Abstract:
A sensor element includes a piezoelectric substrate made of a trigonal single crystal and an electrode arranged on the piezoelectric substrate. The substrate surface of the piezoelectric substrate includes an electrical axis of crystal axes. An angle θ formed by the substrate surface and a plane including the electrical axis and an optical axis of the crystal axes is 0°
Abstract:
A mirror driving device is provided. A pair of piezoelectric actuator units are disposed at both sides of a mirror unit so as to sandwich the mirror unit, and each piezoelectric actuator unit is connected with an end portion of the mirror unit through a linking unit. The linking unit has a structure including one or more plate-shaped members whose longitudinal direction is a direction perpendicular to a rotation axis, and functions as a plate-shaped hinge unit in which a plate-shaped member is deformed so as to be deflected in the thickness direction by the drive of the piezoelectric actuator unit. The linking unit is provided with a sensor unit that detects the stress to be generated in the linking unit during the rotational drive of the mirror unit by a resonant vibration.
Abstract:
A strain sensor includes a package to be connected to a strain generating body, a detector configured to convert a mechanical strain of the strain generating body into an electric signal and output the electric signal, and a processor chip connected to an upper surface of the package and separated from a detector. A recess is provided in the upper surface of the package. The detector is accommodated in the recess and joined to the recess. This strain sensor can have a small size.
Abstract:
In an electronic apparatus equipped with a mechanism for generating a sound and an oscillation, it is possible to detect an imparted shock with high sensitivity. The electronic apparatus includes: an oscillation unit; a piezoelectric element configured to impart an oscillation due to deformation in correspondence with an applied voltage to the oscillation unit, generating a voltage corresponding to deformation due to a shock imparted to the oscillation unit; an induction element for applying an increased voltage to the piezoelectric element; a first switch performing control as to whether or not to supply an electric current from a power source to the induction element; a second switch for effecting connection or disconnection between the induction element and the piezoelectric element; and a shock detection unit configured to detect a shock imparted to the oscillation unit based on the voltage generated in the piezoelectric element.
Abstract:
A sensor for measuring pressure and/or force comprises at least one measuring assembly having at least one piezoelectric measuring element (2) subjected to compressive stress for dynamic pressure and/or force measurement, and a diaphragm (3) for introducing the pressure and/or the force onto at least the piezoelectric measuring element.So as to provide a further embodiment of a sensor for pressure or force measurement as indicated, which allows improved detection of static and dynamic effects, a further measuring assembly (4, 7) that is based on a different physical measuring principle for static pressure and/or force measurement is proposed for this sensor.
Abstract:
An oscillation piece includes a first oscillation arm and a second oscillation arm, a first base that connects ends of the first oscillation arm and the second oscillation arm on one side to each other and a second base that connects ends of the first oscillation arm and the second oscillation arm on the other side to each other, and weight films provided on each of the first oscillation arm and the second oscillation arm. The drive electrodes are disposed in positions where the amount of distortion produced in the first oscillation arm and the second oscillation arm is maximized, and the weight films are disposed in positions where the amount of distortion produced in the first oscillation arm and the second oscillation arm is minimized. The oscillation frequency of the oscillation piece can be precisely adjusted by removing part of the weight films.
Abstract:
A device for acquiring mechanical loads on mechanically loaded bodies is provided. The device exhibits a resonance-capable micro-bridge structure, an alternating voltage source with a variable frequency, an impedance measuring device for acquiring the impedance of the micro-bridge structure and an electronic unit for receiving determined impedance values and changing the frequency of the alternating voltage source. By exciting the micro-bridge structure and measuring its impedance, a conclusion can be drawn as to the expansion-dependent resonance frequency, which in return makes it possible to determine the expansion, and hence the mechanical load. Such a device is sufficiently accurate, and largely independent of outside influences.
Abstract:
In an external force detection apparatus, a crystal plate is cantilevered within a container. Excitation electrodes are formed on the top surface and the bottom surface of the crystal plate. A movable electrode is formed on a distal end on the bottom surface of the crystal plate and is connected to the excitation electrode on the bottom surface via an extraction electrode. A fixed electrode is provided on the bottom of the container to oppose the movable electrode. The excitation electrode on the top surface and the fixed electrode are connected to an oscillating circuit. When an external force acts on the crystal plate to bend it, the capacitance between the movable electrode and the fixed electrode changes, and this capacitance change is captured as a change in the oscillating frequency of the crystal plate.
Abstract:
A micro-force sensor comprising a one-piece plate including a first area defining a first recess, which must be held in position relative to a mounting, a second area connected to the first area defining the first recess and a second recess, a measuring beam across the first recess having a first end embedded in the first area and a second end connected to the second area, an excitation beam across the second recess having two ends embedded in the second area and being provided with at least one excitation element, a third area connected to the first area and an effector beam having one free end for receiving the force being measured and one end-embedded in the third area, and a fourth area connecting the embedded end of the effector beam to the second end of the measuring beam, which is provided with a measuring element.
Abstract:
A vibrator element includes: a base portion; a vibrating arm that extends in a first direction from the base portion, has a width in a second direction perpendicular to the first direction in the plan view, and has a thickness in a third direction perpendicular to the first direction and the second direction; and an inter digital transducer, in which electrode fingers are arranged in the first direction, disposed at least one of a first surface, which is perpendicular to the third direction, and a second surface, which faces the first surface, of the vibrating arm, wherein the vibrating arm is vibrated in the third direction by stretching or contacting the vibrating arm in the first direction by using an electric field in the first direction that is generated by the inter digital transducer.