JP2015215438A5

JP2015215438A5 -

Info

Publication number: JP2015215438A5
Application number: JP2014097424A
Authority: JP
Filing date: 2014-05-09
Publication date: 2017-06-15
Anticipated expiration: 2034-05-09

Description

本発明のズームレンズは、物体側から像側へ順に配置された、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、正の屈折力の第３レンズ群、負の屈折力の第４レンズ群、複数のレンズ群を含む後群より構成され、ズーミング又はフォーカシングの少なくとも一方に際して隣り合うレンズ群の間隔が変化するズームレンズにおいて、
前記後群は、正の屈折力のレンズ群Ｌｐと、該レンズ群Ｌｐの像側に配置された負の屈折力のレンズ群Ｌｎを有し、
無限遠から近距離へのフォーカシングに際して、前記レンズ群Ｌｐは物体側に移動し、前記レンズ群Ｌｎは像側に移動し、
広角端において無限遠にフォーカスしているときにおける前記第４レンズ群と前記レンズ群Ｌｐとの光軸上の間隔をｄｐｗ、望遠端において無限遠にフォーカスしているときにおける前記第４レンズ群と前記レンズ群Ｌｐとの光軸上の間隔をｄｐｔ、広角端において無限遠にフォーカスしているときにおける前記レンズ群Ｌｎと該レンズ群Ｌｎの像側に隣接して配置されたレンズ群との光軸上の間隔をｄｎｗ、望遠端において無限遠にフォーカスしているときにおける前記レンズ群Ｌｎと該レンズ群Ｌｎの像側に隣接して配置されたレンズ群との光軸上の間隔をｄｎｔとし、前記レンズ群Ｌｎの像側に配置されたレンズ群が存在しないときの前記間隔ｄｎｗ及びｄｎｔを、それぞれ広角端と望遠端における前記レンズ群Ｌｎと像面との光軸上の間隔とするとき、
１．０＜ｄｐｔ／ｄｐｗ＜２０．０
１．０＜ｄｎｔ／ｄｎｗ＜２０．０
なる条件式を満足することを特徴としている。 The zoom lens according to the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, arranged in order from the object side to the image side. In a zoom lens that includes a fourth lens group having a refractive power and a rear group including a plurality of lens groups, and in which at least one of zooming and focusing, the distance between adjacent lens groups changes.
The rear group includes a lens unit Lp having a positive refractive power, a lens unit Ln having negative refractive power disposed on the image side of the lens group Lp,
When focusing from infinity to a short distance, the lens unit Lp moves to the object side, the lens unit Ln moves to the image side,
Wherein the definitive spacing on the optical axis of infinity definitive care to be focused the fourth lens group and front Symbol lens group Lp at the wide-angle end DPW, to come to be focused on infinity in the telephoto end the distance along the optical axis between the fourth lens group and the front Symbol lens Lp dpt, adjacent to the image side of the lens unit Ln and the lens unit Ln of definitive to come to be focused on infinity in the wide-angle end dnw the distance along the optical axis between the lens disposed group, infinity disposed adjacent to the image side of the lens unit Ln and the lens unit Ln to definitive care to be focused lens group at the telephoto end and dnt a space on the optical axis between, the spacing dnw and dnt when the lens group disposed on the image side of the lens unit Ln is absent, the lens unit Ln in wide Kakutan and the telephoto end, respectively it On the optical axis When the interval,
1.0 <dpt / dpw <20.0
1.0 <dnt / dnw <20.0
It satisfies the following conditional expression.

以下に本発明の好ましい実施の形態を、添付の図面に基づいて詳細に説明する。本発明のズームレンズは、物体側から像側へ順に配置された、正の屈折力の第１レンズ群、負の屈折力の第２レンズ群、正の屈折力の第３レンズ群、負の屈折力の第４レンズ群、複数のレンズ群を含む後群より構成される。ズーミング又はフォーカシングの少なくとも一方に際して隣り合うレンズ群の間隔が変化する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The zoom lens according to the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, arranged in order from the object side to the image side. A fourth lens group having a refractive power and a rear group including a plurality of lens groups. The distance between adjacent lens groups changes during at least one of zooming and focusing.

