JP2005338740A5

JP2005338740A5 -

Info

Publication number: JP2005338740A5
Application number: JP2004191006A
Authority: JP
Filing date: 2004-06-29
Publication date: 2007-05-31
Anticipated expiration: 2024-06-29

Claims

物体側より順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３と、正の屈折力を有する第４レンズ群Ｇ４を有し、ズーム時に、広角端に対し望遠端で間隔が、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間が拡大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間が縮小し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間が拡大するように、少なくとも第１レンズ群Ｇ１、第２レンズ群Ｇ２、第３レンズ群Ｇ３が光軸上を移動し、第１レンズ群Ｇ１は多くても２枚のレンズで構成され、第２レンズ群Ｇ２は、物体側から順に、負レンズＬ２１、負レンズＬ２２、正レンズＬ２３から構成され、以下の条件式を満足することを特徴とするズームレンズ。
６．４＜Ｌ_W／ｆ_W＜７．４・・・（１）
ただし、Ｌ_W：広角端での全長、
ｆ_W：広角端での全系の焦点距離、
である。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, and a positive refractive power. The zoom lens has a fourth lens group G4. During zooming, the distance between the first lens group G1 and the second lens group G2 is increased at the telephoto end with respect to the wide-angle end, and the second lens group G2 and the third lens group G3 are expanded. At least the first lens group G1, the second lens group G2, and the third lens group G3 move on the optical axis so that the distance between the third lens group G3 and the fourth lens group G4 increases. The first lens group G1 is composed of at most two lenses, and the second lens group G2 is composed of a negative lens L21, a negative lens L22, and a positive lens L23 in order from the object side. A zoom lens characterized by satisfaction.
6.4 <L _W / f _W <7.4 (1)
Where L _W is the total length at the wide-angle end,
f _W : the focal length of the entire system at the wide-angle end,
It is.

物体側より順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３と、正の屈折力を有する第４レンズ群Ｇ４を有し、ズーム時に、広角端に対し望遠端で間隔が、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間が拡大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間が縮小し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間が拡大するように、少なくとも第１レンズ群Ｇ１、第２レンズ群Ｇ２、第３レンズ群Ｇ３が光軸上を移動し、第１レンズ群Ｇ１は多くても２枚のレンズで構成され、第２レンズ群Ｇ２は、物体側から順に、負レンズＬ２１、負レンズＬ２２、正レンズＬ２３から構成され、４倍以上の変倍比を有し、以下の条件式を満足することを特徴とするズームレンズ。
５．８＜ｆ₁／ｆ_W＜８．０・・・（２）
ただし、ｆ_W：広角端での全系の焦点距離、
ｆ₁：第１レンズ群の焦点距離、
である。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, and a positive refractive power. The zoom lens has a fourth lens group G4. During zooming, the distance between the first lens group G1 and the second lens group G2 is increased at the telephoto end with respect to the wide-angle end, and the second lens group G2 and the third lens group G3 are expanded. At least the first lens group G1, the second lens group G2, and the third lens group G3 move on the optical axis so that the distance between the third lens group G3 and the fourth lens group G4 increases. the first lens group G1 is composed of at most two lenses, the second lens unit G2, in order from the object side, a negative lens L21, a negative lens L22, and a positive lens L23, variations of more than four times A zoom lens having a magnification ratio and satisfying the following conditional expression:
5.8 <f ₁ / f _W <8.0 (2)
Where f _{W is} the focal length of the entire system at the wide-angle end,
f ₁ : focal length of the first lens group,
It is.

物体側より順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３と、正の屈折力を有する第４レンズ群Ｇ４を有し、ズーム時に、広角端に対し望遠端で間隔が、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間が拡大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間が縮小し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間が拡大するように、少なくとも第１レンズ群Ｇ１、第２レンズ群Ｇ２、第３レンズ群Ｇ３が光軸上を移動し、第１レンズ群Ｇ１は多くても２枚のレンズで構成され、第２レンズ群Ｇ２は、物体側から順に、負レンズＬ２１、負レンズＬ２２、正レンズＬ２３から構成され、以下の条件式を満足することを特徴とするズームレンズ。
２＜Ｄ_2W／Ｄ_3W＜２．６・・・（３）
ただし、Ｄ_2W：広角端での第２レンズ群−第３レンズ群間隔、
Ｄ_3W：広角端での第３レンズ群−第４レンズ群間隔、
である。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, and a positive refractive power. The zoom lens has a fourth lens group G4. During zooming, the distance between the first lens group G1 and the second lens group G2 is increased at the telephoto end with respect to the wide-angle end, and the second lens group G2 and the third lens group G3 are expanded. At least the first lens group G1, the second lens group G2, and the third lens group G3 move on the optical axis so that the distance between the third lens group G3 and the fourth lens group G4 increases. The first lens group G1 is composed of at most two lenses, and the second lens group G2 is composed of a negative lens L21, a negative lens L22, and a positive lens L23 in order from the object side. A zoom lens characterized by satisfaction.
2 <D _2W / D _3W <2.6 (3)
Where D _{2W is the} distance between the second lens group and the third lens group at the wide-angle end,
D _3W : Third lens group-fourth lens group spacing at the wide-angle end,
It is.

