Olympus Imaging Corporation

Akiko Naito

Tomoyuki Satori

Tetsuya Yanai

Minoru Ueda

Akinori Nishio

Mayu Miki

Takeshi Hosoya

A zoom lens comprises in order from an object side, a first lens unit, a second lens unit, a third lens unit, a fourth lens unit, and a fifth lens unit having, respectively, a positive, negative, positive, negative, and positive refractive power. At the time of zooming from a wide angle end to a telephoto end, the first, third, and fourth lens units move toward the object side. A distance between the first and second lens units increase, a distance between the second and third lens units decrease, a distance between the third lens unit and the fourth lens unit changes, and a distance between the fourth lens unit and the fifth lens unit increases. The zoom lens satisfies the following expressions:1.54&#x3c;&#x3b2;/&#x3b2;&#x3c;3.0&#x2003;&#x2003;(1a)1.0&#x3c;&#x3b2;/&#x3b2;&#x3c;5.0&#x2003;&#x2003;(2)1.0&#x3c;&#x3b2;/&#x3b2;&#x3c;3.0&#x2003;&#x2003;(3).

Growing community of inventors

Hachioji, Japan

Akiko Naito