Patents Represented by Attorney, Agent or Law Firm Robert J. Kraus
  • Circuit arrangement for powering control circuitry and driving an inductive load from a single DC source
    Patent number: 5514942
    Abstract: A circuit arrangement for driving an inductive load (M) having a first (1) and a second sub-winding (2), which sub-windings can be connected to an energy source (5) via switch devices (9, 10) periodically driven by a controller (16). The source produces a DC voltage (U5) to supply energy to the load (M). Alternatively, the sub-windings are coupled electrically (3) and magnetically (6) like an autotransformer, while voltages (for example U8) for feeding the controller (16) can be tapped from the transformer end terminals (7,8) which are formed by non-interconnected terminals of the sub-windings (1,2). In this circuit arrangement start and operation is ensured with the least possible additional circuitry even if the DC voltage taken from the energy source is less than the supply voltage necessary for the controller.
    Type: Grant
    Filed: November 9, 1993
    Date of Patent: May 7, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Manfred Albach, Theo Husgen
  • Colour display tube including a convergence correction device
    Patent number: 5512802
    Abstract: Convergence correction device for a color display tube comprising a rolled-up flexible support provided with two convergence correction coil systems at its inner surface as well as its outer surface. The coils of each system are of the spiral-shaped type and are interconnected via metallized apertures by means of an electrically conducting strip at the opposite circumferential surface. Dependent on the specific configuration, the flexible support is wound once or twice around the neck of the display tube.
    Type: Grant
    Filed: November 30, 1993
    Date of Patent: April 30, 1996
    Assignee: U.S. Philips Corporation
    Inventor: Jacobus H. T. Jamar
  • Display tube with deflection unit comprising field deflection coils of the semi-saddle type
    Patent number: 5506469
    Abstract: Display tube comprising an electromagnetic deflection unit with field deflection coils of the saddle type having a lying gun-sided lobe which is provided with a plurality of sub-assemblies each comprising two longitudinal conductor groups which are connected at their gun side by means of a connection group of conductors lying flush with the longitudinal conductor groups, the first sub-assembly being arranged within the second, the second within the third, and so forth. Field coma errors, field astigmatism (isotropic and anisotropic) and north-south raster errors can be simultaneously minimized by means of such field deflection coils.
    Type: Grant
    Filed: November 1, 1994
    Date of Patent: April 9, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Nicolaas G. Vink, Johannes Penninga, Johannes A.P. De Volder
  • Thin-type picture display device
    Patent number: 5497046
    Abstract: A picture display device having a vacuum envelope whose inner wall is provided with a luminescent screen. The device is a plurality has a of juxtaposed sources for producing electrons, local transport ducts having walls of electrically substantially insulating material having a secondary emission coefficient which is suitable for transporting, through a vacuum, electron beams, preselection means for withdrawing electrons from the transport ducts at predetermined extraction locations and for directing them towards the luminescent screen for producing a picture composed of pixels. A structure of distribution ducts having selection apertures is positioned between the transport ducts and the luminescent screen for fine selection of electrons withdrawn from the transport ducts.
    Type: Grant
    Filed: March 28, 1995
    Date of Patent: March 5, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus G. P. Van Gorkom, Petrus H. F. Trompenaars, Siebe T. De Zwart, Nicolaas Lambert
  • Compact hybrid microwave choke
    Patent number: 5495217
    Abstract: A microwave choke is provided which includes a lumped-element capacitor, a lumped-element inductor and a transmission line.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: February 27, 1996
    Assignee: Philips Electronics North America Corporation
    Inventor: Jose M. Garcia
  • Flat-panel type picture display device with electron transport ducts and a double selection structure
    Patent number: 5489815
    Abstract: Flat-panel type picture display device having a face plate with a luminescent screen at the inner side and, arranged at a short distance therefrom, a rear plate adjoined by a large number of electron transport ducts operating by means of wall interaction of electrons. An active selection structure for directing electrons from transport ducts towards pixels on the luminescent screen comprises an apertured preselection plate and an apertured fine-selection plate, each preselection aperture being associated with at least two fine-selection apertures. Special auxiliary (or dummy) electrodes between the preselection plate and the selection plate, and/or a special geometry of the preselection apertures, ensure that color purity and contrast are maximal.
    Type: Grant
    Filed: December 29, 1992
    Date of Patent: February 6, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus G. P. Van Gorkom, Siebe T. De Zwart, Petrus H. F. Trompenaars, Nicolaas Lambert
  • Method of making an electrical coil
    Patent number: 5485669
    Abstract: A method for a loop of a predetermined turn of a coil located inside the width of the coil and beneath at least one layer of the coil.
