摘要:
A system and methods for base excitation of moderately high vibration of micro-cantilevers are disclosed. A micro-cantilever may be coupled to one or more actuators adjacent its base. The actuators may comprise bulk materials, bridges, or formed wires that expand and contract by application of electric currents, due to, for example, the effect of electro-thermal heating or piezoelectric effects. Single actuators or an array of actuators may be placed around the micro-cantilever to oscillate it and apply actuation pulses. The system and methods, and adjustments of the geometrical parameters, may be performed to yield a nominal natural frequency in the system. The excitation of actuators with signals corresponding to the natural frequency may induce resonance in the system and may result in high amplitude vibrations and displacement of the cantilever tip of the micro-cantilever. Various architectures of the actuators may be implemented to stimulate different frequencies of the beam and induce displacement in different direction and amplitudes.
摘要:
The invention relates to a device for generating a second temperature variation ΔΤ 2 from a first use temperature variation ΔΤ 1 , comprising an elastocaloric material layer (30), the internal temperature of which is capable of varying from ΔΤ 2 in response to a given variation Δσ in a mechanical stress applied onto said elastocaloric material layer, the given variation Δσ being induced by the first temperature variation ΔΤ 1 , and a suspended element (24) in mechanical contact with the elastocaloric material layer such as to apply, onto said layer, a mechanical stress that varies in response to the use temperature variation ΔΤ 1 . Said suspended element (24) is set up such as to cause variation, from Δσ, in the mechanical stress applied onto the elastocaloric material layer in response to the temperature variation ΔΤ 1 such as to thereby generate the second temperature variation ΔΤ 2 .
摘要:
The MEMS thermal actuator (10) includes a microelectronic substrate (14) having a first surface (26) and at least one anchor structure (18,20) affixed to the first surface (26). A composite beam (12) extends from the anchor(s) (18,20) and overlies the first surface (26) of the substrate (14). The composite beam (12) is adapted for thermal actuation, such that it will controllably deflect along a predetermined path that extends substantially parallel to the first surface (26) of the microelectronic substrate (14). In one embodiment the composite beam (12) comprises two or more layers (28,30) having materials that have correspondingly different thermal coefficients of expansion. An electrically conductive path may extend throughout the composite beam (12) to effectuate thermal actuation. In one embodiment of the invention a two layer composite beam comprises a first layer (28) of a semiconductor material and a second layer (30) of a metallic material. The semiconductor material may be selectively doped during fabrication so as to create a self-contained heating mechanism within the composite beam. The invention also comprises a MEMS thermal actuator that includes two or more composite beams disposed in an array.
摘要:
A microelectromechanical (MEMS) device (10) is provided that includes a microelectronic substrate (50) and a thermally actuated microactuator (20). For example, the MEMS device (10) may be a valve. As such, the valve may include at least one valve plate (30) that is controllably brought into engagement with at least one valve opening (40) in the microelectronic substrate (50) by selective actuation of the microactuator (20). While the MEMS device (10) can include various microactuators (20), the microactuator advantageously includes a pair of spaced apart supports (22) disposed on the substrate (50) and at least one arched beam (24) extending therebetween. The microactuator (20) may further include metallization traces (70) on distal portions (23) of the arched beams (24) to constrain the thermally actuated regions of arched beams to medial portions thereof. The valve may also include a latch (680) for maintaining the valve plate (30) in a desired position without requiring continuous energy input to the microactuator (20).
摘要:
Dispositif microélectromécanique comprenant une structure mécanique (P1) s'étendant principalement selon une direction longitudinale (x), reliée à un substrat planaire (S) par au moins un ancrage (APLM, APLM2) situé à l'une de ses extrémités et susceptible de fléchir dans un plan parallèle au substrat, ladite structure mécanique comprenant une portion de raccord, qui la relie audit ou à chaque dit ancrage et qui inclut une région résistive (R1) présentant une première (PL1M1) et une deuxième (12) zone d'injection d'un courant électrique pour former un transducteur résistif, ladite région résistive s'étendant principalement dans ladite direction longitudinale à partir dudit ou d'un dit ancrage et étant agencée de telle sorte qu'une flexion de ladite structure mécanique dans ledit plan parallèle au substrat induise dans ladite région résistive une contrainte moyenne non nulle et réciproquement; caractérisé en ce que : ladite première zone d'injection est portée par ledit ancrage ; et ladite deuxième zone d'injection est portée par un élément conducteur non fixé audit substrat et s'étendant principalement dans une direction dite latérale, sensiblement perpendiculaire à ladite direction longitudinale.
摘要:
The invention relates to the production of multilayer microcomponents comprising one or more layers, each consisting of a material M chosen from metals, metal alloys, glasses, ceramics and glass-ceramics. The method consists in depositing, on a substrate, one or more layers of an ink P and one or more layers of an ink M, each layer being deposited in a predetermined pattern, each ink layer being at least partially consolidated before deposition of the next layer, in completely consolidating the partially consolidated layers of ink M after their deposition, and in completely or partially removing the material of each of the layers of ink P. An ink P consists of a thermosetting resin containing a mineral filler or of a mixture comprising a mineral material and an organic binder. An ink M consists of a mineral material that is a precursor of the material M and an organic binder. The inks are deposited by casting or by extrusion.
摘要:
A micrometer sized, single-stage, horizontal and vertical thermal actuator capable of repeatable and rapid movement of a micrometer-sized optical device off the surface of a substrate. The horizontal and vertical thermal actuator is constructed on a surface of a substrate. At least one hot arm has a first end anchored to the surface and a free end located above the surface. A cold arm has a first end anchored to the surface and a free end. The cold arm is located above and laterally offset from the hot arm relative to the surface. The cold arm is adapted to provide controlled bending near the first end thereof. A member mechanically and electrically couples the free ends of the hot and cold arms such that the actuator exhibits horizontal and vertical displacement when current is applied to at least the hot arm.
摘要:
A thermal bend actuator ( 6 ) is provided with a group of upper arms ( 23, 25, 26 ) and a group of lower arms ( 27, 28 ) which are non planar, so increasing the stiffness of the arms. The arms ( 23, 25, 26,27,28 ) may be spaced transversely of each other and do not overly each other in plan view, so enabling all arms to be formed by depositing a single layer of arm forming material
摘要:
A microelectromechanical (MEMS) device (10) is provided that includes a microelectronic substrate (50) and a thermally actuated microactuator (20). For example, the MEMS device (10) may be a valve. As such, the valve may include at least one valve plate (30) that is controllably brought into engagement with at least one valve opening (40) in the microelectronic substrate (50) by selective actuation of the microactuator (20). While the MEMS device (10) can include various microactuators (20), the microactuator advantageously includes a pair of spaced apart supports (22) disposed on the substrate (50) and at least one arched beam (24) extending therebetween. The microactuator (20) may further include metallization traces (70) on distal portions (23) of the arched beams (24) to constrain the thermally actuated regions of arched beams to medial portions thereof. The valve may also include a latch (680) for maintaining the valve plate (30) in a desired position without requiring continuous energy input to the microactuator (20).