Abstract: After a plate or layer of non-metallic, particularly hard and brittle material has been provided with a (metal) mask having a plurality of apertures arranged in a pattern, it is exposed to at least one jet of abrasive powder particles, which jet is moved relative to the plate. The mask has its surface facing the surface on which the jet impinges secured to the plate or layer of non-metallic material by means of a layer of adhesive material having a thickness which is smaller than the size of the abrasive powder particles.

Abstract: A magnetic field sensor includes a number of magnetoresistive sensor elements situated in one plane, and which have the same privileged directions of magnetization, and a magnetization coil connected to a current pulse generator which alternately supplies the magnetization coil with opposite current pulses to generate a magnetic field which extends parallel to the privileged directions of the sensor elements and is strong enough to reverse the direction of internal magnetization thereof The magnetization coil includes an electrically insulating substrate which supports an approximately spiral-shaped electric conductor track including a group of parallel arranged active conductor elements. An electric current flows through the conductor track in the same direction in all active conductor elements of the relevant group.

Abstract: A device for the detachable fastening of an electrical service appliance such as a car radio, a CD or cassette player, an amplifier, a traffic control unit, and the like, in an insertion opening wall (12) of a mounting frame (9), which may be the instrument panel of a motor vehicle, which appliance comprises countersupports (20) which grip behind the mounting frame (9) in a mounted state forming a back-locking position in which the appliance has been passed into the insertion opening (10) from the front, and which countersupports can be moved from the back-locking position into a release position for releasing the appliance, wherein the countersupport is formed by a latch (20) which is pivotable about a rotation shaft, which is loaded by a spring (30) in a direction towards the back-locking position, and which comprises a curved edge (42) against which an unlocking key (8) can be passed, which key when passing along the curved edge (42) pivots the latch (20) into the release position against the spring pressu

Abstract: Vacuum tube comprises a ceramic element and method of interconnecting a ceramic element and a conductive element. A conductive connection consisting of a first layer containing silver and a filler and a second layer containing silver, gold or copper is formed between the ceramic element and the conductive element. The two above-mentioned layers are bonded together by means of diffusion bonding.

Abstract: A method for bringing a predetermined turn of a coil located inside the width of the coil and beneath at least one layer of the coil and a coil made by such method.

Abstract: An electric motor includes a rotor having at one end a plastic journal bearing which is rotatably supported in an annular portion of a metallic bearing member secured in an integrally-molded bearing support part of a stator. This part is molded to provide axially adjacent first and second cylindrical bores. The annular portion of the metallic bearing member is interference fitted into the first bore and has a plurality of angularly-spaced locking tabs which pierce respective sidewall portions of the second bore.

Abstract: A color display tube system having an electron gun producing three co-planar electron beams which are non-convergent, i.e. parallel or divergent. A convergence element located at a distance from the electron gun and coaxial with the tube axis then produces convergence of the electron beams at the display screen by generating a static 45.degree. 4-pole field. This combination reduces growth of the scanning beam spot in the horizontal direction at the ends of the horizontal axis, which is a problem encountered with electron guns which are convergent.

Abstract: An engine throttle is controllably positioned by an electric motor which is coupled to the throttle through engaged, first and second, variable-radius scroll gears. The motor works against the force of a throttle return spring, and this force increases as the throttle is driven away from a fail-safe position. By choosing the variation of the ratio of the scroll gear radii to match the variation of the force developed by the spring with throttle position, a constant driving torque produced by the motor will overcome the increasing torque produced by the spring.

Abstract: In an FMCW radar system, the velocity of obstacles relative to the radar couples a Doppler frequency shift into the return signal which causes an error in the range measurement. It is known to use a radar signal having a frequency ramp that both increases and decreases to distinguish the range of an obstacle from its velocity but when multiple obstacles are present this is not practical. By using a measure of velocity from a succesion of return signals, which of the radar output signals from the upsweep and downsweep of the radar signal that relate to a particular obstacle can be identified so that the range and velocity can be determined accurately. The FMCW radar system may be provided with a frequency scanned antenna, the beamwidth determined by the processing circuitry is variable according to the size of the obstacle being detected or the range at which the radar is searching for obstacles.

Abstract: Color display tube with a shadow mask, a shield of a ferromagnetic material and a demagnetizing device having a set of demagnetizing coils. The demagnetizing device is provided with means for energizing the demagnetizing coils in two steps which are shifted in time with respect to each other, while the location of the turns of the demagnetizing coils is such that upon the passage of current through only the one coil, the magnetic field generated by the coil is capable of demagnetizing those parts of color selection electrode and screen which are not demagnetized upon the passage of current through only the other coil, and conversely.

Abstract: Display system for displaying a net of interconnected geographical paths provided with associated geographical names and road vehicle with on-board road-based navigation system having such display system The display system allows to display a steady net of distinct and interconnected geographical paths and stores the net as an arrangement of vectors each associated to a particular path. First, an intended selection is read from the net for displaying. The storage contains the vectors often provided with an associated geographical name. For easy and clear display, the system has a font generator for the path name for when ready for display, displaying the name as a row of characters alongside its associated displayed path while featuring a multi-valued and finite orientation repertoire for the characters.

