Abstract:
An accelerometer sensor having electrodes forming capacitors of capacitance that vary as a function of distances between the electrodes, a control unit being arranged to perform an operation of measuring the capacitances and a control operation that comprises selectively: a fine control stage in which a first voltage is applied between one of the stationary electrodes and the movable electrode, while the other stationary electrode is at the same potential as the movable electrode; and an extended control stage in which a second voltage is applied between one of the stationary electrodes and the movable electrode, the other stationary electrode being at the same potential as the movable electrode, and the second voltage being greater in absolute value than the first voltage.A method using such a sensor.
Abstract:
A resonant sensor includes a mover that is movable in a first direction, a supporter that extends in a second direction perpendicular to the first direction, the supporter being connected to the mover and a fixer, the supporter supporting the mover which is movable in the first direction, and a resonator that is vibratable, at least a part of the resonator being embedded in the supporter.
Abstract:
An acceleration sensor includes a fixation member, a weight member including a plate with two opposing sides parallel or substantially parallel to an X-direction and two opposing sides parallel to a Y-axis direction in a plan view, the weight member including a cutout extending in a direction about 45° relative to the X and Y axis directions, a vibrating beam linearly extending in the direction about 45° relative to the X and Y axis directions in the plan view, and one end portion is connected to the fixation member and the other end portion is connected to the weight member, the vibrating beam is partly arranged within the cutout and supporting the weight member to be displaceable in a Z-axis direction, a driver disposed on the vibrating beam and vibrating the vibrating beam, and a detector disposed on the vibrating beam and outputting a detection signal that is changed depending on deformation of the vibrating beam.
Abstract:
An electromechanical device and method of fabrication thereof comprising: providing a first wafer with a circuit arrangement on a first surface thereof and a first electrode on a second surface thereof; forming first and second via structures from the first surface to the second surface of the first wafer, said first via electrically connecting the first electrode with the circuit arrangement; providing a second wafer with a suspended structure on a first surface thereof; forming a second electrode on the suspended structure; forming an interconnect structure on the first surface of the second wafer that electrically connects with the second electrode; bonding the first wafer to the second wafer with the second surface of the first wafer facing the first surface of the second wafer, with the second via structure electrically connecting the circuit arrangement to the interconnect structure, and the first and second electrodes forming a capacitive structure.
Abstract:
An accelerometer for sensing acceleration along a sensing axis, includes a flexure member (having a pendulum member pivotably connected to a support member via a hinge arrangement), a housing, and at least one mounting structure configured for clamping the support member to the housing in load bearing contact while concurrently allowing for differential movement between the support member and the housing. Embodiments also include a corresponding housing member for use with a flexure member of an accelerometer, and a flexure member for use with a housing of an accelerometer.
Abstract:
A physical quantity detection device includes: a base portion; a movable portion supported by the base portion via a joint and shifting in accordance with a change of a physical quantity; a physical quantity detection element extending over the base portion and the movable portion; a first support member extending from the base portion and having a first fixing portion; and a second support member extending from the base portion and having a second fixing portion. The distance between the first fixing portion and the second fixing portion is shorter than the distance between the root of the first support member at the junction with the base portion and the root of the second support member at the junction with the base portion.
Abstract:
The manufacturing of an element structure including two or more sensor element is to be facilitated. An element structure includes a first substrate including a first support layer and a first sensor element disposed on the first support layer and a second substrate including a second support layer and a second sensor element disposed on the second support layer, wherein the second substrate is disposed on the first substrate via a spacer member in a state in which the first sensor element and the second sensor element are disposed to face each other.
Abstract:
The invention relates to a capacitive micromechanical acceleration sensor comprising a first sensor, a second sensor, and a third sensor. The first sensor comprises a rotor electrode and stator electrode. The sensor comprises a first beam that is connected to a rotor electrode support structure and that is connected to the rotor electrode. The sensor comprises a second beam that is connected to the rotor electrode support structure and that is connected to the rotor electrode. The second sensor is situated in a first space circumscribed by the first beam, the first sensor, and the rotor electrode support structure. The third sensor is situated in a second space circumscribed by the second beam, the first sensor, and the rotor electrode support structure.
Abstract:
A physical quantity detection device includes: a base; a movable portion, provided in the base through a coupling portion, which is displaced in accordance with a change in a physical quantity; a physical quantity detection element which is fixed across the base and the movable portion; and a mass portion which is fixed to the movable portion, wherein the movable portion includes a first fixing portion to which the physical quantity detection element is fixed, a second fixing portion to which the mass portion is fixed, and a notch having a notched shape which is separated from the coupling portion, and reaches from a lateral side of the movable portion to a place intersecting a line that links the first fixing portion to the second fixing portion.
Abstract:
One embodiment of the invention includes an accelerometer sensor system. The system includes a sensor comprising a proofmass and electrodes and being configured to generate acceleration feedback signals based on control signals applied to the electrodes in response to an input acceleration. The system also includes an acceleration component configured to measure the input acceleration based on the acceleration feedback signals. The system further includes an acceleration controller configured to generate the control signals to define a first scale-factor range associated with the sensor and to define a second scale-factor range associated with the sensor. The control system includes a calibration component configured to calibrate the accelerometer sensor system with respect to range-dependent bias error based on a difference between the measured input acceleration at each of the first scale-factor range and the second scale-factor range.