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| Number | Title | Issue Date |
| 8072148 | Fluorescent lamp driving device and liquid crystal display apparatus using the same A fluorescent-lamp-driving device contains a driving control circuit that receives direct current power voltage and a lamp control signal for performing drive control on fluorescent lamps and converts the direct current power voltage to alternating current power vol... | 12/06/2011 |
| 7808183 | Arrangement for the regulation of the electron beam power of an electron gun An arrangement for the regulation of the electron beam power of an electron gun, which comprises a filament cathode, a block cathode and an anode. Between the filament cathode and the block cathode is applied a first voltage, while between the block cathode and the ... | 10/05/2010 |
| 7247991 | Dimming ballast and method A ballast lamp circuit and method of operation is disclosed. The ballast lamp circuit comprising an inverter circuit and cathode heating circuit, wherein a lamp current, generated by the inverter circuit, is inversely proportional to a lamp cathode voltage generated... | 07/24/2007 |
| 6933676 | Driver circuit for a vacuum fluorescence display A vacuum fluorescence display has a plurality of heating regions and heating inputs corresponding thereto. A driver circuit for the VFD has a driver module with a pulse width-modulatable output connected by way of a distributor to a plurality of heating inputs of th... | 08/23/2005 |
| 6911789 | Power supply for a hot-filament cathode In accordance with one embodiment of the present invention, there is provided a switch-mode power supply to generate the heating current for a hot-filament electron-emitting cathode. The power supply directly couples, without an output transformer, the output from a... | 06/28/2005 |
| 6828717 | Electron gun having short length and cathode-ray tube apparatus using such electron gun The present invention provides an electron gun which includes an electrically non-conductive substrate through which a perforation is provided. The electron gun is characterized in that a cathode-structure supporting member is welded to power-feeding members that ar... | 12/07/2004 |
| 6731073 | Safety starter for fluorescent lamps A fluorescent lamp starter circuit that incorporates the series arrangement of a glow-switch and a semiconductor switch. The semiconductor switch is coupled to a solid state timer. The solid state timer renders the semiconductor switch non-conductive after it has ti... | 05/04/2004 |
| 6707264 | Sequential burst mode activation circuit A sequential burst mode regulation system to deliver power to a plurality of loads. In the exemplary embodiments, the system of the present invention generates a plurality of phased pulse width modulated signals from a single pulse width modulated signal, where each... | 03/16/2004 |
| 6472876 | Sensing and balancing currents in a ballast dimming circuit The present invention is directed to accurately sensing and regulating lamp current, and thus lamp output, over a range of lamp outputs, down to and below 10% of total lamp output. Exemplary embodiments can be used with a single set of power elements to d... | 10/29/2002 |
| 6359387 | Gas-discharge lamp type recognition based on built-in lamp electrical properties A gas discharge lamp has an impedance element such as a capacitor connected to at least one electrode heater, to produce a heater impedance which falls within a range which is unique to lamps of that lamp type. An electronic ballast for operating such lam... | 03/19/2002 |
| 6316888 | Ballast for at least one gas discharge lamp and method for operating such a ballast A ballast for a gas discharge lamp having an inverter. A DC voltage source feeds the ballast. A bridge circuit is arranged in parallel with the DC voltage source. The bridge circuit has first and second controllable switches. The midpoint of the bridge is... | 11/13/2001 |
| 6008586 | Direct current ballastless modulation of gas discharge lamps The present invention relates to an apparatus and method for receiving a modulating signal, splitting up its various frequency components into separate channels using a plurality of filters, and applying the outputs of the filters to gas discharge lamp mo... | 12/28/1999 |
| 5786903 | Multi-power control system for scanners The present invention discloses a multi-power control system for scanners. The method of the present invention has a mode of warm up time, which is controlled by a software that is embeded in a computer. Users can choose a mode of warm up time to control ... | 07/28/1998 |
