JP2005284099A - Variable focal length lens - Google Patents
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- JP2005284099A JP2005284099A JP2004099807A JP2004099807A JP2005284099A JP 2005284099 A JP2005284099 A JP 2005284099A JP 2004099807 A JP2004099807 A JP 2004099807A JP 2004099807 A JP2004099807 A JP 2004099807A JP 2005284099 A JP2005284099 A JP 2005284099A
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本発明は、フィルムまたは固体撮像素子を用いる一眼レフカメラ用の可変焦点距離レンズに関し、特に第２レンズ群を移動させてフォーカシングをおこなう可変焦点距離レンズに関する。 The present invention relates to a variable focal length lens for a single-lens reflex camera using a film or a solid-state imaging device, and more particularly to a variable focal length lens that performs focusing by moving a second lens group.
従来、可変焦点距離レンズのフォーカシング（合焦）方法として、最も物体側の第１レンズ群を繰り出す方法が広く用いられている。この方法は、フォーカシング時の第１レンズ群の繰り出し量が焦点距離によらず、物体距離（物体から像面までの距離）で決まるという利点があることや、フォーカシング機構の簡素化に有利であことから、広く用いられている。しかしながら、フォーカシングでの移動群が露出しているため外部からの力が加わった場合にフォーカス機構、特にオートフォーカス機構に悪影響を及ぼすという問題がある。 Conventionally, as a focusing method for the variable focal length lens, a method of extending the first lens unit closest to the object side is widely used. This method has the advantage that the amount of extension of the first lens unit during focusing is determined by the object distance (the distance from the object to the image plane) regardless of the focal length, and is advantageous for simplifying the focusing mechanism. Therefore, it is widely used. However, since the moving group in focusing is exposed, there is a problem that when an external force is applied, the focus mechanism, particularly the autofocus mechanism, is adversely affected.
また、フォーカシングの際、第１レンズ群以外のレンズ群を移動させる可変焦点距離レンズも数多く提案されているが、焦点距離によってフォーカシング移動量が大きく変化するという問題がある。 In addition, many variable focal length lenses that move a lens group other than the first lens group during focusing have been proposed, but there is a problem that the amount of focusing movement varies greatly depending on the focal length.
これらの問題点を解決する方法として、正屈折力の第１レンズ群と、負屈折力の第２レンズ群と、負屈折力の第３レンズ群と、正屈折力の第４レンズ群を有する可変焦点距離レンズにおいて、第２レンズ群を移動させてフォーカシングする際、広角端状態におけるフォーカシング移動量と望遠端状態におけるフォーカシング移動量との差（以後、焦点距離によるフォーカシング移動量の差と記す）の少ないものが提案されている（例えば、特許文献１、特許文献２参照。）。
特許文献１の第２実施例は、正屈折力の第１レンズ群と、負屈折力の第２レンズ群と、負屈折力の第３レンズ群と、正屈折力の第４レンズ群と、正屈折力の第５レンズ群から構成され、広角端状態から望遠端状態への変倍に際して、第１レンズ群と第５レンズ群が固定され、第２レンズ群と第３レンズ群を一体で移動し、さらに、第４レンズ群を移動し、遠距離状態から近距離状態への合焦に際して第２レンズ群を像面方向に移動させる構成を開示している。しかしながら、広角端状態から望遠端状態への変倍時に、第１レンズ群が固定されているために、広角端状態でのレンズ全長が長く携帯性が悪いという問題がある。さらに、第２レンズ群は変倍と合焦において共に大きく移動するため、第２レンズ群の総移動ストロークが約４７ｍｍと大きく、変倍機構と合焦機構が複雑化あるいは大型化しやすいという問題がある。
The second example of
特許文献２の各実施例は、正屈折力の第１レンズ群と、負屈折力の第２レンズ群と、負屈折力の第３レンズ群と、正屈折力の第４レンズ群と、負屈折力の第５レンズ群から構成され、広角端状態から望遠端状態への変倍に際して、第１、第３、第４、第５の各レンズ群が移動し、第２レンズ群は無限遠撮影状態では変倍の際に固定しており、遠距離状態から近距離状態への合焦に際して像面方向に移動する構成を開示している。しかしながら、変倍あるいは合焦ですべてのレンズ群が移動するために、変倍機構と合焦機構の簡素化が困難であるという問題がある。
Each example of
本発明は、上記問題に鑑みて行われたものであり、焦点距離によるフォーカシング移動量の差が少なく、広角端状態でのレンズ全長の小型化が可能で、変倍機構と合焦機構の簡素化が可能なオートフォーカス一眼レフカメラ用の可変焦点距離レンズを提供することを目的とする。 The present invention has been made in view of the above-described problems, and there is little difference in the amount of focusing movement due to the focal length, and the overall length of the lens in the wide-angle end state can be reduced, and the zooming mechanism and the focusing mechanism are simple. An object of the present invention is to provide a variable focal length lens for an autofocus single-lens reflex camera that can be realized.
上記目的を達成するために、本発明は、物体側から順に、正屈折力の第１レンズ群と、負屈折力の第２レンズ群と、負屈折力の第３レンズ群と、正屈折力の第４レンズ群を有し、広角端状態から望遠端状態への変倍に際し、前記第１レンズ群と前記第２レンズ群の間隔が増大し、前記第３レンズ群と前記第４レンズ群の間隔が減少するよう、前記第１レンズ群は物体方向に移動し、前記第３レンズ群は固定であり、前記第４レンズ群は物体方向に移動し、遠距離状態から近距離状態へのフォーカシングに際して、前記第２レンズ群を像面方向に移動し、以下の条件を満足することを特徴とする可変焦点距離レンズを提供する。
０．２１＜Ｄ２３ｗ／ｆｗ＜０．５
但し、ｆｗは前記広角端状態における前記可変焦点距離レンズの焦点距離、Ｄ２３ｗは前記広角端状態で無限遠合焦状態における前記第２レンズ群と前記第３レンズ群の光軸上での空気間隔である。
In order to achieve the above object, according to the present invention, 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 negative refractive power, and a positive refractive power. The fourth lens group, and the distance between the first lens group and the second lens group increases upon zooming from the wide-angle end state to the telephoto end state, and the third lens group and the fourth lens group The first lens group moves in the object direction, the third lens group is fixed, and the fourth lens group moves in the object direction, so that the distance from the long distance state to the short distance state is reduced. In focusing, a variable focal length lens is provided in which the second lens group is moved in the image plane direction to satisfy the following conditions.
0.21 <D23w / fw <0.5
Where fw is the focal length of the variable focal length lens in the wide-angle end state, and D23w is the air spacing on the optical axis of the second lens group and the third lens group in the infinitely focused state in the wide-angle end state. It is.
また、本発明にかかる可変焦点距離レンズは、以下の条件を満足することが好ましい。
−２．０＜ｆ２／ｆ１＜−０．５
−０．３＜ｆｗ／ｆ１２ｗ＜０．２
０．１４＜ｆｗ／ｆ１２ｔ＜０．４
０．２１＜Ｄ２３ｔ／ｆｗ＜０．６
但し、ｆ１は前記第１レンズ群の焦点距離、ｆ２は前記第２レンズ群の焦点距離、ｆ１２ｗは前記広角端状態で無限遠合焦状態における前記第１レンズ群と前記第２レンズ群の合成焦点距離、ｆ１２ｔは前記望遠端状態で無限遠合焦状態における前記第１レンズ群と前記第２レンズ群の合成焦点距離、Ｄ２３ｔは前記望遠端状態で無限遠合焦状態における前記第２レンズ群と前記第３レンズ群の光軸上での空気間隔である。
The variable focal length lens according to the present invention preferably satisfies the following conditions.
−2.0 <f2 / f1 <−0.5
−0.3 <fw / f12w <0.2
0.14 <fw / f12t <0.4
0.21 <D23t / fw <0.6
Where f1 is the focal length of the first lens group, f2 is the focal length of the second lens group, and f12w is a combination of the first lens group and the second lens group in the infinitely focused state at the wide-angle end state. The focal length, f12t is the combined focal length of the first lens group and the second lens group in the infinite focus state in the telephoto end state, and D23t is the second lens group in the infinite focus state in the telephoto end state. And the air spacing on the optical axis of the third lens group.
また、本発明にかかる可変焦点距離レンズは、無限遠合焦状態において、前記広角端状態から前記望遠端状態への変倍の際に、前記第２レンズ群が固定であり、以下の条件を満足することが好ましい。
Ｍ２ｗ＜−１．５
１．５＜Ｍ２ｔ
但し、Ｍ２ｗは前記広角端状態の無限遠合焦時における前記第２レンズ群の倍率、Ｍ２ｔは前記望遠端状態の無限遠合焦時における前記第２レンズ群の倍率である。
In the variable focal length lens according to the present invention, the second lens group is fixed during zooming from the wide-angle end state to the telephoto end state in an infinitely focused state, and the following conditions are satisfied. It is preferable to satisfy.
M2w <−1.5
1.5 <M2t
However, M2w is the magnification of the second lens group at the time of focusing on infinity in the wide-angle end state, and M2t is the magnification of the second lens group at the time of focusing on infinity in the telephoto end state.
また、本発明にかかる可変焦点距離レンズは、無限遠合焦状態において、前記広角端状態から前記望遠端状態への変倍の際に、前記第２レンズ群と前記第３レンズ群の空気間隔が前記広角端状態でよりも前記望遠端状態で大きくなるように前記第２レンズ群が移動し、以下の条件を満足することが好ましい。
０．０＜（Ｄ２３ｔ−Ｄ２３ｗ）／ｆｗ＜０．１
１．５＜Ｍ２ｔ
但し、Ｍ２ｔは前記望遠端状態の無限遠合焦時における前記第２レンズ群の倍率である。
In the variable focal length lens according to the present invention, the air gap between the second lens group and the third lens group during zooming from the wide-angle end state to the telephoto end state in an infinitely focused state. It is preferable that the second lens group moves so that is larger in the telephoto end state than in the wide-angle end state, and the following condition is satisfied.
0.0 <(D23t−D23w) / fw <0.1
1.5 <M2t
However, M2t is the magnification of the second lens group at the time of focusing at infinity in the telephoto end state.
また、本発明にかかる可変焦点距離レンズは、以下の条件を満足することが好ましい。
１．５＜ｆ１／ｆｗ＜２．０
−３．０＜ｆ２／ｆｗ＜−０．８
−１．０＜ｆ３／ｆｗ＜−０．５
但し、ｆ３は前記第３レンズ群の焦点距離である。
The variable focal length lens according to the present invention preferably satisfies the following conditions.
1.5 <f1 / fw <2.0
−3.0 <f2 / fw <−0.8
−1.0 <f3 / fw <−0.5
Here, f3 is the focal length of the third lens group.
