With Significant Electrode Or Terminal Feature Patents (Class 361/278)
  • Patent number: 6396677
    Abstract: A new type of high-Q variable capacitor includes a substrate, a first electrically conductive layer fixed to the substrate, a dielectric layer fixed to a portion of the electrically conductive layer, and a second electrically conductive layer having an anchor portion and a free portion. The anchor portion is fixed to the dielectric layer and the free portion is initially fixed to the dielectric layer, but is released from the dielectric layer to become separated from the dielectric layer, and wherein an inherent stress profile in the second electrically conductive layer biases the free portion away from the dielectric layer. When a bias voltage is applied between the first electrically conductive layer and the second electrically conductive layer, electrostatic forces in the free portion bend the free portion towards the first electrically conductive layer, thereby increasing the capacitance of the capacitor.
    Type: Grant
    Filed: May 17, 2000
    Date of Patent: May 28, 2002
    Assignee: Xerox Corporation
    Inventors: Christopher L. Chua, Eric Peeters, Koenraad F. Van Schuylenbergh, Donald L. Smith
  • Patent number: 6377438
    Abstract: A microelectromechanical system (MEMS) tunable capacitor having low loss and a corresponding high Q is provided. The tunable capacitor includes a first substrate having a first capacitor plate disposed thereon. A fixed pivot structure is disposed on the first surface of the first substrate, proximate the first capacitor plate. The fixed pivot structure as a point of attachment for a flexible membrane that extends outward from the fixed pivot and generally overlies the first capacitor plate. A second substrate is attached to the underside of the flexible membrane and a second capacitor plate is disposed thereon such that the first and second capacitor plates face one another in a spaced apart relationship. A MEMS actuator is operably in contact with the flexible membrane for the purpose of providing an actuation force to the flexible membrane, thereby varying the capacitance between the first and second capacitor plates.
    Type: Grant
    Filed: October 23, 2000
    Date of Patent: April 23, 2002
    Assignee: MCNC
    Inventors: Philip A. Deane, Joseph Mancusi, Mark W. Roberson
  • Patent number: 6373682
    Abstract: A MEMS (Micro Electro Mechanical System) electrostatically operated high voltage variable controlled capacitor device is provided. This device can store high energy over a wide range while using relatively low electrostatic operating voltages. The MEMS device comprises a microelectronic substrate, a substrate signal electrode, and one or more substrate control electrodes. The MEMS device also includes a moveable composite overlying the substrate, having a composite signal electrode, one or more composite control electrodes, and a biasing element. In cross-section, the moveable composite comprises at least one electrode layer and, in most instances, a biasing layer. In length, the moveable composite comprises a fixed portion attached to the underlying substrate and a distal portion moveable with respect to the substrate electrode. The distal and/or medial portions of the moveable composite are biased in position when no electrostatic force is applied.
    Type: Grant
    Filed: December 15, 1999
    Date of Patent: April 16, 2002
    Assignee: MCNC
    Inventor: Scott Halden Goodwin-Johansson
  • Patent number: 6370008
    Abstract: The invention relates to a metallization for a film capacitor, wherein a dielectric capacitor film provided with a metallic coating is wound into a capacitor element in the running direction of the capacitor film, whereby the coating is provided with a segmentation.
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: April 9, 2002
    Assignee: EPCOS AG
    Inventor: Harald Vetter
  • Patent number: 6353527
    Abstract: A variable capacitor includes a driver member including one metal sheet, a head having a driver groove provided therein, engagement portions engaged with a rotor, and a spring function portion in pressure-contact with the rotor are integral with each other. The spring function portion includes a first plate portion extending from one end of the head, which is bent in the first bending portion, and elongated, passing a center shaft, and a second plate portion extending from the end of the first plate portion, which is bent in the second bending portion, and elongated, passing the center shaft. The second plate portion functions as a pressure-contact portion for the rotor.
    Type: Grant
    Filed: January 11, 2001
    Date of Patent: March 5, 2002
    Assignee: Murata Manufacturing Co., LTD
    Inventors: Motohiro Kinoshita, Takeshi Doi, Yukinori Ueda
  • Publication number: 20020018334
    Abstract: MEMS devices include a substrate, an anchor attached to the substrate, and a multilayer member attached to the anchor and spaced apart from the substrate. The multilayer member can have a first portion that is remote from the anchor and that curls away from the substrate and a second portion that is adjacent the anchor that contacts the substrate. Related methods are also disclosed.