Abstract: Color display tube of the 3-in-line type having a display screen with a pattern of phosphor rows. The display tube has a shield with two long walls, two short walls and one gun-sided aperture. Viewed at least in projection, at least one area having a decreased magnetic permeability and extending in the longitudinal direction of the tube between the edges of the wall and the aperture is present in the material of each long wall.

Abstract: Flat-panel type picture display device having a luminescent screen and a large number of electron propagation ducts operating by means of electron wall interaction. At a given resolution, hexagonal phosphor dot patterns in which dots are horizontally staggered generally produce fewer artefacts than in a 90.degree. tilted orientation. An addressing system for withdrawing electrons from the propagation ducts and for directing them towards the luminescent screen is preferably formed as a multistepped structure with a preselection structure of rows of preselection electrodes and a fine-selection structure of rows of fine-selection electrodes. To interconnect the fine-selection electrodes in parallel in a minimal number of groups, it is advantageous when the fine-selection electrodes are arranged parallel to the preselection electrodes.

Abstract: An electromagnetic deflection unit (5) comprising a coil holder (6) with a flange (8) whose inner side supports coils (10a, 10b) for (line) deflection of electron beams. At the flange side of the coil holder (magnetized) preformed elements (14) are arranged within these coils so as to influence the magnetic field of these coils (10a, 10b), thereby reducing spreading errors, caused during manufacture, throughout the display screen. For the purpose of automatic mounting of the preformed elements, an annular support having predetermined locations (in particular from 12 to 36) for accommodating preformed elements is used. The preformed elements (14) are accommodated at a plurality of these predetermined locations and, if made of a permanent magnetic material, produce magnetic fields having magnetic strengths measured at a distance of some mm above the heart of the elements in the range between 1 and 1000 .mu.T.

Abstract: A navigation device which is operative to navigate a user along a selected route, utilizing displays of relevant map sections and the selected route. The relevant map section is updated by a control unit in accordance with changes in user's present position. The control unit includes a picture processor which controls the display unit to show in a distinctive manner within a relevant map section the route segment already travelled and the segment yet to be travelled. The resulting display can therefore be very quickly interpreted by the user.

Abstract: An X-ray tube, comprising a cathode arrangement which includes an electron emitter connected to supporting pins which in turn are connected to the cathode structure via a respective fixing element. Particularly simple adjustment of the position of the filament is achieved in that the fixing elements are connected to the cathode structure in a first region and to the associated supporting pin in a second region which is remote from the first region, and that the fixing elements comprise a deformation zone between the first and the second region, deformation of said zone enabling adjustment of the position of the electron emitter relative to the cathode structure.

Abstract: Picture display device includes a display unit having a vacuum envelope which is provided with a transparent face plate with a luminescent screen and a rear plate. The display unit includes a plurality of juxtaposed sources for emitting electrons, a plurality of electron transport ducts cooperating with the sources and extending substantially parallel to the face plate for transporting the electrons in the form of electron currents, and an active selection structure for withdrawing each electron current at predetermined locations from its transport duct and for directing the current towards desired pixels of the luminescent screen.The picture display device further includes a video signal processing circuit for receiving an incoming video signal having a given line number, for processing the video signal to a video signal which is suitable for the luminescent screen, and for applying the processed video signal to a video drive circuit coupled to the sources.

Abstract: In an electroacoustic transducer (1) having a diaphragm (5), a partition wall (24) situated behind the diaphragm (5) and traversed by partition openings (25, 26, 7, 28 and 29, 30, 31, 32), and a mask (37) arranged adjacent the partition wall and provided with mask openings (38, 39, 40, 41) which can be made to coincide with different openings (25, 26, 27, 28 and 29, 30, 31, 32, respectively) in different positions of the partition wall (24) and the mask (37) relative to one another, the mask is simply formed by a flange (37) of a magnet-system pan (19) of the magnet system (16) of the transducer (1).

Abstract: Display tube comprising a deflection unit provided with a (twist) correction device which includes an annular (twist) correction coil surrounding the tube neck, which coil, when energized by a circuit providing a (twist) correction current, generates a magnetic correction field in the axial direction of the display tube. According to the invention, the device also provides a 4-pole y field for correcting (twist) errors in the center of the display screen. This 4-pole y field can be generated by causing the turns of the annular coil to follow a path having four predetermined corrugations alternately facing the display screen and the electron gun.

Abstract: A coherent optical multichannel receiver includes a frequency down-conversion stage (10) having a laser local oscillator (12) for producing an IF signal which is applied to two frequency detection paths (26,28), the outputs from which are subtracted in a subtractor (30) to provide a data signal. AFC signal producing means (18,34) are also connected to the subtractor (30). In order to avoid a false lock occurring when the receiver is out-of-lock, detection means are provided for detecting an out-of-lock situation. The detection means is coupled either to a bandpass filter (36 or 38) to alter a property of the bandpass filter when the receiver is out-of-lock so that the subtractor (30) provides a positive output which is used to offset the frequency detection characteristic so that it has a single positive zero crossing or to an offset voltage input V.sub.ofs in the AFC loop. The offset is removed automatically when the receiver returns to a lock situation.