Magnetic Field Variation (e.g., Magnetostrictive) Patents (Class 369/146)
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Patent number: 10423248Abstract: In one embodiment, computer-readable non-transitory storage media receive one or more signals based on motion of an object, a device, or both. The received signals are compared to a motion profile which defines unintended motion of the object, the device, or both, and this comparison determines whether any of the signals represent unintended motion of the stylus or device. The received signals are then processed to correct for the unintended motion defined by the motion profile.Type: GrantFiled: July 19, 2012Date of Patent: September 24, 2019Assignee: WACOM CO., LTD.Inventors: Esat Yilmaz, Vemund Kval Bakken, Kishore Sundara-Rajan
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Patent number: 9091664Abstract: There is described a pulsed eddy current sensor for measurement of a lift-off distance over a surface of a metallic substrate (a metallic surface). The pulsed eddy current sensor comprises: a primary excitation coil to which are applied voltage pulses for generating primary magnetic fields, wherein an interaction of the primary magnetic fields with the metallic substrate produces secondary magnetic fields; and secondary pick-up probes, each of the secondary pick-up probes located at a different vertical distance from the metallic surface, the secondary pick-up probes used for measuring the primary and secondary magnetic fields and for producing a differential signal that is representative of the lift-off distance.Type: GrantFiled: June 7, 2012Date of Patent: July 28, 2015Inventors: Thomas Krause, Roderick J. McGregor, Alexandr Tetervak, Ross Underhill
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Patent number: 6562633Abstract: A method of assembling arrays of small particles or molecules using an atomic force microscope to define ferroelectric domains includes depositing a ferroelectric thin film upon a substrate forming workpiece, then using an atomic force microscope having a conductive, tip for generating a pattern on this thin film to define desired nano-circuit patterns. Next, exposure of this thin film to a solution containing chemical species which selectively adsorb or accumulate under the influence of electrophoretic forces in selected regions of this thin film.Type: GrantFiled: February 26, 2001Date of Patent: May 13, 2003Assignee: International Business Machines CorporationInventors: James Misewich, Christopher B. Murray, Alejandro G. Schrott
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Patent number: 5278818Abstract: A circuit arrangement for reversing a magnetic field, in which an oscillator has a coil connected in parallel with a capacitor. First and second diodes are connected oppositely-poled in a series circuit, which is connected in parallel with the coil and capacitor of said oscillator. A first electronic controlled switch is connected in parallel with the first diode for bypassing this diode, whereas a second electronic controlled switch is connected in parallel with the second diode for bypassing thereof. Energy is supplied to the oscillator whenever the capacitor discharges. The junction of the series connected diodes is connected to the junction of the series-connected switches.Type: GrantFiled: June 17, 1991Date of Patent: January 11, 1994Assignee: Deutsche Thomson-Brandt GmbHInventors: Friedhelm Zucker, Christian Buchler
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Patent number: 5191570Abstract: An optical head locating mechanism for locating an optical head adapted to be positioned in an optical device at a desired point. The optical head locating mechanism comprises a first location device for floating the optical head and locating it at a desired position along a focusing direction, and a second in a direction orthogonal to a tracking direction. Thus, it becomes possible to smoothly and quickly move the optical head, and further it becomes possible to accurately locate the optical head.Type: GrantFiled: November 7, 1990Date of Patent: March 2, 1993Assignee: Asahi Kogaku Kogyo Kabushiki KaishaInventor: Tomoyuki Shirai
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Patent number: 5126984Abstract: An external magnetic field generating device for an optical magnetic disk apparatus is arranged radially of the disk and is used to record information on and erase information from the disk by a laser beam. A surface of the external magnetic field generating device which is remote from the optical magnetic recording disk is made substantially parallel to the disk surface so as to facilitate mounting of the device. A surface of the external magnetic field generating device which faces the disk includes an inclined portion and is shape such that the intensity of the external magnetic field increases as the magnetic field approaches an outer end of the device so as to enable appropriate recording and erasing at both inner and outer peripheries of the disk.Type: GrantFiled: October 1, 1990Date of Patent: June 30, 1992Assignee: Nikon CorporationInventor: Toshihiko Kawai