    Type: Application
    Filed: March 30, 2001
    Publication date: February 14, 2002
    Inventors: Edward A. Hill, Ramaswamy Mahadevan
  • Patent number: 6268995
    Abstract: A vacuum variable capacitor includes a vacuum bellows for allowing a pressure differential between two volumes inside the capacitor, wherein one of the volumes may be a vacuum volume. The vacuum variable capacitor further includes a conductive bellows disposed within the vacuum volume. In such an arrangement, the materials selected for the vacuum bellows and the conductive bellows may be selected to optimize the function of each bellows.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: July 31, 2001
    Assignee: Jennings Technology
    Inventors: Douglas M. Beuerman, Mark H. Burleson
  • Patent number: 6236281
    Abstract: A Q-controlled microresonator and devices including such resonators.
    Type: Grant
    Filed: September 21, 1999
    Date of Patent: May 22, 2001
    Assignee: The Regents of the University of California
    Inventors: Clark Tu-Cuong Nguyen, Roger T. Howe
  • Patent number: 6229684
    Abstract: A variable capacitor having low loss and a correspondingly high Q is provided. In addition to a substrate, the variable capacitor includes at least one substrate electrode and a substrate capacitor plate that are disposed upon the substrate and formed of a low electrical resistance material, such as HTS material or a thick metal layer. The variable capacitor also includes a bimorph member extending outwardly from the substrate and over the at least one substrate electrode. The bimorph member includes first and second layers formed of materials having different coefficients of thermal expansion. The first and second layers of the bimorph member define at least one bimorph electrode and a bimorph capacitor plate such that the establishment of a voltage differential between the substrate electrode and the bimorph electrode moves the bimorph member relative to the substrate electrode, thereby altering the interelectrode spacing as well as the distance between the capacitor plates.
    Type: Grant
    Filed: December 15, 1999
    Date of Patent: May 8, 2001
    Assignee: JDS Uniphase Inc.
    Inventors: Allen Bruce Cowen, Vijayakumar Rudrappa Dhuler, Edward Arthur Hill, David Alan Koester, Ramaswamy Mahadevan
  • Patent number: 6212056
    Abstract: First and second wafers are micromachined by standard integrated-circuit fabrication techniques to respectively make first and second component parts of a variable capacitor. A thin flexible membrane in the first wafer is integral with and mechanically supported by the first wafer. A metal pattern on the first wafer includes a first capacitor plate on the membrane. In the second wafer, a well is formed. A metal pattern on the second wafer includes a second capacitor plate in the well. By bonding the two parts together face-to-face, the capacitor plates are positioned in spaced-apart alignment with each other. External electrical connections to the plates are made via bonding-pad portions of the metal patterns on the wafers. In response to electrical control signals, the metal plate on the membrane can be moved toward the other plate, thereby selectively changing the capacitance of the assembly.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: April 3, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Peter Ledel Gammel, James Albert Walker
  • Patent number: 6170138
    Abstract: A capacitor is described, in particular a vacuum capacitor, comprising two electrodes (1, 1′), at least one insulator (5), and means for fastening (4, 4′). A process is proposed according to which the two electrodes (1, 1′) are each produced as one piece of an electrode material through a cold-flow extrusion process. The electrodes so produced are distinguished by a high surface quality. The result of this, in the capacitors produced from such electrodes, is high quality-factors, low temperature coefficients, a high current-carrying capacity, and an excellent dielectric strength, as well as a compact structure with a simultaneous reduction in the number of components required. Capacitors of this type, in particular vacuum capacitors, find application in HF technology for fixed and variable capacitance values.
    Type: Grant
    Filed: March 6, 1998
    Date of Patent: January 9, 2001
    Assignee: Comet Technik AG
    Inventors: J. Andrea Von Planta, Bernhard Hug
  • Patent number: 6147855
    Abstract: A variable capacitor that provides a full range of capacitance, while reducing the amount of rotation necessary to effect maximum variation in capacitance, and while eliminating any wear-related deterioration in device performance includes at least two coplanar, electrically isolated sets of parallel electroconductive members so configured as to form a fixed set of capacitor plates, each of which may be separately electrically connected to an electrical circuit. A movable group having at least one member including at least one electroconductive area is positioned parallel to, and spaced from, the fixed set of plates. The movable group is adapted for rotation about an axis perpendicular to a surface plane of the first set of plates to vary an amount by which said movable group overlaps the surface of each of said capacitor plates, and thereby provide variable capacitive coupling between the two isolated electroconductive members that comprise the fixed set of capacitor plates.
    Type: Grant
    Filed: June 30, 1997
    Date of Patent: November 14, 2000
    Assignee: Applied Materials, Inc.
    Inventor: William N. Taylor, Jr.
  • Patent number: 6134097
    Abstract: A variable capacitor has a stator, a rotor, and a cover. The stator includes a stator electrode and a stator terminal connected electrically to the stator electrode. The rotor includes a rotor electrode facing the stator electrode with a dielectric disposed therebetween. The cover is shaped so as to accommodate and hold the rotor so that it can be rotated relative to the stator. An adjustment hole is formed in the cover so as to permit insertion of a tool for rotating the rotor. A spring-action portion is formed around the adjustment hole to thereby press the rotor against the stator. The stator terminal is formed so as not to extend onto a stator surface facing an edge portion of the cover, thereby maintaining a relatively long distance between the stator terminal and the edge portion of the cover and that between the stator terminal and the rotor.
