Zoom lens barrel with focus interlocking ring

Details Zoom lens barrel with focus interlocking ring Zoom lens barrel with focus interlocking ring

1994-02-08

1995-12-19

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359701, 359699, 359694, G02B 710

Patent

active

054773873

ABSTRACT:
A zoom lens barrel including a fixed barrel, a zoom operating ring movable in an optical axis direction to effect zooming, a focusing operating ring provided on the zoom operating ring for rotation about the optical axis, a cam ring for moving lens units to predetermined positions during zooming and during focusing, in operative association with the zoom operating or focusing operating rings, at least one first lens holding ring movable in the optical axis direction in operative association with the zoom operating ring, at least one second holding ring movable in the optical axis direction in operative association with the zoom operating ring and movable in the optical axis direction in operative association with the rotation of the focusing operating ring, and holding a second and subsequent ones of the lens units, a focus interlocking ring held on the fixed barrel for rotation about the optical axis and having a key way and a rectilinear movement slot, an interlocking key provided integrally with the focusing operating ring and engaged with the key way, and an engagement pin provided integrally with the at least one second lens holding ring, and fitted in a cam slot for zooming and focusing provided in the cam ring and the rectilinear movement slot to move the at least one second lens holding ring in the optical axis direction by the focusing operating ring rotation.

REFERENCES:
patent: 4229074 (1980-10-01), Nonogaki
patent: 4299470 (1981-11-01), Shimizu
patent: 4681406 (1987-07-01), Naito
patent: 4945372 (1990-07-01), Higuchi
patent: 5144490 (1992-09-01), Yamanouchi

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