Abstract: A cathode ray tube convergence system includes a cathode ray tube with a plurality of electron beam sources formed to provide electron beams which are underconverged inside of and converged outside of the screen of the tube and a deflection yoke associated with the cathode ray tube and having horizontal deflection windings effecting convergence at the outer ends of the horizontal axis of the cathode ray tube screen.

Abstract: A base for a cathode ray tube includes at least one tube pin isolating means formed within the rim of the base to provide arc prevention between adjacent tube pins which can have up to a 12 KV potential difference therebetween. The isolating means comprises a cutout portion in the rim and an electrically insulating plug to fit therein.

Abstract: A base for a cathode ray tube includes a rubber washer having apertures of a size to fix over the glass nubbins surrounding the bottom of the tube pins where they exit from the neck of the tube. The base also includes a walled rim which contains the washer.

Abstract: A process for fabricating lenses for use in manufacturing cathode ray tube screen structure wherein a matrix of data points is selected on the viewing screen of the cathode ray tube and a light source is positionally located at each of the data points by optical scanning exposure apparatus. The location information for each of the data points is recorded and a cathode ray tube is constructed having the screen structure fabricated in accordance with the recorded light source location information. Error between the light source location information and electron beam landing of the cathode ray tube is measured and the error measurements are utilized to correct the light source location information which is then submitted to a lens design program to furnish lens manufacturing information.

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 constructions in the assembly incorporates discrete electrode structural modifications 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.

Abstract: An improved CRT beam adjustment device is provided for exterior orientation on the neck of the tube. The device includes a plurality of rotatably adjustable annulate magnetic members sequentially positioned on a support sleeve, one end thereof being formed to have a plurality of tongue-like extensions, each having a terminal protuberance extending radially outward therefrom. Each protuberance has a surface facing the annulate member that is downward sloping toward the body of the sleeve. An adjustable ring clamp is positioned to ride on the slanted surface of the protuberance and abut the adjacent magnetic members, thereby providing by one adjustment, pressure to positionally lock the adjusted members while simultaneously affixing the device to the neck of the tube.

Abstract: A cathode ray tube plural-beam-in-line bi-potential electron gun assembly, having applied beam currents of differing levels, manifests structurally modified gun structures to effect focused beam landings at the screen that are evidenced as substantially equi-sized spots thereby providing improved resolution and brightness of the screen imagery. The structural changes embody modifications of the related focusing and accelerator electrodes of the respective guns to provide a partial telescoping arrangement for effecting the discrete placement, forming and shielding of the final focusing lenses. The three lenses so formed are in different planes in partial overlapping axial relationship.

Abstract: A tuning voltage circuit for providing a tuning voltage which is corrected by an automatic frequency control error voltage for application to a voltage controlled radio frequency tuning means for a television receiver is shown. The voltage controlled radio frequency tuning means has a non-linear frequency versus tuning voltage characteristic which causes the sensitivity of the tuning means to the error voltage to vary over the frequency range of interest. The tuning voltage circuit includes a high impedance tuning voltage source which provides sensitivity compensation for the automatic frequency control error voltage to compensate for variations of the automatic frequency control pull-in range in the frequency range of interest.

Abstract: A high efficiency linear amplifier which operates in a class AB mode so long as the output potential is less than a first potential source and switches to a second potential source and output electron device when the output potential exceeds the magnitude of the first potential source.

Abstract: An equipment housing for a communication system such as a community antenna television system wherein signals are coupled via a coaxial cable is shown. The coaxial cable can be attached to alternative ports of the equipment housing. A connector with first and second intersecting bores is retained in the housing in a position to receive the center conductor of the coaxial cable through either of the first and second ports. A threaded set-screw inserted in a third bore of the connector secures the center conductor in either of the first and second bores. A third port in the equipment housing provides access to the set-screw.

Abstract: A vertical synchronizing circuit wherein noise pulses or signals which may accompany vertical synchronizing pulses are locked out for a predetermined time subsequent to the receipt of a vertical synchronizing pulse is shown. A counter counts pulses at the horizontal or line deflection rate. At a particular count of the counter the vertical synchronizing circuit is conditioned for receipt of a vertical synchronizing pulse. Subsequent to the receipt of a vertical synchronizing pulse, the vertical synchronizing circuit is conditioned to be unresponsive to any received pulses until the counter again counts to the predetermined count.

