Zoom lens and image pickup apparatus

Details Zoom lens and image pickup apparatus Zoom lens and image pickup apparatus

2005-06-07

2005-06-07

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S682000, C359S689000

Reexamination Certificate

active

06903878

ABSTRACT:
A zoom lens which suppresses variations of an exit pupil and is telecentric on the image side in the whole range of zooming comprises, from the object side toward the image side: a first negative in optical power, an aperture stop, a second lens unit positive in optical power and a third lens unit positive in optical power. In zooming from the wide angle end to telephoto end, the distance between the first lens unit and the aperture stop narrows, the between the aperture stop and the second lens unit narrows, and the between the second lens unit and the third lens unit widens; and the condition: 0<(Dw−Dt)/fw<1 is satisfied, where is the distance between aperture stop and the second lens unit at the wide angle end is Dw, at the telephoto end is Dtand the focal length at the wide angle end fw.

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English Abstract of H9(1997)-258103 (Item A) from JPO.
Copy of Office Action dated May 21, 2004 issued in counterpart Application No. 2001-236283 pending in the Japanese Patent Office.
Translation of Office Action dated May 21, 2004 issued in counterpart Application No. 2001-236283 pending in the Japanese Patent Office (Item BB).

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