Abstract: A direct-heated flat emitter for generating a homogenous electron beam, particularly for x-ray tubes, has two terminal lugs for the heating current supply formed at the edge of the perimeter of the emission surface and the emission surface is subdivided into interconnects by slits. The slits have a width no less than 10 .mu.m and no greater than 1% of the length of a diagonal of the smallest rectangle which can circumscribe the emission surface.

Abstract: An x-ray radiator has a rotating bulb tube whose vacuum housing rotates within the radiator housing filled with a fluid coolant, as well as with an external heat exchanger for the cooling of the coolant, with the coolant admission connector and the coolant discharge connector for the coolant conducted through the external heat exchanger without a circulating pump arranged at respective positions of the radiator housing at which a lower pressure and a higher pressure are generated by the rotation of the rotating bulb.

Abstract: An x-ray computed tomography apparatus with electronic scanning of a ring-shaped anode has a solenoid coil for space-charge compensation which allows access to the anode. The solenoid coil is constructed of multiple parts so that a connector part can be released from a base part and the anode is thereby made accessible.

Abstract: A radiation source for generating multi-chromatic, particularly di-chromatic, x-radiation has at least one cathode and an anode for generating x-ray bremsstrahlung and a target surrounded by the cathode for converting the x-ray bremsstrahlung incident on the target into fluorescence radiation. The target is composed of different materials in sections and the sections can be selectively irradiated with the x-ray bremsstrahlung.

Abstract: An x-ray tube has an evacuated housing rotatable around a rotational axis with a cathode and an anode being rigidly mounted in the housing so as to rotate therewith. The cathode emits electrons which are accelerated with an electrical field so as to strike the anode. An electromagnetic system for deflecting and focusing the electron beam has a number of current-permeated coil elements, whereby the coil elements are arranged a common carrier that at least partially surrounds the housing.

Abstract: In an x-ray computed tomography apparatus the source of X-rays and the detector are able to scan a volume of the examination subject in a short time. The X-ray source contains an anode that is elongated in the z-direction, on which the focus travels by a controlled deflection of an electron beam. A primary beam diaphragm is displaced synchronously with the focus movement along the anode. The diaphragm forms a pyramid-shaped X-ray beam which always fully strikes the detector but does not overshot the detector. The detector is formed by a matrix of detector elements.

Abstract: An x-ray tube with vario-focus has an evacuated housing in which are arranged, rigidly connected thereto, an electron-emitting cathode and an anode dish which is struck by the electron beam, accelerated with an electrical field. An electromagnetic system for deflecting and focusing the electron beam is provided, and has a number of current-permeated coil elements. A lateral x-ray beam exit window is provided in the housing for the x-rays, which emerge at substantially a right angle relative to the longitudinal middle axis. The x-rays are picked up by an image receiver following a subject table. At least the anode dish is tiltable relative to the connecting axis to the image receiver, and the electromagnetic system at least partially surrounds a cathode-side neck section of the housing, and generates a quadrupole field for modifying the electron beam cross-section, corresponding to the tilt angle.

Abstract: An X-ray tube having a vacuum housing rotatable around a rotational axis, a ring-shaped anode connected to the vacuum housing whose center axis corresponds to the rotational axis, a cathode arranged inside the vacuum housing and that surrounds the rotational axis and that emits electrons radially outward during operation of the X-ray tube, a rotatable support for the vacuum housing, a drive arrangement for turning the vacuum housing and an arrangement for focussing the electron beam proceeding from the cathode to the anode which focus the electron beam such that it strikes the anode in a stationary focal spot.

Abstract: An x-ray tube has an evacuated housing in which an electron-emitting cathode is rigidly mounted and a rotating anode having an anode dish rotatable by a drive arrangement, which is struck by the electron beam, accelerated with an electrical field, for producing x-rays. An electromagnetic system for the deflection and focusing of the electron beam has a number of current-permeated coil elements. The cathode generates a rotationally-symmetrical circular beam, and the rotational axis of the anode dish is offset from and parallel to the axis of the electron beam by the average radius of the anode dish edge. The electromagnetic system generates a dipole-free quadrupole field that deforms the electron beam cross-section.

Abstract: In an X-ray diagnostic apparatus, for acquiring the cross-section, position and/or alignment, relative to a target, of an electron beam generated by an electron generating system, at least one conductor is provided in the region of the target so that a signal can be derived by the conductor under the influence of the electron beam and supplied to an evaluation stage. The conductor is composed of a material having an atomic number lower than that of tungsten, so that no undesirable radiation arises due to the interaction of the electrons with this conductor.

