Surfaces Pressed Together (e.g., Compressible Type) Patents (Class 338/99)
  • Patent number: 5302936
    Abstract: A pressure transducer includes a base ply, a resistance ply disposed on the base ply and at least two spaced apart contacts juxtaposed in relation to the resistance ply whereby at least one of the contacts may be pressed against the surface of the resistance ply. The resistance ply is made by spraying or silk screening a mixture of resin resistive to electrical conduction and a conductive particulate and then curing the composition to form a thin resistance ply having a surface with a multiplicity of micro-protrusions formed by the conductive particulate. The ratio of conductive particulate to resin is such that the mean distance between microprotrusions is greater than about five time the size of the conductive particles. The particles are in the range of about 0.5 to 10 microns and the resin layer is about is 0.4 to 0.8 microns thick.
    Type: Grant
    Filed: September 2, 1992
    Date of Patent: April 12, 1994
    Assignee: Interlink Electronics, Inc.
    Inventor: Stuart I. Yaniger
  • Patent number: 5296837
    Abstract: A pressure transducer includes a base ply, a resistance ply disposed on the base ply and at least two spaced apart conductors juxtaposed in relation to the resistance ply whereby at least one of the conductors may be pressed against the resistance ply. The resistance ply is made by spraying or silk screening a mixture of a continuous matrix conductive resin and a stannous oxide particulate and then curing the composition to form a solid resistance ply having a surface with a multiplicity of micro-protrusions formed by the stannous oxide particulate.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: March 22, 1994
    Assignee: Interlink Electronics, Inc.
    Inventor: Stuart I. Yaniger
  • Patent number: 5257317
    Abstract: A control console (1) for use in sound recording, and/or effects such as dubbing, the console (1) having a plurality, say 100 of sound channels, the console comprising a touch sensitive channel selector (2) having as many touch sensitive elements (3) as there are selectable channels of the console (1), whereby to select a channel by touch on the selector (2).
    Type: Grant
    Filed: April 29, 1991
    Date of Patent: October 26, 1993
    Inventor: Michael P. Stavrou
  • Patent number: 5231386
    Abstract: A keyswitch-integrated pointing assembly in which a plurality of substantially planar force sensing elements are disposed on a planar surface adjacent a keyswitch on a keyboard. The keyswitch includes a plunger which extends downwardly from a key cap for actuating a switch at the lower end of vertical key cap travel. The key cap engages an indexing surface when fully depressed which transmits force applied to the key cap to the force sensing elements. The force sensing elements are sandwiched between a pair of opposing plates thereby biasing the elements into a substantially linear operating region when no force is applied to the key cap.
    Type: Grant
    Filed: July 24, 1990
    Date of Patent: July 27, 1993
    Assignee: Home Row, Inc.
    Inventors: Eric L. Brandenburg, Patrick J. Franz, David H. Straayer
  • Patent number: 5216193
    Abstract: A bending angle detector is constructed by a flexible base member, a flexible resistor and a detecting circuit. Herein, the flexible resistor is attached on at least one surface of the base member so that the resistance thereof can be varied in response to a bend of the base member. The detecting circuit, coupled to the flexible resistor, detects a bending angle of the base member based on the resistance variation of the flexible resistor. In an electronic musical instrument employing this bending angle detector, there is provided a flexible mounting member having a shape to be put on an articulation portion of a person. At least one storage pouch is formed at the predetermined position of the flexible mounting member to store the bending angle detector therein. Thus, a musical tone signal is formed based on a bending angle of the articulation portion of the person detected by the bending angle detector. Preferably, the flexible mounting member has a glove-like-shape.
    Type: Grant
    Filed: March 29, 1991
    Date of Patent: June 1, 1993
    Assignee: Yamaha Corporation
    Inventor: Takamichi Masubuchi
  • Patent number: 5187315
    Abstract: In construction of a keyboard apparatus in which a plurality of keys are swingably mounted to a fixed key support and change in electric inductance is induced in response to every key operation for adjustment of musical tone control parameters, the change in inductance by an inductance change inducer is detected by at least one planar coil pattern which is arranged such that its mating surface area with the an inductance change inducer should change in correspondence to the key stroke of the key at key operation. Thanks to use of the change in the mating surface area in detection, a linear relationship is obtained between the key stroke and the detection output, which well avoids inter-key variation in detection output for uniform generation of musical tones from different keys.