また、本発明にかかる可変焦点距離レンズでは、前記第２レンズ群は、物体側から順に、正レンズと両凹形状の負レンズの接合レンズを有し、前記第３レンズ群は、物体側から順に、両凹形状の負レンズと正レンズの接合レンズを有し、以下の条件を満足することが好ましい。
１０＜ν２ｎ−ν２ｐ
１０＜ν３ｎ−ν３ｐ
但し、ν２ｎは前記第２レンズ群中の前記両凹形状の負レンズのｄ線（λ＝５８７．６ｎｍ）に対するアッベ数、ν２ｐは前記第２レンズ群中の前記正レンズのｄ線（λ＝５８７．６ｎｍ）に対するアッベ数、ν３ｎは前記第３レンズ群中の前記両凹形状の負レンズのｄ線（λ＝５８７．６ｎｍ）に対するアッベ数、ν３ｐは前記第３レンズ群中の前記正レンズのｄ線（λ＝５８７．６ｎｍ）に対するアッベ数である。
In the variable focal length lens according to the present invention, the second lens group includes a cemented lens of a positive lens and a biconcave negative lens in order from the object side, and the third lens group is from the object side. In order, it is preferable to have a cemented lens of a biconcave negative lens and a positive lens, and satisfy the following conditions.
10 <ν2n−ν2p
10 <ν3n−ν3p
Where ν2n is the Abbe number with respect to the d-line (λ = 587.6 nm) of the biconcave negative lens in the second lens group, and ν2p is the d-line (λ = p) of the positive lens in the second lens group. Abbe number to 587.6 nm), ν3n is the Abbe number to the d-line (λ = 587.6 nm) of the biconcave negative lens in the third lens group, and ν3p is the positive lens in the third lens group. Is the Abbe number with respect to the d-line (λ = 587.6 nm).
また、本発明にかかる可変焦点距離レンズは、前記第４レンズ群の像側に正屈折力の第５レンズ群を有し、前記広角端状態から前記望遠端状態への変倍に際して、前記第４レンズ群と前記第５レンズ群の間隔が減少するよう前記第５レンズ群が物体方向に移動することが好ましい。 The variable focal length lens according to the present invention includes a fifth lens unit having a positive refractive power on the image side of the fourth lens unit, and the zoom lens changes the magnification from the wide-angle end state to the telephoto end state. It is preferable that the fifth lens group moves in the object direction so that the distance between the four lens groups and the fifth lens group is reduced.
また、本発明にかかる可変焦点距離レンズは、前記第５レンズ群の像側に負屈折力の第６レンズ群を有し、前記広角端状態から前記望遠端状態への変倍に際して、前記第５レンズ群と前記第６レンズ群の間隔が減少するよう前記第６レンズ群が物体方向に移動することが好ましい。 The variable focal length lens according to the present invention includes a sixth lens unit having a negative refractive power on the image side of the fifth lens unit, and the zoom lens unit performs zooming from the wide-angle end state to the telephoto end state. It is preferable that the sixth lens group moves in the object direction so that the distance between the five lens groups and the sixth lens group is reduced.
また、本発明にかかる可変焦点距離レンズは、以下の条件を満足することが好ましい。
０．６＜Ｋｗ／Ｋｔ＜１．３
但し、Ｋｗは前記広角端状態において、無限遠合焦状態から前記望遠端状態のときの焦点距離の６倍の距離の位置に合焦する際の、前記第２レンズ群の像面方向への移動量、
Ｋｔは前記望遠端状態において、無限遠合焦状態から前記望遠端状態のときの焦点距離の６倍の距離の位置に合焦する際の、前記第２レンズ群の像面方向への移動量である。
The variable focal length lens according to the present invention preferably satisfies the following conditions.
0.6 <Kw / Kt <1.3
However, Kw is in the image plane direction of the second lens group when focusing on a position that is six times the focal length in the telephoto end state from the infinite focus state in the wide-angle end state. Amount of movement,
Kt is the amount of movement in the image plane direction of the second lens group when focusing at a position that is six times the focal length in the telephoto end state from the infinite focus state in the telephoto end state. It is.
本発明によれば、フィルムまたは固体撮像素子を用いるオートフォーカス一眼レフカメラ用に適し、第２レンズ群を移動させてフォーカシングをおこなう可変焦点距離レンズでありながら、焦点距離によるフォーカシング移動量の差が少なく、広角端状態でのレンズ全長の小型化が可能で、変倍機構と合焦機構の簡素化が可能な可変焦点距離レンズを提供することが可能となる。 According to the present invention, although it is a variable focal length lens that is suitable for an autofocus single-lens reflex camera using a film or a solid-state imaging device and performs focusing by moving the second lens group, there is a difference in focusing movement amount depending on the focal length. Therefore, it is possible to provide a variable focal length lens that can reduce the entire length of the lens in the wide-angle end state and can simplify the zooming mechanism and the focusing mechanism.
以下、本発明の実施の形態にかかる可変焦点距離レンズに関し説明する。 Hereinafter, the variable focal length lens according to the embodiment of the present invention will be described.
本発明の実施の形態にかかる可変焦点距離レンズは、物体側から順に、正屈折力の第１レンズ群と、負屈折力の第２レンズ群と、負屈折力の第３レンズ群と、正屈折力の第４レンズ群を有し、広角端状態から望遠端状態への変倍に際し、第１レンズ群と第２レンズ群の間隔が増大し、第３レンズ群と第４レンズ群の間隔が減少するよう、第１レンズ群は物体方向に移動し、第３レンズ群は固定であり、第４レンズ群は物体方向に移動し、遠距離状態から近距離状態へのフォーカシングの際に、第２レンズ群を像面方向に移動させ、以下の条件式（１）を満足する構成である。
（１）０．２１＜Ｄ２３ｗ／ｆｗ＜０．５
但し、ｆｗは広角端状態における可変焦点距離レンズの焦点距離であり、Ｄ２３ｗは広角端状態で無限遠合焦状態における第２レンズ群と第３レンズ群の光軸上での空気間隔である。
A variable focal length lens according to an embodiment of the present invention includes, 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 negative refractive power, The fourth lens unit has a refractive power, and when changing from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group increases, and the distance between the third lens group and the fourth lens group. The first lens group moves in the object direction, the third lens group is fixed, the fourth lens group moves in the object direction, and during focusing from a long distance state to a short distance state, The second lens group is moved in the image plane direction to satisfy the following conditional expression (1).
(1) 0.21 <D23w / fw <0.5
Here, fw is the focal length of the variable focal length lens in the wide-angle end state, and D23w is the air interval on the optical axis of the second lens group and the third lens group in the infinitely far focus state in the wide-angle end state.
このように、第１レンズ群を物体方向に移動する構成とすることにより、広角端状態でのレンズ全長の小型化が可能である。また、第３レンズ群を変倍時および合焦時ともに固定とすることが変倍機構と合焦機構の簡素化に有利である。また、第２レンズ群を像面方向に移動させてフォーカシングすることにより、焦点距離によるフォーカシング移動量の差を少なくすることができ、合焦機構の簡素化に有利である。 As described above, by adopting a configuration in which the first lens group is moved in the object direction, the entire length of the lens in the wide-angle end state can be reduced. In addition, it is advantageous for simplifying the zooming mechanism and the focusing mechanism that the third lens group is fixed during zooming and focusing. Further, by moving the second lens group in the image plane direction for focusing, the difference in the focusing movement amount due to the focal length can be reduced, which is advantageous for simplifying the focusing mechanism.
条件式（１）は、広角端状態における第２レンズ群と第３レンズ群の間隔を規定する。条件式（１）の下限値を越えると、十分なフォーカシング移動量が確保できず、望遠端状態の焦点距離の６倍程度の距離位置までの近距離合焦が困難となる。条件式（１）の上限値を越えると、レンズ全長が大型化し、第１レンズ群および第２レンズ群のレンズ径が大型化するので好ましくない。 Conditional expression (1) defines the distance between the second lens group and the third lens group in the wide-angle end state. If the lower limit value of conditional expression (1) is exceeded, a sufficient amount of focusing movement cannot be secured, and it becomes difficult to focus at a short distance to a distance position that is about six times the focal length in the telephoto end state. Exceeding the upper limit of conditional expression (1) is not preferable because the total lens length increases and the lens diameters of the first lens group and the second lens group increase.
なお、本発明の効果をさらに確実にするために、条件式（１）の下限値を０．２４にすることが望ましい。また、条件式（１）の上限値を０．４５にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (1) to 0.24. Moreover, it is desirable to set the upper limit of conditional expression (1) to 0.45.
また、以下の条件式（２）〜（５）を満足する構成が望ましい。
（２）−２．０＜ｆ２／ｆ１＜−０．５
（３）−０．３＜ｆｗ／ｆ１２ｗ＜０．２
（４）０．１４＜ｆｗ／ｆ１２ｔ＜０．４
（５）０．２１＜Ｄ２３ｔ／ｆｗ＜０．６
但し、ｆ１は第１レンズ群の焦点距離であり、ｆ２は第２レンズ群の焦点距離であり、ｆ１２ｗは広角端状態で無限遠合焦状態における第１レンズ群と第２レンズ群の合成焦点距離であり、ｆ１２ｔは望遠端状態で無限遠合焦状態における第１レンズ群と第２レンズ群の合成焦点距離であり、Ｄ２３ｔは望遠端状態で無限遠合焦状態における第２レンズ群と第３レンズ群の光軸上での空気間隔である。
Further, a configuration that satisfies the following conditional expressions (2) to (5) is desirable.
(2) -2.0 <f2 / f1 <-0.5
(3) -0.3 <fw / f12w <0.2
(4) 0.14 <fw / f12t <0.4
(5) 0.21 <D23t / fw <0.6
Where f1 is the focal length of the first lens group, f2 is the focal length of the second lens group, and f12w is the combined focus of the first lens group and the second lens group in the infinitely focused state at the wide-angle end state. F12t is the combined focal length of the first lens group and the second lens group in the infinite focus state at the telephoto end state, and D23t is the second lens group in the infinite focus state in the telephoto end state. This is the air spacing on the optical axis of the three lens groups.
条件式（２）は、焦点距離によるフォーカシング移動量の差を少なくするための第１レンズ群と第２レンズ群の焦点距離の比を規定する。条件式（２）の上限値と下限値のいずれを越えても、焦点距離によるフォーカシング移動量の差が増大する、あるいは焦点距離によってはフォーカシングできなくなるという問題が生じる。 Conditional expression (2) defines the ratio of the focal lengths of the first lens group and the second lens group for reducing the difference in the amount of focusing movement due to the focal length. If either the upper limit value or the lower limit value of conditional expression (2) is exceeded, there arises a problem that the difference in the amount of focusing movement due to the focal length increases, or the focusing cannot be performed depending on the focal length.
なお、本発明の効果をさらに確実にするために、条件式（２）の下限値を−１．５にすることが望ましい。また、条件式（２）の上限値を−０．６にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (2) to −1.5. In addition, it is desirable to set the upper limit value of conditional expression (2) to −0.6.
条件式（３）は、焦点距離によるフォーカシング移動量の差を少なくするための、広角端状態における第１レンズ群と第２レンズ群の合成焦点距離の適切な範囲を規定する。条件式（３）の上限値と下限値のいずれを越えても、焦点距離によるフォーカシング移動量の差が増大する。 Conditional expression (3) defines an appropriate range of the combined focal length of the first lens group and the second lens group in the wide-angle end state in order to reduce the difference in the amount of focusing movement due to the focal length. Regardless of whether the upper limit value or lower limit value of conditional expression (3) is exceeded, the difference in the amount of focusing movement due to the focal length increases.
