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    • 5. 发明授权
    • X-ray tube with ferrite core filament transformer
    • 带铁氧体磁芯变压器的X射线管
    • US5291538A
    • 1994-03-01
    • US72400
    • 1993-06-03
    • James E. BurkeLester MillerSalvatore G. Perno
    • James E. BurkeLester MillerSalvatore G. Perno
    • H01J35/26H01J35/06H01J35/10H01J35/24H05G1/06H05G1/08H05G1/34H01J35/04
    • H05G1/34H01J35/06H01J35/10H01J35/24H05G1/06H05G1/08H01J2235/162
    • An evacuated envelope (C) which is connected with an anode (A), has a cathode assembly (B) rotatably mounted inside. Magnets (44, 46) hold the cathode assembly stationary as the anode and envelope rotate. A ferrite core transformer (60) includes a ferrite core primary (66) stationarily mounted exterior to the envelope. A secondary (64) is mounted to the cathode assembly interior to the envelope. The secondary winding includes a ferrite core (70), a portion of which is surrounded by a ceramic, dielectric bobbin (76). The bobbin includes walls or ridges (78) which define a spiral groove (80) therearound in which an uninsulated electric wire (82) is received. The uninsulated electric wire is connected with a cathode filament (52). The primary winding has a ferrite core (90) that has about five times the cross section as the secondary ferrite core to compensate for a low, about 20%, coupling efficiency between the primary and secondary windings. Preferably, the primary winding core tapers (94) adjacent its pole faces to focus magnetic flux toward pole faces (72, 74) of the secondary ferrite core.
    • 与阳极(A)连接的真空外壳(C)具有可旋转地安装在内部的阴极组件(B)。 当阳极和外壳旋转时,磁体(44,46)将阴极组件固定住。 铁氧体磁芯变压器(60)包括固定在信封外部的铁氧体磁芯初级(66)。 次级(64)安装到阴极组件内部的信封。 次级绕组包括铁氧体磁芯(70),其一部分被陶瓷介质绕组(76)包围。 线轴包括限定在其周围的螺旋槽(80)的壁或脊(78),其中接收未绝缘的电线(82)。 非绝缘电线与阴极灯丝(52)连接。 初级绕组具有铁氧体磁芯(90),其具有作为次级铁氧体磁心的约5倍的横截面以补偿初级和次级绕组之间的低约20%的耦合效率。 优选地,初级绕组芯在其极面附近逐渐变细(94),以将磁通聚焦到次级铁氧体磁芯的极面(72,74)。
    • 6. 发明授权
    • Ring tube x-ray source
    • 环管x射线源
    • US5268955A
    • 1993-12-07
    • US862805
    • 1992-04-08
    • James E. BurkeLester Miller
    • James E. BurkeLester Miller
    • H01J35/06H01J35/16H01J35/24H01J35/26H05G1/08H05G1/20H05G1/34H05G1/52H05G1/66H01J35/04
    • H01J35/045H01J35/06H01J35/165H01J35/24H05G1/025H05G1/08H05G1/20H05G1/34H05G1/52H05G1/66H01J2235/162
    • A toroidal x-ray tube housing (A) has an evacuated interior. An annular anode (B) is connected with the housing closely adjacent the window such that a cooling fluid passage (12) is defined in intimate thermal communication with the anode. A cathode assembly (32) is mounted within the evacuated housing or an annular ring (30) that rotates an electron beam (22) around the large diameter annular anode. In the embodiment of FIGS. 1 and 2, the annular ring is magnetically levitated (40) and rotated by a motor (50). A collimator (62) and filter (64) are rotated with the cathode assembly closely adjacent an electron emitter or cathode cup (32) such that the generated x-rays are collimated and filtered within the x-ray tube. Preferably, a plurality of cathode cups (120) are provided, whose operation is selected by a series of magnetically controlled switches (76). The cathode cup is insulated (106) from the annular ring and isolated by a transformer (104, 112) from the filament current control switches. In the embodiment of FIGS. 4-6, the cathode assembly (C) includes a multiplicity of stationarily mounted electron cups (120) which are selectively actuated to rotate the electrode beam by a switch (130). An electron beam scan control (134) may bias the potential applied to grids (124, 126) to scan the electron beam generated by electron emitter over a commensurate arc length of the anode with the arc length of the emitter. In the embodiment of FIG. 7 , multiple anode surface as well as multiple cathode cups are provided.
    • 环形X射线管外壳(A)具有抽真空的内部。 环形阳极(B)与壳体紧邻窗口连接,使得冷却流体通道(12)被定义成与阳极紧密热连通。 阴极组件(32)安装在抽真空壳体内,或环形环(30),其围绕大直径环形阳极旋转电子束(22)。 在图1和图2的实施例中 如图1和图2所示,环形环被磁悬浮(40)并由电动机(50)旋转。 准直器(62)和过滤器(64)随着阴极组件靠近电子发射器或阴极杯(32)而旋转,使得所产生的x射线在x射线管内被准直和过滤。 优选地,提供多个阴极杯(120),其操作由一系列磁控开关(76)选择。 阴极杯与环形环绝缘(106),并与灯丝电流控制开关的变压器(104,112)隔离。 在图1和图2的实施例中 如图4-6所示,阴极组件(C)包括多个固定安装的电子杯(120),其被选择性地致动以通过开关(130)旋转电极束。 电子束扫描控制(134)可以偏置施加到栅极(124,126)上的电位,以扫描由电子发射器产生的与发射极的电弧长度相当的阳极长度的电子束。 在图1的实施例中 如图7所示,提供多个阳极表面以及多个阴极杯。