Abstract:
An envelope comprises a bowl-shaped component with a screw base and a bulb of a translucent material. A fluorescent tube bent a plurality of times and a reactance ballast are encased in the envelope. This fluorescent tube and the reactance ballast are fixed to a supporting plate. The bend part of the fluorescent tube protrudes through the supporting plate toward the side of the bowl-shaped component. A plurality of openings are formed in the bowl-shaped component at parts corresponding to the bend part of the fluorescent tube. A plurality of openings are formed in the supporting plate at parts near the reactance ballast fixed to the supporting plate.
Abstract:
A plasma display device is provided with a gas discharge device which is filled with hydrogen as an ionizable gas and contains an aluminum cathode which is maintained continuously coated during the gas discharge with a film of an aluminum oxide which is either resistant to the hydrogen gas discharge, or the non-resistant portions of which are re-formed into the oxide by means of an additive. This plasma display device can be provided for flat picture screens, particularly of television sets, because during the required life of the gas discharge device, a premature rise of the operating voltage is prevented and, at the same time, there is little sputtering effect.
Abstract:
In a method of dosing a gas discharge lamp by opening a dosing capsule by the heating action of an electromagnetic field on a metallic support, the support is in the form of a sheet metal clip embracing the capsule and having an opening through which the softened glass of the capsule is forced by the internal pressure. Breakage of the capsule is eliminated and the glass forced through the opening ensures retention of the capsule by the clip. The clip is preferably of ferromagnetic material.
Abstract:
A high intensity arc discharge lamp comprises an arc tube having tungsten electrodes at each end and containing a fill including mercury, a starting gas and a metal in the form of metal halide. The tungsten electrode also contains a small quantity of said metal in solid solution with the tungsten.
Abstract:
Fast "warm-up" of an amalgam-regulated fluorescent lamp under "cold" starting conditions and safe failure of the lamp at the end of its useful life are achieved by coating selected portions of both stems with a material that contains indium or an indium alloy and initially is semiconductive. The coating is applied to portions of the stems adjacent the electrodes and covers a segment of one or both of the lead wires at the point where they emerge from the stem presses. The coating is thus rapidly heated and releases mercury vapor as soon as the lamp is energized. When the electrodes are devoid of emission material and the lamp has reached the end of its useful life, sputtered material from the metal parts of the mount renders the coating electrically conductive and causes the arc to impinge upon and finally puncture the stem. The coating accordingly serves both as an auxiliary-amalgam source and a "fail-safe" component. Coatings of materials that are electrically conductive as soon as applied and contain an amalgamative metal can also be used, providing they do not contact both leads.
Abstract:
A low-pressure mercury vapor discharge lamp, having a discharge space containing thermally emitting electrodes and a mercury amalgam which is composed of mercury, bismuth, tin and lead.This amalgam causes the mercury vapor pressure to remain stable at the value of 6 .times. 10.sup.-3 torr which is the optimum value for the conversion of electric energy into ultraviolet radiation over a wide temperature range. In addition, the mercury vapor pressure at room temperature is still sufficiently high to ensure rapid starting.
Abstract:
The invention relates to a low-pressure sodium-vapour discharge lamp which contains an excess of sodium. According to the invention the discharge tube contains a capillary connecting duct extending from a pool of liquid sodium. The provision of the capillary connecting duct prevents the power consumption of the lamp from increasing during the life of the lamp.
Abstract:
An electric discharge lamp with an ion reservoir to which a DC voltage of reversible polarity is applied so that the gas pressure within the lamp can be easily increased or decreased. By using several ionizable materials in the lamp, the color of the emitted light can be changed by adding or removing one of said materials.
Abstract:
A xenon flash tube having a glass envelope with anode and cathode electrodes sealed in respective ends thereof. A barium dispenser is attached to each electrode, and a flashed barium deposit is located on the inside surface of each end of the envelope so as not to mask the arc discharge. The total quantity of barium in the envelope is selected to controllably reduce the radio frequency noise emitted from the flash tube during operation.
Abstract:
A high pressure Xenon short-arc lamp with two reservoirs which are selectively connectable to the lamp''s envelope is disclosed. One reservoir contains an absorbent which will absorb both Xenon and contaminant gases such as CO2 and O2. The absorbent temperature is controlled to evacuate the envelope of both the Xenon and the contaminant gases. Thereafter, the temperature of the absorbent is raised to desorb only clean Xenon while retaining the contaminant gases, thereby clearing the envelope of the contaminant gases. The second reservoir contains a gas whose specific purpose it is, by means of steps described in the disclosure, to remove the objectional metal film which deposits gradually on the interior surface of the lamp envelope during normal arc operation. The origin of this film is metal transferred from the cathode of the arc lamp by sputtering or other gas transfer processes. Since the cathodes in different lamps may, for particular purposes, be made of various metals, e.g. Tungsten, Nickel, Rhodium, Molybdenum, it is necessary to use a cleanup gas, and cleanup procedures, that are appropriate to the metal constituting the cathode surface, since it is the cathode surface material, which, transferred to the interior wall of the lamp envelope, constitutes the objectional metal film. Suitable gases and processing methods are described in the disclosure for a variety of cathode metals.