なお、本発明の効果をさらに確実にするために、条件式（３）の下限値を−０．２５にすることが望ましい。また、条件式（３）の上限値を０．１５にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit value of conditional expression (3) to −0.25. Moreover, it is desirable to set the upper limit of conditional expression (3) to 0.15.
条件式（４）は、焦点距離によるフォーカシング移動量の差を少なくするための、望遠端状態における第１レンズ群と第２レンズ群の合成焦点距離の適切な範囲を規定する。条件式（４）の上限値と下限値のいずれを越えても、焦点距離によるフォーカシング移動量の差が増大する。 Conditional expression (4) defines an appropriate range of the combined focal length of the first lens group and the second lens group in the telephoto end state in order to reduce the difference in focusing movement amount due to the focal length. Regardless of whether the upper limit value or lower limit value of conditional expression (4) is exceeded, the difference in the amount of focusing movement due to the focal length increases.
なお、本発明の効果をさらに確実にするために、条件式（４）の下限値を０．１６にすることが望ましい。また、条件式（４）の上限値を０．３５にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (4) to 0.16. Moreover, it is desirable to set the upper limit of conditional expression (4) to 0.35.
条件式（５）は、望遠端状態における第２レンズ群と第３レンズ群の間隔を規定する。条件式（５）の下限値を越えると、十分なフォーカシング移動量が確保できず、望遠端状態の焦点距離の６倍程度の距離位置までの近距離合焦が困難となる。条件式（５）の上限値を越えると、レンズ全長が大型化し、第１レンズ群および第２レンズ群のレンズ径が大型化するため好ましくない。 Conditional expression (5) defines the distance between the second lens group and the third lens group in the telephoto end state. If the lower limit value of conditional expression (5) is exceeded, a sufficient amount of focusing movement cannot be secured, and it becomes difficult to focus at a short distance up to a distance position about six times the focal length in the telephoto end state. Exceeding the upper limit value of conditional expression (5) is not preferable because the total lens length increases and the lens diameters of the first lens group and the second lens group increase.
なお、本発明の効果をさらに確実にするために、条件式（５）の下限値を０．２４にすることが望ましい。また、条件式（５）の上限値を０．５にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (5) to 0.24. Moreover, it is desirable to set the upper limit of conditional expression (5) to 0.5.
また、無限遠合焦状態において、広角端状態から望遠端状態への変倍の際に、第２レンズ群が固定であって、第２レンズ群と第３レンズ群の間隔が一定の構成が望ましい。このような構成は第２レンズ群の移動をフォーカシング用途に特化でき、変倍機構や合焦機構の簡素化に有利である。 In the infinite focus state, the second lens group is fixed and the distance between the second lens group and the third lens group is constant when zooming from the wide-angle end state to the telephoto end state. desirable. Such a configuration can specialize the movement of the second lens group for focusing purposes, and is advantageous for simplifying the zooming mechanism and the focusing mechanism.
また、以下の条件式（６）〜（７）を満足する構成が望ましい。
（６） Ｍ２ｗ＜−１．５
（７） １．５＜Ｍ２ｔ
但し、Ｍ２ｗは広角端状態の無限遠合焦時における第２レンズ群の倍率であり、Ｍ２ｔは望遠端状態の無限遠合焦時における第２レンズ群の倍率である。
In addition, a configuration that satisfies the following conditional expressions (6) to (7) is desirable.
(6) M2w <−1.5
(7) 1.5 <M2t
However, M2w is the magnification of the second lens group when focusing at infinity in the wide-angle end state, and M2t is the magnification of the second lens group when focusing at infinity in the telephoto end state.
条件式（６）は広角端状態の無限遠合焦状態における第２レンズ群の倍率を規定する。条件式（６）の上限値を越えると、広角端状態における第２レンズ群のフォーカシング移動量が大きくなり好ましくない。 Conditional expression (6) defines the magnification of the second lens group in the infinitely focused state at the wide-angle end state. Exceeding the upper limit of conditional expression (6) is not preferable because the amount of focusing movement of the second lens unit in the wide-angle end state increases.
なお、本発明の効果をさらに確実にするために、条件式（６）の上限値を−２．０にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the upper limit of conditional expression (6) to −2.0.
条件式（７）は望遠端状態の無限遠合焦状態における第２レンズ群の倍率を規定する。条件式（７）の下限値を越えると、望遠端状態における第２レンズ群のフォーカシング移動量が大きくなり好ましくない。 Conditional expression (7) defines the magnification of the second lens group in the infinitely focused state at the telephoto end state. Exceeding the lower limit of conditional expression (7) is not preferable because the amount of focusing movement of the second lens unit in the telephoto end state increases.
なお、本発明の効果をさらに確実にするために、条件式（７）の下限値を２．０にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (7) to 2.0.
また、無限遠合焦状態において、広角端状態から望遠端状態への変倍の際に、第２レンズと第３レンズの空気間隔が広角端状態でよりも望遠端状態で大きくなるように第２レンズ群が移動する構成が望ましい。 Further, in the infinite focus state, when zooming from the wide-angle end state to the telephoto end state, the second lens and the third lens have a larger air gap in the telephoto end state than in the wide-angle end state. A configuration in which the two lens groups move is desirable.
変倍の際に第１レンズ群が望遠端状態で最も物体に近くなるためにフォーカシング移動量が望遠端状態で大きくなりがちである。このような構成にすれば、第２レンズ群と第３レンズ群の間隔を広角端状態よりも望遠端状態で大きく確保することができ、広角端状態と望遠端状態で必要な移動空間である第２レンズ群と第３レンズ群の間隔を小さくすることができる。 During zooming, the first lens group is closest to the object in the telephoto end state, so that the focusing movement amount tends to be large in the telephoto end state. With such a configuration, the distance between the second lens group and the third lens group can be secured larger in the telephoto end state than in the wide-angle end state, and is a necessary moving space in the wide-angle end state and the telephoto end state. The interval between the second lens group and the third lens group can be reduced.
また、以下の条件式（８）〜（９）を満足する構成が望ましい。
（８）０ ＜（Ｄ２３ｔ−Ｄ２３ｗ）／ｆｗ＜０．１
（９）１．５＜Ｍ２ｔ
但し、Ｍ２ｔは望遠端状態の無限遠合焦時における第２レンズ群の倍率である。
In addition, a configuration that satisfies the following conditional expressions (8) to (9) is desirable.
(8) 0 <(D23t−D23w) / fw <0.1
(9) 1.5 <M2t
However, M2t is the magnification of the second lens group at the time of focusing at infinity in the telephoto end state.
条件式（８）は広角端状態と望遠端状態での第２レンズ群と第３レンズ群の空気間隔の差を規定する。条件式（８）の上限値を越えると望遠端状態でのレンズ全長が大型化する。条件式（８）の下限値を越えると広角端状態でのレンズ全長が大型化する。 Conditional expression (8) defines the difference in air spacing between the second lens group and the third lens group in the wide-angle end state and the telephoto end state. If the upper limit of conditional expression (8) is exceeded, the total lens length in the telephoto end state increases. If the lower limit value of conditional expression (8) is exceeded, the total lens length in the wide-angle end state increases.
なお、本発明の効果をさらに確実にするために、条件式（８）の下限値を０．０２にすることが望ましい。また、条件式（８）の上限値を０．０８にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (8) to 0.02. Moreover, it is desirable to set the upper limit of conditional expression (8) to 0.08.
条件式（９）は望遠端状態の無限遠合焦状態における第２レンズ群の倍率を規定する。条件式（９）の下限値を越えると、望遠端状態における第２レンズ群のフォーカシング移動量が大きくなり好ましくない。 Conditional expression (9) defines the magnification of the second lens group in the infinitely focused state at the telephoto end state. Exceeding the lower limit of conditional expression (9) is not preferable because the amount of focusing movement of the second lens unit in the telephoto end state increases.
なお、本発明の効果をさらに確実にするために、条件式（９）の下限値を１．６にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (9) to 1.6.
また、以下の条件式（１０）〜（１２）を満足する構成が望ましい。
（１０）１．５＜ｆ１／ｆｗ＜２．０
（１１）−３．０＜ｆ２／ｆｗ＜−０．８
（１２）−１．０＜ｆ３／ｆｗ＜−０．５
但し、ｆ３は第３レンズ群の焦点距離である。
In addition, a configuration that satisfies the following conditional expressions (10) to (12) is desirable.
(10) 1.5 <f1 / fw <2.0
(11) -3.0 <f2 / fw <-0.8
(12) -1.0 <f3 / fw <-0.5
Here, f3 is the focal length of the third lens group.
条件式（１０）は第１レンズ群の焦点距離の適切な範囲を規定する。条件式（１０）の上限値を越えると第１レンズ群の焦点距離が長くなり、レンズ全長の大型化を招く。条件式（１０）の下限値を越えると第１レンズ群の焦点距離が短くなり良好な結像性能の確保が困難となる。 Conditional expression (10) defines an appropriate range of the focal length of the first lens group. If the upper limit value of conditional expression (10) is exceeded, the focal length of the first lens group becomes long, leading to an increase in the total lens length. If the lower limit of conditional expression (10) is exceeded, the focal length of the first lens group will be shortened, making it difficult to ensure good imaging performance.
なお、本発明の効果をさらに確実にするために、条件式（１０）の下限値を１．６０にすることが望ましい。また、条件式（１０）の上限値を１．９０にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit value of conditional expression (10) to 1.60. Moreover, it is desirable to set the upper limit of conditional expression (10) to 1.90.
条件式（１１）は第２レンズ群の焦点距離の適切な範囲を規定する。条件式（１１）の上限値と下限値のいずれを越えても、焦点距離による第２レンズ群のフォーカシング移動量の差が大きくなり好ましくない。 Conditional expression (11) defines an appropriate range of the focal length of the second lens group. If either the upper limit value or the lower limit value of conditional expression (11) is exceeded, the difference in the amount of focusing movement of the second lens group due to the focal length becomes unfavorable.
なお、本発明の効果をさらに確実にするために、条件式（１１）の下限値を−２．６０にすることが望ましい。また、条件式（１１）の上限値を−１．００にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (11) to −2.60. In addition, it is desirable to set the upper limit of conditional expression (11) to -1.00.
条件式（１２）は第３レンズ群の焦点距離の適切な範囲を規定する。条件式（１２）の上限値を越えると、第３レンズ群の焦点距離が短くなり良好な結像性能の確保が困難となる。条件式（１２）の下限値を越えると、第３レンズ群の焦点距離が長くなり、レンズ全長の大型化を招く。 Conditional expression (12) defines an appropriate range of the focal length of the third lens group. If the upper limit value of conditional expression (12) is exceeded, the focal length of the third lens group will be shortened, making it difficult to ensure good imaging performance. If the lower limit value of conditional expression (12) is exceeded, the focal length of the third lens group will be increased, leading to an increase in the total lens length.
