Matches 51 - 100 out of 173 < 1 2 3 4 >
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5920153 Power supply for light sources, particularly for the quick ignition of fluorescent lamps and the like  
A power supply for light sources, particularly for fluorescent lamps and the like, comprising capacitive means (1) that are connected to the mains (9) and are adapted to supply rectifier means (2)...
5909085 Hybrid luminosity control system for a fluorescent lamp  
A luminosity control system (10) for a fluorescent lamp (12) that has a glass enclosure (18) and a pair of lead wires (14) at each end of the glass enclosure is provided. A filament (16) is...
5859504 Lamp ballast circuit with cathode preheat function  
A ballast circuit for a gas discharge lamp contained within a resonant load circuit has resistively heated cathodes. A d.c.-to-a.c. converter circuit supplyies a.c. current to the resonant load...
5859507 Circuit arrangement for starting and operating a high-pressure gas discharge lamp operating by controlled alternating current  
A direct voltage source (1) delivers a voltage (U B ) at its output terminals, which is then converted by a direct voltage/direct voltage converter (2) to a higher value. This higher voltage value...
5744911 Device for driving directly heated cathode of cathode ray tube  
A device for driving a directly heated cathode of a cathode ray tube eliminating a delay due to inductance of a transformer. A transformer that produces the heater-heating signal voltage applied to...
5721470 Microwave generator apparatus comprising controller for automatically adjusting filament power of a magnetron  
In a microwave generator apparatus including a magnetron having a filament and an anode and generating a microwave, a filament power source supplies a filament power to the filament of the...
5714848 Variable color discharge lamp  
A circuit arrangement for alternatingly, at a frequency f, establishing and extinguishing a discharge in each of a plurality of discharge paths, each of which is associated with a first electrode...
5703441 Multi-function filament-heater power supply for an electronic ballast for long-life dimmerable lamps  
A filament-heater power supply includes a combination forward and flyback power converter for supplying electronically variable, isolated voltages to dimmable discharge lamp filaments while...
5675220 Power supply for vehicular neon light  
A circuit for use in providing high voltage power to a neon bulb positioned on the vehicle utilizing the vehicle DC battery as the power source. The circuit includes an invertor, a transformer, and...
5659227 Fluorescent lamp controller and original-document exposing apparatus a having the fluorescent lamp contoller  
A fluorescent lamp controller for an original-document exposing apparatus includes a detection circuit for detecting the quantity of light emitted by a fluorescent lamp, an actuator for applying...
5656891 Gas discharge lamp ballast with heating control circuit and method of operating same  
There is provided a ballast for at least one gas discharge lamp having an inverter which has two switches (S1, S2) in series, connected to a d.c. voltage source and switched with complementary...
5646487 Lighting device for gas discharge tube with insulated discharge shielding member  
The present invention is to provide a gas discharge tube which is properly lighted to improve the reproducibility of a satisfactory light emission state. The gas discharge tube includes an envelop...
5642016 Drive circuit for a solar lamp with automatic electrical control of the lamp operating conditions  
A solar lamp drive circuit is arranged to delay start-up while a current is supplied to the lamp filament to warm up the filament. During operation, the back e.m.f. induced in the lamp is sampled,...
5633563 Gas discharge tube with discharge shielding member  
A gas discharge tube includes a light-emitting section in an envelope sealing a gas therein, positioned at distal ends of lead pins while spaced from an inner side wall of the envelope. The...
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...
5608292 Single transistor ballast with filament preheating  
A ballast circuit for driving a gas discharge having a source of pulsating and rectified AC (20), an energy storage circuit (30), a switch (40) that can have one end connected to an energy storage...
5604408 Control device for a fluorescent tube, having synchronized blocking of auxiliary and primary transistors  
In a device to control a fluorescent tube supplied from a DC source by an accumulating converter, a rectifying bridge 17 is mounted opposite to the secondary 13, between the preheating electrodes...
5583395 Fluorescent device having a fluorescent starter which precisely controls heating time and absolute synchronism of fire point  
A new fluorescent device including an electronic fluorescent starter, a phase leading capacitor, a ballast, a bridge rectifier, a fluorescent lamp, a brightness compensation circuit, and a control...
5550433 Driver circuit for discharge lamps  
Driver circuit for discharge lamps. The driver circuit contains an inverter driving a lamp circuit with a discharge lamp and the current in the lamp circuit is measured as a voltage U ILC over a...
5548187 Method of flicker-free lighting hot-cathode low-pressure rare gas discharge lamp  
The present invention provides a method of lighting a hot-cathode type low-pressure rare gas discharge lamp without flicker. The method has the steps of operating, as a hot cathode, at least one of...
5530319 Power supply circuit for a discharge lamp and use of and method of operating the same  
For triggering a discharge lamp powered by a d.c. source and having electrodes disposed in the lamp bulb, a power supply circuit is proposed having a triggering device where, after the start of...
5504399 Electrical circuit for operating a fluorescent lamp and for measuring the lamp current  
In an electrical circuit for feeding a fluorescent lamp, a serial resonant circuit is comprised of a first coil of a feedback-transformer, a resonant inductor, a coupling condenser, a first lamp...
5493336 Picture tube screen device having waiting state function  
For preserving and, thus, for extending the useful life of a picture tube of a picture tube screen device having a waiting state function. The filament current of the picture tube in the waiting...
