| US 7,548,380 B2 | ||
| Zoom lens | ||
| Jin Moung Jeong, Seongnam-si (Korea, Republic of) | ||
| Assigned to LG Innotek Co., Ltd., Seoul (Korea, Republic of) | ||
| Filed on Nov. 21, 2007, as Appl. No. 11/944,033. | ||
| Claims priority of application No. 10-2006-0115640 (KR), filed on Nov. 22, 2006. | ||
| Prior Publication US 2008/0117529 A1, May 22, 2008 | ||
| Int. Cl. G02B 15/14 (2006.01) | ||
| U.S. Cl. 359—691 [359/680; 359/694] | 17 Claims |
| 1. A zoom lens comprising:
a first lens group located adjacent to a object side and having a total negative refractive power; and
a second lens group located adjacent to a image side and having a total positive refractive power,
wherein zooming occurs as a interval between the first lens group ad the second lens group is varied,
wherein the zoom lens satisfies
 where f1 denotes a focal distance of the first lens group, and Zr denotes a ratio of a focal distance at a telephoto position to a
focal distance at a wide angle position (ft/fw),
wherein the first lens group comprises, sequentially from the object side to the image side: a first lens and a second lens,
wherein the second lens group comprises, from the object side to the image side: an iris, a third lens, a fourth lens, a fifth
lens, and a sixth lens,
wherein at least one surface of the fourth lens is an aspheric surface.
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