Patents Assigned to U.S. Philips Corp.
  • Patent number: 5221844
    Abstract: In an electron microscope correction of spherical and chromatic aberration can be achieved in a number of freely adjustable directions by using a multipole correction element whereby a magnetic or electrostatic octupole field, rotatable about the optical axis, or a combined rotatable magnetic and electrostatic quadrupole field is generated. A corrected overall image can be obtained by combination of images successively corrected in different directions. In the case of holographic images, correction in the direction perpendicular to the line direction in the hologram enhances the accuracy of phase determination. A correction element of this kind, having comparatively small dimensions of from 1 to 2 cm, can be simply mounted, notably in a transmission electron microscope, in a space provided for the stigmator.
    Type: Grant
    Filed: February 18, 1992
    Date of Patent: June 22, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Karel D. van der Mast, Alan F. De Jong
  • Patent number: 5220618
    Abstract: Classification method implemented in a layered neural network, comprising learning steps during which at least one layer is constructed by the addition of the successive neurons necessary for operating, by successive dichotomies, a classification of examples distributed over classes. In order to create at least one layer starting with a group of examples distributed over more than two classes, each successive neuron tends to distinguish its input data according to two predetermined sub-groups of classes peculiar to the said neuron according to a principal components analysis of the distribution of the said input data subjected to the learning of the neuron of the layer in question.
    Type: Grant
    Filed: February 8, 1991
    Date of Patent: June 15, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Jacques-Ariel Sirat, Jean-Pierre Nadal
  • Patent number: 5220619
    Abstract: The position of an object is determined by calculating the coordinates of the center of gravity of the overall image of the object supplied by an image sensor and the coordinates of the centers of gravity of, for example, quadrants converging in the center of gravity of the overall image on the basis of a binary silhouette of the object. These coordinates are compared with desired values in order to change subsequently the orientation of the sensor with respect to the object so that the difference between the coordinates to be calculated and the desired coordinates is minimized. The sensor is moved in orientation and/or position relative to the image sensor in step-wise fashion in order that the image approaches a reference image.
    Type: Grant
    Filed: May 26, 1992
    Date of Patent: June 15, 1993
    Assignee: U.S. Philips Corp.
    Inventor: Robert M. Keokoek
  • Patent number: 5219237
    Abstract: The invention relates to a depilation apparatus of the type with which liquid wax is applied to the skin, which wax is removed together with the hairs after solidification, the apparatus comprising a housing (1) with a reservoir (2) for holding a wax block (3), which reservoir is in connection with an outlet opening (4) in a wall of the housing, the apparatus being provided with a rotatable distributor roller (5) near the outlet opening for applying the liquid wax to the skin. To obtain shorter heating-up times as well as a good sealing for the wax block, the apparatus is provided with a heater element (7) located between the end of the reservoir (2) and the distributor roller (5), while a heat-conducting sealing (10) for the wax block is present near the end of the reservoir (2) facing the distributor roller.
    Type: Grant
    Filed: January 16, 1992
    Date of Patent: June 15, 1993
    Assignee: U.S. Philips Corp.
    Inventor: Maarten H. Zonneveld
  • Patent number: 5216804
    Abstract: A method of placing a component on a printed circuit board by means of a manipulator and a device suitable for carrying out this method, whereby the position of the component is determined with an imaging device. The imaging device makes a picture of the component and of a reference member coupled to the manipulator. The position of the component relative to the manipulator can be directly determined from this picture. The positions of the manipulator and the component relative to the imaging device may also be determined. Using the so determined component position, the component is placed on a printed circuit board in a given orientation so that the component leads are inserted into mating holes in the printed circuit board.
    Type: Grant
    Filed: October 3, 1991
    Date of Patent: June 8, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Willem J. Rosier, Antonius C. M. Gieles
  • Patent number: 5218661
    Abstract: A device for doubling the frequency of a light wave and having a satisfactory waveguide action is obtained in a simple manner by providing, in a nonlinear optical material 11, periodic domains 12 having a reduced second-order susceptibility and an increased refractive index relative to the nonlinear optical material by means of proton exchange or proton implantation. By means of a heat treatment, the refractive index of the material in the periodic domains is reduced to a value which is less than 0.10 higher than that of the nonlinear optical material, thus obtaining a low degree of light scattering.
