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| Number | Title | Issue Date |
| 8132459 | System and method to determine mechanical resonance of an accelerometer Systems and methods are provided for determining mechanical resonance of a sensor. In one embodiment, a system is provided that comprises a bias voltage source configured to apply a bias voltage impulse signal to a terminal of the sensor and a zero crossing detector... | 03/13/2012 |
| 7954377 | Acceleration sensor incorporating a piezoelectric device An acceleration sensor includes: a piezoelectric vibration device; an oscillation circuit; and a detection circuit, wherein the piezoelectric vibration device includes a substrate, an insulation layer formed above the substrate, a vibration section forming layer for... | 06/07/2011 |
| 7950282 | Acceleration sensor incorporating a piezoelectric device An acceleration sensor includes: a piezoelectric vibration device; an oscillation circuit; and a detection circuit, wherein the piezoelectric vibration device includes a substrate, an insulation layer formed above the substrate, a vibration section forming layer for... | 05/31/2011 |
| 7942055 | Acceleration sensor Disclosed is an acceleration sensor having a small variation in detection sensitivity, in which one end portion of an oscillation detecting element is fixed so that the free length thereof does not vary. Supporting resins 4a, 4b are forme... | 05/17/2011 |
| 7849744 | Driving device, physical quantity measurement device, and electronic instrument An oscillation driver circuit includes a gain control amplifier which causes a vibrator to produce driving vibrations by controlling an oscillation amplitude in an oscillation loop, and a comparator which generates a synchronous detection reference signal based on a... | 12/14/2010 |
| 7849745 | Ultra-low noise MEMS piezoelectric accelerometers Sensing structures are provided which are designed using non-conventional designs. These sensing structures have improved sensitivity and noise floor at low frequencies. ... | 12/14/2010 |
| 7716985 | Piezoelectric quartz accelerometer A piezoelectric quartz accelerometer includes a sensitive element, a signal processing circuit, a base, an outer case, and a socket, wherein the sensitive element includes two round piezoelectric quartz wafers, and a supporting frame, wherein the two round piezoelec... | 05/18/2010 |
| 7624639 | Acceleration sensor An acceleration sensor includes a detection element having a plurality of piezoelectric ceramic layers laminated together and a pair of retaining members that retain an end portion of the detection element in a longitudinal direction thereof at two principal surface... | 12/01/2009 |
| 7437260 | Concept of compensating for piezo influences on integrated circuitry A semiconductor chip includes a first functional element having a first electronic functional-element parameter exhibiting a dependence relating to the mechanical stress present in the semiconductor circuit chip, and being configured to provide a first output signal... | 10/14/2008 |
| 7406948 | Internal combustion engine controller An engine ECU executes a program including: the step of outputting a fuel-cut instruction when conditions that an accelerator position PA is not higher than a threshold value and a rate of increase DNE of engine speed NE is not lower than a determination value DNE( | 08/05/2008 |
| 7371601 | Piezoresistive sensing structure A technique for manufacturing a piezoresistive sensing structure includes a number of process steps. Initially, a piezoresistive element is implanted into a first side of an assembly that includes a semiconductor material. A passivation layer is then formed on the f... | 05/13/2008 |
| 7363814 | Multi-axial angular velocity sensor An angular velocity sensor for detecting angular velocity about a Z-axis in an XYZ coordinate system has a substrate oscillator, a flexible member for connecting the oscillator to a casing, a device for oscillating the oscillator in an X-axis direction, and a detect... | 04/29/2008 |
| 7360455 | Force detector and acceleration detector and method of manufacturing the same An electrode layer is formed on the upper surface of a first substrate, and a processing for partially removing the substrate is carried out in order to allow the substrate to have flexibility. To the lower surface of the first substrate, a second substrate is conne... | 04/22/2008 |
