JP2010211102A - Inner zoom type and inner focus type zoom lens having vibration-proofing function - Google Patents
Inner zoom type and inner focus type zoom lens having vibration-proofing function Download PDFInfo
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本発明は、特にデジタルカメラ、銀塩カメラ及びビデオカメラ等に用いられる防振機能を有するズームレンズに関するものである。 The present invention relates to a zoom lens having an anti-vibration function, particularly used in digital cameras, silver salt cameras, video cameras, and the like.
３倍程度のズーム比を有し、防振機能を備えたズームレンズとして、例えば以下の特許文献が挙げられる。 As a zoom lens having a zoom ratio of about 3 times and having an anti-vibration function, for example, the following patent documents can be cited.
しかしながら、一般的に、特許文献１や２のような、所謂負先行型ズームレンズでは、フォーカス方式として前玉繰り出し方式を採用しているために操作性を損なう問題及び、ズーム時とフォーカス時に全長が変化するため、防塵・防滴対策が困難であるという問題があった。
However, in general, in so-called negative leading zoom lenses such as
また、特許文献３のような、所謂正先行型ズームレンズでは、インナーフォーカス方式のためフォーカス時の全長変化はないが、ズーム時においては全長変化があるため防塵・防滴対策が不十分であるという問題があった。
In addition, in the so-called front leading zoom lens as in
上記の課題を解決するため、本発明では、物体側から像側へ順に、負の屈折力を有する第１レンズ群Ｌ１と、負の屈折力を有する第２レンズ群Ｌ２と、正の屈折力を有する第３レンズ群Ｌ３と、負の屈折力を有する第４レンズ群Ｌ４と、正の屈折力を有する第５レンズ群Ｌ５とから構成される防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズであって、広角側から望遠側へのズーミングにおいて該第１レンズ群Ｌ１は像面に対して固定であり、該第２レンズ群Ｌ２は任意に移動し、該第３レンズ群Ｌ３は該第２レンズ群Ｌ２との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４と該第３レンズ群Ｌ３との間隔が大きくなり、該第５レンズ群Ｌ５は該第４レンズ群Ｌ４との間隔が小さくなるよう物体側へ移動し、該第３レンズ群Ｌ３は物体側から順に，正レンズから成る第３ａレンズ成分Ｌ３ａと、全体として正の屈折力の第３ｂレンズ成分Ｌ３ｂとから成り、該第３ａレンズ成分Ｌ３ａを光軸に対して略垂直方向に移動させることで、光軸に対して略垂直方向に像を移動させることが可能であり、物体距離無限遠から近距離物体へフォーカスする際、該第２レンズ群Ｌ２が物体側へ移動し、以下の条件式を満足することを特徴とする防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズ。
０．１＜｜ｆｗ／ｆ３ａ｜＜０．４ （１）
ただし、
ｆ３ａは前記第３ａレンズ成分Ｌ３ａの焦点距離、
ｆｗは無限遠での広角端の焦点距離である。
In order to solve the above problems, in the present invention, in order from the object side to the image side, the first lens unit L1 having negative refractive power, the second lens unit L2 having negative refractive power, and the positive refractive power. An inner zoom type and an inner focus type having an anti-vibration function including a third lens unit L3 having a negative refractive power, a fourth lens unit L4 having a negative refractive power, and a fifth lens unit L5 having a positive refractive power The first lens unit L1 is fixed with respect to the image plane during zooming from the wide-angle side to the telephoto side, the second lens unit L2 arbitrarily moves, and the third lens unit L3. Moves to the object side so that the distance between the second lens group L2 and the fourth lens group L4 increases, and the fifth lens group L5 increases the fourth lens group L5. The distance from the lens unit L4 is reduced. The third lens unit L3 is moved to the body side, and the third lens unit L3 includes, in order from the object side, a third-a lens component L3a including a positive lens and a third-b lens component L3b having a positive refractive power as a whole, and the third-a lens component L3a. By moving the lens in a direction substantially perpendicular to the optical axis, it is possible to move the image in a direction substantially perpendicular to the optical axis. When focusing from an infinite object distance to a near object, the second lens An inner zoom type and inner focus type zoom lens having an image stabilization function, wherein the group L2 moves toward the object side and satisfies the following conditional expression:
0.1 <| fw / f3a | <0.4 (1)
However,
f3a is a focal length of the third-a lens component L3a,
fw is the focal length at the wide angle end at infinity.
また、前記第３ａレンズ成分Ｌ３ａは、少なくとも１つの非球面を有することが好ましい。 The third-a lens component L3a preferably has at least one aspheric surface.
物体側から像側へ順に、負の屈折力を有する第１レンズ群Ｌ１と、負の屈折力を有する第２レンズ群Ｌ２と、正の屈折力を有する第３レンズ群Ｌ３と、負の屈折力を有する第４レンズ群Ｌ４と、正の屈折力を有する第５レンズ群Ｌ５とから構成される防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズであって、広角側から望遠側へのズーミングにおいて該第１レンズ群Ｌ１は像面に対して固定であり、該第２レンズ群Ｌ２は任意に移動し、該第３レンズ群Ｌ３は該第２レンズ群Ｌ２との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４と該第３レンズ群Ｌ３との間隔が大きくなり、該第５レンズ群Ｌ５は該第４レンズ群Ｌ４との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４を光軸に対して略垂直方向に移動させることで、光軸に対して略垂直方向に像を移動させることが可能であり、物体距離無限遠から近距離物体へフォーカスする際、該第２レンズ群Ｌ２が物体側へ移動し、以下の条件式を満足することを特徴とする防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズを提供する。
０．６＜｜ｆ４／ｆｗ｜＜２．１ （２）
ただし、
ｆ４は前記第４レンズ群Ｌ４の焦点距離、
ｆｗは無限遠での広角端の焦点距離である。
In order from the object side to the image side, a first lens unit L1 having negative refractive power, a second lens unit L2 having negative refractive power, a third lens unit L3 having positive refractive power, and negative refraction An inner zoom type and inner focus type zoom lens having an anti-vibration function composed of a fourth lens unit L4 having power and a fifth lens unit L5 having positive refractive power, from the wide angle side to the telephoto side During zooming, the first lens unit L1 is fixed with respect to the image plane, the second lens unit L2 moves arbitrarily, and the third lens unit L3 has a small distance from the second lens unit L2. So that the distance between the fourth lens unit L4 and the third lens unit L3 increases, and the fifth lens unit L5 decreases so that the interval between the fourth lens unit L4 and the fourth lens unit L4 decreases. To the fourth lens unit L4 It is possible to move the image in a direction substantially perpendicular to the optical axis by moving in a direction substantially perpendicular to the optical axis. When focusing from an infinite object distance to a near object, the second lens unit L2 Provided is an inner zoom type and inner focus type zoom lens having an anti-vibration function, wherein the zoom lens moves toward the object side and satisfies the following conditional expression.
0.6 <| f4 / fw | <2.1 (2)
However,
f4 is a focal length of the fourth lens unit L4,
fw is the focal length at the wide angle end at infinity.
また、前記第４レンズ群Ｌ４は、少なくとも１つの非球面を有することが好ましい。 The fourth lens unit L4 preferably has at least one aspheric surface.
