Patent ID: 6011659
Filing Date: 2000-01-04
Classification: G02B

Abstract:
A zoom barrel assembly for a zoom lens comprising at least first and second lens groups arranged from a subject side to an image side in order in which only one of a plurality of barrels is driven to achieve alternately focusing and zoom ratio adjusting of the zoom lens, said zoom barrel assembly comprising:a rotatable first barrel rotatable about an optical axis of the zoom lens to shift said first lens group along said optical axis;a rotatable second barrel disposed coaxially with and inside said rotatable first barrel so as to be rotatable about said optical axis relatively to said rotatable first barrel following rotation of said rotatable first barrel to shift said second lens group along said optical axis; andoscillating gear means for transmitting rotation of said rotatable first barrel to said rotatable second barrel such that said rotatable second barrel rotates together with said rotatable first barrel and causes rotational oscillation during rotation of said rotatable second barrel.