Magnetic, Inductive Or Capacitive Patents (Class 341/15)
  • Patent number: 7084619
    Abstract: An arrangement for determining the direction of movement of a motion sensor element, requiring only two sensor elements, which, in a first zone having a first pitch and extending in the form of strips along a motion co-ordinate describing a movement of the motion sensor element, comprises periodically recurrent areas alternately influencing a first magnetic field, and, in a second zone having a second pitch and extending in the form of strips along the motion co-ordinate, comprises periodically recurrent areas alternately influencing a second magnetic field, the arrangement comprising a first sensor element for detecting the influence on the first magnetic field by the first zone of the motion sensor element, and a second sensor element for detecting the influence on the second magnetic field by the second zone of the motion sensor element, the first pitch of the first zone being in an odd, integral ratio to the second pitch of the second zone, such as 1:3, 1:5, etc.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: August 1, 2006
    Assignee: Koninklijke Phillips Electronics N.V.
    Inventor: Stefan Butzmann
  • Patent number: 7046176
    Abstract: A rotary type encoder is provided with a signal generating portion 2 for generating a sine wave signal of N periods for each revolution in accordance with the rotation of the shaft 4 of a motor; a calculation means for obtaining the rotation angle of the shaft 4 based on the sine wave signal; an EEPROM 37 being arranged in a manner that the error value of the rotation angle for one revolution of the shaft 4 thus measured is divided in relation with the N periods to set a plurality of first angle regions i, the angle region almost at the center of the angle region i is divided into plural regions to set second angle regions j, and an error value corresponding to the angle at almost the center of each of the angle regions j is stored therein in correspondence with the rotation angle; and a correction means for reading the error value stored in the EEPROM 37 in correspondence with the rotation angle to correct the rotation angle.
    Type: Grant
    Filed: April 11, 2003
    Date of Patent: May 16, 2006
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takashi Okamuro, Hirokazu Sakuma
  • Patent number: 7023363
    Abstract: An encoder system includes an encoding medium having a plurality of encoder target portions alternating with a plurality of encoder window portions. A sensor is movable in relation to the encoding medium. A signal source provides an electronic drive signal to the sensor and sensor electronics coupled to the sensor sense an electrical characteristic of the code strip to determine whether the sensor is next to an encoder target portion or is next to an encoder window portion.
    Type: Grant
    Filed: February 17, 2005
    Date of Patent: April 4, 2006
    Inventors: Saiful Bahari Saidan, Seela Raj Rajaiah
  • Patent number: 6999007
    Abstract: In a linear position encoder, a support is provided upon which a pair of phase quadrature windings are mounted. The windings are arranged to have a sinusoidal magnetic sensitivity characteristic along the length of the support. Mounted on a movable element there is a resonant circuit including a coil and capacitor that can magnetically couple with the windings. When the circuit is excited, it induces currents in the windings that are dependent upon the position of the circuit within a period Ts of the windings. An excitation and processing unit is provided to energize the circuit and to process the signals induced in the windings. The excitation and processing unit is operably coupled to an external high permeability rod extending along the measurement path in a first plane having the windings but removed therefrom. The rod has first and second excitation coils connected in series and wound around the rod and disposed at opposite ends defining a length of the rod.
    Type: Grant
    Filed: May 15, 2003
    Date of Patent: February 14, 2006
    Assignee: Delphi Technologies, Inc.
    Inventors: Yingjie Lin, Warren Baxter Nicholson
  • Patent number: 6987465
    Abstract: A procedure for determining an absolute position of an object, which includes scanning a code pattern from a series of code patterns, wherein each code pattern of said series of code patterns unambiguously defines one absolute position and comprises a plurality of code elements. Forming a code word with a plurality of bits by the scanning the code pattern. Checking the plurality of bits of the code word for reliability, and if one of said plurality of bits fails to attain predetermined criteria, it is assigned an error code. Predetermining a series of bit strings, with one absolute position being unambiguously assigned to each one of the series of bit strings. Comparing the bits of the code word with the predetermined series of bit strings, and if a match of all of the bits of the code word and the predetermined series of bits strings occurs, assigning a corresponding absolute position to the code word, and upon comparison for a match, any bits assigned an error code are not taken into account.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: January 17, 2006
    Assignee: Dr. Johannes Heidenhain GmbH
    Inventor: Rudolf Mittmann
  • Patent number: 6980132
    Abstract: An encoder includes a housing, a light source coupled to the housing, and a light sensor coupled to the housing and positioned to receive a light beam from the light source. The encoder also includes a wheel having opaque and transmissive sections which may be positioned to pass through the light beam before it reaches the light sensor. The encoder further includes a floating aperture piece, which defines at least one aperture. The aperture is positioned so that the light beam must pass through it before reaching the light sensor. The floating aperture piece slidably engages the housing while allowing a loose tolerance between a position of the wheel and a position of the housing, thereby substantially eliminating a positioning error between the aperture and the wheel.
