MEMS actuators and switches
View Patent ↗MEMS structures employing movable conductive member and a number of current-carrying stationary contact terminals which advantageously permit higher current carrying capability that prior art devices in which currents flowed through movable conductive members. Current carrying capability in excess of 1.0 amp without the need for additional current limiting devices is realized thereby lowering overall system manufacturing costs for systems employing our structures.
1. A microelectromechanical system (MEMS) switch structure, said switch structure comprising:
a first pair of spaced-apart, stationary electrical contacts each of said first pair of spaced-apart, stationary electrical contacts providing a first switch input;
a first MEMS actuator;
a first support arm operatively connected to the first MEMS actuator;
a first moveable conductive member operatively mounted to the first support arm such that the first moveable conductive member is selectively deflected by activation of said first MEMS actuator with respect to said first pair of spaced-apart, stationary electrical contacts to thereby selectively switch between a first switch open position and a first switch closed position;
a second pair of spaced-apart, stationary electrical contacts, each of said electrical contacts providing a second switch input;
a second MEMS actuator;
a second support arm operatively connected to the second MEMS actuator;
a second moveable conductive member operatively mounted to the second support arm such that the second moveable conductive member is selectively deflected by activation of said second MEMS actuator with respect to said second pair of spaced-apart, stationary electrical contacts to selectively switch between a second switch open position and a second switch closed position.
2. The microelectromechanical system (MEMS) switch structure as claimed in claim 1 , wherein said first MEMS actuator comprises a first elongated hot arm member, a first elongated cold arm member and a first dielectric tether, further wherein said first dielectric tether operatively couples the first elongated hot arm member and the first elongated cold arm member, further wherein said first support arm is operatively connected to the first elongated cold arm member.
3. The microelectromechanical system (MEMS) switch structure as claimed in claim 2 , wherein said first hot arm member comprises two spaced-apart portions, each of said two spaced-apart portions having a corresponding anchor pad for receiving a voltage.
4. The microelectromechanical system (MEMS) switch structure as claimed in claim 2 , wherein said first dielectric tether is made of a photoresist material.
5. The microelectromechanical system (MEMS) switch structure as claimed in claim 2 , further comprising a first set of at least two additional tethers, each disposed over a portion of the first hot arm member and the first cold arm member.
6. The microelectromechanical system (MEMS) switch structure as claimed in claim 2 , wherein said first MEMS actuator further comprises a second elongated hot arm member, further wherein said first dielectric tether operatively couples the first elongated hot arm member, the first elongated cold arm member and the second elongated hot arm member.
7. The microelectromechanical system (MEMS) switch structure as claimed in claim 2 , wherein the first elongated hot arm member is set at an angle with respect to the first elongated cold arm member.
8. The microelectromechanical system (MEMS) switch structure as claimed in claim 1 , further wherein each of said first MEMS actuator and said second MEMS actuator comprises a corresponding tip member for performing a mechanical latch.
9. The microelectromechanical system (MEMS) switch structure as claimed in claim 8 , wherein said second MEMS actuator comprises a second MEMS actuator elongated hot arm member, a second MEMS actuator elongated cold arm member and a second MEMS actuator dielectric tether, further wherein said second MEMS actuator dielectric tether operatively couples the second MEMS actuator elongated hot arm member and the second MEMS actuator elongated cold arm member.
10. The microelectromechanical system (MEMS) switch structure as claimed in claim 9 , wherein said second MEMS actuator hot arm member comprises two spaced-apart portions, each of said two spaced-apart portions having a corresponding anchor pad for receiving a voltage.
11. The microelectromechanical system (MEMS) switch structure as claimed in claim 9 , further comprising a second set of at least two additional tethers, each disposed over a portion of the second MEMS actuator elongated cold arm member and the second MEMS actuator elongated cold arm member.
12. The microelectromechanical system (MEMS) switch structure as claimed in claim 9 , wherein said second MEMS actuator elongated hot arm member is set at an angle with respect to the second MEMS actuator elongated cold arm member.
13. The microelectromechanical system (MEMS) switch structure as claimed in claim 1 , wherein said first support arm comprises a rigid base portion secured and a spring-like portion, further wherein said rigid base portion is operatively connected to the first MEMS actuator and said spring-like portion is connected to the first moveable conductive member.
14. The microelectromechanical system (MEMS) switch structure as claimed in claim 1 , wherein said switch structure further comprises:
a third pair of spaced-apart, stationary electrical contacts each of said third pair of spaced-apart, stationary electrical contacts providing a third switch input;
a third moveable conductive member operatively mounted to the first support arm such that the third moveable conductive member is selectively deflected by activation of said first MEMS actuator on said third pair of spaced-apart, stationary electrical contacts to selectively switch between a third switch open position and a third switch closed position.
15. The microelectromechanical system (MEMS) switch structure as claimed in claim 14 , wherein said switch structure further comprises:
a fourth pair of spaced-apart, stationary electrical contacts each of said fourth pair of spaced-apart, stationary electrical contacts providing a fourth switch input;
a fourth moveable conductive member operatively mounted to the second support arm such that the fourth moveable conductive member is selectively deflected by activation of said second MEMS actuator on said fourth pair of spaced-apart, stationary electrical contacts to selectively switch between a fourth switch open position and a fourth switch closed position.