    Type: Grant
    Filed: September 8, 1998
    Date of Patent: October 17, 2000
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Yasunobu Shibata
  • Patent number: 6127908
    Abstract: A microelectro-mechanical device which includes a fixed electrode formed on a substrate, the fixed electrode including a transparent, high resistance layer, and a moveable electrode formed with an anisotropic stress in a predetermined direction and disposed adjacent the fixed electrode. The device includes first and second electrically conductive regions which are isolated from one another by the fixed electrode. The moveable electrode moves to cover the fixed electrode and to electrically couple to the second conductive region, thus electrically coupling the first and second conductive regions, in response to a potential being applied across the fixed and moveable electrodes. The fixed electrode is transparent to electromagnetic signals or waves and the moveable electrode impedes or allows transmission of electromagnetic signals or waves.
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: October 3, 2000
    Assignee: Massachusetts Institute of Technology
    Inventors: Carl O. Bozler, Richard G. Drangmeister, Robert J. Parr, Lawrence J. Kushner
  • Patent number: 6088214
    Abstract: An array (100) of voltage variable capacitors (110) is provided in which voltage variable capacitors (110) are fabricated with piezoelectric displacement devices (150). Voltage variable capacitors (110) have first plates (120) which are coupled to displacement devices (150). First plates (120) are dielectrically coupled to second plates (130). Displacement device (150) has a stack of metallic layers (154), voltage variable material blocks (152), and voltage supply terminals (170) and (180). Voltage differences are established across voltage variable material blocks (152) using voltage supply terminals (170) and (180). A voltage difference causes a voltage variable material layer to change thickness, and this causes first plate (120) to move relative to second plate (130). Voltage variable material is selected from a group of piezoelectric ceramics, which can include lead-titanate (PbTiO.sub.3), lead-zirconate (PbZrO.sub.3), barium-titanate (BaTiO.sub.3), and lead-zirconate-titanate (PbZr.sub.x Ti.sub.1-x O.
    Type: Grant
    Filed: June 1, 1998
    Date of Patent: July 11, 2000
    Assignee: Motorola, Inc.
    Inventors: Hugh Robert Malone, James R. Phillips, Donald W. Forst, Deborah Sue Dendy, Dean Lawrence Cook
  • Patent number: 6023406
    Abstract: An inductance/capacitance (LC) composite module with a built-in variable capacitor and coil is disclosed which includes a dielectric substrate having one principal surface on which a stator-side electrode is formed. Also formed thereon are a first terminal electrode connected to the stator-side electrode and a second terminal electrode independent of the first terminal electrode. The variable capacitor has a rotor of a chosen solid-state dielectric material in contact with the stator-side electrode. This rotor has thereon a rotor-side electrode which opposes the stator-side electrode with at least part of the rotor laid therebetween, thus forming an electrostatic capacitance. A rotatable support member is mounted so that it may rotate about the axis line at right angles to the substrate surface. The support member transmits its rotation to the rotor allowing the rotor to rotate with the support member.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: February 8, 2000
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Motohiro Kinoshita, Hiroyuki Kishishita
  • Patent number: 5955932
    Abstract: A Q-controlled microresonator and devices including such resonators.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: September 21, 1999
    Assignee: The Regents of the University of California
    Inventors: Clark Tu-Cuong Nguyen, Roger T. Howe
  • Patent number: 5910755
    Abstract: A laminate capacitor circuit board which permits constants of various kinds of circuit elements to be set by selectively effected connections between wiring layers, and a laminate capacitor circuit board which permits distributed circuit constants in a high-frequency wiring layer sandwiched between two shielding wiring layers to be set as desired. These circuits are formed with at least a pattern of a conductive foil on each dielectric layer, and include a plurality of wiring layers laminated one upon another, a wiring layer for connections laminated to a surface of the plurality of wiring layers laminated one upon another, a plurality of terminal patterns formed on the wiring layer for connections in a state insulated from each other, a plurality of vias for electrically connecting at least two of the plurality of terminal patterns to corresponding ones of the plurality of wiring layers, and connecting means for selectively connecting the plurality of terminal patterns to each other.
    Type: Grant
    Filed: October 28, 1997
    Date of Patent: June 8, 1999
    Assignee: Fujitsu Limited
    Inventors: Hidehiro Mishiro, Kenichiro Tsubone, Mitsunori Abe, Rie Takada
  • Patent number: 5901031
    Abstract: A reference electrode is fixed on the bottom of a concave portion of a substrate. A movable electrode is provided so that its electrode face faces that of the reference electrode at an interval to form a capacitor by the movable and reference electrodes. A driving electrode for driving the movable electrode is fixed on the substrate at an interval from the movable electrode. The distance 2L between the driving and movable electrodes is twice the distance L between the movable and reference electrodes. An external bias voltage is applied between the driving and movable electrodes to deflect the movable electrode. This doubles the range of the displacement of the movable electrode, thereby increasing the capacity change rate of the variable capacitor.