物体側より順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３と、正の屈折力を有する第４レンズ群Ｇ４を有し、ズーム時に、広角端に対し望遠端で間隔が、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間が拡大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間が縮小し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間が拡大するように、少なくとも第１レンズ群Ｇ１、第２レンズ群Ｇ２、第３レンズ群Ｇ３が光軸上を移動し、第１レンズ群Ｇ１は多くても２枚のレンズで構成され、第２レンズ群Ｇ２は、物体側から順に、負レンズＬ２１、負レンズＬ２２、正レンズＬ２３から構成され、以下の条件式を満足することを特徴とするズームレンズ。
３．９９≦（β_2T／β_2W）＊（β_3T／β_3W）＊（β_4T／β_4W）＜１２・・・（４）
１．８＜Ｄ_2W／ｆ_W＜２．８・・・（５）
ただし、β_2T，β_3T，β_4T：それぞれ第２レンズ群、第３レンズ群、第４レンズ群の望遠端での倍率、
β_2W，β_3W，β_4W：それぞれ第２レンズ群、第３レンズ群、第４レンズ群の広角端での倍率、
ｆ_W：広角端での全系の焦点距離、
Ｄ_2W：広角端での第２レンズ群−第３レンズ群間隔、
である。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, and a positive refractive power. The zoom lens has a fourth lens group G4. During zooming, the distance between the first lens group G1 and the second lens group G2 is increased at the telephoto end with respect to the wide-angle end, and the second lens group G2 and the third lens group G3 are expanded. At least the first lens group G1, the second lens group G2, and the third lens group G3 move on the optical axis so that the distance between the third lens group G3 and the fourth lens group G4 increases. The first lens group G1 is composed of at most two lenses, and the second lens group G2 is composed of a negative lens L21, a negative lens L22, and a positive lens L23 in order from the object side. A zoom lens characterized by satisfaction.
3.99 ≦ (β _2T / β _2W ) * (β _3T / β _3W ) * (β _4T / β _4W ) <12 (4)
1.8 <D _2W / f _W <2.8 (5)
Where β _2T , β _3T , β _4T : magnifications at the telephoto end of the second lens group, the third lens group, and the fourth lens group,
β _2W , β _3W , β _4W : magnifications at the wide angle end of the second lens group, the third lens group, and the fourth lens group,
f _W : the focal length of the entire system at the wide-angle end,
D _2W : second lens group-third lens group spacing at the wide-angle end,
It is.

