Shock resistant lens device

Details Shock resistant lens device Shock resistant lens device

1979-02-28

1980-10-07

Truhe, J. V.

350187, G02B 1514, G03B 300

Patent

active

042265207

ABSTRACT:
An impact resistant zoom lens with a common focusing and zooming ring includes a camera mountable main barrel, front and rear axially movable lens carrying mounts, a control ring rotatably and slidably engaging the barrel and affixed to the front mount, an axial sleeve helicoid coupled to the first mount, a cylindrical cam rotatably supported by the barrel and longitudinally stationary therein and followers carried by the axial sleeve rearwardly thereof and by the rear mount and slidably engaging respective cam slots in the cam and guide tracks in the barrel. In order to prevent damage to the lens mechanism attendant to an impact on the front mount abutment members or faces are located on the front mount or sleeve and have large areas in stop engagement when the front mount is in its rearmost position with the follower movable therewith being shortly spaced from the rear end of the respective cam slot. Similarly related faces or members may be provided for limiting the forward movement of the front mount.

REFERENCES:
patent: 3484159 (1969-12-01), Roman et al.
patent: 3594068 (1971-07-01), Kirstein et al.
patent: 3663093 (1972-05-01), Iida
patent: 3944340 (1976-03-01), Hashimoto
patent: 4032939 (1977-06-01), Elton
patent: 4110008 (1978-08-01), Uesugi et al.
patent: 4172634 (1979-10-01), Thompson

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