    Type: Grant
    Filed: November 5, 1991
    Date of Patent: June 8, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Richard B. J. Droste, Ronald R. Drenten, Michiel J. Jongerius
  • Patent number: 5218226
    Abstract: A semiconductor body (100) has a first device region (20) of one conductivity type forming with a second device region (13) of the opposite conductivity type provided adjacent one major surface (11) of the semiconductor body (100) a first pn junction (40) which is reverse-biassed in at least one mode of operation. A floating further region (50) of the opposite conductivity type is provided within the first device region (20) remote from the major surfaces (11 and 12) of the semiconductor body (100) and spaced from the second device region (13) so that, in the one mode, the depletion region of the first pn junction (40) reaches the floating further region (50) before the first pn junction (40) breaks down.
    Type: Grant
    Filed: February 5, 1992
    Date of Patent: June 8, 1993
    Assignee: U.S. Philips Corp.
    Inventors: John A. G. Slatter, Henry E. Brockman, David C. Yule
  • Patent number: 5218646
    Abstract: Classification procedure implemented in a tree-like neural network which, in the course of learning steps, determines with the aid of a tree-like structure the number of neurons and their synaptic coefficients required for the processing of problems of classification of multi-class examples. Each neuron tends to distinguish, from the examples, two groups of examples approximating as well as possible to a division into two predetermined groups of classes. This division can be obtained through a principal component analysis of the distribution of examples. The neural network comprises a directory of addresses of successor neurons which is loaded in learning mode then read in exploitation mode. A memory stores example classes associated with the ends of the branches of the tree.
    Type: Grant
    Filed: February 8, 1991
    Date of Patent: June 8, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Jacques-Ariel Sirat, Jean-Pierre Nadal
  • Patent number: 5216269
    Abstract: Each memory cell of an electrically-programmable semiconductor memory has a field-effect transistor with a charge-storage region. Efficient and fast injection of hot carriers into the charge-storage region is achieved by vertical punch-through of a depletion layer to a buried injector region, by application of programming voltages to a control gate and to the surface of the punch-through region. Non-injected carriers are removed via at least the transistor drain during the programming. A well-defined punch-through region can be obtained with a higher-doped boundary region at at least one side of the punch-through region to restrict the lateral spread of the depletion layer(s) and prevent parasitic connections. This permits closer spacing of the injector region to other regions of the memory cell, e.g. source and drain regions, and the injector region may adjoin an inset insulating field pattern.
    Type: Grant
    Filed: August 8, 1991
    Date of Patent: June 1, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Jan Middelhoek, Gerrit-Jan Hemink, Rutger C. M. Wijburg, Louis Praamsma, Roger Cuppens
  • Patent number: 5216539
    Abstract: Device of the mirror type in the range of X-UV rays, comprises a periodic stack, on a support, of a system of superimposed layers, which system includes a lower layer of a first heavy element reflecting at the wavelengths of application of the mirror, and an upper spacer layer of a light element which has low optical absorption at these wavelengths. The system of superimposed layers comprises, between the lower layer and the upper layer, an intermediate layer of a second heavy element reflecting at the wavelengths of application to form a three-layer system. The heavy elements are selected to form together with the spacer element first and second pairs, first of which has greater absorption at the wavelengths of application and exhibits a ratio of contrast of real and complex indices lower than the other second pair. The heavy element of the first pair forms the lower layer of the three-layer system, the intermediate layer being composed of the heavy element of the second pair.