| 7359818 | Sensor apparatus, control system having the same and offset correction method Each acceleration sensor of an air bag system includes a sensing device, a communication device and an adjusting device. The sensing device generates a measurement signal, which indicates a measurement value of acceleration. The communication device performs two-way... | 04/15/2008 |
| 7353707 | Acceleration sensor An acceleration sensor in which a difference in resonance characteristics between two resonators can be easily adjusted even when casing components are already attached to an acceleration-sensor element includes a bimorph acceleration-sensor element having first and... | 04/08/2008 |
| 7350424 | Acceleration sensor A low-cost breakable inertial threshold sensor using mainly micro-machining silicon technology constructed on a silicon-wafer or on some other brittle material according to the MEMS process. The sensor comprises a first body portion, a second body portion, and detec... | 04/01/2008 |
| 7343802 | Dynamic-quantity sensor A piezoelectric-vibrator series circuit including two series-connected piezoelectric vibrators to which stresses induced by a dynamic quantity are applied in opposite directions is used, and a Colpitts oscillator circuit is defined by the piezoelectric-vibrator seri... | 03/18/2008 |
| 7325455 | High-temperature piezoelectric vibration sensor assembly An integral connectorless hermetically sealed high-temperature piezoelectric sensor housing and cable assembly includes signal conditioning/processing circuitry having a charge amplifier-differential amplifier combination with integral trim capacitor and/or a voltag... | 02/05/2008 |
| 7322241 | Acceleration sensor with redundant contact holes An acceleration sensor includes a mass and a supporting member linked by a flexible beam. A strain detector having low-resistance areas at both ends is formed near a boundary between the beam and the mass or between the beam and the supporting member. A dielectric f... | 01/29/2008 |
| 7299695 | Acceleration sensor An acceleration sensor includes a weight and a vibrator that supports the weight at its center of gravity. When acceleration is applied to the weight, stress equivalent to the applied acceleration is generated in the vibrator. As the vibrator is arranged to support ... | 11/27/2007 |
| 7301721 | Falling sensor and the information processing device making use of it A falling sensor is provided, which detects a falling of a magnetic disk drive or an information processing device installed with said magnetic disk drive and which is effective for avoiding physical damages of magnetic heads and magnetic disk media. The magnetic di... | 11/27/2007 |
| 7291825 | Capacitance type physical quantity sensor The capacitance type physical quantity sensor has a sensing part including a capacitor element generating a capacitance signal representing a magnitude of a physical quantity to be sensed, and a sensor circuit including a charge amplifier converting the capacitance ... | 11/06/2007 |
| 7290437 | Sensor node for impact detection The invention is intended to provide a technique regarding sensor nodes for impact detection to enable the intensities of impacts to be determined in a multi-value or analog mode and to reduce the power consumption of sensor nodes. The sensor node is provided with a... | 11/06/2007 |
| 7280808 | Wireless communications devices including circuit substrates with partially overlapping conductors thereon coupling power to/from power amplifier systems A wireless communications device can include a power amplifier that is configured to transmit information to a wireless communications network during a first time interval and configured to avoid transmitting information during a second time interval. A circuit subs... | 10/09/2007 |
| 7275412 | Drop shock measurement system and acceleration sensor element used in the same The drop impact measuring system has i) a plurality of bimorph-type acceleration sensor containing a plurality of free vibrating sections each of which has individual draw-out electrodes; ii) a switch section for selecting output from the bimorph-type acceleration s... | 10/02/2007 |
| 7276291 | Transparent conductive articles and methods of making same An electronic device on a plastic substrate, at least one side of the device being protected from reaction with or incorporation of moisture by a composite barrier. The composite barrier may contain, for example, multiple layers of transparent conductive oxide separ... | 10/02/2007 |
| 7267003 | Acceleration sensor unit An acceleration sensor unit including a board on which an acceleration sensor is mounted, a support part for supporting the board, and a housing in which the support part and the acceleration sensor are contained, the board is installed in the housing by means of th... | 09/11/2007 |
