Abstract: An arc lamp system comprises a power supply coupled to a xenon arc lamp through an interface constructed on a heavy printed circuit board. Such plugs directly into an igniter printed circuit board. In turn, a xenon arc lamp module with heatsinks plugs directly onto banana plugs bolted on the interface printed circuit board. Copper traces buried on inner layers of the interface printed circuit board are very wide and heavy, and kept as short as possible.

Abstract: Disclosed is a conductive antireflection film comprising a laminate structure consisting of a conductive layer and an insulating covering layer covering the surface of the conductive layer and a conductive member connected at one end to the conductive layer and exposed at the other end to the outside. The conductive member is brought into contact with an electrolytic solution so as to control the state of the metal contained in the conductive layer, making it possible to prevent effectively an electromagnetic wave from leaking to the outside and to obtain a clear image of a high contrast.

Abstract: A circuit configuration with reduced EMC radiation in a motor vehicle includes a semiconductor switch with a load section which is connected, on one hand, through a first supply line to a positive battery terminal and, on the other hand, through a second supply line to a load and a freewheeling diode. A device for pulse-width modulation controls the semiconductor switch. The semiconductor switch and the freewheeling diode are disposed as close as possible to the battery terminal, so that supply leads from the battery to the semiconductor switch and the freewheeling diode are shortened.

Abstract: A low-interference lighting system includes a housing, a voltage converter located within the housing, at least one pair of spaced-apart arms serving as electric elongated conductors extending from the housing, and a pair of special contact conductors for an external electrical device to tap into the electric elongated conductors. With respect to each arm, it includes an elongated conductor for carrying electric current and a grounded conducting shield surrounding, but electrically isolated from, the elongated conductor. External electrical devices, such as lamps make electrical contact with the elongated conductor via the contact conductors while insulated from the grounded conducting shield. In one embodiment, the pair of arms are rigid and in another embodiment, they are flexible.

Abstract: There is provided a field leakage preventing coating for a cathode ray tube, including a vacuum envelope having a panel section, a neck section and a funnel section connecting the panel section and the neck section; a fluorescent film applied on an inner face of the panel section; and an electron gun, mounted in the neck section, for emitting three electron beams toward the fluorescent film. The field leakage preventing coating is formed by adhering a double coating film composed of a conductive first layer mainly composed of particles of one or more kinds of metal among noble metal elements of gold (Au), silver (Ag) and platinum (Pt) and a second layer mainly composed of silicon dioxide (SiO2) or magnesium fluoride (MgF2) on an outer face of a faceplate of a panel section of the color cathode ray tube.

Abstract: A cathode ray tube is described having at least one electron gun including a cathode, a control grid, and a focusing unit, and a strip made of electrically conductive material applied to the cathode ray tube in parallel to the outer coating of the tube and connected to ground potential. Means and measures are provided to eliminate harmful effects of high-voltage sparkovers. The cathode ray tube may be is used, for example, in monitors.

Abstract: A panel (10) and a drive circuit substrate (12) are disposed within a conductive shielding case (20). Between the panel (10) and the drive circuit substrate (12), a conductive holding board (16) or separately provided conductive material is provided, and connected to the conductive shielding case (20) by a connecting means (22) so as to surround the drive circuit substrate (12) to be the source of noise. This forms an electromagnetic shield for the drive circuit (12). Further, a conductive layer is formed on an upper part of an insulating film of a wiring board (25) which connects the panel (10) and the drive circuit substrate (12). The conductive layer may be connected to, for example, the conductive shielding case (20) and the holding board (16) to be forced to have a ground potential. This provides an electromagnetic shield to the wiring board (25) as well as preventing emission of noise from a gap between the panel (10) and the conductive shielding case (20).

Abstract: A display unit that enables reduction in number of additional parts, decrease in leakage magnetic field in a VLF band generated from the display unit in all directions at low cost, and suppression of the leakage magnetic field to the specified value or less according to MPR-II Standard with tolerance is provided. The display unit comprises a cathode-ray tube having a neck portion, a deflection yoke 2 that is mounted at a predetermined position on a periphery of the neck portion, and a driving circuit 3 that has a coil 4 and drives the deflection yoke 2. The driving circuit 3 (the coil 4) is provided at such a position and in such a direction that a magnetic field E.sub.2 generated from the driving circuit 3 (the coil 4) cancels out a leakage magnetic field generated E.sub.1 from the deflection yoke 2 substantially at the position in front of and 50 cm away from the center of a face panel of the cathode-ray tube.

