Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2005-10-11
2005-10-11
Mack, Ricky (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S701000
Reexamination Certificate
active
06954314
ABSTRACT:
A cam mechanism of a lens barrel includes first and second ring members; cam grooves having similar cam diagrams formed on one of the first and second ring members, and cam followers formed on the other thereof. Two groove/follower groups positioned at different positions in a circumferential direction. The cam grooves of one of the two groove/follower groups intersect cam grooves of another of the two groove/follower groups, respectively. One of the following is satisfied: (a) a distance in the optical-axis direction between front and rear groove/follower sets of one of the two groove/follower groups is different from that between the front and rear groove/follower sets of another of the two groove/follower groups, and (b) a distance in the circumferential direction between two front groove/follower sets of the two groove/follower groups is different from that between two the rear groove/follower sets of the two groove/follower groups.
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Nomura Hiroshi
Okuda Isao
Yamazaki Yoshihiro
Mack Ricky
PENTAX Corporation
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