Abstract: A deflection yoke apparatus has a pair of horizontal and a pair of vertical deflection coils, a coil separator therebetween, and a funnel-shaped deflection core which provides a magnetic path for magnetic flux generated by the deflection coils. A pair of auxiliary coils are arranged at diametrically opposed positions outside the deflection core, and may be energized by the horizontal deflection current supplied to the horizontal deflection coils. The magnetic field generated by the auxiliary coils at least partially compensates the external magnetic leakage field which is radiated outside the deflection core by the horizontal deflection coils. The auxiliary coils have rod-shaped magnetic cores which are in magnetic flux coupling relationship with the smaller end of the deflection core. Leakage flux compensation is thereby achieved with minimal affect on the deflection fields and with low power dissipation in the auxiliary coils.

Abstract: Methods and apparatus for securing a degaussing coil to a cathode ray tube (CRT) are disclosed wherein one or more restraint cables are used together with one or more cable ties to secure and position a degaussing coil onto a CRT. The method and apparatus of the present invention compensate for variations in the length of the degaussing coil without compromising the positioning of the degaussing coil on the CRT.

Abstract: An electric field cancellation apparatus that can reduce electric field radiation from a cathode ray tube inexpensively includes a canceling pulse generating circuit generating a pulse voltage that cancels a leaked electric field radiated from a high voltage generating circuit employed with a deflection circuit or the like. The canceling pulse voltage is superimposed upon an output voltage of the high voltage generating circuit and is applied through an anode to an aperture grill of the cathode ray tube, whereby an electric field having a phase opposite to that of the leaked electric field is radiated from the whole surface of the aperture grill, so that the leaked electric field radiated from the cathode ray tube can be canceled.

Abstract: A deflection yoke is mounted with a leaked magnetic-field canceling coil installed on a screen portion for attenuating externally emitted leakage magnetic field, using a horizontal deflection coil. The leaked magnetic-field canceling coil includes a bottom side in parallel with the surface of the screen portion of a coil separator contacting the horizontal deflection coil, left and right sides extending from both ends of the bottom side to an apex peak point to be set in the range of 1/4 of the length of the bottom side from the alternative one end of the bottom side; and and a first and second diagonal sides straightly connecting one end of the left and right sides to the right and left ends of the bottom side, respectively.

Abstract: A supporting member for a VLMF coil having a coupling portion with the same curvature as that of the corner portions of a CRT and a transversely elongated slot for inserting the VLMF coil. The supporting member protects the VLMF coil from any deformation or displacement and secures the VLMF coil even against external impacts so that leaking magnetic fields can effectively be offset by the VLMF coil.

Abstract: A cathode ray tube having degaussing coils attached to an outer side of a glass vessel of a funnel part of a main body of the cathode ray tube, in which the degaussing coils each include a flattened part, extended along the outer front surface at a front side of a funnel part, a circular part having a circular cross-section and a transition part interconnecting the end parts of the flattened part and the circular part and changed in cross-section shape from a flattened rectangle to a circle. The degaussing coil may has shape flattened partially to reduce the outer size of the cathode ray tube and includes a plastic case for retaining the coil in the flattened shape. The degaussing coil is stabilized in shape and is not deformed during transport while its attachability with respect to the cathode ray tube may be improved.

Abstract: A fast reset degaussing system includes a full wave rectifier bridge having a degaussing coil coupled in series therewith to a source of operating AC power. A variable current element is provided by a field effect transistor which produces a variable load upon the full wave rectifier bridge. An RC charging circuit is coupled to the control electrode of the field effect transistor to cause an exponentially decaying current within the transistor and thereby impose an exponentially load upon the full wave rectifier bridge. The degaussing coil current responds directly to the load imposed upon the rectifier bridge by the field effect transistor and produces an exponentially decaying alternating current suitable for cathode ray tube degaussing.