Abstract: A lampholder in accordance with the invention can suitably be used for a low-pressure discharge lamp (a) which operates at a high frequency and which comprises an elongated, tubular discharge vessel (b), said lamp being provided with a pair of electrodes (c, c') for maintaining an electric discharge in the discharge vessel. The lampholder (0) has contacts (1, 1') for connecting a high-frequency power supply (4), said contacts being electrically connected to a first (2) and a second terminal (2') for connecting the lamp. The second terminal is further removed from the contacts than the first terminal. A compensation conductor (6) extending between the first (2) and the second terminal (2') is connected to said first terminal (2). This leads to a reduction of conducted interference.

Abstract: In the vehicle-lamp lighting-on device, a body case has a connection opening formed in the front end thereof. A lighting-on transformer is disposed within the body case. The transformer includes a core housing with an iron core and a coil bobbin with a secondary coil wound thereon. The connection opening of the body case is shielded at the front end of the lighting-on transformer. A socket for receiving a vehicle discharge lamp includes a high-voltage terminal and low-voltage terminals. When the socket is inserted into the connection opening of the body case, the high-voltage terminal of the socket is connected to the high-voltage side terminal of the lighting-on transformer, and the low-voltage terminals are connected to the low-voltage side terminals. The connection opening of the body case is shielded by the front surface (made of insulating material) of the lighting-on transformer.

Abstract: An anode ripple voltage waveform is detected by a capacitor built into a flyback transformer. The detected waveform is then phased by a phasing circuit, amplitude adjusted by an amplitude adjusting circuit and subsequently delivered to an addition circuit. A horizontal component is detected by a horizontal output transformer, then phase adjusted by a phasing circuit and subsequently amplitude adjusted by an amplitude adjusting circuit. Thereafter, the horizontal component is added to the anode ripple component by the addition circuit, inverted and amplified by an inverting amplifier, and then supplied to an antenna arranged in proximity to the cathode ray tube. Thus, electric fields radiated from the face of the cathode ray tube are suppressed.

Abstract: A cathode ray tube device has a neck, a funnel, a face panel, an inner conductive film disposed on an inner surface of the funnel, a first outer conductive film disposed on an outer surface of the funnel, and a deflection yoke. The inner conductive film and the first outer conductive film act as a capacitor. A second outer conductive film for electric field shielding is disposed on an outer surface of the funnel. The second conductive film is disposed between the deflection yoke and the first outer conductive film in such a way that the second outer conductive film is separated from the deflection yoke and is not covered by the deflection yoke.

Abstract: Hook- and loop-type tapes are selectively attached to a video display unit and to flexible elongated strips of magnetic material so that the strips of magnetic material may be removably mounted around the video display unit in orthogonally intersecting planes to absorb magnetic radiation from the source. Each strip of magnetic material has a grain orientation parallel to its longitudinal axis and may be formed from grain-oriented ferromagnetic material in the range from M3 to M7. A multiple-layer magnetic shielding material is provided by securing first and second layers of such grain-oriented ferromagnetic material together with the grain orientation of the first layer orthogonal to the grain orientation of the second layer. Each strip of magnetic material may also be formed from this multiple-layer magnetic shielding material.

Abstract: A degaussing circuit is formed as a series connection of a PTC element and a degaussing coil operated such that the operating frequency of the current therethrough is higher than the frequency of the power source line for the device such as a color television set in which this degaussing circuit is incorporated. This frequency conversion may be effected by a circuit which also functions to convert the alternating current from the power source line into a direct current. The degaussing circuit may further include a relay circuit for switching on and off the current through the PTC element and the degaussing coil.

Abstract: Electromagnetic interference ("EMI") is reduced in a CRT video display system by spreading-out the EMI-producing spectra present in the video pixel data and/or clock signals. A clock dropping circuit coupled between the display generator main oscillator and the timing generator periodically phase-modulates the timing generator clock signal such that it comprises N phases, where N.gtoreq.2. As a result, each horizontal line of video data and the horizontal synchronization signals is phase shifted. This dual-shifting effect eliminates display image distortion that would result if only the video signal were shifted. Video distortion is further minimized by deriving the horizontal and vertical synchronizing signals from a common constant clock. EMI energy associated with each clock harmonic is spread by a frequency amount .DELTA.f proportional to the rate of phase change in the clock signal, the rate of phase change exceeding half the bandwidth f.sub.m of a standard EMI measurement reference window.