    Type: Grant
    Filed: March 19, 1990
    Date of Patent: February 16, 1993
    Assignee: Yamaha Corporation
    Inventors: Shigeru Muramatsu, Keisuke Watanabe, Junichi Mishima
  • Patent number: 5151677
    Abstract: The apparatus serves for rapid orientation of a periscope and, if desired, a weapon barrel with respect to a sighted target. A contact potentiometer is proved as angle transmitter for an electric servo control. The contact potentiometer is annularly arranged around the observer's post at the vehicle, preferably in the region of the rim portion of the observation hatch of the vehicle. The contact potentiometer comprises an arcuate, hose-like insulating envelope defining a radial direction. A resistance track and a contact track are laid within the insulating envelope at a predeterminate spacing therebetween in the radial direction of the insulating envelope. By touching the contact potentiometer in the direction of sight, there is tapped thereat a resistance value corresponding to the direction with which the periscope or, if desired, the weapon barrel has to be aligned by a swivelling motion.
    Type: Grant
    Filed: February 4, 1991
    Date of Patent: September 29, 1992
    Assignee: Oerlikon-Contraves AG
    Inventors: Pierre Gernet, Werner Steinemann, Paul-Andre Margot
  • Patent number: 5079949
    Abstract: A detecting element for sensing surface pressure distributions comprising a substantially rigid insulating substrate, a plurality of scanning row electrodes, formed by metal deposition on said substrate, etched to form a pattern of substantially parallel electrodes which are spaced apart and oriented along a first axis, a thin resistive film, deposited on said substrate, having a resistance which varies as a function of contact area, a substantially resilient deformable surface layer, a plurality of scanning column electrodes, formed by metal deposition on said surface layer, etched to form a pattern of substantially parallel column electrodes which are spaced apart, said surface layer being bonded to said substrate by an anisotropic adhesive so that said column electrodes are oriented along a second axis which is perpendicular to said first axis, said surface layer transmitting pressure distribution to said row electrodes, resistive film, and column electrodes to form a matrix of variable contact resistances
    Type: Grant
    Filed: October 16, 1990
    Date of Patent: January 14, 1992
    Assignee: Enix Corporation
    Inventor: Teruhiko Tamori
  • Patent number: 5079536
    Abstract: A pressure-to-conductance transducer, which avoids dependency on pressure-sensitive properties of particulate materials which may be difficult to formulate in stable form, utilizes instead the principle of translating applied pressure into variation of area and region of contact between a resistively coated Mylar tape element and a pair of adjacent contact plates, connected to controlled circuitry via a cable. In an embodiment for foot control of musical effects, a base mounts the contact plates and a surrounding separable Velcro gasket supporting a semi-rigid pressure sensor plate holding the resistive element closely spaced above the contact plates. A void in the element spans the gap between the contact plates. The conductance value appearing between the contact plates varies with the pressure applied to the sensor plate, ranging from low conductance with light offset pressure to high conductance with heavy overall pressure.
    Type: Grant
    Filed: March 5, 1990
    Date of Patent: January 7, 1992
    Inventor: Emmett H. Chapman
  • Patent number: 5070622
    Abstract: To measure the gaps between fuel rods in a fuel assembly, a feeler gauge is provided with a pair of resilient arms having elongated electrical resistance strips carried by their confronting surfaces and extending from terminations adjacent the free ends of the arms through a contact point of electrical inter-engagement. The strip terminations are wired into a metering circuit including a current source and an ammeter. When the arm free ends are positioned in a rod gap, the position of the contact point relative to the strip terminations determines the magnitude of resistance included in the metering circuit, and the meter registers the gap dimension.
    Type: Grant
    Filed: March 1, 1991
    Date of Patent: December 10, 1991
    Assignee: General Electric Company
    Inventors: Donald F. Butzin, Harold B. King, Jr.
  • Patent number: 5068638
    Abstract: A sensing element includes a body of pressure sensitive electrically conductive material formed by a non-conductive matrix of flexible elastomeric material, the matrix containing electrically conductive particles. The body is formed with spaced connection regions, at least one of which is a hole into which an electrical connector may be inserted as a push fit. The connector is oversize in a direction transversely of the hole to ensure that the connector is held in place in the body and makes good electrical connection therewith.
    Type: Grant
    Filed: September 11, 1989
    Date of Patent: November 26, 1991
    Assignee: The Gates Rubber Company
    Inventors: Alan C. Bickely, Travis Moore
  • Patent number: 5014224
    Abstract: In a tactile sensor, a first conductive path made of an electrically resistive material, which is elastic, is fixed to a foil-like base. At points of intersection with good electrically conducting conductive paths, which are fixed to a second elastic foil, the first conductive path has a uniformly curved convex surface. If pressure is exerted on the second flat foil, then the convex surface of the first conductive path is deformed in the area where the pressure is exerted so that, in this area, the first good electrically conducting conductive path presses against the first conductive path over a pressure-responsive longitudinal area, so that the total resistance of the first conductive path changes in a pressure-responsive manner. By measuring the total resistance and the potential of the good electrically conducting conductive paths, the pressure exertion can be determined as to location and amount of pressure.