| 5627434 | Apparatus for operating a fluorescent lamp of an image forming apparatus An apparatus for operating a fluorescent lamp having first and second power source circuits, the second power source circuit including a high frequency transformer having two or more outputs for supplying pre-heating electric currents to filaments, the se... | 05/06/1997 |
| 5448136 | Method and apparatus for current regulation in a gas discharge lamp A regulated and constrained current source is used to drive the cathodes of a hot cathode gas discharge lamp to provide heating during lamp operation. In one embodiment, the regulated current source is time shared between the lamp cathodes and the lamp ar... | 09/05/1995 |
| 5436527 | Circuit for operating a fluorescent lamp In a circuit for operating a fluorescent lamp with controllable luminance, with the fluorescent lamp comprising a discharge path and heater coils, the discharge path is connected through a transformer to a controllable alternating current source. The curr... | 07/25/1995 |
| 5432406 | Wide range load current regulation in saturable reactor ballast A simple and compact magnetic ballast for powering a wide range of fluorescent lamp load Wattage such as 14 Watt to 60 Watt without need for modification to the ballast unit. Arc current to the lamp load is supplied through a saturable reactor including a... | 07/11/1995 |
| 5319281 | Fluorescent tube heating and starting circuit A circuit, having a split primary transformer, for controlling the warm-up, ignition and normal operating stages of a fluorescent tube initially applies in phase voltages to opposite sides of the split primary transformer during a warm-up stage; during an... | 06/07/1994 |
| 5298836 | Power supply circuit for gas discharge lamps operating at a resonant frequency A power supply circuit for any kind of loads or power consuming devices which are connected to an electrical power supply; especially lamps, such as at least one glow or gas discharge lamp, wherein a pulse width modulator controls electronic switches of a... | 03/29/1994 |
| 5243258 | Fluorescent lamp electrode disconnect arrangement A fluorescent lamp system including a ballast with primary and secondary windings and a switch for each of the plurality of electrodes of the lamp system. Each switch is operable in response to the voltage across its associated lamp after its associated l... | 09/07/1993 |
| 5208511 | Fluorescent lamp electrode disconnect arrangement A fluorescent lamp system including a ballast with primary and secondary windings and a switch for each electrode of the lamp system. Each switch is operable in response to the voltage across its associated lamp after its associated lamp turns on to inter... | 05/04/1993 |
| 5175470 | Fluorescent lamp electrode disconnect arrangement A fluorescent lamp system including a switch for each electrode of the lamp system wherein each switch is operable in response to the voltage across its associated lamp after its associated lamp turns on to interrupt the connection of an associated electr... | 12/29/1992 |
| 5057745 | Low-pressure discharge lamp driving circuit A driving circuit for a low-pressure discharge lamp, particularly a compact fluorescent lamp, features a heating transformer with two separate secondary windings, which are respectively permanently connected to the lamp electrodes, and furnish them with p... | 10/15/1991 |
| 5027034 | Alternating cathode florescent lamp dimmer An apparatus for use in dimming florescent lamps by alternating cathodes operated with pulsating unidirectional arc currents for a duration that is long relative to the filament thermal time constant, but short in relation to the mercury migration time co... | 06/25/1991 |
| 4947086 | System for lighting fluorescent lamps A system for lighting fluorescent lamps, includes a plurality of fluorescent lamps, a transformer for generating filament voltage and a starting voltage for the fluorescent lamps, a switching circuit for sequentially and periodically opening and closing a... | 08/07/1990 |
| 4937497 | On-vehicle brake lamp apparatus A brake lamp apparatus causes a neon discharge lamp to light up instantly even when the vehicle key is not inserted into the key hole of the vehicle e.g., when the vehicle is being parked. A neon discharge lamp utilized in the apparatus is pre-heated but ... | 06/26/1990 |
