Abstract:
An improved cathode structure for high current, low pressure electric discharge devices is described as comprising an oxide emissive mix coated filament mounted axially within a hollow open-ended refractory metal cylinder. Unusually high discharge currents on the order of 2 to 50 amperes are provided with this electrode structure for long periods of time.
Abstract:
A hollow cathode lamp for atomic light absorption analysis which includes a hollow cathode fabricated by mixing and compressing the powder of Cd3Cu with at least one of the powders of Pb3Ba, Pb3Ca and Pb3Sr in a predetermined volume ratio into a hollow cathode shape.
Abstract:
A thermionically emitting hollow cathode for very high currents up to 400 amperes AC particularly suitable for xenon-filled wallstabilized lamps. It comprises a hollow cylindrical body of porous tungsten, open in the direction of the arc and having a coil of tungsten wire lining the cavity walls except for a region at the rear deep within the cavity. The cavity wall but not the face nor the outside of the electrode are impregnated with emission material, suitably barium thorate. The cooler shank end of the cavity in which the electrode coil does not extend serves as a dead space into which gas can expand during the AC cycle, thereby reducing the rate of gas flow in and out of the open end.
Abstract:
In a lamp used as light source for atomic light absorption analysis, comprising a cathode having a hollow therein, an anode disposed in the vicinity thereof, a hermetical envelope to enclose the cathode and the anode, and gaseous atmosphere contained in envelope, the cathode is formed of an alloy composed of silver and at least one metal having a melting point equal to or lower than 500*C and emitting the same spectral line as the metal to be analyzed so that the cathode is prevented from being deformed and the luminous intensity and the analytic accuracy are improved.
Abstract:
A gas discharge display/storage apparatus in which a multicolor display is achieved utilizing an arrangement of the triad cell configuration. The triad cell configuration may be positioned on a transparent filter sheet or may be represented by polychromatic phosphor cells formed on the inner surface of the gas discharge display storage apparatus. The triad arrangement representing basic colors of red, blue and green is addressed by horizontal conductors which thread through each of the three cells in the triad arrangement, while the vertical conductors are arrayed in groups of three, each conductor threading the cells of a specific color. The panel can thereby be constructed substantially as a conventional black and white plasma display device, and conventional addressing techniques may be utilized to provide a plasma display with multicolor capability.
Abstract:
A multi-position character display panel includes a gas-filled envelope which contains a plurality of groups of cathode segments arrayed in a line of character positions, with a single anode electrode provided for all of the groups of segments. In each group of cathode segments, the segments are long, narrow, rectangular members arrayed in a figure ''''8'''' pattern. In addition, a group of transfer cathodes is disposed adjacent to the lower edge of each figure 8 pattern and between each such pattern for use in transferring cathode glow through each group of cathode segments and from each group of cathode segments to the next group of cathode segments. The panel is operated by energizing the anode and the first of the transfer cathodes associated with the first group of cathode segments, then energizing each of the cathode segments for the character to be displayed in the first character position as determined by the input information, then transferring back to the first transfer electrode, then to the second transfer electrode and the associated decimal point, if required, then to the third transfer electrode, and then to the first transfer electrode of the next group of cathode segments. The same cycle is repeated for the second character position and the others in the series of character positions.
Abstract:
An injection-triggered xenon flash tube having an elongated glass envelope with anode and cathode electrodes sealed in the ends thereof. The cathode comprises a pressed and sintered pellet of powdered tantalum and barium aluminate with a 100 percent pitched tungsten coil wound about the cylindrical sidewall of the pellet.
Abstract:
A gas-filled display panel includes a top plate, a bottom plate, an apertured center plate, and a plurality of arrays of electrodes associated therewith. The bottom plate is provided with slots for receiving an array of scanning anode electrodes; an array of scanning cathode electrodes is disposed between the bottom plate and the center plate, and an array of display anode electrodes is disposed between the center plate and the top plate. The electrodes and plates are interrelated to provide upper and lower layers of gas-filled cells. The cathode electrodes comprise metal strips which are elongated and have an array of apertures disposed along their lengths, each aperture providing communication between a cell in the lower layer and a cell in the upper layer. The cathode strips are of sufficient thickness to provide strength and rigidity except for a thinner central portion which extends along, and is aligned with, the array of apertures therein whereby the apertures are of minimum depth.