Abstract: A predetermined rush current is set by a current setting switch (25). A digital-to-analog (D/A) converter (27) multiplies an attenuation curve signal input thereto from a read-only memory (ROM) (28) and the rush current thus set by the current setting switch (25) with each other and outputs a multiplied output to a D/A converter (29). The D/A converter (29) multiplies a signal input thereto from the D/A converter (27) and a sine wave signal read out from a ROM (30) and output a multiplied output to a field effect transistor (FET) (22) through an operational amplifier (24) to thereby control a degaussing current flowing through a degaussing coil (5). Therefore, a stable degaussing effect can be reproduced.

Abstract: A storage node of a stacked capacitor in a DRAM comprises a first part connected to a source/drain region and a second part protruding upward from a substrate in a vertical wall shape. The second part includes a concave part in the inner part which is removed by etching. Steps are formed on the inner and outer peripheral surfaces of the vertical wall part. The steps are formed by a self-alignment method using a sidewall insulating layer formed by anisotropic etching. Capacitance of the capacitor is increased by forming steps on the surface of the storage node.

Abstract: A demagnetizing circuit for a color picture tube includes a parallel combination of a relay coil and a negative temperature coefficient (NTC) resistor in series with the primary of the power supply transformer. The contact of the relay is connected into the degaussing circuit. As the NTC warms up the current through it increases and the current through the relay coil correspondingly decreases. When the current through the relay coil falls below the relay holding current the relay contact opens and the demagnetizing current ceases to flow.

Abstract: An improved degauss coil for use with cathode ray display tubes is disclosed. The degauss coil is formed from conductive traces placed directly on to a plastic part attached to or adjacent the front bezel surrounding the cathode ray tube. Alternatively, the conductive traces may be placed directly on to the bezel itself. The invention allows for a very narrow bezel border surrounding the cathode ray tube.

Abstract: A degaussing current whose frequency is L Hz is supplied to a degaussing apparatus, and a constant amplitude vertical deflection current whose frequency is M Hz is supplied to a deflection yoke. The degaussing current is an A.C. current, and its frequency L Hz is determined such that the value of M/L is not an integer.

Abstract: The circuit includes a probe (6) for detecting a horizontal magnetic field and a first and a second circuit means (15, 17) driven by said probe (6) so as to create respective axial and lateral components of compensation of the horizontal magnetic field, that are in the same direction and of equal intensity, but of opposite sign to that of the magnetic field under test.

Abstract: The invention provides a degaussing circuit using a relay having the circuit for the TV of a remote controller type including the standby-power taking-out device to drive a MICOM, the degaussing device using the applied ac power and the drive-power taking-out device to drive a TV, the device including; a control device to control said degaussing device, the drive-power taking-out device, and the standby-power taking-out device through the relay and to drive the TV, located among the output stage of the standby-power taking-out device, the input stage of the degaussing device, and the input stage of the drive-power taking out device. Obtaining the cleaner screen may be attained according to the present invention.

Abstract: A compensating coil for a scanning electron beam display, such as a color television tube, reduces undesirable deflection of the electron beams due to ambient magnetic fields, in particular the geomagnetic field. The coil has a winding disposed to encircle the tube neck, perpendicular to the Z axis. A degaussing coil is positioned on the tube envelope to provide for demagnetizing metal structures within the envelope. In order to provide more complete degaussing, the supply current to the compensating coil is interrupted during the degaussing operation. In order to prevent a charge from accumulating on the compensating coil, one terminal is coupled through a resistor to a source of reference potential.

Abstract: The device comprises a demagnetization coil (1) wound from electrically conducting insulated wire (5) and surrounded by an electrically insulating sheath (7). A connection member (17) is connected to the two ends of the wire (5). The connections (19) between the connection member (17) and the wire (5) are surrounded by an electrically insulating envelope constituted by a sheet (21) of electrically insulating foil, which is folded so that the connections (19) and the adjoining parts of the sheath (7) are disposed between the facing parts of the sheet (21). The edges of the sheet (21) conducting each other are connected to each other by means of a welding connection (23). The sheet is further connected by means of a welding connection (23) to the sheath (7) and to an envelope of the connection member (17). The sheet 21 constitutes an envelope for the connections (19), which is tight but for one lead-through opening for the connection member (17).