    Type: Grant
    Filed: September 11, 2003
    Date of Patent: December 27, 2005
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Steven E. Soar, Michael A. Viselli
  • Patent number: 6941207
    Abstract: Operates steering angular velocity in first steering angular velocity calculating unit and second steering angular velocity calculating unit, by using steering angle signal from steering angle generating unit, and outputs steering angular velocity by switching them with reference to a certain threshold value of steering angular velocity.
    Type: Grant
    Filed: October 6, 2004
    Date of Patent: September 6, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Katsunori Matsubara, Makoto Inoue
  • Patent number: 6922158
    Abstract: The invention is based on a pressure-medium cylinder having a piston which has a piston rod, and having a measuring system for determining the absolute position of the piston rod relative to a reference point. Firstly, the measuring system has a code track of binary code elements which is applied to the piston rod and runs along the piston rod, which code elements are formed by grooves and plateaus which run in the circumferential direction in a magnetically conductive base material, which is coated with a protective layer, of the piston rod, and, secondly, the measuring system has a sensor which is in a fixed position relative to the reference point and has two or more sensor elements, which are arranged along the code track and each scan a limited number of code elements.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: July 26, 2005
    Assignee: Bosch Rexroth AG
    Inventor: Leo Ymker
  • Patent number: 6909426
    Abstract: The purpose of the present invention is to reduce power consumption caused by controlling circuit in transmitting/receiving process between tablet system and cord less-battery less pointer apparatus. The present invention provides multi-channel switches set produced in semi-conductor process to replace traditional analog switch and tri-state element used in prior art as signal transmitting/receiving selector of inductive loops of tablet, which can simplify controlling circuit, enhance power efficiency of signal transmitting/receiving between tablet system and cord less and cell less pointer apparatus, and increase speed of response of signal transmitting/receiving between tablet and cord less-battery less pointer apparatus.
    Type: Grant
    Filed: March 3, 2003
    Date of Patent: June 21, 2005
    Inventors: Ching-Chuan Chao, Chung-Wen Hsu
  • Patent number: 6847309
    Abstract: The disclosure concerns an encoder for a position sensor, the encoder having a multipole magnetic ring provided on its circumference with alternating north poles and south poles for traveling past a measurement cell that delivers a periodic signal corresponding to variation in the intensity of the magnetic field delivered by the poles.
    Type: Grant
    Filed: July 18, 2002
    Date of Patent: January 25, 2005
    Assignee: Electricfil Industrie
    Inventor: Olivier Andrieu
  • Patent number: 6836223
    Abstract: An ultra-wideband pulse modulation apparatus, system and method is provided. The pulse modulation method increases the available bandwidth in an ultra-wideband, or impulse radio communications system. A set of different pulse transmission, or emission rates are employed to represent different groups of binary digits. The modulation and pulse transmission method enables the simultaneous coexistence of the ultra-wideband pulses with conventional carrier-wave signals. This method may be used in wireless and wired communication networks such as CATV networks. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to guickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.
    Type: Grant
    Filed: December 29, 2003
    Date of Patent: December 28, 2004
    Assignee: Pulse-LINK, Inc.
    Inventor: Steven A. Moore
  • Publication number: 20040246148
    Abstract: There is provided a multirotation type encoder which is small-sized, having nomechanical contact portion other than a bearing, having high reliability and long life and dispensing with interchange of a battery.
    Type: Application
    Filed: April 16, 2004
    Publication date: December 9, 2004
    Inventors: Takefumi Kabashima, Kazunari Matsuzaki, Koji Uemura, Takashi Nagase
  • Patent number: 6828783
    Abstract: An angle measuring instrument having a device for determining a shaft angular position within one shaft rotation, and a device for determining a number of executed shaft rotations having a gear including at least one gear for converting the shaft rotary motion into rotary motion having a defined reduction ratio. The gear unit includes at least one gear wheel which rotates in a defined ratio to the shaft rotary motion. Devices are provided for generating sensor signals which are positionally dependent and are dependent upon the shaft rotations, in which the detecting device inductively scans reduced rotational movements of the shaft, and has alternating electrically conductive and electrically non-conductive graduation regions and a scanning device, movable relative to the graduation structure, including a device for generating a homogeneous electromagnetic field and a sensor device to scan the graduation structure and to transmit sensor signals which are dependent upon the shaft rotations.
    Type: Grant
    Filed: November 15, 2002
    Date of Patent: December 7, 2004
    Assignee: Dr. Johannes Heidenhain GmbH
    Inventors: Andreas Schroter, Marc Tiemann, Johann Oberhauser
  • Publication number: 20040239532
    Abstract: A magnetic encoder in which a pulse generator is protected and sensing capabilities and durability are remarkably improved, and a bearing unit into which the magnetic encoder is incorporated. The magnetic encoder is mounted on a bearing unit and comprises a reinforcing ring and a multi-pole magnet for detecting the rotation speed thereof. The multi-polar magnet is attached to the outside surface of the reinforcing ring, and a peelable protective cover formed from magnetic rubber or the like is attached to the surface of the multi-polar magnet and a handle is provided to facilitate operation. In alternative embodiment, the protective cover is composed of a thin film.
