Zoom lens drive mechanism

Details Zoom lens drive mechanism Zoom lens drive mechanism

1989-08-25

1990-10-09

Arnold, Bruce Y.

350255, G02B 1514, G02B 704

Patent

active

049616358

ABSTRACT:
A zoom lens drive mechanism which is capable of zooming by moving first and second lens groups with a constant relation being maintained between them and of focusing by moving only the first lens group. A zoom shaft is disposed in parallel with the optical axis of the zoom lens and on the zoom shaft there is rotatably disposed a zoom cam ring which includes two cam grooves in the outer periphery thereof. In the zoom shaft there is disposed a first lens group drive means which is free to move in the axial direction of the zoom shaft and in the first lens group drive means there is provided a focus cam ring such that it is free to rotate. Two cam followers respectively provided in the first lens group drive means and in the second lens group are in engagement with the two cam grooves in the zoom cam ring, respectively, and a cam follower provided in the first lens group is in engagement with a cam groove formed in the focus cam ring.

REFERENCES:
patent: 2532684 (1950-12-01), Walker
patent: 3610733 (1970-08-01), Back
patent: 4008951 (1977-02-01), Himmelsbach
patent: 4541695 (1985-09-01), Wainwright et al.

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