なお、本発明の効果をさらに確実にするために、条件式（１２）の下限値を−０．８５にすることが望ましい。また、条件式（１２）の上限値を−０．６０にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (12) to −0.85. In addition, it is desirable to set the upper limit of conditional expression (12) to −0.60.
また、第２レンズ群は、物体側から順に、正レンズと両凹形状の負レンズの接合レンズを有し、第３レンズ群は、物体側から順に、両凹形状の負レンズと正レンズの接合レンズを有する構成が望ましい。 The second lens group includes a cemented lens of a positive lens and a biconcave negative lens in order from the object side, and the third lens group includes a biconcave negative lens and a positive lens in order from the object side. A configuration having a cemented lens is desirable.
このような構成は、簡素で少ないレンズ構成枚数のもとで良好な結像性能を得ることができる。 Such a configuration is simple and can provide good imaging performance with a small number of lens components.
また、以下の条件式（１３）〜（１４）を満足する構成が望ましい。
（１３）１０＜ν２ｎ−ν２ｐ
（１４）１０＜ν３ｎ−ν３ｐ
但し、ν２ｎは第２レンズ群中の両凹形状の負レンズのｄ線（λ＝５８７．６ｎｍ）に対するアッベ数であり、ν２ｐは第２レンズ群中の正レンズのｄ線（λ＝５８７．６ｎｍ）に対するアッベ数であり、ν３ｎは第３レンズ群中の両凹形状の負レンズのｄ線（λ＝５８７．６ｎｍ）に対するアッベ数であり、ν３ｐは第３レンズ群中の正レンズのｄ線（λ＝５８７．６ｎｍ）に対するアッベ数である。
In addition, a configuration that satisfies the following conditional expressions (13) to (14) is desirable.
(13) 10 <ν2n−ν2p
(14) 10 <ν3n−ν3p
Where ν2n is the Abbe number with respect to the d-line (λ = 587.6 nm) of the biconcave negative lens in the second lens group, and ν2p is the d-line (λ = 587.n) of the positive lens in the second lens group. 6 nm), ν3n is the Abbe number with respect to the d-line (λ = 587.6 nm) of the biconcave negative lens in the third lens group, and ν3p is the d of the positive lens in the third lens group. Abbe number for the line (λ = 587.6 nm).
条件式（１３）は第２レンズ群内の負レンズと正レンズのアッベ数の差を規定する。条件式（１３）の下限値を越えると変倍と合焦のいずれにおいても色収差の変動が大きくなり好ましくない。 Conditional expression (13) defines the difference in Abbe number between the negative lens and the positive lens in the second lens group. Exceeding the lower limit value of conditional expression (13) is not preferable because variation in chromatic aberration increases both in zooming and in focusing.
なお、本発明の効果をさらに確実にするために、条件式（１３）の下限値を１２にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (13) to 12.
条件式（１４）は第３レンズ群内の負レンズと正レンズのアッベ数の差を規定する。条件式（１４）の下限値を越えると変倍と合焦のいずれにおいても色収差の変動が大きくなり好ましくない。 Conditional expression (14) defines the Abbe number difference between the negative lens and the positive lens in the third lens group. Exceeding the lower limit value of conditional expression (14) is not preferable because variation in chromatic aberration increases both in zooming and in focusing.
なお、本発明の効果をさらに確実にするために、条件式（１４）の下限値を１２にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (14) to 12.
また、第４レンズ群の像側に正屈折力の第５レンズ群を有し、広角端状態から望遠端状態への変倍に際して、第４レンズ群と第５レンズ群の間隔が減少するよう第５レンズ群が物体方向に移動する構成が望ましい。 Further, the fifth lens group having a positive refractive power is provided on the image side of the fourth lens group so that the distance between the fourth lens group and the fifth lens group is reduced upon zooming from the wide-angle end state to the telephoto end state. A configuration in which the fifth lens group moves in the object direction is desirable.
このような構成とすることで、広角端状態及び望遠端状態のみならず中間焦点距離状態でも良好な収差補正が可能となる。 With such a configuration, it is possible to correct aberrations favorably not only in the wide-angle end state and the telephoto end state but also in the intermediate focal length state.
また、第５レンズ群の像側に負屈折力の第６レンズ群を有し、広角端状態から望遠端状態への変倍に際して、第５レンズ群と第６レンズ群の間隔が減少するよう第６レンズ群が物体方向に移動する構成が望ましい。 Further, the sixth lens group having negative refractive power is provided on the image side of the fifth lens group so that the distance between the fifth lens group and the sixth lens group is reduced upon zooming from the wide-angle end state to the telephoto end state. A configuration in which the sixth lens group moves in the object direction is desirable.
このような構成とすることで、焦点距離の可変範囲をより広くすることが可能となる。 With such a configuration, the variable range of the focal length can be made wider.
また、以下の条件式（１５）を満足する構成が望ましい。
（１５）０．６＜Ｋｗ／Ｋｔ＜１．３
但し、Ｋｗは広角端状態において、無限遠合焦状態から望遠端状態のときの焦点距離の６倍の距離の位置に合焦する際の、第２レンズ群の像面方向への移動量、Ｋｔは望遠端状態において、無限遠合焦状態から望遠端状態のときの焦点距離の６倍の距離の位置に合焦する際の、第２レンズ群の像面方向への移動量である。
In addition, a configuration that satisfies the following conditional expression (15) is desirable.
(15) 0.6 <Kw / Kt <1.3
However, Kw is the amount of movement in the image plane direction of the second lens group when focusing at a position that is six times the focal length in the telephoto end state from the infinite focus state in the wide-angle end state, Kt is the amount of movement of the second lens group in the image plane direction when focusing on a position that is six times the focal length of the telephoto end state to the telephoto end state in the telephoto end state.
条件式（１５）の上限値と下限値のいずれを越えても、焦点距離の違いによるフォーカシング移動量の差が大きくなり好ましくない。 If either the upper limit value or the lower limit value of the conditional expression (15) is exceeded, the difference in the focusing movement amount due to the difference in the focal length becomes unfavorable.
なお、本発明の効果をさらに確実にするために、条件式（１５）の下限値を０．６５にすることが望ましい。また、条件式（１５）の上限値を１．２０にすることが望ましい。 In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (15) to 0.65. In addition, it is desirable to set the upper limit of conditional expression (15) to 1.20.
以下、本発明の実施の形態にかかる各実施例について図面を参照しつつ説明する。 Embodiments according to embodiments of the present invention will be described below with reference to the drawings.
（第１実施例）
図１は本発明の第１実施例にかかる可変焦点距離レンズのレンズ構成図である。
(First embodiment)
FIG. 1 is a lens configuration diagram of a variable focal length lens according to a first embodiment of the present invention.
図１において、可変焦点距離レンズは、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、負屈折力の第３レンズ群Ｇ３と、正屈折力の第４レンズ群Ｇ４と、開口絞りＳと、正屈折力の第５レンズ群Ｇ５と、負屈折力の第６レンズ群Ｇ６から構成され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第１レンズ群Ｇ１と第２レンズ群Ｇ２の空気間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の空気間隔は一定で、第３レンズ群Ｇ３と第４レンズ群Ｇ４の空気間隔が減少し、第４レンズ群Ｇ４と第５レンズ群Ｇ５の空気間隔が減少し、第５レンズ群Ｇ５と第６レンズ群Ｇ６の空気間隔が減少するように、第１レンズ群Ｇ１と第４レンズ群Ｇ２と第５レンズ群Ｇ５と第６レンズ群Ｇ６が物体方向に移動し、第２レンズ群Ｇ２と第３レンズ群Ｇ３は固定であり、遠距離状態から近距離状態へのフォーカシングは、第２レンズ群Ｇ２のみを像面Ｉ方向に移動させる構成である。 In FIG. 1, the variable focal length lens includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a negative refractive power, and a positive refraction. A fourth lens group G4 having a power, an aperture stop S, a fifth lens group G5 having a positive refractive power, and a sixth lens group G6 having a negative refractive power, and from a wide-angle end state (W) to a telephoto end state (T ), The air gap between the first lens group G1 and the second lens group G2 increases, the air gap between the second lens group G2 and the third lens group G3 is constant, and the third lens group G3 and the second lens group G3 The air gap between the fourth lens group G4 is reduced, the air gap between the fourth lens group G4 and the fifth lens group G5 is reduced, and the air gap between the fifth lens group G5 and the sixth lens group G6 is reduced. The first lens group G1, the fourth lens group G2, the fifth lens group G5, and the sixth lens group G6 are in the object direction. Moving a second lens group G2 and the third lens group G3 is fixed, the focusing from infinity to a close, a structure for moving only the second lens group G2 to the image plane I direction.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズと両凸形状の正レンズとの接合レンズと、物体側に凸面を向けた正メニスカスレンズからなる。 The first lens group G1 includes a cemented lens of a negative meniscus lens having a convex surface directed toward the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface directed toward the object side.
第２レンズ群Ｇ２は、物体側に凹面を向けた正メニスカスレンズＬ２１と両凹形状の負レンズＬ２２との接合レンズからなる。 The second lens group G2 includes a cemented lens including a positive meniscus lens L21 having a concave surface directed toward the object side and a biconcave negative lens L22.
第３レンズ群Ｇ３は、両凹形状の負レンズＬ３１と物体側に凸面を向けた正メニスカスレンズＬ３２の接合レンズからなる。 The third lens group G3 includes a cemented lens including a biconcave negative lens L31 and a positive meniscus lens L32 having a convex surface directed toward the object side.
第４レンズ群Ｇ４は、両凸形状の正レンズと、両凸正レンズと両凹負レンズとの接合レンズからなる。 The fourth lens group G4 includes a biconvex positive lens and a cemented lens of a biconvex positive lens and a biconcave negative lens.
第５レンズ群Ｇ５は、物体側に凸面を向けた負メニスカスレンズと、両凸形状の正レンズと物体側に凹面を向けた負メニスカスレンズとの接合レンズと、物体側に凸面を向けた正メニスカスレンズからなる。 The fifth lens group G5 includes a negative meniscus lens having a convex surface directed toward the object side, a cemented lens of a biconvex positive lens and a negative meniscus lens having a concave surface directed toward the object side, and a positive lens having a convex surface directed toward the object side. It consists of a meniscus lens.
第６レンズ群Ｇ６は、物体側に凸面を向けた負メニスカスレンズと、物体側に凹面を向けた正メニスカスレンズと物体側に凹面を向けた負メニスカスレンズの接合レンズからなる。 The sixth lens group G6 includes a negative meniscus lens having a convex surface directed toward the object side, a positive meniscus lens having a concave surface directed toward the object side, and a cemented lens having a negative meniscus lens directed toward the object side.
開口絞りＳは、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第４レンズ群Ｇ４と一緒に移動する。 The aperture stop S moves together with the fourth lens group G4 when zooming from the wide-angle end state (W) to the telephoto end state (T).