物体側から像側へ順に、負の屈折力を有する第１レンズ群Ｌ１と、負の屈折力を有する第２レンズ群Ｌ２と、正の屈折力を有する第３レンズ群Ｌ３と、負の屈折力を有する第４レンズ群Ｌ４と、正の屈折力を有する第５レンズ群Ｌ５とから構成される防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズであって、広角側から望遠側へのズーミングにおいて該第１レンズ群Ｌ１は像面に対して固定であり、該第２レンズ群Ｌ２は任意に移動し、該第３レンズ群Ｌ３は該第２レンズ群Ｌ２との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４と該第３レンズ群Ｌ３との間隔が大きくなり、該第５レンズ群Ｌ５は該第４レンズ群Ｌ４との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４は、物体側から順に、負の屈折力の第４ａレンズ成分Ｌ４ａと、全体として負の屈折力の第４ｂレンズ成分Ｌ４ｂとから成り、該第４ｂレンズ成分Ｌ４ｂを光軸に対して略垂直方向に移動させることで、光軸に対して略垂直方向に像を移動させることが可能であり、物体距離無限遠から近距離物体へフォーカスする際、該第２レンズ群Ｌ２が物体側へ移動し、以下の条件式を満足することを特徴とする防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズを提供する。
０．２＜｜ｆｗ／ｆ４ｂ｜＜０．６ （３）
ただし、
ｆ４ｂは前記第４ｂレンズ成分Ｌ４ｂの焦点距離、
ｆｗは無限遠での広角端の焦点距離である。
In order from the object side to the image side, a first lens unit L1 having negative refractive power, a second lens unit L2 having negative refractive power, a third lens unit L3 having positive refractive power, and negative refraction An inner zoom type and inner focus type zoom lens having an anti-vibration function composed of a fourth lens unit L4 having power and a fifth lens unit L5 having positive refractive power, from the wide angle side to the telephoto side During zooming, the first lens unit L1 is fixed with respect to the image plane, the second lens unit L2 moves arbitrarily, and the third lens unit L3 has a small distance from the second lens unit L2. So that the distance between the fourth lens unit L4 and the third lens unit L3 increases, and the fifth lens unit L5 decreases so that the interval between the fourth lens unit L4 and the fourth lens unit L4 decreases. The fourth lens unit L4 moves to In order from the body side, the lens includes a 4a lens component L4a having a negative refractive power and a 4b lens component L4b having a negative refractive power as a whole, and the fourth b lens component L4b is moved in a direction substantially perpendicular to the optical axis. Thus, it is possible to move the image in a direction substantially perpendicular to the optical axis. When focusing from infinity to a near object, the second lens unit L2 moves to the object side, and the following conditions are satisfied. An inner zoom type and an inner focus type zoom lens having an anti-vibration function characterized by satisfying the expression are provided.
0.2 <| fw / f4b | <0.6 (3)
However,
f4b is a focal length of the fourth b lens component L4b,
fw is the focal length at the wide angle end at infinity.
また、前記第４ｂレンズ成分Ｌ４ｂは、少なくとも１つの非球面を有することが好ましい。 The fourth b lens component L4b preferably has at least one aspheric surface.
また、前記第１レンズ群Ｌ１は、光軸からレンズ周辺に向かい正の屈折力が強くなる、あるいは負の屈折力が弱くなる、少なくとも１つの非球面を有し、以下の条件式を満足することが好ましい。
３．０＜｜ｆ１／ｆ１２ｗ｜＜８．８ （４）
ただし、
ｆ１は前記第１レンズ群Ｌ１の焦点距離、
ｆ１２ｗは無限遠時の広角端における前記第１レンズ群Ｌ１と前記第２レンズ群Ｌ２との合成系の焦点距離である。
The first lens unit L1 has at least one aspheric surface in which the positive refractive power increases from the optical axis toward the lens periphery or the negative refractive power decreases, and satisfies the following conditional expression: It is preferable.
3.0 <| f1 / f12w | <8.8 (4)
However,
f1 is a focal length of the first lens unit L1,
f12w is a focal length of the synthesis system of the first lens unit L1 and the second lens unit L2 at the wide angle end at infinity.
また、前記第２レンズ群Ｌ２は以下の条件式を満足することが好ましい。
１．０＜｜ｆ２／ｆ１２ｗ｜＜２．４ （５）
ただし、
ｆ２は前記第２レンズ群Ｌ２の焦点距離、
ｆ１２ｗは無限遠時の広角端における第１レンズ群と第２レンズ群との合成系の焦点距離である。
The second lens unit L2 preferably satisfies the following conditional expression.
1.0 <| f2 / f12w | <2.4 (5)
However,
f2 is a focal length of the second lens unit L2,
f12w is the focal length of the combined system of the first lens group and the second lens group at the wide angle end at infinity.
本発明により、ズーム時の全長が固定され、更にインナーフォーカス化することが可能となる。また、ズーム時の全長が変わらないためレンズ鏡筒の密閉性が向上し、防塵・防滴対策に最適な防振機能を有したズームレンズを提供することが可能となる。 According to the present invention, the total length during zooming is fixed, and further inner focusing can be achieved. In addition, since the total length during zooming does not change, the sealing of the lens barrel is improved, and it is possible to provide a zoom lens having an anti-vibration function that is optimal for measures against dust and water.
以下、本発明の実施形態に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズについて説明する。 Hereinafter, an inner zoom type and inner focus type zoom lens having an anti-vibration function according to an embodiment of the present invention will be described.
本実施形態に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズは、物体側から像側へ順に、負の屈折力を有する第１レンズ群Ｌ１と、負の屈折力を有する第２レンズ群Ｌ２と、正の屈折力を有する第３レンズ群Ｌ３と、負の屈折力を有する第４レンズ群Ｌ４と、正の屈折力を有する第５レンズ群Ｌ５とから構成される防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズであって、広角側から望遠側へのズーミングにおいて該第１レンズ群Ｌ１は像面に対して固定であり、該第２レンズ群Ｌ２は任意に移動し、該第３レンズ群Ｌ３は該第２レンズ群Ｌ２との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４と該第３レンズ群Ｌ３との間隔が大きくなり、該第５レンズ群Ｌ５は該第４レンズ群Ｌ４との間隔が小さくなるよう物体側へ移動し、該第３レンズ群Ｌ３は物体側から順に，正レンズから成る第３ａレンズ成分Ｌ３ａと、全体として正の屈折力の第３ｂレンズ成分Ｌ３ｂから成り、該第３ａレンズ成分Ｌ３ａを光軸に対して略垂直方向に移動させることで、光軸に対して略垂直方向に像を移動させることが可能であり、物体距離無限遠から近距離物体へフォーカスする際、該第２レンズ群Ｌ２が物体側へ移動し、以下の条件式を満足することを特徴とする防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズ。
０．１＜｜ｆｗ／ｆ３ａ｜＜０．４ （１）
ただし、
ｆ３ａは前記第３ａレンズ成分Ｌ３ａの焦点距離、
ｆｗは無限遠での広角端の焦点距離である。
An inner zoom type and inner focus type zoom lens having an image stabilization function according to the present embodiment, in order from the object side to the image side, a first lens unit L1 having a negative refractive power, and a first lens unit having a negative refractive power. Anti-vibration composed of a two-lens group L2, a third lens group L3 having a positive refractive power, a fourth lens group L4 having a negative refractive power, and a fifth lens group L5 having a positive refractive power A zoom lens of an inner zoom type and an inner focus type having a function, wherein the first lens unit L1 is fixed with respect to the image plane during zooming from the wide-angle side to the telephoto side, and the second lens unit L2 is arbitrary The third lens group L3 moves toward the object side so that the distance between the second lens group L2 and the distance between the fourth lens group L4 and the third lens group L3 increases. The The fifth lens unit L5 moves toward the object side so that the distance from the fourth lens unit L4 is reduced, and the third lens unit L3 is arranged in order from the object side to the third-a lens component L3a including a positive lens, and as a whole positive. It is possible to move the image in a direction substantially perpendicular to the optical axis by moving the 3a lens component L3a in a direction substantially perpendicular to the optical axis. An inner zoom type and an inner focus having an anti-vibration function characterized in that the second lens unit L2 moves toward the object side when focusing from an infinite object distance to an object at a short distance, and satisfies the following conditional expression: Type of zoom lens.