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Patent number: 4675859Abstract: The invention is an intensified field focus moving coil phonocartridge assembly (10) including a rear magnet (32) and a front magnet (34) mounted in an axially juxtaposed manner within a support sleeve (38) so as to define therewith a magnetic field chamber (36). A signal coil subassembly (26) is suspended within the field chamber (36) and affixed to a cantilever (24) having a stylus (22) on its opposite end such that vibrations of the stylus (22) are physically translated to the signal coil subassembly (26). Electrical signals generated by the currents induced in the windings (29 and 30) of the signal coil subassembly (26) by induction caused by vibration within the field chamber (36) are carried to signal output pins (18) for electronic processing. The primary usage for the phonocartridge assembly (10) is in high quality stereo phonographic equipment for playing phonograph records.Type: GrantFiled: March 5, 1985Date of Patent: June 23, 1987Assignee: Sumiko, Inc.Inventors: Bruce J. Croopnick, David W. Fletcher
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Patent number: 4644518Abstract: An electromagnetic pickup cartridge having a pair of output terminals and a yoke with a pair of arms and a pair of generator coils respectively would on the arms where the first of the coils has a start terminal where the coil winding begins and an end terminal where the winding ends and the second of the coils also has a start terminal and an end terminal to thus provide a first pair of start terminals and a pair of end teminals where one of the pairs of terminals are connected to each other and the other of the pairs of terminals are respectively connected to the output terminals. In particular, the start terminals may be connected to each other while the end terminals are respectively connected to the output terminals or vice versa.Type: GrantFiled: August 30, 1984Date of Patent: February 17, 1987Assignee: Namiki Precision Jewel Co., Ltd.Inventor: Hisayoshi Nakatsuka
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Patent number: 4630253Abstract: Disclosed in a high-performance electromagnetic pickup cartridge with little distortion, comprising a stylus attached to the end of a cantilevered arm, a disk type armature magnetized in its axial direction and secured to the arm, and bar type magnetic core elements disposed in the vicinity of the armature so that they are at right angles to the axis of the cantilevered arm and correspond to each channel of a stereophonic record. When the armature is vibrated, an output signal is generated in respective coils wound around the core elements. Because of the above-described construction, the core elements need only have a bar-shaped configuration without the necessity for opposing faces between which a magnet or an iron piece would otherwise have to be inserted.Type: GrantFiled: April 11, 1980Date of Patent: December 16, 1986Assignee: Alps Electric Co., Ltd.Inventor: Tetsuya Iwata
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Patent number: 4597071Abstract: A moving magnetic pickup cartridge including: a vibratory system having; a stylus arm in a cantilever fashion, a stylus being provided at a free end of the stylus arm, and a permanent magnet being provided at a fixed end of the stylus arm, the magnet being magnetized in a direction of an axis of the stylus arm; a magnetoelectric converting system including; a stationary core having first, second and third yoke members magnetically coupled at their one pole ends to each other, the first and second yoke members having their other pole ends face respective lateral peripheral sides of the permanent magnet while the third yoke member has its other pole end facing an upper periphery of the magnet; and a coil system which includes at least two sets of coils, each set of which is wound around the first, second and third yoke members, one set of coils producing a sum of a horizontal signal and a vertical signal corresponding respectively to a horizontal component and a vertical component of the magnet vibration, the oType: GrantFiled: May 25, 1983Date of Patent: June 24, 1986Assignee: Nippon Gakki Seizo Kabushiki KaishaInventors: Tsugio Ito, Shigeru Fujita
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Patent number: 4534022Abstract: A grounding technique for a screening shell of a phonograph cartridge. A connector pin is offset with respect to other pins of the cartridge so as to be in direct contact with one of the walls of the shell.Type: GrantFiled: July 25, 1983Date of Patent: August 6, 1985Inventor: Michael Leipnitz
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Patent number: 4524439Abstract: An electromagnetic pickup cartridge comprises a movably supported permanent magnet magnetized in the direction of the thickness thereof, a cantilever secured to the magnet with a stylus attached to the free end thereof, and a pair of magnetic flux sensors stationarily mounted above the permanent magnet at right angles to each other for sensing the angular displacement of the permanent magnet about different axes with respect to a neutral position.Type: GrantFiled: April 9, 1984Date of Patent: June 18, 1985Assignee: Victor Company of Japan, LimitedInventor: Katsuhiko Oguri
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Patent number: 4494227Abstract: A phonograph pick-up or cutter has a stylus holder carrying a stylus, which cooperates with two transducers, one for each of two orthogonal directions of vibration. Each transducer has a flat coil and an associated magnet having their axes in line. For each transducer the direction of relative movement of the coil to the magnet corresponds to the direction of the coil axis and the magnetic axis. The stylus holder is connected to the moving parts of the two transducers by a coupling member. Preferably, the moving part is arranged on a support connected to the stationary part, to minimize undesired transverse movements.Type: GrantFiled: March 29, 1982Date of Patent: January 15, 1985Assignee: U.S. Philips CorporationInventors: Casper E. G. M. M. van Vroonhoven, Keimpe van Wijk