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: The invention provides conjunctive apparatus for facilitating the fabrication of the basic pattern windowed-web portion of a color cathode ray tube screen structure formed in the viewing area of the face panel. In accordance with the invention, additional photo-exposure of the panel is discretely effected by the apparatus to polymerize a defined band of coating confined to the sidewall portion of the panel. The presence of this band subsequently facilitates expeditious removal of extraneous graphite coating from the panel sidewall, from the mask positioning studs embedded therein, and from the terminal sealing edge therearound. Thus, the apparatus of the invention provides desirably bare sidewall-associated surfaces that are free of deleterious particulate matter.

Abstract: A signal receiver having a source of video signals includes an aperture correction system wherein an electron device coupled to the video signal source provides first and second oppositely-phased output signals which are applied to a circuit means to be differentiated and delayed respectively and applied to a summing terminal with desired preshoot and overshoot characteristics. Moreover, these characteristics are selectable by an adjustable impedance coupled to the circuit means providing the differentiated and delayed signals.

Abstract: A cathode ray tube raster in a television receiver is blanked for selected channels chosen to receive audio information by a bias circuit coupled to a video signal source connected to a cathode ray tube wherein the bias circuit provides a given bias potential to the cathode ray tube when a modulated picture carrier signal is detected and a different bias potential blanking the raster of the cathode ray tube when an unmodulated picture carrier signal is detected.

Abstract: An improvement is provided in a cathode ray tube screen exposure device to achieve optimum optical alignment of related components constituting the exposure optical system. In relationship with a discretely positioned light output area, separate means are provided to achieve fine adjustable positionings of both the source of radiant energy and the associated reflective means in both x and y related directions in planes normal to the optical axis, and in the z related direction in planes parallel to a central axis. Each of the respective optical alignment adjustments is individually effected by linkages to separate exteriorly located control means. Retentive means are incorporated in the respective linkages to insure accurate maintenance of the cooperative adjustments.

Abstract: An improved single cavity packaging enclosure is provided for supporting and protecting an individual cathode ray tube. The enclosure is fabricated from a unitary sheet of foldable substantially rigid material and contains integral supportive structures, wherein discrete lip configurations effect beneficial positional retention of formed tube-supporting therein.

Abstract: Side pin-cushion distortion in the display system of a television receiver is corrected by circuitry which includes an "E" core saturable reactor having equal air gaps in a pair of outer legs and an ungapped center leg with a control winding fed by a vertical scan signal source affixed to the central leg and impedance windings fed by a horizontal scan signal source affixed to the outer legs whereby the inductance level of the outer legs is reduced while the change in inductance due to current changes in the control winding remains substantially constant.

Abstract: A composite article comprises a core of a phosphor particle having a light modifying layer thereon. The light modifying layer is comprised of a co-precipitated mixture of a free-flowing agent such as silica or pyrophosphate and a pigment which modifies the light output of the energized phosphor. Also disclosed is a method of making the composite article which comprises the steps of preparing an aqueous mixture of particles of phosphor, particles of a pigment and a positively charged colloidal silica or pyrophosphate and mixing thoroughly. After mixing, a base, in the case of silica, or a salt which will form an insoluble pyrophosphate in the case of the pyrophosphate, is added thereto in sufficient amount to gel the mixture causing the silica or pyrophosphate and the pigment to co-precipitate upon and coat the phosphor particles. After the coating operation the supernatant liquid is removed and the coated phosphor is dried.

Abstract: In a cathode ray tube display system having a horizontal deflection circuit which includes a horizontal deflection yoke and an "S" curve correction charge storage means, a dynamic damper circuit shunts the "S" correction charge storage means and includes a series connected charge storage means and a unidirectional conduction device shunted by an impedance whereby the dynamic damper circuit compensates for variations in potential at the "S" curve correction charge storage means due to intermittent load changes.