Patents Examined by Warren S. Edmonds
  • Patent number: 5493220
    Abstract: A sensor system including a magnetooptic sensing element, a light source, at least one polarizer and at least one detector disposed about the sensing element. The sensing element has a first characteristic such that the sensing element provides a response to an applied external stress.
    Type: Grant
    Filed: March 5, 1993
    Date of Patent: February 20, 1996
    Assignee: Northeastern University
    Inventors: Steven A. Oliver, Charles A. DiMarzio, Stephen W. McKnight
  • Patent number: 5493217
    Abstract: The inductive sensor has an electrical coil (14) having winding end portions (114) and current conductors (15) having conductor end portions (115) which are electrically contacted by the winding end portions (114) of the coil in a contact region (18) in the sensor housing (10). A permanently elastic material (26), advantageously silicone, encloses the contact region (18) between the conductor end portions (115) and the winding end portions (114). A temperature-resistant circumferential element (28) bearing on the housing (10) also encloses the contact region (18). This circumferential element (28) can be a polyimide strip or heat-resistant adhesive tape. This inductive sensor allows temperature fluctuation cycles to be increased by up to four times without damaging the coil wire and improves sensor durability.
    Type: Grant
    Filed: July 8, 1994
    Date of Patent: February 20, 1996
    Assignee: Robert Bosch GmbH
    Inventors: Ulrich Stahl, Uwe Katzenwadel
  • Patent number: 5493219
    Abstract: A peak hold circuit 11 holds a peak value of an output signal from a rotating angle sensor 6. A bottom hold circuit 12 holds a bottom value of the output signal from the rotating angle sensor 6. A threshold value is set from the peak value by the peak hold circuit 11 and the bottom value by the bottom hold circuit 12 by resistors 24 to 27, analog switches 28 and 29 and a NOT circuit 31. A comparator 10 compares the output signal of the rotating angle sensor 6 with the set value thus set, and outputs a binary signal (digitized signal) in accordance with the comparison result.
    Type: Grant
    Filed: April 14, 1994
    Date of Patent: February 20, 1996
    Assignee: Nippondenso Co., Ltd.
    Inventors: Yasuki Makino, Seiki Aoyama, Ichirou Izawa, Tomoatsu Makino, Susumu Kuroyanagi
  • Patent number: 5491407
    Abstract: A wheel bearing speed sensor includes an annular rotor mounted to a vehicle axle spindle, having a plurality of teeth extending radially outwardly, which is received within a stationary stator assembly. The stator assembly includes an annular stator having a corresponding plurality of teeth extending from one end and positioned proximate to the rotor teeth. A bobbin member is slidably received within the stator just above the radially aligned rotor and stator teeth and is restricted from movement toward the teeth. A flexible magnetic strip is magnetically adhered to the inner surface of the stator adjacent the bobbin member, wherein the magnetic strip restricts movement of the bobbin member axially away from the radially aligned teeth. A variable reluctance magnetic flux path is established simultaneously between all of the rotor and stator teeth as the spindle rotates, thereby inducing a corresponding variable voltage in the bobbin windings.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: February 13, 1996
    Assignee: Kearney-National, Inc.
    Inventors: William R. Maxson, Jerry D. Heiniger, James C. Rustman
  • Patent number: 5483162
    Abstract: A magnetic detector, such as is used in a frequency generator, for detecting the rotational rate of a motor includes magnetic resistance elements and an operational amplifier. The magnetic resistance elements have a predetermined resistance ratio and are connected serially between a power source and ground. The common node between the two magnetic resistance elements serves as an output terminal for providing an output voltage. The output voltage from the output terminal being supplied to one of the two input terminals of the amplifier. The voltage from a resistance voltage divider disposed between the power source and ground is supplied to the other input terminal of the amplifier. A change of the resistance ratio between the two magnetic resistance elements is effected by a resistor disposed in series with the elements or in parallel with one of the elements.
