ZOOM-LENS Russian patent published in 2018 - IPC G02B7/04 G02B15/20 

FIELD: photo equipment.

SUBSTANCE: zoom lens contains a focusing drive mechanism and a zoom drive mechanism and corresponding lens units. Zoom drive mechanism is concentrically located outside the drive mechanism. Focusing drive mechanism is a linear motor and comprises stator focus assembly (7a1) and anchor focus assembly (7a2) that are connected by elastic connecting element (7a3). One of stator focus bushing (7a11) in the stator focus assembly and the anchor focus bushing (7a21) in the anchor focus assembly is a permanent magnetic bushing, and the other of stator focus bushing (7a11) and the anchor focus bushing (7a21) is a non-magnetic bushing, and the assembly, to which the non-magnetic bushing belongs, further comprises preliminary magnetized element (7a22) and drive coil (7a23). When implementing the claimed technical solution, the following is observed: because of the magnetic force initially existing between the preliminary magnetized element and the permanent magnetic bushing, the resilient coupling element is in a state of equilibrium of the forces without supply of electric current, so that a small electromagnetic force is required to drive the resilient coupling element and, accordingly, the drive current and power consumption are reduced. In addition, since the zoom drive mechanism is concentrically located outside the focusing drive mechanism, it is easy to realize a large aperture and facilitate installation and implementation.

EFFECT: it is possible to realize easily a large aperture and facilitate installation and implementation.

11 cl, 12 dwg