Patent ID: 9739982
Date: 2017-08-22
CPC Classifications: G02B,H02K,H02N

Claim:
1. A zoom lens, comprising a substrate, a focus driving mechanism, a first focus lens group, a zoom driving mechanism and a first zoom lens group; wherein the focus driving mechanism drives the first focus lens group to move axially, and the zoom driving mechanism drives the first zoom lens group to move axially; and wherein: the focus driving mechanism and the zoom driving mechanism are sleeves arranged coaxially, and the zoom driving mechanism is sleeved at outside of the focus driving mechanism; the focus driving mechanism is a voice coil motor and comprises a focus stator assembly, a focus mover and an elastic connection member, wherein the focus stator assembly is fixed with respect to the substrate, and the focus mover assembly is connected with the focus stator assembly through the elastic connection member; the focus stator assembly comprises a focus stator sleeve; the focus mover assembly comprises a focus mover sleeve which is sleeved with the focus stator sleeve; one of the focus stator sleeve and the focus mover sleeve is a permanent magnet sleeve, and the other is a non-magnet sleeve; and the assembly to which the non-magnet sleeve belongs further comprises: a preliminary magnetic member which is made of permanent magnetic or magnetism reception materials and fixed with respect to the non-magnet sleeve; and a driving coil which is fixed with respect to the non-magnet sleeve; wherein when the driving coil is not supplied with power, a magnetic force previously existing between the preliminary magnetic member and the permanent magnet sleeve is balanced with an elastic force of the elastic connection member.