Abstract: In an electrical assembly with an electrical or electronic component part that generates a noise signal with a disturbing frequency, a parallel resonant circuit tuned to the frequency is arranged in the immediate proximity of the component part.

Abstract: The present invention relates to a circuit for eliminating radiated electric field noise in a video appliance which can completely offset radiated electric field noise generated on the front face of the CRT by variably adjusting and applying the waveform signal, the amplitude and phase of which are opposite to those of the radiated electric field noise formed on the front face of the CRT. The circuit for eliminating radiated electric field noise according to the present invention includes a high voltage ripple offset section including a cylindrical core, wherein a high voltage lead wire of the FBT passes through the cylindrical core, for eliminating a ripple component of the high voltage applied to the anode of the CRT according to the negative polarity pulse signal from the FBT induction coil, and an electric field noise offset section operable to offset the radiated electric field noise generated from the front face of the CRT by applying the negative polarity pulse signal to the periphery of the CRT.

Abstract: A video display appliance having a device for eliminating the radiation wave emitted from a cathode ray tube. The appliance includes a shielding wire wound one to several times along the periphery of a degaussing coil. The pulses having the same level and phase, but inverse polarity to those applied to an anode of the cathode ray tube, is applied to the shielding wire, thereby offsetting the radiation wave emitted from the cathode ray tube.

Abstract: An anode ripple voltage waveform is detected by a capacitor built into a flyback transformer. The detected waveform is then phased by a phasing circuit, amplitude adjusted by an amplitude adjusting circuit and subsequently delivered to an addition circuit. A horizontal component is detected by a horizontal output transformer, then phase adjusted by a phasing circuit and subsequently amplitude adjusted by an amplitude adjusting circuit. Thereafter, the horizontal component is added to the anode ripple component by the addition circuit, inverted and amplified by an inverting amplifier, and then supplied to an antenna arranged in proximity to the cathode ray tube. Thus, electric fields radiated from the face of the cathode ray tube are suppressed.

Abstract: Circuitry to control a power supply of a degaussing coil of a cathode ray tube, said degaussing coil is coupled to a main voltage supply through a switching device the circuitry has inputs coupled to a direct source of current of a switched mode power supply, the switched mode power supply comprises a switched mode transformer with primary windings coupled to the main source of voltage, and secondary windings and the switched mode power supply is switched in a first range of frequencies when the power supply is in a "standby" mode and in a second range of frequencies when the power supply is in an "on" mode wherein said circuitry comprising a detecting circuit which detectes a change in the range of switching frequencies when the power supply is switched from standby to on, the detecting circuit having an input coupled to a direct current source being downstream of a primary winding of the switched mode transformer and an output coupled to an input of a control circuit of the switching device the control circ

Abstract: The electron gun assembly for cathode ray tube, has the structure in which the first, second and third grids are arranged in the traveling direction of an electron beam emitted from cathodes, and so is the fourth grid to which a anode voltage is applied, a suppressing ring is provided to be adjacent to the second and third grids, a dynamic focus voltage which is varied in synchronism with the deflection of the electron beam is applied to the first and third grids, and the first and second grids are connected to each other by means of the resistor provided adjacent thereto.

Abstract: A display apparatus including a CRT having a deflection yoke, a plurality of field radiation restriction electrodes and a field radiation restriction circuit including an amplitude adjuster for applying, to at least one of the field radiation restriction electrodes, pulse voltage having polarity in reverse to the polarity of pulse voltage to be applied to the deflection yoke and a differential waveform adjuster for applying, to at least another field radiation restriction electrode, pulse voltage obtained by differentiating the pulse voltage to be applied to the deflection yoke.

Abstract: A structure for eliminating the noise in a light source device for an electronic endoscope safely eliminates the high-frequency noise produced from the lighting circuit, the xenon lamp and the like in the light source device. A capacitor for eliminating noise having a predetermined withstand voltage is connected between the support of the lighting circuit and the box body of the light source device so as to introduce the noise current produced by the switching operation of the lighting circuit to the ground. EMI springs are disposed between the outer peripheral surface of the conductive case of the lighting circuit and the xenon lamp and the inter peripheral surface of the box body of the light source device. A ferrite core for eliminating noise is provided on a conductive wire connecting the lighting circuit and the xenon lamp, thereby safely eliminating noise.

