end.
If the upper limit value of conditional expression (3) is exceeded, the movement amount ML3 of the third lens group becomes large. Therefore, the distance between the second lens group and the third lens group must be widened, resulting in an increase in the size of the zoom lens. I will. When the lower limit value of conditional expression (3) is exceeded, the movement amount ML3 of the third lens group decreases, but the magnification burden on the third lens group increases, and positive coma aberration occurs.
また、本発明のズームレンズにおいて、第２レンズ群の横倍率は、次の条件式（４）を満足することが望ましい。 In the zoom lens of the present invention, it is desirable that the lateral magnification of the second lens group satisfies the following conditional expression (4).
（４）０．３＜｜βｗ２｜＜０．４
βｗ２：前記第２レンズ群の横倍率
(4) 0.3 <| βw2 | <0.4
βw2: lateral magnification of the second lens group
条件式（４）は、第２レンズ群の横倍率を定めるものである。条件式（４）の上限値を越えると第２レンズ群の屈折力が強くなり、第２レンズ群により跳ね上げられる光線が高くなるので、第２レンズ群の像面側に位置する開口絞り径を大きくしなければならない。その結果、ズームレンズの大型化を招く。条件式（４）の下限値を越えると防振敏感度が大きくなりすぎるため、防振レンズ群である第２レンズ群の制御が困難となる。 Conditional expression (4) defines the lateral magnification of the second lens group. When the upper limit of conditional expression (4) is exceeded, the refractive power of the second lens group becomes strong, and the light beam jumped up by the second lens group becomes high, so that the aperture stop diameter located on the image plane side of the second lens group Must be increased. As a result, the zoom lens is increased in size. If the lower limit of conditional expression (4) is exceeded, the anti-vibration sensitivity becomes too high, and it becomes difficult to control the second lens group which is the anti-vibration lens group.
以下に本発明のズームレンズに係る数値実施例１及び数値実施例２を示す。 Numerical Example 1 and Numerical Example 2 according to the zoom lens of the present invention are shown below.
各数値実施例において、全体諸元中のｆは焦点距離、ＦｎｏはＦナンバー、２ωは画角を示す。また、レンズ諸元中の番号は物体側からのレンズの面番号、Ｒはレンズ面の曲率半径、Ｄはレンズ面間隔、ｎｄはｄ線の屈折率、νｄはｄ線のアッベ数を示す。また、Ｂｆはバックフォーカス、Ｏｂｊは被写体からレンズ第１面までの距離を示す。図中のｄ線、ｇ線、Ｃ線はそれぞれの波長に対する収差であり、ΔＳはサジタル像面、ΔＭはメリジオナル像面を示す。 In each numerical example, f in the overall specifications indicates a focal length, Fno indicates an F number, and 2ω indicates an angle of view. The numbers in the lens specifications are the surface number of the lens from the object side, R is the radius of curvature of the lens surface, D is the distance between the lens surfaces, nd is the refractive index of the d-line, and νd is the Abbe number of the d-line. Bf represents the back focus, and Obj represents the distance from the subject to the first lens surface. In the drawing, d-line, g-line, and C-line are aberrations with respect to respective wavelengths, ΔS indicates a sagittal image plane, and ΔM indicates a meridional image plane.
（数値実施例１）
（数値実施例２）
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
ＳＰ 開口絞り
ＩＰ 像面
ｄ ｄ線
ｇ ｇ線
Ｃ Ｃ線
ΔＳ サジタル像面
ΔＭ メリジオナル像面
L1 1st lens group L2 2nd lens group L3 3rd lens group L4 4th lens group SP Aperture stop IP Image surface d d line g g line C C line ΔS Sagittal image surface ΔM Meridional image surface
Claims (3)
各レンズ群の間隔を変化させて変倍を行い、
前記第１レンズ群を光軸に沿って物体側へ移動させることにより無限遠物体から近距離物体に合焦させ、
前記第２レンズ群を光軸に対して略垂直方向に移動させることにより像を光軸に対して略垂直方向に移動させ、
以下の条件を満足することを特徴とする防振機能を有するズーム比４倍以上のズームレンズ。
（１）１．８≦ｆ１／ｆｗ≦２．０
（２）０．４≦ｆｗ／ＬＴｗ≦０．５
（３）０．６６≦ＭＬ３／ＭＬ４≦０．７８
ｆ１：前記第１レンズ群の焦点距離
ｆｗ：広角端におけるズームレンズ全系の焦点距離
ＬＴｗ：広角端でのズームレンズ全長
ＭＬ３：広角端から望遠端までの前記第３レンズ群の移動量
ＭＬ４：広角端から望遠端までの前記第４レンズ群の移動量 In order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power. And
Magnification by changing the interval between each lens group,
By moving the first lens group along the optical axis toward the object side, the object from infinity is focused on a short distance object,
Moving the second lens group in a direction substantially perpendicular to the optical axis to move the image in a direction substantially perpendicular to the optical axis;
A zoom lens having an anti-vibration function and satisfying the following conditions and having a zoom ratio of 4 times or more .
(1) 1.8 ≦ f1 / fw ≦ 2.0
(2) 0.4 ≦ fw / LTw ≦ 0.5
(3) 0.66 ≦ ML3 / ML4 ≦ 0.78
f1: Focal length of the first lens group fw: Focal length of the entire zoom lens system at the wide angle end LTw: Full length of the zoom lens at the wide angle end ML3: Movement amount ML4 of the third lens group from the wide angle end to the telephoto end: Movement amount of the fourth lens group from the wide-angle end to the telephoto end
（４）０．３＜｜βｗ２｜＜０．４
βｗ２：前記第２レンズ群の横倍率率 The zoom lens according to claim 1 or 2, wherein the zoom lens having an anti-vibration function and having a zoom ratio of 4 times or more satisfies the following condition.
(4) 0.3 <| βw2 | <0.4
βw2: lateral magnification ratio of the second lens group
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| DE102018116415B4 (en) | 2017-07-10 | 2020-08-06 | Canon Kabushiki Kaisha | ZOOM LENS AND IMAGE RECORDER |
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