Abstract:
A sintering type cathode (C1) has a shell−shaped cathode tip end portion (35) consisting of a conical peak portion (31) provided on one edge side facing an anode and a cylindrical base portion (33) provided on the other edge side. The cathode tip end portion (35) forms an electron radiation portion for emitting electrons. The cathode tip end portion (35) contains a particle−form high−melting−point metal (41), an aluminum layer (43) covering at least part of the surface of the high−melting−point metal (41), and a metal oxide (45) as an easily electron−emitting substance. This cathode tip end portion (35) is formed by mixing into the aluminum layer (43)−coated metal (41) a compound (metal carbonate) containing a metal serving as easily electron−emitting substance and changed into a metal oxide (45) on heat treating, and sintering the mixture.
Abstract:
An impregnated cathode structure and a method of manufacturing the structure capable of firmly connecting a porous base metal to a cup body without using an intervenient and increasing the reliability of welding between the porous base metal and the cup body and an yield by eliminating the occurrence of defective welding; the impregnated cathode structure, comprising the porous base metal (11) impregnated with emissive materials and the cup body (12) allowing the surface of the porous base metal (11) to expose and holding the porous base metal (11) so as to cover the bottom and side faces thereof, wherein a non-porous dense part (14) is formed at the bottom face of the porous base metal (11), a close-fitted area (16) is formed by pressingly deforming the bottom part of the cup body (12) along the shape of the dense part (14), and the bottom part of the cup body (12) is welded to the dense part (14) of the porous base metal (11) in the close-fitted area (16).
Abstract:
A electron emission cathode includes an emitter (102) having an apex (118) from which electrons are emitted. The emitter is attached to a heating filament (114) at a junction (116) and extends from the junction both forward toward the apex and rearward. A reservoir (130) of material that lowers the work function of the emitter is positioned on the rearward extending portion (128) of the emitter. By positioning the reservoir on the rearward extending portion, the reservoir can be positioned sufficiently far from the junction to reduce its temperature and thereby greatly increase the useful life of the emitter without adversely affecting the emission characteristics of the source.
Abstract:
An impregnated cathode structure using an impregnated cathode substrate which includes a large grain size, low porosity region and a small grain size, high porosity region disposed on the side of an electron emission surface of the large grain size, low porosity region, having a mean grain size smaller than a mean grain size in the large grain size, low porosity region and having a porosity greater than the porosity in the large grain size, low porosity region, and which is impregnated with an electron emission material.
Abstract in simplified Chinese:本发明关于一种阴极配置,其包含:一阴极本体,其容纳一发射表面,用以在一纵向方向(Z)中发射电子,其中,该发射表面由一发射周围界定;一聚焦电极,其在一横向方向中至少部分封闭该阴极本体,并且包含一电子透射孔径,用以聚焦由该发射表面所发射的电子,其中,该孔径由一孔径周围界定,其中,该阴极本体以可移动的方式在与一对齐位置相隔一最大横向距离的上方被排列在该聚焦电极里面,且其中,该孔径周围横向延伸在该发射表面上方并且在超过该最大横向距离的重叠距离上方超越该发射周围。
Abstract:
A 4G magnetron is disclosed. The magnetron may include an anode, having a cylindrical member and anode vanes disposed within the cylindrical member which define resonant cavities therebetween, and a dispenser cathode, suitable for heating and located coaxially within said anode. The magnetron may operate in a temperature range of about 850-1050 C. The magnetron may include conductive cooling. The magnetron may comprise inventive anode and cathode structures. A method for preparing a plurality of magnetron tubes substantially simultaneously is further provided.
Abstract:
A low power impregnated cathode consisting of a pallet, a cup, an inner sleeve, a tap, and an outer sleeve, is characterized in that the diameter of the pellet is less than at least one and half times of the thickness of the pellet, and is characterized in that an outer diameter of the bottom part of the outer sleeve is larger than an outer diameter of the top part thereof.