0.1 <| fw / f3a | <0.4 (1)
However,
f3a is a focal length of the third-a lens component L3a,
fw is the focal length at the wide angle end at infinity.
条件式（１）は第３ａレンズ成分の焦点距離を規定したものであり、条件式（１）の上限値を超え、第３ａレンズ成分の焦点距離が短くなると、防振時における偏芯コマ収差と倍率色収差の補正が困難となる。 Conditional expression (1) defines the focal length of the third-a lens component. When the upper limit value of conditional expression (1) is exceeded and the focal length of the third-a lens component becomes shorter, decentering coma aberration at the time of image stabilization It becomes difficult to correct the lateral chromatic aberration.
また、条件式（１）の下限値を超え、第３ａレンズ成分の焦点距離が長くなると、防振敏感度が低くなるため、防振時における第３ａレンズ成分の移動量が増大し、制御が困難となり、防振駆動パーツが大型化してしまう。 Further, if the lower limit of conditional expression (1) is exceeded and the focal length of the 3a lens component is increased, the vibration proof sensitivity is lowered. Therefore, the amount of movement of the 3a lens component at the time of vibration reduction is increased, and control is performed. It becomes difficult and the vibration-proof drive parts become large.
また、前記第３ａレンズ成分Ｌ３ａは、少なくとも１つの非球面を有することで、防振時の、偏芯コマ収差や非点収差の発生を抑制し、結像性能の劣化を小さく抑える。 In addition, the third-a lens component L3a has at least one aspheric surface, thereby suppressing the occurrence of decentration coma and astigmatism during image stabilization and minimizing the degradation of imaging performance.
物体側から像側へ順に、負の屈折力を有する第１レンズ群Ｌ１と、負の屈折力を有する第２レンズ群Ｌ２と、正の屈折力を有する第３レンズ群Ｌ３と、負の屈折力を有する第４レンズ群Ｌ４と、正の屈折力を有する第５レンズ群Ｌ５とから構成される防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズであって、広角側から望遠側へのズーミングにおいて該第１レンズ群Ｌ１は像面に対して固定であり、該第２レンズ群Ｌ２は任意に移動し、該第３レンズ群Ｌ３は該第２レンズ群Ｌ２との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４と該第３レンズ群Ｌ３との間隔が大きくなり、該第５レンズ群Ｌ５は該第４レンズ群Ｌ４との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４を光軸に対して略垂直方向に移動させることで、光軸に対して略垂直方向に像を移動させることが可能であり、物体距離無限遠から近距離物体へフォーカスする際、該第２レンズ群Ｌ２が物体側へ移動し、以下の条件式を満足することを特徴とする防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズ。
０．６＜｜ｆ４／ｆｗ｜＜２．１ （２）
ただし、
ｆ４は前記第４レンズ群Ｌ４の焦点距離、
ｆｗは無限遠での広角端の焦点距離である。
In order from the object side to the image side, a first lens unit L1 having negative refractive power, a second lens unit L2 having negative refractive power, a third lens unit L3 having positive refractive power, and negative refraction An inner zoom type and inner focus type zoom lens having an anti-vibration function composed of a fourth lens unit L4 having power and a fifth lens unit L5 having positive refractive power, from the wide angle side to the telephoto side During zooming, the first lens unit L1 is fixed with respect to the image plane, the second lens unit L2 moves arbitrarily, and the third lens unit L3 has a small distance from the second lens unit L2. So that the distance between the fourth lens unit L4 and the third lens unit L3 increases, and the fifth lens unit L5 decreases so that the interval between the fourth lens unit L4 and the fourth lens unit L4 decreases. To the fourth lens unit L4 It is possible to move the image in a direction substantially perpendicular to the optical axis by moving in a direction substantially perpendicular to the optical axis. When focusing from an infinite object distance to a near object, the second lens unit L2 An inner zoom type and an inner focus type zoom lens having an anti-vibration function, wherein the zoom lens moves toward the object side and satisfies the following conditional expression.
0.6 <| f4 / fw | <2.1 (2)
However,
f4 is a focal length of the fourth lens unit L4,
fw is the focal length at the wide angle end at infinity.
条件式（２）は、前記第４レンズ群の焦点距離を規定したものであり、条件式（２）の下限値を超え、前記第４レンズ群の焦点距離が絶対値で短くなると、防振時の偏芯コマ収差の補正が困難となる。 Conditional expression (2) defines the focal length of the fourth lens group. When the lower limit of conditional expression (2) is exceeded and the focal length of the fourth lens group becomes shorter in absolute value, image stabilization is achieved. It becomes difficult to correct the eccentric coma at the time.
また、条件式（２）の上限値を超え、前記第４レンズ群の焦点距離が絶対値で長くなると、防振敏感度が低くなるため、防振時における第４レンズ群の移動量が増大し、防振駆動パーツが大型化してしまう。 Also, if the upper limit of conditional expression (2) is exceeded and the focal length of the fourth lens group becomes longer in absolute value, the vibration proof sensitivity becomes lower, and the amount of movement of the fourth lens group during vibration proof increases. In addition, the vibration-proof drive parts become large.
また、前記第４レンズ群Ｌ４は、少なくとも１つの非球面を有することで、防振時の、偏芯コマ収差の発生を抑制し、結像性能の劣化を小さく抑える。 In addition, the fourth lens unit L4 has at least one aspherical surface, thereby suppressing the occurrence of decentering coma during image stabilization and minimizing the deterioration in imaging performance.
物体側から像側へ順に、負の屈折力を有する第１レンズ群Ｌ１と、負の屈折力を有する第２レンズ群Ｌ２と、正の屈折力を有する第３レンズ群Ｌ３と、負の屈折力を有する第４レンズ群Ｌ４と、正の屈折力を有する第５レンズ群Ｌ５とから構成される防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズであって、広角側から望遠側へのズーミングにおいて該第１レンズ群Ｌ１は像面に対して固定であり、該第２レンズ群Ｌ２は任意に移動し、該第３レンズ群Ｌ３は該第２レンズ群Ｌ２との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４と該第３レンズ群Ｌ３との間隔が大きくなり、該第５レンズ群Ｌ５は該第４レンズ群Ｌ４との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４は、物体側から順に、負レンズから成る第４ａレンズ成分Ｌ４ａと、全体として負の屈折力の第４ｂレンズ成分Ｌ４ｂとから成り、該第４ｂレンズ成分Ｌ４ｂを光軸に対して略垂直方向に移動させることで、光軸に対して略垂直方向に像を移動させることが可能であり、物体距離無限遠から近距離物体へフォーカスする際、該第２レンズ群Ｌ２が物体側へ移動し、以下の条件式を満足することを特徴とする防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズ。
０．２＜｜ｆｗ／ｆ４ｂ｜＜０．６ （３）
ただし、
ｆ４ｂは前記第４ｂレンズ成分Ｌ４ｂの焦点距離、
ｆｗは無限遠での広角端の焦点距離である。
In order from the object side to the image side, a first lens unit L1 having negative refractive power, a second lens unit L2 having negative refractive power, a third lens unit L3 having positive refractive power, and negative refraction An inner zoom type and inner focus type zoom lens having an anti-vibration function composed of a fourth lens unit L4 having power and a fifth lens unit L5 having positive refractive power, from the wide angle side to the telephoto side During zooming, the first lens unit L1 is fixed with respect to the image plane, the second lens unit L2 moves arbitrarily, and the third lens unit L3 has a small distance from the second lens unit L2. So that the distance between the fourth lens unit L4 and the third lens unit L3 increases, and the fifth lens unit L5 decreases so that the interval between the fourth lens unit L4 and the fourth lens unit L4 decreases. The fourth lens unit L4 moves to In order from the body side, the lens includes a fourth lens component L4a composed of a negative lens and a fourth lens component L4b having a negative refractive power as a whole, and moves the fourth lens component L4b in a direction substantially perpendicular to the optical axis. Thus, the image can be moved in a direction substantially perpendicular to the optical axis. When focusing from infinity to a near object, the second lens unit L2 moves to the object side, and the following conditional expression An inner zoom type and an inner focus type zoom lens having an anti-vibration function.
