What is a scanning mirror?
A scanning mirror is a torsional beam that has a fixed width. It is used for imaging purposes. The frequency of the scan is determined by the design and can vary between 0.1 Hz and 50 kHz. The deflection motion in a Scanning Mirror is resonant and quasi-static. It also has a magnetic force that is caused by the interaction between the coil and the off-chip magnets.
The Scanning Mirror's reflective surface is thin but it is thick enough to prevent resonances. A scanning mirror that is too thin could vibrate and resonate, similar to a diving board. The reason is that the majority of scanning mirrors are cantilevers that have only one side supported. A ripple in the cross-axis can result from too thin mirrors. To avoid resonances the width and thickness of a Scanning Optical System must be less than one-twelveth that of the length of its unsupported side.
There are two sets of Coordinate Break surface for the scanning Mirror. The outer set implements the geometry of the nominal position, while the inner set is a trapezoid shape. The bottom is larger than the top, and the top is smaller than the bottom. This trapezoidal arrangement results in a rectangular reflection. The center portion is the center while the outer portion is the width. This symmetrical shape permits the scanning mirror to move with ease.
Typically, a Scanning Mirror is composed of two sets of Coordinate Break surfaces. The outer set is the one that implements the geometry of the nominal location and the inner set is responsible for the geometry of the scan. FIG. 6. In the diagram below the scanning mirror is depicted laser crylink. There is a circular opening on the bottom of the Scanning Mirror 78, allowing the beam to pass through.
The mirrors for scanning are securely held in the base 11. The base 11 is a rectangular structure, and the scanners are mounted on the base. The bottom part of the mirror that is used for scanning has a width that is greater than the size of the top part. The scanners have an axis 34 of rotation that is fixed. The axis of rotation is the second part of the axis. There are two sets of Coordinate Break surfaces in the Scanning Mirror.
A scanning mirror is comprised of a reflective surface as well as a pre-set width measurement. The dimension of the surface is equal to the diameter of the beam. The scanning mirror's top and bottom portions are the same size. The top and bottom portions of the mirror reflect different wavelengths. The reflections of the scanners are reflected off both surfaces. The top mirror reflect the beams of light differently than the bottom.