Zoom lens system and image pickup apparatus using the same

Details Zoom lens system and image pickup apparatus using the same Zoom lens system and image pickup apparatus using the same

2007-09-17

2008-11-11

Choi, William C. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S774000, C359S715000

Reexamination Certificate

active

07450316

ABSTRACT:
A zoom lens system comprises, in order from an 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 positive refractive power and a fourth lens unit having a positive refractive power, during zooming from a wide-angle end to a telephoto end, at least the first lens unit and the third lens unit are moved toward the object side so as to increase a space between the first lens unit and the second lens unit and decrease a space between the second lens unit and the third lens unit, and predetermined conditions are satisfied.

REFERENCES:
patent: 5570233 (1996-10-01), Mihara et al.
patent: 5572277 (1996-11-01), Uzawa et al.
patent: 6462886 (2002-10-01), Hagimori
patent: 6924938 (2005-08-01), Nishina et al.
patent: 7167320 (2007-01-01), Ohashi
patent: 08-050244 (1996-02-01), None
patent: 2005-017915 (2005-01-01), None
patent: 2006-78979 (2006-03-01), None

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