    Type: Application
    Filed: December 30, 2003
    Publication date: December 2, 2004
    Inventors: Naoto Teshima, Hironori Yamamoto
  • Publication number: 20040233072
    Abstract: An annular elastic magnetic body 3 as the magnetic member for a rotation detector contains hydrogenated nitrile rubber as base material and not more than 90 weight percent strontium-based ferrite as a magnetism imparting component. Therefore, the annular elastic magnetic body 3 has no cracks in a thermal shock test (with thermal shock between −40° C. and 150° C.) and resists harsh conditions on operating temperature. The magnetic member contains not less than 80 weight percent the strontium-based ferrite and therefore ensures a magnetic flux density required for a rotation detector. Thus, the magnetic member for a rotation detector is resistant to harsh conditions on operating temperature and has a stable magnetic property.
    Type: Application
    Filed: July 20, 2004
    Publication date: November 25, 2004
    Inventors: Naoki Morimura, Fumiaki Kasahara, Tomomitsu Tamura, Eiji Namira
  • Publication number: 20040227648
    Abstract: A magnetic rubber encoder employing a rubber magnet, of a kind which, within a predetermined range of polarization pitches, the maximum magnetization intensity for the selected polarization pitch can be obtained, is provided. The magnetic rubber encoder 1 includes an annular magnetic member 2 made of a rubber material containing a magnet material and having a plurality of opposite magnetic poles N and S alternating with each other in a direction circumferentially thereof. The relationship between the polarization pitch p of each magnetic pole and the thickness w of the magnetic member 2 is expressed by 0.4 p≦w≦1.0 p. The polarization pitch p is chosen to be within the range of, for example, 0.5 to 1.5 mm.
    Type: Application
    Filed: April 30, 2004
    Publication date: November 18, 2004
    Applicant: NTN CORPORATION
    Inventor: Hiroshi Isobe
  • Publication number: 20040222788
    Abstract: Described are a system and method of recording piston rod position information in a magnetic layer on the piston rod. A piston rod moving with respect to a cylinder has a magnetically hard layer formed thereon to provide a recording medium. A magnetic pattern is recorded in the magnetically hard layer. A magnetic field sensor senses the recorded magnetic pattern while the piston rod is moving with respect to the cylinder and generates signals in response to the magnetic pattern that are used to determine an instantaneous position of the piston rod.
    Type: Application
    Filed: May 6, 2004
    Publication date: November 11, 2004
    Applicant: SRI International
    Inventors: Thomas P. Low, C. Bruce Clark, Ronald E. Pelrine, Joseph S. Eckerle, Chris Smith
  • Publication number: 20040217885
    Abstract: Inductive position detector (10) is described which includes scale (20) having a longitudinal axis containing a train of magnetic balls (22), and a transducer (30) moveable relative to the scale (20). The transducer (30) includes means to induce a magnetic field in the scale (20). Magnetic markers (23) are provided at axially spaced locations along the scale (20). As the transducer (30) is moved along the scale (20), the pattern of magnetic markers (23) detected enables the position of the transducer to be determined.
    Type: Application
    Filed: January 8, 2004
    Publication date: November 4, 2004
    Inventors: Frederick Mark Hudman, Geoffrey Glasgow, Nigel Atherton
  • Publication number: 20040174161
    Abstract: A position sensing system, specifically for elevators, comprising at least one sensor which is able to move relative to a transducer for the sensor. According to the invention, a scale is provided as a transducer, to which scale a code (11-15, 19) detectable by the sensor is applied by which the position of the sensor relative to the scale is able to be measured. As a result, it is possible to detect the absolute height of the elevator car, with the result that, depending on the code, a high level of precision may be achieved. In addition, the position sensing system may be employed for automated start-up operation, and the data measured may be utilized both for the control equipment and to meet safety requirements.
    Type: Application
    Filed: February 9, 2004
    Publication date: September 9, 2004
    Inventors: Wolfgang Tausch, Torsten Wedemeyer
  • Publication number: 20040164732
    Abstract: A rotary encoder and a kit thereof. The kit for a rotary encoder includes a plurality of signal generating members for generating mutually different signals, any selected one of the signal generating members being able to be attached in an exchangeable manner to a rotary body; and a signal sensing unit arranged in close proximity to one selected signal generating member attached to the rotary body, for sensing a signal generated due to a rotation of the signal generating member. The signal generating members are respectively formed in such a manner that the numbers of signal-cycles and the signal-intervals in signals generated during a unit rotation of respective signal generating members are different from each other, while the products of the numbers of signal-cycles multiplied by the signal-intervals in the signals are generally identical to each other.
