Zoom lens assembly with single operational member and means to p

Details Zoom lens assembly with single operational member and means to p Zoom lens assembly with single operational member and means to p

1981-07-16

1983-08-09

Henry, Jon W.

G02B 710

Patent

active

043975283

ABSTRACT:
In a lens assembly having a single operational member adapted to be manipulated to perform both focusing operation and zooming operation, there is provided a rotation preventing device for inhibiting rotation of the single operation member during axial movement thereof to perform zooming operation in order to prevent misalignment of a previously established focusing adjustment. The rotation preventing device includes a mechanism for establishing a frictional or spring-like force between the single operational member and a barrel member of the lens assembly in order to avoid relative rotation therebetween during zooming operation and the frictional force is initiated by a manually operable stopper member on the lens assembly.

REFERENCES:
patent: 3277783 (1966-10-01), Eggert et al.
patent: 4229074 (1980-10-01), Nonogaki
patent: 4273423 (1981-06-01), Vesugi

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