Sony Corporation

Masaki Maruyama

Masaharu Hosoi

Hiroyuki Matsumoto

Hiroshi Koizumi

Toshihiro Sunaga

Makoto Kanai

Motoyuki Otake

An imaging lens and imaging apparatus are disclosed. In one example, an imaging lens includes a first lens group having positive refractive power, a second lens group having a positive refractive power, and a third lens group having positive or negative refractive power, the first lens group being fixed with respect to an image plane, the second lens group traveling along an optical axis to the object side, and the third lens group being fixed with respect to the image plane. The first lens group may include two positive lenses and a negative lens. The second lens group may include a second a-lens component having negative refractive power and a second b-lens component having positive refractive power. The third lens group may include a third a-lens component having positive refractive power and a third b-lens component having negative refractive power.

Imaging lens and imaging apparatus

A zoom lens includes, in order from an object side to an image side: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group having a negative refractive power; and a fifth lens group having a negative refractive power. During zooming from a wide-angle end state to a telephoto end state, air spacing between the first and second lens groups increases, air spacing between the second and third lens groups decreases, spacing between the third and fourth lens groups changes, and spacing between the fourth and fifth lens groups changes. Thus, all the lens groups are moved in an optical axis direction. The zoom lens satisfies the following Conditional Expression (1).1.0&#x3c;&#x3b2;5&#x2266;4.0&#x2003;&#x2003;(1) Here, &#x3b2;5w is a lateral magnification of the fifth lens group at a wide-angle end.

Zoom lens and imaging apparatus

A zoom lens includes: first, second, third and fourth lens groups having negative power, positive power, negative power and positive power, respectively, and sequentially arranged from an object side toward an image side. When the magnification at a wide angle side is changed to the magnification at a telescopic side, the first lens group is so moved along an optical axis that the distance between the first lens group and the second lens group decreases, and the second third and fourth lens groups are moved from the image side toward the object side, the third lens group is moved along the optical axis for focusing, and the zoom lens satisfies the following conditional expression (1)&#x2212;2.0&#x3c;3/&#x221a;()&#x3c;&#x2212;0.3&#x2003;&#x2003;(1)where f3, fw and ft represent the focal lengths of the third lens group, the entire lens system at the wide angle end, and the entire lens system at the telescopic end, respectively.

Disclosed herein is a zoom lens including a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, and a fifth lens group having negative refractive power. The respective lens groups move in magnification variation from a wide angle end to a telephoto end. The fourth lens group is moved in optical axis direction to correct variation of an imaging position in association with magnification variation and perform correction of the imaging position in association with object distance change. Condition expression (1) is satisfied.0.60&#x3c;1/()&#x3c;1.10&#x2003;&#x2003;(1),where

Growing community of inventors

Chiba, Japan

Masaki Maruyama