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.
Abstract:
The invention relates to fluorescent lamps with an amalgam. The disclosed fluorescent lamp with an amalgam comprises within its internal space means for housing the amalgam thereinside, one end portion of said means being positioned in the hightemperature zone of the lamp, adjacent to the cathode thereof, the opposite end portion of said means being positioned in the low-temperature zone of said lamp, adjacent to the base thereof. Said means can be adapted either for free displacement of the amalgam thereinside, when the lamp is to be mounted into a light fixture, or for retaining said amalgam in a fixed desired position thereinside.