Abstract:
An electromechanical device includes a first frame having a first aperture therein, a second frame suspended in the first frame wherein the second frame has a second aperture therein, and a plate suspended in the second aperture. A first pair of beams support the second frame along a first axis relative to the first frame so that the second frame rotates about the first axis. A second pair of beams supports the plate along a second axis relative to the second frame so that the plate rotates about the second axis relative to the frame. The first and second axes preferably intersect at a 90° angle. A first actuator provides mechanical force for rotating the second frame relative to the first frame about the first axis. A second actuator provides mechanical force for rotating the plate relative to the second frame about the second axis. Accordingly, the plate can be independently rotated relative to the first axis and the second axis. Related methods are also disclosed.
Abstract:
An electromechanical device includes a first frame having a first aperture therein, a second frame suspended in the first frame wherein the second frame has a second aperture therein, and a plate suspended in the second aperture. A first pair of beams support the second frame along a first axis relative to the first frame so that the second frame rotates about the first axis. A second pair of beams supports the plate along a second axis relative to the second frame so that the plate rotates about the second axis relative to the frame. The first and second axes preferably intersect at a 90° angle. A first actuator provides mechanical force for rotating the second frame relative to the first frame about the first axis. A second actuator provides mechanical force for rotating the plate relative to the second frame about the second axis. Accordingly, the plate can be independently rotated relative to the first axis and the second axis. Related methods are also disclosed.
Abstract:
Microelectromechanical system (MEMS) structures and arrays that provide movement in one, two, and/or three dimensions in response to selective thermal actuation. Significant amounts of scalable displacement are provided. In one embodiment, pairs of thermal arched beams are operably interconnected and thermally actuated to create structures and arrays capable of moving in a plane parallel to the underlying substrate in one and/or two dimensions. One embodiment provides an arched beam operably connected to a crossbeam such that the medial portion arches and alters its separation from the crossbeam when thermally actuated. In another embodiment, at least one thermal arched beam is arched in a nonparallel direction with respect to the plane defined by the underlying substrate. In response to thermal actuation, the medial portion of the arched beam is arched to a greater degree than the end portions of the thermal arched beam, thereby altering the separation of the medial portion from the underlying substrate. One embodiment combines first and second thermal arched beams having medial portions arched in opposed nonparallel directions with respect to the plane defined by the underlying substrate by even greater amounts. In response to thermal actuation, the medial portions thereof arch in opposite nonparallel directions with respect to the underlying substrate, thereby altering the separation of the medial portions from the underlying substrate. Hybrid thermally actuated structures are provided that combine arrays capable of moving in-plane and out of plane, such that motion in all three dimensions may be achieved in response to selective thermal actuation.
Abstract:
An electromechanical device includes a first frame having a first aperture therein, a second frame suspended in the first frame wherein the second frame has a second aperture therein, and a plate suspended in the second aperture. A first pair of beams support the second frame along a first axis relative to the first frame so that the second frame rotates about the first axis. A second pair of beams supports the plate along a second axis relative to the second frame so that the plate rotates about the second axis relative to the frame. The first and second axes preferably intersect at a 90.degree. angle. A first actuator provides mechanical force for rotating the second frame relative to the first frame about the first axis. A second actuator provides mechanical force for rotating the plate relative to the second frame about the second axis. Accordingly, the plate can be independently rotated relative to the first axis and the second axis. Related methods are also disclosed.
Abstract:
A MEMS actuator is provided that produces significant forces and displacements while consuming a reasonable amount of power. The MEMS actuator includes a microelectronic substrate, spaced apart supports on the substrate and a metallic arched beam extending between the spaced apart supports. The MEMS actuator also includes a heater for heating the arched beam to cause further arching of the beam. In order to effectively transfer heat from the heater to the metallic arched beam, the metallic arched beam extends over and is spaced, albeit slightly, from the heater. As such, the MEMS actuator effectively converts the heat generated by the heater into mechanical motion of the metallic arched beam. A family of other MEMS devices, such as relays, switching arrays and valves, are also provided that include one or more MEMS actuators in order to take advantage of its efficient operating characteristics. In addition, a method of fabricating a MEMS actuator is further provided.
Abstract:
A microelectromechanical (MEMS) positioning apparatus is provided that can precisely microposition an object in each of the X, Y and Z directions. The MEMS positioning apparatus includes a reference surface, a support disposed in a fixed position to the reference surface, and a stage defining an XY plane that is suspended adjacent to the support and over at least a portion of the reference surface. The MEMS positioning apparatus also includes at least one and, more typically, several actuators for precisely positioning the stage and, in turn, objects carried by the stage. For example, the MEMS positioning apparatus can include first and second MEMS actuators for moving the stage in the XY plane upon actuation. In addition, the MEMS positioning apparatus can include a Z actuator, such as a thermal bimorph structure, for moving the stage in the Z direction. As such, the MEMS positioning apparatus can precisely position the stage as well as any objects carried by the stage in each of the X, Y and Z directions. As a result of the construction of the MEMS positioning apparatus, the MEMS positioning apparatus can also be fabricated in an affordable, reliable and reproducible manner without compromising the precision alignment provided by the MEMS positioning apparatus.
Abstract:
A micromechanical memory sensor. The sensor comprises a latch member mechanically latching upon detection of a threshold value of a variable condition and circuitry for detecting such latching. A sensor further includes a resetting mechanism for electrically unlatching the latch member whereby the sensor latched purely mechanically is electrically reset for repeat use.