Optical unit, and image taking apparatus provided therewith

Details Optical unit, and image taking apparatus provided therewith Optical unit, and image taking apparatus provided therewith

2007-06-05

2007-06-05

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S684000, C359S685000, C359S713000, C359S714000, C359S715000, C359S726000, C359S740000, C359S774000

Reexamination Certificate

active

11451230

ABSTRACT:
A plurality of lens units in an optical unit has at least: from the object side toward the image side, a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power. When at least the first lens unit moves from the image side to the object side in zooming from the wide-angle end position to the telephoto end position, at least one gap between the lens units varies. Predetermined conditional formulae are satisfied.

REFERENCES:
patent: 5285317 (1994-02-01), Uzawa
patent: 2001-117000 (2001-04-01), None
patent: 2001-107622 (2002-04-01), None

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