Patents Represented by Attorney William L. Botjer
  • Patent number: 5140150
    Abstract: A brightness intensifier tube is composed of a cylindrical sleeve portion comprising supporting faces acting as reference surfaces for an entrance window and an exit screen so that a vacuum tight tube with exactly positioned parts can be formed by way of seals provided by application of a single compressive load. Because electrodes of an electron optical imaging system are supported by the windows or the sleeve portion in an exactly positioned fashion, assembly produces exact positioning of the electrode system in the tube.
    Type: Grant
    Filed: December 18, 1990
    Date of Patent: August 18, 1992
    Assignee: U.S. Philips Corp.
    Inventor: Johannes C. M. Cosijn
  • Patent number: 5138546
    Abstract: The invention relates to a sintered transformer core of MnZn-ferrite material, the initial permeability of which ranges between 10 and 1000. Said transformer cores preferably have an average particle size which ranges between 0.05 and 2.0 .mu.m. The transformer cores according to the invention exhibit surprisingly low overall losses when operating in the frequency range of 2 MHz and higher. Such transformer cores can be very advantageously used in transformers operated in said frequency range, such as SMPS transformers.
    Type: Grant
    Filed: June 4, 1991
    Date of Patent: August 11, 1992
    Assignee: U.S. Philips Corp.
    Inventors: Mark T. Johnson, Arjan Noordermeer, Marijke M. E. Severin, Eelco G. Visser
  • Patent number: 5134288
    Abstract: A high-resolution electron microscope (1) comprising a detection system (11), an image processing system (13) and an effective electron source (3) ensuring a comparatively small thermal energy spread of the electrons to be emitted is suitable for executing a method for directly deriving amplitude and phase information of an object (17) in the form of an electron wave function .phi.. To this end, a number of images of an object (17) are recorded by means of a high-resolution electron microscope (1) in image planes (19) with defocus values which differ only slightly. Thus, a substantially continuous series of images is formed as a function of the defocus value, resulting in a substantially three-dimensional image area. A quasi-three-dimensional Fourier transformation is performed thereon in order to separate linear and non-linear image information for the reconstruction of the electron wave function.
    Type: Grant
    Filed: July 17, 1991
    Date of Patent: July 28, 1992
    Assignee: U.S. Philips Corp.
    Inventor: Dirk E. M. Van Dijck
  • Patent number: 5126557
    Abstract: An optical heterodyne or homodyne receiver comprises an integrated optical component (140) in which the local oscillator beam and the signal beam are combined and simultaneouly split into orthogonally polarized sub-beams. The optical component comprises a polarization-sensitive beam-splitting layer in a first face (141) and a second beam-splitting layer in a second face (142) which is perpendicular thereto. This second layer functions as a beam-combining element in the optical receiver and has two distinct portions (142a and 142b), one portion (142a) of which passes and reflects one state of polarization (s) to the desired extent and the other portion (142b) having this property for the other state of polarization (p).
    Type: Grant
    Filed: October 2, 1990
    Date of Patent: June 30, 1992
    Assignee: U.S. Philips Corp.
    Inventors: Giok D. Khoe, Kieran G. Wright
  • Patent number: 5126629
    Abstract: Photomultiplier tube (10) segmented into a plurality of elementary photomultipliers (11), comprising a photocathode (12), a plurality of elementary electron multipliers (13) of the "apertured sheet" type, and a plurality of focusing electrodes (14) providing the convergence of the photoelectrons emitted by the photocathode (12) towards the elementary multiplier (13). In accordance with the invention, the homologous sheets (15) of the elementary multipliers are realised on one single segmented conductor wafer (16) having a neutral zone (17) separating the active apertured zones (18) constituting the different multipliers (13). The said focusing electrodes (14) can be made from one single conductor sheet (19) in which feedthrough apertures (20) are punched through which the photoelectrons are passed towards the elementary multipliers (13).
    Type: Grant
    Filed: November 8, 1990
    Date of Patent: June 30, 1992
    Assignee: U.S. Philips Corp.