    Type: Grant
    Filed: May 23, 1991
    Date of Patent: June 1, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Pierre Boher, Philippe Houdy
  • Patent number: 5216512
    Abstract: An imaging system includes an image pick-up device with an image sensor having a rectangular detection face which is subdivided into discrete detection sub-faces for converting a radiation intensity distribution on the detection face into an electric signal, the detection sub-faces being arranged in a matrix of n rows and p columns respectively dividing short and long sides of the detection face, an object plane and an optical system which images a radiation intensity distribution in a circle situated in the object plane onto an ellipse situated on the detection face in accordance with a compression factor m. The compression factor may be chosen so that the ellipse spans no more than p/2 columns of the detection face so that video images can be formed at twice the conventional rate. In the case of non-square detection sub-faces, the compression rate may be chosen so that the ellipse spans an equal number of rows and columns, thereby making each detection sub-face correspond to a square in the object plane.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: June 1, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Antonius J. C. Bruijns, Rudolph M. Snoeren, Bartholomeus G. M. H. Dillen
  • Patent number: 5216354
    Abstract: A voltage-to-current converter in MOS technology includes a signal resistor formed by a channel of a MOS signal transistor (11, 12, 13, 14) with a source electrode and a drain electrode which form terminals of the channel. A gate electrode is provided for connecting a gate voltage (V.sub.g) for adjusting the resistance of the channel and a bulk electrode is provided for connecting a bulk voltage (V.sub.b), and a supply is provided for supplying source, drain, gate and bulk voltages to the electrodes, for non-saturated operation of the signal transistor. The supply includes control circuitry (30) for controlling the bulk voltage in response to the gate voltage. Consequently, the third-order distortion of the voltage-to-current converter is reduced.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: June 1, 1993
    Assignee: U.S. Philips Corp.
    Inventor: Wilhelmus H. G. DeGuelle
  • Patent number: 5216629
    Abstract: The weighting coefficients in the coefficient array (3) of a transversal filter (1) are corrected in accordance with the least mean squares algorithm by adding to each coefficient a correction derived from the product of the content of a stage of the filter shift register (2) and the difference between a signal at the filter output (5) and the output signal of a decision element (15). Each coefficient is corrected only once for each n sample periods of a signal applied to the filter input (7), where n is greater than unity, in order to reduce the amount of computation required during each sample period. Each correction is derived from the output of the filter by inserting n of said differences into the coefficient array as respective weighting coefficients and setting any remaining coefficients to zero.
    Type: Grant
    Filed: March 3, 1992
    Date of Patent: June 1, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Mustafa K. Gurcan, Frank M. De Bekker, David J. Newton
  • Patent number: 5216291
    Abstract: A buffer circuit for buffering an applied reference voltage at a low output impedance. The buffer circuit includes an input transistor which is coupled to an external reference voltage and to an external reference current, and a voltage-to-current converter for applying less or more current to an output terminal of the buffer circuit. This provides a substantially temperature-independent and stable buffer circuit which consumes very little quiescent current.
    Type: Grant
    Filed: April 23, 1991
    Date of Patent: June 1, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Evert Seevinck, Philip D. Costello
  • Patent number: 5213599
    Abstract: In the manufacture of tube glass, in which following the drawing of a tube from molten glass the inside surface of the tube is treated with a chemically reactive gas or gas mixture, a gas or gas mixture which is not reactive at the drawing temperature of the glass is dispensed into the tube in the direction of drawing. At a location in the tube where the tube has cooled down so far that the diameter is constant, the gas or gas mixture is made to react by means of a plasma which is generated in the tube.
    Type: Grant
    Filed: February 19, 1992
    Date of Patent: May 25, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Robert E. M. Geertman, Gerrit Verspui, Johannes A. G. P. Damsteegt
  • Patent number: 5212413
    Abstract: When using a laser programmable fuse, a circuit should be 100% stable both before and after the fuse is blown. So far no CMOS circuit can be 100% stable without drawing a constant current. With the "Master fuse Enable" scheme one fuse circuit (master fuse) draws current while disabling all other fuse circuits on-chip. Thus giving 100% stability and reducing power consumption on a chip where no fusing has been done. If, however, one wished to use the rest of the fuses, then the master fuse is blown and all fuse circuits now become active and draw current.
