Patent ID: 7382557
Filing Date: 2008-06-03
Classification: G02B

Abstract:
1. A fine adjustment mechanism for a zoom lens assembly, said fine adjustment mechanism comprising: a barrel formed as a unit engaged to a zoom mechanism having a zoom ring which is moveable on said barrel along the axis of the barrel, said barrel having a first threaded adjustment portion provided on an outer periphery surface at a bottom end of the barrel; an adjustment ring provided on an inner periphery surface thereof with a second threaded adjustment portion threadedly engaged to said first threaded adjustment portion so that said adjustment ring is moveable along the axis of said barrel when said adjustment ring is rotated relative to said barrel, said adjustment ring having at least three protrusions projecting up from an upper face thereof supporting said zoom ring for movement along the axis of said barrel when said adjustment ring is rotated relative to said barrel, and wherein said barrel has a plurality of longitudinal sliding slots through which parts of said zoom mechanism are respectively extensible to guide said zoom mechanism along the axis of said barrel.