Zoom lens system and image-taking apparatus

Details Zoom lens system and image-taking apparatus Zoom lens system and image-taking apparatus

2004-06-30

2008-11-25

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S684000, C348S240300

Reexamination Certificate

active

07457046

ABSTRACT:
A zoom lens system is disclosed which comprises in order from an object side to an image side: a first lens unit with a positive optical power (inverse of the focal length), a second lens unit with a negative optical power; and one or more lens units; and with which at least one of the first lens unit and the second lens unit is moved during zooming. By specifying the optical characteristics (shape, material, focal length, etc.) of the lens elements making up the second lens unit in the zoom lens system, a high zoom ratio is obtained with a simple arrangement, and an optical system, which can adequately accommodate even the use of a solid-state image pickup element with a large number of pixels, is realized.

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