Patent ID: 8503105
Filing Date: 2013-08-06
Classification: G02B,G03B

Abstract:
1. A zooming adjustment mechanism, comprising: a holder having at least two grooves; a zoom ring confined to the holder and coupled to a zoom bar, wherein the zoom ring has a top surface, a bottom surface opposite the top surface, a first side surface and a second side surface opposite the first side surface; at least two rollers respectively confined to the grooves of the holder and in contact with the bottom surface of the zoom ring; a first resilient sheet disposed on a first side of the holder, wherein each of the two ends of the first resilient sheet leans against one of the rollers; a second resilient sheet disposed on a second side of the holder opposite the first side of the holder, wherein each of the two ends of the second resilient sheet leans against one of the rollers; and at least one rib structure formed on the bottom surface of the zoom ring, wherein each of the rollers has at least one slot formed in a position corresponding to the rib structure.