0.2 <| fw / f4b | <0.6 (3)
However,
f4b is a focal length of the fourth b lens component L4b,
fw is the focal length at the wide angle end at infinity.
条件式（３）は、前記第４ｂレンズ成分の焦点距離を規定したものであり、条件式（３）の下限値を超え、前記第４ｂレンズ成分の焦点距離が絶対値で長くなると、防振時の偏芯コマ収差の補正が困難となる。また、条件式（３）の上限値を超え、前記第４ｂレンズ成分の焦点距離が絶対値で短くなると、防振敏感度が低くなるため、防振時における第４ｂレンズ成分の移動量が増大し、防振駆動パーツが大型化してしまう。 Conditional expression (3) defines the focal length of the 4b lens component. When the lower limit of conditional expression (3) is exceeded and the focal length of the 4b lens component is increased in absolute value, image stabilization is achieved. It becomes difficult to correct the eccentric coma at the time. Also, if the upper limit of conditional expression (3) is exceeded and the focal length of the 4b lens component is shortened in absolute value, the vibration proof sensitivity decreases, and the amount of movement of the 4b lens component during vibration proof increases. In addition, the vibration-proof drive parts become large.
また、前記第４ｂレンズ成分Ｌ４ｂは、少なくとも１つの非球面を有することで、防振時の、偏芯コマ収差の発生を抑制し、結像性能の劣化を小さく抑える。 In addition, the fourth b lens component L4b has at least one aspherical surface, thereby suppressing the occurrence of decentration coma during the image stabilization and minimizing the deterioration of the imaging performance.
前記第１レンズ群は光軸からレンズ周辺に向かい正の屈折力が強くなる、あるいは負の屈折力が弱くなる、少なくとも１つの非球面を有することにより、広角側での負の歪曲収差補正を少ないレンズ枚数により実現する。また、前記第１レンズ群を物体側より順に負、正の構成にすることで、前玉径を上げることなく広角側での負の歪曲収差補正をし易くなる。 The first lens group has at least one aspheric surface in which the positive refractive power increases from the optical axis toward the lens periphery, or the negative refractive power decreases, thereby correcting negative distortion on the wide angle side. Realized with a small number of lenses. In addition, by making the first lens group negative and positive in order from the object side, it becomes easy to correct negative distortion on the wide angle side without increasing the front lens diameter.
前記第１レンズ群は以下の条件式を満足することを特徴とする。
３．０＜｜ｆ１／ｆ１２ｗ｜＜８．８ （４）
ただし、
ｆ１は前記第１レンズ群Ｌ１の焦点距離、
ｆ１２ｗは無限遠時の広角端における前記第１レンズ群Ｌ１と前記第２レンズ群Ｌ２との合成系の焦点距離である。
The first lens group satisfies the following conditional expression.
3.0 <| f1 / f12w | <8.8 (4)
However,
f1 is a focal length of the first lens unit L1,
f12w is a focal length of the synthesis system of the first lens unit L1 and the second lens unit L2 at the wide angle end at infinity.
条件式（４）は前記第１レンズ群Ｌ１の焦点距離を規定し、小型化と高性能化とを両立させるためのものである。条件式（４）の下限値を超え、前記第１レンズ群Ｌ１の焦点距離が絶対値で短くなると、広角側における負の歪曲収差の補正が困難となる。 Conditional expression (4) defines the focal length of the first lens unit L1, and achieves both miniaturization and high performance. When the lower limit value of conditional expression (4) is exceeded and the focal length of the first lens unit L1 becomes shorter in absolute value, it becomes difficult to correct negative distortion on the wide angle side.
また、条件式（４）の上限値を超え、前記第１レンズ群Ｌ１の焦点距離が絶対値で長くなると、前玉径を小型化することが困難となる。 If the upper limit of conditional expression (4) is exceeded and the focal length of the first lens unit L1 is increased in absolute value, it is difficult to reduce the front lens diameter.
前記第１レンズ群Ｌ１は以下の条件式を満足することを特徴とする。
１．０＜｜ｆ２／ｆ１２ｗ｜＜２．４ （５）
ただし、
ｆ２は前記第２レンズ群Ｌ２の焦点距離、
ｆ１２ｗは無限遠時の広角端における前記第１レンズ群Ｌ１と前記第２レンズ群Ｌ２との合成系の焦点距離である。
The first lens unit L1 satisfies the following conditional expression.
1.0 <| f2 / f12w | <2.4 (5)
However,
f2 is a focal length of the second lens unit L2,
f12w is a focal length of the synthesis system of the first lens unit L1 and the second lens unit L2 at the wide angle end at infinity.
条件式（５）は前記第２レンズ群Ｌ２の焦点距離を規定したものであり、条件式（４）と同様に高性能化と小型化とを両立させるためのものである。条件式（５）の下限値を超え、前記第２レンズ群Ｌ２の焦点距離が絶対値で短くなると、フォーカス時の収差変動、特に球面収差の補正が困難となる。また、前記第３レンズ群Ｌ３以降の変倍負担が大きくなるため、前記第３レンズ群Ｌ３以降の移動量が増大し、スペース確保が困難となる。さらに、移動量の増大によりズーム時における開放Ｆ値の変動が大きくなり、絞り径を可変にしなければ所定の開放Ｆ値を確保することが困難となる。 Conditional expression (5) defines the focal length of the second lens unit L2 and is intended to achieve both high performance and downsizing, similar to conditional expression (4). If the lower limit of conditional expression (5) is exceeded and the focal length of the second lens unit L2 becomes shorter in absolute value, it becomes difficult to correct aberration fluctuations during focusing, particularly spherical aberration. In addition, since the burden of zooming after the third lens unit L3 increases, the amount of movement after the third lens unit L3 increases, and it becomes difficult to secure a space. Furthermore, an increase in the amount of movement increases the variation of the open F value during zooming, and it becomes difficult to secure a predetermined open F value unless the aperture diameter is variable.
