Matches 101 - 150 out of 173 < 1 2 3 4 >
Match Document Document Title
4894586 Crossed-field amplifier bias circuit and method for improved starting  
The present invention discloses a cross-field amplifier having an anode and cathode with a pair of permanent magnets which create a magnetic field perpendicular to an electric field created between...
4876484 Remote video interconnect and method  
A cathode drive circuit couples a video drive signal from a cathode output amplifier to the cathode of a cathode ray tube along a first matched transmission line. Any signal energy not absorbed by...
4816720 Discharge lamp operating circuit  
A discharge lamp operating circuit includes at least a discharge lamp, a condenser and four switches. The condenser is charged and discharged through the discharge lamp by the turn-on and turn-off...
4777406 High voltage power supply particularly adapted for a TWT  
A power supply for helix and collector electrodes of a traveling wave tube is driven by an AC power source having a frequency of at least 500 KHz. The helix supply includes plural, stacked voltage...
4766390 CRT filament supply for multiple frequency video apparatus  
A video apparatus capable of operating at different line deflection frequencies incorporates a CRT electron gun assembly heater supply voltage circuit that maintains a constant rms voltage level...
4742276 Regulated deuterium arc supply system  
An improved power supply system of smaller size and lower cost than prior art supplies is described for starting and maintaining the running of a deuterium arc lamp at a constant current level; by...
4727292 High voltage power supply fault isolation system  
An electronics circuit for improving the fault isolation of failures between an electron tube radio frequency (RF) amplifier and its high voltage power supply is disclosed. High voltage power...
4724363 Current control circuit for high voltage applications  
A current control circuit for high voltage applications includes series-connected high and low voltage sources through which the current to be regulated flows. The low voltage source is a capacitor...
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....
4661745 Rapid-start fluorescent lamp power reducer  
A rapid-start fluorescent lamp system includes a ballast circuit, rapid-start fluorescent lamps and power reducing means for controlling the application of energy to the lamps. The power-reducing...
4638215 Circuit assembly for temperature-dependent cathode current tracking in traveling-wave tubes  
A circuit assembly for temperature-dependent cathode current tracking in traveling-wave tubes having control electrodes and cathodes with a predetermined cathode current, in combination with a...
4613792 Symmetrical load power reduction device for lighting fixtures  
A device to reduce power consumption in a rapid-start fluorescent lighting fixture having one or more lamps and a conventional ballast. The device includes a step-up isolation transformer, a...
4481476 Picture display device comprising a picture display tube and a circuit for feeding the heater thereof  
A picture display device including a picture display tube and a circuit for supplying the heater thereof with an increased heater voltage during a predetermined warming up period. The heater is...
4445074 Starting circuits for discharge lamps  
A starting circuit for discharge lamps includes a current limit device, a full wave rectifier circuit and a Cockcraft-Walton's circuit which are connected between a d.c. discharge lamp having a...
4401919 Indirectly heated Wehnelt cathode  
To achieve an optimum reduction of the warmup time of a Wehnelt cathode, by maintaining a good efficiency, it is proposed to use as a cathode a triode system arranged within the usual cathode...
4396865 Therminoic fault current limiter and method of current limiting  
A thermionic fault current limiter utilizes either a vacuum or plasma environment for a plurality of spaced conduction electrodes. The electrode can be supported by insulative spacers with the...
4358683 Installation for determining the temperature of the heater coil of an x-ray tube  
In the exemplary embodiment the temperature-dependent resistance of the cathode coil is taken as the measure of the instantaneous coil temperature and is employed for the purpose of dimensioning an...
4164685 Magnetron device  
A magnetron device emits through the filament terminals electromagnetic waves of a broad frequency band which act as noises to other electronic devices. The magnetron device comprises a filament or...
4009412 Fluorescent lamp ballast circuit with magnetic switch  
A rapid start fluorescent lamp ballast with a secondary winding supplying lamp current and tertiary windings for supplying heater current, has a magnetic switch which senses current through the...
4004184 Apparatus for operating gaseous discharge lamps on direct current from a source of alternating current  
A system providing flickerless operation of a gaseous discharge lamp utilizes a DC voltage applied across the lamp electrodes. Low starting voltage and power consumption are obtained by applying an...
4002901 Photodetector non-responsive to Cerenkov radiation  
A photodetector comprises an evacuated envelope with a transparent face plate. The face plate is selected from a material which causes total internal reflection of photons produced by Cerenkov...
3996493 Fluorescent lamp unit having ballast resistor  
An integral self-contained fluorescent lamp unit comprising an elongated lamp and an elongated ballast resistor carried in an outwardly extending housing member positioned alongside the lamp.
3986065 Insulating nitride compounds as electron emitters  
A high emission of electrons, as a result of negative electron affinity, has been achieved from an insulating nitride coated with a film of an electropositive work function reducing material.
3982153 Rapid warm-up heater circuit  
An improvement for effecting rapid warm-up of the thermionic cathode means in a color CRT display device utilizing a degaussing circuit including a temperature responsive resistive element in...