    Type: Grant
    Filed: July 13, 1989
    Date of Patent: May 7, 1991
    Assignee: Blomberg Robotertecknik GmbH
    Inventor: Richter Hans
  • Patent number: 4989040
    Abstract: A position detector outputs an electrical signal of a level corresponding to a pressed position. The detector has at least three reference points, each reference region begin set therebetween. When the position detector is pressed, the region to which the pressed position belongs is discriminated, and the pressed position is operated relative to the two reference points defining the region, on the basis of the previously stored outputs from the reference points and the output from the pressed position. The position detector has a strip of upper and lower electrode both with wiring members and a grounded conductor provided under the lower electrode. The upper and lower electrodes and the wiring members for the electrodes are disposed so that they are positioned inwardly of the periphery of the conductor at least by the distance equal to that from the upper surface of the upper electrode to the upper surface of the conductor.
    Type: Grant
    Filed: December 20, 1988
    Date of Patent: January 29, 1991
    Assignee: Sharp Corporation
    Inventors: Toshihisa Matsuo, Kazuyuki Ougita, Junichi Kajiwara, Masakiyo Okuda
  • Patent number: 4975676
    Abstract: A glass membrane touch-controlled circuit apparatus for voltage selection. The apparatus has a flexible glass membrane which is spaced by a dielectric layer adhesively joined between the upper flexible glass membrane and a lower, rigid support layer. Conductive circuitry is printed onto the surface of the upper flexible glass membrane and corresponding areas of conductive and/or resistive circuitry are printed onto the lower support layer. By application of tactile pressure to the upper flexible glass membrane, the conductive circuitry printed onto the flexible glass membrane can be moved into a point of momentary contact with the circuitry carried on the lower support layer.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: December 4, 1990
    Assignee: Spectra Symbol Corp.
    Inventor: Verl B. Greenhalgh
  • Patent number: 4940959
    Abstract: A reversible resistant device having the property of being normally non-conductive, but being adapted to being converted to the conductive state. This change in conductive state is achieved by subjecting the device to a high voltage or high electric field. The essence of the device is a normally non-conductive film located between conductive layers, the film being formed by metal oxide coated metal particles embedded in a binder. When subjected to a high a potential, the metal oxide coating loses its dielectric properties and renders the film conductive.
    Type: Grant
    Filed: August 3, 1989
    Date of Patent: July 10, 1990
    Assignee: Pitney Bowes, Inc.
    Inventors: Claude Zeller, Henry A. Mayeski, Charles F. Murphy, III
  • Patent number: 4933660
    Abstract: A touch sensor device, and its method of operation, that provides information as to the position of a touch thereon together with information as to the amount of pressure applied to the sensor at the touch position. The device has a pair of spaced-apart membranous sheets with coatings thereon suitable for the determination of position information in a conventional manner. In addition, switching units are included which, during a given time interval of operation, supply a uniform electrical potential in one of the sheets. During that same interval contacts or electrodes on opposite edges of the second sheet are rapidly switched to alternately be oppositely connected to ground on one edge and to the information processing unit at the other edge. In this manner, there is a fixed potential applied to the contact resistance circuit created between the sheets due to the touch pressure, and the alternate switching averages the potential on the second sheet.
    Type: Grant
    Filed: October 27, 1989
    Date of Patent: June 12, 1990
    Assignee: Elographics, Inc.
    Inventor: James R. Wynne, Jr.
  • Patent number: 4920253
    Abstract: A control device for cooking apparatus includes an input panel for inputting a desired cooking condition. The input panel includes a flexible panel on which a plurality of cooking condition set key-patterns are formed in line. When a desired cooking condition set key-pattern is pressed, the input panel produces a voltage corresponding to the pressed key-pattern. The value of this voltage is changed step by step from one side key-pattern toward the other side key-pattern on the flexible panel.
    Type: Grant
    Filed: January 5, 1989
    Date of Patent: April 24, 1990
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Tamotsu Takei
  • Patent number: 4914416
    Abstract: A pressure-sensing electric conductor, has an elastic electric conductive layer made of silicone rubber, on which a flexible insulating layer made of resin having a number of holes in a form of net pattern is overlaid. The pressure-sensing electric conductor is produced by applying a silicone adhesive compound to which toluene and silicone ink are added over the flexible sheet of resin insulating layer having a number of holes, and adhering said sheet to said electric conductor formed by means of vulcanization into an elastic sheet, and by bonding them together by applying pressure to both sides of the resin insulator and electric conductor.
    Type: Grant
    Filed: August 10, 1988
    Date of Patent: April 3, 1990
    Inventor: Takahiro Kunikane
  • Patent number: 4903002
    Abstract: In the case of a displacement or position transducer, it is provided that a onductor foil (5) is arranged over the resistor track (4), held at a distance from it and able to be pressed with flexible resilience against the resistor track, and that the slide (8) is displaceably arranged above the conductor foil (5), pressing the latter against the resistor track (4), the conductor foil preferably being electrically connected to a conductor track (2) running parallel to the resistor track (4), at a distance from it and electrically separated from it.
