Matches 101 - 150 out of 210 < 1 2 3 4 5 >
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4620078 Power control circuit for magnetron  
A duty cycle power control circuit for a magnetron including a power transformer having a primary winding, a secondary anode winding for supplying anode voltage to the magnetron and a secondary...
4616156 Tri-model type circuit breaker and rapid-start fluorescent lamp  
A rapid-start fluorescent lamp includes a circuit breaker having a pair of electrical conductors sealed into a bulb and connecting a lamp lead to the electrode of the lamp. The circuit breaker...
4603281 Electronic fluorescent lamp starter  
A Varistor (which is a non-linear impedance means) is connected in series with the primary winding of a current-transformer; and this series-combination is connected across the fluorescent lamp to...
4600860 Rapid-start fluorescent lamp closure switch  
A rapid-start fluorescent lamp has a thermally-sensitive circuit breaker disposed thereon for disconnecting the electrodes of the lamp from an energizing source at a given range of bulb...
4600861 Fluorescent lamp circuit breaker  
A rapid-start fluorescent lamp includes a pair of spaced electrodes within an envelope with one electrical lead connected to an electrode and the other lead coupled to the electrode by a...
4588924 High efficiency converter for discharge lamps  
An energization arrangement for a discharge lamp includes a DC/AC converter to which a discharge lamp (81) is connected. The lamp is shunted by a relay contact (90) to obtain an electric circuit...
4588925 Starting circuit for low-pressure discharge lamp, such as a compact fluorescent lamp  
To provide for reliable starting of compact-type fluorescent lamps, or ot discharge lamps difficult to start, a voltage divider which is formed only by serially connected capacitors (C1, C2) is...
4572986 Circuit breaker with thin-walled bulb  
A rapid-start fluorescent lamp includes a pair of spaced electrodes within an envelope having a fill gas and a phosphor-covered inner wall surface with a circuit breaker having a glass bulb with a...
4525652 Auxiliary-voltage source for supplying electric circuits which are at a high potential  
In an auxiliary-voltage DC source for supplying an electric circuit and, more particularly, one at a high potential in an electron gun without an isolation transformer, the primary winding of a...
4523795 Discharge lamp operating apparatus and method  
A process for operating a discharge lamp with an arc drop of not less than about 75% of a given service voltage includes the steps of series connecting a ballast and discharge lamp, coupling the...
4520495 Failure detection circuit for an X-ray tube  
A failure detection circuit for a center metal grounded type X-ray tube. If the high voltage applying line for the anode side is kept opened and simultaneously for the cathode side is closed, the...
4488089 Fluorescent indicator tube driving circuit  
A plurality of heater elements are heated using a DC voltage to render the display brightness of a fluorescent indicator tube uniform. A circuit comprises a first circuit for intermittently...
4481447 Power supply for a magnetron  
A method of controlling the power output of a magnetron tube, and an electric power supply for supplying power to the tube. According to the method, power is continuously supplied to the magnetron...
4451767 Temperature sensitive ballast circuit for a fluorescent lamp  
A ballast circuit for a fluorescent lamp including a gaseous discharge light bulb which for a given input power produces a decreasing amount of light as the bulb temperature decreases below 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...
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...
4346297 X-ray photographic apparatus  
The disclosure relates to an X-ray photographic apparatus which can prevent the overshoot of the tube current, which is apt to generate at the start of X-ray radiation. The apparatus comprises an...
4315195 High-voltage supply for power electron-beam guns  
A high-voltage power supply for an electron-beam gun with a heatable cathode and an anode and of the type having an electronic switch connected in the current circuit for the cathode and...
4314182 System for controlling the power of a high-voltage electron beam generator  
A system for the control of power of a high-voltage electron beam generator having a cathode and a control electrode for the cathode, has a controller at ground potential, a pulse generator for the...
4296356 Ionization vacuum gauge circuit  
In a circuit for an ionization vacuum gauge having a thermionic filament, a control circuit receptive of a control current for controlling the filament and a switch for applying the control current...
4274035 Field emission electron gun  
A field emission electron gun including a cathode, a control electrode which is disposed in the vicinity of the cathode, an anode which is disposed for accelerating electrons emitted from the...
4267487 Regulated filament supply for high-power tubes  
A high power tube in applications requiring reduced AC hum in the amplified signal, utilizes a direct current heated filament. In order to reduce the incidence of tube failure and maintain a stable...
4253048 Filament heating apparatus  
A filament heating apparatus for an X-ray tube having an isolation transformer through which a control signal is digitally transmitted regulates the filament current to be constantly stable. The...
4247801 Cathode current control system  
A cathode current control system comprising an electron discharge device having a tubular envelope wherein an electron gun is disposed to beam a cathode current of electrons onto a spaced anode...
