JP2007072291A5 - - Google Patents

Claims (14)

A first lens group including a reflecting member for deflecting the optical path; a positive refractive power lens group disposed on the image side of the first lens group; and a negative refractive index disposed on the image side of the positive refractive power lens group. is composed of a lens group refractive power, upon zooming from the wide-angle end to the telephoto end, the first lens group and the positive refractive power lens unit interval, and the positive of the negative refractive lens group refractive power A zoom lens in which an interval between the power lens groups is changed, and the lens group having the negative refractive power is a lens group arranged closest to the image side among the lens groups included in the zoom lens; When the focal length of the lens unit having a refractive power of f is fe and the focal length of the entire system at the wide angle end is fw,
0.8 <| fe / fw | <2.5
A zoom lens characterized by satisfying the following conditions: ΒeW the lateral magnification at the wide-angle end of the lens unit of the negative refractive power, when the βeT a lateral magnification at a telephoto end of the lens unit of the negative refractive power,
1.4 <βeT / βeW <3.0
The zoom lens according to claim 1, wherein the following condition is satisfied. The first lens group has a positive meniscus lens on the image side is convex, positive meniscus lens, according to claim 1, characterized in that in said first lens group is the most image side in the lens disposed or 2. The zoom lens according to 2 . The negative lens in which the lens unit has refractive power, the zoom lens according to claim 1, wherein the image-side is only the negative meniscus lens convex. In order from the object side to the image side, the first lens group having a positive or negative refractive power, the second lens group having a negative refractive power, the third lens group which is a lens group having the positive refractive power, and the negative refraction. Only the four lens groups of the fourth lens group, which is a power lens group, are provided as lens groups, and during zooming from the wide-angle end to the telephoto end, the distance between the first lens group and the second lens group, the second lens group group and spacing of the third lens group, a zoom lens according to any of claims 1 to 4 wherein the distance between the third lens group and the fourth lens group and said changing. In order from the object side to the image side, the first lens group having a negative refractive power, the second lens group having a positive or negative refractive power, the third lens group that is a lens group having the positive refractive power, and the negative refraction. Only the four lens groups of the fourth lens group, which is a power lens group, are provided as lens groups, and during zooming from the wide-angle end to the telephoto end, the distance between the first lens group and the second lens group, the second lens group group and spacing of the third lens group, a zoom lens according to any of claims 1 to 4 wherein the distance between the third lens group and the fourth lens group and said changing. In order from the object side to the image side, the first lens group having a negative refractive power, the second lens group being a lens group having a positive refractive power, and the third lens group being a lens group having a negative refractive power. It has only one lens group as a lens group, and the distance between the first lens group and the second lens group and the distance between the second lens group and the third lens group change during zooming from the wide-angle end to the telephoto end. The zoom lens according to claim 1, wherein: In order from the object side to the image side, a first lens unit having a positive or negative refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, fourth lens unit having a negative refractive power In the zooming from the wide-angle end to the telephoto end, the distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group, the distance between the third lens group and the fourth lens group 2. A zoom lens according to claim 1, wherein the first lens group includes a positive refractive power component and a reflecting member that deflects the optical path. When the focal length of the fourth lens group is fe and the focal length of the entire system at the wide angle end is fw,
0.8 <| fe / fw | <2.5
The zoom lens according to claim 8 , wherein the following condition is satisfied. ΒeW lateral magnification at the wide angle end of the fourth lens group, when the βeT a lateral magnification at a telephoto end of said fourth lens group,
1.4 <βeT / βeW <3.0
The zoom lens according to claim 8 or 9, wherein the following condition is satisfied. The first lens group has a positive meniscus lens on the image side is convex, positive meniscus lens 8 through claim, wherein the is arranged a lens closest to the image side in the first in first lens group The zoom lens according to any one of 10 . The zoom lens according to any one of claims 8 to 11, wherein the lens included in the fourth lens group is only a negative meniscus lens having a convex surface on the image side. The zoom lens according to any one of claims 1 to 12, wherein the system forms an image on the solid-state imaging device. An image pickup apparatus comprising: the zoom lens according to claim 1 ; and a solid-state image pickup device that receives an image formed by the zoom lens.