Varifocal lens barrel

摘要

A varifocal lens barrel includes a plurality of lens groups, each of which are linearly movable in the optical axis direction thereof without rotating about the optical axis during a zooming operation and during a focusing operation, including a base barrel which is linearly movable in the optical axis direction by rotation of a zoom operational ring, wherein lens frames of the respective lens groups are each supported by the base barrel.

主权项

1. A varifocal lens barrel including a plurality of lens groups, each of the plurality of lens groups is linearly movable in an optical axis direction thereof without rotating about the optical axis during a zooming operation and during a focusing operation, the varifocal lens barrel comprising:
a base barrel which is linearly movable in the optical axis direction by rotation of a zoom operational ring, wherein lens frames of respective said lens groups are each supported by said base barrel, a zoom cam ring that is rotatable by manual rotation of said zoom operational ring; at least one sub zoom cam ring which is integrally rotatable together with said zoom cam ring, wherein each said sub zoom cam ring is supported by said base barrel via cam engagement with said zoom cam ring and is movable in the optical axis direction by rotation of said zoom cam ring, wherein at least one lens frame of a corresponding lens group of said plurality of lens groups is in cam engagement with said at least one sub zoom cam ring so that said at least one lens frame is movable in the optical axis direction by rotation of said at least one sub zoom cam ring.