| US 7,586,683 B2 | ||
| Zoom lens, still image camera comprising the zoom lens, and video camera comprising the zoom lens | ||
| Katsu Yamada, Matsubara (Japan); and Shusuke Ono, Takatsuki (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Dec. 20, 2007, as Appl. No. 12/5,077. | ||
| Application 12/005077 is a division of application No. 11/067432, filed on Feb. 22, 2005, granted, now 7,336,419. | ||
| Application 11/067432 is a continuation in part of application No. 09/701754, abandoned, previously published as PCT/JP99/02910, filed on May 31, 1999. | ||
| Claims priority of application No. 10-151361 (JP), filed on Jun. 01, 1998; application No. 10-302109 (JP), filed on Oct. 23, 1998; and application No. 11-108482 (JP), filed on Apr. 15, 1999. | ||
| Prior Publication US 2008/0106790 A1, May 08, 2008 | ||
| Int. Cl. G02B 27/64 (2006.01) | ||
| U.S. Cl. 359—557 [359/765; 359/766] | 57 Claims |
| 20. A zoom lens comprising:
a first lens group having a positive refracting power and being fixed with respect to an image plane;
a second lens group having a negative refracting power and being movable along an optical axis to vary a power;
a third lens group being fixed with respect to the image plane;
a fourth lens group being fixed with respect to the image plane; and
a fifth lens group having a positive refracting power and being movable along an optical axis;
wherein said first, second, third, fourth and fifth lens groups are disposed in this order from an object side;
wherein said third lens group and said fourth lens group compose a combination of a lens group having a positive refracting
power and a lens group having a negative refracting power,
wherein one of said third and fourth lens group is vertically movable with respect to the optical axis; and
wherein the one of said third and fourth lens groups vertically movable with respect to the optical axis comprises a convex
lens having an aspherical surface when viewed from the object side and a local radius of curvature rS1 for a diameter occupying
10% of a lens effective diameter and a local radius of curvature rS9 for a diameter occupying 90% of a lens effective diameter
satisfing the following conditional expression
0.0<rS1 /rs9<2.00.
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