170 results about "Quartz resonator" patented technology

Embodiments of the present invention are directed to apparatuses and methods of making a micromachined resonator gyroscope, e.g. a disc resonator gyro (DRG), including one or more of the following novel features. Embodiments of the invention may comprise a triple-wafer stack gyroscope with an all fused quartz (or all silicon) construction for an electrical baseplate, resonator and vacuum cap. This can yield superior thermal stability over prior art designs. A typical resonator embodiment may include a centrally anchored disc with high aspect-ratio in-plane electrostatic drive and sense electrodes to create large capacitance. A silicon sacrificial layer may be employed for attaching a quartz resonator wafer to a quartz handle wafer for high aspect-ratio etching. In addition, embodiments of the invention may comprise a low thermal stress, wafer-level vacuum packaged gyroscope with on-chip getter. An ultra-thin conductive layer deposited on the quartz resonator may also be utilized for high Q.

PCT No. PCT/JP97/03807 Sec. 371 Date Dec. 21, 1998 Sec. 102(e) Date Dec. 21, 1998 PCT Filed Oct. 22, 1997 PCT Pub. No. WO98/38736 PCT Pub. Date Sep. 3, 1998In a piezoelectric vibrator which has excitation electrodes respectively disposed on the top surface and undersurface of a piezoelectric substrate, at least one of the excitation electrodes being an inverted-mesa electrode that has a recess formed in the opposite side of the electrode from the side which contacts the piezoelectric substrate. Thus, an AT-cut quartz resonator in which the capacitance ratio gamma is reduced to a value below the limit value can be provided as a result of use of the inverted-mesa electrodes as excitation electrodes.

There is disclosed a wristwatch having a case containing a mechanical watch movement (10) driven by a spring barrel (14) and provided with a mechanical regulator with a balance and balance-spring, which is associated, via electromagnetic coupling, with an electronic regulator driven by a quartz resonator. The rim of the balance (13) is provided with a pair of permanent magnets (38, 39). The electronic regulator includes a fixed coil (12) arranged for cooperating with said magnets via electromagnetic coupling, a rectifier (58) provided with at least one capacitor, and a circuit (60) for enslaving the frequency of the mechanical regulator to the frequency of the oscillator by braking obtained by briefly short-circuiting the coil. In order to enable a common type of mechanical movement to be used, only the balance of which is altered, the electronic regulator is formed by a structural module (11) that is entirely separate from the mechanical watch movement (10). This module can be fixed to the movement plate, or, conversely, carried by the watchcase independently of said movement, in particular via a casing ring (26). Apart from the coil, all of the rest of the electronic module (11) is preferably located outside the mechanical movement.

A method for manufacturing a resonator is presented in the present application. The method includes providing a handle substrate, providing a host substrate, providing a quartz substrate comprising a first surface opposite a second surface, applying interposer film to the first surface of the quartz substrate, bonding the quartz substrate to the handle substrate wherein the interposer film is disposed between the quartz substrate and the handle substrate, thinning the second surface of the quartz substrate, removing a portion of the bonded quartz substrate to expose a portion of the interposer film, bonding the quartz substrate to the host substrate, and removing the handle substrate and the interposer film, thereby releasing the quartz substrate.

Disclosed is an oscillator that relies on redundancy of similar resonators integrated on chip in order to fulfill the requirement of one single quartz resonator. The immediate benefit of that approach compared to quartz technology is the monolithic integration of the reference signal function, implying smaller devices as well as cost and power savings.

A resonator package includes a quartz resonator and a heating element within a sealed housing, wherein the heating element is thermally coupled to an external wall of the housing. The heated external wall of the housing is thermally coupled to a substrate to heat a local region of the substrate. The heated local region of the substrate thermally stabilizes an associated oscillator control circuit and heater control circuit which are external to the housing.

