Abstract: A high power factor conversion circuit suitable as a ballast circuit for lamps includes a full-wave rectifier coupled to an AC potential source and providing a pulsating DC potential. A high frequency inverter is coupled to a load circuit and to a feedback rectifier circuit supplying a rectified high frequency potential to an energy storage feedback circuit which provides energy in a manner to inhibit a decline in the pulsating DC potential thereby providing a substantially uniform DC potential to the high frequency inverter.
Abstract: In a color cathode ray tube deflection apparatus having a deflection yoke with horizontal, vertical and quadrupole windings and affixed to a color cathode ray tube, a quadrupole convergence circuit includes a quadrupole winding coupled to a source of substantially parabolic-shaped horizontal and vertical frequency signals and coupled by a signal clamping circuit which is, in turn, shunted by an impedance varying in proportion and an opposite direction to variations in the impedance of the clamping circuit as determined by the value of the substantially parabolic-shaped vertical frequency signal whereby convergence at the corners of a cathode ray tube is enhanced.
Abstract: A horizontal electron beam crossover correction circuit for an in-line color cathode ray tube having an associated toroid-wound deflection yoke with first and second horizontal deflection windings each having first and second winding portions coupled to a horizontal deflection signal source includes an adjustable impedance shunting at least one of the winding portions of one of the first and second horizontal deflection windings for controlling current flow in one with respect to the other of the winding portions.
Abstract: In a top-bottom pincushion correction circuit having a saturable reactor with a control winding coupled to a source of deflection current at a horizontal scan frequency and an output winding coupled to a source of deflection current at a vertical scan frequency, a means coupled to the control winding unbalances the waveform applied thereto from the source of deflection current at a vertical scan frequency to provide asymmetric top-bottom pincushion correction.
Abstract: A light-indicator circuit is disclosed which permits visual indication of clipping caused by the over-driving of a transistor amplifier. The circuit includes a light-emitting diode connected in parallel with the collector-emitter path of a switching transistor which is biased to conduct during low-signal-level operation of the amplifier. The switching transistor is caused to switch to its non-conducting state when the amplifier is overdriven, thereby activating the light-emitting diode. Means may be provided to delay switch-back once activation of the light-emitting diode has occurred. Means may be provided to inhibit activation of the circuit by over-driving signals of limited duration.
Abstract: Contrast and color levels in a color television receiver are automatically varied with ambient light variations by an RC circuit AC coupling an ambient light responsive device to a luminance signal channel and DC coupling the ambient light responsive device to a DC potential source and a chrominance signal channel.
Abstract: An electrical circuit arrangement for filtering electrical brush noise transmitted from an open switching wire connected at one end to an intermittently used brush of a multi-speed electric motor driven by a power source and having an electrically grounded housing and stator, said circuit arrangement utilizing a switching transistor located in close proximity to said brush and motor.
Abstract: A logic circuit providing a bi-level signal, one level of which agrees with eriods of time during which the video signal corresponds to a quadrant of a first broadcast television program, said quadrant being free from horizontal and vertical synchronizing pulses present in the video signal of a second broadcast program.
March 17, 1977
Date of Patent:
April 18, 1978
Saba Schwarzwaelder Apparate-Bau-Anstalt August Schwer Soehne GmbH
Abstract: Improved bracket means for supporting a cathode ray tube in a display enclosure. The improvement resides in the formation of the seating portion of the bracket which enables the implosion-inhibiting tensioned banding surrounding the tube to make substantially constant uninterrupted contact with the periphery of the tube.
Abstract: A sinusoidal wave oscillator ballast circuit includes a tuned oscillator coupled to a DC rectifier means coupled by a power factor correction circuit to an AC potential source. The oscillator is coupled to an inductor means including a first and second transformer means with the secondary winding of the first transformer means coupled to the oscillator, the primary of the first transformer means in series connection with a capacitor and the primary winding of the second transformer means to form a resonant circuit, a first secondary winding of the second transformer means coupled to a lamp circuit to form a load circuit shunting the capacitor of the resonant circuit and a second secondary winding of the second transformer means having opposite ends connected by clamping diodes to the DC rectifier means. Means for compensating for "storage time" of the transistor of the oscillator and for conditioning the line to transients and radio frequency interference (RFI) are also provided.
