Zoom lens and image pickup apparatus including the same

Details Zoom lens and image pickup apparatus including the same Zoom lens and image pickup apparatus including the same

2007-05-30

2009-11-24

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S557000

Reexamination Certificate

active

07623300

ABSTRACT:
A zoom lens comprises, from object to image side: a positive first-lens unit; a negative second-lens unit; a positive third-lens unit; and a positive fourth-lens unit; the third-lens unit comprising a negative 3a'th-lens sub-unit and positive 3b'th-lens sub-unit from object side; the second-lens unit and fourth-lens unit moving on the optical axis during zooming; the 3b'th-lens sub-unit moving in a direction perpendicular to the optical axis, thereby displacing an image perpendicular to the optical axis; the 3a'th-lens sub-unit comprising a negative-lens element G3an whose both surfaces are spherical, and a positive-lens element whose both surfaces are spherical; the 3b'th-lens sub-unit including a positive-lens element G3bp including an aspherical lens surface, and a negative-lens element; wherein, assuming that the indices of the materials of the negative-lens element G3an and the positive-lens element G3bp are NG3an and NG3bp respectively, 0.21<NG3an−NG3bp is satisfied.

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