Abstract: An electric lamp assembly includes an electrodeless lamp having an electrodeless lamp envelope enclosing a fill material for supporting a low pressure discharge, a driving inductor including a magnetic core disposed in proximity to the lamp envelope and an input winding disposed on the magnetic core, a compensation loop disposed in proximity to the lamp envelope, a radio frequency power source and a compensation loop network. The compensation loop network has an input coupled to the radio frequency power source and outputs coupled to the input winding and to the compensation loop. The radio frequency power source and the compensation loop network supply radio frequency energy to the electrodeless lamp to produce a discharge in the lamp envelope and supply radio frequency energy to the compensation loop to generate a magnetic field that substantially counteracts a magnetic field produced by the discharge.

Abstract: A leakage flux canceling device is provided which requires a small number of parts and which has high space factor. A leakage flux canceling device 30 is mounted to a funnel side of a deflecting apparatus for reducing leakage flux to a panel side attributable to a horizontal deflection magnetic field, and comprises a ring-like body 32 having flanges 32 facing each other, a pair of bobbins 40 and 60 without cores formed on the flanges, a canceling coil 34 wound on each of the bobbins for canceling leakage flux, and winding grooves 48 and 68 formed in the respective bobbins such that the winding of each canceling coil has a greater length in the circumferential direction, and permitting the canceling coils to be wound from the outer surface side of the corresponding bobbins. The bobbins and the ring-like body are formed as a one-piece body, and the bobbins each have an arcuate shape matching the ring-like body.

Abstract: An automatic image rotation compensation circuit includes: a terrestrial magnetic field detecting unit for detecting horizontal and vertical terrestrial magnetic fields of a place where a display device is installed; an amplifying unit for amplifying the horizontal and vertical terrestrial magnetic field values detected by the terrestrial magnetic field detecting unit; an analog-to-digital converting unit for converting the analog terrestrial magnetic field values amplified by the amplifying unit into digital signals; a memory for storing image compensation reference values corresponding to various terrestrial magnetic field values; a microcomputer for receiving the digital terrestrial magnetic field values from the analog-to-digital converting unit and reading compensation values corresponding to the terrestrial magnetic field values; a digital-to-analog converting unit for converting the digital signals from the microcomputer into analog signals; and a deflection controller for performing a differential amp

Abstract: A device for shielding an electrical field emitted backward from a video display appliance. The device includes a device for shielding an electrical field emitted backward from a video display appliance including a CRT having an anode to which a high voltage is supplied, a deflection yoke for deflecting electron beams produced from electron guns, and a video board for processing and outputting video signals to the CRT, the device comprising, a first patterned section printed on a periphery of a back of the video board and connected to ground, and a second patterned section printed inside the first patterned section, the scond patterned section having a pulse applying portion to which a pulse voltage having a polarity opposite to the electric field waveform is applied and a termination portion.

Abstract: An auxiliary radiation shield for a CRT-type video display terminal includes a generally flat front portion having an at least partially transparent conductive central shield and an opaque frame-like conductive outer shield surrounding the central shield, with the transparent central shield having an area substantially equal to that of the faceplate of the CRT and the opaque outer shield having an area at least equal to that of the transparent central shield, whereby when the radiation shield is supported in front of the CRT with the transparent central shield disposed directly in front of the faceplate, the transparent central shield is in the path of the electrical field that would otherwise extend through the faceplate towards any user in front of the CRT, and the opaque outer shield intersects a substantial portion of the electrical fields that would otherwise extend from the sides and top of the CRT towards that user.

Abstract: EMI suppression in electrodeless discharge lamps by inward RF-reflectance from the enclosure walls (12) of 90%+ and use of an absorber (16) of RF power having an absorption coefficient greater than 40%, a transmission coefficient less than e.sup.-3, and an effective area facing the interior of the enclosure between 5% and 40% of the area of the RF-reflective light transmissive enclosure.

Abstract: A transparent conductive film is formed on an outer surface of a face portion of a face panel and a phosphor screen is formed on an inner surface thereof. A conductive explosion proof band is wound around an outer periphery of a skirt portion of the face panel and the explosion proof band has a grounding potential. A conductive tape is attached along a long side of the face panel and electrically connects the transparent conductive film with the explosion proof band. A compensating electrode extending along a side of the face panel is attached to an upper side of the skirt portion and disposed on a side opposite to the conductive tape with respect to the explosion proof band. An inverse voltage applying portion applies a voltage having a waveform of a polarity inverse to that of the deflection voltage applied to a deflection device to the compensating electrode so as to generate an electric field for canceling an alternating electric field generated from the deflection device.