Abstract: An anode for an x-ray tube has an incident surface on which an electron beam is incident for generating x-rays emanating from a focal spot. In at least that region wherein the focal spot is located during operation of the x-ray tube, the incident surface has a step-like structure with end faces that reside at a substantially right angle relative to the electron beam during operation of the x-ray tube. The end faces are connected by respective sidewalls, and backscattered electrons from the end faces strike the sidewalls and generate x-rays in addition to x-rays emanating from the end faces struck by the electron beam, thereby improving the efficiency of x-ray generation. A similar improvement can be achieved by an anode having a roughened surface in the region of the focal spot.

Abstract: An x-ray tube has an anode and an electron emitter from which an electron beam emanates, the electron beam impinging the incident surface of the anode in a focal spot from which a useful x-ray beam emanates. At least in the region of its electron-emitting surface, the electron emitter is formed of an electron-emitting material that has a lower electron affinity than tungsten (a low-temperature emitter). Further, an apertured diaphragm at anode potential is arranged between the electron emitter and the anode and through which the electron beam passes. As electron-emitting material, the electron emitter contains lanthanum hexaboride (LaB.sub.6) or an alloy of the systems iridium/cerium (Ir/Ce) or iridium/lanthanum (Ir/La) systems.

Abstract: In an x-ray beam computed tomography apparatus having a ring anode scanned by an electron beam for producing an x-ray beam which rotates around an examination region, measurement of the intensity distribution in the electron beam is enabled at various locations of the ring anode during operation. For this purpose, the ring anode can have at a number of locations around its circumferential direction, insulated sub-anodes with an insulating interspace therebetween, to which a measuring arrangement for measuring the charge distribution, and thus the intensity distribution, in the electron beam is connected. The charge distribution is measured when the electron beam sweeps the interspace between two sub-anodes.

Abstract: The invention is directed to a plain bearing part for a liquid metal lubricated plain bearing, the plain bearing part having a bearing surface that is in contact with a liquid metal during operation. This bearing surface is provided with a layer of a metal effective as diffusion barrier for the liquid metal and which is well wetted with the liquid metal. The layer is applied according to a PVD process.

Abstract: An electron generating assembly for an x-ray tube has a thermionic cathode and an electrode system for accelerating electrons emitted by the thermionic cathode, and an electron multiplier disposed in the electron path. In order to achieve a given electron beam density, the electron beam current emitted by the cathode can be reduced dependent on the multiplication factor of the electron multiplier, thereby extending the service life of the overall assembly. The electron multiplier can be controllable.

Abstract: According to the invention, at least one magnet element is provided for generating a guide magnetic field such that the electrons are guided at a spacing from the elongated anode. At least one kicker magnet is provided for generating a kicker magnetic field such that the electrons are steered onto the elongated anode in the region of the kicker magnetic field. The kicker magnet is implemented as a permanent magnet.

Abstract: An x-ray tube has an annular vacuum housing through which an electron beam passes in an annular path, an annular target from which x-radiation emanates during operation of the x-ray tube when the electron beam strikes it at a point of incidence, and a beam deflector which is movable along the circumference of the vacuum housing and which deflects the electron beam such that it is incident onto the target at a point of incidence that is dependent on the position of the deflector along the circumference of the vacuum housing. An x-ray beam emanating from the target is thus caused to move around the interior of the vacuum housing in the manner necessary for producing computed tomograms of a subject disposed in the interior of the vacuum housing.

Abstract: In an electronic x-ray computed tomography apparatus that enables a scanning of approximately 360.degree., the electron beam is guided in an annularly fashioned magnet arrangement that has a U-shaped cross section. The U enables the guidance of the electron beam to the annular anode and enables the emergence of the x-radiation. The magnet arrangement is composed of a number of side-by-side U-shaped magnet elements arranged to form an annulus with a coil for excitation of the magnet element respectively arranged on the cross bar of each U. A single magnetic arrangement is thus used to generate both the electron beam guidance field and, by means of a sudden polarity reversal of a magnet element disposed at a desired deflection location, the deflection field.

Abstract: A terminal block for a cable terminal unit comprises an insulating body which has receiving apertures in which in each of which a respective clamp is inserted which consists of a terminal contact and a separation and/or clamping device. The terminal contact is formed integrally with the separation and/or clamping device and at least one guide surface is provided for a wiring tool. With this construction it is possible to employ for wiring a single-strut wiring tool such as for example a common screw driver, whereby cost savings and operational simplifications may be achieved. Moreover, the terminal block has the advantage of simple and functionally reliable construction.