後群は、正の屈折力のレンズ群Ｌｐと、レンズ群Ｌｐの像側に配置された負の屈折力のレンズ群Ｌｎを有している。無限遠から近距離へのフォーカシングに際して、レンズ群Ｌｐは物体側に移動し、レンズ群Ｌｎは像側に移動する。 The rear group includes a positive lens group Lp refractive power, the negative which is disposed on the image side of the lens unit Lp lens unit Ln refractive power. During focusing from infinity to a short distance, the lens unit Lp moves to the object side, and the lens unit Ln moves to the image side.

実施例１において、後群ＬＲは物体側から像側へ順に配置された、正の屈折力の第５レンズ群Ｌ５、負の屈折力の第６レンズ群Ｌ６、負の屈折力の第７レンズ群Ｌ７より構成されている。第５レンズ群Ｌ５はレンズ群Ｌｐであり、第６レンズ群Ｌ６はレンズ群Ｌｎである。ズーミングに際して第５レンズ群Ｌ５と第６レンズ群Ｌ６は同じ（同一の）軌跡で移動する。 In Example 1, the rear lens group LR is arranged in order from the object side to the image side. The fifth lens unit L5 having a positive refractive power, the sixth lens unit L6 having a negative refractive power, and the seventh lens having a negative refractive power. It consists of group L7. The fifth lens group L5 is a lens group Lp, and the sixth lens group L6 is a lens group Ln. During zooming, the fifth lens unit L5 and the sixth lens unit L6 move along the same (same) locus.

実施例２において、後群ＬＲは物体側から像側へ順に配置された、正の屈折力の第５レンズ群Ｌ５、負の屈折力の第６レンズ群Ｌ６より構成されている。第５レンズ群Ｌ５はレンズ群Ｌｐであり、第６レンズ群Ｌ６はレンズ群Ｌｎである。ズーミングに際して第５レンズ群Ｌ５と第６レンズ群Ｌ６は互いに異なる軌跡で移動する。 In the second embodiment, the rear group LR includes a fifth lens unit L5 having a positive refractive power and a sixth lens unit L6 having a negative refractive power, which are arranged in order from the object side to the image side. The fifth lens group L5 is a lens group Lp, and the sixth lens group L6 is a lens group Ln. And the fifth lens unit L5 sixth lens unit L6 moves in different that locus from each other during zooming.

各実施例では開口絞りＳＰよりも像側に２つのフォーカスレンズ群が配置されている。無限遠から近距離へフォーカシングするときには２つのレンズ群を異なった軌跡で移動させるフローティングフォーカス方式を用いている。この２つのフォーカシングに際して移動するレンズ群のうち一つは正の屈折力のレンズ群Ｌｐであり、もう一つは負の屈折力のレンズ群Ｌｎである。各実施例では物体側から像側へ順に、レンズ群Ｌｐ、レンズ群Ｌｐの像側に隣接してレンズ群Ｌｎを配置している。Focusに関する矢印で示すように無限遠から近距離へのフォーカシングに際し、レンズ群Ｌｐは物体側に、レンズ群Ｌｎは像側に移動する。 In each embodiment, two focus lens groups are arranged on the image side of the aperture stop SP. When focusing from infinity to a short distance, a floating focus method is used in which the two lens groups are moved along different paths. One of the lens groups that move during the two focusing operations is a lens unit Lp having a positive refractive power, and the other is a lens unit Ln having a negative refractive power. In order from the object side to the image side in the embodiment, the lens group Lp, the lens unit Ln adjacent to the image side of the lens unit Lp and placed. As indicated by the arrow related to Focus, when focusing from infinity to a short distance, the lens unit Lp moves to the object side and the lens unit Ln moves to the image side.