Abstract: An electrodeless fluorescent lamp having an emission suppression arrangement utilizing a capacitive filtering element formed by a first conductive layer disposed on a portion of the interior surface of the lamp envelope, a second conductive layer on a corresponding external portion of the lamp envelope and the glass material of the lamp envelope disposed therebetween, achieves significant emission reduction yet at the same time reduces eddy current losses otherwise occurring at the second conductive coating portion of the capacitive filtering element. A plurality of slots formed in the second conductive coating are effective so as to reduce the circular flow of eddy currents around the second conductive layer, such eddy currents as would otherwise adversely affect the Q of the circuit.

Abstract: A device for removing electric field of a display according to the present invention comprises: a voltage generator connected to a horizontal deflection output circuit of a CRT and generating an antiphase reverse pulse having a frequency band equal to that of a horizontal output pulse; a reverse pulse sensor made of a conductive material, insulated at a given location in the front part of the CRT, and generating the reverse pulse around the CRT; and a connector for detecting the reverse pulse of the voltage generator, connected to ground at one end thereof and the reverse pulse sensor at the other end thereof, and sending the reverse pulse to the reverse pulse sensor.

Abstract: A device for eliminating low frequency radiation of a computer monitor is disclosed, including a pair of first conductive plates disposed on two opposite sides of a cathode ray tube of the monitor to generate a radiation signal thereon that is induced by the low frequency radiation of the monitor, the radiation signal being applied to a circuit which amplifies and inverts the radiation signal to generate an in inverted and amplified output signal, the output signal being applied to a pair of second conductive plates arranged on another two opposite sides of the cathode ray tube to cancel the low frequency radiation of the cathode ray tube.

Abstract: The present invention is directed to methods and apparatus for enhancing the performance of visual display units which utilize plasma display panels. More specifically, the present invention provides methods and apparatus for providing an optically enhancing/noise suppressing device for positioning in front of the viewing surface of a plasma display panel. The device also increases the impact resistance of the PDP. The device of the present invention is manufactured separately from the PDP. The device may be provided with attachment means for securing the device to the surface of the visual display unit in a position in front of the viewing surface of the PDP or may be designed to be free-hanging, i.e., suspended, or otherwise positioned in front of the viewing surface of the PDP.

Abstract: The invention provides a device for effectively decreasing the electric field irradiated from the front surface of a CRT display. This device cancels the leakage field composed of a deflection component and a high voltage ripple component irradiated in the front direction of the CRT by generating an inverse electric field composed of the deflection component and high voltage ripple component. The inverse electric field is obtained by detecting an alternating-current voltage irradiated in the anode portion of the CRT by capacitive coupling a detector to the anode, inverting and amplifying the detected voltage, and applying the inverted voltage to an inverse field generating means installed near the front surface of the CRT.

Abstract: A video display appliance comprising a cathode ray tube 2 having a deflection yoke 22 mounted thereto, a cabinet 4, and a back cover 6, the cabinet and the back cover being connected to house the CRT. The video display appliance also comprises a magnetic field absorbing coil 30 placed between a glass envelope 12 and the deflection yoke 22, a magnetic field remover 25, a back plate 34 mounted on a video board 27, a below plate 28, and a shielding member 60, 160 or 260 secured detachable to the inner surface of the back cover 6, for shielding the electromagnetic field emitted from the deflection yoke. The shielding means comprises an oblong closed-loop wire 62, 162, 262 or 265, and lead wires 64 having at each end a ground terminal. Accordingly, the electric field emitted in an upward direction from the deflection yoke is easily eliminated by means of the shielding member having a simple construction and being easily installed.

Abstract: An electromagnetic field shielding circuit is disclosed. The circuit comprises a phrase inverting circuit, coupled to a turn in the secondary windings, for generating an inverted phase with respect to a phase of a voltage signal induced to the anode electrode from the secondary windings. An oscillation circuit oscillates a voltage signal output from an output node of the phase inverting circuit. The oscillating circuit matches an oscillating signal with a high voltage level signal. An electromagnetic field generation circuit applies a voltage signal output from an output mode of the oscillation circuit. This generates an electromagnetic field responsive to the voltage signal substantially around the circumferential periphery of the front portion of the picture tube. This electromagentic field cancels and shields the electromagnetic field generated from the anode.

