Abstract:
A method of reactive ion etching a substrate 46 to form at least a first and a second etched feature (42, 44) is disclosed. The first etched feature (42) has a greater aspect ratio (depth:width) than the second etched feature (44). In a first etching stage the substrate (46) is etched so as to etch only said first feature (42) to a predetermined depth. Thereafter in a second etching stage, the substrate (46) is etched so as to etch both said first and said second features (42, 44) to a respective depth. A mask (40) may be applied to define apertures corresponding in shape to the features (42, 44). The region of the substrate (46) in which the second etched feature (44) is to be produced is selectively masked with a second maskant (50) during the first etching stage. The second maskant (50) is then removed prior to the second etching stage.
Abstract:
Methods of measuring displacement of a movable mass in a microelectromechanical system (MEMS) include driving the mass against two displacement-stopping surfaces and measuring corresponding differential capacitances of sensing capacitors such as combs. A MEMS device having displacement-stopping surfaces is described. Such a MEMS device can be used in a method of measuring properties of an atomic force microscope (AFM) having a cantilever and a deflection sensor, or in a temperature sensor having a displacement-sensing unit for sensing a movable mass permitted to vibrate along a displacement axis. A motion-measuring device can include pairs of accelerometers and gyroscopes driven 90° out of phase.
Abstract:
The MEMS device has a suspended mass (31) supported via a pair of articulation arms (32) by a supporting region (33). An electrostatic driving system (36), coupled to the articulation arms (32), has mobile electrodes (38) and fixed electrodes (39) that are coupled to each other. The electrostatic driving system is formed by two pairs of actuation assemblies (36), arranged on opposite sides of a respective articulation arm (32) and connected to the articulation arm through connection elements (30). Each actuation assembly (36) extends laterally to the suspended mass (31) and has an auxiliary arm (37) carrying a respective plurality of mobile electrodes (38). Each auxiliary arm is parallel to the articulation arms (32). The connection elements (30) may be rigid or formed by linkages.
Abstract:
The invention relates to a method for producing a micromechanical component (300) that comprises providing a first substrate (100), forming a microstructure (150) on the first substrate (100), wherein the microstructure (150) comprises a moving function element (151), providing a second substrate (200), and forming in the second substrate (200) an electrode (251) for capacitively measuring a deflection of the function element (151). The method further comprises connecting the first and the second substrates (100; 200), wherein a closed cavity which encloses the function element (151) is formed, and wherein the electrode (251) adjoins the cavity in an area of the function element (151).
Abstract:
There has been a trade-off between the rigidity and the mass of a movable section of a microactuator, and also between the rigidity of the movable section and the electrostatic force. A microactuator 100 includes: a base 1; a first comb electrode 2 supported by the base 1; a movable section 6 having a second comb electrode 8 opposing the first comb electrode 2, and at least one reinforcement rib 9 protruding toward the base 1; and an elastic supporting member 3 for supporting the movable section 6 so as to allow the movable section 6 to be displaced with respect to the base 1. The height of the second comb electrode 8 is different from the height of the at least one reinforcement rib 9.
Abstract:
Actuator apparatus comprising at least one moving elements, each comprising comb drive apparatus including at least first and second comb elements at least one of which is free to be in motion in a medium, and a controller controlling the motion responsive to an input signal representing a desired sound.
Abstract:
A micro movable device suitable for suppressing deterioration of driving characteristics, and a micro movable device array including such a micro movable device are provided. The micro movable device (X1) of the present invention includes a movable portion including a first driving electrode, a second driving electrode for generating electrostatic attraction between the first driving electrode and the second driving electrode, a first conductor portion (22c) electrically connected to the first driving electrode, a second conductor portion (22b) electrically connected to the second driving electrode, and a third conductor portion (21a) which is not electrically connected to the first and the second driving electrodes and which is bonded to the first conductor portion (22c) via an insulating film (23) and bonded to the second conductor portion (22b) via the insulating film (23).