JP2005084409A5 - - Google Patents
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- JP2005084409A5 JP2005084409A5 JP2003317007A JP2003317007A JP2005084409A5 JP 2005084409 A5 JP2005084409 A5 JP 2005084409A5 JP 2003317007 A JP2003317007 A JP 2003317007A JP 2003317007 A JP2003317007 A JP 2003317007A JP 2005084409 A5 JP2005084409 A5 JP 2005084409A5
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Claims (14)
変倍時に固定の正の屈折力を有する第１レンズ群と、
変倍時に可動の負の屈折力を有する第２レンズ群と、
変倍に伴う像面の変動を補正する第３レンズ群と、
変倍時に固定の正の屈折力を有する第４レンズ群と
を備え、
前記第２レンズ群は、
６枚以上のレンズで構成され、最も物体側に、物体側に凸面を向けた凹メニスカスレンズが配置され、かつ、以下の条件式（１）を満足するように構成されている
ことを特徴とする広角ズームレンズ。
ＮｄG21＞１．９ ……（１）
ただし、
ＮｄG21：第２レンズ群における最も物体側のレンズのｄ線に対する屈折率 From the object side,
A first lens group having a fixed positive refractive power upon zooming;
A second lens group having negative refractive power that is movable at the time of zooming;
A third lens group that to correct the image plane variation accompanied by zooming,
A fourth lens group having a fixed positive refractive power at the time of zooming,
The second lens group includes:
It is composed of six or more lenses, and a concave meniscus lens having a convex surface facing the object side is disposed closest to the object side, and is configured to satisfy the following conditional expression (1): Wide angle zoom lens.
Nd G21 > 1.9 (1)
However,
Nd G21 : Refractive index with respect to d-line of the lens closest to the object side in the second lens group
ことを特徴とする請求項１に記載の広角ズームレンズ。
ＮｄG21＞２．０ ……（２） The wide-angle zoom lens according to claim 1, further configured to satisfy the following conditional expression (2):
Nd G21 > 2.0 (2)
物体側に凸面を向けた凹メニスカスレンズからなる第１レンズと、
凹レンズからなる第２レンズと、
凸レンズからなる第３レンズおよび凹レンズからなる第４レンズで構成され、物体側に凹面を向けた接合面を持つ接合レンズと、
凸レンズからなる第５レンズと、
凹レンズからなる第６レンズとの６枚のレンズで構成されている
ことを特徴とする請求項１または２に記載の広角ズームレンズ。 The second lens group is in order from the object side.
A first lens composed of a concave meniscus lens having a convex surface facing the object side;
A second lens comprising a concave lens;
A cemented lens having a cemented surface with a concave surface facing the object side, which includes a third lens composed of a convex lens and a fourth lens composed of a concave lens;
A fifth lens comprising a convex lens;
The wide-angle zoom lens according to claim 1, wherein the wide-angle zoom lens is configured by six lenses including a sixth lens made of a concave lens.
ことを特徴とする請求項３に記載の広角ズームレンズ。
−１．７５＜Ｒａ／Ｅａ＜−１．０５ ……（３）
ただし、
Ｒａ：第２レンズ群における接合レンズの接合面の曲率半径
Ｅａ：第２レンズ群における接合レンズの接合面の有効半径 The wide-angle zoom lens according to claim 3, wherein the second lens group is configured to satisfy the following conditional expression (3) with respect to a cemented surface of the cemented lens in the second lens group.
−1.75 <Ra / Ea <−1.05 (3)
However,
Ra: radius of curvature of the cemented lens surface in the second lens group Ea: effective radius of the cemented lens surface in the second lens group
変倍時に固定の正の屈折力を有する第１レンズ群と、
変倍時に可動の負の屈折力を有する第２レンズ群と、
変倍に伴う像面の変動を補正する第３レンズ群と、
変倍時に固定の正の屈折力を有する第４レンズ群と
を備え、
前記第３レンズ群が、
物体側に凹面を向けた凸メニスカスレンズと凹レンズとからなる接合レンズのみで構成されている
ことを特徴とする広角ズームレンズ。 From the object side,
A first lens group having a fixed positive refractive power upon zooming;
A second lens group having negative refractive power that is movable at the time of zooming;
A third lens group that to correct the image plane variation accompanied by zooming,
A fourth lens group having a fixed positive refractive power at the time of zooming,
The third lens group is
A wide-angle zoom lens comprising only a cemented lens composed of a convex meniscus lens having a concave surface facing the object side and a concave lens.