    Type: Application
    Filed: February 20, 2004
    Publication date: August 26, 2004
    Applicant: FANUC LTD.
    Inventors: Mitsuyuki Taniguchi, Keisuke Imai, Ichirou Nagatomo
  • Publication number: 20040155800
    Abstract: The invention is based on a pressure-medium cylinder having a piston which has a piston rod, and having a measuring system for determining the absolute position of the piston rod relative to a reference point. Firstly, the measuring system has a code track of binary code elements which is applied to the piston rod and runs along the piston rod, which code elements are formed by grooves and plateaus which run in the circumferential direction in a magnetically conductive base material, which is coated with a protective layer, of the piston rod, and, secondly, the measuring system has a sensor which is in a fixed position relative to the reference point and has two or more sensor elements, which are arranged along the code track and each scan a limited number of code elements.
    Type: Application
    Filed: April 5, 2004
    Publication date: August 12, 2004
    Inventor: Leo Ymker
  • Patent number: 6768426
    Abstract: A position detection apparatus including a detection unit for an absolute track including a plural number of ABS heads for absolute track, in which the separation between neighboring heads is broadened. The n ABS heads 10-1 to 10-n are arrayed to satisfy the following equations 1 and 2 when n is an even number and the following equations 1 and 3 when n is an odd number: &lgr;1=m&lgr;, m being an integer not less than 2  (1) &lgr;1≠k(2n/2+1)&lgr;, k being a natural number  (2) &lgr;1≠k(2n+1)&lgr;  (3). By arraying the ABS heads 10-1 to 10-n under these conditions, the separation between neighboring ones of the ABS heads 10-1 to 10-n can be 2&lgr; or larger.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: July 27, 2004
    Assignee: Sony Precision Technology Inc.
    Inventors: Yasuo Nekado, Masaaki Kusumi
  • Publication number: 20040124999
    Abstract: A capacitive motion sensor includes a primary plate including a primary pattern replicated periodically, a secondary plate including a plurality of pattern regions with an insulated region inserted therebetween, wherein each of the pattern regions has a secondary pattern replicated periodically, a signal source for sending a plate input signal to the primary plate, and a displacement measuring unit for receiving a plurality of plate output signals from the secondary plate to measure a displacement of a moving one of the plates with respect to the other one of the plates.
    Type: Application
    Filed: December 18, 2003
    Publication date: July 1, 2004
    Applicant: POSTECH FOUNDATION
    Inventors: Moojin Kim, Wonkyu Moon, Wankyun Chung
  • Patent number: 6750784
    Abstract: A rotary position transducer with a cosine and sine attenuating voltage wave output has the substantially linear portions segmented and pieced together from a predetermined set of conditions to form a continuously linearly varying voltage output.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: June 15, 2004
    Assignee: Eaton Corporation
    Inventor: Peter M. Jacobsen
  • Patent number: 6744385
    Abstract: A magnetic micro-encoder 1 has a magnetic disk 4 polarized in an axial direction, a first back yoke 5 mounted on the magnetic disk 4, two magnetic sensors 6 arranged opposite to a surface of the magnetic disk 4 in an axial direction with a gap therebetween and being mounting on sensor mounting part of a flexible printed substrate 7 in such a manner that longitudinal direction of these magnetic sensors are substantially parallel to a band-formed wiring part of the flexible printed substrate 7, a second back yoke 8 mounted on a back of the magnetic sensors 6 with the flexible printed substrate 7 intervened therebetween and forming a magnetic circuit with the e first back yoke 5 and the magnetic disk 4, and a housing 3 for accmmodating the first back yoke 5, the magnetic disk 4, the magnetic sensors 6, and the second back yoke 8.
    Type: Grant
    Filed: April 7, 2003
    Date of Patent: June 1, 2004
    Assignee: Namiki Seimitsu Houseki Kabushiki Kaisha
    Inventors: Nakamura Kazuya, Sakurai Shinichi, Onodera Fumito, Odagiri Kinya, Shimizu Yukiharu
  • Publication number: 20040066187
    Abstract: A scale that includes a first base body having a first non-magnetizable support and a first set of magnetic elements that are arranged laterally next to the first non-magnetizable support, are magnetized in a single identical direction and are arranged in a measuring direction. A second base body having a second non-magnetizable support and a second set of magnetic elements that are arranged laterally next to the second non-magnetizable support, are magnetized in the single identical direction and area arranged in the measuring direction. The first base body and the second base body are put together such that in the measuring direction alternating ones of the first and second sets of magnetic elements are arranged and the first and second sets of magnetic elements have different magnetic orientations with respect to each other.
