Cam ring, and a zoom lens barrel with the cam ring

Details Cam ring, and a zoom lens barrel with the cam ring Cam ring, and a zoom lens barrel with the cam ring

2005-03-29

2005-03-29

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S700000, C359S701000, C359S704000, C359S826000, C359S822000

Reexamination Certificate

active

06873472

ABSTRACT:
A zoom lens barrel includes a linear guide ring which is positioned about an optical axis and includes a linear guide slot; a cam ring which is coaxially positioned around the linear guide ring and includes a cam groove; and a movable lens frame which supports a lens group and includes a cam follower which passes through the linear guide slot and engages in the cam groove. The cam ring is provided with a large ring portion, a small ring portion having a smaller diameter than the large ring portion, and a radial flange portion positioned therebetween. The cam groove is formed on both the small ring portion and the radial flange portion so that one end of the cam groove constitutes an open end at the radial flange potion, whereby the cam follower can be inserted into the cam groove through the open end.

REFERENCES:
patent: 5978602 (1999-11-01), Toyofuku et al.
patent: 6437924 (2002-08-01), Azegami
patent: 6445517 (2002-09-01), Nomura et al.
patent: 6519096 (2003-02-01), Nomura et al.
patent: 6522481 (2003-02-01), Nomura et al.

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