Abstract: A circuit for demagnetizing a mask in a color picture tube of a television receiver, in which a resistor with positive temperature coefficient is applied to the input alternating current when the receiver is turned on. A bridge rectifier is connected with one terminal, to a first pole of the alternating current source, via the demagnetizing coil that is mounted on the picture tube, and the resistor. The bridge rectifier has another terminal connected to a second pole of the alternating current source. A variable electronic switch interconnects the direct-current output terminals of the bridge rectifier. The variable electronic switch is controlled to continuously decrease current flowing through the demagnetizing coil to zero. For this purpose, a controlling voltage is obtained from a winding in a horizontal-frequency synchronized power-intake stage by flyback rectification.

Abstract: A cathode ray tube has a funnel provided with an outer conductive coating that is electrically isolated from an AC mains supply. An insulated degaussing coil is fitted to the funnel against the outer conductive coating and energized by the AC mains supply in an electrically nonisolated manner. A spring includes a resilient body forming a spring action that snugly fits the degaussing coil against the outer conductive coating. The spring includes a clip for attaching the resilient body to the degaussing coil. At least one of the clip and the resilient body is made of an insulated material for preventing the resilient body from providing a conductive path with respect to electrical shock hazard between the degaussing coil and the electrically isolated outer conductive coating.

Abstract: An arrangement for compensating against the magnetic field of the earth in a picture tube in remote-controlled video-display equipment, in which a compensating voltage is generated by a remote-control channel in the video-display equipment. This voltage is applied to a compensation coil in the picture tube. Current through the coil is adjusted in finely-divided incremental steps, and the current is continuously adjustable. The compensation voltage is applied to one end of the compensation coil, whereas the other end of the coil is supplied with substantially half of the operating voltage of the display equipment.

Abstract: A degaussing circuit for degaussing a cathode ray tube has a degaussing coil mounted on the back of the catode ray tube and a positive temperature coefficient thermistor connected in series with the degaussing coil. The resonance frequency determined by the degaussing coil and the positive temperature coefficient thermistor is set to be below about 14 kHz or above about 17 kHz.

Abstract: In a television receiver, a magnetic field compensator of a horizontal component of the earth's magnetic field includes a fluxgate magnetometer having a pair of sensing windings for generating first and second sensing signals representative of corresponding components of the horizontal component of the earth's magnetic field. The sensing signals generate current in a pair of substantially planar coils disposed in a non-parallel vertical configuration on the rear periphery of a cathode ray tube. The currents in the coils produce a magnetic field that compensates or neutralizes the effect of the horizontal component of the earth's magnetic field on the electron beam in the cathode ray tube. Whenever the position of the receiver is changed, rotationally or geographically, the current in the coils is automatically adjusted to provide automatic neutralization.

Abstract: A magnetic shielding for a cathode ray tube. A magnetic shielding case surrounds the CRT funnel and side portions of the CRT front panel. Additionally a current coil is wrapped around the CRT. In one embodiment, the coil is wrapped completely inside the shielding case. In another embodiment, the coil is wrapped partially inside the shielding case and partially outside.

Abstract: To improve the trichromatic cathode tube shielding effect given by the frame-mask set and by a shielding material made with material of low magnetic permeability, the external conductors of a de-magnetization coil with two loops are made to pass in front of the fastening lugs and not behind the frit plane as was the case before, and the position of the internal conductors is set to obtain the best compromise.

