MEMS actuators and switches
View Patent ↗Microelectromechanical (MEMS) structures and switches employing movable actuators wherein particular ones of which move perpendicular to an underlying substrate and particular others move in a direction substantially parallel to the underlying substrate thereby providing more positive actuation.
1. A microelectromechanical (MEMS) switch comprising:
a substrate having a planar top surface;
a first movable actuator affixed to the top surface of the substrate in a cantilever manner such that it has a substantially immovable end and a free movable end; and
a second movable actuator affixed to the top surface of the substrate in a cantilever manner such that it has a substantially immovable end and a free movable end;
a pair of electrical contacts disposed upon the substrate;
an electrical conductive member attached to the movable end of the first actuator such that the conductive member electrically contacts the pair of electrical contacts when the first actuator is in its deflected position;
a latching mechanism which secures the first movable actuator and the second movable actuator in their deflected positions
wherein upon activation said first movable actuator moves from a neutral position to a deflected position wherein said first actuator movement is in a direction perpendicular to the planar substrate surface and said second movable actuator upon activation moves from a neutral position to a deflected position wherein said second actuator movement is in a direction parallel to the planar substrate surface;
wherein the first movable actuator includes a hot arm member and a cold arm member said hot arm member having a pair of pads affixed to the substrate such that when a sufficient electrical current flows between the pair of pads the hot arm member elongates sufficiently to effect the movement of the first movable actuator to its deflected position; and
wherein the cold arm member of the first movable actuator comprises a pair of pads affixed to the substrate such that when a sufficient electrical current flows between the pair of pads the cold arm member elongates sufficiently to effect the movement of the first movable actuator towards its neutral position.
2. The MEMS switch of claim 1 wherein the second movable actuator comprises a hot arm member and a cold arm member said hot arm member having a pair of pads affixed to the substrate such that when a sufficient electrical current flows between the pair of pads the hot arm member elongates sufficiently to effect the movement of the second movable actuator to its deflected position.
3. The MEMS switch of claim 2 wherein a portion of the latching mechanism is provided on the first movable actuator and a mated other portion of the latching mechanism is provided on the second movable actuator such that the latching mechanism becomes engaged upon movement of the actuators to their deflected position.
4. The MEMS switch of claim 1 wherein said mated portions of the latching mechanism includes a pin and a hole.
5. A MEMS switch comprising:
a substrate having a planar surface upon which is disposed at least a pair of electrical contacts;
means for electrically connecting the pair of electrical contacts wherein said means for electrically connecting the pair of electrical contacts moves from a neutral position to a deflected position in a direction that is substantially perpendicular to the planar surface to effect the electrical connecting; and
means for securing the means for electrically connecting the pair of electrical contacts in its deflected position wherein said means for securing the means for electrically connecting the pair of electrical contact moves from a neutral position to a deflected position in a direction that is substantially parallel to the planar surface to effect the securing;
means for maintaining the means for securing the means for electrically connecting the pair of electrical contacts in its deflected position thereby securing the means for electrically connecting the pair of electrical contacts in its deflected position;
means for moving the means for electrically connecting the pair of electrical contacts from its normal position to its deflected position upon application of a sufficient control voltage thereby elongating a portion of the means for electrically connecting the pair of electrical contacts;
means for moving the means for electrically connecting the pair of electrical contacts from its deflected position to its normal position upon application of a sufficient control voltage thereby elongating a portion of the means for electrically connecting the pair of electrical contacts wherein said means for moving the means for electrically connecting the pair of electrical contacts from its deflected position to its normal position is not the same as the means for moving the means for electrically connecting the pair of electrical contacts from its normal position to its deflected position.