    Type: Grant
    Filed: October 28, 1992
    Date of Patent: January 9, 1996
    Assignee: Sankyo Saiki Mfg. Co., Ltd.
    Inventors: Isao Ushikoshi, Hayato Naito
  • Patent number: 5479102
    Abstract: A simulated load circuit for measuring the impedance of the arc discharge of an electrodeless discharge lamp of the type having an arc tube and an excitation coil for exciting the arc discharge in an ionizable fill contained therein includes: a secondary coil spaced apart from the excitation coil by a distance which is varied in order to vary the coupling coefficient between the secondary coil and the excitation coil; a fixed load resistance coupled to the secondary coil; and a variable matching network coupled in series or parallel with the load resistance, the impedance of the matching network being varied in order to vary the ratio of reactance to resistance of the load circuit. The distance between the secondary coil and the excitation coil is varied, and the impedance of the matching network is varied, until the input impedance of the load circuit is substantially equivalent to the operating impedance of the lamp.
    Type: Grant
    Filed: April 19, 1994
    Date of Patent: December 26, 1995
    Assignee: General Electric Company
    Inventors: Sayed-Amr A. El-Hamamsy, Michael M. Secen, Mark E. Duffy, Gerald E. Duffy
  • Patent number: 5479098
    Abstract: In a magnetic recording system, a loop-back test circuit provides a technique to test a magnetic recording head, a read circuit, and a write circuit to a read-write head, is sensed through the voltage generated at the head by the test current, such that a small voltage portion of the test signal is transferred through a resistor toga read circuit. The voltage portion is then filtered through a capacitor to form detectable peaks such that the read signal is generated with pulses corresponding to the peaks.
    Type: Grant
    Filed: March 15, 1993
    Date of Patent: December 26, 1995
    Assignee: Trace Mountain Products, Inc.
    Inventors: Ray Y. Yokoyama, Gerald L. Pressman
  • Patent number: 5478966
    Abstract: The detector is a foldable one constructed of unit elements 1a-1n connected with each other through hinge members 6. The members 6 are staggered in arrangement along the longitudinal direction of the unfolded or stretched detector so as to permit the detector to be folded in staggered manner. In storage and transport, the detector is folded to facilitate its handling. In installation, the detector is unfolded or stretched to assume a long-reach form to facilitate its installation in a liquid-level gauge system of a storage tank 13.
    Type: Grant
    Filed: November 9, 1994
    Date of Patent: December 26, 1995
    Assignee: Tokyo Keiso Kabushiki-Kaisha
    Inventor: Tokio Sugi
  • Patent number: 5475302
    Abstract: A pick-up for the inductive production of a measurement signal reproducing the relative position of first and second bodies which are movable relative to each other includes at least one exciter coil operable with alternating current for the production of a magnetic flux, a measurement coil arrangement at which voltages from which the measurement signal is derived can be taken off, and a flux guide means of ferromagnetic material for carrying the magnetic flux produced by the exciter coil on a closed measurement path in such a way that at least a part of the magnetic flux passes through the measurement coil arrangement, and at least one of the voltages which can be taken off at the measurement coil arrangement changes in dependence on the movement of one of the bodies relative to the other.
    Type: Grant
    Filed: August 14, 1992
    Date of Patent: December 12, 1995
    Assignee: Walter Mehnert
    Inventors: Walter Mehnert, Thomas Theil
  • Patent number: 5475306
    Abstract: A shielding sleeve (19) for SQUID-magnetometers which serves to shield from electromagnetic interference fields, consists of an electrically conductive shielding material so as to obtain adequate RF shielding in conjunction with a low noise contribution, completely envelops a non-shielding cryostat (10), has a predetermined sheet resistance and consists of at least one layer of the shielding material in order to avoid an increase of the magnetometer overall noise.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: December 12, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Kai-Michael Ludeke, Olaf Dossel, Jurgen Kohler
  • Patent number: 5469054
    Abstract: A position sensor is provided with two target tracks which each comprise a plurality of magnetic and nonmagnetic segments. Each target track is associated with a magnetically sensitive device such as a Hall effect element. By appropriately positioning the locations of the pluralities of magnetic and nonmagnetic segments, output signals from the magnetically sensitive devices can be caused to generate preselected signal patterns. These signal patterns can be combined to synthesize a third output signal having a signal pattern of a desired characteristic which would otherwise be unobtainable through the use of a single target path configured with magnetic and nonmagnetic segments to directly generate the desired signal pattern.