物体側より順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３と、正の屈折力を有する第４レンズ群Ｇ４を有し、ズーム時に、広角端に対し望遠端で間隔が、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間が拡大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間が縮小し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間が拡大するように、少なくとも第１レンズ群Ｇ１、第２レンズ群Ｇ２、第３レンズ群Ｇ３が光軸上を移動し、第１レンズ群Ｇ１は多くても２枚のレンズで構成され、第２レンズ群Ｇ２は、物体側から順に、負メニスカスレンズＬ２１、負メニスカスレンズ又は平凹負レンズＬ２２、正メニスカスレンズＬ２３から構成され、以下の条件式を満足することを特徴とするズームレンズ。
３＜（β_2T／β_2W）＊（β_3T／β_3W）＊（β_4T／β_4W）＜１２・・・（４）
１．１＜｜ｆ₂／ｆ_W｜＜１．８・・・（６）
ただし、ｆ_W：広角端での全系の焦点距離、
ｆ₂：第２レンズ群の焦点距離、
β_2T，β_3T，β_4T：それぞれ第２レンズ群、第３レンズ群、第４レンズ群の望遠端での倍率、
β_2W，β_3W，β_4W：それぞれ第２レンズ群、第３レンズ群、第４レンズ群の広角端での倍率、
である。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, and a positive refractive power. The zoom lens has a fourth lens group G4. During zooming, the distance between the first lens group G1 and the second lens group G2 is increased at the telephoto end with respect to the wide-angle end, and the second lens group G2 and the third lens group G3 are expanded. At least the first lens group G1, the second lens group G2, and the third lens group G3 move on the optical axis so that the distance between the third lens group G3 and the fourth lens group G4 increases. The first lens group G1 includes at most two lenses, and the second lens group G2 includes, in order from the object side, a negative meniscus lens L21, a negative meniscus lens or a plano-concave negative lens L22, and a positive meniscus lens L23. It is configured and satisfies the following conditional expression Zoom lens to be.
3 <(β _2T / β _2W ) * (β _3T / β _3W ) * (β _4T / β _4W ) <12 (4)
1.1 <| f ₂ / f _W | <1.8 (6)
Where f _{W is} the focal length of the entire system at the wide-angle end,
f ₂ : focal length of the second lens group,
β _2T , β _3T , β _4T : magnifications at the telephoto end of the second lens group, the third lens group, and the fourth lens group,
β _2W , β _3W , β _4W : magnifications at the wide angle end of the second lens group, the third lens group, and the fourth lens group,
It is.

物体側より順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３と、正の屈折力を有する第４レンズ群Ｇ４を有し、ズーム時に、広角端に対し望遠端で間隔が、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間が拡大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間が縮小し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間が拡大するように、少なくとも第１レンズ群Ｇ１、第２レンズ群Ｇ２、第３レンズ群Ｇ３が光軸上を移動し、第１レンズ群Ｇ１は多くても２枚のレンズで構成され、第２レンズ群Ｇ２は、物体側から順に、負レンズＬ２１、負レンズＬ２２、正レンズＬ２３から構成され、第２レンズ群Ｇ２の２枚の負レンズの硝材の屈折率が何れも１．８１以上で、かつ、第２レンズ群Ｇ２の正レンズの硝材の屈折率が１．９以上であることを特徴とするズームレンズ。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, and a positive refractive power. The zoom lens has a fourth lens group G4. During zooming, the distance between the first lens group G1 and the second lens group G2 is increased at the telephoto end with respect to the wide-angle end, and the second lens group G2 and the third lens group G3 are expanded. At least the first lens group G1, the second lens group G2, and the third lens group G3 move on the optical axis so that the distance between the third lens group G3 and the fourth lens group G4 increases. The first lens group G1 is composed of at most two lenses, and the second lens group G2 is composed of a negative lens L21, a negative lens L22, and a positive lens L23 in this order from the object side, and the second lens group G2 The refractive index of the glass material of the two negative lenses is 1.81 or more, and The zoom lens positive lens refractive index of the glass material of the second lens group G2 is characterized in that at least 1.9.

物体側より順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３と、正の屈折力を有する第４レンズ群Ｇ４を有し、ズーム時に、広角端に対し望遠端で間隔が、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間が拡大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間が縮小し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間が拡大するように、少なくとも第１レンズ群Ｇ１、第２レンズ群Ｇ２、第３レンズ群Ｇ３が光軸上を移動し、第１レンズ群Ｇ１は多くても２枚のレンズで構成され、第２レンズ群Ｇ２は、物体側から順に、負レンズＬ２１、負レンズＬ２２、正レンズＬ２３から構成され、以下の条件式を満足することを特徴とするズームレンズ。
３＜（β_2T／β_2W）＊（β_3T／β_3W）＊（β_4T／β_4W）＜１２・・・（４）
０．８＜（β_2T／β_2W）／（β_3T／β_3W）＜１．１・・・（７）
ただし、β_2T，β_3T，β_4T：それぞれ第２レンズ群、第３レンズ群、第４レンズ群の望遠端での倍率、
β_2W，β_3W，β_4W：それぞれ第２レンズ群、第３レンズ群、第４レンズ群の広角端での倍率、
である。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, and a positive refractive power. The zoom lens has a fourth lens group G4. During zooming, the distance between the first lens group G1 and the second lens group G2 is increased at the telephoto end with respect to the wide-angle end, and the second lens group G2 and the third lens group G3 are expanded. At least the first lens group G1, the second lens group G2, and the third lens group G3 move on the optical axis so that the distance between the third lens group G3 and the fourth lens group G4 increases. The first lens group G1 is composed of at most two lenses, and the second lens group G2 is composed of a negative lens L21, a negative lens L22, and a positive lens L23 in order from the object side. A zoom lens characterized by satisfaction.
3 <(β _2T / β _2W ) * (β _3T / β _3W ) * (β _4T / β _4W ) <12 (4)
0.8 <(β _2T / β _2W ) / (β _3T / β _3W ) <1.1 (7)
Where β _2T , β _3T , β _4T : magnifications at the telephoto end of the second lens group, the third lens group, and the fourth lens group,
β _2W , β _3W , β _4W : magnifications at the wide angle end of the second lens group, the third lens group, and the fourth lens group,
It is.