Abstract: In a cathode ray tube having an antistatic film 6 stuck to the front surface of a panel section 1 and a conductive tape 7 for grounding the end portion of the antistatic film 6 to the earth, a silicone adhesive 8 containing a conductive filler having an excellent close contact adhesion to silicon dioxide (SiO.sub.2) is interposed in at least a part of an close contact adhesion portion where the conductive tape 7 is stuck to the antistatic film 6. Thanks to the interposition of the conductive filler containing silicone adhesive 8, the resistances between the antistatic film 6 and the conductive tape 7 and between the silicone adhesive 8 and the conductive tape 7 can be lowered and sputtering which may be caused by the high voltage induced in the antistatic film 6 is prevented, so that the breakage of the antistatic film 6 can be prevented at the close contact adhesion portion.

Abstract: A graphics controller uses spread-spectrum techniques to modulate the pixel clock over a range of frequencies, reducing the maximum intensity of EMI emissions. When the clock input to the graphics controller is replaced with a modulated clock, the image on a CRT is distorted. Distortion is avoided by only modulating the clock to the flat-panel LCD interface. The vertical and horizontal timing signals for both the CRT and the LCD are generated from the un-modulated clock. Using the un-modulated clock for these critical timing signals ensures that each horizontal line is displayed for the same period of time. Brighter and dimmer lines are thus avoided. A second embodiment modulates the clocks to the CRT and LCD, reducing emissions for both interfaces. Even the timing signals use the modulated clock. The frequency sweep of the modulated clock is reset at the end of every horizontal line. Thus all lines are displayed for the same period, although the transfer of pixels within a line are modulated.

Abstract: Apparatus for mitigating the adverse effects of magnetic interference on the operation of a CRT is provided. More specifically, magnetic sensors are placed in a gap formed between a front bezel and a rear enclosure comprising a magnetic shield enclosing all but the viewing surface of a CRT. The gap serves to concentrate the on-axis magnetic field and the resultant signal from the sensors is amplified to drive current through a compensation coil located inside the front bezel and in front of the viewing surface of the CRT. The current generates a compensation field that mitigates the incoming on-axis magnetic field. The ambient magnetic field is also sensed by a three axis magnetic sensing assemblage located outside the magnetic shield. The output of the sensing arrangement is operated on to produce a trigger to start a degauss cycle.

Abstract: A display comprising a cathode ray display tube (1) having an electromagnetic deflection yoke (2) is described. A pair of first deflection coils (7,6) are located symmetrically about the longitudinal axis of the tube (1) on opposite sides of the yoke (2) for producing within the tube (1) a first magnetic deflection field. A pair of second deflection coils (8,20) are similarly located symmetrically about the longitudinal axis on opposite sides of the yoke (2) for producing within the lube (1) a second magnetic deflection field at right angles to the first deflection field. The display is further provided with a pair of first cancellation coils (4,3) connected to the first deflection coils (7,6) for producing a first cancellation field which tends to cancel a first stray field produced by the first deflection coils (7,6). Support means (10,11) secure the first cancellation coils symmetrically about the longitudinal axis.

Abstract: An improved spot elimination circuit for a monitor capable of Display Power Management Signaling function prevents an occurrence of a focused beam spot from the phosphor screen of a cathode ray tube in the monitor by suddenly dropping the potential level of a high voltage. The circuit includes a high voltage generator, a X-ray sensor, a X-ray protector, a controller and a spot killer circuit. The spot killer circuit actuates the X-ray protector to virtually instantaneously shut down a high voltage generated from the high voltage generator in response to a logic signal indicative of absence of a vertical synchronizing signal. The controller determines the vertical sync signal and generates the logic signal. Accordingly, the phosphor screen of the cathode ray tube is protected from excessive cathode luminance at a focused spot which can cause degradation of the screen.

Abstract: An electrodeless, low pressure gas discharge lamp includes a vitreous envelope containing a discharge medium and being shaped with an external chamber for receiving an electrical excitation circuit. The excitation circuit is effective for exciting the discharge medium to emit light with electromagnetic fields that are generated by the excitation circuit. A circuit is included for supplying electrical power from power mains to the excitation circuit. A transparent, electrically conductive coating is provided atop the vitreous envelope and is electrically connected substantially directly to one of the power mains at any given time. A transparent, electrically insulative coating is disposed atop the electrically conductive coating, and comprises a contiguous, inorganic glass layer. The insulative coating preferably has a minimum coating thickness of at least about 3.1 microns.