An apparatus and procedure for passively performing a geophysical survey. The RAP Equipment complex comprises an A/D Conversion Device, an external sensor, an external 12 volt battery, and a Notebook Computer in which resides a Fourier analysis program. The A/D Conversion Device is connected to the serial port of the Notebook Computer. The A/D Conversion Device comprises an Analog/Digital Converter modified to replace its quartz resonator with a Frequency Generator for providing a predetermined sampling rate, and a Signal Amplifier. An external sensor is attached by a cable to the input of the Signal Amplifier. A 12 volt power supply powers the Signal Amplifier, the modified A/D converter, and the Notebook Computer. In use, the external sensor is placed on the ground at the first spot it is desired to take a reading. The ground is then lightly tapped in the near vicinity of the sensor either with one's finger or a hammer. This tap causes the natural vibrations within the subsurface layers to be amplified. The sensor picks up these vibrations from the resonating layers, passes them on to the Signal Amplifier which in turn amplifies these signals and passes them on to the A/D Conversion Device. The A/D conversion Device converts these acoustical signals from analog form to digital form and passes them on to the serial port of the Notebook Computer which in turn creates a file of these digital signals.

There is provided a resonance circuit using piezoelectric vibrator such as a quartz resonator, a coil, a capacitor, or an element equivalent to them in combination. When two resonance circuits having different resonance frequencies are combined, it is possible to configure an oscillation circuit and a filter capable of freely adjusting the frequency characteristic by utilizing the phenomenon that by changing the excitation current or voltage of the respective resonance circuits independently from each other, antiresonance frequency of the entire composite resonance circuit can be changed.

The invention relates to a gas sensor, in particular to a quartz crystal resonator which is sensitive to ethanol, and preparation and application thereof, comprising an AT-cut quartz wafer and a gold electrode fixed on the quartz wafer, wherein, the outer surface of the gold electrode and/or the quartz wafer is coated with an ionic liquid membrane. The resonator is applied to a conventional QCM sensor to prepare a QCM ethanol gas sensor, and the operation principle is the quartz crystal microbalance technology; the response frequency of the sensor is reduced with the fractional increase of the surface quality of the resonator caused by the absorption of the ethanol gas on the surface of a sensitive membrane of the quartz resonator, and the reduced value of the frequency and the concentration of the ethanol gas are linear. The gas sensor has the advantages of simple structure, small size, fast and real-time response, high sensitivity, good selectivity, no need of analog to digital conversion for the output of frequency signals, convenient batch production and the like, and is particularly suitable for measuring the concentration of the ethanol gas in the air in real time.

A RF field sensor in which a magnetostrictive film is deposited on one or more electrodes of one or more quartz resonator(s) in which an electric field of the RF field is detected along one axis of the RF field sensor and a magnetic field of the RF field is detected along an orthogonal axis of the RF field sensor simultaneously.

The quartz resonator (1 and 51) is provided with a structure which is integrally airtight-connected with upper-side and lower-side substrates (3, 4, 53 and 54) which are overlapped on the upper surface and the lower surface of a middle quartz plate (2 and 52) integrally forming a quartz resonator sheet (5 and 55) and a housing (6 and 56). The upper-side and lower-side substrates are respectively provided with a concave part on a surface facing to the middle quartz plate so as to form cavities (16 and 66) for airtight sealing the quartz resonator sheet in a suspension state. The upper and lower connection surface of the middle quartz plate forms a conductive film (9 and 11) after being grinded and processed at the lens surface. Each connection surface of the upper-side and lower-side substrates consists of bare quartz surfaces which are grinded and processed at the lens surface. In another embodiment, a metal film (67 to 69) is formed on each connection surface of the upper-side and lower-side substrates consists of bare quartz surfaces which are grinded and processed at the lens surface. The upper-side and lower-side substrates and the middle quartz plate are all or one by one overlapped with each other and are then pressurized at room temperature (heated optionally) after whose connection surfaces are surface-activated through plasma processes, so as to be airtight-connected with each other, thereby sealing the cavities in a vacuum or idle gas atmosphere.

