Zoom optical system and imaging apparatus using the same

Details Zoom optical system and imaging apparatus using the same Zoom optical system and imaging apparatus using the same

2007-05-22

2008-11-25

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07457047

ABSTRACT:
A zoom optical system includes, in order from the object side, a first lens unit with positive refracting power, a second lens unit with negative refracting power, a third lens unit with positive refracting power, and a fourth lens unit with positive refracting power. An aperture stop is interposed between the second lens unit and the fourth lens unit. Upon zooming, at least, the first lens unit, the second lens unit, and the third lens unit are moved so that spacings between these lens units are varied. The first lens unit is constructed with at most two lens elements. The second lens unit includes, in order from the object side, a first negative lens in which the image-side surface is greater in curvature than the object-side surface, an air spacing, a second negative lens in which the image-side surface is greater in curvature than the object-side surface, an air spacing, and a positive lens in which the object-side surface is greater in curvature than the image-side surface. The second negative lens is constructed to satisfy the following condition:in-line-formulae description="In-line Formulae" end="lead"?−0.7<f2/r23<0.05in-line-formulae description="In-line Formulae" end="tail"?where r23 is the radius of curvature of the object-side surface of the second negative lens and f2is the focal length of the second lens unit.

REFERENCES:
patent: 6950247 (2005-09-01), Saruwatari
patent: 2002/0063970 (2002-05-01), Uzawa et al.
patent: 2003/0197950 (2003-10-01), Eguchi
patent: 2004/0136086 (2004-07-01), Ohtake
patent: 2001-242379 (2001-09-01), None
patent: 2002-072087 (2002-03-01), None

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