Zoom lens optical system

Details Zoom lens optical system Zoom lens optical system

2006-06-27

2006-06-27

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000, C359S683000, C359S684000, C359S685000, C359S715000, C359S714000, C359S713000, C359S726000, C359S740000, C359S763000

Reexamination Certificate

active

07068441

ABSTRACT:
A zoom lens optical system includes a first optical group with a first lens having negative refraction, a second lens having positive refraction, and a light path changing unit to change the path of an incident light passing through the first lens to have light incident on the second lens. A second optical group is provided for varying magnification. The second optical group has a third lens having negative refraction, a fourth lens, and a fifth lens, wherein the fourth and fifth lenses are integrally connected and have negative refraction. A third optical group includes an iris diaphragm, a sixth lens having positive refraction, and a seventh lens having negative refraction. A fourth optical group is provided for focusing. The fourth optical group has an eighth lens and a ninth lens being integrally connected and both having positive refraction.

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patent: 5504626 (1996-04-01), Oshikiri et al.
patent: 6865026 (2005-03-01), Nozawa et al.
patent: 2004/0201903 (2004-10-01), Achtner
patent: 2004-163477 (2004-06-01), None
patent: 1996-0006421 (1996-05-01), None
patent: 1996-008397 (1996-06-01), None
patent: 1998-074173 (1998-11-01), None
European Patent Office Search Report dated Dec. 5, 2005.

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