Image forming device

Details Image forming device Image forming device

2008-01-01

2008-01-01

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S689000

Reexamination Certificate

active

07315422

ABSTRACT:
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 Gr2comprises three single lens elements of, from the object side, a positive lens element L21, a negative meniscus lens element L22convex to the object side and a positive lens element L23. A condition 1.0<|P22/P21|<2.0 (P21 is the optical power of the object side positive lens element L21in the second lens unit GR2, and P22 is the optical power of the negative meniscus lens element L22in the second lens unit GR2) is satisfied.

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