    Type: Grant
    Filed: March 25, 1988
    Date of Patent: February 20, 1990
    Assignee: Preh, Elektrofeinmechanische Werke, Jakob Preh. Nachf. GmbH & Co.
    Inventor: Lothar Sachsse
  • Patent number: 4866412
    Abstract: A tactile sensor device, of value in a sensor system for identifying an object by contact, in the form of a first array of parallel elongated lengths of electroconductive material, a second array of parallel elongated lengths of electroconductive material, disposed transverse to the first array so that lengths in the two arrays intersect, and a resilient piezoresistive material disposed in continuous contact with the lengths of electroconductive material in one of the arrays and located between the arrays.
    Type: Grant
    Filed: August 11, 1987
    Date of Patent: September 12, 1989
    Assignee: The Microelectronics Applications Research Institute Limited
    Inventor: Zenon G. Rzepczynski
  • Patent number: 4856993
    Abstract: A contact sensor for detecting points on a grid where the sensor is being contacted on opposing sides by teeth surfaces or other contacting points. The sensor is especially useful for measuring dental occlusion. The contact sensor includes two sets of parallel electrodes which are each formed on a thin, flexible supporting sheet. The electrodes are separated by a thin, pressure-sensitive resistive coating such as molydenum disulphide. Two such electrode structures are oriented at approximately right angles to create a grid where the intersecting electrodes cross separated by the resistive coatings. Several arrangements of resistive coating over electrodes as disclosed. In the absence of an external force, the material between the electrodes sets provides a high resistance between intersecting electrodes. The resistance between electrode intersections changes as pressure on opposite sides of the intersection changes.
    Type: Grant
    Filed: October 2, 1987
    Date of Patent: August 15, 1989
    Assignee: Tekscan, Inc.
    Inventors: William L. Maness, Robert F. Golden, Michael H. Benjamin, Robert M. Podoloff
  • Patent number: 4847586
    Abstract: There provided is a pressure detector accurate in operation and high in reproducibility to have a resistance circuit substrate provided with at least one pair of electrodes and forming a resistance circuit between the electrodes through printing or other means, a block contact maker formed of a conductive elastic material to a shape ready for deforming, which is characterized in that the block contact maker is kept in contact with the resistance circuit substrate at all times, the block contact maker is deformed according as the state shifts from non-pressurized to pressurized to change a contact area gradually with the resistance circuit substrate, thus forming a variable resistance circuit parallel electrically with the resistance circuit substrate.
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: July 11, 1989
    Assignee: Kokoku Rubber Industry Company Limited
    Inventors: Shigenori Tanaga, Hideo Iida
  • Patent number: 4833440
    Abstract: An apparatus for varying impedance includes a first conductive member, a second member associated therewith, and a third wiper member electrically contacting the first and second members. Use of a conductive rolling member as the third wiper member minimizes wear and degradation of all members. Alternately, or in conjunction with a rolling wiper member, use of a conductive elastomer further eliminates wear.
    Type: Grant
    Filed: September 26, 1988
    Date of Patent: May 23, 1989
    Assignee: Eaton Corporation
    Inventor: Guy A. Wojtanek
  • Patent number: 4821013
    Abstract: A pressure sensing device constructed of a high molecular conductor kept in contact at all times with at least one pair of electrodes in a circuit and wherein the resistance of the conductor is sensitive to external forces oppositely applied by an actuator and a spring. Changing of the relative value of the forces changes the conductor resistance thus changing the circuit resistance.
    Type: Grant
    Filed: November 24, 1987
    Date of Patent: April 11, 1989
    Assignee: Kokoku Rubber Technologies Inc.
    Inventor: Hideo Iida
  • Patent number: 4810992
    Abstract: A digitizer pad includes at least two base plys, each having thereon at least three terminals, a resistor ply disposed between two of the terminals with a plurality of conductors extending from each resistor ply which are spaced apart and interleaved with a plurality of conductors extending from each third terminal. The respective base plys' conducting surfaces face each other and are sandwiched about a nonconductive ply that includes a pressure sensitive conductive layer on each side, the area of which layer covers a portion of the area encompassed by the interleaved conductors on each base ply. The resistor plys and conductors on each base ply are at predetermined angles to those on the base ply, hence the conductors of each base ply form two predefined axes. A voltage source is sequentially coupled, by suitable switching means, across a selected pair of terminals on each ply to measure the selected location along the parameter dimension defined by the terminals across which the voltage source is coupled.