    Type: Grant
    Filed: July 8, 1991
    Date of Patent: May 18, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Cathal G. Phelan, Peter H. Voss, Thomas J. Davies, Cormac M. O'Connell, Leonardus C. M. G. Pfennings, deceased, Henricus J. Kunnen, legal representative, Hans Ontrop
  • Patent number: 5212590
    Abstract: In a brightness intensifier tube there is provided, preferably in the exit screen or, in the case of a brightness intensifier comprising a channel plate intensifier, on an input electrode thereof, a fixed alignment marker, for example by local burning in of screen material by photoelectrons from the entrance screen which are liberated therefrom by irradiation by a laser beam. For tubes comprising a fixed entrance optical system the alignment marker is preferably provided by focused application of light via the optical system.
    Type: Grant
    Filed: August 13, 1991
    Date of Patent: May 18, 1993
    Assignee: U.S. Philips Corp.
    Inventor: Willy J. P. Bols
  • Patent number: 5207731
    Abstract: An electric shaver (1) is provided comprising a housing (2), a shaving head (5) comprising a shaving foil (7) and a cutter assembly (8) with cutter lamellae (19), and a motor (23) of the rotary type as well as a transmission mechanism (31) acting between the motor (23) and the cutter assembly (8) in order to convert the rotation of the motor shaft (30) into a reciprocating movement to the drive a cutter assembly (8), the motor (23) having a nominal operating speed between 8000 and 10,000 revolutions per minute, wherein the motor (23) is covered with a sheath (32) of an elastic material, the transmission mechanism (31) comprises at least one balancing mass (52), and each of the cutter lamellae (19) of the cutter assembly (8) is provided with an indentation (57, 58) in each of its two side faces (55, 56) which are each bounded by a cutting edge (53, 54), which indentation extends parallel to the cutting edge (53, 54), and exhibits a cutting angle (.beta.) smaller than 90.degree.
    Type: Grant
    Filed: January 16, 1992
    Date of Patent: May 4, 1993
    Assignee: U.S. Philips Corp.
    Inventor: Romuald L. Bukoschek
  • Patent number: 5204869
    Abstract: Radiation-emitting semiconductor diodes in the form of a laser diode or an LED form important components in information processing systems. There is a particular demand for diodes emitting in the visible range of the spectrum and having a high permissible operating temperature. A radiation-emitting diode including a semiconductor body with a semiconductor substrate on which a lower cladding layer, an active layer, and an upper cladding layer are present, the active layer and the two cladding layers each including different semiconductor materials which form a mixed crystal, partly fulfill the above requirements. According to the invention, such a diode is characterized in that the mixed crystal of the active layer is more strongly ordered than that of the two cladding layers. This makes the difference in bandgap between these layers greater than in the known diode. The diode thus has a comparatively high T.sub.o value and accordingly a high maximum operation temperature.
    Type: Grant
    Filed: April 23, 1991
    Date of Patent: April 20, 1993
    Assignee: U.S. Philips Corp.
    Inventors: Adriaan Valster, Coen T. H. F. Liedenbaum
  • Patent number: 5204712
    Abstract: A support device comprises a first and a second bearing unit for guiding the support device along a base surface and a straight guide extending parallel to the base surface, respectively. The support device has an object table which is coupled to a rigidification member and which is displaceable relative to the two bearing units in a z-direction transverse to the base surface and is tiltable about at least one axis of rotation directed parallel to the base surface by three force actuators. The rigidification member is coupled to the second bearing unit by a coupling member which is elastically deformable in the z-direction, and coupled to the first bearing unit via the force actuators, whereby a statically determined coupling of the rigidification member and the object table to the two bearing units is obtained. The support device is particularly suitable for displacements of an object in the sub-micron range, such as, for example, in an optical lithographic device.
    Type: Grant
    Filed: October 9, 1991
    Date of Patent: April 20, 1993
    Assignees: U.S. Philips Corp., A.S.M. Lithography B.V.
    Inventors: Adrianus G. Bouwer, Marcel C. M. Baggen, Henricus W. A. Janssen, Petrus R. Bartray, Jan Van Eijk