Patents Assigned to OSRAM
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Patent number: 7170236Abstract: A method of converting a line voltage to a desired RMS load voltage in a lamp includes the steps of pulse width modulating a load voltage with a pulse width modulation circuit, triggering conduction in the pulse width modulation circuit independently of a line voltage magnitude with a time-based signal source that defines a duty cycle of the pulse width modulation circuit, and adjusting the RMS load voltage to the desired RMS load voltage by adjusting the triggering of conduction in the pulse width modulation circuit based on a comparison of the RMS load voltage to a reference.Type: GrantFiled: June 15, 2005Date of Patent: January 30, 2007Assignee: Osram Sylvania Inc.Inventors: Ernest C. Weyhrauch, Matthew B. Ballenger, George B. Kendrick
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Patent number: 7170228Abstract: A ceramic arc tube having an integral susceptor for RF inductive sealing is described. The integral susceptor in the form of an electrically conductive coating is applied directly to the surface of the arc tube in the seal region. This enables RF heating which is sufficient to melt a frit material and hermetically seal the arc tube. The integral susceptor further provides for a more controlled placement of the seal.Type: GrantFiled: June 30, 2004Date of Patent: January 30, 2007Assignee: Osram Sylvania Inc.Inventors: Arlene Hecker, Gregory Zaslvasky, Ernest Davey, Jr., Dana Caldwell
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Patent number: 7165990Abstract: A wire connector (10) has an electrically insulating housing (12) with a bottom surface (14) for attachment to a base (16) and an upper surface (18) having a wire-receiving groove (20) formed therein. An electrical contact receiving position (22) is formed with the upper surface (18) adjacent the wire receiving groove (20) and an electrical contact (24) is fixed at the electrical contact receiving position (22). The electrical contact (24) has a tail (26) extending into the wire-receiving groove (20). A cover receiving position (28) is formed with the upper surface (18) and spaced from the electrical contact receiving position (22); and an electrically insulating cover (30) is fixed at the cover receiving position (28), the cover including a wire engaging portion (32) projecting into the wire receiving groove (20).Type: GrantFiled: July 31, 2006Date of Patent: January 23, 2007Assignee: Osram Sylvania Inc.Inventors: Michael F. Scholeno, Shane M. Brown
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Patent number: 7166964Abstract: A lamp includes a voltage conversion circuit entirely within a lamp base. The voltage conversion circuit includes a pulse width modulator for modulating a lamp load voltage and provides a load voltage to a light emitting element. A feed-back circuit adjusts the pulse width modulator in response to the load voltage to cause an RMS load voltage to reach a predetermined level.Type: GrantFiled: June 15, 2005Date of Patent: January 23, 2007Assignee: Osram Sylvania Inc.Inventors: Ernest C. Weyhrauch, Matthew B. Ballenger, George B. Kendrick
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Patent number: 7166955Abstract: An LED light source (10) has a housing (12) with a base (14) and a hollow core (16) projecting from the base (14), the core (16) being substantially conical. A first printed circuit board (18) is fitted to the base (14). A second printed circuit board (20) is fitted to the narrow end (22) of the core (16), the second printed circuit board (20) having at least one LED (24) operatively fixed thereto. A plurality of electrical conductors 26 is provided having proximal ends (28) attached to and extending from the second printed circuit board (20) and distal ends (30) attached to and projecting through the first printed circuit board (18). A cap (32) is fitted over the second printed circuit board (20) and a heat sink (34) is attached to the base (14) and in contact with the distal ends (30) of the electrical conductors (26). The housing (12) is provided with flanges for engaging a suitable opening in the rear of a reflector.Type: GrantFiled: May 5, 2004Date of Patent: January 23, 2007Assignee: Osram Sylvania Inc.Inventors: Charles M. Coushaine, Ralph J. Johnson, Russell Holden, John P. Sanroma
