JP2006284753A5 - - Google Patents

Claims (13)

In order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power and a fourth lens unit having positive refractive power, the 4 In zoom lenses that perform zooming by moving two lens groups,
The first lens group comprises one lens component,
During zooming from the wide-angle end to the telephoto end, the second lens unit moves along a locus convex toward the image side,
The distance between the first lens group and the second lens group is wider at the telephoto end than at the wide angle end, and the distance between the second lens group and the third lens group is narrowed,
The amount of movement of the first lens group and the second lens group associated with zooming from the wide-angle end to the telephoto end is m1 and m2, respectively, and the lateral magnifications at the wide-angle end and the telephoto end of the second lens group are β2w and β2t, respectively. When the lateral magnifications at the wide-angle end and the telephoto end of the third lens group are β3w and β3t, respectively.
| M2 / m1 | <0.15
1.75 <β2T / β2w <2.30
1.2 <(β2w · β3t) / (β2t · β3w) <2.0
A zoom lens that satisfies the following conditions. When the distance from the most object side lens surface vertex of the third lens group to the most image surface side lens surface vertex is d3, and the focal length of the entire system at the wide angle end is fw,
0.50 <d3 / fw <0.75
The zoom lens according to claim 1, wherein the following condition is satisfied. In order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power and a fourth lens unit having positive refractive power, the 4 In zoom lenses that perform zooming by moving two lens groups,
The first lens group comprises one lens component,
During zooming from the wide-angle end to the telephoto end, the second lens unit moves along a locus convex toward the image side,
The distance between the first lens group and the second lens group is wider at the telephoto end than at the wide angle end, and the distance between the second lens group and the third lens group is narrowed,
The amount of movement of the first lens group and the second lens group associated with zooming from the wide-angle end to the telephoto end is m1 and m2, respectively, and the lateral magnifications at the wide-angle end and the telephoto end of the second lens group are β2w and β2t, respectively. The lateral magnifications at the wide-angle end and the telephoto end of the third lens group are β3w and β3t, respectively, the distance from the most object-side lens surface vertex to the most image-side vertex of the third lens group is d3, and the wide-angle end Where fw is the focal length of the entire system at
| M2 / m1 | <0.15
1.2 <(β2w · β3t) / (β2t · β3w) <2.0
0.50 <d3 / fw <0.75
A zoom lens that satisfies the following conditions.   4. The zoom lens according to claim 1, wherein one lens component of the first lens group is one positive lens. 5.   4. The zoom according to claim 1, wherein one lens component of the first lens group is a cemented lens in which one positive lens and one negative lens are cemented. 5. lens.   The zoom lens according to any one of claims 1 to 5, wherein the second lens group includes an independent lens of two negative lenses and one positive lens.   The zoom lens according to claim 1, wherein focusing is performed by the fourth lens group.   The zoom lens according to any one of claims 1 to 7, wherein the third lens group has one or more aspheric surfaces.   The zoom lens according to claim 1, wherein the fourth lens group has one or more aspheric surfaces. The distance from the vertex of the lens surface closest to the image plane of the second lens group at the wide angle end to the vertex of the lens surface closest to the object side of the third lens group is d23w, and the focal length of the entire system at the wide angle end is fw. and when,
2.0 <d23w / fw <2.7
The zoom lens according to claim 1, wherein the following condition is satisfied.   11. The zoom lens according to claim 1, further comprising a diaphragm that can move integrally with the third lens group. 11.   The zoom lens according to claim 1, wherein an image is formed on a solid-state image sensor.   An optical apparatus comprising: the zoom lens according to claim 1; and a solid-state imaging device that receives an image formed by the zoom lens.