    Type: Application
    Filed: July 17, 2003
    Publication date: April 8, 2004
    Inventors: Andreas Schroter, Michael Schwabe
  • Patent number: 6708126
    Abstract: A current sensing system including a carrier strip, the carrier strip disposed so as to be associated with a current carrying conductor, wherein when an electrical current flows through the conductor, the electrical current flowing through the conductor creates a magnetic field having a magnetic flux, wherein the magnetic flux is responsive to the electrical current flow, a Hall effect sensor disposed relative to the carrier strip such that the Hall effect sensor is communicated with the magnetic field, wherein the Hall effect sensor generates an electrical signal responsive to the magnetic flux and a metering device in communication with the Hall effect sensor, wherein the metering device processes the electrical signal so as to create a processed signal responsive to the electrical current flow.
    Type: Grant
    Filed: May 17, 2002
    Date of Patent: March 16, 2004
    Assignee: General Electric Company
    Inventors: Mark Fredrick Culler, Scott Charles Evans
  • Publication number: 20040036631
    Abstract: A magnetic encoder (6) which is used in a wheel bearing, that forms a pulse train by means of a magnetic force, and generates a code, comprising a magnetic ring (1), a reinforcing ring (2), and a protecting cover (3). The magnetic ring (1) is fixed to said reinforcing ring (2) and circumferentially magnetized with alternate S poles and N poles. The protecting cover (3) is made of a non-magnetic material and wraps around the magnetic ring (1). A plural number of weld-adhering parts are provided between an end part and/or end parts on a radial inner circumferential side and/or a radial outer circumferential side of the protecting cover (3), and the reinforcing ring (2).
    Type: Application
    Filed: August 20, 2003
    Publication date: February 26, 2004
    Inventor: Toshio Kayao
  • Publication number: 20040036469
    Abstract: An encoder (10) for a nanopostioner (24) includes a strip of magnetic bits (18) for producing discrete magnetic fields and a giant magnetoresistor (GMR) (14) which changes in electrical resistance in response to changes in the magnetic fields. The GMR (14) is connected to a mass (12) which moves along a path proximate to the strip of magnetic bits (18). A voltage sensor (20) is connected to the GMR (14) to produce digital signals based on the changes in electrical resistance of the GMR (14). A processor (22) calculates the position of the nanopositioner (24) based on the digital signals.
    Type: Application
    Filed: August 28, 2003
    Publication date: February 26, 2004
    Inventor: David P. Fries
  • Publication number: 20040032345
    Abstract: A magnetic micro-encoder 1 has a magnetic disk 4 polarized in an axial direction, a first back yoke 5 mounted on the magnetic disk 4, two magnetic sensors 6 arranged opposite to a surface of the magnetic disk 4 in an axial direction with a gap therebetween and being mounted on a sensor mounting part of a flexible printed substrate 7 in such a manner that longitudinal directions of these magnetic sensors are substantially parallel to a band-formed wiring part of the flexible printed substrate 7, a second back yoke 8 mounted on a back of the magnetic sensors 6 with the flexible printed substrate 7 intervened therebetween and forming a magnetic circuit with the first back yoke 5 and the magnetic disk 4, and a housing 3 for accommodating the first back yoke 5, the magnetic disk 4, the magnetic sensors 6, and the second back yoke 8.
    Type: Application
    Filed: April 7, 2003
    Publication date: February 19, 2004
    Inventors: Nakamura Kazuya, Sakurai Shinichi, Onodera Fumito, Odagiri Kinya, Shimizu Yukiharu
  • Publication number: 20040017301
    Abstract: A magnetic encoder for use in a wheel bearing that forms a pulse train by means of a magnetic force and generates a code. The magnetic encoder is obtained by radially magnetizing a magnetic rubber ring with alternate S poles and N poles, said magnetic rubber ring is formed by vulcanizing and adhering a magnetic rubber base, in which unvulcanized rubber and rare earth magnetic powder are mixed, to a reinforcement ring.
    Type: Application
    Filed: July 18, 2003
    Publication date: January 29, 2004
    Inventor: Hideo Mizuta
  • Patent number: 6683545
    Abstract: In a multiturn rotary encoder, a first code disk is arranged with an input shaft for detecting the angular position of the input shaft within one rotation. To detect the number of rotations of the input shaft, a multiturn part is provided with further code disks in the form of magnet bodies which are driven geared down. A printed circuit board having detector devices for scanning the first code disk and the magnet bodies is positioned between the first code disk and the multiturn part. The detector devices of the first code disk and of the magnet bodies are mounted on one common side of a printed circuit board which is opposite the first code disk.
    Type: Grant
    Filed: September 30, 2002
    Date of Patent: January 27, 2004
    Assignee: Dr. Johannes Heidenhain GmbH
    Inventor: Erich Strasser
  • Patent number: 6683544
    Abstract: The seat position sensor includes a housing, a magnetoelectric converting element which performs changeover of an output at a given magnetic field intensity, and a magnet which is held by the housing at a position where the magnet faces the magnetoelectric converting element in an opposed manner. A shielding plate is capable of entering into or exiting from a space defined between the magnetoelectric converting element and the magnet. An inverse bias magnet which applies a magnetic field of an inverse direction to the magnet is provided to a side opposite to the magnet side while sandwiching the magnetoelectric converting element therebetween.