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Patent number: 7166007Abstract: A method of encapsulating a device is disclosed. Spacer particles are randomly located in the device region to prevent a cap mounted on the substrate from contacting the active components, thereby protecting them from damage. The spacer particles are fixed to one side of the substrate to prevent any movement.Type: GrantFiled: November 4, 2004Date of Patent: January 23, 2007Assignees: Osram Opto Semiconductors GmbH, Institute of Materials Research and EngineeringInventors: Mark Auch, Ewald Guenther, Lim Shuang Fang, Chua Soo Jin
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Publication number: 20070012927Abstract: In a radiation-emitting optoelectronic semiconductor chip comprising an active layer (3) at least one p-doped layer (9) and a layer sequence (8) comprising a plurality of undoped layers (4, 5, 6, 7), which is arranged between the active layer (3) and the p-doped layer (9) and contains at least a first undoped layer (5) and a second undoped layer (6), the second undoped layer adjoining the first undoped layer (5) and succeeding the first undoped layer (5) as seen from the active layer (3), the first undoped layer (5) and the second undoped layer (6) in each case contain aluminum, the aluminum proportion being greater in the first undoped layer (5) than in the second undoped layer (6). The layer sequence (8) advantageously acts as a diffusion barrier for the dopant of the p-doped layer.Type: ApplicationFiled: June 28, 2006Publication date: January 18, 2007Applicant: Osram Opto Semiconductors GmbHInventor: Norbert Linder
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Patent number: 7164158Abstract: An electrical contact for an optoelectronic device which includes a mirror layer (2) of a metal or a metal alloy, a protective layer (3), which serves for reducing the corrosion of the mirror layer (2), a barrier layer (4), a coupling layer (5), and a solder layer (8). A contact of this type is distinguished by high reflectivity, good ohmic contact with respect to the semiconductor, good adhesion on the semiconductor and good adhesion of the layers forming the contact with one another, good thermal stability, high stability with respect to environmental influences, and also solderability and patternability.Type: GrantFiled: February 26, 2004Date of Patent: January 16, 2007Assignee: Osram Opto Semiconductors GmbHInventors: Wilhelm Stein, Michael Fehrer, Johannes Baur, Matthias Winter, Andreas Ploessl, Stephan Kaiser, Berthold Hahn, Franz Eberhard
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Patent number: 7160633Abstract: Poly-siloxane material may be used to form an insulating structure in an organic light-emitting device (OLED). In addition to the insulating structure, an OLED may have an electro-luminescent organic layer separated into light-emitting elements, e.g., display pixels, arranged between electrode layers. A voltage applied across the electrode layers causes the device to emit light. One type of insulating structure may be a bank structure formed from a thin sheet of poly-siloxane with apertures corresponding to the display pixels. Pixels may be formed with the deposit of one or more layers of organic material into the apertures. Another type of-insulating structure may be one or more insulating strips, which may separate an electrode layer into electrode strips during construction and/or insulate electrode strips while the OLED is in operation.Type: GrantFiled: November 6, 2003Date of Patent: January 9, 2007Assignee: Osram Opto Semiconductors GmbHInventors: Elizabeth Tai, Matthias Stocssel
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Patent number: 7161306Abstract: An apparatus and method for powering a lamp connected to a ballast circuit. The ballast circuit is connected to a first alternating current (AC) source having a first phase and to a second AC source having a second phase for powering the lamp. A first switching circuit is connected between the first AC source and a rectifier circuit. A second switching circuit is connected between the second AC source and the rectifier circuit. A control circuit selectively energizes the first and second switching circuits to provide power from one of the first and second AC sources to the lamp load via the rectifier circuit and an inverter circuit. A detection circuit connected between the first and second AC sources generates a detection signal indicating whether power is being supplied by each the first and second AC sources. The detection signal is provided to a dimming regulation circuit to generate a dim level command signal for dimming the lamp.Type: GrantFiled: March 31, 2005Date of Patent: January 9, 2007Assignee: Osram Sylvania, Inc.Inventors: Thotakura Venkata Ravindra, Ayan Kumar Choudhury