    Type: Grant
    Filed: April 19, 1988
    Date of Patent: March 7, 1989
    Assignee: Interlink Electronics, Inc.
    Inventor: Franklin N. Eventoff
  • Patent number: 4796000
    Abstract: Optical and digital potentiometers and controllers. In one embodiment of the invention, a paddle slider is maintained within a housing along with a light source and sensor. The amount of light received by the sensor is a function of the position of the slider and, accordingly, a control signal output may be developed corresponding to the mechanical position of the slider. In other embodiments, light sources are caused to impinge on reflective surfaces which reflect the light through a film onto additional reflective surfaces which direct the light to a sensor. The film may be of varying optical density along the length thereof such that the amount of light received corresponds to the position of the slider, or the film may be digitally encoded such that separate light beams received by the sensor will correspond to a digital position of the slider. In another embodiment, a cylindrical digitally encoded film is rotated between a light source and sensor, thereby varying the output of the sensor.
    Type: Grant
    Filed: April 28, 1986
    Date of Patent: January 3, 1989
    Assignee: David N. Friedland
    Inventor: John T. Mondl
  • Patent number: 4793193
    Abstract: A device for sensing loads comprises rigid first and second members having opposed surfaces and a sensor subjected to compressive loading between the opposed surfaces. The sensor comprises an electrically conductive thin layer of material in conductive engagement with spaced apart conductors so as to provide an electrical path between the conductors through the conductive layer. The surface of the conductive layer is of undulating form whereby the conductive engagement will vary with variation in loading on the sensor.
    Type: Grant
    Filed: December 2, 1986
    Date of Patent: December 27, 1988
    Inventor: Slim T. Borgudd
  • Patent number: 4794365
    Abstract: A coaxial cable pressure sensor having a partially conductive layer of fibres or particles between the inner and outer coaxial conductors whereby pressure applied to the sensor produces a detectable change in resistance of the circuit passing through the partially conductive layer. One or more of the sensors may be incorporated into a vehicle weighing system, preferably in the form of a portable "mat" which may be folded or rolled up.
    Type: Grant
    Filed: October 2, 1986
    Date of Patent: December 27, 1988
    Assignee: Raychem Limited
    Inventor: John H. Dunbar
  • Patent number: 4794366
    Abstract: A key-touch sensor has an electric circuit formed on a first electrically insulating substrate covered with a carbon electrode, an electric circuit formed on a second electrically insulating substrate covered with a carbon electrode which is opposed to the electric circuit on the first substrate across a gap, and a pressure-sensitive electroconductive layer deposited to at least one of the first or second substrates and disposed to fill the gap.
    Type: Grant
    Filed: November 10, 1986
    Date of Patent: December 27, 1988
    Assignee: Toshiba Silicone Co., Ltd.
    Inventor: Ryuji Sakamoto
  • Patent number: 4790968
    Abstract: A process (I), for producing a pressure-sensitive electroconductive sheet by (A), forming conductive circuits or electrodes in a flexible porous substrate and (B), applying, followed by curing a pressure-sensitive conductive paste to either or both sides of the substrate to form a pressure-sensitive conductive layer; and a process (II) for producing a pressure-sensitive electroconductive sheet by (A), forming conductive circuits or electrodes in a flexible porous subhstrate, (B), subsequently applying, followed by curing, a pressure-sensitive conductive paste to either side of the substrate to form a pressure-sensitive conductive layer, and (C), applying, followed by curing, insulating silicone rubber to the side of the substrate on which the pressure-sensitive conductive layer is not formed to form an insulating silicone rubber layer.
    Type: Grant
    Filed: October 7, 1986
    Date of Patent: December 13, 1988
    Assignee: Toshiba Silicone Co., Ltd.
    Inventors: Kazuhiro Ohkawa, Tarou Yamazaki
  • Patent number: 4780701
    Abstract: A potentiometer device including a resistor path and a conductive film spaced therefrom. The film may be brought in contact with the resistor by exerting finger pressure. The tap voltage is stored in a memory and displayed by means of LEDs.
    Type: Grant
    Filed: February 11, 1987
    Date of Patent: October 25, 1988
    Inventor: Siegfried Eppinger
  • Patent number: 4775765
    Abstract: A coordinate input apparatus including transparent upper and lower strip electrodes arranged to confront each other intersectionally with a transparent press-conductive member being placed between the upper and lower electrodes. The electrode arrangement formed on a transparent substrate is fitted on a display screen, allowing the operator to press the coordinate surface by the finger tip while viewing the display. An upper and lower strip electrodes become conductive by being pressed, generating a signal which represents the pressed position on the coordinates.
