Zoom lens and electronic imaging apparatus using the same

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

2011-06-21

2011-06-21

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

07965451

ABSTRACT:
A zoom lens includes, in order from the object side, a first lens unit with negative power, a second lens unit with positive power, a third lens unit with positive power, and a fourth lens unit. When the magnification of the zoom lens is changed in the range from a wide-angle position to a telephoto position, spacing between the first lens unit and the second lens unit is narrowed and spacing between the second lens unit and the third lens unit is widened. An aperture stop moved integrally with the second lens unit is interposed between the most image-side lens element of the first lens unit and the most image-side lens element of the second lens unit. The first lens unit has, in order from the object side, a negative lens element and a positive lens element and satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?0.15<φ1MF/φ1MR<1.0in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−3.0<φ1PF/φ1PR<−1.0in-line-formulae description="In-line Formulae" end="tail"?where φ1MFis the power of the object-side surface of the negative lens element, φ1MRis the power of the image-side surface of the negative lens element, φ1PFis the power of the object-side surface of the positive lens element, and φ1PRis the power of the image-side surface of the positive lens element.

REFERENCES:
patent: 6888683 (2005-05-01), Itoh
patent: 7382547 (2008-06-01), Satori
patent: 2006/0285222 (2006-12-01), Kanetaka
patent: 2007/0229972 (2007-10-01), Satori
patent: 2002-365543 (2002-12-01), None
patent: 2004-31807 (2004-11-01), None

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