OPTICAL DEVICE

摘要

In an optical device an objective is moved axially along its optical axis relative to a frame in a parallel guide by means of first electro-magnetic actuating means connected to the objective and second electromagnetic actuating means arranged on the frame, which first and second actuating means co-operate axially with each other by means of a magnetic field which is oriented transversely of the optical axis and transversely of the direction of movement of the objective. In order to suppress vibrations caused by axial reactive forces transmitted from the second actuating means to the frame, axially resilient damping means are arranged between the frame and at least a part of the second actuating means. The movements of the second actuating means do not affect the position of the objective because an axial displacement of the radial magnetic field does not give rise to an axial movement of the objective.