Patent ID: 7550810

Claim:
A microelectromechanical (MEMS) device comprising: a substrate; a movable layer mechanically coupled to the substrate, the movable layer movable between a first position and a second position, wherein the movable layer is configured to move from the first position to the second position at a first rate and wherein the movable layer is configured to move from the second position to the first position at a second rate that is faster than the first rate; a cavity defined between the substrate and the movable layer, the cavity containing a fluid; and a fluid conductive element through which the fluid is configured to flow at a first flowrate from inside the cavity to outside the cavity upon movement of the movable layer from the second position to the first position and through which the fluid is configured to flow at a second flowrate from outside the cavity to inside the cavity upon movement of the movable layer from the first position to the second position, the second flowrate slower than the first flowrate, wherein the fluid conductive element comprises at least one aperture through the movable layer, wherein the fluid conductive element further comprises at least one stopple that at least partially restricts fluid flow through the aperture.