Zoom lens and imaging system incorporating it

Optical: systems and elements – Lens – With variable magnification

Reexamination Certificate

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C359S680000, C359S689000

Reexamination Certificate

active

11322564

ABSTRACT:
The invention relates to a small-format yet high-performance two units or three units type zoom lens with a negative unit at the front, which has a zoom ratio of about 3, an angle of view of as wide as 60° at the wide-angle end and high image-formation capability, and is much less susceptible to chromatic blurring, with a compact lens barrel. The zoom lens comprises a first lens unit G1of negative refracting power and a second lens unit G2of positive power, wherein zooming is implemented by varying the space between the lens units. The first lens unit G1is made up of one negative lens L11and one positive lens L12, two in all, and satisfies specific conditions with respect to their refractive index and Abbe constant.

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patent: 6809879 (2004-10-01), Mihara
patent: 7023625 (2006-04-01), Nanba et al.
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patent: 2003/0197949 (2003-10-01), Eguchi
patent: 2004/0080632 (2004-04-01), Iwasawa et al.
patent: 2006/0176575 (2006-08-01), Katakura
patent: 2004-061675 (2004-02-01), None

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