ことを特徴とする請求項５に記載の広角ズームレンズ。
ＮｄG31＞１．７５ ……（４）
ただし、
ＮｄG31：第３レンズ群における凸メニスカスレンズのｄ線に対する屈折率 The wide-angle zoom lens according to claim 5, wherein the convex meniscus lens in the third lens group is configured to satisfy the following conditional expression (4).
Nd G31 > 1.75 (4)
However,
Nd G31 : Refractive index with respect to d-line of the convex meniscus lens in the third lens group
ことを特徴とする請求項５または６に記載の広角ズームレンズ。
−５．２＜ＲG31／ｆｗ＜−２．２ ……（５）
ただし、
ＲG31：第３レンズ群の最も物体側の面の曲率半径
ｆｗ：広角端における全系の焦点距離 The wide-angle zoom lens according to claim 5 or 6, further configured to satisfy the following conditional expression (5).
-5.2 <R G31 /fw<-2.2 (5)
However,
R G31 : radius of curvature of the surface of the third lens unit closest to the object side fw: focal length of the entire system at the wide angle end
変倍時に固定の正の屈折力を有する第１レンズ群と、
変倍時に可動の負の屈折力を有する第２レンズ群と、
変倍に伴う像面の変動を補正する第３レンズ群と、
変倍時に固定の正の屈折力を有する第４レンズ群と
を備え、
前記第２レンズ群が、
６枚以上のレンズで構成され、最も物体側に、物体側に凸面を向けた凹メニスカスレンズが配置された構成となっており、
前記第３レンズ群が、
物体側に凹面を向けた凸メニスカスレンズと凹レンズとからなる接合レンズのみで構成されている
ことを特徴とする広角ズームレンズ。 From the object side,
A first lens group having a fixed positive refractive power upon zooming;
A second lens group having negative refractive power that is movable at the time of zooming;
A third lens group that to correct the image plane variation accompanied by zooming,
A fourth lens group having a fixed positive refractive power at the time of zooming,
The second lens group is
It is composed of six or more lenses, and a concave meniscus lens with a convex surface facing the object side is arranged on the most object side,
The third lens group is
A wide-angle zoom lens comprising only a cemented lens composed of a convex meniscus lens having a concave surface facing the object side and a concave lens.
ことを特徴とする請求項８に記載の広角ズームレンズ。
ＮｄG21＞１．９ ……（１）
ただし、
ＮｄG21：第２レンズ群における最も物体側のレンズのｄ線に対する屈折率 The wide-angle zoom lens according to claim 8, wherein the second lens group is configured to satisfy the following conditional expression (1).
Nd G21 > 1.9 (1)
However,
Nd G21 : Refractive index with respect to d-line of the lens closest to the object side in the second lens group
ことを特徴とする請求項８に記載の広角ズームレンズ。
ＮｄG21＞２．０ ……（２）
ただし、
ＮｄG21：第２レンズ群における最も物体側のレンズのｄ線に対する屈折率 The wide-angle zoom lens according to claim 8, wherein the second lens group is configured to satisfy the following conditional expression (2).
Nd G21 > 2.0 (2)
However,
Nd G21 : Refractive index with respect to d-line of the lens closest to the object side in the second lens group
物体側に凸面を向けた凹メニスカスレンズからなる第１レンズと、
凹レンズからなる第２レンズと、
凸レンズからなる第３レンズおよび凹レンズからなる第４レンズで構成され、物体側に凹面を向けた接合面を持つ接合レンズと、
凸レンズからなる第５レンズと、
凹レンズからなる第６レンズとの６枚のレンズで構成されている
ことを特徴とする請求項８ないし１０のいずれか１項に記載の広角ズームレンズ。 The second lens group is in order from the object side.
