Zoom lens and apparatus using the same

Details Zoom lens and apparatus using the same Zoom lens and apparatus using the same

2006-03-07

2006-03-07

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000, C359S740000, C359S775000, C359S683000, C359S684000, C359S685000

Reexamination Certificate

active

07009780

ABSTRACT:
A zoom lens according to the present invention includes, in order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. During a magnification change from the wide-angle end through the telephoto end, the first lens unit and the fourth lens unit shift from the image-surface side toward the object side, a space between the first lens unit and the second lens unit increases, and spaces between individual lens units change. During a focusing from an object at the infinite distance onto an object at a near distance, the second lens unit and the third lens unit individually shift independently.

REFERENCES:
patent: 5144488 (1992-09-01), Endo et al.
patent: 5737128 (1998-04-01), Usui
patent: 5898525 (1999-04-01), Suzuki
patent: 6002528 (1999-12-01), Tomita
patent: 2002/0063970 (2002-05-01), Uzawa et al.
patent: 03-289612 (1991-12-01), None

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