    Type: Grant
    Filed: January 31, 1996
    Date of Patent: May 4, 1999
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Tsutomu Ishige, Yasuhiro Negoro, Yuji Iyoda, Yasutaka Fujii, Katsuhiko Tanaka
  • Patent number: 5818683
    Abstract: A small variable capacitor including a movable section composed of a movable electrode supported by a supporting section. A driving electrode and a detecting electrode are provided facing the movable electrode. When an external bias voltage is applied between the movable electrode and the driving electrode, Coulomb force is generated between them. Due to that, the movable section is attracted toward the driving electrode while keeping a balance between its own resilience force and the Coulomb force. At this time, part of the movable section facing the detecting element is displaced more than the other part of the movable section facing the driving electrode. Thereby, because an electrostatic capacity between the movable section and the detecting electrode is inversely proportional to the average distance, a large electrostatic capacity may be obtained and variability of the electrostatic capacity becomes large.
    Type: Grant
    Filed: August 19, 1996
    Date of Patent: October 6, 1998
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Yasutaka Fujii
  • Patent number: 5640133
    Abstract: A tunable electromicromechanical resonator structure incorporates an electrostatic actuator which permits reduction or enhancement of the resonant frequency of the structure. The actuator consists of two sets of opposed electrode fingers, each set having a multiplicity of spaced, parallel fingers. One set is mounted on a movable portion of the resonator structure and one set is mounted on an adjacent fixed base on substrate, with the fingers in opposed relationship and their adjacent ends spaced apart by a gap. An adjustable bias voltage across the sets of electrodes adjusts the resonant frequency of the movable structure.
    Type: Grant
    Filed: June 23, 1995
    Date of Patent: June 17, 1997
    Assignee: Cornell Research Foundation, Inc.
    Inventors: Noel C. MacDonald, Fred M. Bertsch, Kevin A. Shaw, Scott G. Adams
  • Patent number: 5636099
    Abstract: A variable capacitor for a high frequency circuit of an electrical appliance includes a chip capacitor mounted on a multilayer circuit board and interdigital capacitors formed at inner layers of the circuit board. A wiring pattern for soldering the chip capacitor is connected with the interdigital capacitors via through holes formed in the circuit board. Capacitance select portions are cut so that the capacitance best-suited to the circuit is obtained. The through holes connected to the interdigital capacitors of the inner layer are selectively disconnected from the wiring pattern for soldering the chip capacitor, thereby obtaining a variable capacitor capable of absorbing fluctuations of the circuit for selecting the best-suited capacitance.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: June 3, 1997
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroshi Sugawara, Fumikazu Harazono
  • Patent number: 5610528
    Abstract: A capacitive bend sensor includes a first element having a comb-patterned portion of conducting material, and a second element having a comb-patterned portion of conducting material. A dielectric material is disposed between the comb-patterned portion of the first element and the comb-patterned portion of the second element. The first element is bonded to the second element such that the comb-patterned portion of the first element slides relative to the comb-patterned portion of the second element when the first and second elements are bent. Bend angle is measured according to the alignment of the comb-patterned portion of the first element and the comb-patterned portion of the second element. The sensor may be coupled to a human finger to measure bend angle of the finger, or may be coupled to a joint of a human body to measure bend angle of the joint.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: March 11, 1997
    Assignee: International Business Machines Corporation
    Inventors: James S. Neely, Phillip J. Restle
  • Patent number: 5604658
    Abstract: In a multilayer metallisation/dielectric structure on a silicon substrate a trimmable capacitor is formed between two of the higher metallisation layers, with one layer being segmented and the individual segments connected by way of one or more vias and respective narrow links to one terminal of the capacitor. The narrow links are formed from titanium tungsten on the oxide isolated silicon substrate.
    Type: Grant
    Filed: July 12, 1995
    Date of Patent: February 18, 1997
    Assignee: Plessey Semiconductors Limited
    Inventor: David J. Pedder
  • Patent number: 5600187
    Abstract: An electrically controllable variable capacitor includes the interelectrode capacitance of at least one power MOSFET, a capacitance connected in series with the MOSFET and having one terminal connected to the drain or source thereof (the series capacitance), and bias control circuitry for controlling the bias voltage applied to the MOSFET. The voltage rating of the MOSFET, the peak amplitude of the applied ac signal, and the value of the series capacitance determine the range of dc bias voltages over which the MOSFET can be operated, and hence the capacitance range of the variable capacitor. Such a variable capacitance is useful as a tuning capacitor in an electrodeless HID lamp ballast.
