Zoom lens and image pickup apparatus using the same
AssigneeOlympus Corporation
InventorKazuteru Kawamura
Life of this patent
Estimating the term…
Abstract
The zoom lens has an aperture stop arranged between the second lens unit and the fourth lens unit. During zooming from the wide angle end to the telephoto end, the distances between the lens units vary in such a way that the distance between the first lens unit and the second lens unit is larger at the telephoto end than at the wide angle end, the distance between the second lens unit and the third lens unit is smaller at the telephoto end than at the wide angle end, and the distance between the fourth lens unit and the fifth lens unit is larger at the telephoto end than at the wide angle end. The zoom lens satisfies the following conditional expression (1): 3.5≤LTLw/IHt≤8.9 (1).
Claims60
A zoom lens comprising, in order from the object side to the image 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;
- a fourth lens unit having a negative refractive power;
- and
- a fifth lens unit having a positive refractive power,
- wherein the zoom lens has an aperture stop arranged between the second lens unit and the fourth lens unit,
- during zooming from the wide angle end to the telephoto end, the distances between the lens units vary in such a way that the distance between the first lens unit and the second lens unit is larger at the telephoto end than at the wide angle end, the distance between the second lens unit and the third lens unit is smaller at the telephoto end than at the wide angle end, and the distance between the fourth lens unit and the fifth lens unit is larger at the telephoto end than at the wide angle end,
- the third lens unit has three or more lens components, at least one lens component of the third lens unit including a cemented lens that includes a plurality of individual lenses,
- only any one of the lens components is shifted in a direction orthogonal to an optical axis in order to reduce image blur by stabilizing image shift caused by vibration of the zoom lens,
- where the lens component denotes a single lens that is not cemented to any other lens or a cemented lens that includes a plurality of individual lenses.
A zoom lens comprising, in order from the object side to the image 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;
- a fourth lens unit having a negative refractive power;
- and
- a fifth lens unit having a positive refractive power,
- wherein the zoom lens has an aperture stop arranged between the second lens unit and the fourth lens unit,
- during zooming from the wide angle end to the telephoto end, the distances between the lens units vary in such a way that the distance between the first lens unit and the second lens unit is larger at the telephoto end than at the wide angle end, the distance between the second lens unit and the third lens unit is smaller at the telephoto end than at the wide angle end, and the distance between the fourth lens unit and the fifth lens unit is larger at the telephoto end than at the wide angle end,
- the third lens unit has three or more lens components, the lens component closest to the image side in the third lens group is a biconvex cemented lens wherein the lens component closest to the image side is shifted in a direction orthogonal to an optical axis in order to reduce image blur by stabilizing image shift caused by vibration of the zoom lens.
Dependencies are inferred from the claim text.