    Type: Grant
    Filed: April 20, 1995
    Date of Patent: January 23, 1996
    Assignee: Philips Electronics North America Corporation
    Inventor: Joseph S. Droho
  • Display tube having a deflection coil support and an auxiliary deflection coil support
    Patent number: 5485054
    Abstract: A display tube having a deflection coil support with a field deflection coil system at its outer side and a line deflection coil system at its inner side. The gun-sided end of the line deflection coil system is situated in a plane parallel to the wall of the display tube. The outer side of the coil support is surrounded by an auxiliary deflection coil system, preferably in a printed form, against the inner and for outer surface of a synthetic material supporting cylinder. This assembly, which can be used particularly for scan velocity modulation purposes, is at least partly arranged between the field deflection coil system and the wall of the display tube, while it partly overlaps the gun-sided end of the line deflection coil system.
    Type: Grant
    Filed: September 28, 1993
    Date of Patent: January 16, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Johannus T. F. Van Kemenade, Cornelis Kortekaas
  • Matrix display device with write-in facility
    Patent number: 5485177
    Abstract: An active matrix liquid crystal display device in which an array of picture elements which include respective switching means, e.g. TFTs, are driven a row at a time by drive signals supplied via a set of row and a set of column address conductors. The device also includes an array of active addressed sensing elements each consisting of a photosensitive element, e.g. a thin film photoresistor or photodiode, a charge storage capacitor and a switching device, e.g. a TFT. The sensing element connected to respective row and column address conductors. The charge storage capacitors are periodically charged through operation of their associated switching devices by the drive signals and are selectively discharged via their associated photosensitive element when illuminated by, for example, a light pen.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: January 16, 1996
    Assignee: U.S. Philips Corporation
    Inventors: John M. Shannon, Alan G. Knapp
  • Vehicle orientation sensor and method with magnetic stabilization
    Patent number: 5481808
    Abstract: A device for determining the orientation of a vehicle includes a magnetic field sensor (3) which is arranged in the vicinity of a ferromagnetic outer wall of the body of the vehicle and which is rigidly connected to the wall. External magnetic fields could unpredictably magnetize the wall portion (1) of the body, in the vicinity of which the magnetic field sensor (3) is provided, so that the measurements would become inaccurate. In order to achieve a substantial reduction of these adverse effects of external magnetic fields, the relevant wall portion is magnetically stabilized, preferably by including it in a magnetic circuit which also includes at least a magnet (11; 23, 27).
    Type: Grant
    Filed: April 10, 1995
    Date of Patent: January 9, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Jacques C. S. Kools, Josef P. M. Naus, Wiepke Folkerts, Martinus A. M. Gijs
  • Transducer circuit having negative integral feedback
    Patent number: 5481905
    Abstract: A transducer circuit which includes a Wheatstone bridge balanced by negative integral feedback. The bridge includes responsive elements formed on a thin resilent diaphragm. When subjected to a force, the diaphragm deflects and unbalances the bridge. The unbalanced bridge produces an output voltage which drives an integrator having an output voltage that is an integral of the bridge output voltage. The integrator output voltage is applied to the bridge as negative feedback to rebalance the bridge. The integrator includes a capacitor which introduces a time delay to assure that the feedback is always negative. The negative feedback provides stability for the circuit. The integrator output voltage drives indicating and/or auxiliary devices. The complete transducer circuit may be disposed within a sealed module having the diaphragm as a surface.
    Type: Grant
    Filed: November 3, 1992
    Date of Patent: January 9, 1996
    Assignee: Philips Electronics North America Corporation
    Inventor: Bud E. Pratt
  • Loudspeaker arrangement with frequency dependent amplitude regulation
    Patent number: 5481617
    Abstract: A known technique to improve bass reproduction in loudspeakers is by boosting amplitude at low frequencies, but this can lead to an overload at high signal level. This can be prevented if the level is detected in order to decrease the amplitude boost. To detect the level in the relevant frequency region, a band or high pass filter before the detector is normally used, but this creates a delay in regulation, so that a high signal peak can introduce audible distortion. The described arrangement prevents this, as the signal is led through a variable band pass filter (10) and directly to the detector (8), which therefore receives the full signal. The arrangement operates such that the lower cut-off frequency of the band pass filter changes so that the lowest frequency range gets the highest attenuation.
    Type: Grant
    Filed: December 7, 1993
    Date of Patent: January 2, 1996
    Assignee: Bang & Olufsen A/S
    Inventor: Egon Bjerre
  • Loudspeaker system
    Patent number: 5479520
    Abstract: An enclosure (35) of a loudspeaker (37) is provided with a plurality of tubes (43) of different length via which the sound is emitted in order to achieve frequency spreading of resonance peaks in the SPL (sound pressure level) curve. The side walls (46, 47) of the tubes (43) have openings (63) via which the tubes are coupled to common Helmholtz resonators (59, 61) in order to suppress undesirable resonances in the tubes (43). By spreading the resonance peaks it is possible to use Helmholtz resonators of smaller dimensions than in the case that the sound would emanate via a single tube. This results in a loudspeaker system (33) with more compact and cheaper Helmholtz resonators (59, 61).