    Type: Grant
    Filed: June 27, 1994
    Date of Patent: February 4, 1997
    Assignee: General Electric Company
    Inventors: Sayed-Amr El-Hamamsy, Robert S. Scott, Joseph C. Borowiec
  • Patent number: 5530368
    Abstract: A capacitive sensor has a pair of plate-shaped electrodes (4) spaced apart from one another and defining a measurement slot (3) therebetween. Guides (5) mask out edge zones of the measurement slot (3) and reduce its width. These guides (5) are formed as the two legs of an elongated U-shaped guiding part (7) which can be inserted into the measurement slot (3) and can be fixed in the latter.
    Type: Grant
    Filed: September 28, 1993
    Date of Patent: June 25, 1996
    Assignee: Zellweger Luwa AG
    Inventor: Niklaus Hildebrand
  • Patent number: 5525843
    Abstract: A method and system for detecting the presence of an occupant on a vehicle seat is disclosed. The vehicle seat is provided with at least a pair of electrodes which are connected to a detection circuit for detecting a change in capacitance between the electrodes. If the detection circuit detects a sufficiently large change in capacitance, a positive detection signal is produced. To reduce the risk of interference, the electrodes of the detection circuit are substantially insulated from the chassis of the vehicle and its electrical system when the detection circuit is in an active condition.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: June 11, 1996
    Assignee: AB Volvo
    Inventor: Mats Howing
  • Patent number: 5512836
    Abstract: A solid-state fringe effect capacitive proximity sensor is described which lends itself to use for surface mounting and other space constrained applications. The sensor comprises an insulating substrate having a plurality of sensing electrodes formed thereon and without any screen elements therebetween. The electrodes are adapted to measure the proximity distance of a target object (conductive or non-conductive) by means of the fringe capacitance effect created between the electrodes. Capacitance measurement processing circuitry is electrically connected to the plurality of sensory electrodes.
    Type: Grant
    Filed: July 26, 1994
    Date of Patent: April 30, 1996
    Inventors: Zhenhai Chen, Ren C. Luo
  • Patent number: 5491604
    Abstract: Resonator systems with controlled quality factors including a resonator having a plurality of ports and a first quality factor greater than the system quality factor, and an amplifier providing negative feedback among the ports to render the system quality factor independent of the resonator quality factor.
    Type: Grant
    Filed: December 11, 1992
    Date of Patent: February 13, 1996
    Assignee: The Regents of the University of California
    Inventors: Clark T.-C. Nguyen, Roger T. Howe
  • Patent number: 5483414
    Abstract: Electrical impedance detector for measurement of physical quantities, in particular of temperature. The detector comprises electrodes (11,14), between which the electrical impedance (C;R) that represents the physical quantity to be measured is measured. Between these electrodes (11,14) there is an active material whose impedance properties are a function of the physical quantity to be measured. The active material of the detector is a very thin thread-like glass or glass-ceramic fibre (10), which has been manufactured by means of the glass-drawing technique. Further, a process for the manufacture of said detectors is described.
    Type: Grant
    Filed: March 30, 1993
    Date of Patent: January 9, 1996
    Assignee: Vaisala Oy
    Inventor: Heikki Turtiainen
  • Patent number: 5446616
    Abstract: A sensing electrode on a glass layer of an anodically-bonded capacitive sensor has an interfacial barrier film containing a nitride compound between the electrode and the glass layer. In one embodiment, the capacitive sensor is an inertial sensor having a sensing element hingedly mounted to a frame which is anodically bonded to the glass layer. The sensing electrode is then located on a surface of the glass layer facing the sensing element. The sensing element and the frame are preferably made of silicon and the interfacial film is preferably silicon nitride.
    Type: Grant
    Filed: March 28, 1994
    Date of Patent: August 29, 1995
    Assignee: Litton Systems, Inc.
    Inventor: Keith O. Warren
  • Patent number: 5436795
    Abstract: A monolithic capacitive pressure transducer (12, 12') is made by separately forming under pressure a diaphragm (22, 22') and a base (24, 24') having a recess (14) in the top surface using ceramic powder coated with an organic binder. Metal layers are deposited on the two pieces and the pieces are then joined together to form a single unit. A spacer (36) may be inserted in the recess to ensure that a predetermined gap is maintained between the two parts during the joining operation. The parts are then heated to allow the binder organics, as well as the spacer organics if a spacer is employed, to be vaporized and/or decomposed and removed through the open pores of the diaphragm and base and then sintered to change the parts into a monolithic body and to convert the metallized layer into a conductive layer bonded to the ceramic.