ここでレンズ群Ｌｎは最も像側のレンズ群又は最も像側のレンズ群に隣接したレンズ群である。即ちレンズ群Ｌｎは後群ＬＲに含まれるレンズ群Ｌｐの中で最も像側に配置されているか又は後群ＬＲに含まれるレンズ群のうち像側から数えて２番目に配置されている。広角端において無限遠にフォーカスしているときにおける第４レンズ群Ｌ４と、レンズ群Ｌｐとの光軸上の間隔をｄｐｗ、望遠端において無限遠にフォーカスしているときにおける第４レンズ群Ｌ４と、レンズ群Ｌｐとの光軸上の間隔をｄｐｔとする。 Here, the lens group Ln is a lens group closest to the image side or adjacent to the lens group closest to the image side. In other words, the lens group Ln is disposed closest to the image side among the lens groups Lp included in the rear group LR, or is disposed second from the image side among the lens groups included in the rear group LR. Fourth to definitive care and the fourth lens unit L4 to definitive care to be focused on infinity in the wide-angle end, the spacing on the optical axis of the lens group Lp DPW, and is focused on infinity in the telephoto end The distance on the optical axis between the lens unit L4 and the lens unit Lp is dpt.

広角端において無限遠にフォーカスしているときにおけるレンズ群Ｌｎと、レンズ群Ｌｎの像側に隣接して配置されたレンズ群との光軸上の間隔をｄｎｗとする。望遠端において無限遠にフォーカスしているときにおけるレンズ群Ｌｎと、レンズ群Ｌｎの像側に隣接して配置されたレンズ群との光軸上の間隔をｄｎｔとする。レンズ群Ｌｎの像側に配置されたレンズ群が存在しないときの前記間隔ｄｎｗ，ｄｎｔをそれぞれ、広角端と望遠端における前記レンズ群Ｌｎと像面との光軸上の間隔とする。
このとき、
１．０＜ｄｐｔ／ｄｐｗ＜２０．０・・・（１）
１．０＜ｄｎｔ／ｄｎｗ＜２０．０・・・（２）
なる条件式を満足する。 A lens group Ln which definitive care to be focused on infinity in the wide-angle end, the spacing on the optical axis of the lens group arranged adjacent to the image side of the lens unit Ln and dnw. A lens group Ln which definitive care to be focused on infinity at the telephoto end, the spacing on the optical axis of the lens group arranged adjacent to the image side of the lens unit Ln and dnt. Lenses group Ln image the interval when placed lens group does not exist in the side dnw of, respectively dnt, the distance on the optical axis between the lens unit Ln and the image plane at the wide-angle end and the telephoto end.
At this time,
1.0 <dpt / dpw <20.0 (1)
1.0 <dnt / dnw <20.0 (2)
The following conditional expression is satisfied.

次に各実施例のレンズ構成について説明する。
［実施例１］
図１を参照して、本発明の実施例１のズームレンズＯＬについて説明する。実施例１のズームレンズＯＬは焦点距離２８．９ｍｍから２０４．０ｍｍのズームレンズである。実施例１のズームレンズＯＬは、物体側から像側へ順に配置された、正の屈折力の第１レンズ群Ｌ１、負の屈折力の第２レンズ群Ｌ２、開口絞りＳＰ、正の屈折力の第３レンズ群Ｌ３を有する。さらに負の屈折力の第４レンズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５、負の屈折力の第６レンズ群Ｌ６、負の屈折力の第７レンズ群Ｌ７を有する。 Next, the lens configuration of each example will be described.
[Example 1]
With reference to FIG. 1, the zoom lens OL of Example 1 of the present invention will be described. The zoom lens OL of Example 1 is a zoom lens having a focal length of 28.9 mm to 204.0 mm. The zoom lens OL of Example 1 includes a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, an aperture stop SP, and a positive refractive power, which are arranged in order from the object side to the image side. The third lens unit L3. Furthermore, it has a fourth lens unit L4 having a negative refractive power, a fifth lens unit L5 having a positive refractive power, a sixth lens unit L6 having a negative refractive power, and a seventh lens unit L7 having a negative refractive power.

