JP2003329933A5 - - Google Patents

Claims (10)

In order from the object side, there are a first lens group having a positive refractive power, a negative second lens group , a negative third lens group, and a subsequent group constituted by a plurality of or one lens group. performs focusing by the third lens unit, and corrects the blur of the imaging screen that occurs when moving at least one lens unit iS in a direction perpendicular to the optical axis optical science system vibrates, the entire system at the wide angle end the focal length fw, when the focal length of the lens unit iS and fis, features and to Luz Murenzu that satisfies the following conditional expression.
1.0 <| fis | / fw <4 A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, a fourth lens group having a positive refractive power, and a first lens group having a negative refractive power in order from the object side . fifth lens group has a sixth lens unit having positive refractive power, with performing the focusing on the close range object at the third lens group, optical science system is moved in the direction perpendicular to the fifth lens group and the optical axis There corrects blurring of imaging screen that occurs when the vibration, when the focal length of the entire system at the wide angle end fw, the focal length of the fifth lens group has a f 5, and satisfies the following condition to Luz Murenzu.
1.5 <| f5 | / fw <4 During zooming from the wide-angle end to the telephoto end, the distance between the first lens group and the second lens group increases, the distance between the second lens group and the third lens group increases, and the fourth lens group 3. The zoom lens according to claim 2 , wherein a change in a distance between the first lens unit and the fifth lens unit is increased or constant. When the focal length of the second lens group is f 2 , the focal length of the entire system at the wide-angle end is fw, and the focal length of the entire system at the telephoto end is ft,
The zoom lens according to claim 2 or 3 , wherein the following condition is satisfied. When D23t the distance from the surface vertex on the most image side of the second lens group to a surface apex on the most object side of the third lens group at the telephoto end, the focal length of the entire system that put the wide angle end was fw,
The zoom lens according to claim 2, wherein the following condition is satisfied. When the focal length of the fourth lens group is f4 and the focal length of the entire system at the telephoto end is ft,
0.05 <f4 / ft <0.2
'S Murenzu according to any one of claims 2 to 5, characterized by satisfying the following condition. The third lens group is a positive lens,'s Murenzu according to any one of claims 2 to 6, characterized in that a negative lens of the cemented lens. The fifth lens group is at least a positive lens,'s Murenzu according to any one of claims 2 to 7, characterized in that it has a cemented lens consisting of a negative lens. The second lens is a zoom lens according to any one of claims 2 to 8, characterized in that it comprises an aspheric lens. The sixth lens's Murenzu according to any one of claims 2 to 9, characterized in that it comprises an aspheric lens.