    Type: Grant
    Filed: March 28, 1994
    Date of Patent: July 25, 1995
    Assignee: Texas Instruments Incorporated
    Inventors: Robert P. Bishop, Paul L. Hainey
  • Patent number: 5424906
    Abstract: In order to obtain a stator of a variable capacitor, prepared is a ceramic laminate having a stator electrode provided in its interior and a plurality of burnaway films of carbon or resin, which can be burned away by firing, provided in positions corresponding to that of a concave portion in the form of layers. This ceramic laminate is fired to burn out the burnaway films thereby obtaining a sintered body provided with a plurality of cavities and a plurality of thin layers, and this sintered body is barrel-polished to crush the thin layers, thereby forming a concave portion. A rotor of a metal forming a rotor electrode is arranged on the stator obtained in the aforementioned manner. A cover of a metal is fixed to the stator through an engaging member engaging in the concave portion of the stator, to rotatably store the rotor while pressing the rotor against the stator by a spring action part.
    Type: Grant
    Filed: April 14, 1993
    Date of Patent: June 13, 1995
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Hiroyuki Kishishita, Yukio Hatanaka, Yukinori Ueda
  • Patent number: 5376890
    Abstract: Apparatus for measuring the distance between a surface of a workpiece and a predetermined location of the type which measures the capacitance between the predetermined location and the workpiece surface and determines the distance corresponding to the measured capacitance. The apparatus includes a probe disposed at said predetermined location, the probe may be selectively excited to a known electric potential. A support assembly for supporting the workpiece is mounted on the apparatus for rotation relative to the probe. The support assembly is constructed to support the workpiece for rotation and to maintain the workpiece at a substantially constant electric potential. A grounding mechanism for grounding the support assembly includes a fixed grounding member and a liquid ground contact which engages the support assembly for maintaining electrical contact between the support assembly and the fixed grounding member as the support assembly rotates relative to the fixed grounding member.
    Type: Grant
    Filed: June 10, 1993
    Date of Patent: December 27, 1994
    Assignee: MEMC Electronic Materials, Inc.
    Inventors: Michael D. Keevil, Brian E. Burgdorf, Paul D. Ketterer, Edwin T. Wood, Jr.
  • Patent number: 5325442
    Abstract: A Fingerprint sensing device and a recognition system having a row/column array of sense elements which are coupled to a drive circuit and a sense circuit by sets of row and column conductors, respectively. The sense elements are actively addressable by the drive circuit. Each sense element contains a sense electrode and a switching device (e.g., a TFT) for active addressing of that sense electrode. The sense electrodes of the sense elements are covered by insulating material adapted for receiving, directly thereon or on respective conductive pads overlying the sense electrodes, a finger. Capacitances resulting from individual finger surface portions in combination with sense electrodes are sensed by the sense circuit by applying a potential to the sense electrodes and measuring charging characteristics. In the fingerprint recognition system, an output from the sensing circuit is analyzed and characteristical data is compared with stored characteristical data for identification and verification purposes.
    Type: Grant
    Filed: February 19, 1993
    Date of Patent: June 28, 1994
    Assignee: U.S. Philips Corporation
    Inventor: Alan G. Knapp
  • Patent number: 5229911
    Abstract: A variable electronic component in the nature of a trimmer capacitor has greatly increased voltage rating and capacitance range, while eliminating possible failure modes. An annular opening formed in a stationary electrode is surrounded by plastic dielectric material so as to receive in interference fit a circular sleeve of an opposing impedance varying electrode. By filling the air gap with plastic dielectric material, no air contributes to the effective dielectric, while at the same time, preventing shorting as a result of loose metallic particles which might be present.
    Type: Grant
    Filed: June 4, 1992
    Date of Patent: July 20, 1993
    Assignee: Voltronics Corporation
    Inventor: David Ditlya
  • Patent number: 5101669
    Abstract: A multibeam structure measures displacement of one or more response elements to detect multiple components of applied force. The flexible beams are each coupled to a response element which may be displaced by a force arising from linear acceleration, angular acceleration, fluid flow, electric/magnetic/gravitational fields, and other sources. The displacement of the response element is detected with a variety of sensing methods including capacitive and piezoresistive sensing.
    Type: Grant
    Filed: May 11, 1990
    Date of Patent: April 7, 1992
    Assignee: University of Hawaii
    Inventors: James W. Holm-Kennedy, Gordon P. Lee
  • Patent number: 5092174
    Abstract: A capacitive acceleration sensor using a common PWB as one of the plates of the capacitive transducer and the wiring connections thereto. An acceleration input moves a capacitor plate to produce a measurable change in capacitance. An electronic signal conditioner accurately converts the capacitance output to a voltage signal to provide an acceleration sensor featuring accurate DC performance. The transducer and electronics are disposed on a PWB making up a complete sensor package. In a first embodiment, the capacitor comprises a fixed electrode on the PWB and a movable acceleration responsive electrode secured to a support by a conductive resilient member, the support coupled to an electrically conductive region on the PWB spaced from the fixed electrode by a guard ring to minimize stray charge between the capacitor electrodes.
