JP2006227526A5 - - Google Patents

Claims (13)

  A lens group B including an anti-vibration lens group that moves so as to have a component in a direction perpendicular to the optical axis and changes the image position; A zoom lens having a group A, and the distance between the lens group A and the lens group B is changed during zooming, and the lens group A is composed of at least three positive lens components and has at least one aspherical shape. A zoom lens comprising a lens surface.   2. The zoom lens according to claim 1, wherein the distance between the lens group A and the lens group B is larger at the telephoto end than at the wide angle end. The anti-vibration lens group and the lens group B both have a negative refractive power, and a lens group C having a positive refractive power is disposed on the image side of the lens group B, and is at the telephoto end compared to the wide-angle end. The distance between the lens group B and the lens group C is reduced, the lateral magnification of the image stabilizing lens group at the telephoto end is βist, and the lateral magnification of the optical system located on the image side from the image stabilizing lens group at the telephoto end 1.0 <| (1-βist) × βrt | <2.0
The zoom lens according to claim 1 or 2, wherein the following condition is satisfied. The focal length of the entire system at the telephoto end is ft, the focal length of the anti-vibration lens group is fis, the focal length of the lens group B is fb, and the radius of curvature of the most object-side surface of the anti-vibration lens group is Ris1. When 0.3 <| fis | / ft <0.7
0.15 <| fb | / ft <0.45
0.3 <| Ris1 | / ft
4. The zoom lens according to claim 1, wherein the zoom lens satisfies the following condition. When the focal length of the entire system at the telephoto end is ft and the focal length of the lens group A is fa, 0.15 <fa / ft <0.3
The zoom lens according to claim 1, wherein the following condition is satisfied. On the object side of the lens group A, a first lens group having a positive refractive power and a second lens group having a negative refractive power are disposed in order from the object side to the image side. Is provided with a lens unit C having a positive refractive power, and the distance between the first lens unit and the second lens unit at the telephoto end is larger than that at the wide-angle end, and the second lens unit and the lens unit A are the spacing smaller, first, 0.5 when the focal length of the second lens group respectively f1, f2, the focal length of the lens group C f c, the focal length of the entire system at the telephoto end and ft < f1 / ft <1.3
0.05 <| f2 | / ft <0.2
0.25 <fc / ft <0.7
The zoom lens according to claim 1, wherein the following condition is satisfied. In order from the object side to the image side, 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, a fourth lens group having a negative refractive power, and a positive lens group a fifth lens group having a refractive power, the fourth lens group has a vibration reduction lens group for changing an image position by moving so as to have a component perpendicular to the optical axis direction, the telephoto end than at the wide-angle end Thus, the distance between the first lens group and the second lens group is large, the distance between the second lens group and the third lens group is small, the distance between the third lens group and the fourth lens group is large, and the fourth lens group is large. In a zoom lens in which the distance between the lens group and the fifth lens group is small, the third lens group has at least three positive lens components and at least one aspherical lens surface, and the image stabilizing lens group at the telephoto end. Is located on the image side from the image stabilizing lens group at the telephoto end. 1.0 When the Betart the lateral magnification of the academic system <| (1-βist) × βrt | <2.0
A zoom lens characterized by satisfying the following conditions:   The fourth lens group includes an anti-vibration lens group that moves so as to have a component perpendicular to the optical axis and changes the image position, and a sub-lens group that changes an interval between the anti-vibration lens group during zooming. The zoom lens according to claim 7. The focal length of the fourth lens group at the telephoto end is f4t, the focal length of the anti-vibration lens group is fis, the focal length of the entire system at the telephoto end is ft, and the radius of curvature of the most object-side surface of the anti-vibration lens group is When Ris1 is 0.3 <| fis | / ft <0.7
0.15 <| f4t | / ft <0.45
0.3 <| Ris1 | / ft
The zoom lens according to claim 8, wherein the following condition is satisfied. 0.15 <f3 / ft <0.3 where f3 is the focal length of the third lens group and ft is the focal length of the entire system at the telephoto end.
The zoom lens according to claim 7, 8 or 9, wherein the following condition is satisfied. When the focal lengths of the first , second , and fifth lens groups are sequentially f1 , f2 , and f5, and the focal length of the entire system at the telephoto end is ft, 0.5 <f1 / ft <1.3.
0.05 <| f2 | / ft <0.2
0.25 <f5 / ft <0.7
The zoom lens according to claim 7, wherein the following condition is satisfied. Any one of the zoom lens according to claim 1 to 11, characterized by forming an image on a solid-state image element.   An image pickup apparatus comprising: the zooming according to any one of claims 1 to 12; and a solid-state image sensor that receives an image formed by the zoom lens.