| 4920299 | Push-pull fluorescent dimming circuit A diming circuit for a hot cathode fluorescent lamp is operated in a push-pull mode whereby the hot filaments are alternately the cathode and the anode. Both filaments thus experience similar degradation with time at all brightness levels, thereby enhanci... | 04/24/1990 |
| 4912371 | Power saving fluorescent lamp substitute An improved non-lighting fluorescent lamp substitute to replace one lamp in a two-lamp series connected circuit so that the circuit is completed through the remaining lamp allowing it to light, whereas without the lamp substitute, the circuit is incomplet... | 03/27/1990 |
| 4734616 | Fluoresent lamp with double cathode and probe A dual cathode structure for a fluorescent lamp comprises a pair of electron emissive cathodes which are connected with a common junction and mounted to have an included angle therebetween. The first of the pair of cathodes has first and second leads coup... | 03/29/1988 |
| 4695768 | Bimetal switch for electrode heat cutout within an electrically insulating support A fluorescent lamp electrode heat cutout switch is provided for placement within a fluorescent lamp stem and outside the discharge envelope and is configured such that a resistive heater wire is connected to one electrode lead-in and a bimetallic switch e... | 09/22/1987 |
| 4675573 | Method and apparatus for quickly heating a vacuum tube cathode Disclosed are a method and apparatus for rapidly heating a thermionic vacuum tube cathode, thereby enabling the vacuum tube to be placed in useful operation shortly after the tube is switched on. Rapid heating of the cathode is achieved by passing current... | 06/23/1987 |
| 4663566 | Fluorescent tube ignitor The preferred embodiment provides such a fluorescent tube ignitor having a plurality of auxiliary electrodes provided in the periphery of the tube wall of each fluorescent tube, while the potentials of these auxiliary electrodes are set at a specific leve... | 05/05/1987 |
| 4651058 | Apparatus and method of operation for an electron beam source Apparatus and method for substantially equalizing the potential drop along a line cathode used in an electron beam source adapted for use in a flat display device. The apparatus and method ensure that electrons from a power source are fed through both end... | 03/17/1987 |
| 4473777 | Electron emitter assembly Disclosed herein is an electron emitter assembly for an electron gun which includes a first emitter ring, a second emitter ring, a power supply, connectors for connecting the power supply to the two electron emitter rings so that heating current flows fro... | 09/25/1984 |
| 4454453 | Power source device for ion sources The invention provides a power source device for an ion source, including first to third power source units coupled to the anode, the cathode and the beam extraction electrode of the ion source. The second power source unit applies an alternating voltage ... | 06/12/1984 |
| 4414492 | Electronic ballast system An electronic ballast system includes a first capacitor (C2) electrically coupled to the first filament (30) of a gas discharge tube (12) and becomes the power supply of the gas discharge tube (12) subsequent to both its charging and dischargin... | 11/08/1983 |
| 4329622 | Low pressure gas discharge lamp with increased end illumination A low pressure gas discharge lamp is provided with a pair of high power incandescent electrodes to increase output illumination at the lamp ends. In an alternate construction, the electrodes are of high power, low emissivity and are electrically connected... | 05/11/1982 |
| 4277726 | Solid-state ballast for rapid-start type fluorescent lamps A novel transistorized fluorescent lamp ballast and lamp combination operates from AC line voltage. The ballast provides for "soft-start" lamp operation in one featured aspect and provides for some lamp light output regulation in another featured aspect t... | 07/07/1981 |
| 4237403 | Power supply for fluorescent lamp Electrical power is converted into rectangular waves, which are loosely coupled to a fluorescent lamp. A parallel tank circuit resonant near the fundamental or a harmonic of the square wave frequency is connected between the electrodes of the lamp. The el... | 12/02/1980 |
| 4215292 | Apparatus for operating a gaseous discharge lamp An apparatus for operating a gaseous discharge lamp comprises a D.C. power source, a transistor inverter which is connected to the D.C. power source through a switch, provided with at least one inverter transistor and generates an output having a prescrib... | 07/29/1980 |