以下の表１に、第１実施例の諸元の値を掲げる。［全体諸元］中、ｆは焦点距離、ＦＮＯはＦナンバー、２ωは画角をそれぞれ表す。［レンズ諸元］中、第１カラムは物体側からのレンズ面の番号、第２カラムｒはレンズ面の曲率半径、第３カラムｄはレンズ面間隔、第４カラムνはｄ線（λ＝５８７．６ｎｍ）に対するアッベ数、第５カラムｎはｄ線（λ=587.6nm）に対する屈折率をそれぞれ表す。なお、第２カラムｒにおいて「∞」は平面を示し、第５カラムｎにおいて空気の屈折率１．００００００は記載を省略している。［可変間隔データー］には、焦点距離ｆまたは撮影倍率Ｍと、可変間隔の値を示す。Ｄ０は物体から第１レンズ面までの距離を示し、Ｒは物体から像面までの距離を示し、B.f.はバックフォーカスを示す。[条件式対応値]は、各条件式の値を示す。 Table 1 below lists values of specifications of the first embodiment. In [Overall specifications], f represents a focal length, FNO represents an F number, and 2ω represents an angle of view. In [lens specifications], the first column is the lens surface number from the object side, the second column r is the radius of curvature of the lens surface, the third column d is the lens surface interval, and the fourth column ν is the d line (λ = The Abbe number for 587.6 nm) and the fifth column n represent the refractive index for the d-line (λ = 587.6 nm), respectively. In the second column r, “∞” indicates a plane, and the refractive index of air of 1.000000 is omitted in the fifth column n. [Variable interval data] indicates the focal length f or the photographing magnification M and the value of the variable interval. D0 represents the distance from the object to the first lens surface, R represents the distance from the object to the image plane, and B.f. represents the back focus. [Conditional Expression Corresponding Value] indicates the value of each conditional expression.
なお、望遠端状態（Ｔ）の焦点距離の６倍の撮影距離（Ｒ＝１７９９．１４９）に対する第２レンズ群Ｇ２のフォーカシング移動量は、広角端状態（Ｗ）において１１．４０２、中間焦点距離状態において１０．１５４、望遠端状態（Ｔ）において１１．４５５である。 The focusing movement amount of the second lens group G2 with respect to the photographing distance (R = 1799.149) that is six times the focal length in the telephoto end state (T) is 11.402 in the wide-angle end state (W), and the intermediate focal length. It is 10.154 in the state, and 11.455 in the telephoto end state (T).
なお、以下の全ての諸元の値において、掲載されている焦点距離ｆ、曲率半径ｒ、レンズ面間隔ｄその他の長さ等は、特記の無い場合一般に「ｍｍ」が使われるが、光学系は比例拡大または比例縮小し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。また、単位は「ｍｍ」に限定されることなく他の適当な単位を用いることもできる。さらに、これらの符号は、以降の他の実施例においても同様であり説明を省略する。 In all of the following specifications, “mm” is generally used as the focal length f, radius of curvature r, lens surface interval d, and other lengths unless otherwise specified. Since the same optical performance can be obtained even if proportional expansion or proportional reduction is performed, the present invention is not limited to this. Further, the unit is not limited to “mm”, and other appropriate units may be used. Furthermore, these symbols are the same in the other embodiments below, and the description thereof is omitted.
（表１）
［全体諸元］
ｆ＝７０．０９８〜１３４．８７２〜２９９．８５８
ＦＮＯ＝４．４２〜５．１１〜５．７８
２ω＝３４．９９〜１７．８８〜８．０２°
［レンズ諸元］
r d ν n
1 102.2801 1.8000 29.23 1.721510
2 67.1273 7.8689 81.61 1.497000
3 -597.8300 0.5000
4 102.1439 3.9070 81.61 1.497000
5 432.1781 (d 5)
6 -371.2681 3.4025 23.78 1.846660
7 -58.4994 1.4000 46.58 1.804000
8 75.8262 (d 8)
9 -70.0834 1.4000 37.95 1.723420
10 21.1895 3.0003 23.78 1.846660
11 55.6942 (d11)
12 57.7078 2.6579 33.80 1.647690
13 -126.0891 0.2000
14 53.5539 4.1631 81.61 1.497000
15 -33.1059 1.4000 34.96 1.801000
16 2183.6061 1.5000
17 ∞ (d17) 開口絞りＳ
18 82.9391 1.4000 23.78 1.846660
19 41.7975 0.9141
20 77.2691 4.2426 52.42 1.517420
21 -27.8099 1.4000 23.78 1.846660
22 -39.1356 0.2000
23 36.4135 2.7322 46.58 1.804000
24 352.8763 (d24)
25 76.3711 1.4000 46.58 1.804000
26 27.8129 18.7984
27 -41.2319 3.0150 23.78 1.846660
28 -21.4237 1.4000 46.58 1.804000
29 -85.6646 (B.f.)
［可変間隔データー］
（無限遠合焦状態）
広角端状態 中間焦点距離状態 望遠端状態
ｆ 70.09825 134.89611 299.78050
Ｄ０ ∞ ∞ ∞
d 5 1.73294 31.55585 56.77347
d 8 18.71986 18.71986 18.71986
d11 17.27471 11.37642 2.50000
d17 22.82505 16.31492 10.29521
d24 8.74544 6.61380 1.00000
B.f. 39.49822 54.03828 74.54828
Ｒ ∞ ∞ ∞
（最短撮影距離合焦状態）
広角端状態 中間焦点距離状態 望遠端状態
Ｍ -0.06196 -0.11497 -0.24704
Ｄ０ 1322.5018 1292.6789 1267.4612
d 5 15.94550 44.29899 71.23230
d 8 4.50730 5.97672 4.26103
d11 17.27471 11.37642 2.50000
d17 22.82505 16.31492 10.29521
d24 8.74544 6.61380 1.00000
B.f. 39.49822 54.03828 74.54828
Ｒ 1500.0000 1500.0000 1500.0000
[条件式対応値]
（１） 0.267
（２） -0.670
（３） -0.210
（４） 0.176
（５） 0.267
（６） -2.736
（７） 3.263
（８） −
（９） −
（１０） 1.744
（１１） -1.168
（１２） -0.717
（１３） 22.80
（１４） 14.17
（１５） 0.995
(Table 1)
[Overall specifications]
f = 70.998 to 134.872 to 299.858
FNO = 4.42-5.11-11.78
2ω = 34.99-17.88-8.02 °
[Lens specifications]
rd ν n
1 102.2801 1.8000 29.23 1.721510
2 67.1273 7.8689 81.61 1.497000
3 -597.8300 0.5000
4 102.1439 3.9070 81.61 1.497000
5 432.1781 (d 5)
6 -371.2681 3.4025 23.78 1.846660
7 -58.4994 1.4000 46.58 1.804000
8 75.8262 (d 8)
9 -70.0834 1.4000 37.95 1.723420
10 21.1895 3.0003 23.78 1.846660
11 55.6942 (d11)
12 57.7078 2.6579 33.80 1.647690
13 -126.0891 0.2000
14 53.5539 4.1631 81.61 1.497000
15 -33.1059 1.4000 34.96 1.801000
16 2183.6061 1.5000
17 ∞ (d17) Aperture stop S
18 82.9391 1.4000 23.78 1.846660
19 41.7975 0.9141
20 77.2691 4.2426 52.42 1.517420
21 -27.8099 1.4000 23.78 1.846660
22 -39.1356 0.2000
23 36.4135 2.7322 46.58 1.804000
24 352.8763 (d24)
25 76.3711 1.4000 46.58 1.804000
26 27.8129 18.7984
27 -41.2319 3.0150 23.78 1.846660
28 -21.4237 1.4000 46.58 1.804000
29 -85.6646 (Bf)
[Variable interval data]
(Infinite focus state)
Wide-angle end state Intermediate focal length state Telephoto end state f 70.09825 134.89611 299.78050
D0 ∞ ∞ ∞
d 8 18.71986 18.71986 18.71986
d11 17.27471 11.37642 2.50000
d17 22.82505 16.31492 10.29521
d24 8.74544 6.61380 1.00000
Bf 39.49822 54.03828 74.54828
R ∞ ∞ ∞
(Shortest focusing distance)
Wide-angle end state Intermediate focal length state Telephoto end state M -0.06196 -0.11497 -0.24704
D0 1322.5018 1292.6789 1267.4612
d 8 4.50730 5.97672 4.26103
d11 17.27471 11.37642 2.50000
d17 22.82505 16.31492 10.29521
d24 8.74544 6.61380 1.00000
Bf 39.49822 54.03828 74.54828
R 1500.0000 1500.0000 1500.0000
[Values for conditional expressions]
(1) 0.267
(2) -0.670
(3) -0.210
(4) 0.176
(5) 0.267
(6) -2.736
(7) 3.263
(8)-
(9)-
(10) 1.744
(11) -1.168
(12) -0.717
(13) 22.80
(14) 14.17
(15) 0.995
図２は第１実施例の広角端状態での諸収差図を示し、（ａ）は無限遠合焦状態の収差図を、（ｂ）は最短撮影距離（１５００ｍｍ）合焦状態の収差図をそれぞれ示す。図３は第１実施例の中間焦点距離状態での諸収差図を示し、（ａ）は無限遠合焦状態の収差図を、（ｂ）は最短撮影距離合焦状態の収差図をそれぞれ示す。図４は第１実施例の望遠端状態での諸収差図を示し、（ａ）は無限遠合焦状態の収差図を、（ｂ）は最短撮影距離合焦状態の収差図をそれぞれ示す。 2A and 2B are graphs showing various aberrations in the wide-angle end state of the first embodiment. FIG. 2A is an aberration diagram in the infinite focus state, and FIG. 2B is an aberration diagram in the shortest shooting distance (1500 mm). Each is shown. FIG. 3 shows various aberration diagrams in the intermediate focal length state of the first embodiment, (a) shows the aberration diagram in the infinite focus state, and (b) shows the aberration diagram in the shortest shooting distance focus state. . 4A and 4B show various aberration diagrams in the telephoto end state of the first embodiment. FIG. 4A shows an aberration diagram in the infinite focus state, and FIG. 4B shows an aberration diagram in the shortest shooting distance focus state.
各収差図において、ＦＮＯはＦナンバー、ＮＡは開口数、Ｙは像高、ｄはｄ線（λ=587.6nm）及びｇはｇ線（λ=435.6nm）をそれぞれ示す。非点収差図において、実線はサジタル像面を、破線はメリジオナル像面をそれぞれ示す。なお、これらの符号は、以降の他の実施例においても同様であり説明を省略する。 In each aberration diagram, FNO is the F number, NA is the numerical aperture, Y is the image height, d is the d-line (λ = 587.6 nm), and g is the g-line (λ = 435.6 nm). In the astigmatism diagram, the solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane. Note that these symbols are the same in the other embodiments, and the description thereof is omitted.
各収差図から、本第１実施例は諸収差が良好に補正され、優れた結像性能を有していることが明らかである。 From each aberration diagram, it is apparent that the first embodiment has excellent imaging performance with various aberrations corrected well.
