MPS Microsystems - Solutions for defense & aerospace - Presentation - Page 4
SOLUTIONS FOR OPTICS & PHOTONICS INDUSTRY
The system is driven by standard stepper or BLDC
micromotors coupled with either ground lead screw or high
precision MPS ball screws. MPS is using its own miniature
L-Type linear ball bearing for smooth and play free guiding.
High precision requirements are put on the frame, which
has to ensure perfect
perpendicularity
between lenses and
z-axis axis during any
movement. The linear
positioning resolution
is 1 µm over the full
stroke.
Ophtalmology
Eye tomography as well as cataract and refractive surgery
require the focus of the laser beam to be very precise. MPS
has developed high-precision miniature lens actuators for
manufacturers of ophthalmic devices. These actuators
consist of a 6 mm micro motor, 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 the 0 position with a
precision of 1 µm between each measurement.
Microscopy
Eye tomography as well as cataract and refractive surgery
Microscopic observation of three-dimensional samples can
be a challenge when moving the objective in the z-axis
close to the sample: the risk of touching and destroying it
is significant. MPS has developed a backlash-free, flexure
elements based system, which moves 2 lenses laterally in
order to make the fine focus and thus eliminate the risk of
contact with the sample.
The system with a full stroke of 2.5 mm is driven in
open loop by 2 stepper motors attached to a miniature
lead screw. Light barriers set the home position at the
beginning of each operation. The position repeatability is
below 2 microns.
The simplicity of
the system makes
it very reliable, easy
to connect and
affordable.