また、条件式（５）の上限値を超え、前記第２レンズ群Ｌ２の焦点距離が絶対値で長くなると、収差補正に対しては有利になるが、フォーカスのための繰り出し量が増大し、前記第１レンズ群Ｌ１と前記第２レンズ群Ｌ２との間のフォーカススペース確保が困難となり、小型化に不利となる。 If the upper limit of conditional expression (5) is exceeded and the focal length of the second lens unit L2 is increased in absolute value, it is advantageous for aberration correction, but the amount of extension for focusing increases. It is difficult to secure a focus space between the first lens unit L1 and the second lens unit L2, which is disadvantageous for downsizing.
以下、数値実施例に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズについて図面を元に説明する。 Hereinafter, an inner zoom type and inner focus type zoom lens having an image stabilization function according to numerical examples will be described with reference to the drawings.
図１は、実施例１に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの広角端におけるレンズ構成図である。 FIG. 1 is a lens configuration diagram at the wide-angle end of an inner zoom type and inner focus type zoom lens having an image stabilization function according to the first embodiment.
第３ａレンズ群は、光軸に対して略垂直方向に移動させることで、像面Ｉ上の像を光軸に対して略垂直方向に移動させることで像ぶれ補正が可能であり、物体側に凹面を向けた正の屈折力のメニスカスレンズからなる。 The 3a lens group can be moved in a direction substantially perpendicular to the optical axis, and image blur correction can be performed by moving an image on the image plane I in a direction substantially perpendicular to the optical axis. It consists of a meniscus lens with a positive refractive power and a concave surface facing the lens.
以下の表１に、実施例１に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの諸元値を示す。
［全体諸元］において、ｆは焦点距離、ＦｎｏはＦナンバー、２ωは画角（単位：°）を表す。［レンズ諸元］において、第１列Ｎは物体側から数えたレンズ面の順番、第２列Ｒはレンズ面の曲率半径、第３列Ｄはレンズ面間隔、第４列ｎはｄ線（波長λ＝５８７．６ｎｍ）での屈折率、第５列νはｄ線（波長λ＝５８７．６ｎｍ）でのアッベ数を表す。また、ｒ＝０．００００は平面を表し、Ｆｂはバックフォーカス、絞りは絞り面、フレアカット絞りはフレアカット絞り面を示し、＊印は非球面を示し、空気の屈折率ｎ＝１．００００はその記載を省略する。
［無限遠撮影時における可変間隔］には、焦点距離ｆと可変間隔を示す。［条件式対応値］には、各条件式の対応値を示す。
［非球面データ］には、面番号Ｎ、非球面の形状を次式で現した場合の非球面係数、コーニック係数を表す。
Table 1 below shows specification values of an inner zoom type and inner focus type zoom lens having an image stabilization function according to the first embodiment.
In [Overall specifications], f represents a focal length, Fno represents an F number, and 2ω represents an angle of view (unit: °). In [lens specifications], the first column N is the order of the lens surfaces counted from the object side, the second column R is the radius of curvature of the lens surfaces, the third column D is the lens surface interval, and the fourth column n is d-line ( The refractive index at the wavelength λ = 587.6 nm), the fifth column ν represents the Abbe number at the d-line (wavelength λ = 587.6 nm). Further, r = 0.0000 represents a plane, Fb represents a back focus, the diaphragm represents a diaphragm surface, the flare cut diaphragm represents a flare cut diaphragm surface, * represents an aspheric surface, and the refractive index of air n = 1.0000. Omits the description.
[Variable interval at infinity shooting] indicates the focal length f and the variable interval. [Conditional Expression Corresponding Value] indicates the corresponding value of each conditional expression.
[Aspherical data] represents the aspherical coefficient and the conic coefficient when the surface number N and the shape of the aspherical surface are expressed by the following equations.
ｘ＝（ｈ２／ｒ）／［１＋｛１−（１＋ｋ）（ｈ／ｒ）２｝１／２］＋Ａｈ４＋Ｂｈ６＋Ｃｈ８＋Ｄｈ１０ x = (h 2 / r) / [1+ {1− (1 + k) (h / r) 2 } 1/2 ] + Ah 4 + Bh 6 + Ch 8 + Dh 10
ただし、上式においてｘは、面の頂点を基準にしたときの光軸からの高さｈの位置での光軸方向の偏移であり、ｋはコーニック係数、Ａ、Ｂ、Ｃ、Ｄは非球面係数であり、ｒは基準球面の曲率半径である。また、表において「Ｅ‐ｎ」は「×１０‐ｎ」を示し、例えば「−４．７１６８Ｅ‐０６」は「−４．７１６８×１０‐６」を示す。なおこれらの符号は以降の実施例においても同様であるため実施例２以降の説明は省略する。 However, in the above equation, x is a shift in the optical axis direction at a position of height h from the optical axis with respect to the vertex of the surface, k is a conic coefficient, and A, B, C, D are The aspheric coefficient, r is the radius of curvature of the reference sphere. Furthermore, "E-n" in the table indicates "× 10 -n", for example "-4.7168E-06" indicates "-4.7168 × 10- 6". Since these symbols are the same in the following embodiments, the description after the second embodiment will be omitted.
以下の全ての諸元の値において、記載している焦点距離ｆ、曲率半径ｒ、レンズ面間隔ｄ、その他の長さは、特記のない場合「ｍｍ」を使用するが、光学系の比例拡大、比例縮小においても同等の光学性能が得られるのでこれに限られるものではない。なおこれらの符号は以降の実施例においても同様であるため実施例２以降の説明は省略する。 In all the following values, the described focal length f, radius of curvature r, lens surface interval d, and other lengths are “mm” unless otherwise specified, but proportional expansion of the optical system Even in proportional reduction, the same optical performance can be obtained, and the present invention is not limited to this. Since these symbols are the same in the following embodiments, the description after the second embodiment will be omitted.
以下の表に実施例１に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの諸元値を示す。 The following table shows the specifications of the inner zoom type and inner focus type zoom lenses having the image stabilization function according to the first embodiment.
図２は、実施例１に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの広角端における無限遠合焦時の縦収差図を示す。図３は、実施例１に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの望遠端における無限遠合焦時の縦収差図を示す。図４は実施例１に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの広角端における無限遠合焦時の横収差を示し、基準時（防振を行わないとき）の横収差図を示す。図５は防振レンズ群を光軸に対して垂直方向に＋０．５ｍｍ移動させた防振時の横収差図を示す。実施例１において、防振レンズ群は第３ａレンズ成分Ｌ３ａである。図６は防振レンズ群を光軸に対して垂直方向に−０．５ｍｍ移動させた防振時の横収差図を示す。図７は実施例１に係るインナーズーム且つインナーフォーカスタイプの防振機能を有するズームレンズの望遠端における無限遠合焦時の横収差を示し、基準時（防振を行わないとき）の横収差図を示す。図８は防振レンズ群を光軸に対して垂直方向に＋０．５ｍｍ移動させた防振時の横収差図を示す。図９は防振レンズ群を光軸に対して垂直方向に−０．５ｍｍ移動させた防振時の横収差図を示す。 FIG. 2 is a longitudinal aberration diagram of the inner zoom type and inner focus type zoom lens having the image stabilization function according to Example 1 when focusing at infinity at the wide angle end. FIG. 3 is a longitudinal aberration diagram at the telephoto end of the inner zoom type and inner focus type zoom lens having an anti-vibration function according to Example 1 when focusing on infinity. FIG. 4 shows lateral aberrations at the wide-angle end at the wide-angle end of the inner zoom type and inner focus type zoom lens having an image stabilization function according to Example 1, and the lateral aberration at the reference time (when no image stabilization is performed). An aberration diagram is shown. FIG. 5 is a lateral aberration diagram at the time of image stabilization in which the image stabilization lens group is moved +0.5 mm in a direction perpendicular to the optical axis. In Example 1, the anti-vibration lens group is the third-a lens component L3a. FIG. 6 is a lateral aberration diagram at the time of image stabilization in which the image stabilization lens group is moved by −0.5 mm in the direction perpendicular to the optical axis. FIG. 7 shows lateral aberrations when focusing at infinity at the telephoto end of the zoom lens having an inner zoom and inner focus type image stabilization function according to Example 1, and lateral aberrations at the reference time (when no image stabilization is performed). The figure is shown. FIG. 8 is a lateral aberration diagram at the time of image stabilization in which the image stabilization lens group is moved +0.5 mm in a direction perpendicular to the optical axis. FIG. 9 is a lateral aberration diagram during image stabilization in which the image stabilization lens group is moved by −0.5 mm in the direction perpendicular to the optical axis.