Abstract: A process for fabricating cathode ray tubes having an envelope which contains an electron gun assembly and unwanted water vapor includes the steps of loading the cathode ray tube onto an exhaust machine, heating the cathode ray tube to an internal temperature greater than the condensation temperature of the water vapor during evacuation, and evacuating the water vapor from the envelope.
Abstract: A mount for a circuit breaker for mounting the circuit breaker in a holder of the type typically used for fuses and a method of making the mount is disclosed. Engaging means such as metallic screw threads or a bayonet ferrule are bonded to the envelope of the circuit breaker with one of the circuit breaker leads attached thereto. The other circuit breaker lead is attached to an eyelet. A spacer is molded between the base of the circuit breaker and the eyelet to hold the eyelet in a fixed position relative to the circuit breaker so that when the screw threads or bayonet ferrule is engaged with a holder, the eyelet contacts a contact in the base of the holder.
Abstract: A high power factor AC to DC converter circuit includes a rectifier circuit coupled to an AC potential source and providing a full-wave rectified pulsating DC potential to a switching regulator circuit with a radio frequency current filter connected in circuit with the rectifier and switching regulator circuits to provide a pulsating DC current in phase with and of at least 50% duration of said pulsating DC potential whereby a power factor of at least 90% is effected.
Abstract: A returnable shipping container includes top and bottom closure members each having inner indentations and an outer affixed metal member forming a peripheral slot with collapsible first and second body members formed to fit into the bottom and top slots and adjoining edges with aligned notches and tabs. A stabilizing insert fits into the indentations of the top and bottom closure members and the notches of the first and second body members.
Abstract: A circuit system for a television receiver, said system operating to repl a changing quadrant of the picture of a main transmitted program with an equivalent-size sector of a second transmitted program.
February 25, 1977
Date of Patent:
January 24, 1978
Saba Schwarzwaelder Apparate-Bau-Anstalt August Schwer Soehne GmbH
Abstract: A deflection yoke for a cathode ray tube includes a core of magnetic material having front and back end portions, a front crown having a substantially flat outer surface normal to the core member axis and a slotted outer circumferential surface, a back crown member having a slotted surface normal to the core member axis, and a plurality of wire turns toroidally wrapped about the core and front and back crown members with the front crown member having a single layer of wire turns and the back crown member having a first layer at wire turns extending radially and added layers of wire turns extending non-radially to the front crown member. A process for fabricating a deflection yoke includes selecting and affixing crowns to a core member and wrapping wire turns thereon to include a single front layer and multiple back layers.
Abstract: A method for making a mount for a circuit breaker for mounting the circuit breaker in a holder of the type typically used for fuses and a method of making the mount is disclosed. Engaging means such as metallic screw threads or a bayonet ferrule are bonded to the envelope of the circuit breaker with one of the circuit breaker leads attached thereto. The other circuit breaker lead is attached to an eyelet. A spacer is molded between the base of the circuit breaker and the eyelet to hold the eyelet in a fixed position relative to the circuit breaker so that when the screw threads or bayonet ferrule is engaged with a holder, the eyelet contacts a contact in the base of the holder.
Abstract: A base for a cathode ray tube includes at least one tube pin isolating means associated therewith to provide arc prevention between adjacent tube pins which can have up to a 12 KV potential difference therebetween.
Abstract: A vertical synchronizing circuit wherein a counter counts pulses at twice the horizontal deflection rate and provides a vertical output pulse at a predetermined count is shown. A synchronism or mode detector causes the circuit to switch to a driven mode when the counter is not reset in synchronism with the vertical synchronizing pulses. The mode detector causes the circuit to switch to a countdown mode when synchronism is detected. A phase detector detects phase errors between the counter and the vertical synchronizing pulses when the circuit is in the countdown mode and causes the counter to delete or add counts depending upon the direction of the phase error when such phase errors persist for a predetermined number of vertical fields. The vertical synchronizing pulses are applied to a gate which is enabled in the countdown mode when the counter reaches a predetermined count shortly before a vertical synchronizing pulse is anticipated.
Abstract: An improvement is provided in a cathode ray tube plural beam in-line electron gun assembly having applied beam currents of differing levels. At least one of the gun structures in the assembly incorporates discrete electrode modifications or differentiations whereby the respective focusing lens is dimensionally changed to effect a focused beam landing at the screen that is of a size similar to those of the beams emanating from the related guns in the assembly.