    Type: Grant
    Filed: October 19, 1989
    Date of Patent: March 3, 1992
    Assignee: Texas Instruments Incorporated
    Inventors: Eric P. Reidemeister, Keith W. Kawate
  • Patent number: 4999734
    Abstract: An electrode array for use in an apparatus for remotely monitoring the position of a rotatable member as the rotatable member is rotated by an axle about an axis. The array includes a substrate composed of a three-layer composite having first and second surfaces, a plurality of spaced-apart, excitable electrodes defining a center portion disposed on the first surface, an aperture in the substrate located in the center portion for receiving the axle, a center electrode in the center portion spaced apart from the axle circumscribing the aperture, a guard composed of a first conductive strip disposed in the center portion on the first surface spaced apart from and located between the spaced apart excitable electrodes and the center electrode. Each of the excitable electrodes have a concave free edge that delimits a part of the center portion.
    Type: Grant
    Filed: January 2, 1990
    Date of Patent: March 12, 1991
    Assignee: Siecor Corporation
    Inventor: Edward P. Smith
  • Patent number: 4986136
    Abstract: A measuring system in which flexible mats of individual cells are distributed in rows and columns of a matrix are individually pollable for converting mechanical pressures applied locally on surfaces of the mats, into electrical signals. Each cell constitutes a capacitor with capacitance that varies with the applied mechanical pressure. A source of voltage is connectable to each cell, and each cell has an upper surface and a lower surface. Pressure is applied to the upper surface, and a dielectric is positioned between the upper surface and the lower surface. The upper surface has a plurality of parallel strip-shaped areas with projections, whereas the lower surface has a plurality of parallel electrically conductive strip-shaped areas which extend at right angles to the first strip-shaped areas on one side of the dielectric to form a capacitor cell at each intersection. The intersections deforms resiliently under applied pressure to vary the capacitance under pressure.
    Type: Grant
    Filed: December 6, 1989
    Date of Patent: January 22, 1991
    Inventors: Wolfgang Brunner, Ludwig von Zech
  • Patent number: 4912662
    Abstract: An inclinometer 20 has a sensing unit 40 for providing a varying capacitance signal depending on the orientation of the inclinometer 20. An oscillator circuit unit 82 includes the sensor unit 40 as a capacitive element for providing a signal having a period and a frequency depending on the capacitance of the sensor unit 40. A unit 92 is provided for determining the period of the signal. A look-up table unit 96 stores a predetermined relationship between the period of the signal and the angle of orientation of the inclinometer 20. A comparison unit 94 then compares the period of the signal to the period stored in the look-up table unit 96 and selects the corresponding angle which is the angle of orientation of the inclinometer 20. The angle is then displayed on the inclinometer display 25.
    Type: Grant
    Filed: June 22, 1987
    Date of Patent: March 27, 1990
    Assignee: Wedge Innovations, Inc.
    Inventors: Andrew G. Butler, Donald G. Green, Robert E. Nagle
  • Patent number: 4908921
    Abstract: A method of batch producing capacitive pressure sensors in which a sheet of semiconductive material is provided with an insulating layer 4 on one side thereof and a plurality of cavities 1 are formed in the semiconductive sheet by removing part of the insulating layer and part of the semiconductive sheet. Simultaneously with producing the cavities in the semiconductive sheet, at least one recess is provided, again by removing part of the insulating layer and part of the semiconductive sheet.
    Type: Grant
    Filed: August 3, 1988
    Date of Patent: March 20, 1990
    Assignee: Spectrol Reliance Limited
    Inventors: Frank Chen, Tony W. Rogers, David E. Blackaby
  • Patent number: 4852443
    Abstract: A novel capacitive pressure-sensitive sensing technique and apparatus wherein an elastomeric conductive electrode carrying a two-dimensional array of projections is pressure-deformed against a fixed coextensive cooperative electrode to generate signals, such as tones and sounds in the application to musical instruments, or visual representations, corresponding to the dynamic pressures applied over the two-dimensional surface. A novel drum-like and other musical instruments embodying such novel capacitive sensing techniques and the like are described.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: August 1, 1989
    Assignee: Key Concepts, Inc.
    Inventors: Donald A. Duncan, Jeffrey B. Tripp
  • Patent number: 4697159
    Abstract: A tuning capacitor arrangement for a microwave circuit including, on a substrate, first and second conductors to be capacitively joined. The tuning capacitor arrangement includes first and second capacitors each having connective tabs terminating on the substrate in the space between the first and second conductors. One or more connective pieces electrically connect one or more tabs to the conductors to determine the total capacitance between the first and second conductors.
