Abstract: The light output and lumen maintenance of fluorescent lamps with or without a conductive film, are improved by coating the glass envelope or the conductive glass envelope with a thin transparent film of Al.sub.2 O.sub.3.The alumina film is obtained from a coating of a binderless suspension of submicron size Al.sub.2 O.sub.3 particles in lightly acidified water and has a thickness of 20 to 80 nanometers.
Abstract: A low-pressure mercury vapor discharge lamp having an internal transmissive starting strip with two separate parts. The separation between the parts is bridged by a narrow straight or helix-shaped conductive connecting strip to bring the total resistance of the starting strip to a value between 50,000 and 150,000 ohms.
September 6, 1977
Date of Patent:
December 12, 1978
U.S. Philips Corporation
Louis E. Vrenken, Franciscus M. P. Oostvogels, Rein W. VAN DER Wolf
Abstract: An energy saving fluorescent lamp utilizing a krypton-neon fill gas mixture and shielded electrode structures having a getter material thereon to operate at a reduced power consumption while serving as a direct replacement for another lamp, consuming a larger amount of energy, with the same ballast transformer. The getter material improves the starting characteristics of the lamps.
Abstract: An energy saving fluorescent lamp utilizing a krypton-neon fill gas mixture and shielded electrode structures to operate at a reduced power consumption while serving as a direct replacement for another lamp, consuming a larger amount of energy, with the same ballast transformer.
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 fluorescent lamp has a transparent electrically conductive coating on the inner surface of the fluorescent lamp bulb. A transparent protective coating of finely powdered aluminum oxide is disposed on the conductive coating.
Abstract: A fluorescent lamp has a transparent electrically conductive indium oxide coating on the inner surface of the fluorescent lamp bulb. A transparent coating of finely powdered titania is disposed on the conductive coating to improve its conductivity and a transparent protective coating of finely powdered aluminum oxide is then disposed on the titania coating.
Abstract: Low frequency noise in a gas laser is suppressed by providing an auxiliary cathode in proximity to the anode to provide an auxiliary gas discharge between these elements. The anode and another cathode provide a primary gas discharge for lasing operation.
Abstract: An indium oxide coating is used on the inside surface of a vapor electric discharge lamp, such as a fluorescent lamp, to reduce the starting voltage. The coating is especially effective at low temperatures, but also reduces the voltage even at room temperatures. It is particularly useful also in lamps using certain mixed inert gases with the mercury, since the mixtures used generally require a higher starting voltage than the ordinary fluorescent lamps containing argon and mercury vapor.