各収差図において、ＦｎｏはＦナンバー、Ｙは像高、ＣはＣ線（波長λ＝６５６．３ｎｍ）、ｄはｄ線（波長λ＝５８７．６ｎｍ）、ｇはｇ線（波長λ＝４３５．８ｎｍ）、ΔＭはメリジオナル像面、ΔＳはサジタル像面をそれぞれ示す。なおこれらの符号は以降の実施例においても同様であるため説明は省略する。 In each aberration diagram, Fno is the F number, Y is the image height, C is the C line (wavelength λ = 656.3 nm), d is the d line (wavelength λ = 587.6 nm), and g is the g line (wavelength λ = 435). .8 nm), ΔM represents a meridional image plane, and ΔS represents a sagittal image plane. Since these symbols are the same in the following embodiments, description thereof will be omitted.
図１０は、実施例２に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの広角端におけるレンズ構成図である。 FIG. 10 is a lens configuration diagram at the wide-angle end of the inner zoom type and inner focus type zoom lens having the image stabilization function according to the second embodiment.
前記第４レンズ群Ｌ４は、光軸に対して略垂直方向に移動させることで、像面Ｉ上の像を光軸に対して略垂直方向に移動させることで像ぶれ補正が可能であり、物体側から順に、両凹レンズと、負の両凹レンズと正の両凸レンズの接合レンズからなる。 The fourth lens unit L4 can be moved in a direction substantially perpendicular to the optical axis, and an image blur correction can be performed by moving the image on the image plane I in a direction substantially perpendicular to the optical axis. In order from the object side, the lens includes a biconcave lens, and a cemented lens of a negative biconcave lens and a positive biconvex lens.
以下の表２に、実施例２に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの諸元値を示す。 Table 2 below shows specification values of an inner zoom type and inner focus type zoom lens having an image stabilization function according to the second embodiment.
図１１は、実施例２に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの広角端における無限遠合焦時の縦収差図を示す。図１２は、実施例２に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの望遠端における無限遠合焦時の縦収差図を示す。図１３は実施例２に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの広角端における無限遠合焦時の横収差を示し、基準時（防振を行わないとき）の横収差図を示す。図１４は防振レンズ群を光軸に対して垂直方向に＋０．１５ｍｍ移動させた防振時の横収差図を示す。実施例２において、防振レンズ群は第４レンズ群Ｌ４である。図１５は防振レンズ群を光軸に対して垂直方向に−０．１５ｍｍ移動させた防振時の横収差図を示す。図１６は実施例２に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの望遠端における無限遠合焦時の横収差を示し、基準時（防振を行わないとき）の横収差図を示す。図１７は防振レンズ群を光軸に対して垂直方向に＋０．１５ｍｍ移動させた防振時の横収差図を示す。図１８は防振レンズ群を光軸に対して垂直方向に−０．１５ｍｍ移動させた防振時の横収差図を示す。 FIG. 11 is a longitudinal aberration diagram of the inner zoom type and inner focus type zoom lens having the image stabilization function according to Example 2 when focusing on infinity at the wide angle end. FIG. 12 is a longitudinal aberration diagram at the telephoto end of the inner zoom type and inner focus type zoom lens having an anti-vibration function according to Example 2 when focusing on infinity. FIG. 13 shows lateral aberrations when focusing at infinity at the wide-angle end of the zoom lens of the inner zoom type and inner focus type having an image stabilization function according to Example 2, and the lateral aberration at the reference time (when image stabilization is not performed). An aberration diagram is shown. FIG. 14 is a lateral aberration diagram at the time of image stabilization in which the image stabilization lens group is moved by +0.15 mm in the direction perpendicular to the optical axis. In Example 2, the anti-vibration lens group is the fourth lens group L4. FIG. 15 is a lateral aberration diagram at the time of image stabilization in which the image stabilization lens unit is moved by −0.15 mm in the direction perpendicular to the optical axis. FIG. 16 shows lateral aberrations when focusing at infinity at the telephoto end of the zoom lens of the inner zoom type and inner focus type having the image stabilization function according to Example 2, and the lateral aberration at the reference time (when image stabilization is not performed). An aberration diagram is shown. FIG. 17 is a lateral aberration diagram during image stabilization when the image stabilization lens unit is moved by +0.15 mm in a direction perpendicular to the optical axis. FIG. 18 is a lateral aberration diagram at the time of image stabilization in which the image stabilization lens group is moved by −0.15 mm in the direction perpendicular to the optical axis.
図１９は、実施例３に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの広角端におけるレンズ構成図である。 FIG. 19 is a lens configuration diagram at the wide-angle end of the inner zoom type and inner focus type zoom lens having the image stabilization function according to the third embodiment.
前記第４ｂレンズ成分は、光軸に対して略垂直方向に移動させることで、像面Ｉ上の像を光軸に対して略垂直方向に移動させることで像ぶれ補正が可能であり、物体側から順に、負の両凹レンズと正の両凸レンズの接合レンズからなる。 The fourth b lens component can be moved in a direction substantially perpendicular to the optical axis, and image blur correction can be performed by moving the image on the image plane I in a direction substantially perpendicular to the optical axis. In order from the side, it is composed of a cemented lens of a negative biconcave lens and a positive biconvex lens.
以下の表３に、実施例３に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの諸元値を示す。 Table 3 below shows specification values of the inner zoom type and inner focus type zoom lenses having the image stabilization function according to the third embodiment.
