Zoom lens system and electronic image pickup apparatus using...

Details Zoom lens system and electronic image pickup apparatus using... Zoom lens system and electronic image pickup apparatus using...

2007-06-07

2011-11-01

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

08049970

ABSTRACT:
A zoom lens system has, in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an aperture stop, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power; during magnification change, the first lens unit, the second lens unit, the third lens unit, the fourth lens unit and the aperture stop move; the first lens unit includes a negative lens and a positive lens in order from the object side; the second lens unit includes a negative lens and a positive lens in order from the object side; the third lens unit includes three or less lenses including one positive lens and one negative lens; and the fourth lens unit includes one positive lens.

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