（第２実施例）
図５は本発明の第２実施例にかかる可変焦点距離レンズのレンズ構成図である。
(Second embodiment)
FIG. 5 is a lens configuration diagram of a variable focal length lens according to the second embodiment of the present invention.
図５において、可変焦点距離レンズは、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、負屈折力の第３レンズ群Ｇ３と、正屈折力の第４レンズ群Ｇ４と、開口絞りＳと、正屈折力の第５レンズ群Ｇ５と、負屈折力の第６レンズ群Ｇ６から構成され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第１レンズ群Ｇ１と第２レンズ群Ｇ２の空気間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の空気間隔が増大し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の空気間隔が減少し、第４レンズ群Ｇ４と第５レンズ群Ｇ５の空気間隔が減少し、第５レンズ群Ｇ５と第６レンズ群Ｇ６の空気間隔が減少するように、第１レンズ群Ｇ１と第２レンズ群Ｇ２と第４レンズ群Ｇ４と第５レンズ群Ｇ５と第６レンズ群Ｇ６が物体方向に移動し、第３レンズ群Ｇ３は固定であり、遠距離状態から近距離状態へのフォーカシングは、第２レンズ群Ｇ２のみを像面Ｉ方向に移動させる構成である。 In FIG. 5, the variable focal length lens includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a negative refractive power, and a positive refraction. A fourth lens group G4 having a power, an aperture stop S, a fifth lens group G5 having a positive refractive power, and a sixth lens group G6 having a negative refractive power, and from a wide-angle end state (W) to a telephoto end state (T ), The air gap between the first lens group G1 and the second lens group G2 increases, the air gap between the second lens group G2 and the third lens group G3 increases, and the third lens group G3 and the second lens group G3 The air gap between the fourth lens group G4 is reduced, the air gap between the fourth lens group G4 and the fifth lens group G5 is reduced, and the air gap between the fifth lens group G5 and the sixth lens group G6 is reduced. 1 lens group G1, 2nd lens group G2, 4th lens group G4, 5th lens group G5, and 6th lens Group G6 moves toward the object, a third lens group G3 is fixed, the focusing from infinity to a close, a structure for moving only the second lens group G2 to the image plane I direction.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズと両凸形状の正レンズとの接合レンズと、物体側に凸面を向けた正メニスカスレンズからなる。 The first lens group G1 includes a cemented lens of a negative meniscus lens having a convex surface directed toward the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface directed toward the object side.
第２レンズ群Ｇ２は、物体側に凹面を向けた正メニスカスレンズＬ２１と両凹形状の負レンズＬ２２との接合レンズからなる。 The second lens group G2 includes a cemented lens including a positive meniscus lens L21 having a concave surface directed toward the object side and a biconcave negative lens L22.
第３レンズ群Ｇ３は、両凹形状の負レンズＬ３１と物体側に凸面を向けた正メニスカスレンズＬ３２の接合レンズからなる。 The third lens group G3 includes a cemented lens including a biconcave negative lens L31 and a positive meniscus lens L32 having a convex surface directed toward the object side.
第４レンズ群Ｇ４は、両凸形状の正レンズと、両凸形状の正レンズと両凹形状の負レンズとの接合レンズからなる。 The fourth lens group G4 includes a biconvex positive lens and a cemented lens of a biconvex positive lens and a biconcave negative lens.
第５レンズ群Ｇ５は、物体側に凸面を向けた負メニスカスレンズと、両凸形状の正レンズと物体側に凹面を向けた負メニスカスレンズとの接合レンズと、物体側に凸面を向けた正メニスカスレンズからなる。 The fifth lens group G5 includes a negative meniscus lens having a convex surface directed toward the object side, a cemented lens of a biconvex positive lens and a negative meniscus lens having a concave surface directed toward the object side, and a positive lens having a convex surface directed toward the object side. It consists of a meniscus lens.
第６レンズ群Ｇ６は、物体側に凸面を向けた負メニスカスレンズと、物体側に凹面を向けた正メニスカスレンズと物体側に凹面を向けた負メニスカスレンズの接合レンズからなる。 The sixth lens group G6 includes a negative meniscus lens having a convex surface directed toward the object side, a positive meniscus lens having a concave surface directed toward the object side, and a cemented lens having a negative meniscus lens directed toward the object side.
開口絞りＳは、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第４レンズ群Ｇ４と一緒に移動する。 The aperture stop S moves together with the fourth lens group G4 when zooming from the wide-angle end state (W) to the telephoto end state (T).
以下の表２に、第２実施例の諸元の値を掲げる。なお、望遠端状態（Ｔ）の焦点距離の６倍の撮影距離（Ｒ＝１７９６．９６４）に対する第２レンズ群Ｇ２のフォーカシング移動量は、広角端状態（Ｗ）において１０．６６２、中間焦点距離状態において１１．８０２、望遠端状態（Ｔ）において１４．７０８である。 Table 2 below lists values of specifications of the second embodiment. Note that the focusing movement amount of the second lens group G2 with respect to the shooting distance (R = 1799.964) which is six times the focal length in the telephoto end state (T) is 10.626 in the wide-angle end state (W), and the intermediate focal length. 11.802 in the state and 14.708 in the telephoto end state (T).
（表２）
［全体諸元］
ｆ＝７０．１００〜１３４．７９６〜２９９．４９４
ＦＮＯ＝４．１５〜５．００〜５．７１
２ω＝３５．３１〜１７．９８〜８．０２°
［レンズ諸元］
r d ν n
1 102.2678 1.8000 26.30 1.784700
2 71.9541 7.5378 81.61 1.497000
3 -1728.9812 0.5000
4 110.8478 4.4075 81.61 1.497000
5 1204.4025 (d 5)
6 -664.1959 3.1569 23.78 1.846660
7 -73.4661 1.4000 40.11 1.762000
8 98.7841 (d 8)
9 -59.7263 1.4000 48.31 1.666720
10 21.4802 4.0815 25.43 1.805180
11 51.2355 (d11)
12 49.9651 2.9728 39.23 1.595510
13 -167.9194 0.2000
14 63.8575 4.1743 81.61 1.497000
15 -32.5611 1.4000 34.96 1.801000
16 2306.6162 1.5000
17 ∞ (d17) 開口絞りＳ
18 68.2558 1.4000 23.78 1.846660
19 40.3020 3.9422
20 91.6754 3.7297 50.88 1.658440
21 -31.9507 1.4000 23.78 1.846660
22 -48.2132 0.2000
23 33.1365 2.6822 46.58 1.804000
24 136.2095 (d24)
25 64.7470 1.4000 46.58 1.804000
26 25.5605 15.7654
27 -38.4990 2.7540 23.78 1.846660
28 -21.0447 1.4000 46.58 1.804000
29 -110.3887 (B.f.)
［可変間隔データー］
（無限遠合焦状態）
広角端状態 中間焦点距離状態 望遠端状態
ｆ 70.10027 134.79626 299.49360
Ｄ０ ∞ ∞ ∞
d 5 1.36113 26.91037 51.88614
d 8 18.52012 19.11279 22.91443
d11 22.45861 13.25177 2.50000
d17 19.28976 13.70685 10.46431
d24 7.16594 5.64281 1.00000
B.f. 39.48069 55.79355 74.43084
Ｒ ∞ ∞ ∞
（最短撮影距離合焦状態）
広角端状態 中間焦点距離状態 望遠端状態
Ｍ -0.05787 -0.11095 -0.24289
Ｄ０ 1322.5193 1296.3774 1267.6000
d 5 14.66251 41.70897 70.51209
d 8 5.21874 4.31419 4.28848
d11 22.45861 13.25177 2.50000
d17 19.28976 13.70685 10.46431
d24 7.16594 5.64281 1.00000
B.f. 39.48069 55.79355 74.43084
Ｒ 1500.0000 1500.0000 1500.0000
［条件式対応値］
（１） 0.264
（２） -1.013
（３） 0.052
（４） 0.273
（５） 0.327
（６） −
（７） −
（８） 0.063
（９） 2.043
（１０） 1.794
（１１） -1.817
（１２） -0.690
（１３） 16.33
（１４） 22.88
（１５） 0.725
(Table 2)
[Overall specifications]
f = 70.100-134.796-299.494
FNO = 4.15-5.00-5.71
2ω = 35.31 to 17.98 to 8.02 °
[Lens specifications]
rd ν n
1 102.2678 1.8000 26.30 1.784700
2 71.9541 7.5378 81.61 1.497000
3 -1728.9812 0.5000
4 110.8478 4.4075 81.61 1.497000
5 1204.4025 (d 5)
6 -664.1959 3.1569 23.78 1.846660
7 -73.4661 1.4000 40.11 1.762000
8 98.7841 (d 8)
9 -59.7263 1.4000 48.31 1.666720
10 21.4802 4.0815 25.43 1.805180
11 51.2355 (d11)
12 49.9651 2.9728 39.23 1.595510
13 -167.9194 0.2000
14 63.8575 4.1743 81.61 1.497000
15 -32.5611 1.4000 34.96 1.801000
16 2306.6162 1.5000
17 ∞ (d17) Aperture stop S
18 68.2558 1.4000 23.78 1.846660
19 40.3020 3.9422
20 91.6754 3.7297 50.88 1.658440
21 -31.9507 1.4000 23.78 1.846660
22 -48.2132 0.2000
23 33.1365 2.6822 46.58 1.804000
24 136.2095 (d24)
25 64.7470 1.4000 46.58 1.804000
26 25.5605 15.7654
27 -38.4990 2.7540 23.78 1.846660
28 -21.0447 1.4000 46.58 1.804000
29 -110.3887 (Bf)
[Variable interval data]
(Infinite focus state)
Wide-angle end state Intermediate focal length state Telephoto end state f 70.10027 134.79626 299.49360
D0 ∞ ∞ ∞
d 8 18.52012 19.11279 22.91443
d11 22.45861 13.25177 2.50000
d17 19.28976 13.70685 10.46431
d24 7.16594 5.64281 1.00000
Bf 39.48069 55.79355 74.43084
R ∞ ∞ ∞
(Shortest focusing distance)
Wide-angle end state Intermediate focal length state Telephoto end state M -0.05787 -0.11095 -0.24289
D0 1322.5193 1296.3774 1267.6000
d 8 5.21874 4.31419 4.28848
d11 22.45861 13.25177 2.50000
d17 19.28976 13.70685 10.46431
d24 7.16594 5.64281 1.00000
Bf 39.48069 55.79355 74.43084
R 1500.0000 1500.0000 1500.0000
[Conditional expression values]
(1) 0.264
(2) -1.013
(3) 0.052
(4) 0.273
(5) 0.327
(6)-
(7)-
(8) 0.063
(9) 2.043
(10) 1.794
(11) -1.817
(12) -0.690
(13) 16.33
(14) 22.88
(15) 0.725
図６は第２実施例の広角端状態での諸収差図を示し、（ａ）は無限遠合焦状態の収差図を、（ｂ）は最短撮影距離（１５００ｍｍ）合焦状態の収差図をそれぞれ示す。図７は第２実施例の中間焦点距離状態での諸収差図を示し、（ａ）は無限遠合焦状態の収差図を、（ｂ）は最短撮影距離合焦状態の収差図をそれぞれ示す。図８は第２実施例の望遠端状態での諸収差図を示し、（ａ）は無限遠合焦状態の収差図を、（ｂ）は最短撮影距離合焦状態の収差図をそれぞれ示す。 FIG. 6 shows various aberration diagrams in the wide-angle end state of the second embodiment, (a) is an aberration diagram in the infinite focus state, and (b) is an aberration diagram in the shortest shooting distance (1500 mm) in focus state. Each is shown. FIG. 7 shows various aberration diagrams in the intermediate focal length state of the second embodiment, (a) shows an aberration diagram in the infinite focus state, and (b) shows an aberration diagram in the shortest shooting distance focus state. . FIG. 8 shows various aberration diagrams in the telephoto end state of the second embodiment, (a) shows an aberration diagram in the infinite focus state, and (b) shows an aberration diagram in the shortest shooting distance focus state.