    Type: Grant
    Filed: May 14, 2002
    Date of Patent: January 27, 2004
    Assignee: ALPS Electric Co., Ltd
    Inventors: Ichiro Tokunaga, Yoshihiro Sudo
  • Publication number: 20040012386
    Abstract: According to the invention, a magnetoresistive sensor for scanning a magnetic multipole wheel is proposed, which scans many uniformly disposed magnetic pole pairs. The sensor has four magnetoresistive resistors, which are connected electrically as a Wheatstone bridge with two half-bridges and which output a sine-wave and cosine-wave signal, respectively. To suppress the third and/or fifth harmonic of the scanning signal, it is proposed that the spacing between the two half-bridges be selected such that it is not equal to half the wavelength (lambda). For the third harmonic, the spacing d=lambda/3 is preferably selected, so that the half-bridges are offset by a phase angle of 120°. To suppress the fifth semiharmonic, three identical sensors with a suitable spacing are connected together. The measured signals are averaged, so that the result is a field course with the third and fifth harmonics filtered out.
    Type: Application
    Filed: July 14, 2003
    Publication date: January 22, 2004
    Inventors: Gunther Haas, Henrik Siegle
  • Patent number: 6674371
    Abstract: A utility meter reading device includes a set of stator wheels each including a plurality of conductive segments and a set of indexable digit discs driven sequentially by consumption of a provided utility and having each a conductive segment movable upon rotation of a respective disc into capacitive alignment with one of the conductive segments of a stator wheel; a micro-controller supplies a current signal to the meter discs and stators and through a circuit reads the amount of the utility consumed as reflected in the alignment of certain ones of the conductive segments of the discs and stator wheels.
    Type: Grant
    Filed: August 18, 2000
    Date of Patent: January 6, 2004
    Assignee: Hersey Meter Company
    Inventors: Stewart Oliver, Michael Middleton
  • Patent number: 6667696
    Abstract: A sensor system is provided in which a digital absolute value of the particular position of a stationary part (stator) with respect to a part moving relative to it (rotor) is created, which is transferred in serial transmission to an evaluation circuitry, whereby transfer of the serial absolute value is induced each time by an external signal. In order to increase the resolution of the encoder, the change in absolute value is recorded each time in the sensor and finest interpolation is undertaken beginning each time from the time of the change. Finally, the absolute value is amended by the accumulated result of finest interpolation when interrogated by the external signal.
    Type: Grant
    Filed: April 4, 2002
    Date of Patent: December 23, 2003
    Inventor: Anton Rodi
  • Patent number: 6642711
    Abstract: A differential pulse transformer having a drive coil (10a) and differential sense coils (10b) are disposed on a planar surface with a target (10e, 10f) movable over the sense coils to cause an imbalance in magnetic field when a large di/dt pulse is generated in the drive coil. A detection circuit senses the imbalance and provides a digital output accurately identifying the position of the target. Coil and target embodiments include relatively small secondary coils and relatively long targets (10b, 10e/10f; 12b, 12e/12f and 14b) and relatively large secondary coils and short targets (16b, 16c; 18b, 18c; 20b and 22b).
    Type: Grant
    Filed: January 10, 2002
    Date of Patent: November 4, 2003
    Assignee: Texas Instruments Incorporated
    Inventors: Keith W. Kawate, Gerhard A. Foelsche, Lidu Huang, Gerald H. Fleischfresser
  • Publication number: 20030184290
    Abstract: A magnetic sensor apparatus has a ring circuit constructed with an odd number of semiconductor magnetic sensors connected in a ring shape. The drain regions of each magnetic sensor are separated from each other, so that currents flowing into the drain regions vary corresponding to the magnitude of the applied magnetic field. The semiconductor magnetic sensors function as inverters and inverting operations thereof cause time delay variable with the magnetic field strength. Digital data indicating a propagation condition of a pulse signal within the ring circuit correspond to the magnetic field.
    Type: Application
    Filed: March 21, 2003
    Publication date: October 2, 2003
    Inventors: Noboru Endo, Yasuaki Makino
  • Patent number: 6622391
    Abstract: An incremental rotary encoder includes a rotary portion, a first sensor and a second sensor, the first and second sensors being arranged so as to be opposite from each other with respect to the axis of the rotary portion. The second sensor is offset from the first sensor so that the phase of output voltage of the second sensor advances or delays with respect to the phase of output voltage of the first sensor by &pgr;/X, wherein “X” represents a real number of one or more than one.
    Type: Grant
    Filed: April 27, 2000
    Date of Patent: September 23, 2003
    Assignees: Pentax Corporation, Pentax Precision Co., Ltd.