図２０は、実施例３に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの広角端における無限遠合焦時の縦収差図を示す。図２１は、実施例３に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの望遠端における無限遠合焦時の縦収差図を示す。図２２は実施例３に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの広角端における無限遠合焦時の横収差を示し、基準時（防振を行わないとき）の横収差図を示す。図２３は防振レンズ群を光軸に対して垂直方向に＋０．３ｍｍ移動させた防振時の横収差図を示す。実施例３において、防振レンズ群は第４ｂレンズ成分Ｌ４ｂである。図２４は防振レンズ群を光軸に対して垂直方向に−０．３ｍｍ移動させた防振時の横収差図を示す。図２５は実施例３に係る防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズの望遠端における無限遠合焦時の横収差を示し、基準時（防振を行わないとき）の横収差図を示す。図２６は防振レンズ群を光軸に対して垂直方向に＋０．３ｍｍ移動させた防振時の横収差図を示す。図２７は防振レンズ群を光軸に対して垂直方向に−０．３ｍｍ移動させた防振時の横収差図を示す。 FIG. 20 is a longitudinal aberration diagram of the inner zoom type and inner focus type zoom lens having the image stabilization function according to Example 3 when focusing on infinity at the wide angle end. FIG. 21 is a longitudinal aberration diagram at the telephoto end of the inner zoom type and inner focus type zoom lens having the image stabilization function according to Example 3 at the time of focusing on infinity. FIG. 22 shows lateral aberrations when focusing at infinity at the wide-angle end of the zoom lens of the inner zoom type and inner focus type having an image stabilization function according to Example 3, and the lateral aberration at the reference time (when image stabilization is not performed). An aberration diagram is shown. FIG. 23 is a lateral aberration diagram at the time of image stabilization in which the image stabilization lens group is moved +0.3 mm in a direction perpendicular to the optical axis. In Example 3, the anti-vibration lens group is the 4b lens component L4b. FIG. 24 is a lateral aberration diagram during image stabilization when the image stabilization lens group is moved by -0.3 mm in the direction perpendicular to the optical axis. FIG. 25 shows lateral aberrations when focusing at infinity at the telephoto end of the inner zoom type and inner focus type zoom lens having the image stabilization function according to Example 3, and the lateral aberration at the reference time (when image stabilization is not performed). An aberration diagram is shown. FIG. 26 is a lateral aberration diagram during image stabilization when the image stabilization lens group is moved +0.3 mm in a direction perpendicular to the optical axis. FIG. 27 is a lateral aberration diagram during image stabilization when the image stabilization lens unit is moved by -0.3 mm in the direction perpendicular to the optical axis.
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
Ｌ５ 第５レンズ群
Ｓ 開口絞り
ＦＣ１ フレアカット絞り
ＦＣ２ フレアカット絞り
Ｉ 像面
ｄ ｄ線
Ｃ Ｃ線
ｇ ｇ線
Ｆｎｏ Ｆナンバー
ΔＳ サジタル像面
ΔＭ メリジオナル像面
Ｙ 像高
L1 1st lens group L2 2nd lens group L3 3rd lens group L4 4th lens group L5 5th lens group S Aperture stop FC1 Flare cut stop FC2 Flare cut stop I Image plane d d line C C line g g line Fno F Number ΔS Sagittal image plane ΔM Meridional image plane Y Image height
Claims (8)
広角側から望遠側へのズーミングにおいて該第１レンズ群Ｌ１は像面に対して固定であり、該第２レンズ群Ｌ２は任意に移動し、該第３レンズ群Ｌ３は該第２レンズ群Ｌ２との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４と該第３レンズ群Ｌ３との間隔が大きくなり、該第５レンズ群Ｌ５は該第４レンズ群Ｌ４との間隔が小さくなるよう物体側へ移動し、該第３レンズ群Ｌ３は物体側から順に，正レンズから成る第３ａレンズ成分Ｌ３ａと、全体として正の屈折力の第３ｂレンズ成分Ｌ３ｂとから成り、該第３ａレンズ成分Ｌ３ａを光軸に対して略垂直方向に移動させることで、光軸に対して略垂直方向に像を移動させることが可能であり、物体距離無限遠から近距離物体へフォーカスする際、該第２レンズ群Ｌ２が物体側へ移動し、以下の条件式を満足することを特徴とする防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズ。
０．１＜｜ｆｗ／ｆ３ａ｜＜０．４ （１）
ただし、
ｆ３ａは前記第３ａレンズ成分Ｌ３ａの焦点距離、
ｆｗは無限遠での広角端の焦点距離である。 In order from the object side to the image side, a first lens unit L1 having negative refractive power, a second lens unit L2 having negative refractive power, a third lens unit L3 having positive refractive power, and negative refraction An inner zoom type and inner focus type zoom lens having an anti-vibration function including a fourth lens unit L4 having power and a fifth lens unit L5 having positive refractive power,
In zooming from the wide-angle side to the telephoto side, the first lens unit L1 is fixed with respect to the image plane, the second lens unit L2 is arbitrarily moved, and the third lens unit L3 is moved to the second lens unit L2. The distance between the fourth lens unit L4 and the third lens unit L3 is increased, and the fifth lens unit L5 is spaced apart from the fourth lens unit L4. The third lens unit L3 is composed of a 3a lens component L3a composed of a positive lens and a 3b lens component L3b having a positive refractive power as a whole, in order from the object side. By moving the 3a lens component L3a in a direction substantially perpendicular to the optical axis, it is possible to move the image in a direction substantially perpendicular to the optical axis. When focusing from an object distance of infinity to a near object, The second lens unit L2 moves toward the object side Dynamic and, inner zoom type and inner focus type zoom lens system with a vibration reduction function and satisfies the following conditional expression.
0.1 <| fw / f3a | <0.4 (1)
However,
f3a is a focal length of the third-a lens component L3a,
fw is the focal length at the wide angle end at infinity.
広角側から望遠側へのズーミングにおいて該第１レンズ群Ｌ１は像面に対して固定であり、該第２レンズ群Ｌ２は任意に移動し、該第３レンズ群Ｌ３は該第２レンズ群Ｌ２との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４と該第３レンズ群Ｌ３との間隔が大きくなり、該第５レンズ群Ｌ５は該第４レンズ群Ｌ４との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４を光軸に対して略垂直方向に移動させることで、光軸に対して略垂直方向に像を移動させることが可能であり、物体距離無限遠から近距離物体へフォーカスする際、該第２レンズ群Ｌ２が物体側へ移動し、以下の条件式を満足することを特徴とする防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズ。
０．６＜｜ｆ４／ｆｗ｜＜２．１ （２）
ただし、
ｆ４は前記第４レンズ群Ｌ４の焦点距離、
ｆｗは無限遠での広角端の焦点距離である。 In order from the object side to the image side, a first lens unit L1 having negative refractive power, a second lens unit L2 having negative refractive power, a third lens unit L3 having positive refractive power, and negative refraction An inner zoom type and inner focus type zoom lens having an anti-vibration function including a fourth lens unit L4 having power and a fifth lens unit L5 having positive refractive power,
In zooming from the wide-angle side to the telephoto side, the first lens unit L1 is fixed with respect to the image plane, the second lens unit L2 is arbitrarily moved, and the third lens unit L3 is moved to the second lens unit L2. The distance between the fourth lens unit L4 and the third lens unit L3 is increased, and the fifth lens unit L5 is spaced apart from the fourth lens unit L4. It is possible to move the image in a direction substantially perpendicular to the optical axis by moving the fourth lens unit L4 in a direction substantially perpendicular to the optical axis by moving toward the object side so as to be small. When focusing from infinity to a short distance object, the second lens unit L2 moves to the object side, and satisfies the following conditional expression. lens.
0.6 <| f4 / fw | <2.1 (2)
However,
f4 is a focal length of the fourth lens unit L4,
fw is the focal length at the wide angle end at infinity.