5479075 Fluorescent lamp starter circuit  
A fluorescent lamp starter circuit includes a relay which forms a first circuit loop to detect the input voltage and to switch the relay from the normally-closed position to the normally-open...
5444333 Electronic ballast circuit for a fluorescent light  
An energy efficient and cost effective electronic ballast circuit which lights a fluorescent tube but which avoids excessive voltages or pulsing of the tube. The starter circuit preheats the...
5440205 Fluorescent lamp starter having a transistor base control means  
A fluorescent lamp starter which includes: a series circuit to be connected to a power source for supplying an AC voltage, including a ballast and a fluorescent lamp equipped with electrodes; a...
5440204 Gas discharge lamp lighting system with phase synchronized gating of d.c. electrode voltage  
The present invention relates to a gas discharge lamp lighting system in which a voltage source is provided for supplying an a.c. voltage across the lamp electrodes and, further, a source of stored...
5438238 Multiple filament enhanced ion source  
An improved ion source is provided with multiple filaments and wiring for selectively connecting various combinations of filaments to a current source. In one embodiment an additional filament is a...
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...
5424611 Method for pre-heating a gas-discharge lamp  
Two methods are disclosed for providing a warm-up or pre-heat period for a gas-discharge lighting system, such as a fluorescent light. One method provides current to the lamp for a predetermined...
5389857 Magnetic ballast for fluorescent lamps  
A low component count and lightweight ballast usable with fluorescent lamp loads of widely different wattage has first and second inductors and first and second capacitors connected in a bridge...
5365146 Control device having an oscillator unit that pulses a direct current through the filaments of the vacuum fluorescent display unit thereof and methods of making the same  
A control device and methods of making and operating the same are provided, the control device comprising a microcomputer unit, a vacuum fluorescent display unit having a filament unit, a power...
5347197 Display device having a display tube including a cold cathode and a current mirror drive circuit for the cold cathode  
A display device having a display tube including a cold cathode, for example a PN emitter (PNE), has the terminals of the PN emitter (PNE) coupled between first terminals of a first (CR1) and a...
5338110 Circuit, having multiple series resonant paths, for lighting a blinking fluorescent lamp without adversely affecting lamp life  
A circuit for lighting a fluorescent lamp. The present invention takes into account the fastidious characteristics of the fluorescent lamp, and during the momentary lighting of the fluorescent...
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...
5281897 Method for operation of a cathode using the tunnelling effect and a cathode configuration for execution of the method  
A cathode that uses the tunneling effect of electrons through a layer of insulation consisting of alpha alumina in combination with a circuit to provide a pulsed current caused by a current...
5177402 Arc suppressor for electron gun  
An arc suppressor is provided for an electron gun of the type used e.g. in semiconductor lithography equipment. The arc suppressor prevents damaging emission properties of the electron gun either...
5144195 Circuit for driving at least one gas discharge lamp  
A driving circuit for one or more gas discharge lamps (102, 104, 106) having heatable filaments (102A&B, 104A&B, 106A&B) includes: a self-oscillating, series-resonant oscillator (196, 198, 178,...
5130606 Method and apparatus for increasing the cathode efficiency in a cathode ray tube  
A CRT display system is described wherein a measure of the beam current generated within the CRT is derived and the voltage across the cathode heater modified as a function of this measure. In this...
5118991 Electron beam generator for an electron gun  
In an electron beam generator where the heating current for the cathode is transformed by an insulating transformer 7 disposed on the high-voltage insulator 4 of the beam head, the primary winding...
5107183 Discharging method and small fluorescent lamp using the discharging method  
A charging method within a glass tube using a direct current of low voltage is provided in order to obtain a small fluorescent lamp with a light emission of high luminance. Two distinct discharges...
5063328 Energy saving circuit for discharge tubes  
Circuits for increasing the efficiency of fluorescent tubes by openings one side of all of the filament circuits of the tubes in response to flow of plasma current. The circuits may be employed in...
5055743 Induction heated cathode  
An improvement for a vacuum tube or a plasma tube comprises a cathode loop formed of a material suitable for induction heating. A support structure mounted inside the vacuum tube supports the...
5055742 Gas discharge lamp dimming system  
A dimming system, which provides a time-varying current from a power source between the electrodes of a gas discharge lamp, simultaneously provides high-frequency, low-level current between the...
5047689 Gas discharge tube, indirectly heated cathode for use therein and drive circuit therefor  
A gas discharge tube comprises an indirectly heated cathode structure including a hot cathode into which a heater is incorporated. During discharging, the heater is supplied with a discharge...
5010275 Electron tube device and electron tube  
An electron tube device comprising an electron tube having a line cathode, and an electric power source for supplying power pulses to the line cathode. The electron tube device comprises...
4987342 Self-ballasted glow discharge lamp having indirectly-heated cathode  
A negative glow discharge lamp including an anode and an indirectly-heated cathode disposed within a phosphor-coated envelope. The cathode includes a heater filament surrounded by a metallic...
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...
4902933 High efficacy discharge lamp having large anodes  
An electric discharge lamp having two distinct electrode pairs, each pair including a "large" anode, is provided to eliminate the voltage drop between the positive column and the electrodes. A...
Matches 51 - 100 out of 173 < 1 2 3 4 >