Abstract: The present invention provides an improved grounding system for a kinescope having a conductive outer coating. The system includes a conductive metal tape having an adhesive on one surface thereof and exposed metal on the other surface thereof. The metal tape is adhered to the kinescope by its adhesive side. The metal tape extends from the conductive outer coating to means on the kinescope connecting to an electrical ground, and it is in electrical contact with the coating and interconnecting to the electrical ground through the means.

Abstract: A degaussing circuit for a video apparatus incorporates circuitry that controls various aspects of the degaussing operation. The control circuitry causes the degaussing current to be terminated after a period of time to eliminate the flow of residual degaussing current. The control circuit also causes the degaussing circuit to be reset, to enable redegaussing to occur. The control circuit also prevents redegaussing from occurring after a brief interruption of power to the video apparatus.

Abstract: A device for demagnetization of the picture tube of a television receiver and earthing of the conductive coating applied to the cone of the tube includes a demagnetization coil system (4) constituted by a bundle of insulated electric wires held together and forming at least one loop applied to the cone of the tube. The wires of the strand are held together by a tape of plastic material wound helically around them, while a bare electric wire (1) is wound helically with the same pitch as the tape. This wire is connected to earth (15, 16).

Abstract: A proximity switch including a base assembly rotatably carries a sensing head formed of a support part rotatable about one axis extending through a base assembly for positioning a sensing face on a complementary sensing part in any one of four planes parallel to the one axis. A pivot between for the support and sensing parts enable the sensing face to be placed in a plane transverse to the one axis by rotation about a second axis at 45.degree. to the one axis. Flexible connections extend along the one axis and stops between the sensing and support parts avoid undue twisting of the connections. An annular printed circuit board supported by the base assembly and a plurality of fine wires carried on an elastomeric member supported in the support part provides separable multiple connections between each conductor on the board and the flexible connections.

Abstract: A degaussing system for a CRT includes a voltage source, which is enabled by power-up of the CRT, coupled to a tank circuit including a degaussing coil and a capacitor. A voltage sensing network connected in parallel with the tank circuit senses the voltage across the capacitor and when that voltage rises to a predetermined threshold, and actuating signal is provided which turns on a latching switch circuit which enables a switch connecting the tank circuit to ground. This allows it to oscillate, taking the metal components of the CRT through a decreasing series of hysteresis loops as the oscillation decays. The latching switch circuit maintains the switch in an on position until power-down of the CRT, thus maintaining all except R1 which aids grid regulation of the components of the degaussing system, in a low voltage state until degaussing becomes necessary once again.

Abstract: A color cathode ray tube display includes a degauss coil and a switched mode power supply. The degauss coil is connected in series with the input rectifier (5) of the SMPS to limit the current surge on power on but is shorted out by a switch, preferably constituted by a triac, after the SMPS switching transistor turns on to give substantially zero residual degauss current. Forward voltage drop across the triac can be compensated for by back-to-back diodes (13) connected in series with the degauss coil. The triac is switched under control of a signal from an auxiliary winding on the SMPS output transformer (a).

Abstract: A degaussing apparatus for a video display includes a degaussing coil and a source of degaussing current. A switching means is coupled to the degaussing coil and to the source for providing a path for degaussing current between the source and coil during a degaussing operation. First and second PTC elements, functioning as degaussing current reducing means, are coupled to the degaussing coil and to the switching means. The switching means produces alternate coupling of the first and second PTC elements to the degaussing coil with respect to successive degaussing operations.

Abstract: A degaussing circuit for a cathode ray tube, of a video display apparatus includes a resonating capacitor that is charged prior to degaussing. A degaussing coil is disposed about the cathode ray tube. An SCR, responsive to an on/off control signal, is turned on by a control switch for coupling the resonating capacitor to the degaussing coil in order to generate an AC, degaussing current in the coil having an amplitude that diminishes to a low amplitude during a degaussing interval. Positive feedback is used for speeding up the turn-on time of the control switch. A series pass transistor switch couples a source of a supply voltage to a delay network. The series pass transistor switch is coupled in the current path of the current that is supplied by the power supply. An energizing voltage is developed at the output of the delay network.