    Type: Grant
    Filed: April 22, 1993
    Date of Patent: November 21, 1995
    Assignee: Honeywell Inc.
    Inventor: Robert E. Bicking
  • Patent number: 5467018
    Abstract: A method of geophysical analysis includes transmitting an electromagnetic signal into the earth and measuring the resulting transmission of that signal through the earth to a plurality of spaced recording units. The values of the transmitted signal are locally digitized and stored at each recording unit. The stored data from each recording unit is subsequently transmitted through a telemetric link to a central processing or analyzing unit, the stored data being transmitted from one recording unit at a time and in a preselected sequence. The data may be transmitted from each recording unit in a block and stored in the central processing unit. The digitizing and storing of the measured values at each unit is accomplished through a yield point amplifier. Automatic drift correction processing may also be applied to the measured values obtained from each recording unit.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: November 14, 1995
    Assignee: Bergwerksverband GmbH
    Inventors: Horst Ruter, Kurt-Martin Strack
  • Patent number: 5465045
    Abstract: An eddy current probe of a type used in testing for defects in material surrounding a bolt hole. The probe includes an eddy current coil mounted on one of a plurality of flexible sidewalls that insert into a bolt hole. The probe further includes a knob that rotates to move the flexible sidewalls radially relative to the longitudinal axis of the bolt hole.
    Type: Grant
    Filed: October 28, 1993
    Date of Patent: November 7, 1995
    Inventor: Richard DeRock
  • Patent number: 5465049
    Abstract: A magnetism sensor is disclosed that includes a substrate, a SQUID including a washer of an oxide superconductor thin film formed on a principal surface of the substrate, a hole shaped a similar figure to the washer at the center of the washer, a slit formed between one side of the washer and the hole and a Josephson junction by which portions of the washer at the both sides of the slit are connected across the slit. The magnetism sensor further includes a superconducting flux transformer of an oxide superconductor thin film including an input coil arranged on the SQUID but isolated from the SQUID and a pickup coil arranged on the principal surface of the substrate far from the SQUID, which are connected in parallel and a magnetism shield which excludes flux penetrating into the Josephson junction of the SQUID.
    Type: Grant
    Filed: April 20, 1993
    Date of Patent: November 7, 1995
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takashi Matsuura, Hideo Itozaki
  • Patent number: 5457383
    Abstract: A reduced power consumption fluxmeter is provided which is capable of measuring the effect of continued exposure to an incident magnetic field. An incident magnetic field is measured on a sampled basis by a magnetic detecting element and integrated throughout the entire duration of continued exposure. A measurement time interval between successive measurements is calculated in accordance with the variation in magnitude between successive measurements. In one embodiment, the incident field is measured in three dimensions such that the fluxmeter is not sensitive to the direction of the incident field or the orientation of the fluxmeter. An analog-to-digital converting circuit is provided for converting detected values to digital values and the successive integrations are approximated by multiplying a calculated magnetic flux strength vector by the measuring time period. The integrated values are successively added and stored in a register. The integrated value is displayed by a display element.
    Type: Grant
    Filed: March 30, 1993
    Date of Patent: October 10, 1995
    Assignee: Seiko Instruments Inc.