A first lens composed of a concave meniscus lens having a convex surface facing the object side;
A second lens comprising a concave lens;
A cemented lens having a cemented surface with a concave surface facing the object side, which includes a third lens composed of a convex lens and a fourth lens composed of a concave lens;
A fifth lens comprising a convex lens;
The wide-angle zoom lens according to any one of claims 8 to 10, wherein the wide-angle zoom lens includes six lenses including a sixth lens made of a concave lens.
ことを特徴とする請求項１１に記載の広角ズームレンズ。
−１．７５＜Ｒａ／Ｅａ＜−１．０５ ……（３）
ただし、
Ｒａ：第２レンズ群における接合レンズの接合面の曲率半径
Ｅａ：第２レンズ群における接合レンズの接合面の有効半径 The wide-angle zoom lens according to claim 11, wherein the second lens group is configured to satisfy the following conditional expression (3) with respect to a cemented surface of the cemented lens in the second lens group.
−1.75 <Ra / Ea <−1.05 (3)
However,
Ra: radius of curvature of the cemented lens surface in the second lens group Ea: effective radius of the cemented lens surface in the second lens group
ことを特徴とする請求項８ないし１２のいずれか１項に記載の広角ズームレンズ。
ＮｄG31＞１．７５ ……（４）
ただし、
ＮｄG31：第３レンズ群における凸メニスカスレンズのｄ線に対する屈折率 The wide-angle zoom lens according to any one of claims 8 to 12, wherein the convex meniscus lens in the third lens group is configured to satisfy the following conditional expression (4).
Nd G31 > 1.75 (4)
However,
Nd G31 : Refractive index with respect to d-line of the convex meniscus lens in the third lens group
ことを特徴とする請求項８ないし１３のいずれか１項に記載の広角ズームレンズ。
−５．２＜ＲG31／ｆｗ＜−２．２ ……（５）
ただし、
ＲG31：第３レンズ群の最も物体側の面の曲率半径
ｆｗ：広角端における全系の焦点距離
The wide angle zoom lens according to any one of claims 8 to 13, further configured to satisfy the following conditional expression (5).
-5.2 <R G31 /fw<-2.2 (5)
However,
R G31 : radius of curvature of the surface of the third lens unit closest to the object side fw: focal length of the entire system at the wide angle end
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003317007A JP4405212B2 (en) | 2003-09-09 | 2003-09-09 | Wide angle zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003317007A JP4405212B2 (en) | 2003-09-09 | 2003-09-09 | Wide angle zoom lens |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2005084409A JP2005084409A (en) | 2005-03-31 |
| JP2005084409A5 true JP2005084409A5 (en) | 2006-06-15 |
| JP4405212B2 JP4405212B2 (en) | 2010-01-27 |
Family
ID=34416731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003317007A Expired - Lifetime JP4405212B2 (en) | 2003-09-09 | 2003-09-09 | Wide angle zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4405212B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8477429B2 (en) | 2009-01-19 | 2013-07-02 | Canon Kabushiki Kaisha | Zoom lens system and image pickup apparatus including the same |
| JP5588824B2 (en) * | 2009-10-30 | 2014-09-10 | 日東光学株式会社 | Lens system |
| CN101930114B (en) * | 2010-08-25 | 2012-09-05 | 福建福光数码科技有限公司 | Varifocal pick-up lens with high resolution and strong fog penetrating function |
| CN103403603B (en) | 2010-12-16 | 2015-09-09 | 富士胶片株式会社 | Zoom lens and imaging device |
| JP5759209B2 (en) * | 2011-03-04 | 2015-08-05 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| WO2013031205A1 (en) * | 2011-08-30 | 2013-03-07 | 富士フイルム株式会社 | Variable magnification optical system and image-capturing device |
| CN103765288B (en) * | 2011-08-30 | 2016-09-28 | 富士胶片株式会社 | Variable magnification optical system and imaging device |
-
2003
- 2003-09-09 JP JP2003317007A patent/JP4405212B2/en not_active Expired - Lifetime