| 7243546 | Acceleration sensor chip An acceleration sensor chip has a frame portion having a frame body portion and protruding portions. The acceleration sensor chip also includes a mobile structure having a central weight portion supported movably by four beam portions. The mobile structure also has ... | 07/17/2007 |
| 7245062 | Device for converting mechanical energy into electrical energy An apparatus for conversion of mechanical energy to electrical energy having a piezo transducer (1), which is formed from two or more layers, and having a mass/spring system (2, 3, 4), which can oscillate, in a holder (5), which is caused (6 | 07/17/2007 |
| 7243544 | Passive and wireless acoustic wave accelerometer An acoustic wave acceleration sensor comprises an acoustic wave device including a plate that functions as a propagation medium and at least one interdigital transducer configured upon the plate. One or more antennas can be integrated with the acoustic wave device, ... | 07/17/2007 |
| 7231802 | Apparatus for detecting a physical quantity acting as an external force and method for testing and manufacturing the apparatus A sensor comprises a semiconductor pellet (10) including a working portion (11) adapted to undergo action of a force, a fixed portion (13) fixed on the sensor body, and a flexible portion (13) having flexibility formed therebetween, a wor... | 06/19/2007 |
| 7219550 | Piezoelectric accelerometer A piezoelectric accelerometer comprising a housing with two complementary parts (2005, 2006) in which a metal mass (2002) and an abutting piezoelectric element (2003) movably mounted in place are sandwiched between two conductive contact element... | 05/22/2007 |
| 7219561 | Force-detecting device Forces and moments are detected in a distinguishing manner by a simple structure. A supporting member (20) is positioned below a force receiving member (10), which receives forces to be detected, and between these components, four columnar force transm... | 05/22/2007 |
| 7216542 | Three-component piezoelectric vibration accelerometer provided with a sensor The inventive device comprises a piezo element, embodied in the form of a square based rectangular parallelopiped fixed to a substrate. A piezo module matrix is embodied in a given shape. A conductive layer is made of a conductive glue. The edges of said rectangular... | 05/15/2007 |
| 7204145 | Activity monitoring An activity monitor is provided that corrects for the effects of motion external to the entity being monitored. For example, the activity monitor can overcome the effects of vehicular travel. ... | 04/17/2007 |
| 7202591 | Electrostrictive compound actuator The present invention presents a system for a compound actuator. The system includes first and second electrode layers each including two electrode sections, an intermediate electrode layer between the first and second electrode layers, and first and second electros... | 04/10/2007 |
| 7196261 | Electronic percussion instrument for producing sound at intended loudness and electronic percussion system using the same An electronic drum includes a pad to be beaten with sticks, a circular piezoelectric converter for converting stress to an electric signal and a semi-circular filter element adhered at one surface to the pad and at the other surface to the circular piezoelectric con... | 03/27/2007 |
| 7196456 | Piezoelectric actuator and method of manufacture therefor, and ink jet head and ink jet type recording device A piezoelectric actuator 21 has: a piezoelectric actuator part 22 made up of a common electrode 27, a piezoelectric element 29, and an individual electrode 33; an electrical interconnection joint part 43 formed on the indivi... | 03/27/2007 |
| 7194906 | Acceleration sensor having resonators with reduced height A compact, highly sensitive acceleration sensor that is not affected by factors other than acceleration, such as a change in temperature, includes a bimorph acceleration-sensor element including first and second resonators and attached to opposite sides of a base pl... | 03/27/2007 |
| 7168321 | Vibration-type piezoelectric acceleration sensor element and vibration-type piezoelectric acceleration sensor therewith The vibration-type piezoelectric acceleration sensor element includes a frame; and a diaphragm, support, and retentive part, provided in the frame. The diaphragm includes a bottom electrode layer, a piezoelectric thin-film layer formed on the bottom electrode layer,... | 01/30/2007 |