    Type: Grant
    Filed: November 26, 1986
    Date of Patent: October 4, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Kimura, Seiichi Hayashi, Etsurou Hirose, Masataka Inoue, Hidenobu Takahashi
  • Patent number: 4763534
    Abstract: A pressure sensing device utilizing force transducer ink comprises a resistive region deposited between a first and a second conducting region on a first insulating material, the resistive region electrically coupling the two conducting regions. On a second insulating material, a conducting region is deposited and a layer of force transducer ink is deposited over the conducting region. The two insulating materials are positioned in such a manner that the pressure transducer ink is in contact with the resistive region and separates the resistive and coupled conducting regions from the conducting region. A determination of the force applied to this configuration can be made by measuring the resistance between the first and second conducting regions. According to a second embodiment, a second resistive region and coupled conducting regions replace the conducting region on the second insulating material.
    Type: Grant
    Filed: January 31, 1985
    Date of Patent: August 16, 1988
    Assignee: Robert G. Fulks
    Inventor: Robert J. Hager
  • Patent number: 4756076
    Abstract: This invention pertains to gauge apparatus for measuring liquid levels comprising an elongated electrical sensor adapted to be arranged in upright position while immersed so constructed as to have an electrical resistance which may be varied. The sensor is fabricated by providing a rigid elongated support and securing an elongated array of resistors thereto. A flexible layer of conductive material is then applied to the surface of a sheet of flexible insulated material after which the sheet is secured to the support with the conductive material facing the resistors. After the sheet is secured to the support, it is heated, whereby the sheet will return to a position in spaced relation from the resistors. Further, an elongated planar magnet is secured to the rigid support on the side facing the sheet. The magnet is polarized such that the surface facing the sheet has elongated contiguous opposite poles joined along a straight line. The array of resistors is mounted on the magnet surface.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: July 12, 1988
    Assignee: Tokheim Comporation
    Inventors: Jerry F. Dyben, Stanley S. Wulc
  • Patent number: 4746894
    Abstract: Objects contacted by mechanical fingers cause shunts that are touched at a position to contact resistance strips. Sensing resistance remaining between the shunt contact and one end of the resistance strip indicates position of contact along the finger. Shapes and alignments of objects are sensed by comparing positional information along several fingers.
    Type: Grant
    Filed: January 21, 1986
    Date of Patent: May 24, 1988
    Inventor: Maurice Zeldman
  • Patent number: 4745301
    Abstract: A pressure sensitive electro-conductive material which can be utilized as a pressure sensitive electro-conductive switch or as a variable resistor. The switch comprises two electrodes with a deformable pressure sensitive electro-conductive material sandwiched between the electrodes. The electro-conductive material comprises a deformable elastomeric material impregnated with a plurality of electro-conductive micro-agglomerates of unbound finely divided electro-conductive carbon particles enclosed by a matrix of the elastomeric material and finely divided electro-conductive carbon particles bound together by the elastomeric material.
    Type: Grant
    Filed: December 13, 1985
    Date of Patent: May 17, 1988
    Assignee: Advanced Micro-Matrix, Inc.
    Inventor: Michael Michalchik
  • Patent number: 4739299
    Abstract: A digitizer pad includes at least two sets of terminals where each set has at least a first and second terminal positioned to define a parameter dimension therebetween. A resistor ply is disposed between the terminals of each set. The resistor ply has an electrical contact surface with a resistance gradient profile between the terminals in each set. An output terminal is electrically interconnected to a selected location along the contact surface of the resistor ply. A voltage source is sequentially coupled, by suitable switching means, across a selected subset of terminals in each set of terminals whereby the voltage at the output terminal is a measure of the selected location along the parameter dimension defined by the terminals across which the voltage source is coupled.
    Type: Grant
    Filed: January 17, 1986
    Date of Patent: April 19, 1988
    Assignee: Interlink Electronics, Inc.
    Inventors: Franklin N. Eventoff, Tyrone Christiansen
  • Patent number: 4734034
    Abstract: A contact sensor for detecting points on a grid where the sensor is being contacted on opposing sides by teeth surfaces or other contacting points. The contact sensor includes two sets of parallel electrodes which are each formed of a thin, flexible supporting sheet. The electrodes are coated with a thin, resistive coating. Two such electrode structures are oriented at approximately right angles to create a grid where the intersecting electrodes cross separated by the resistive coatings. The resistive coatings may be made from conventional resisitive inks and are optionally separated by a separation material, such as talcum or mesh. In the absence of an external force, the material between the electrodes sets provides a high resistance between intersecting electrodes.