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Patent number: 4493071Abstract: The present invention is directed to a pickup cartridge used for reproducing an information recorded on a record disc, the pickup cartridge having a magnet, a stylus which engages a spiral groove on the record disc, a pole piece for forming a path for a magnetic flux generated by the magnet and varied in response to the movement of the stylus and a wire coil wound on the pole piece for producing a signal voltage. The pole piece is made of magnetic material with electrical conductivity, such as permalloy, and is provided with an output electrode portion at one end. One end of the coil wire is connected electrically to the pole piece. The signal voltage is induced in the coil in response to variations in the magnetic flux passing through the pole piece and is fed to the output electrode portion at the end of the pole piece.Type: GrantFiled: February 23, 1982Date of Patent: January 8, 1985Assignee: Sony CorporationInventors: Yoshihisa Mori, Hachisiro Kobayashi, Mitsuru Takashima
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Patent number: 4456984Abstract: A magnetic cartridge such as a pick-up or cutter, whose magnetic circuits are at least partly hollow, the cavities extending mainly in the direction of the magnetic flux. Each magnetic circuit and in particular each polepiece is formed at least partly with a slot communicating with the cavity and extending substantially in the same direction. This reduces eddy-current losses in the magnetic circuit, thereby improving the treble reproduction of the pick-up.Type: GrantFiled: December 22, 1981Date of Patent: June 26, 1984Assignee: U.S. Philips CorporationInventor: Keimpe Van Wijk
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Patent number: 4383310Abstract: A stereo pickup cartridge of a movable magnet type comprising three movable magnets. The magnetic axis of each of the magnets is orthogonal to the cantilever shaft.Type: GrantFiled: October 30, 1980Date of Patent: May 10, 1983Assignee: Matsushita Electric Industrial Co., Ltd.Inventor: Masashi Itoh
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Patent number: 4353125Abstract: A stereophonic electromagnetic pickup cartridge in which each of the right- and left-channel yokes is formed by folding a thin strip of a magnetic material over itself many times like pleats into a U-shape; coils are mounted on the yokes; the bases of the yokes are crossed so that the bases of the yokes are respectively disposed along the lines which are crossed by 90.degree. respectively with the axes of the maximum sensitivity of the right- and left-channels are formed; and an armature is disposed at the open ends of the yokes. Mass production at less costs of high-quality yokes with minimum eddy current loss becomes possible.Type: GrantFiled: November 19, 1980Date of Patent: October 5, 1982Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masashi Itoh, Kazuo Teramae
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Patent number: 4345322Abstract: In a pickup cartridge of the moving magnet type, the components of movement of a cantilever in the vertical and horizontal directions are individually detected to produce two kinds of electromotive forces respectively proportional to the velocity of the detected vertical and horizontal components of movement. The sum and difference signals of the two kinds of electromotive forces are separately obtained for stereophonic reproduction of signals recorded on a recorded disk. The vibration system is given different vibration characteristics for vertical movements thereof than those for horizontal movements thereof, without sacrificing electrical output characteristics such as channel separation characteristic and low frequency response characteristic.Type: GrantFiled: July 18, 1980Date of Patent: August 17, 1982Assignee: Nippon Gakki Seizo Kabushiki KaishaInventors: Kenshiro Aizawa, Hisashi Okada
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Patent number: 4249747Abstract: A magnetic phonograph pick-up cartridge having a fixed assembly portion and a replaceable assembly portion wherein the replaceable portion includes self-contained, longitudinally-extending stylus pole pieces surrounding a pivotally mounted stylus magnet. One end portion of the magnet has a stylus-containing shank connected so that movement of the stylus by a phonograph record groove will cause a related pivotal movement of the magnet. The stylus pole pieces, which could include one or two pole piece pairs, are positioned to define a longitudinally extending pole gap. The magnet has a longitudinal dimension less than that of the pole pieces and is positioned within the pole gap. A resilient collar is attached to the stylus pole pieces and is used to pivotally mount the magnet so that movements of the stylus will alter the magnetic flux coupled from the magnet to the stylus pole pieces.Type: GrantFiled: July 30, 1979Date of Patent: February 10, 1981Inventors: Benjamin B. Bauer, deceased, by Ida Bauer, executrix