物体側より順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３と、正の屈折力を有する第４レンズ群Ｇ４を有し、ズーム時に、広角端に対し望遠端で間隔が、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間が拡大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間が縮小し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間が拡大するように、少なくとも第１レンズ群Ｇ１、第２レンズ群Ｇ２、第３レンズ群Ｇ３が光軸上を移動し、第１レンズ群Ｇ１は多くても２枚のレンズで構成され、第２レンズ群Ｇ２は、物体側から順に、負レンズＬ２１、負レンズＬ２２、正レンズＬ２３から構成され、以下の条件式を満足することを特徴とするズームレンズ。
０．９＜Δ_T3G／ｆ_W ≦１．７２・・・（８）
ただし、Δ_T3G：広角端から望遠端の間での第３レンズ群の移動量、
である。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, and a positive refractive power. The zoom lens has a fourth lens group G4. During zooming, the distance between the first lens group G1 and the second lens group G2 is increased at the telephoto end with respect to the wide-angle end, and the second lens group G2 and the third lens group G3 are expanded. At least the first lens group G1, the second lens group G2, and the third lens group G3 move on the optical axis so that the distance between the third lens group G3 and the fourth lens group G4 increases. The first lens group G1 is composed of at most two lenses, and the second lens group G2 is composed of a negative lens L21, a negative lens L22, and a positive lens L23 in order from the object side. A zoom lens characterized by satisfaction.
0.9 <Δ _T3G / f _W ≦ 1.72 (8)
Where Δ _{T3G is the} amount of movement of the third lens group from the wide-angle end to the telephoto end,
It is.

物体側より順に、正の屈折力を有する第１レンズ群Ｇ１と、負の屈折力を有する第２レンズ群Ｇ２と、正の屈折力を有する第３レンズ群Ｇ３と、正の屈折力を有する第４レンズ群Ｇ４を有し、ズーム時に、広角端に対し望遠端で間隔が、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間が拡大し、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間が縮小し、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間が拡大するように、少なくとも第１レンズ群Ｇ１、第２レンズ群Ｇ２、第３レンズ群Ｇ３が光軸上を移動し、第１レンズ群Ｇ１は多くても２枚のレンズで構成され、第２レンズ群Ｇ２は、物体側から順に、負レンズＬ２１、負レンズＬ２２、正レンズＬ２３から構成され、以下の条件式を満足することを特徴とするズームレンズ。
１．２＜ｆ₃／ｆ_W＜１．８５・・・（９）
ただし、ｆ_W：広角端での全系の焦点距離、
ｆ₃：第３レンズ群の焦点距離、
である。 In order from the object side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, and a positive refractive power. The zoom lens has a fourth lens group G4. During zooming, the distance between the first lens group G1 and the second lens group G2 is increased at the telephoto end with respect to the wide-angle end, and the second lens group G2 and the third lens group G3 are expanded. At least the first lens group G1, the second lens group G2, and the third lens group G3 move on the optical axis so that the distance between the third lens group G3 and the fourth lens group G4 increases. The first lens group G1 is composed of at most two lenses, and the second lens group G2 is composed of a negative lens L21, a negative lens L22, and a positive lens L23 in order from the object side. A zoom lens characterized by satisfaction.
1.2 <f ₃ / f _W <1.85 (9)
Where f _{W is} the focal length of the entire system at the wide-angle end,
f ₃ : focal length of the third lens group,
It is.

請求項１から９の何れか１項記載のズームレンズと、その像側に配置された撮像素子とを備えていることを特徴とする撮像装置。 An image pickup apparatus comprising: the zoom lens according to claim 1; and an image pickup element disposed on an image side thereof.