Abstract: A color display device comprising a cathode ray tube and a deflection unit also includes a compensation coil or a compensation-coil system, for example, on the outside of the yoke of the deflection unit, so as to compensate for frame errors and convergence errors caused by the earth's magnetic field.

Abstract: A discharge lamp, such as a neon lamp or a subminiature fluorescent lamp, includes an elongated tubular lamp envelope containing a fill material for supporting a light-emitting discharge and electrodes mounted at opposite ends of the lamp envelope. A light-transmissive conductive coating on the lamp envelope substantially attenuates emission of RF energy. A conductor in electrical contact with the conductive coating couples the conductive coating to a reference potential, such as ground. The conductor may be a metal or conductive silicone strip in electrical contact with the conductive coating along the length of the lamp envelope. The discharge lamp may be connected to a ballast circuit by coaxial cables. The outer conductor of each coaxial cable is connected to the conductive coating to form a continuous RF shield. The conductive coating and/or the metal strip may be used for heating of the discharge lamp.

Abstract: A cathode-ray tube apparatus capable of reducing a high frequency electric field radiated from the deflection yoke and the deflection and high voltage circuit to the outside of the cathode-ray tube apparatus. Mounted on the deflection yoke or on the cathode-ray tube are an induction coil for generating a pulse voltage opposite in polarity to a high pulse voltage applied to the h and an electric field cancellation electrode made of a conductive wire to which the opposite polarity pulse voltage is applied. When the opposite polarity pulse voltage is applied to the electric field cancellation electrode, the electric field cancellation electrode radiates an electric field opposite in polarity to the high frequency electric field radiated from the deflection yoke to the outside of the cathode-ray tube apparatus to reduce the intensity of the high frequency electric field.

Abstract: A CPU is designed so as to put a demagnetizing circuit in an operative state in accordance with a result of detecting, among other quantities or events, the number of operations to turn on a power counted by a counter, the lapse of time under a predetermined condition measured by a timer since the pulling-out of an AC plug, the movement of the main body of a display device sensed by a sensor unit, an external magnetic field sensed by a sensor unit or a residual magnetism in a CRT itself sensed by a sensor unit. Instead of carrying out demagnetization each time the power is turned on, demagnetization is performed only under certain conditions when necessary, diminishing the problem of wasteful power consumption. On the top of that, the number of cases in which sound and picture vibration are generated due to a demagnetizing operation carried out right after the turning-on of the power is reduced, resulting in a product easy to handle by the user.

Abstract: A cathode-ray tube display unit provided with a high voltage transformer for supplying high voltage to an anode of a cathode-ray tube, a deflection yoke having a horizontal deflection coil and a vertical deflection coil, and an interior conductive coating formed on the inside of a glass vessel of the cathode-ray tube, in which there is provided an electrode in the conductive coating form formed on an external wall face of a glass vessel at a funnel portion being electrically separated from an exterior graphite coating formed on an external surface of the cathode-ray tube and connected to ground, and a circuit for applying reverse pulse voltage V.sub.1 that satisfies (V.sub.0 .times.C.sub.0)>(V.sub.1 .times.C.sub.1) to the electrode in the conductive coating form is included. Where, it is assumed that flyback pulse voltage supplied to the deflection yoke means is V.sub.0, reverse pulse voltage having a polarity reverse to that of voltage generated in the interior conductive coating is V.sub.

Abstract: This invention relates to a magnetron of a microwave oven is disclosed including a lead for supporting a filament, and a filament terminal for electrically connecting the lead and a choke coil, wherein the filament terminal has a slit and serves to cut off unnecessary high harmonic leaked out to an input of the magnetron.

Abstract: A plug has a two-part housing accommodating a printed board with an electrical screening element for preventing propagation of electrical disturbing radiation during the operation of a gas discharge lamp. A mass of a durable elastic material such as silicon is applied on a part of the periphery of at least one screening element between the screening element and the adjoining housing part. The inner space of the housing is filled with a casting mass of an electrically insulating material in which also an elastic mass is enclosed. The elastic mass uncouples the screening element from the housing and from the casting mass, so that a thermal expansion of the screening element is possible and also vibrations of the plug are not rigidly transmitted to the screening element.