Zoom lens barrel including a rotatable cam ring

Details Zoom lens barrel including a rotatable cam ring Zoom lens barrel including a rotatable cam ring

2007-07-10

2007-07-10

Harrington, Alicia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

11264037

ABSTRACT:
A zoom lens barrel includes a stationary cylindrical member, a rotatable cam ring and a linearly-guided member concentrically provided in that order from the outside of the zoom lens barrel, a first cam mechanism which is provided between the rotatable cam ring and the linearly-guided member to move the linearly-guided member in an optical axis direction without rotating upon rotation of the rotatable cam ring, and a second cam mechanism provided between the stationary cylindrical member and the rotatable cam ring to move the rotatable cam ring in an optical axis direction upon rotation of the rotatable cam ring. The second cam mechanism causes the rotatable cam ring to rotate while moving in the optical axis direction so that the amount of movement of the rotatable cam ring in the optical axis direction with respect to the angle of rotation thereof is nonlinear.

REFERENCES:
patent: 4848884 (1989-07-01), Enomoto
patent: 6522478 (2003-02-01), Nomura et al.
patent: 6522482 (2003-02-01), Nomura et al.
patent: 6873472 (2005-03-01), Suzuki
patent: 2003/0184877 (2003-10-01), Kabe
patent: 2003-185907 (2003-07-01), None
patent: 3573127 (2004-07-01), None

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