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Patent number: 7157928Abstract: One embodiment of this invention pertains to a high throughput screening technique to identify current leakage in matrix-structured electronic devices. Because elements that are likely to develop a short have relatively high leakage current at zero operation hours, by identifying elements with the relatively high leakage current, the electronic devices that are more likely to later develop a short can be differentiated. The screening technique includes performing the following actions: selecting one of multiple first lines; applying a first voltage to the selected first line; applying a second voltage to the one or more of the first lines that are not selected; floating the multiple second lines; and measuring the voltages on the second lines, either sequentially one line at a time or measuring all the lines at the same time.Type: GrantFiled: September 28, 2004Date of Patent: January 2, 2007Assignee: Osram Opto Semiconductors GmbHInventors: Franky So, Florian Pschenitzka, Egbert Hoefling
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Patent number: 7157845Abstract: A single-component, yellow-emitting electroluminescent phosphor, a method for making same, and an electroluminescent lamp containing same, are described. The phosphor produces a yellow emission having an x color coordinate from 0.420 to 0.500 and y color coordinate from 0.420 to 0.460 when stimulated by an electric field.Type: GrantFiled: September 29, 2004Date of Patent: January 2, 2007Assignee: Osram Sylvania IncInventor: Xianzhong Chen
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Publication number: 20060290285Abstract: A ceramic metal halide lamp is provided wherein the ceramic discharge vessel is comprised of dysprosium oxide. The lamp has a warm-up time that is less than about 50%, and preferably less than about one-third, of the warm-up time of a similarly constructed and operated lamp having a ceramic discharge vessel made of polycrystalline aluminum oxide.Type: ApplicationFiled: June 24, 2005Publication date: December 28, 2006Applicant: OSRAM SYLVANIA INC.Inventors: Walter Lapatovich, George Wei, Joanne Browne
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Publication number: 20060290284Abstract: A method of making a mercury-free fluorescent lamp in which a layer of phosphor particles are applied to an exterior surface of the lamp envelope, includes preparing a sol-gel precursor solution that, when dried, leaves a sol-gel residue material, such as thin film SiO2, that coats the phosphor particles and resists removal of the phosphor particles from the exterior surface, dipping the envelope into the sol-gel precursor solution, and, after removing the envelope from the solution, drying the sol-gel precursor solution to form a network of the sol-gel residue material on the exterior surface that meshes with the layer of phosphor particles. The sol-gel residue material attaches the phosphor particles to the exterior surface with sufficient strength so that the lamp can be handled as if the layer of phosphor particles were on the interior of the envelope.Type: ApplicationFiled: June 28, 2005Publication date: December 28, 2006Applicant: OSRAM SYLVANIA Inc.Inventors: Keith Klinedinst, Philip Moskowitz
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Patent number: 7154229Abstract: An electronic ballast (10) for powering at least one gas discharge lamp (30) includes a current-fed resonant inverter (300) and a load shed circuit (600). Inverter (300) ordinarily powers the lamp at a first level. When a load shed command is sent by the electric utility and received by an associated load shed receiver within the ballast (10), load shed circuit (600) causes the inverter to reduce the lamp power from the first level to a second level. Preferably, load shed circuit (600) includes an isolation circuit (620) and a bidirectional switch (640) that is coupled in parallel with a return ballasting capacitor (388) within inverter (300). In the absence of a load shed command, bidirectional switch (640) effectively shunts return ballasting capacitor (388), which causes the lamp to be powered at the first level. In response to a load shed command, bidirectional switch (640) ceases to shunt return ballasting capacitor (388), thereby causing the lamp power to be reduced to the second level.Type: GrantFiled: November 4, 2004Date of Patent: December 26, 2006Assignee: Osram Sylvania, Inc.Inventors: Felix I. Alexandrov, Joseph L. Parisella, Thomas J. Schalton