    Inventors: Masami Shirai, Masato Noguchi, Katsuhiko Kenjo
  • Patent number: 6600308
    Abstract: A magnetic encoder includes a magnetic drum having, on the outer peripheral surface thereof, magnetized portions spaced at equal pitches; a magnetic sensor unit opposed to the outer peripheral surface of the magnetic drum; magnetic sensors are provided in the magnetic sensor unit spaced at a distance smaller than one pitch of the magnetized portions; a calculation device for calculating two sets of vectorial signals, from detection-signal output levels of the magnetic sensors generated upon rotation of the magnetic drum or the magnetic sensor unit, using the following equations (1) and (2): Aout=&Sgr;Wm=1Vm×sin &thgr;m  (1); and Bout=&Sgr;Wm=1Vm×cos &thgr;m  (2); wherein W designates the number of the magnetic sensors; Vm designates the detection-signal output levels of the magnetic sensors generated upon rotation of the magnetic drum or the magnetic sensor unit; Aout and Bout designates one and another set of vectorial signals.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: July 29, 2003
    Assignee: PENTAX Corporation
    Inventors: Masami Shirai, Masato Noguchi
  • Publication number: 20030112158
    Abstract: A miniature magnetic device package for use in applications as small as 5 mm as disclosed. Three embodiments of the invention are provided. In one embodiment, a magnetic encoder includes a magnetic flux responsive element, such as a Hall effect device, sandwiched between a pair of pole pieces, forming a subassembly. A resin, such as epoxy or a thermoplastic material is overmolded over the subassembly forming a housing. The magnetic flux responsive element is configured such that its major axis is generally parallel with a major axis of the housing, thus providing a sensor package with a footprint around 5 mm. The flux concentrators may be configured in an L-shape to provide magnetic focusing adjacent a sensing face of the housing to focus flux toward the magnetic encoder and the Hall effect device. In a second embodiment of the invention, a magnetic sensor is provided. In this embodiment, a magnetic flux responsive element is sandwiched between a magnet and a flux concentrator.
    Type: Application
    Filed: November 4, 2002
    Publication date: June 19, 2003
    Inventor: Brian George Babin
  • Patent number: 6566867
    Abstract: In an angle-based binary encoded crankshaft position sensing system, a target wheel is coupled to a crankshaft and a single VR sensor is juxtaposed with the target wheel for sensing the angular position of the wheel and, hence, the angular position of the crankshaft. To permit the use of a single VR sensor in conjunction with an angle-based binary encoded system, the periphery of the target wheel is formed with teeth and slots defining a binary pattern. The slots are wider than the teeth, and the depth of the slots relative to the portion of the periphery defining a nominal radius is greater than the height of the teeth relative to the nominal periphery. With this structure, the signal generated by the sensor in response to a slot advantageously is symmetric to the signal generated by the sensor in response to a tooth.
    Type: Grant
    Filed: June 24, 1999
    Date of Patent: May 20, 2003
    Assignee: Delphi Technologies, Inc.
    Inventors: Thaddeus Schroeder, Bruno Patrice Bernard Lequesne
  • Patent number: 6549146
    Abstract: A timing apparatus comprises a gear, for example a camshaft gear, and a timing ring secured to one side of the gear. The timing ring has a number of equally spaced timing teeth which when used with a sensor provide information about the rotation of the gear. The gear has a generally cylindrical recess on one face of the gear, and the timing ring is secured within the recess. The timing teeth are arranged radially inwardly of the gear teeth, so that the timing teeth are protected from damage. The resulting timing apparatus is economic to manufacture and facilitates compact adaption to a rotating body of an engine.
    Type: Grant
    Filed: April 20, 2001
    Date of Patent: April 15, 2003
    Assignee: Perkins Engines Company Limited
    Inventor: Geoffrey Paul Bailey
  • Patent number: 6542088
    Abstract: A multi-turn rotary encoder that includes a first code carrier connected with an input shaft, a scanning device that scans the first code carrier and generates an absolute position of the input shaft within one revolution, and a digital code word is present at an output of the scanning device and a second code carrier for measuring the number of revolutions of the input shaft. A reduction gear is arranged between and coupled to the first and second code carriers. The second code carrier includes a magnetic body with at least one north and south pole and a substrate with a spatial arrangement of sensor elements integrated therein, which are sensitive to magnetic fields, is associated with the magnetic body.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: April 1, 2003
    Assignee: Dr. Johannes Heidenheim GmbH
    Inventors: Steffen Bielski, Kurt Feichtinger, Alfons Spies, Erich Strasser, Johann Mitterreiter, Hermann Meyer, Andreas Schroter
  • Publication number: 20020190874
    Abstract: The seat position sensor includes a housing, a magnetoelectric converting element which performs changeover of an output at a given magnetic field intensity, and a magnet which is held by the housing at a position where the magnet faces the magnetoelectric converting element in an opposed manner. A shielding plate is capable of entering into or exiting from a space defined between the magnetoelectric converting element and the magnet. An inverse bias magnet which applies a magnetic field of an inverse direction to the magnet is provided to a side opposite to the magnet side while sandwiching the magnetoelectric converting element therebetween.
