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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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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,...
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...
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...
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....
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...
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...
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...
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....
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...
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...
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...
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...
4122374 Circuit arrangement for increasing the luminuous flux in fluorescent tube hand lamps  
A circuit for the operation of fluorescent lamps which allows the current through the lamps to be raised above the manufacturer recommended limit without adversely effecting the lamps. Two...
4122375 Circuit arrangement for increasing the luminous flux in fluorescent tube hand lamps  
A circuit for the operation of fluorescent lamps which allows the current through the lamps to be raised above the manufacturer recommended limit without adversely effecting the lamps. Two...
4080549 Plasma reflex discharge device  
A high energy discharge apparatus uses a generally electron transparent thin foil anode of various configuration which is arranged parallel to and spaced apart between a pair of cathodes, and...
4071807 Fluorescent lamp lighting device  
A fluorescent lamp lighting device comprises a d.c. power source, a transistor, a transformer and a fluorescent lamp. The d.c. power source is connected in series with the primary winding of the...
4051407 Arrangement including a gas and/or vapor discharge lamp  
A device for operating a low-pressure sodium vapor discharge lamp without a ballast. The electrode voltage drop near a main electrode of the sodium lamp is influenced by a change in the pre-heating...
4010399 Switching circuit for a fluorescent lamp with heated filaments  
A ballast for a rapid start fluorescent lamp with heated filaments has a secondary winding supplying lamp current, tertiary windings for supplying heater current to the filaments, and solid state...
3971967 Fluorescent lamp installation having separate filament transformers and remotely located ballast  
A fluorescent lamp installation for very high intensity illumination uses standard rapid start filament type lamps with standard ballast remote from the lamp pairs to reduce cooling requirements....
3935502 Ballast circuit for eliminating flicker in gaseous discharge lamps  
A ballast especially useful in forming symmetrical half cycles of lamp current during dim light level operation, and thus in overcomming a type of lamp flicker. The light level of the lamp is...
3919590 Arrangement for igniting a gas and/or vapour discharge lamp provided with preheatable electrodes  
An electronic starter for igniting low-pressure mercury vapour discharge lamps. To prevent local blackening of the lamp after a certain number of switch-on operations, relatively high voltage peaks...
3909663 Arrangement for regulating the operating parameters of an electron beam generator  
An arrangement for regulating the operating parameters of an electron beam generator in which the main cathode is indirectly heated by a directly-heated auxiliary cathode. A regulating circuit...
3781594 LAMP CIRCUITS  
A circuit for operating a fluorescent lamp, particularly in hazardous conditions, comprises two parallel legs including inductive and capacitive reactances, respectively, and a third leg in series...
3771007 HIGH INTENSITY LAMP APPARATUS AND METHOD OF OPERATION THEREOF  
Describes photochemical and fluorescent lamp apparatus including means for providing a far U.V. ionic radiation emitting discharge, the intensity of which varies as a superlinear function of...
3760225 HIGH CURRENT PLASMA SOURCE  
A plasma source in which a plurality of sturdy filaments are distributed around the perimeter of a truncated cylindrical discharge chamber. A small area anode is situated axially at one end of the...
3700956 ARC DISCHARGE LAMP CONTROL CIRCUIT  
A high-frequency, lightweight, solid-state ac ballast for operating arc discharge lamps such as fluorescent lamps. An ac ballast in accordance with the invention includes a single transistor and a...
3631317 SYSTEM FOR LIGHTING A FLUORESCENT LAMP  
A system for instantaneously lighting a fluorescent lamp is disclosed which includes a capacitor, a pulse transformer having primary and secondary windings, and a diode and silicon symmetrical...
3629648 TRANSISTORIZED FLUORESCENT TUBE OPERATING CIRCUIT  
A circuit for operating fluorescent tubes ranging from 8 to 40 watts, the circuit being supplied by either direct or alternating current. The circuit components are arranged so that input current...
Matches 1 - 50 out of 109 1 2 3 >