Abstract: A mounting and retaining assembly for a degaussing coil and ground strap for use on a cathode ray tube includes a flexible wire form that is held in place by the tube tension band. The wire is bent to form separate regions that receive the degaussing coil and ground strap. When the degaussing coil and ground strap are in place, the wire is under tension which holds the degaussing coil and ground strap firmly against the rear surface of the tube. The mounting and retaining assembly also includes retaining clips that cooperate and are held in place by the tube mounting lugs. The clips incorporate retaining loops that also receive and retain the degaussing coil and ground strap at other points.

Abstract: A resonant degaussing circuit for a video display apparatus permits frequent degaussing during operation of the display apparatus. In order to provide effective degaussing for large screen cathode ray tubes, an inductor is connected in parallel with the degaussing coil. The inductor increases the degaussing resonant frequency so that a greater number of resonant cycles occur before the degaussing current decreases below a predetermined level.

Abstract: A supply arrangement selectively operates from either one of dual AC mains supply voltages of, illustratively, 220 or 110 volt RMS AC. When the arrangement operates from the 220 volt AC mains supply voltage, a bridge rectifier, operating as a full-wave rectifier, charges each of series coupled first and second capacitors to one-half the peak of the AC mains supply voltage. During the positive half-period of the AC mains supply voltage, a positive voltage, equal to the difference between the instantaneous mains supply voltage and the DC voltage across the first capacitor is coupled between two terminals of a load such as a degaussing circuit. A corresponding negative difference voltage, is coupled between the two terminals during the other half-period.

Abstract: A degaussing coil and a capacitance are coupled in a resonant circuit by a switch to effect degaussing of a kinescope. The capacitance is charged by a source of relatively high voltage. A control circuit controls the operation of the switch and is responsive to a change in operating voltage applied thereto for operating the switch to effect complete discharge of the capacitance in a relatively short interval.

Abstract: To correct the beam direction, and thus the color purity of color television tubes, particularly in tubes having fixedly secured deflection systems (10), the deflection field is, upon adjustment for color purity, additionally modified by introducing a unidirectional magnetic field extending with its field lines parallel to the z-axis of the tube. After adjustment to move a predetermined color, for example red, from non-deflected or hardly deflected central beam positions into the center of the CRT, the d-c unidirectional field is then disconnected, and the apertured mask demagnetized, as conventional. For demagnetization, the already present demagnetization coil (9) on the tube may be used, by applying a constant voltage thereto, for example of 12 V. The decaying demagnetizing field can be derived from a transformer connected to network power (FIG. 2) or through an oscillatory circuit formed by a charge capacitor (17).

Abstract: A PTC thermistor device includes three PTC thermistors aligned and disposed in a heat transmission relation to each other such that the center PTC thermistor provides heat to the other PTC thermistors which are so connected as to define a part of path for the demagnetizing current. The two PTC thermistors positioned on the opposite sides of the center PTC thermistor increase their temperature rapidly so that a rapid and effective attenuation of demagnetizing current can be obtained.

Abstract: A CRT in a CRT device is degaussed following a timed period of device inactivity and while the screen of the CRT is darkened, as well as at device turn-on or at manual activation. The screen stays darkened until data is inputted, and degaussing reoccurs during each subsequent timed period of inactivity.

Abstract: A degaussing system in a CRT device detects a trigger pulse and provides a timed control pulse which controls a power circuit "on" time. The power supplied to the degaussing coil is gradually reduced by the increasing resistance of a PTC thermistor in series with the degaussing coil, then turned off by the end of the control pulse. Degaussing can be initiated manually or automatically as often as desired, and may be triggered automatically in response to a predetermined period of device inactivity.

