Abstract:
There is presented a cold cathode subminiature fluorescent lamp comprising a glass envelope, a pair of lead wires sealed to the envelope and extending through the envelope at an entry location to the interior thereof, an electrode mounted on the lead wires in the envelope, and a ceramic-glass bead formed on and around the lead wires in the envelope between the electrode and the entry location. The electrode includes a plurality of metal wire tabs. The envelope contains a fill gas comprising neon and argon.
Abstract:
A fluorescent low pressure discharge lamp is provided with axially mounted cold-cathode electrodes consisting of a sintered shaped mixture of inorganic material including about 50-90% by weight of tungsten and the remainder BaO or a mixture of BaO, CaO and SrO and oxides of Y, Zr or Hf or the rare earths. The electrodes have a uniform density throughout with a porosity of less than 10%.
Abstract:
A high-frequency fluorescent lamp (10) that is energized by an electronic high-frequency ballast (50). The two ends of the lamp are hermetically sealed by a set of base assemblies (14). Each assembly consists of an end cap (16) and a non-thermionic, high-frequency radiating element (18) that includes an integral input power pin (20). The radiating elements function as cathode/antennas that operate within a pressurized noble gas environment without the need for mercury. Since there is no mercury to vaporize nor any thermionic emission, the lamps, upon the application of power, start immediately to emit a high-frequency signal. This signal directly bombards and excites the lamps phosphor coating which causes the phosphor to fluoresce and emit visible light.
Abstract:
A fluorescent lamp includes a bulb defining a discharge channel, and a pair of discharge electrodes provided at both ends of the bulb. Each electrode has a pair of leads, a filament mounted between the leads, and rod-like auxiliary electrodes protruding from the leads, respectively. Each auxiliary electrode extends beyond the filament in the electron discharge direction of the discharge electrodes. Each auxiliary electrode is constructed so as to satisfy the following equation Q/I.sub.L .gtoreq.1.0.times.10.sup.-2, where Q is heat capacity of the auxiliary electrode and I.sub.L is lamp current.
Abstract:
An electric discharge tube comprising wire probes located close to the electrodes for collecting electrons, and bimetallic support for each wire probe to vary in response to operative temperature, the distance of the wire probe from the electrode.
Abstract:
A carbon coating is provided on the filament end regions, and also on the adjacent support wires and anodes, of an electrode structure for a low pressure mercury vapor discharge lamp, such as a fluorescent lamp. This results in improved lamp efficiency and reduced oxide ring formation at the lamp ends.
Abstract:
A fluorescent lamp in which the inleads or clamps of the electrodes are coated with a high temperature plastic containing a filler of an insulating inorganic material. The plastic is not removed by baking but remains in place in the completed lamp. One suitable material consists of an aromatic polyimide wherein the filler is zirconium oxide. The coating eliminates or lessens light-absorbing oxide rings and brown patches which form on the envelope ends as a result of the arc taking off from the inleads instead of from the electrode coil, a condition to which instant start lamps are particularly prone.