3974418 Fluorescent lamp unit with ballast resistor and cooling means therefor  
An integral self-contained fluorescent lamp unit comprising an elongated lamp and an elongated ballast resistor adjacent to and alongside the lamp. Metal strip heat radiators are positioned...
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...
3927348 Control circuits for auxiliary light source for use with high intensity discharge lamps  
The present invention relates to control circuits for auxiliary lamps which provide supplemental lighting during the start-up and cool-down phases of operation of associated high intensity...
3921030 Radiation standard  
Low pressure mercury vapor lamps utilizing a relatively high current of approximately 0.5-1.5 A/cm 2 provide within carefully controlled operating parameters a highly reliable radiation standard...
3921031 Electroemissive component  
An electroemissive component having variable emissivity is made up of a conductive substrate on which at least one continuous thin film of a solid organometallic compound has been formed by...
3911320 Multiple lighting level ballast for fluorescent lamps  
A ballast for starting and operating rapid-start fluorescent lamps includes a switch coupled to the running capacitor means in the ballast circuit. The switch can be selectively operated to a...
3895254 Charged particle accelerator with integral transformer and shielding means  
A charged particle accelerator wherein a receptacle surrounding an accelerating tube is made of an insulator, a grounded conductor layer is provided on the outside surface of the receptacle, at...
3887835 Field emission electron gun  
A field-emission electron gun wherein, during the state under which an electric field is formed between the cathode and the first anode to thus emit electrons, a heating current is supplied to a...
3886401 Apparatus for accelerating cathode heating  
Apparatus for accelerating the heating of the cathode heater of a cathode ray tube or the like. A first self-heating positive temperature coefficient resistor is interconnected to an electrical...
3868541 FILAMENT-CURRENT CONTROL UNIT IN ELECTRON-BEAM APPARATUS  
An electron-beam apparatus is provided with an electrode for intercepting a portion of the electron beam so as to achieve automatio cathode temperature control. The filament current is controlled...
3848153 ELONGATED ELECTRON-EMISSION CATHODE ASSEMBLY AND METHOD  
This disclosure relates to generating an elongated electron beam curtain with the aid of an elongated tubular cathode structure transversely supported against sagging and distortion from a...
3836816 ARRANGEMENT FOR IGNITING AND SUPPLYING A GAS-AND/OR VAPOUR DISCHARGE LAMP  
A supply circuit for a discharge lamp includes a glow starter tube and a photosensitive resistor in parallel across the preheated electrodes of the discharge lamp. The photo-resistor is exposed to...
3819982 LOW NOISE DIMMER FOR FLUORESCENT LAMPS  
A phase control circuit for fluorescent lamps having low radio frequency noise signal generation characteristics which comprises a pair of control circuit terminals for connection into one power...
3795837 ELECTRON GUNS  
In an electron gun for use in electron beam instruments such as electron microscopes and microanalysers the contamination that builds up on the control electrode (grid) is removed periodically and...
3778677 INVERTER BALLAST CIRCUIT  
This invention describes a circuit for providing high voltage A.C. potential for the initiation of discharge, and for powering a fluorescent lamp, from a low voltage battery. A principal...
3767967 INSTANT-ON CIRCUITRY FOR AC/DC TELEVISION RECEIVERS  
A single pole switching arrangement maintains the filament of the cathode-ray kinescope of a television receiver at full power when the set is turned to an "ON" condition and connected to an...
3760224 DISCHARGE LAMP IGNITING CIRCUIT  
A discharge lamp igniting circuit in a discharge lamp of short tube length and capable of being ignited only by pre-heating a filament thereof, comprising a stabilizer winding having a secondary...
3714492 DC FLUORESCENT LAMP WITH IMPROVED EFFICIENCY  
A DC fluorescent lamp unit in which resistance wire is wound about the tubular lamp envelope for providing a temperature gradient along the length of the lamp which is operative to shift higher the...
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...
3619717 ELECTRON BEAM CURRENT REGULATOR FOR A LIGHT VALVE  
Electron beam current in a light valve is maintained at a uniform value by feedback apparatus which senses current at the medium upon which a raster is generated by the beam and controls the rate...
3619712 FILAMENT-PROTECTING DEVICE AND SHOCK RESISTANT LAMP  
Incandescent lamps connected in circuits to keep a maintenance current flowing through the lamp filament when the lamp is off to improve the ductile-brittle properties of the filament. Lamps are...
3611077 THIN FILM ROOM-TEMPERATURE ELECTRON EMITTER  
A vacuum enclosure containing an anode and a cathode, wherein a first embment of the cathode comprises a continuous thin film of semiconductive material deposited on an electrically insulating...
3534223 CATHODE RAY TUBE SYSTEM  
3530349 NOISE SUPPRESSION  
3529207 FLUORESCENT LAMP CONTROL  
3527947 DENTAL X-RAY TUBE STABILIZER HAVING A CONTROL SWITCH IN THE FILAMENT CIRCUIT  
Matches 101 - 150 out of 173 < 1 2 3 4 >