Abstract: A switched mode power supply for a remote controlled television receiver incorporates a degaussing circuit having a relay that is required to be energized in order to permit operation of the degaussing circuit. Power to energize the relay is derived from a power supply switch transistor protection circuit which removes residual stored energy from the power transformer primary winding. This stored energy is used to charge a capacitor during the time the switch transistor is nonconductive. The capacitor is discharged to provide current to energize the deguassing circuit relay in order to permit ac mains current to flow through the degaussing coil.

Abstract: A demagnetizing coil is situated in an aperture frame removably mounted around the picture screen of a picture tube.

Abstract: A component consisting of two coupled PTC thermistors with the first thermistor having a lower cold resistance than the second thermistor and the first thermistor having a higher resistance at the operating temperature than the second thermistor. According to the invention, the electric connection to the second thermistor is made directly by solely mechanical contacts to the surface of the ceramic thermistor body. This means a considerable simplification during manufacture, as the second thermistor need not be provided with electrode layers.

Abstract: A single degaussing coil for a kinescope has a first portion located along a first side of the base of a generally pyramidal kinescope envelope or bulb. Second and third portions of the coil extend along portions of second and third sides of the base, and are joined by a fourth portion of the coil lying between the juncture of the neck and the bulb.

Abstract: In a remote controlled color television receiver, the television receiver power supply is responsive to the state of an on/off command signal. A DC supply voltage is applied to an input terminal of the power supply during both states of the on/off command signal, with the power supply developing an operating voltage at an output terminal only during the on-state of the command signal. A relay type switch is coupled to a degaussing winding and a source of alternating polarity voltage. The switch is responsive to the presence of the operating voltage and applies the alternating polarity voltage to the degaussing winding to generate degaussing current during the occurrence of, illustratively, the on-state of the command signal.

Abstract: A degaussing network of a remote controlled color television receiver is energized by a remote-responsive power supply rather than by the contact closure of a mechanical or electromechanical switch. The power supply includes a series-pass semiconductor element for developing a direct current voltage at an output terminal of the power supply derived from a source of alternating current voltage coupled across two input terminals. The regulator control circuit for the semiconductor element is responsive to the state of an on/off command signal. The power supply operates during the on-state of the command signal to provide the direct current voltage at the output terminal. The power supply regulator control circuit maintains the semiconductor element nonconductive in the off-state. The degaussing network, including a degaussing winding and a thermistor, is coupled to the output terminal of the power supply.

Abstract: A combined magnetic shielding and degaussing structure for an in-line color picture tube comprises magnetizable shielding plates of an extended surface area each located at a corner of the picture tube and two vertically oriented magnetizable strips. Each strip connects upper and lower corner shielding plates on one side of the picture tube. The shielding plates guide stray magnetic flux into the strips and away from the picture tube interior in order to provide magnetic shielding. A degaussing winding is wound around the vertical axis of each strip and generates a degaussing flux which flows through the shielding plates and into the color picture tube shadow mask.

Abstract: A degaussing circuit for a color television receiver, in which the degaussing coil is in series with a PTC thermistor to which an NTC thermistor is thermally coupled and which is at the same time a protection resistance for a supply voltage circuit in the receiver.

Abstract: A circuit arrangement for the demagnetization of color television receivers, in particular small battery fed receivers, comprising first switch means for charging a first capacitor immediately before demagnetization and second switch means adapted to be activated after the charging of said first capacitor for causing the capacitor to discharge through the demagnetization coil with short lasting current pulses of alternating direction. The arrangement comprises a second and smaller capacitor, which is charged and discharged by the current flowing through the demagnetization coil, this sequence being repeated in cyclic order.

Abstract: A degaussing circuit, for example for a color television receiver, in which the degaussing coil is in series with a PTC-thermistor and in which the series arrangement thus formed is in parallel across a second PTC thermistor and across an a.c. voltage source, for example the supply mains. The thermistors are thermically coupled.