    Type: Grant
    Filed: March 29, 1985
    Date of Patent: March 29, 1988
    Assignee: Sentek, Incorporated
    Inventors: William L. Maness, Robert F. Golden, Michael H. Benjamin, Robert M. Podoloff
  • Patent number: 4729809
    Abstract: An anisotropically conductive adhesive composition (10) for use in electrically connecting at least one conductive area (14) on one substrate (12) with at least one conductive area (20) on a second substrate (18) is disclosed. The composition (10) is comprised of a mixture of conductive particles and a nonconductive adhesive binder (26). The conductive particles are dispersed throughout the binder in a plurality of noncontiguous conductive units (24) such that, upon applying a layer (30) of the composition (10) over both the conductive and insulating areas (14, 16) on one substrate (12) and positioning in a conducting relationship and adhering said at least one conductive area (20) on the second substrate (18) with said at least one conductive area (14) on the first substrate (12), the units (24) establish electrical connection between the adhered conductive areas (14, 20) on the two substrates (12, 18).
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: March 8, 1988
    Assignee: AMP Incorporated
    Inventors: Ronald A. Dery, Warren C. Jones, William J. Lynn, John R. Rowlette
  • Patent number: 4715235
    Abstract: The deformation sensitive electroconductive knitted or woven fabric of the present invention is a knitted or woven fabric, which can be changed in electroconductivity at the deformed portion when the deformation of stretch or compression is applied thereon by maintaining in the certain ratio of the number of electrically insulating portions to the number of electroconductive portions at the intertwined portions of the fibers and/or the portions between the intertwined portions of the fibers. By using this knitted or woven fabric directly or a deformation sensitive electroconductive sheet having an elastomer laminated on at least one surface of the knitted or woven fabric, it can be utilized as an stretch sensitive electroconductive device or pressure sensitive electroconductive device provided electrodes capable of detecting the changes in electroconductivity corresponding to deformations as electrical characteristics such as electrical resistance.
    Type: Grant
    Filed: February 28, 1986
    Date of Patent: December 29, 1987
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Minoru Fukui, Naoki Kataoka
  • Patent number: 4703663
    Abstract: Force sensor for electric measuring of forces, mechanical stress or the like, which are converted in the interior of the force sensor into a mechanical normal stress field and then into an electric resistance change. Transverse to the normal stress .sigma..sub.j a piezo-resistive measuring element (17) consisting of at least one layer of resistance material is applied whose material constant c is selected such that a mechanical strain of the measuring element resulting from the strain of a carrier body (1) does not influence the measurement. The resistance layers may be overlying crossing patterns M.sub.1, M.sub.2 forming area elements (13) of equal area size which completely exhibits the mutually perpendicular strains .epsilon..sub.x, .epsilon..sub.y of the carrier body (1). For compensating disturbing influences exterior of the normal stress field a compensation element (18) is provided corresponding to the measuring element (17).
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: November 3, 1987
    Inventor: Klaus Oppermann
  • Patent number: 4694231
    Abstract: A multi-layered tactile sensing skin is provided for a robotic arm or the like. The skin includes adjacent layers of electrically insulative film having opposed contiguous surfaces. An electrically conductive carbon based compound is applied uniformly to one of the surfaces, while the other surface is selectively coated with silver oxide to form a series of pairs of first and second electrically conductive regions separated from one another by a dielectric gap. The carbon based conductor bridges the gap betwen the conductive regions in each pair, permitting flow of electrical current between the regions. The current flow increases with an increase in pressure over the interface between the layers of film, and the amperage increase can be utilized to trigger a signal to the robot power supply, to decelerate, stop or reverse arm movement.
    Type: Grant
    Filed: April 18, 1986
    Date of Patent: September 15, 1987
    Assignee: Mecanotron Corporation
    Inventor: Joseph G. Alvite'
  • Patent number: 4659873
    Abstract: A fabric touch sensor for providing positional information related to a touched region/points. The improved electrographic touch sensor (10) is fabricated using at least one resistive fabric layer (12) in the form of conducting threads. This fabric is constructed using either unidirectional threads (16) or crossed threads (16, 18) formed by overlaying one set with another or weaving the two sets together. The fabric (12) is separated from a second resistive layer (14) to prevent unintentional contact, with separators (24) in the form of non-conducting threads (42), insulator dots (24), or with an air gap. In a preferred embodiment, both resistive layers are fabrics (12, 14) formed from conductive threads. Prevention of Moire-type visual patterns is achieved by orienting the threads in one fabric layer at an oblique angle to those of the second fabric layer.
    Type: Grant
    Filed: July 19, 1985
    Date of Patent: April 21, 1987
    Assignee: Elographics, Inc.
    Inventors: William A. Gibson, John E. Talmage, Jr.
  • Patent number: 4651123
    Abstract: A linear potentiometer with a sandwich type construction. A pair of conductive strips are carried on a pair of non-conductive flexible plastic substrates which are affixed to a spacer to form a sealed unit. Each substrate includes a pair of tabs which cooperate with the tabs on the other substrate to define a pair of terminal receiving slots for connecting the potentiometer in an electrical circuit.