    Type: Grant
    Filed: October 31, 1984
    Date of Patent: September 29, 1987
    Assignee: RCA Corporation
    Inventors: Franco N. Sechi, David Kalokitis
  • Patent number: 4665788
    Abstract: A keyboard-operated tone-producing apparatus having, in combination, keyboard means the keys of which are mounted for downward depression to effect tone production in the apparatus; electronic digital signal processor means; tone-generating means; pressure sensing means responsive to key depression to produce signals corresponding thereto for application to the signal processor means to produce corresponding digital signals applied to generate tones from the tone-generating means; means for causing the pressure sensing means to provide the same signal reference, upon key depression, irrespective of the point of pressure along the path of longitudinal sliding of the key; and means controlled in response to the last-named means and cooperative with the signal processor means as it controls the tone-generating means to produce one or all of variable range bending of the tone, center compensation for differing player techniques of key depression, and second striking of the key while depressed for second tone gene
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: May 19, 1987
    Inventors: Jeff Tripp, John S. Allan, F. Merrick Murphy
  • Patent number: 4629019
    Abstract: A platform weight scale comprising a capacitative load cell sensing means configured to be insensitive to off center loading of the horizontal platform regardless of load amount or location on the platform. The platform is supported by a plurality of springs selected for equal spring rates. The load cell is electrically connected into a FET (Field Effect Transistor), CMOS (Complementary Metal Oxide Semiconductor) or Bi-Polar semiconductor multivibrator circuit selected and designed to sense electric currents on the order of 10.sup.-13 amperes. In one preferred embodiment the load cell comprises a grounded hemispherical surface opposing a flat charged plate. In alternate embodiments the load cell comprises a differential capacitor or a parallel plate capacitor suspended in a manner that is insensitive to off center loading. An additional embodiment for the load cell comprises a spherically concave surface opposing the above grounded hemispherical surface.
    Type: Grant
    Filed: October 4, 1985
    Date of Patent: December 16, 1986
    Assignee: Measuretek, Inc.
    Inventors: Richard H. Harrington, Charles W. Krapf
  • Patent number: 4622528
    Abstract: The microwave filter comprises resonators constituted by capacitor-coupled rejector circuits. The tuning and coupling capacitors are composed of parallel metal plates supported and separated by the dielectric of a substrate. The surface of at least one plate of each tuning and/or coupling capacitor is provided with windows which can be sealed-off by a metal deposit in order to permit adjustment of each capacitor to its optimum value.
    Type: Grant
    Filed: September 11, 1984
    Date of Patent: November 11, 1986
    Assignee: Alcatel Thomson Espace
    Inventor: Roland Milard
  • Patent number: 4605985
    Abstract: A sensor array includes a number of discrete elements each comprising a dielectric body and two electrodes. Dielectric body has an annular skirt and the electrodes define an annular gap in which an end portion of the skirt is located. Body is displaced relative to the electrodes upon application of pressure thereto, causing the skirt to further penetrate the gap and cause a detectable change in capacitance of the electrodes, related to the magnitude of the applied pressure. The dielectric bodies are supported by a common, resilient sheet which returns the bodies to a rest position when pressure is removed.
    Type: Grant
    Filed: September 6, 1985
    Date of Patent: August 12, 1986
    Assignee: Emi Limited
    Inventor: Jeremy D. M. Watson
  • Patent number: 4585082
    Abstract: A platform weight scale comprising a capacitative load cell sensing means configured to be insensitive to off center loading of the horizontal platform regardless of load amount or location on the platform. The platform is supported by a plurality of springs selected for equal spring rates. The load cell is electrically connected into a FET (Field Effect Transistor), CMOS (Complementary Metal Oxide Semiconductor) or Bi-Polar semiconductor multivibrator circuit selected and designed to sense electric currents on the order of 10.sup.-13 amperes. In one preferred embodiment the load cell comprises a grounded hemispherical surface opposing a flat charged plate. In alternate embodiments the load cell comprises a differential capacitor or a parallel plate capacitor suspended in a manner that is insensitive to off center loading. The differential capacitor load cell embodiment utilizes an alternating switch circuit as a part of the multivibrator circuit.
    Type: Grant
    Filed: August 17, 1984
    Date of Patent: April 29, 1986
    Inventors: Richard H. Harrington, Charles W. Krapf
  • Patent number: 4542444
    Abstract: The present invention provides an improved electrical double layer energy storage cell comprising a pair of electrodes, at least one of which is a carbon paste electrode, a porous ionically conductive separator and an ion insulated connector, the improvement wherein said carbon paste electrode comprises carbon exhibiting a pore volume of less than about 0.45 cc/gm and a median pore radius of less than about 150 Angstroms.
    Type: Grant
    Filed: December 27, 1983
    Date of Patent: September 17, 1985
    Assignee: The Standard Oil Company
    Inventor: Richard C. Boland