    Type: Grant
    Filed: September 17, 1993
    Date of Patent: December 26, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Joris A. M. Nieuwendijk, Johannes W. T. Bax, Martinus P. M. Van Den Thillart
  • Cathode ray tube
    Patent number: 5460559
    Abstract: Electrodes of an electron gun are etched in an electrochemical bath. The electrodes to be etched serve as the anode in the bath. The side of the electrode to be etched which faces the cathode in the chemical bath, faces an electrode at a higher potential in the assembled electron gun.
    Type: Grant
    Filed: July 12, 1994
    Date of Patent: October 24, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Ronald Van Der Wilk, Gerardus A. H. M. Vrijssen
  • High-frequency amplifier means with enhanced output resistance
    Patent number: 5457427
    Abstract: The input impedance of a high-frequency monolithic integrated-circuit amplifier is modified to increase the maximum output power capability of the amplifier. This modification compensates for a reduction in output resistance at high frequencies caused by feedback capacitance coupling the output and input of the amplifier.
    Type: Grant
    Filed: April 29, 1994
    Date of Patent: October 10, 1995
    Assignee: Philips Electronics North America Corporation
    Inventors: Stephen L. Wong, Jose M. Garcia
  • Compact low-loss microwave balun
    Patent number: 5455545
    Abstract: A microwave balun is constructed by combining a four-transmission-line branch-line coupler with a single-transmission-line delay element. This construction results in a simplified, compact arrangement for combining first and second signals applied to respective first and second ports, phase shifted by 180.degree., and providing the combined signal at a third port. The balun is a reciprocal device and may be operated in reverse with a signal applied to the third port to obtain outputs at the first and second ports.
    Type: Grant
    Filed: December 7, 1993
    Date of Patent: October 3, 1995
    Assignee: Philips Electronics North America Corporation
    Inventor: Jose M. Garcia
  • Control system with driver monitor
    Patent number: 5453929
    Abstract: A vehicle control device such as a steering wheel is equipped with a number of sensors for sensing physiological variations in the human vehicle operator. These sensors are coupled to a master unit (not shown). A rise in the anxiety level of the human operator, which may be due to an impending maneuver, is detected by the master unit via, for example, a rise in skin conductivity, and a signal is provided to other in-vehicle equipment. This signal may be used to delay the provision of non-critical information to the operator, such as navigational data, fuel consumption details or the ringing of a car-telephone.
    Type: Grant
    Filed: December 4, 1992
    Date of Patent: September 26, 1995
    Assignee: U.S. Philips Corporation
    Inventor: Andrew G. Stove
  • Inductive position sensing device and apparatus with selectable winding configuration
    Patent number: 5453685
    Abstract: A variable inductance device for indicating the position of one body relative to another includes primary and secondary windings which are mounted such that one is slidable over the other. The primary winding is wound on a body including annular channels for retaining the winding turns in an arbitrarily selectable turns distribution. The secondary is a shorted winding. A signal producing circuits electrically connected to the primary winding for producing a signal which varies with the device inductance. By selecting the turns distribution such that the device's inductance variation with position and the signal producing circuit's output variation with inductance complement each other, the output signal is made to vary as an arbitrarily selectable function of the position.
    Type: Grant
    Filed: July 30, 1993
    Date of Patent: September 26, 1995
    Assignee: Philips Electronics North America Corporation
    Inventors: Larrie A. Gould, Ernest F. Close
  • Microwave semiconductor device comprising stabilizing means
    Patent number: 5451905
    Abstract: A semiconductor device microwave integrated circuit includes at least a transistor stage which stage includes a microwave matching circuit and a d.c. bias circuit interconnected at a link node (A). The transistor stage further includes a stabilizing circuit which includes an open stub line connected to the link node. The open stub line connected to the link node is a .lambda./4 line which at the operating frequency imposes a short circuit on the link node. A matching circuit made up of a low-value resistor connected to ground in the microwave mode through a d.c. isolating capacitor is connected to the link node. A .lambda./4 line of the radial type (.lambda./4 radial stub) provides broadband operation.
    Type: Grant
    Filed: May 5, 1994
    Date of Patent: September 19, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Patrice Gamand, Christophe Cordier
  • Active matrix display devices
    Patent number: 5448258
    Abstract: An active matrix display device having an array of picture elements (12) comprising capacitive display elements, for example, liquid crystal elements, driven by row and column drive circuits (21,25) via row and column conductors (18,19) in which the column drive circuit (25) supplies multi-bit digital data signals to the column conductors (19) and in which each picture element is configured as a serial charge redistribution digital to analogue converter circuit for providing the analogue voltage required by the display element. The converter circuit can comprise two switching devices (T1,T2), e.g. TFTs, and two capacitors obtained by dividing the display element into two sub-elements (CP1,CP2). Row conductors (18) may be shared between adjacent rows of picture elements.
    Type: Grant
    Filed: October 21, 1993
    Date of Patent: September 5, 1995
    Assignee: U.S. Philips Corporation
    Inventor: Martin J. Edwards