    Inventor: Herve Chopy
  • Patent number: 5126565
    Abstract: An energy selecting filter comprising a structure of four hemispheres to be transpassed successively by a beam of charged particles to be filtered. The structure is symmetrically with respect to a plane of symmetry in which the energy selecting element, such as slit or a knife-edge is introduced. In a charged particle beam apparatus such as a high resolution electron microscope the energy spread introduced by a source can adjustable be reduced to below for example 0,1 eV without introducing any beam deviation at the cost of only a small lengthening of the apparatus.
    Type: Grant
    Filed: August 6, 1991
    Date of Patent: June 30, 1992
    Assignee: U.S. Philips Corp.
    Inventor: Harald Rose
  • Patent number: 5126985
    Abstract: When information is recorded on a record carrier (1) of the thermomagnetic type, the thermomagnetic recording layer (4) is scanned by a magnetic field generated by a magnetic-field modulator (7). The magnetic field is modulated depending on an information signal (Vi). Moreover, the scanned portion of the record carrier (1) is at the same time locally heated by radiation pulses (10) generated by an optical scanning device (5). By means of radiation pulses (10) the record carrier is heated above a write temperature (Ts), above which temperature the magnetization of the record carrier assumes the direction dictated by the magnetic field. A synchronizing circuit (9) generates the control signal (Vm) for modulating the magnetic field and the control signal (Vr) for generating the radiation pulses, in such a way that at the end of the radiation pulses the field strength is sufficiently high for the heated area of the record carrier to be magnetized in the directio dictated by the magnetic field.
    Type: Grant
    Filed: May 14, 1991
    Date of Patent: June 30, 1992
    Assignee: U.S. Philips Corp.
    Inventors: Johannes H. M. Spruit, Hendricus F. J. J. Van Tongeren, Piet F. Bongers, Bernardus A. J. Jacobs
  • Patent number: 5122657
    Abstract: The device is provided with an optical fiber bundle (5) having a first linear end face (9) at the document side and a second end face (11) whose shape is adapted to the shape of the detection system (3).To reduce the quantity of disturbing light from the light source (43; 61, 62; 44), which may reach the detection system (3), to a maximum possible extent, and to increase the quantity of signal light from the document (1), the second end face (11) is provided with an optical system (13, 14; 50; 70) for an improved coupling in and for reflections. The first end face (9) may also be provided with an optical system (16, 17) for reducing unwanted reflections.
    Type: Grant
    Filed: September 12, 1990
    Date of Patent: June 16, 1992
    Assignee: U.S. Philips Corp.
    Inventors: Johannes H. De Bie, Leopold C. M. Beirens
  • Patent number: 5122666
    Abstract: An infrared detection device, e.g. for the 8 to 14 micrometer waveband, comprises a Langmuir-Blodgett or other very thin film (10) having pyroelectric or other temperature-dependent characteristics. At least one detector element having opposite electrical conductors (21 and 22) is formed in the film (10). The film (10) which may have a support layer (15) is mostly free of contact with a mount arrangement (25) which supports the film (10) in a very low thermally-conductive manner. In accordance with the present invention, the film (10) is very thin, but very efficient absorption of the radiation (31) is obtained in the following manner: the facing surface (26) of the mount arrangement (25) is reflective for the radiation (31); the sum of the optical thicknesses of the film (10), of any support layer (15) and (d) of a gap (28) forming the multiple layer detector-element structure along the radiation path to the reflector (26) is approximately one quarter of a selected wavelength (e.g. 9.
    Type: Grant
    Filed: September 12, 1990
    Date of Patent: June 16, 1992
    Assignee: U.S. Philips Corp.
    Inventor: Andrew A. Turnbull
  • Patent number: 5120444
    Abstract: Devices for and a method of manufacturing glass bodies, in which a porous green body is formed from the starting material for the glass body, being an aqueous suspension comprising a highly disperse solids content, which green body is then purified and sintered, and deposited by separating the phases of the suspension through electrophoresis, in such a manner that the solids content of the suspension is deposited on a porous deposition membrane having pores whose diameter is smaller than the average particle diameter of the solid particles present in the suspension, said membrane being arranged between the anode and the cathode, and the space between said membrane and the anode being filled with an electrically conducting liquid, a porous auxiliary membrane being arranged between and at a distance from the deposition membrane and the cathode, said auxiliary membrane having pores with a diameter which is smaller than the average particle diameter of the solid particles present in the suspension, and the space
    Type: Grant
    Filed: March 13, 1991
    Date of Patent: June 9, 1992
    Assignee: U.S. Philips Corp.