各収差図から、本第２実施例は諸収差が良好に補正され、優れた結像性能を有していることが明らかである。 From each aberration diagram, it is apparent that the second embodiment has excellent imaging performance with various aberrations corrected well.
（第３実施例）
図９は本発明の第３実施例にかかる可変焦点距離レンズのレンズ構成図である。
(Third embodiment)
FIG. 9 is a lens configuration diagram of the variable focal length lens according to the third example of the present invention.
図９において、可変焦点距離レンズは、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、負屈折力の第３レンズ群Ｇ３と、正屈折力の第４レンズ群Ｇ４と、開口絞りＳと、正屈折力の第５レンズ群Ｇ５と、負屈折力の第６レンズ群Ｇ６から構成され、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第１レンズ群Ｇ１と第２レンズ群Ｇ２の空気間隔が増大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の空気間隔が増大し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の空気間隔が減少し、第４レンズ群Ｇ４と第５レンズ群Ｇ５の空気間隔が減少し、第５レンズ群Ｇ５と第６レンズ群Ｇ６の空気間隔が減少するように、第１レンズ群Ｇ１と第２レンズ群Ｇ２と第４レンズ群Ｇ４と第５レンズ群Ｇ５と第６レンズ群Ｇ６が物体方向に移動し、第３レンズ群Ｇ３は固定であり、遠距離状態から近距離状態へのフォーカシングは、第２レンズ群Ｇ２のみを像面Ｉ方向に移動させる構成である。 In FIG. 9, the variable focal length lens includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a negative refractive power, and a positive refraction. A fourth lens group G4 having a power, an aperture stop S, a fifth lens group G5 having a positive refractive power, and a sixth lens group G6 having a negative refractive power, and from a wide-angle end state (W) to a telephoto end state (T ), The air gap between the first lens group G1 and the second lens group G2 increases, the air gap between the second lens group G2 and the third lens group G3 increases, and the third lens group G3 and the second lens group G3 The air gap between the fourth lens group G4 is reduced, the air gap between the fourth lens group G4 and the fifth lens group G5 is reduced, and the air gap between the fifth lens group G5 and the sixth lens group G6 is reduced. 1 lens group G1, 2nd lens group G2, 4th lens group G4, 5th lens group G5, and 6th lens Group G6 moves toward the object, a third lens group G3 is fixed, the focusing from infinity to a close, a structure for moving only the second lens group G2 to the image plane I direction.
第１レンズ群Ｇ１は、物体側に凸面を向けた負メニスカスレンズと物体側に凸面を向けた正メニスカスレンズとの接合レンズと、物体側に凸面を向けた正メニスカスレンズからなる。 The first lens group G1 includes a cemented lens of a negative meniscus lens having a convex surface facing the object side and a positive meniscus lens having a convex surface facing the object side, and a positive meniscus lens having a convex surface facing the object side.
第２レンズ群Ｇ２は、物体側に凸面を向けた両凸形状の正レンズＬ２１と両凹形状の負レンズＬ２２との接合レンズからなる。 The second lens group G2 is composed of a cemented lens of a biconvex positive lens L21 having a convex surface directed toward the object side and a biconcave negative lens L22.
第３レンズ群Ｇ３は、両凹形状の負レンズＬ３１と物体側に凸面を向けた正メニスカスレンズＬ３２の接合レンズからなる。 The third lens group G3 includes a cemented lens including a biconcave negative lens L31 and a positive meniscus lens L32 having a convex surface directed toward the object side.
第４レンズ群Ｇ４は、両凸形状の正レンズと、両凸形状の正レンズと物体側に凹面を向けた負メニスカスレンズとの接合レンズからなる。 The fourth lens group G4 includes a cemented lens including a biconvex positive lens, a biconvex positive lens, and a negative meniscus lens having a concave surface directed toward the object side.
第５レンズ群Ｇ５は、物体側に凸面を向けた負メニスカスレンズと、両凸形状の正レンズと物体側に凹面を向けた負メニスカスレンズとの接合レンズと、物体側に凸面を向けた正メニスカスレンズからなる。 The fifth lens group G5 includes a negative meniscus lens having a convex surface directed toward the object side, a cemented lens of a biconvex positive lens and a negative meniscus lens having a concave surface directed toward the object side, and a positive lens having a convex surface directed toward the object side. It consists of a meniscus lens.
第６レンズ群Ｇ６は、物体側に凸面を向けた負メニスカスレンズと、物体側に凹面を向けた正メニスカスレンズと物体側に凹面を向けた負メニスカスレンズの接合レンズからなる。 The sixth lens group G6 includes a negative meniscus lens having a convex surface directed toward the object side, a positive meniscus lens having a concave surface directed toward the object side, and a cemented lens having a negative meniscus lens directed toward the object side.
開口絞りＳは、広角端状態（Ｗ）から望遠端状態（Ｔ）への変倍に際し、第４レンズ群Ｇ４と一緒に移動する。 The aperture stop S moves together with the fourth lens group G4 when zooming from the wide-angle end state (W) to the telephoto end state (T).
以下の表３に、第３実施例の諸元の値を掲げる。なお、望遠端状態（Ｔ）の焦点距離の６倍の撮影距離（Ｒ＝１７９８．３９８）に対する第２レンズ群Ｇ２のフォーカシング移動量は、広角端状態（Ｗ）において１２．２５４、中間焦点距離状態において１３．７９４、望遠端状態（Ｔ）において１７．９７６である。 Table 3 below lists values of specifications of the third example. The focusing movement amount of the second lens group G2 with respect to the shooting distance (R = 1798.398) that is six times the focal length in the telephoto end state (T) is 12.254 in the wide-angle end state (W), and the intermediate focal length. 13.794 in the state and 17.976 in the telephoto end state (T).
（表３）
［全体諸元］
ｆ＝７０．１０１〜１３４．９２７〜２９９．７３３
ＦＮＯ＝４．２５〜５．２２〜５．７７
２ω＝３４．９０〜１７．９２〜８．０２°
［レンズ諸元］
r d ν n
1 120.1885 1.8000 29.23 1.721510
2 76.4437 6.2717 81.61 1.497000
3 1230.5570 0.5000
4 92.3947 4.9702 81.61 1.497000
5 1178.0199 (d 5)
6 387.2031 4.4370 23.78 1.846660
7 -126.1098 1.4000 39.59 1.804400
8 86.9982 (d 8)
9 -59.3119 1.4000 40.11 1.762000
10 21.3838 3.3165 23.78 1.846660
11 76.4795 (d11)
12 79.8909 2.1955 40.75 1.581440
13 -120.8385 0.2000
14 49.0315 4.0779 81.61 1.497000
15 -29.6374 1.4000 42.24 1.799520
16 -825.6239 1.5000
17 ∞ (d17) 開口絞りＳ
18 73.3833 1.4000 23.78 1.846660
19 38.2435 3.5106
20 68.8450 4.2822 61.18 1.589130
21 -27.0888 1.4000 23.78 1.846660
22 -36.2510 0.2000
23 33.4719 2.5863 46.58 1.804000
24 165.4826 (d24)
25 72.4751 1.4000 46.58 1.804000
26 24.0618 10.8312
27 -36.4476 2.7614 23.78 1.846660
28 -19.2437 1.4000 46.58 1.804000
29 -89.7370 (B.f.)
［可変間隔データー］
（無限遠合焦状態）
広角端状態 中間焦点距離状態 望遠端状態
ｆ 70.10126 134.92683 299.73280
Ｄ０ ∞ ∞ ∞
d 5 2.00000 25.75369 53.99811
d 8 29.00000 29.95000 31.95702
d11 20.51376 10.87541 2.50000
d17 15.30235 9.17552 5.30941
d24 7.94331 6.28705 1.00000
B.f. 39.51671 56.93819 74.46668
Ｒ ∞ ∞ ∞
（最短撮影距離合焦状態）
広角端状態 中間焦点距離状態 望遠端状態
Ｍ -0.05755 -0.11069 -0.24135
Ｄ０ 1322.4833 1297.7796 1267.5284
d 5 17.32233 43.09425 76.90017
d 8 13.67767 12.60944 9.05496
d11 20.51376 10.87541 2.50000
d17 15.30235 9.17552 5.30941
d24 7.94331 6.28705 1.00000
B.f. 39.51671 56.93819 74.46668
Ｒ 1500.0000 1500.0000 1500.0000
［条件式対応値］
（１） 0.414
（２） -1.134
（３） 0.107
（４） 0.290
（５） 0.456
（６） −
（７） −
（８） 0.042
（９） 1.824
（１０） 1.888
（１１） -2.142
（１２） -0.706
（１３） 15.81
（１４） 16.33
（１５） 0.682
(Table 3)
[Overall specifications]
f = 70.101 to 134.927 to 299.733
FNO = 4.25-5.22-5.77
2ω = 34.90-17.92-8.02 °
[Lens specifications]
rd ν n
1 120.1885 1.8000 29.23 1.721510
2 76.4437 6.2717 81.61 1.497000
3 1230.5570 0.5000
4 92.3947 4.9702 81.61 1.497000
5 1178.0199 (d 5)
6 387.2031 4.4370 23.78 1.846660
7 -126.1098 1.4000 39.59 1.804400
8 86.9982 (d 8)
9 -59.3119 1.4000 40.11 1.762000
10 21.3838 3.3165 23.78 1.846660
11 76.4795 (d11)
12 79.8909 2.1955 40.75 1.581440
13 -120.8385 0.2000
14 49.0315 4.0779 81.61 1.497000
15 -29.6374 1.4000 42.24 1.799520
16 -825.6239 1.5000
17 ∞ (d17) Aperture stop S
18 73.3833 1.4000 23.78 1.846660
19 38.2435 3.5106
20 68.8450 4.2822 61.18 1.589130
21 -27.0888 1.4000 23.78 1.846660
22 -36.2510 0.2000
23 33.4719 2.5863 46.58 1.804000
24 165.4826 (d24)
25 72.4751 1.4000 46.58 1.804000
26 24.0618 10.8312
27 -36.4476 2.7614 23.78 1.846660
28 -19.2437 1.4000 46.58 1.804000
29 -89.7370 (Bf)
[Variable interval data]
(Infinite focus state)
Wide-angle end state Intermediate focal length state Telephoto end state f 70.10126 134.92683 299.73280
D0 ∞ ∞ ∞
d 8 29.00000 29.95000 31.95702
d11 20.51376 10.87541 2.50000
d17 15.30235 9.17552 5.30941
d24 7.94331 6.28705 1.00000
Bf 39.51671 56.93819 74.46668
R ∞ ∞ ∞
(Shortest focusing distance)
Wide-angle end state Intermediate focal length state Telephoto end state M -0.05755 -0.11069 -0.24135
D0 1322.4833 1297.7796 1267.5284
d 8 13.67767 12.60944 9.05496
d11 20.51376 10.87541 2.50000
d17 15.30235 9.17552 5.30941
d24 7.94331 6.28705 1.00000
Bf 39.51671 56.93819 74.46668
R 1500.0000 1500.0000 1500.0000
[Conditional expression values]
(1) 0.414
(2) -1.134
(3) 0.107
(4) 0.290
(5) 0.456
(6)-
(7)-
(8) 0.042
(9) 1.824
(10) 1.888
(11) -2.142
(12) -0.706
(13) 15.81
(14) 16.33
(15) 0.682
図１０は第３実施例の広角端状態での諸収差図を示し、（ａ）は無限遠合焦状態の収差図を、（ｂ）は最短撮影距離（１５００ｍｍ）合焦状態の収差図をそれぞれ示す。図１１は第３実施例の中間焦点距離状態での諸収差図を示し、（ａ）は無限遠合焦状態の収差図を、（ｂ）は最短撮影距離合焦状態の収差図をそれぞれ示す。図１２は第３実施例の望遠端状態での諸収差図を示し、（ａ）は無限遠合焦状態の収差図を、（ｂ）は最短撮影距離合焦状態の収差図をそれぞれ示す。 10A and 10B show various aberration diagrams in the wide-angle end state of the third example. FIG. 10A is an aberration diagram in the infinite focus state, and FIG. 10B is an aberration diagram in the shortest shooting distance (1500 mm). Each is shown. FIG. 11 shows various aberration diagrams in the intermediate focal length state of the third embodiment, (a) shows an aberration diagram in the infinite focus state, and (b) shows an aberration diagram in the shortest shooting distance focus state. . 12A and 12B show various aberration diagrams in the telephoto end state of the third embodiment. FIG. 12A shows an aberration diagram in the infinite focus state, and FIG. 12B shows an aberration diagram in the shortest shooting distance focus state.
