Abstract:
A method for producing an electrode (16) for a high-pressure discharge lamp (10), comprising the following steps: a) scanning at least part of the electrode surface for producing an oxide layer (step 120); b) at least partially sublimating the oxide layer formed in step a) (step 120); and c) reducing the rest of the oxide layer.
Abstract:
A method for producing an electrode (16) for a high-pressure discharge lamp (10), comprising the following steps: a) scanning at least part of the electrode surface for producing an oxide layer (step 120); b) at least partially sublimating the oxide layer formed in step a) (step 120); and c) reducing the rest of the oxide layer.
Abstract:
The disclosed embodiments include embodiments such as an X-ray tube cathode filament system. The X-ray tube cathode filament system includes a substrate and a coating disposed on the substrate. In this cathode filament system, an electron beam is emitted from the coating but not from the substrate. The electron beam is produced through the use of the thermionic effect.
Abstract:
A width of a groove of a cathode holder and a thickness of a cathode conductor are determined so that a dimension which is obtained by subtracting the thickness from the width is equal to a gap length which has a predetermined length, and which is between a filament and a cathode. Then, the cathode holder is rearward pushed to cause a front end face of the groove 26 to butt against the cathode conductor, and the cathode conductor and filament conductors are coupled and fixed to each other via an electrically insulating material. And then, the filament is forward moved to butt against the cathode, and the filament is fixed to the filament conductors. After that, the cathode holder is forward pulled to cause a projection to butt against the cathode conductor, and the cathode holder is fixed to the cathode conductor.
Abstract:
An indirectly heated cathode includes a cathode sleeve (2) housing a heater (1), a caplike base (3) attached onto the cathode sleeve (2), and an electron emitter layer (4) formed on a surface of the base (3). The cathode sleeve (2) is made of a metal material that contains nickel and chromium as main components and further contains at least silicon, aluminum, cerium, and lanthanum. According to this construction, the cathode sleeve (2) is kept from heat deformation. Hence a reliable indirectly heated cathode which suppresses variations in cutoff voltage can be realized.
Abstract:
A vacuum tube, in particular a cathode ray tube, equipped with at least one oxide cathode comprising a cathode carrier with a cathode base of a cathode metal and a cathode body with a cathode coating of an electron-emitting material that comprises an alkaline earth oxide, selected from the group formed by the oxides of calcium, strontium and 5 barium, and a sintering inhibitor.
Abstract:
A cathode for an electron tube and a method of preparing the same are provided. The cathode includes a base metal and an electron emissive material layer attached to the base metal. A surface roughness, which is measured from the distance between a highest point and a lowest point of the surface of the electron emissive material layer, is controlled to be no greater than 8 μm. By controlling the sizes of particles and pores constituting the electron emissive material layer to be uniform and controlling the density and porosity of the electron emissive material layer, the cathode is improved in compactness and surface evenness compared to a cathode prepared according to a spraying method. Accordingly, shrinking of the cathode during operation can be prevented, and the distance between the cathode and a G1 (first grid) electrode can be maintained uniform, so that the life of the cathode can be greatly extended, and a stable electron emission characteristic can be realized.
Abstract:
The present invention relates to an internally heated cathode. More specifically, the internally heated cathode that comprises an a cavity structure, where at least a portion of the cavity structure forms an emission material portion, the cavity structure defining a cavity, and a heater disposed within the cavity, providing for an efficient, durable, and long lasting cathode that requires less power.
Abstract:
An indirectly heated button cathode for use in the ion source of an ion implanter has a button member formed of a slug piece mounted in a collar piece. The slug piece is thermally insulated from the collar piece to enable it to operate at a higher temperature so that electron emission is enhanced and concentrated over the surface of the slug piece. The slug piece and collar piece can be both of tungsten. Instead the slug piece may be of tantalum to provide a lower thermionic work function. The resultant concentrated plasma in the ion source is effective to enhance the production of higher charge state ions, particularly P+++ for subsequent acceleration for high energy implantation.
Abstract:
The present invention relates to a cathode ray structure for a cathode ray tube, and more particularly, to a cathode structure for a cathode ray tube capable of maximizing thermal efficiency and minimizing power consumption.