    Inventor: Rolf Clasen
  • Patent number: 5119227
    Abstract: An optically switchable device (1) has a heterostructure (2) defining a first potential well (3) separated by a barrier layer (4) from a second potential well (5) which provides an electron energy level (e.sub.5) which is lower in electron energy than the lowest electron energy level (e.sub.3) of the first potential well (3). The barrier layer (4) provides an intermediate electron energy level (e.sub.4) and is sufficiently thick to inhibit tunnelling of holes from the first (3) to the second (5) potential well. The barrier layer (4) thus confines holes of electron-hole pairs generated in the first potential well (3) by an incident optical beam to the first potential well (3) while facilitating transfer of the electrons from the first potential well (3) to the second potential well (5) via the intermediate electron energy level (e.sub.4) provided by the barrier layer (4).
    Type: Grant
    Filed: September 23, 1991
    Date of Patent: June 2, 1992
    Assignee: U.S. Philips Corp.
    Inventors: Philip Dawson, Jeffrey J. Harris, John W. Orton
  • Patent number: 5117156
    Abstract: A rapid start fluorescent lamp having an improved hot restarting time. The lamp includes the standard envelope and end cap through which electrical connection is made by conductive feedthroughs which extend through the lamp stem to the interior of the lamp. One of the feedthroughs is connected to the cathode, and the other is connected to the leads of a fuse element which is contained within an envelope to isolate the fusible element from the lamp environment. A thermally activated bimetallic element is disposed across the leads of the fuse. The other lead of the fusible element is connected to the other end of the cathode. When the bimetal element is cold, it will bridge the connection between the other feedthrough to the other end of the cathode to permit rapid starting. When the bimetal heats up, the connection of both ends of the cathode to the heating current is broken. The location of the bimetallic element within the lamp envelope but not in the fuse container permits it to open and close more rapidly.
    Type: Grant
    Filed: December 6, 1990
    Date of Patent: May 26, 1992
    Assignee: North American Philips Corp.
    Inventors: Thomas O. Leyh, Walter A. Boyce
  • Patent number: 5115460
    Abstract: An X-ray analysis apparatus comprises an adjustable entrance slit which consists of two laminations which are rotatable about axes extending parallel to a .theta.-axis. By choosing the radius of the laminations and their position in the X-ray beam, a substantially more accurate adjustment can be achieved notably for small .theta.-values. Moreover, asymmetry in the beam path can be simply compensated for and improved shielding against scattered radiation is achieved.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: May 19, 1992
    Assignee: U.S. Philips Corp.
    Inventor: Roelof De Lange
  • Patent number: 5111054
    Abstract: A heat-actuated valve is inserted between a first vacuum space and a further vacuum space in a particle beam apparatus. The valve is preferably activatable by the temperature required for evacuating first vacuum chamber by heating. Preferably, the valve device itself is also evacuatable by heating; this can be readily realized by avoiding the use of non-metal valve members when the valve is inserted between two spaces wherebetween a compartively small absolute difference in pressure exists, in the closed condition of the valve.
    Type: Grant
    Filed: January 4, 1991
    Date of Patent: May 5, 1992
    Assignee: U.S. Philips Corp.
    Inventor: Hendrik N. Slingerland
  • Patent number: 5099120
    Abstract: In a thermal-radiation detection system, the thermal radiation (3) incident on a group of pyroelectric and/or ferroelectric infrared detector elements (20) is modulated at a frequency (f). The detector elements (20) are mounted on flexible platform areas of an insulating substrate (10) which may be of an elastic material such as a silicone rubber in, for example, an apertured or recessed mount (18,19). The grooves (15,16) forming the platform areas have a sufficient depth d and width w that the distance (2d+w) is at least as large as the thermal diffusion distance at the modulation frequency (f) so as to reduce thermal cross-talk between the detector elements (20). The elasticity and vibration absorption properties of an elastic substrate (10) and the flexibility and path length increased by the presence of the grooves (15,16) can provide a low microphony mounting arrangement with acoustic decoupling between detector elements (20).
