| 摘要 |
An image forming device is provided with: a zoom lens system TL that performs magnification varying by changing the distance between the lens units; and an image sensor SR that converts an optical image formed by the zoom lens system TL into an electric signal. The zoom lens system TL comprises three lens units of negative, positive, positive configuration. The second lens unit Gr 2 comprises three single lens elements of, from the object side, a positive lens element L 21 , a negative meniscus lens element L 22 convex to the object side and a positive lens element L 23 . A condition 1.0<|P22/P21|<2.0 (P21 is the optical power of the object side positive lens element L 21 in the second lens unit GR 2 , and P22 is the optical power of the negative meniscus lens element L 22 in the second lens unit GR 2 ) is satisfied.
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