各収差図から、本第３実施例は諸収差が良好に補正され、優れた結像性能を有していることが明らかである。 From each aberration diagram, it is apparent that the third embodiment has excellent imaging performance with various aberrations corrected well.
なお、本発明の可変焦点距離レンズに防振機能を付加する場合には、第３レンズ群を光軸と直交方向に移動させて像面上の像ぶれ補正を行う方式が望ましい。第３レンズ群は変倍時と合焦時のいずれにおいても移動しないので、防振のためのレンズ移動機構を組み込むのに好適である。 In addition, when the image stabilization function is added to the variable focal length lens according to the present invention, it is desirable to perform the image blur correction on the image plane by moving the third lens group in the direction orthogonal to the optical axis. Since the third lens group does not move either during zooming or in focus, it is suitable for incorporating a lens moving mechanism for image stabilization.
なお、上述の実施の形態は例に過ぎず、上述の構成や形状に限定されるものではなく、本発明の範囲内において適宜修正、変更が可能である。 The above-described embodiment is merely an example, and is not limited to the above-described configuration and shape, and can be appropriately modified and changed within the scope of the present invention.
Ｇ１ 第１レンズ群
Ｇ２ 第２レンズ群
Ｇ３ 第３レンズ群
Ｇ４ 第４レンズ群
Ｇ５ 第５レンズ群
Ｇ６ 第６レンズ群
Ｓ 開口絞り
Ｉ 像面
G1 1st lens group G2 2nd lens group G3 3rd lens group G4 4th lens group G5 5th lens group G6 6th lens group S Aperture stop I Image surface
Claims (9)
０．２１＜Ｄ２３ｗ／ｆｗ＜０．５
但し、
ｆｗは前記広角端状態における前記可変焦点距離レンズの焦点距離、
Ｄ２３ｗは前記広角端状態で無限遠合焦状態における前記第２レンズ群と前記第３レンズ群の光軸上での空気間隔である。 In order from the object side, it has a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with negative refractive power, and a fourth lens group with positive refractive power, and is in a wide-angle end state. The first lens group so that the distance between the first lens group and the second lens group increases and the distance between the third lens group and the fourth lens group decreases during zooming from the telephoto end to the telephoto end state. Moves in the object direction, the third lens group is fixed, the fourth lens group moves in the object direction, and the second lens group is moved in the image plane direction during focusing from a long distance state to a short distance state. And a variable focal length lens that satisfies the following conditions:
0.21 <D23w / fw <0.5
However,
fw is the focal length of the variable focal length lens in the wide-angle end state,
D23w is an air space on the optical axis of the second lens group and the third lens group in the infinitely focused state at the wide-angle end state.
−２．０＜ｆ２／ｆ１＜−０．５
−０．３＜ｆｗ／ｆ１２ｗ＜０．２
０．１４＜ｆｗ／ｆ１２ｔ＜０．４
０．２１＜Ｄ２３ｔ／ｆｗ＜０．６
但し、
ｆ１は前記第１レンズ群の焦点距離、
ｆ２は前記第２レンズ群の焦点距離、
ｆ１２ｗは前記広角端状態で無限遠合焦状態における前記第１レンズ群と前記第２レンズ群の合成焦点距離、
ｆ１２ｔは前記望遠端状態で無限遠合焦状態における前記第１レンズ群と前記第２レンズ群の合成焦点距離、
Ｄ２３ｔは前記望遠端状態で無限遠合焦状態における前記第２レンズ群と前記第３レンズ群の光軸上での空気間隔である。 The variable focal length lens according to claim 1, wherein the following condition is satisfied.
−2.0 <f2 / f1 <−0.5
−0.3 <fw / f12w <0.2
0.14 <fw / f12t <0.4
0.21 <D23t / fw <0.6
However,
f1 is the focal length of the first lens group,
f2 is the focal length of the second lens group,
f12w is a combined focal length of the first lens group and the second lens group in the infinitely focused state at the wide-angle end state;
f12t is a combined focal length of the first lens group and the second lens group in the infinitely focused state in the telephoto end state;
D23t is an air space on the optical axis of the second lens group and the third lens group in the telephoto end state and in the infinitely focused state.
Ｍ２ｗ＜−１．５
１．５＜Ｍ２ｔ
但し、
Ｍ２ｗは前記広角端状態の無限遠合焦時における前記第２レンズ群の倍率、
Ｍ２ｔは前記望遠端状態の無限遠合焦時における前記第２レンズ群の倍率である。 3. The second lens group is fixed during zooming from the wide-angle end state to the telephoto end state in an infinitely focused state, and satisfies the following conditions: 3. The variable focal length lens described in 1.
M2w <−1.5
1.5 <M2t
However,
M2w is a magnification of the second lens group at the time of focusing on infinity at the wide-angle end state,
M2t is the magnification of the second lens group at the time of focusing at infinity in the telephoto end state.
０．０＜（Ｄ２３ｔ−Ｄ２３ｗ）／ｆｗ＜０．１
１．５＜Ｍ２ｔ
但し、
Ｍ２ｔは前記望遠端状態の無限遠合焦時における前記第２レンズ群の倍率である。 In the infinite focus state, when zooming from the wide-angle end state to the telephoto end state, the air gap between the second lens group and the third lens group is more in the telephoto end state than in the wide-angle end state. 3. The variable focal length lens according to claim 1, wherein the second lens group moves so as to increase at a distance satisfying the following condition.
0.0 <(D23t−D23w) / fw <0.1
1.5 <M2t
However,
M2t is the magnification of the second lens group at the time of focusing at infinity in the telephoto end state.
１．５＜ｆ１／ｆｗ＜２．０
−３．０＜ｆ２／ｆｗ＜−０．８
−１．０＜ｆ３／ｆｗ＜−０．５
但し、ｆ３は前記第３レンズ群の焦点距離である。 The variable focal length lens according to claim 1, wherein the following condition is satisfied.
1.5 <f1 / fw <2.0
−3.0 <f2 / fw <−0.8
−1.0 <f3 / fw <−0.5
Here, f3 is the focal length of the third lens group.
１０＜ν２ｎ−ν２ｐ
１０＜ν３ｎ−ν３ｐ
但し、
ν２ｎは前記第２レンズ群中の前記両凹形状の負レンズのｄ線（λ＝５８７．６ｎｍ）に対するアッベ数、
ν２ｐは前記第２レンズ群中の前記正レンズのｄ線（λ＝５８７．６ｎｍ）に対するアッベ数、
ν３ｎは前記第３レンズ群中の前記両凹形状の負レンズのｄ線（λ＝５８７．６ｎｍ）に対するアッベ数、
ν３ｐは前記第３レンズ群中の前記正レンズのｄ線（λ＝５８７．６ｎｍ）に対するアッベ数である。 The second lens group includes a cemented lens of a positive lens and a biconcave negative lens in order from the object side, and the third lens group includes a biconcave negative lens and a positive lens in order from the object side. The variable focal length lens according to claim 1, comprising a cemented lens and satisfying the following condition.
10 <ν2n−ν2p
10 <ν3n−ν3p
However,
ν2n is the Abbe number for the d-line (λ = 587.6 nm) of the biconcave negative lens in the second lens group,
ν2p is the Abbe number for the d-line (λ = 587.6 nm) of the positive lens in the second lens group,
ν3n is the Abbe number for the d-line (λ = 587.6 nm) of the biconcave negative lens in the third lens group,
ν3p is the Abbe number with respect to the d-line (λ = 587.6 nm) of the positive lens in the third lens group.
０．６＜Ｋｗ／Ｋｔ＜１．３
但し、
Ｋｗは前記広角端状態において、無限遠合焦状態から前記望遠端状態のときの焦点距離の６倍の距離の位置に合焦する際の、前記第２レンズ群の像面方向への移動量、
Ｋｔは前記望遠端状態において、無限遠合焦状態から前記望遠端状態のときの焦点距離の６倍の距離の位置に合焦する際の、前記第２レンズ群の像面方向への移動量である。 The variable focal length lens according to claim 1, wherein the following condition is satisfied.
0.6 <Kw / Kt <1.3
However,
Kw is the amount of movement of the second lens group in the image plane direction when focusing at a position that is six times the focal length in the telephoto end state from the infinite focus state in the wide-angle end state. ,
Kt is the amount of movement in the image plane direction of the second lens group when focusing at a position that is six times the focal length in the telephoto end state from the infinite focus state in the telephoto end state. It is.
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| JP2004099807A JP2005284099A (en) | 2004-03-30 | 2004-03-30 | Variable focal length lens |
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| JP2004099807A JP2005284099A (en) | 2004-03-30 | 2004-03-30 | Variable focal length lens |
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