Abstract:
The present invention provides an acceleration sensor in which rigidity of its movable electrode can be ensured despite a large number of through-holes formed in the movable electrode. The acceleration sensor has an SOI substrate (2) in which a silicon oxide layer (4) is formed on a silicon support layer (3) and an active silicon layer (5) is formed on the silicon oxide layer, wherein the active silicon layer of the SOI substrate has a movable electrode (11) supported by elastic beams and configured with a weight, and also has fixed electrodes (13a), (13xb), (14ya), (14yb) disposed in a fixed manner around the movable electrode to face the movable electrode, and wherein through-holes (16) penetrating in a Z-axis direction are formed over the entire surface on the inner side of an outer circumference to which the elastic beams (12) of the movable electrode are connected.
Abstract:
A capacitive accelerometer (202) comprises: a substantially planar proof mass (204) mounted to a fixed substrate by flexible support legs (250) so as to be linearly moveable in an in-plane sensing direction (200). The proof mass comprises first and second sets of moveable capacitive electrode fingers. First and second sets of fixed capacitive electrode fingers interdigitates with the first and second sets of moveable electrode fingers respectively (221, 222). A set of moveable damping fingers (224) extend from the proof mass substantially perpendicular to the sensing direction, laterally spaced in the sensing direction. A set of fixed damping fingers (222) mounted to the fixed substrate interdigitates with the set of moveable damping fingers and comprises an electrical connection (260) to the proof mass so that the interdigitated damping fingers (228, 230) are electrically common. The damping fingers are mounted in a gaseous medium that provides a damping effect.
Abstract:
Die Erfindung betrifft einen Inertialsensor (100) mit folgenden Merkmalen: Einem ersten Sensorelement (108), das durch ein Dämpfungselement (116) gegenüber einer Schnittstelle (126) des Inertialsensors (100) schwingungsgedämpft ist, wobei das erste Sensorelement (108) dazu ausgebildet ist, in einem ersten Frequenzband eine erste Messgröße zu erfassen und das Dämpfungselement (116) dazu ausgebildet ist, zumindest in dem ersten Frequenzband Schwingungen zu dämpfen; und einem zweiten Sensorelement (110), das mechanisch mit der Schnittstelle (126) gekoppelt ist, wobei das zweite Sensorelement (110) dazu ausgebildet ist, in einem zweiten Frequenzband eine zweite Messgröße zu erfassen.
Abstract:
A new high G-range damped acceleration sensor is proposed with a proof mass optimized for maximized, bi-directional and symmetrical damping to accommodate acceleration ranges above and beyond several thousand G's. In order to achieve the maximum, bi-directional and symmetrical damping, the high G- range acceleration sensor is designed to have minimum amount of mass in the proof mass while maximizing its surface areas. Such high G-range damped acceleration sensor can be applied to any application in which damping (or suppression of ringing) is desired at quite high frequencies.
Abstract:
PROBLEM TO BE SOLVED: To provide a capacitance type physical quantity sensor of which the reduction in detection accuracy of a physical quantity is suppressed by attitudinal control.SOLUTION: The capacitance type physical quantity sensor includes an anchor (30), a detection beam (20) connected to a substrate via the anchor, a weight part (17) connected to the detection beam, a movable electrode (18) formed on the weight part, and a fixed electrode (19) facing the movable electrode. A first movable detection electrode and a first fixed detection electrode face each other in a first y direction, and a second movable detection electrode and a second fixed detection electrode face each other in a second y direction, and a first movable damping electrode is located at the center between two first fixed damping electrodes and faces one first fixed damping electrode in the first y direction and faces the other first fixed damping electrode in the second y direction, and a plurality of first movable damping electrodes are located point-symmetrically with respect to a center (CP) of the weight part or line-symmetrically with respect to a center line (CL) passing the center and being in the y direction.
Abstract:
PROBLEM TO BE SOLVED: To provide a physical quantity sensor that has a simple configuration and can enhance detection sensitivity.SOLUTION: A physical quantity sensor 100 comprises: a substrate 10; a movable body 20 including, with a first axis Q1 as a boundary, a first movable electrode portion 21 disposed in a first region 20a, a second movable electrode portion 22 disposed in a second region 20b, and a damping adjusting portion 23 disposed in at least one of the first region 20a and the second region 20b; beam portions 30 and 32 supporting the movable body 20; a first fixed electrode portion 50; and a second fixed electrode portion 52. A first through-hole 26 is disposed in the damping adjusting portion 23. Second through-holes 27 and 28 are disposed in the movable electrode portions 21 and 22. The area of a region where the first movable electrode portion 21 overlaps with the first fixed electrode portion 50 is the same as the area of a region where the second movable electrode portion 22 overlaps with the second fixed electrode portion 52. The width of the first through-hole 26 is greater than the widths of the second through-holes 27 and 28.