Patent
1979-10-12
1980-12-30
Henry, Jon W.
350255, G02B 1516, G02B 710
Patent
active
042419824
ABSTRACT:
A zoom lens barrel has first and second manually operable members movable for effecting a zooming operation in different directions. The first operable member is axially movable for effecting movement of a first lens group and is threaded with an axially movable follower member such that the first operable member and the follower member are axially moved in response to axial movement of the other. A first pin-slot arrangement interconnects the follower member and a rotatable intermediate cam ring with one another such that the cam ring is rotated in response to axial movement of the follower member while the follower member is axially moved in response to rotation of the cam ring. A second pin-slot arrangement interconnects the cam ring with a lens frame supporting a second lens group such that the second lens group is moved for zooming in response to rotation of the cam ring with a given spatial relationship with respect to the first lens group. The second operable member is rotatable together with the cam ring. An adjusting device may adjust friction between a stationary barrel and the second operating member or the cam ring, thereby preventing accidental rotation of the cam ring.
REFERENCES:
patent: 3277783 (1966-10-01), Eggert
patent: 4171880 (1979-10-01), Mori et al.
Henry Jon W.
Minolta Camera Kabushiki Kaisha
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