    Type: Application
    Filed: May 14, 2002
    Publication date: December 19, 2002
    Applicant: ALPS ELECTRIC CO., LTD
    Inventors: Ichiro Tokunaga, Yoshihiro Sudo
  • Patent number: 6492911
    Abstract: A capacitive motion encoder, for sensing the position of a moving object relative to a stationary object, includes at least one stationary element, coupled to the stationary object and a moving element, coupled to the moving object and in proximity to the stationary element. A field transmitter generates an electrostatic field, which is modulated by a change in capacitance between the stationary and moving elements responsive to relative motion of the elements. A conductive shield, is electrically decoupled from both the moving and the stationary objects, and encloses the moving and stationary elements so as to shield the elements from external electrical interference. Processing circuitry is coupled to sense the modulated electrostatic field and to determine responsive thereto a measure of the position of the moving object.
    Type: Grant
    Filed: April 19, 1999
    Date of Patent: December 10, 2002
    Assignee: Netzer Motion Sensors Ltd.
    Inventor: Yishay Netzer
  • Patent number: 6492806
    Abstract: A magnetic incremental encoder includes a plurality of detection devices which are provided on an outer periphery of a rotational member at a predetermined phase difference, wherein each of the detection devices outputs signals which vary periodically in accordance with the rotational angle of the rotational member upon rotation thereof; wherein the plurality of detection devices are provided in sets of two detection devices on the outer periphery of the rotational member, wherein a phase difference between one of the sets of two detection devices and an adjacent another of the sets of two detection devices is determined according to the following formula: 2&pgr;P+&pgr;/j; wherein P designates an arbitrary integer; and j designates one of the number of k orders, wherein k designates the number of orders of harmonic distortions to be corrected. The number of the plurality of detection devices is equal to 2k.
    Type: Grant
    Filed: June 13, 2001
    Date of Patent: December 10, 2002
    Assignee: Pentax Corporation
    Inventor: Masami Shirai
  • Patent number: 6489899
    Abstract: A position detector is provided for detecting the relative movement of first and second members which are mounted for relative movement along a measuring path. One of the members comprises a magnetic field generator for generating a magnetic field and the other member comprises first and second conductors which are inductively coupled to said magnetic field generator. The arrangement of the first and second conductors and the magnetic field generator is such that output signals are generated in a first and second receive circuits whose position varies with the relative movement between the two members. In addition to carrying information relating to the relative position between the two members, the signals induced in the receive circuits also comprise information defining the relative orientation of the two movable members, and by suitable processing of the received signals the relative orientation of the two members can also be determined.
    Type: Grant
    Filed: July 27, 2000
    Date of Patent: December 3, 2002
    Assignee: Synaptics (UK) Limited
    Inventors: David T. E. Ely, Ross P. Jones, James M. C. England, Alexander W. McKinnon, Robert M. Pettigrew, Andrew N. Dames, Andrew R. L. Howe
  • Publication number: 20020105445
    Abstract: A magnetic encoder includes a magnetic drum having, on the outer peripheral surface thereof, magnetized portions spaced at equal pitches; a magnetic sensor unit opposed to the outer peripheral surface of the magnetic drum; magnetic sensors are provided in the magnetic sensor unit spaced at a distance smaller than one pitch of the magnetized portions; a calculation device for calculating two sets of vectorial signals, from detection-signal output levels of the magnetic sensors generated upon rotation of the magnetic drum or the magnetic sensor unit, using the following equations (1) and (2):
    Type: Application
    Filed: January 30, 2002
    Publication date: August 8, 2002
    Applicant: ASAHI KOGAKU KOGYO KABUSHIKI KAISHA
    Inventors: Masami Shirai, Masato Noguchi
  • Patent number: 6356076
    Abstract: A magnetic incremental motion detection system for outputting a plurality of voltage and/or current signals in analog or digital form wherein the voltage and/or current signals are a collective representation of any incremental rotational, linear, or pivotal movement of an object. A target of the system is adjoined to an object to synchronously move with the object. A plurality of indications are adjoined to the target, and uniformly and serially disposed along an area of a surface of the target. The system further comprises one or more magnetic sensors spatially positioned from the area of the surface to define air gap areas therebetween. Each of the magnetic sensors are operable to output at least one analog signal in response to a synchronous movement of the target with the object. The outputted analog signals have the same duty cycle, and are consistently out of phase with each other by the same degree.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: March 12, 2002
    Assignee: Optek Technology, Inc.
    Inventor: Robert Herman Luetzow