Abstract:
A rotational micro-electro-mechanical structure includes a stator (21), having a plurality of stator electrodes (33, 34), and a rotor (23), which is rotatable with respect to the stator (21) about an axis of relative rotation (A) and has a plurality of rotor electrodes (30), the stator electrodes (33, 34) and the rotor electrodes (30) being comb-fingered; moreover, at least a first group (20a) of stator electrodes (33, 34) and rotor electrodes (30) are parallel to a first plane (P 1 ) that includes the axis of relative rotation (A).
Abstract:
A read/write assembly for magnetic hard disks includes at least: one supporting element (5, 8); one read/write (R/W) transducer (6); one micro-actuator (10), set between the R/W transducer (6) and the supporting element (5, 8); one electrical-connection structure (11) for connection to a remote device carried by the supporting element (5,8) and connected to the R/W transducer (6) and to the micro-actuator (10) In addition, a protective structure (15), set so as to cover the micro-actuator (10) is made of a single piece with the electrical-connection structure (11).
Abstract:
A process for the fabrication of devices that integrate protected microstructures, comprising the following steps: forming, in a body (1) of semiconductor material, at least one microstructure (2) having at least one first portion (3) and one second portion (4) which are relatively mobile with respect to one another and are separated from one another by at least one gap region (14), which is accessible through a face (6) of the body (1); and sealing the gap (14). The sealing step includes depositing on the face (6) of the body (1) a layer (15) of protective material, in such a way as to close the gap region (14), the protective layer being such as to enable relative motion between the first portion (3) and the second portion (4) of the microstructure (2).
Abstract:
Electronic device (1, 1a, 1b, 1c, 1d, 1e) which comprises: - a substrate (2) provided with at least one passing opening (5), - a MEMS device (7) with function of differential sensor provided with a first and a second surface (9, 10) and of the type comprising at lesat one portion (11) sensitive to chemical and/or physical variations of fluids present in correspondence with a first and a second opposed active surface (11a, 11b) thereof, the first surface (9) of the MEMS device (7) leaving the first active surface (11 a) exposed and the second surface (10) being provided with a further opening (12) which exposes said second opposed active surface (11b), the electronic device (1, 1d, 1e) being characterised in that the first surface (9) of the MEMS device (7) faces the substrate (2) and is spaced therefrom by a predetermined distance, the sensitive portion (11) being aligned to the passing opening (5) of the substrate (2), and in that it also comprises - a protective package (14, 14a, 14b), which incorporates at least partially the MEMS device (7) and the substrate (2) so as to leave the first and second opposed active surfaces (11a, 11b) exposed respectively through the passing opening (5) of the substrate (2) and the further opening (12) of the second surface (10).
Abstract:
A manufacturing process of a combined semiconductor accelerometer and pressure-monitoring device (30) is disclosed, envisaging: providing a wafer (31) of semiconductor material; providing, in a first region (34a) of the wafer (31) a first buried cavity (22) and a first membrane (23), suspended over, and closing at the top, the first buried cavity (22); providing, in a second region (34b) of the wafer (31), a second buried cavity (40) and a second membrane (41), suspended over, and closing at the top, the second buried cavity (40); coupling an inertial mass (25) in a rigid way to the first membrane (23), by forming the inertial mass (25) on top of a surface of the first membrane (23) opposite to the first buried cavity (22); providing, in the first membrane (23), first piezoresistive transduction elements (24) sensitive to strains of the first membrane (23) due to movements of the inertial mass (25) in response to a sensed acceleration and generating corresponding electrical signals, so as to provide an acceleration sensor (35); and providing, in the second membrane (41), second piezoresistive transduction elements (42) sensitive to strains of the second membrane (41) in response to a sensed pressure and generating corresponding electrical signals, so as to provide a pressure sensor (36) integrated with the acceleration sensor (35) in the wafer (31). A combined semiconductor accelerometer and pressure-monitoring device (30) is also disclosed, made with the above manufacturing process.
Abstract:
Described herein is an assembly (30) of an integrated device (1) and of a cap (32) coupled to the integrated device; the integrated device (1) is provided with at least a first and a second region (16, 17) to be fluidically accessed from outside, and the cap (32) has an outer portion (32a) provided with at least a first and a second inlet port (35, 36) in fluid communication with the first and second regions (16, 17). In particular, the first and second regions (16, 17) are arranged on a first outer face (20a), or on respective adjacent outer faces (20a, 20c), of the integrated device (1), and an interface structure (38) is set between the integrated device (1) and the outer portion (32a) of the cap (32), and is provided with a channel arrangement (39, 40) for routing the first and second regions (16, 17) towards the first and second inlets (35, 36).
Abstract:
In a substrate-level assembly (22), a device substrate (20) of semiconductor material has a top face (20a) and houses a first integrated device (1), provided with a buried cavity (3), formed within the device substrate (20), and with a membrane (4), suspended over the buried cavity (3) in the proximity of the top face (20a). A capping substrate (21) is mechanically coupled to the device substrate (20) above the top face (20a) so as to cover the first integrated device (1), in such a manner that a first empty space (25) is provided above the membrane (4). Electrical-contact elements (28a, 28b) electrically connect the integrated device (1) with the outside of the substrate-level assembly (22). The device substrate (20) integrates at least a further integrated device (1', 10) provided with a respective membrane (4'); and a further empty space (25'), fluidically isolated from the first empty space (25), is provided over the respective membrane (4') of the further integrated device (1', 10).
Abstract:
In a data-input device (4) an actuator element (6) that can be manually actuated, and a sensor (9) mechanically coupled to the actuator element (6). The sensor (9) is formed in a body (10) of semiconductor material housing a first sensitive element (11), which detects the actuation of the actuator element (6) and generates electrical control signals. The first sensitive element (11) is a microelectromechanical pressure sensor, formed by: a cavity (24) made within the body (10); a diaphragm (25) made in a surface portion of the body (10) and suspended above the cavity (24); and piezoresistive transducer elements (26) integrated in peripheral surface portions of the diaphragm (25) in order to detect its deformations upon actuation of the actuator element (6).
Abstract:
Method for manufacturing a semiconductor pressure sensor, wherein, in a silicon substrate (2), trenches (6a) are dug and delimit walls (7a); a closing layer (10) is epitaxially grown, that closes the trenches (6a) at the top and forms a suspended membrane (13); a heat treatment is performed so as to cause migration of the silicon of the walls (7a) and to form a closed cavity (11) underneath the suspended membrane; and structures (25a, 25b, 26a-26d) are formed for transducing the deflection of the suspended membrane (13) into electrical signals.