Abstract:
An electronic component having electrically conductive contacts and a printed circuit board enclosed by a sheathing made from a first plastic, and a method for manufacturing the electronic component. Such electronic components are used in oil pans of a transmission. The electrically conductive contacts are enclosed by a frame made from a second plastic. The first plastic is a duroplastic, and the second one is a thermoplastic. The thermoplastic does not represent a barrier to transmission oil. It is used for shaping the duroplastic, prepositioning the electrically conductive contacts, and preventing mechanical reworking of the duroplastic. No projections such as tabs or flash layers are created.
Abstract:
For the representation of images of regions selected from the interior of an examination subject, coils are provided for the application of a primary magnetic field and of magnetic gradient fields to the examination subject. An electrical conductor configuration detects the deflection of the atomic nuclei of the examination subject from their position of equilibrium as a result of high frequency magnetic excitation pulses. The configuration is formed by two interspersed individual conductor configurations adapted for respective different measurement frequencies. Each configuration comprises parallel conductors connected at their ends and arranged in spaced relation to an electrically grounded surface to form a transmission line configuration resonant at a respective one of the measurement frequencies.
Abstract:
An antenna device for coupling to a magnetic high-frequency field in apparatus for nuclear spin tomography, includes at least two conductor sections of predetermined length which extend on an imaginary cylinder surface parallel to the direction of the axis of the imaginary cylinder and are arranged for current flow in opposite directions when one end of each of the sections is connected to an external device, a tubular enclosure arranged at a predetermined distance concentrically with respect to the imaginary cylinder surface surrounding the conductor sections, the enclosure being at least largely permeable to low frequencies for magnetic gradient fields, containing electrically highly conductive material and adapted to be connected to the external device, the tubular enclosure extending in the axial direction beyond the end of the conductor sections by a predetermined amount so as to form a circular waveguide antenna with a periodic wave propagation, the coupling elements of which are the conductor sections, and reflectors terminating the other ends of the conductors to reflect waves of the high-frequency field so that a high-frequency field oscillating in phase is formed by the tubular enclosure and the conductor sections.
Abstract:
An antenna device for exciting a magnetic high-frequency field and/or for receiving corresponding high-frequency signals in a nuclear spin tomography apparatus contains a tubular antenna part which is designed to largely pass low frequencies, for magnetic gradient fields, consists of electrically highly conductive nonmagnetic material and has means for connecting to an external energy feeding or receiving device. In order to permit a simple design for this antenna device, only the tubular antenna part is provided as a circular waveguide for exciting or receiving the high frequency field. The circular waveguide is provided at least in the region of the cross-sectional plane extending through the center of its axial dimension with a system of coupling elements for coupling in or out the corresponding high-frequency power. In addition, further coupling systems may be provided in at least two cross-sectional planes symmetrical to the central cross-sectional plane.
Abstract:
Electrical connectors (40, 104) including contact terminals that can be unmated without previously disconnecting power include main contacts (12, 112) and auxiliary contacts (16, 130) that are shunted by a positive temperature coefficient (PTC) resistor (6, 140) located between the main and auxiliary contact. The main contact (12, 112) will be disconnected first and the auxiliary contact (16, 130) can be longer than the main contact (12, 112). Arcing will not occur at the mating end of the main contact (12, 112), because the current will be shunted to the still connected longer auxiliary contact (16, 130). I2R heating will increase the resistance in the PTC resistor (6, 140), so when the auxiliary contact (16, 130) is disconnected, current will be below the arcing threshold. Multiple latches (54A,B) and (60A,B) or (180) and (196) permit only discontinuous mating and unmating or two state mating and unmating of electrical connectors, so that the connectors can be disconnected without arcing for a range of currents.
Abstract translation:包括接触端子的电连接器(40,104)可以在没有预先切断电力的情况下被不配合,包括由正温度系数(PTC)电阻器(6,140)分流的主触点(12,112)和辅助触点(16,130) )位于主触点和辅助触点之间。 主触头(12,112)首先断开,辅助触点(16,130)可以比主触点(12,112)长。 因为电流将被分流到仍然连接的较长的辅助触点(16,130),所以在主触点(12,112)的配合端不会发生电弧。 I <2> R加热将增加PTC电阻(6,140)中的电阻,因此当辅助触点(16,130)断开时,电流将低于电弧阈值。 多个闩锁(54A,B)和(60A,B)或(180)和(196)仅允许电连接器的不连续的配合和不匹配或两个状态的配合和脱离,使得连接器可以在没有电弧的情况下被断开, 电流。
Abstract:
A cable guide for use in a nuclear magnetic resonance tomography apparatus is provided for cable for making electrical connections between devices secured to a patient bed and devices disposed outside of the examination space. The cable guide is a grounded, electrical cable channel disposed beneath the patient bed and above the lower sub-antenna of a whole-body antenna and above at least one wall of the examination space. The cable channel has a V-shape, and is rounded at an edge facing the examination space, this edge projecting beyond the height of the lower sub-antenna. The cable guide substantially protects the cable against coupling with other components. The examination space remains free of built-in units.
Abstract:
Apparatus for generating a magnetic high-frequency field and/or for receiving corresponding high-frequency signals in a nuclear spin resonance apparatus, especially in medical technology, contains a surface coil which can be arranged within an at least partially homogeneous magnetic field region of a magnetic field which is generated by a base field magnet and is oriented along an axis, in the vicinity of a body or body part to be examined. In this apparatus, the sensitivity of the surface coil in the depth direction should be increased and be adjustable. In order to accomplish this adjustment, the surface coil has several turns which enclose each other at least partially and which are arranged at different geometrical points. Each turn preferably comprises substantially a single conductor section or of several conductor sections arranged in a group, the current flow directions being opposed to each other in mutually adjacent turns.