Actuators for Miniature Lenses
Eye tomography and cataract operations require the focus of the laser beam to be very precise. MPS has developed high-precision miniature lens actuators for a manufacturer of ophthalmic devices.
These actuators consist of a 6 mm micromotor, a pre-loaded screw-nut system and a linear guideway. The system is designed in such a way that it is able to compensate for the imperfection of axes alignment. The most stringent requirement is to find point 0 with a precision of 1 µm between each measurement.
Developed by MPS, the system very precisely actuates a lens on a linear basis with a laser beam passing through it. This actuator consists of a ball screw and two linear bearings and must ensure that the lens is completely perpendicular with its axis during any movement. The linear positioning precision is 1 µm.