実施例１のズームレンズＯＬは、物体側から像側へ順に配置された、正の屈折力の第１レンズ群Ｌ１、負の屈折力の第２レンズ群Ｌ２、開口絞りＳＰ、正の屈折力の第３レンズ群Ｌ３を有する。さらに負の屈折力の第４レンズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５、負の屈折力の第６レンズ群Ｌ６を有する。無限遠から近距離へのフォーカシングに際して第５レンズ群Ｌ５（Ｌｐ）が物体側へ第６レンズ群Ｌ６（Ｌｎ）は像側へ移動する。第５レンズ群Ｌ５ろがレンズ群Ｌｐに第６レンズ群Ｌ６がレンズ群Ｌｎに相当する。 The zoom lens OL of Example 1 includes a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, an aperture stop SP, and a positive refractive power, which are arranged in order from the object side to the image side. The third lens unit L3. Furthermore, it has a fourth lens unit L4 having a negative refractive power, a fifth lens unit L5 having a positive refractive power, and a sixth lens unit L6 having a negative refractive power. During focusing from infinity to a short distance, the fifth lens unit L5 (Lp) moves to the object side and the sixth lens unit L6 (Ln) moves to the image side. The fifth lens unit L5 is equivalent to the lens unit Lp, and the sixth lens unit L6 is equivalent to the lens unit Ln.

Claims

A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a negative refractive power, which are arranged in order from the object side to the image side. In a zoom lens that includes a rear group including a plurality of lens groups, and in which the distance between adjacent lens groups changes during at least one of zooming and focusing,
The rear group includes a lens unit Lp having a positive refractive power, a lens unit Ln having negative refractive power disposed on the image side of the lens group Lp,
When focusing from infinity to a short distance, the lens unit Lp moves to the object side, the lens unit Ln moves to the image side,
Wherein the definitive spacing on the optical axis of infinity definitive care to be focused the fourth lens group and front Symbol lens group Lp at the wide-angle end DPW, to come to be focused on infinity in the telephoto end the distance along the optical axis between the fourth lens group and the front Symbol lens Lp dpt, adjacent to the image side of the lens unit Ln and the lens unit Ln of definitive to come to be focused on infinity in the wide-angle end dnw the distance along the optical axis between the lens disposed group, infinity disposed adjacent to the image side of the lens unit Ln and the lens unit Ln to definitive care to be focused lens group at the telephoto end and dnt a space on the optical axis between, the spacing dnw and dnt when the lens group disposed on the image side of the lens unit Ln is absent, the lens unit Ln in wide Kakutan and the telephoto end, respectively it On the optical axis When the interval,
1.0 <dpt / dpw <20.0
1.0 <dnt / dnw <20.0
A zoom lens satisfying the following conditional expression:

When the focal length of the lens group Lp fp, a focal length of the entire system at the wide angle end and fw,
1.0 <fp / fw <8.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.

When the focal length of the lens unit Ln is fn and the focal length of the entire system at the wide angle end is fw,
1.0 <| fn / fw | <8.0
The zoom lens according to claim 1 or 2, characterized by satisfying the conditional expression.

Before SL lens unit Ln zoom lens according to any one of claims 1 to 3, characterized in that it is disposed adjacent to the image side of the lens group Lp.

5. The zoom lens according to claim 1 , wherein the lens group Ln is disposed closest to the image side among the lens groups included in the rear group .

5. The zoom lens according to claim 1, wherein the lens group Ln is disposed secondly from the image side among the lens groups included in the rear group.

The rear group includes a fifth lens group having a positive refractive power, a sixth lens group having a negative refractive power, and a seventh lens group having a negative refractive power, which are arranged in order from the object side to the image side. The fifth lens group is the lens group Lp, the sixth lens group is the lens group Ln, and the fifth lens group and the sixth lens group move along the same locus during zooming. The zoom lens according to claim 1.

The rear group includes a fifth lens group having a positive refractive power and a sixth lens group having a negative refractive power arranged in order from the object side to the image side, and the fifth lens group is the lens group Lp. There, the a sixth lens group said lens groups Ln, either during the claims 1 to 4 wherein the fifth lens group and the sixth lens group is characterized by moving at different that locus together zooming 1 the zoom lens according to claim.

The zoom lens according to any one of claims 1 to 8 and forming an image on a photoelectric conversion element.

A zoom lens according to any one of claims 1 to 9, the imaging device characterized by comprising a photoelectric conversion element for receiving an image formed by the zoom lens.