MEMS actuator structures resistant to shock
Shock-resistant MEMS structures are disclosed. In one implementation, a motion control flexure for a MEMS device includes: a rod including a first and second end, wherein the rod is tapered along its length such that it is widest at its center and thinnest at its ends; a first hinge directly coupled to the first end of the rod; and a second hinge directly coupled to the second of the rod. In another implementation, a conductive cantilever for a MEMS device includes: a curved center portion includes a first and second end, wherein the center portion has a point of inflection; a first root coupled to the first end of the center portion; and a second root coupled to the second end of the center portion. In yet another implementation, a shock stop for a MEMS device is described.
1. A conductive cantilever for a microelectromechanical systems (MEMS) device, comprising:
a curved center portion comprising a first and second end, wherein the center portion comprises a point of inflection;
a first root coupled to the first end of the center portion; and
a second root coupled to the second end of the center portion, wherein each of the first and second roots is coupled to the center portion by a respective forked junction in a direction perpendicular to the length of the conductive cantilever, wherein the forked junction comprises a plurality of parallel beams, and wherein the forked junction comprises a first tapered end coupled to a second tapered end, wherein the beams of the fork are in a direction roughly perpendicular to the length of the conductive cantilever.
2. The conductive cantilever of claim 1 , wherein the total length of the conductive cantilever is between 4.5 and 7 millimeters, and wherein the center portion is between 0.012 and 0.030 millimeters wide.
3. The conductive cantilever of claim 1 , wherein the forked junction comprises between two and twelve beams, wherein each of the beams is parallel to the other beams.
4. The conductive cantilever of claim 1 , wherein at least a portion of the conductive cantilever comprises a plurality of conductive layers for routing electrical signals and a plurality of insulating layers.
5. A MEMS actuator, comprising:
an outer frame coupled to an inner frame;
a comb drive actuator; and
a conductive cantilever comprising:
a curved center portion comprising a point of inflection;
a first root coupled to an end of the comb drive actuator; and
a second root coupled to the inner frame, wherein each of the first and second roots is coupled to the center portion by a respective forked junction in a direction perpendicular to the length of the conductive cantilever, wherein the forked junction comprises a plurality of parallel beams, and wherein the forked junction comprises a first tapered end coupled to a second tapered end, wherein the beams of the fork are in a direction roughly perpendicular to the length of the conductive cantilever.
6. The MEMS actuator of claim 5 , further comprising:
a second comb drive actuator; and
a second conductive cantilever comprising:
a curved center portion comprising a point of inflection;
a first root coupled to an end of the second comb drive actuator; and
a second root coupled to the inner frame.