Zoom lens system and image pickup apparatus including the same

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

2008-09-09

2008-09-09

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S773000, C359S715000, C396S072000, C348S360000

Reexamination Certificate

active

11784104

ABSTRACT:
There is disclosed a zoom lens system comprising, 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 negative refractive power. During zooming from a wide-angle end to a telephoto end, a space between the first lens unit and the second lens unit enlarges, a space between the second lens unit and the third lens unit narrows, a space between the third lens unit and the fourth lens unit changes, and all of the first to fourth lens units move along an optical axis. The zoom lens system further comprises an aperture stop which moves integrally with the third lens unit during the zooming.

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patent: 04-053916 (1992-02-01), None
patent: 09-197272 (1997-07-01), None

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