    Inventor: Tomohiro Takahashi
  • Patent number: 5455508
    Abstract: A rotational angle sensor includes a cylindrical bobbin, a freely-rotatable shaft provided at the center portion of the bobbin so as to extend in a direction vertical to the central axis of the bobbin, two coils which are wound between the center portion of the bobbin and one side portion thereof and between the center portion of the bobbin and the other side portion thereof, respectively, and a magnetic (or non-magnetic) member which is linked to the shaft so as to be freely rotatable in the bobbin such that a rate at which the magnetic member is deviationally located at one side of the two coils is varied in accordance with a rotational angle, whereby the rotation of the shaft is reflected to the variation of the inductance ratio of the two coils. When the non-magnetic member is used, magnetic fluid is filled in the bobbin.
    Type: Grant
    Filed: October 7, 1993
    Date of Patent: October 3, 1995
    Assignee: Zexel Corporation
    Inventor: Hajime Takahashi
  • Patent number: 5453686
    Abstract: A remote object position and orientation determining system employs electromagnetic coupling to sense the position and orientation of a remote object. A plurality of electromagnetic fields are generated having steady state components by applying time-division multiplexed pulsed DC signals to a plurality of field generating elements having spatially independent components defining a source reference coordinate frame. In this manner, the fields are distinguishable from one another. The generated electromagnetic fields are sensed with a remote sensor having a plurality of passive field-sensing elements having spatially independent elements in order to detect the rate-of-change of each of the generated electromagnetic fields. The output of the remote sensors are integrated in order to establish the steady state components of the generated electromagnetic fields. The steady state components are resolved into remote object position and orientation relative to the source reference coordinate frame.
    Type: Grant
    Filed: April 8, 1993
    Date of Patent: September 26, 1995
    Assignee: Polhemus Incorporated
    Inventor: Peter T. Anderson
  • Patent number: 5453695
    Abstract: A relay test assembly including a majority of parts adapted to be injection molded and capable of withstanding large and rapid swings in temperature and humidity. These include a central approximately cylindrical body portion having a plurality of channels of generally-conical shape running therethrough generally-parallel to the axis of the body portion. The channels provide easy entry and straightening to leads of a relay Each channel includes a spring which may be brought to bear against a lead positioned in the channel to provide positive electrical contact to the lead while requiring no force to insert the lead. A sleeve positioned about the body portion is shaped to force the springs into contact with the relay leads.
    Type: Grant
    Filed: March 31, 1993
    Date of Patent: September 26, 1995
    Assignee: Teledyne Industries, Inc.
    Inventors: Arthur J. Sparling, Richard Andes, Nidal Kerdiya
  • Patent number: 5453691
    Abstract: A miniaturized SQUID module (10), notably for multi-channel magnetometers, for measurement of varying magnetic fields in a field strength range below 10.sup.-10 T, includes superconducting and shielded connections between a SQUID chip (19) and a gradiometer (12). The module can be mounted in the lower part of a cryostat and enables a large number of measurement points per unit of surface area. The SQUID chip (19) is arranged on a fully shielded supporting plate (18) which has a width of only a few millimeters and which is provided with electronic circuitry (23), the SQUID chip (19) being connected in a superconducting manner, at least by soldering, to the wires (11) of the gradiometer (12) via a superconducting, solderable and bondable intermediate support (27).
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: September 26, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Bernd R. David, Olaf H. Dossel, Wilfried Edeler, Wolfgang Hoppe, Rolf U. D. Kobs, Johann E. W. Kruger, Kai-Michael Ludeke, Gert Rabe
  • Patent number: 5453690
    Abstract: The feedback current for the flux-locked-loop of a DC-SQUID is conductively supplied directly to the input circuit of the SQUID rather than to a separate feedback or modulation coil that is inductively coupled to the SQUID, thereby eliminating the feedback or modulation coil and simplifying construction of an integrated SQUID module.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: September 26, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Johann E. W. Kruger, Olaf H. Dossel