Patent ID: 11906811
Assignee: DATALOGIC IP TECH, S.R.L.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A device for focusing a light beam, comprising:
an optical assembly comprising at least one focusing lens and/or mirror;
a support structure which supports the optical assembly;
a magnetic actuator configured to move the optical assembly with respect to the support structure along a moving direction substantially parallel to an optical axis of the optical assembly;
at least one position sensor configured to provide an indication of the position of said optical assembly with respect to said support structure;
wherein the magnetic actuator comprises:
at least one permanent magnet integrally associated with one of the optical assembly and the support structure;
at least one first electrical winding integrally associated with the other one of the optical assembly and the support structure and configured to allow a passage of an electric current that interacts with said at least one permanent magnet and causes a movement of the optical assembly along said moving direction until the optical assembly is brought to a desired focusing position; and
at least one second electrical winding integrally associated with the other one of the optical assembly and the support structure and configured to be short-circuited in response to the position of the optical assembly as indicated by said at least one position sensor reaching a defined position that is close to said desired focusing position so as to generate, due to an electromagnetic induction generated by a relative motion between said at least one permanent magnet and said at least one second electrical winding, a braking force that opposes the movement of the optical assembly along said moving direction.