An AT-cut quartz plate having chamfered ridge portions and an almost rectangular shape in planar view, wherein a resonance frequency is equal to or larger than 7 MHz and equal to or smaller than 9 MHz, lengths of long and short sides of the rectangular shape are equal to or larger than 1.5 mm and equal to or smaller than 2.4 mm, and equal to or larger than a frequency difference between primary vibration and sub-vibration is equal to or larger than 975 kHz and equal to or smaller than 1,015 kHz.

An object of the present invention is to provide a Langevin type quartz sensor which is high in measurement sensitivity, suppresses the influence of the surface tension of a sample solution during measurement, and enables an installed quartz resonator to stably oscillate. As a specific means to solve the problem, a quartz sensor including a housing area forming portion surrounding the upper space on one face side of the quartz resonator for forming a housing area of the sample solution; an opposing surface portion opposing to one surface side of the quartz resonator via the housing area and being larger than the area coming in contact with the sample solution in the quartz resonator; and a pouring opening formed in the outside area of the opposing surface portion and at a position higher than said opposing surface potion for pouring the sample solution into the housing area is composed and measurement is conducted in a standstill state where the sample solution is filled in the lower side of the opposing surface portion. Since stress due to the surface tension of the sample solution does not act in this state, the quartz resonator can oscillate with reliability. Therefore, the quartz sensor of the present invention can reduced the thickness of the quartz resonator, which realizes highly sensitive and highly accurate measurement.

A disk resonator gyroscope includes a quartz base, a quartz resonator disk having a central pillar connected to the base, the quartz resonator disk having a surface facing the base and having plurality of circumferential slots in the surface of the quartz resonator disk around the central pillar, and an electrode comprised of quartz and connected to the base outside of an outer edge of the resonator disk.

A resonator assembly comprising a semiconductor substrate, a resonator gyroscope, the resonator gyroscope including a first resonator formed in a layer of a first material, and an oscillator on the semiconductor substrate, the oscillator including a second resonator formed of a second material, wherein the second resonator is attached in a cavity; the cavity comprising a first recess in said layer of a first material and the edges of the first recess being attached to the substrate, or the cavity comprising a second recess in said substrate and the edges of the second recess being attached to said layer of a first material.

An object of the present invention is to avoid the instability of frequency measurement caused by spatial connection between quartz sensor adjacent to each other when a plurality of quartz sensors including a quartz resonator which varies the national frequency due to adsorption of an object to be detected. As a concrete means for solving the problem is to provide a common measuring unit 200 to measure the variation in frequency to each oscillation circuit 51 corresponding to each quartz sensor 1 so as to switchover and connect in turn, and as for the oscillation circuits 51 excepting the oscillation circuits 51 connected to the measuring unit 200 by the switches 52 serving as the load switchover unit, the load value on the output side of the oscillation circuit 51 included (relating to the measurement) in the channels connected to the measuring unit 200 and the load value on the output side of the standby oscillation circuits 51 are made different from each other, so that the respective oscillating frequencies are forcibly separated from each other.

To provide a method of manufacturing a quartz resonator element having a small CI value, a quartz resonator element manufactured by this method, a quartz resonator, and a quartz oscillator.

In a method of manufacturing a quartz resonator element in which on a surface of a plate-shaped quartz piece, a thin film-shaped electrode in order to excite the quartz piece is provided, a first metal layer that is composed of chromium and whose thickness is not less than 20 Å nor more than 45 Å is formed on the surface of the quartz piece (P4), and next, a second metal layer that is composed of gold or silver and whose thickness is not less than 500 Å nor more than 950 Å is formed on an upper surface of the first metal layer (P5), and then, the electrode made up of the first metal layer and the second metal layer is provided (P6). Thereafter, a quartz substrate on which the electrode is formed is heated at a temperature range of not less than 200° C. nor more than 400° C., and the chromium composing the first metal layer is diffused into the second metal layer (P7).