4241278 Indicator device with vacuum fluorescence elements  
A indicator device with vacuum fluorescence elements controlled or triggered by a driving circuit, the heaters of the elements lying in a heating circuit. The heating circuit contains a switch...
4234823 Ballast circuit for low pressure gas discharge lamp  
An improved ballast circuit for a low pressure gas discharge lamp having two filament type electrodes at opposite ends of the lamp is disclosed. The ballast circuit includes a first device for...
4158794 Drive means and method for vacuum fluorescent display systems  
A vacuum fluorescent display system for displaying a plurality of illuminable characters includes a plurality of segmented anodes, at least one cathode filament, a plurality of control grids...
4158793 Gas discharge lamp control circuit  
An energizing circuit for gas discharge lamps for room or street lighting or for lights used in document copying machines and the like comprises means for continuously energizing the same at a low...
4156831 Fluorescent lamp having heater circuit disconnect device  
A rapid start fluorescent lamp contains a circuit opening device on the cathode mount which opens a short time after lamp starting and stops heater current flow to the cathode. The circuit opening...
4149110 Brightness controlled CRT  
A cathode ray tube control system comprising a cathode ray type tube having a tubular envelope wherein an electron gun is disposed to direct an electron beam onto a spaced anode target screen, the...
4137484 Color improvement of high pressure sodium vapor lamps by pulsed operation  
High pressure sodium vapor lamps containing sodium or both sodium and mercury are raised in color temperature and improved in color rendition by pulse operation. During the pulse there is...
4128789 Method of operating gaseous discharge lamps  
Gaseous discharge lamps of high pressure sodium vapor type having an arc tube containing a mixture of sodium vapor and another metal vapor are operated with unidirectional current (DC) pulses in a...
4112336 Lamp-starting device  
A lamp-starting device for use in a lamp socket adapted to receive the base of a lamp, the device having a pair of electrically-conductive plates disposed in spaced relation in and electrically...
4097779 Fluorescent lamp containing a cathode heater circuit disconnect device  
A rapid start fluorescent lamp contains a circuit opening device on the cathode mount which opens a short time after lamp starting and stops heater current flow to the cathode.
4090106 Field emision electron gun with controlled power supply  
A field emission electron gun according to this invention comprises a cathode for emitting electrons, an anode, a high voltage source which applies a high voltage between the cathode and the anode...
4059783 Field emission apparatus  
An electron producing apparatus of the field emission type wherein instantaneous values of an emitted current are sequentially measured to store a relative minimum value of the emitted current...
4058752 Dosimetry control method  
In a method of operating a photochemotherapy chamber for the irradiation of a patient with long wave ultraviolet light, a prescribed dosage is first selected. The prescribed dosage is then...
4054831 Power supply turn-on and turn-off transient elimination circuits  
Power supply turn-on and turn-off transients are eliminated in power supplies employing thermionic vacuum tube pass devices and control amplifiers for controlling the output voltage of the power...
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...
4045707 System for the power control of high voltage electron beam generators  
System for the power control of high voltage electron beam generators having a cathode and a control electrode associated with the cathode. The system is provided with a high voltage isolation...
T961002 Electron current regulator for an electron discharge device  
circuit for controlling the electron discharge from a cathode, of an electron discharge device, which provides a control voltage signal, proportional to the cathode current, for comparison with a...
4039893 Discharge lamp having disconnect effective upon jacket failure  
The inner arc tube of some jacketed discharge lamps transmits ultraviolet radiation which is normally intercepted by the glass outer envelope. To prevent harmful release of such radiation in the...
4032816 Safety switch which renders hid lamp inoperative on accidental breakage of outer envelope  
HID lamp has a spring-loaded safety switch positioned between the outer protective envelope and the arc tube and electrically connected in series with one of the lamp electrodes. When the lamp is...
3984726 Ultraviolet light system having means for maintaining constant intensity light profile  
Ultraviolet light processors containing a plurality of ultraviolet light sources are improved by providing means for increasing the intensity of one lamp to compensate for a reduction in intensity...
3938001 Protection circuit for electron gun  
An electron gun comprising a changeover chamber and changeover circuit between the gun chamber and the insulated cable which connects the power supply circuits to the electrodes which enables...
3936756 Field emission electron gun having automatic current control  
An improved field emission type electron gun is automatically controlled so as to generate a stable emission current. The preferred embodiment employs a detecting means for detecting the emission...
3912967 Heater temperature-regulating circuit for sensor of halogen leak detector  
A circuit for energizing and regulating the temperature of a heater-anode of a gas sensor. The heater-anode is connected in one arm of a bridge circuit. A d-c voltage source is connected across one...
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...
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...
3885194 Temperature control for an indirectly heated cathode for a high power electron beam gun  
A method and apparatus for regulating and determining the temperature of a heated cathode in an electron beam system to regulate the magnitude of the beam current both during operation and prior to...
Matches 101 - 150 out of 210 < 1 2 3 4 5 >