Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

2006-05-23

2006-05-23

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S700000, C359S699000, C359S698000, C359S823000, C359S826000, C359S704000, C396S055000, C396S072000, C396S348000, C396S349000

Reexamination Certificate

active

07050244

ABSTRACT:
A zoom lens barrel comprises an exterior unit, which mainly forms an exterior portion, an optical unit having an image pickup optical system built therein, and a control unit and can be detachably mounted on a single-lens reflex camera. The optical unit includes first and second group lenses as the image pickup optical system, which can move forward and rearward in zooming and focusing, and a third group lens which can move forward and rearward in zooming. Particularly, in focusing, a first group lens holding frame for holding the first group lens and a second group lens holding frame for holding the second group lens are driven forward and rearward in a different amount in an optical axis direction through a cam follower and two cam grooves by driving a focus ring in rotation, thereby focusing is executed. The lens barrel can cope with a forward/rearward movement required in zooming and focusing and can be reduced in size.

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