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Publication number: 20060284493Abstract: A lamp includes a voltage conversion circuit entirely within a lamp base. The voltage conversion circuit includes a pulse width modulator for modulating a lamp load voltage and provides a load voltage to a light emitting element. A feed-back circuit adjusts the pulse width modulator in response to the load voltage to cause an RMS load voltage to reach a predetermined level.Type: ApplicationFiled: June 15, 2005Publication date: December 21, 2006Applicant: OSRAM SYLVANIA INC.Inventors: Ernest Weyhrauch, Matthew Ballenger, George Kendrick
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Publication number: 20060284192Abstract: In a radiation-emitting semiconductor component with a layer structure comprising an n-doped confinement layer, a p-doped confinement layer, and an active, photon-emitting layer disposed between the n-doped confinement layer and the p-doped confinement layer, it is provided according to the invention that the n-doped confinement layer is doped with a first n-dopant (or two mutually different n-dopants) for producing high active doping and a sharp doping profile, and the active layer is doped with only one second n-dopant, different from the first dopant, for improving the layer quality of the active layer.Type: ApplicationFiled: June 25, 2004Publication date: December 21, 2006Applicant: OSRAM OPTO SEMICONDUCTORS GMBHInventors: Rainer Butendeich, Norbert Linder, Bernd Mayer, Ines Pietzonka
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Publication number: 20060284492Abstract: A lamp includes a voltage controller that converts a line voltage to a desired RMS load voltage. The voltage controller is entirely within a lamp base and uses pulse width modulation to define the RMS load voltage. The voltage controller has a feed-back circuit that adjusts the RMS load voltage to a desired voltage based on a comparison to a preset reference. The voltage converter also includes a switching transistor that pulse width modulates lamp current and that is responsive to the feed-back circuit. The feed-back circuit may be included in a microcontroller that has a time-based signal source that triggers the transistor, a comparator that compares the load voltage to a reference, and a program that adjusts the time-based signal source based on the comparison so as to provide the desired RMS load voltage.Type: ApplicationFiled: June 15, 2005Publication date: December 21, 2006Applicant: OSRAM SYLVANIA INC.Inventors: Ernest Weyhrauch, Matthew Ballenger, George Kendrick
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Publication number: 20060284494Abstract: A method of converting a line voltage to a desired RMS load voltage in a lamp includes the steps of pulse width modulating a load voltage with a pulse width modulation circuit, triggering conduction in the pulse width modulation circuit independently of a line voltage magnitude with a time-based signal source that defines a duty cycle of the pulse width modulation circuit, and adjusting the RMS load voltage to the desired RMS load voltage by adjusting the triggering of conduction in the pulse width modulation circuit based on a comparison of the RMS load voltage to a reference.Type: ApplicationFiled: June 15, 2005Publication date: December 21, 2006Applicant: OSRAM SYLVANIA INC.Inventors: Ernest Weyhrauch, Matthew Ballenger, George Kendrick
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Patent number: 7150553Abstract: Open LED chips may be arranged directly on the surface of a replaceable lamp capsule without intervening packages that reduce overall light emission. The chips may be oriented in such a way that the lamp generates a unique “donut” shape radiation pattern, which is suitable for a flat and shallow secondary optics to collimate the light into a desired beam pattern, and to reduce the unaesthetic appearance of points of light in an onlooker's view. The LED chips are driven in such a way that one chip fails, the whole lamp fails to avoid a partially lit appearance. At the same time the heat generated by the LED chips may be conducted away by the support structure to possibly vehicle's sheet metal to enhance life of the LED chip. The standardization of this LED lamp makes this product more cost effective thus to be used in broader lighting applications.Type: GrantFiled: August 22, 2003Date of Patent: December 19, 2006Assignee: Osram Sylvania Inc.Inventors: George J. English, Kun Huang, Robert L. Garrison