    Type: Grant
    Filed: June 19, 1990
    Date of Patent: March 24, 1992
    Assignee: U.S. Philips Corporation
    Inventor: Andrew A. Turnbull
  • Patent number: 5097243
    Abstract: Thin-film transformer, for example suitable for use in a thin-film magnetic head, comprising a magnetic yoke composed of two magnetically permeable thin layers 3 and 5 and a primary turn constituted by an electrically conducting thin layer 13 and a secondary turn constituted by an electrically conducting thin layer 15. A thin layer 21 of a superconducting material is provided between the layer 3 and the said turns, or the turns are closely fitted together and made of a superconducting material themselves.
    Type: Grant
    Filed: March 8, 1990
    Date of Patent: March 17, 1992
    Assignee: U.S. Philips Corp.
    Inventors: Victor Zieren, Jacobus J. M. Ruigrok
  • Patent number: 5093577
    Abstract: A degree of contamination can be measured in a charged particle beam system by means of a contamination monitor which is provided with a carrier having an aperture for transmitting a charged particle beam and a membrane which is connected to the carrier and which covers the aperture. The thickness of a contamination layer deposited on the membrane can be determined by measurement of a decrease of the transmission of the membrane as the contamination increases. The accuracy of measurement is enhanced by selecting a central portion of the particle beam transmitted by the membrane.
    Type: Grant
    Filed: November 8, 1990
    Date of Patent: March 3, 1992
    Assignee: U.S. Philips Corporation
    Inventors: Johannes A. de Poorter, Johannes F. C. M. Verhoeven
  • Patent number: 5093566
    Abstract: Via the shape of the photocathode surface and the geometry and potential distribution of electrodes of the electron-optical system, an X-ray image intensifier tube is optimized for reduction of the transit time variance for photoelectrons from the photocathode surface to a photoelectron detector. The photoelectron detector, on which an image need not be formed in this case, has, for example, a comparatively small entrance surface and is arranged in or near a cross-over of the photoelectrons.
    Type: Grant
    Filed: June 29, 1990
    Date of Patent: March 3, 1992
    Assignee: U.S. Philips Corporation
    Inventor: Gerardus Van Aller
  • Patent number: 5091651
    Abstract: In an object holder which is intended for use in a charged particle beam system and which comprises a heating element there is provided an object carrier which cooperates with the heating element and which comprises an electrically insulating member having a supporting face and an aperture which reaches as far as the supporting face and which serves for the transmission of a charged particle beam, at least two current-conductive portions being connected to said insulating member, said contact portions contacting the object when the object is arranged on the supporting face. An object carrier of this kind enables electromigration studies in the object at high temperatures by application of a current through the object via the contact portions.
    Type: Grant
    Filed: October 19, 1990
    Date of Patent: February 25, 1992
    Assignee: U.S. Philips Corp.
    Inventor: Robin Hokke
  • Patent number: 5090980
    Abstract: A method of producing glass bodies having regions with different optical refraction, including a basic body and a coating layer which is sintered onto the basic body, covers the basic body at least partially and is made of glass, which as it is doped, has an index of refraction differing from that of the glass of the basic body. The starting material for producing the cladding on the basis of pulverulent ceramic material is deformed into a self-supporting, unsintered porous green body, is dried and submitted to a cleaning procedure in a heated gas phase. The coating layer to be bonded onto the basic body is melted into glass in a subsequent combined doping/sintering procedure in a gas phase containing the doping agent at a temperature in the range from 1150.degree. to 1500.degree. C. and is sintered onto the basic body.
    Type: Grant
    Filed: April 10, 1990
    Date of Patent: February 25, 1992
    Assignee: U.S. Philips Corp.
    Inventor: Rolf Clasen