Abstract:
A fluorescent lamp has increased weight of emission mix material on the metal coils forming the electrodes. The coating layer of emission mix material includes in the range of 70 weight % to 85 weight % alkaline earth carbonate content. The coating layer of emission mix material has a particle size distribution by volume with two maxima, and one of the maxima is at a particle size that is no more than half and up to one tenth smaller than of the particle size of the other maximum. The smaller of the two maxima constitutes 10 weight % to 40 weight % of the alkaline earth carbonates in the coating layer of emission mix material. A method for making fluorescent lamp includes the step of installing at least one electrode coated with an emission mix material including more than 70 weight % alkaline earth carbonate content.
Abstract:
An electrode for a discharge lamp is provided with a mayenite compound in at least a part of the electrode that emits secondary electrons, and a surface of a surface layer of the mayenite compound is plasma treated.
Abstract:
The invention relates to an electron emission material for use in fluorescent lamps that releases a significantly reduced amount of decomposition material, predominantly CO2, during in-lamp heat-treatment. Consequently, there is a significant reduction in the amount of electrode decomposition-related contaminants in the lamp. In addition, the emission material of the invention requires a much lower temperature in-lamp heat-treatment during manufacturing than that of conventional lamps of the same type. The invention, while described herein for use primarily with fluorescent lamps, has broader application to any device where the primary means of electron emission is of the thermionic type.
Abstract:
It is possible to enhance the luminance of a cold-cathode type discharge lamp and to contribute to a prolongation of service life thereof. A discharge lamp 1 is provided with an electrode 3 having a cup 4 with such a shape that a bottom is provided at each of both opposed ends of the glass tube 2. The cup 4 is connected to a lead-in wire 8 which is inserted through the end of the glass tube 2 and held thereby. The collision-preventing ring 5 covering an end surface of the cup 4 is provided to the open end 4a of the cup 4. The porous tungsten disk 6 impregnated with a ternary metal oxide composed of barium (Ba), aluminum (Al), and calcium (Ca) as an electron emission material is provided at a bottom in an inside of the cup 4.
Abstract:
A cold cathode fluorescent tube where an electron emitting electrode is sealed in shows much deterioration in the luminance with time, thereby being not adequate for a long time use. The electrode emitting electrode is formed in such a shape that an electric field is not locally concentrated. By mixing a material of high heat conductivity, such as tungsten, as the material for the electron emitting electrode or using helium of high heat conductivity as the sealing gas, a long life of the cold cathode fluorescent tube is achieved.
Abstract:
It is possible to enhance the luminance of a cold-cathode type discharge lamp and to contribute to a prolongation of service life thereof. A discharge lamp 1 is provided with an electrode 3 having a cup 4 with such a shape that a bottom is provided at each of both opposed ends of the glass tube 2. The cup 4 is connected to a lead-in wire 8 which is inserted through the end of the glass tube 2 and held thereby. The collision-preventing ring 5 covering an end surface of the cup 4 is provided to the open end 4a of the cup 4. The porous tungsten disk 6 impregnated with a ternary metal oxide composed of barium (Ba), aluminum (Al), and calcium (Ca) as an electron emission material is provided at a bottom in an inside of the cup 4.
Abstract:
An electron emissive composition comprises a barium tantalate composition of the formula (Ba1-x, Cax, Srp, Dq)6(Ta1-y, Wy, Et, Fu, Gv, Caw)2O(11nullnull) where null is an amount of about 0 to about null3; and wherein D is either an alkali earth metal ion or an alkaline earth ion; E, F, and G, are alkaline earth ions and/or transition metal ion; x is an amount of up to about 0.7; y is an amount of up to about 1; p and q are amounts of up to about 0.3; and t is an amount of about 0.05 to about 0.10, u is an amount of up to about 0.5, v is an amount of up to about 0.5 and w is an amount of up to about 0.25. A method for manufacturing an electron emissive composition comprises blending a barium tantalate composition with a binder; and sintering the barium tantalate composition with the binder at a temperature of about 1000null C. to about 1700null C.