広角側から望遠側へのズーミングにおいて該第１レンズ群Ｌ１は像面に対して固定であり、該第２レンズ群Ｌ２は任意に移動し、該第３レンズ群Ｌ３は該第２レンズ群Ｌ２との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４と該第３レンズ群Ｌ３との間隔が大きくなり、該第５レンズ群Ｌ５は該第４レンズ群Ｌ４との間隔が小さくなるよう物体側へ移動し、該第４レンズ群Ｌ４は、物体側から順に、負レンズから成る第４ａレンズ成分Ｌ４ａと、全体として負の屈折力の第４ｂレンズ成分Ｌ４ｂとから成り、該第４ｂレンズ成分Ｌ４ｂを光軸に対して略垂直方向に移動させることで、光軸に対して略垂直方向に像を移動させることが可能であり、物体距離無限遠から近距離物体へフォーカスする際、該第２レンズ群Ｌ２が物体側へ移動し、以下の条件式を満足することを特徴とする防振機能を有するインナーズームタイプ且つインナーフォーカスタイプのズームレンズ。
０．２＜｜ｆｗ／ｆ４ｂ｜＜０．６ （３）
ただし、
ｆ４ｂは前記第４ｂレンズ成分Ｌ４ｂの焦点距離、
ｆｗは無限遠での広角端の焦点距離である。 In order from the object side to the image side, a first lens unit L1 having negative refractive power, a second lens unit L2 having negative refractive power, a third lens unit L3 having positive refractive power, and negative refraction An inner zoom type and inner focus type zoom lens having an anti-vibration function including a fourth lens unit L4 having power and a fifth lens unit L5 having positive refractive power,
In zooming from the wide-angle side to the telephoto side, the first lens unit L1 is fixed with respect to the image plane, the second lens unit L2 is arbitrarily moved, and the third lens unit L3 is moved to the second lens unit L2. The distance between the fourth lens unit L4 and the third lens unit L3 is increased, and the fifth lens unit L5 is spaced apart from the fourth lens unit L4. The fourth lens unit L4 is composed of a 4a lens component L4a composed of a negative lens and a 4b lens component L4b having a negative refractive power as a whole, in order from the object side. By moving the 4b lens component L4b in a direction substantially perpendicular to the optical axis, the image can be moved in a direction substantially perpendicular to the optical axis. When focusing from an infinite object distance to a near object, The second lens unit L2 is on the object side Move, inner zoom type and inner focus type zoom lens system with a vibration reduction function and satisfies the following conditional expression.
0.2 <| fw / f4b | <0.6 (3)
However,
f4b is a focal length of the fourth b lens component L4b,
fw is the focal length at the wide angle end at infinity.
３．０＜｜ｆ１／ｆ１２ｗ｜＜８．８ （４）
ただし、
ｆ１は前記第１レンズ群Ｌ１の焦点距離、
ｆ１２ｗは無限遠時の広角端における前記第１レンズ群Ｌ１と前記第２レンズ群Ｌ２との合成系の焦点距離である。 The first lens unit L1 has at least one aspherical surface in which the positive refractive power increases from the optical axis toward the lens periphery or the negative refractive power decreases, and satisfies the following conditional expression: 7. An inner zoom type and an inner focus type zoom lens having an anti-vibration function according to claim 1.
3.0 <| f1 / f12w | <8.8 (4)
However,
f1 is a focal length of the first lens unit L1,
f12w is a focal length of the synthesis system of the first lens unit L1 and the second lens unit L2 at the wide angle end at infinity.
１．０＜｜ｆ２／ｆ１２ｗ｜＜２．４ （５）
ただし、
ｆ２は前記第２レンズ群Ｌ２の焦点距離、
ｆ１２ｗは無限遠時の広角端における前記第１レンズ群Ｌ１と前記第２レンズ群Ｌ２との合成系の焦点距離である。 The zoom lens of an inner zoom type and an inner focus type having an image stabilization function according to any one of claims 1 to 7, wherein the second lens unit L1 satisfies the following conditional expression.
1.0 <| f2 / f12w | <2.4 (5)
However,
f2 is a focal length of the second lens unit L2,
f12w is a focal length of the synthesis system of the first lens unit L1 and the second lens unit L2 at the wide angle end at infinity.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012022019A (en) * | 2010-07-12 | 2012-02-02 | Panasonic Corp | Zoom lens system, exchange lens device and camera system |
| JP2012173420A (en) * | 2011-02-18 | 2012-09-10 | Olympus Imaging Corp | Zoom lens |
| JP2014142596A (en) * | 2012-12-28 | 2014-08-07 | Ricoh Co Ltd | Zoom lens for projection |
| JP2014142595A (en) * | 2012-12-28 | 2014-08-07 | Ricoh Co Ltd | Image display device |
| US9097884B2 (en) | 2011-02-18 | 2015-08-04 | Olympus Imaging Corp. | Zoom lens |
| JP2016012083A (en) * | 2014-06-30 | 2016-01-21 | 株式会社タムロン | Optical system and image capturing device |
| JP2016126279A (en) * | 2015-01-08 | 2016-07-11 | 株式会社タムロン | Optical system and image capturing device |
| WO2016121966A1 (en) * | 2015-01-30 | 2016-08-04 | 株式会社ニコン | Variable magnification optical system, optical instrument and method of manufacturing variable magnification optical system |
| JP2019109539A (en) * | 2019-03-04 | 2019-07-04 | 株式会社タムロン | Optical system and imaging apparatus |
| CN114488485A (en) * | 2022-02-14 | 2022-05-13 | 合肥埃科光电科技股份有限公司 | Large-target-surface wide-angle low-distortion industrial lens of f22mm |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04116613A (en) * | 1990-09-07 | 1992-04-17 | Canon Inc | Wide angle zoom lens |
| JPH11167063A (en) * | 1997-12-04 | 1999-06-22 | Canon Inc | Zoom lens |
| JPH11231220A (en) * | 1998-02-13 | 1999-08-27 | Canon Inc | Optical magnification system having vibration proofing function |
| JP2002311330A (en) * | 2001-04-18 | 2002-10-23 | Canon Inc | Zoom lens and optical apparatus using the same |
| JP2004061910A (en) * | 2002-07-30 | 2004-02-26 | Canon Inc | Zoom lens provided with vibration-proofing function |
| JP2005352057A (en) * | 2004-06-09 | 2005-12-22 | Canon Inc | Zoom lens and imaging apparatus having same |
| JP2007078834A (en) * | 2005-09-12 | 2007-03-29 | Canon Inc | Zoom lens and imaging apparatus having the same |
| JP2007286601A (en) * | 2006-03-24 | 2007-11-01 | Nikon Corp | Zoom lens, imaging apparatus and method for varying focal length |
| JP2009014766A (en) * | 2007-06-29 | 2009-01-22 | Nikon Corp | Variable power optical system, optical apparatus, and power changing method for variable power optical system |
-
2009
- 2009-03-12 JP JP2009059247A patent/JP5358229B2/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04116613A (en) * | 1990-09-07 | 1992-04-17 | Canon Inc | Wide angle zoom lens |
| JPH11167063A (en) * | 1997-12-04 | 1999-06-22 | Canon Inc | Zoom lens |
| JPH11231220A (en) * | 1998-02-13 | 1999-08-27 | Canon Inc | Optical magnification system having vibration proofing function |
| JP2002311330A (en) * | 2001-04-18 | 2002-10-23 | Canon Inc | Zoom lens and optical apparatus using the same |
| JP2004061910A (en) * | 2002-07-30 | 2004-02-26 | Canon Inc | Zoom lens provided with vibration-proofing function |
| JP2005352057A (en) * | 2004-06-09 | 2005-12-22 | Canon Inc | Zoom lens and imaging apparatus having same |
| JP2007078834A (en) * | 2005-09-12 | 2007-03-29 | Canon Inc | Zoom lens and imaging apparatus having the same |
| JP2007286601A (en) * | 2006-03-24 | 2007-11-01 | Nikon Corp | Zoom lens, imaging apparatus and method for varying focal length |
| JP2009014766A (en) * | 2007-06-29 | 2009-01-22 | Nikon Corp | Variable power optical system, optical apparatus, and power changing method for variable power optical system |
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