JP2016151663A5 - - Google Patents
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- JP2016151663A5 JP2016151663A5 JP2015028904A JP2015028904A JP2016151663A5 JP 2016151663 A5 JP2016151663 A5 JP 2016151663A5 JP 2015028904 A JP2015028904 A JP 2015028904A JP 2015028904 A JP2015028904 A JP 2015028904A JP 2016151663 A5 JP2016151663 A5 JP 2016151663A5
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- Prior art keywords
- lens group
- lens
- refractive power
- optical system
- positive refractive
- Prior art date
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Claims (7)
前記第２レンズ群は、正の屈折力を有するレンズ１枚と、負の屈折力を有するレンズ１枚とから構成され、
前記第１レンズ群及び前記第３レンズ群の少なくともいずれか一方のレンズ群は、物体側及び像面側が共に空気との界面を有する正の屈折力を有する単レンズを少なくとも１枚含み、
前記第１レンズ群と前記第３レンズ群とを光軸方向に固定し、前記第２レンズ群を光軸方向に移動させることで無限遠物体から有限距離物体への合焦を行い、
以下の条件を満足することを特徴とする光学系。
０．５６ ＜ ｜ｆ２｜／ｆ ＜ ０．９２ ・・・（１）
νｄｐｍｉｎ ＜ ４０．２ ・・・（２）
１５ ＜ νｄ２ｎ−νｄ２ｐ ≦ ４０．４１４ ・・・（３ａ）
但し、
ｆ２：前記第２レンズ群の焦点距離
ｆ：当該光学系の焦点距離
νｄｐｍｉｎ：前記第１レンズ群又は前記第３レンズ群に含まれる正の屈折力を有する単レンズであって、最もアッベ数の小さな単レンズのｄ線に対するアッベ数
νｄ２ｎ：前記第２レンズ群に含まれる負の屈折力を有するレンズのｄ線に対するアッベ数
νｄ２ｐ：前記第２レンズ群に含まれる正の屈折力を有するレンズのｄ線に対するアッベ数
である。 In order from the object side, the first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power,
The second lens group includes one lens having a positive refractive power and one lens having a negative refractive power,
At least one of the first lens group and the third lens group includes at least one single lens having a positive refractive power in which both the object side and the image plane side have an interface with air,
The first lens group and the third lens group are fixed in the optical axis direction, and the second lens group is moved in the optical axis direction to perform focusing from an infinite object to a finite distance object,
An optical system characterized by satisfying the following conditions.
0.56 <| f2 | / f <0.92 (1)
νdpmin <40.2 (2)
15 <νd2n−νd2p ≦ 40.414 (3a)
However,
f2: focal length of the second lens group f: focal length of the optical system νdpmin: a single lens having a positive refractive power included in the first lens group or the third lens group, and having the highest Abbe number Abbe number with respect to d-line of small single lens νd2n: Abbe number with respect to d-line of lens having negative refractive power included in second lens group νd2p: Lens having positive refractive power included in second lens group Abbe number for d line.
０．５０ ＜ ｆ３／ｆ ＜ １．１０ ・・・（４）
但し、
ｆ３：前記第３レンズ群の焦点距離
である。 The optical system according to claim 1, wherein the third lens group satisfies the following condition.
0.50 <f3 / f <1.10 (4)
However,
f3: the focal length of the third lens group.
０ ＜ Ｃｒ３ａｆ／ｆ ・・・（５）
但し、
Ｃｒ３ａｆ：前記第３レンズ群の最も物体側の面の曲率半径
である。 The optical system according to claim 1, wherein a surface closest to the object side of the third lens group satisfies the following condition.
0 <Cr3af / f (5)
However,
Cr3af: the radius of curvature of the most object side surface of the third lens group.
１．０ ＜ Ｃｒ３ａｆ／Ｃｒ２ｎｒ ＜ ４．０ ・・・（６）
但し、
Ｃｒ３ａｆ：前記第３レンズ群の最も物体側の面の曲率半径
Ｃｒ２ｎｒ：前記第２レンズ群の最も像面側の面の曲率半径
である。 The optical system according to any one of claims 1 to 3, wherein a surface closest to the object side of the third lens group and a surface closest to the image plane of the second lens group satisfy the following condition. .
1.0 <Cr3af / Cr2nr <4.0 (6)
However,
Cr3af: radius of curvature of the surface closest to the object side of the third lens group Cr2nr: radius of curvature of the surface closest to the image plane of the second lens group.
０．８ ＜ ｆ１／ｆ ＜ １．０ ・・・（７）
但し、
ｆ１：前記第１レンズ群の焦点距離
である。 The optical system according to any one of claims 1 to 4, wherein the first lens group satisfies the following condition.
0.8 <f1 / f <1.0 (7)
However,
f1: The focal length of the first lens group.
１．０ ＜ ｆ１／｜ｆ２｜ ＜ １．５ ・・・（８） The optical system according to any one of claims 1 to 5, wherein the first lens group and the second lens group satisfy the following condition.
1.0 <f1 / | f2 | <1.5 (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015028904A JP6609412B2 (en) | 2015-02-17 | 2015-02-17 | Optical system and imaging apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015028904A JP6609412B2 (en) | 2015-02-17 | 2015-02-17 | Optical system and imaging apparatus |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2016151663A JP2016151663A (en) | 2016-08-22 |
| JP2016151663A5 true JP2016151663A5 (en) | 2018-02-08 |
| JP6609412B2 JP6609412B2 (en) | 2019-11-20 |
Family
ID=56695363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2015028904A Expired - Fee Related JP6609412B2 (en) | 2015-02-17 | 2015-02-17 | Optical system and imaging apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6609412B2 (en) |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59147314A (en) * | 1983-02-12 | 1984-08-23 | Minolta Camera Co Ltd | Zoom lens system |
| JPH0453915A (en) * | 1990-06-22 | 1992-02-21 | Minolta Camera Co Ltd | Zoom lens |
| JPH05273467A (en) * | 1992-03-25 | 1993-10-22 | Nikon Corp | Inner focus type zoom lens |
| JP2988164B2 (en) * | 1992-11-06 | 1999-12-06 | キヤノン株式会社 | Rear focus zoom lens |
| JP3487457B2 (en) * | 1995-01-27 | 2004-01-19 | リコー光学株式会社 | Projection zoom lens |
| JPH08220438A (en) * | 1995-02-17 | 1996-08-30 | Nikon Corp | Zoom lens that can focus at close range |
| JP3505099B2 (en) * | 1999-02-04 | 2004-03-08 | ペンタックス株式会社 | Medium telephoto lens |
| JP5082431B2 (en) * | 2006-12-25 | 2012-11-28 | 株式会社ニコン | Magnification optical system having image stabilization function, imaging device, and magnifying method |
| JP4911689B2 (en) * | 2006-09-12 | 2012-04-04 | オリンパスイメージング株式会社 | Zoom lens |
| JP4845993B2 (en) * | 2009-04-22 | 2011-12-28 | キヤノン株式会社 | Zoom lens and optical apparatus having the same |
| JP5963040B2 (en) * | 2012-03-19 | 2016-08-03 | 株式会社リコー | Imaging lens, imaging device, and information device |
| JP2014109700A (en) * | 2012-12-03 | 2014-06-12 | Canon Inc | Image capturing optical system and image capturing device having the same |
| JP2015068910A (en) * | 2013-09-27 | 2015-04-13 | ソニー株式会社 | Imaging lens and imaging apparatus |
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2015
- 2015-02-17 JP JP2015028904A patent/JP6609412B2/en not_active Expired - Fee Related