Zenith Radio Corporation

Michael W Retsky

Philip C Miller

James W Schwartz

Norman F Gioia

Alton J Torre

Ramesh G Amin

This disclosure depicts an arc-suppression means for use in cathode ray tubes having an electron gun and ancillary electrical circuits susceptible to damaging electrical arcing currents, and wherein getter means are used to capture residual gases in the evacuated envelope of the tube. The arc-suppression means is electrically resistive and is connected in an electrical path between the gun and a high voltage source, and its surface is physically exposed to a deposit of getter material when the getter is flashed. The arc-suppression means includes shadowing means for shadowing at least portions of the exposed surface from a deposit of the getter material to prevent the creation of an electrically conductive shorting path capable of permitting an arc to bypass or substantially nullify the arc-suppression means.

Electrically resistive arc suppressor shadowing getter flash

This disclosure depicts getter support means for use in television cathode ray tubes. A getter support means is structured so as to be retained in the tube by the outward, self-retaining pressure of an expansible member on the inner surface of the neck adjacent to the junction of the neck and the funnel of the tube envelope. Support for the getter assembly is provided by attachment to the expansible member.

Getter support means for television cathode ray tubes

This disclosure depicts a novel electron gun having at least one cathode having an electron emissive coating, a forward element and a plurality of electrodes interspaced between the cathode and the forward element. The electrodes and forward element each have at least one aperture wherein the apertures in the electrodes and forward element are coaxial and define at least one beam passageway for passing through the gun a stream of electrons emitted by the cathode during operation. The beam passageway unavoidably forms a conduit for high velocity gas when the gun is located in a narrow neck of a television picture tube and the tube is evacuated of gas through a tubulator located at the rear end of the neck. The improvements in the electron gun comprise a gas influencing element for reducing and perturbing the high velocity gas flow in the conduit at least in the region of the cathode as the tube is evacuated to suppress erosion of the cathode coating by preventing a violent flow of gas over the cathode.

Television picture tube with cathode coating erosion suppression

This disclosure depicts a television cathode ray tube including an evacuated glass envelope having on an external surface of a funnel portion thereof an outer conductive coating and on an internal surface thereof an inner conductive coating for receiving a high voltage charge. The tube has an electron gun located in a neck of the funnel. The tube is characterized by having an arc-suppression and static-elimination system comprising a discrete, non-distributed arc suppression resistor having a relatively low stray capacitance and having a dynamic impedance value in the range of a few kilohms to tens of megohms, and means for electrically and mechanically coupling said arc suppression resistor between said inner conductive coating and said electron gun, and in electrically parallel combination with said arc suppression resistor, an antistatic coating deposited on an inner surface of the neck around the beam egress from said gun and having a dynamic impedance value which is greater than that of said arc suppression resistor such that said resistor carries the major part of any arc currents flowing through said system, whereby effective arc suppression and static elimination are achieved with high dynamic impedance and with an insubstantial likelihood of said system being by-passed as a result of stray capacitance in the neck region of the tube.

Growing community of inventors

Chicago, IL, United States of America

Michael W Retsky