    Type: Grant
    Filed: August 6, 1984
    Date of Patent: March 17, 1987
    Assignee: International Hydraulic Systems, Inc
    Inventor: Lawrence P. Zepp
  • Patent number: 4615252
    Abstract: A touch control apparatus for an electronic keyboard instrument, comprises a sensor having: an elongated insulating sheet having a set of conductive pattern films on a surface thereof, the elongated insulating sheet being folded and the set of conductive pattern films being formed to be spaced apart from each other; and a pressure-sensitive element sandwiched in a space defined by the folded elongated insulating sheet to be in contact with the conductive pattern films. The pressure sensitive element is deformed when a key of the instrument is depressed to deliver an electrical output through the conductive films representing the magnitude of the key depression. The apparatus is superior in easiness of handling the sensor and of assembling the apparatus.
    Type: Grant
    Filed: January 25, 1985
    Date of Patent: October 7, 1986
    Assignee: Nippon Gakki Seizo Kabushiki Kaisha
    Inventors: Takao Yamauchi, Yasuhiko Asahi
  • Patent number: 4571542
    Abstract: A method for inspecting printed wiring boards which comprises superposing, on a printed wiring board to be inspected, a pressure-sensitive, electroconductive, elastic sheet, any portions of which become electroconductive in the direction of thickness of the elastic sheet when the portions have been pressed in the same direction, pressing the elastic sheet at portions corresponding to the electroconductive portions of said board by the use of inspecting electrodes, thereby electrically connecting the corresponding inspecting electrodes to the intended electroconductive portions of the printed wiring board.
    Type: Grant
    Filed: June 22, 1983
    Date of Patent: February 18, 1986
    Assignee: Japan Synthetic Rubber Co., Ltd.
    Inventor: Kozo Arai
  • Patent number: 4570149
    Abstract: A touch tablet is provided containing two sheets of insulating material each of which contains a plurality of spaced apart conductive lines. A resistive strip on each sheet contacts and connects electrically one end of each of the plurality of conductive lines on that sheet. Each resistive strip functions as a potentiometer. Mounted between the two sheets and spaced apart therefrom is a conductive middle sheet. The first and second sheets are mounted such that the first and second sets of a plurality of conductive lines on these sheets are orthogonal to each other. A user presses on one of the two sheets to bring all three sheets into contact. The impedence of each potentiometer is a function of the contact point. The potentiometer is used as part of an RC circuit to provide a variable time constant representative of the coordinate of the contact point.
    Type: Grant
    Filed: March 15, 1983
    Date of Patent: February 11, 1986
    Assignee: Koala Technologies Corporation
    Inventors: David D. Thornburg, George M. White, III
  • Patent number: 4555954
    Abstract: A tactile sensor (100) comprises a printed circuit board (102) having a plurality of spaced apart, electrically conductive foils (104) thereon, each coupled to a decoder (106) which selectively applies a voltage individually thereto. The foils are separated from each other by each of a plurality of upraised insulative portions (116) each comprised of a layer of photoresist material. An anisotropically electrically conductive rubber pad (107) having alternating electrically conductive and nonconductive strips (108, 110) overlies the substrate so that the conductive strips are supported in spaced relationship from the conductive foils by the upraised photoresist layers. Each conductive strip is coupled to a multiplexer (115). Upon the application of a force against the rubber sheet, the conductive strips are deformed into electrical contact with the conductive foils on the substrate.
    Type: Grant
    Filed: December 21, 1984
    Date of Patent: December 3, 1985
    Assignee: AT&T Technologies, Inc.
    Inventor: Byoung S. Kim
  • Patent number: 4529959
    Abstract: An input device for use in a display unit serving as a terminal of a computer has first and second insulating sheets and an insulating spacer sandwiched between the first and second sheets. The first sheet has first terminal leads on its both ends, while the second sheet has second terminal leads which extend in perpendicular relation to the first terminal leads. The upper surface is covered with a flexible, insulating, protective sheet. The spacer includes lattice-like conductors and consists of a material having cells of gas and elasticity and flexibility such as silicone foam. A fixed voltage is alternately applied across both ends of the first sheet and across both ends of the second sheet. When the protective sheet is depressed at a point P as by a depression pen, the position of the point is measured and represented by means of X- and Y-coordinates.
    Type: Grant
    Filed: January 31, 1984
    Date of Patent: July 16, 1985
    Assignee: Alps Electric Co., Ltd.
    Inventors: Kazuhiko Ito, Ikuo Utagawa
  • Patent number: 4503416
    Abstract: A layer of carbon fiber materials sandwiched between two conductive layers provides a tactile feedback sensor which is particularly useful in manipulator systems for robotics and assembly automation.
    Type: Grant
    Filed: February 2, 1984
    Date of Patent: March 5, 1985
    Assignee: General Electric Company
    Inventor: Wontaik Kim