Abstract: A brightness signal distortion correction circuit (8, 11, 21) is provided for a video recorder, having distortion correction circuit (11), responsive to frequency-modulated brightness signals, and further responsive to feedback disturbance recognition control signals (U, J), for providing distortion corrected brightness signals; and also having disturbance recognition circuit (21), responsive to the distortion corrected brightness signals, for providing the feedback disturbance recognition control signals (U, J). In one embodiment, the distortion correction circuit (11) includes an adjustable transmission circuit (8) being arranged between the distortion correction circuit (11) and the disturbance recognition circuit (21), and having a voltage divider circuit (50, 51) including a resistor (51) and first and second diode circuit (50), responsive to the disturbance recognition control signals (J).

Abstract: A conical loudspeaker (10) has a dust protection cap (23) of hot-pressed polymer foam. Dust protection caps (23) made from this material are largely insensitive to finger pressure and can be attached to the conical speaker membrane using simple adhesives. Preferably the outer rim of the conical speaker membrane is secured by a lock beading (14) made from the same foam as the dust protection cap (23). This has the advantage that if the pressing die is suitably configured, the dust protection cap (23) can be made from the portion of the foam mat that otherwise, if only a lock beading (14) was being produced, would be left over in the center of the foam mat.

Abstract: A video recorder for recording and reproducing video signals having a bandwidth with a limited upper transmission frequency, including HDTV signals. A recording signal processing circuit (14) with a first scanning circuit (10.1) for scanning the video signal to be recorded with first scanning recording pulses of a first scanning frequency that is at least equal to the limited upper transmission frequency, for providing the first recording signal (AS1), and a second scanning circuit (10.2) for scanning the video signal to be recorded with second scanning recording pulses that are displaced through half a cycle with respect to the first scanning pulses of the first scanning circuit (10.1), and having a second scanning frequency equal to the first scanning frequency, for providing the second recording signal (AS2). A recording/playback circuit (15, 16) includes recording-reproducing heads (11.1, 11.

Abstract: In a process for treating an organic orientation layer on a substrate plate for a liquid crystal cell, the orientation layer for causing the orientation is rubbed in the conventional way in a specified direction. Rubbing is then performed in the opposite direction, but with a weaker rubbing pressure. Rubbing in the opposite direction with weak pressure leads to an increase of some degrees in the pretilt angle, and this is essentially independent of the material used for the orientation layer.

Abstract: The invention concerns a method of determining the angle of attack (pretilt angle) of liquid crystal molecules in a liquid crystal display (LCD) provided with top and bottom cover plates. The following steps are proposed for a simple and cheap determination: addition of a dichroic dye (17) to the liquid crystal (5) in order to cause the dye molecules (18) to become aligned by the crystal molecules (6), which are present in a twist-free state, determination by measurement of a maximum absorption value, the said measurement being carried out by causing a polarized ray of light (19) (measuring ray) to pass through the liquid crystal display (1) and varying its angle of inclination (.alpha.) with respect to the plane of the cover plates (2,3), and then using the angle of inclination (.alpha.) associated with the maximum absorption for determining the angle of attack (.delta.).

Abstract: A device for recording FM signals in helical-scan tracks of a video magnetic tape has a phase shifter disposed between an FM modulator and a write-head configuration, which subjects the FM signal from the FM modulator to a phase shift. The phase shifter determines a phase shift for a luminance signal which is determined by a first phase shift P1 for a line n of a track m; a second phase shift P2 for a line n+1 of the track m; and a third phase shift P3 for the line n located in the track m+1. For the line n+1 located in the track m+1, a fourth phase shift P4 has a value determined by the other three phase shifts such that a total phase difference D between a first phase difference D1 of the fourth and the second phase shifts (D1=P4-P2) and a second phase difference D2 of the third and first phase shifts (D2=P3-P1) measures 180.degree. (D=D1-D2=180.degree.

Abstract: The invention specifies a calotte-type (encased) loudspeaker distinguished by very small dimensions. The pot magnet (12) is joined to a single-piece case component (11) exclusively by means of elastic snap catches (32) such that a terminal locking hook (35) forming an integral part of the said snap catches (32) engages with a collar (25) arranged on the pot magnet (12). After the case component (11) and the pot magnet (12) have been joined together, the membrane (21) is kept in position between the case component (11) and the pot magnet (12) exclusively by virtue of the fact that the part of the membrane (21) that bears against the pot magnet (12) is pressed against the said pot magnet (12) by the free end (29) of the piece of tubing (28) attached to the case component (11).

Abstract: To prevent the formation of a corona (2) in a known in-line color picture tube with an automatic-focusing deflection system and four grids (G1-G4), a rectangular opening is provided on the side of the second grid (G2) facing the first grid (G1). As a result, the luminous spot (1) formed by the electron beam at the center of the screen is converted to a vertical ellipse and the ratio of the axes of the lateral ellipses on the edge of the image is reduced, thus improving the sharpness of the edges. The openings (5) in the first grid (G1) are elongated in the in-line direction, in particular rectangular, the adjacent openings of the second grid (G2) are also rectangular and all the other openings in the other grids (G2, G3, G4) are circular. In this way, the ratio of the axes of the luminous elliptical spot (11) produced by the electron beam at the center of the screen is reduced without adversely affecting the sharpness of the edges.

Abstract: A method of producing a substrate plate for a liquid crystal cell with black matrix areas in which blackened polymer material is already deposited before the structured areas of photosensitive resist overlying the structured electrode areas are removed. Rather, these structured areas of photosensitive resist are removed only after the blackened polymer material has been hardened.This processing sequence has the advantage that no special alignment processes are needed in order to arrange the black matrix areas accurately between the electrode areas.

Abstract: In a process to manufacture a liquid crystal cell, one of the two plates is provided with an adhesive edge strip. A quantity of liquid crystal which is required to form the liquid crystal layer is applied to one of the two plates and the two plates are brought together and positioned in the vacuum and bonded tightly together by the adhesive curing.By the fact that the plates with the correct quantity of liquid crystal on one of the plates are joined together in the vacuum, it is no longer necessary to evacuate the inner space between the plates in a time-comsuming process and apply liquid crystal through a small filling hole in another time-consuming process.

Abstract: In a method of recovering phosphor for picture tubes from phosphor sludge, the phosphor sludge is first subjected to a steam treatment, thereby causing substances adhering to the surface of the phosphor particles to pass into solution. The phosphor is then washed several times. Following wet screening, one then obtains a phosphor suspension that can be further processed just like virgin phosphor. The said method does not comprise any drying or calcining processes. The steam treatment causes the phosphor particles in the phosphor sludge to lose their tendency to cluster and form lumps, so that one obtains a high-yield suspension of very fine phosphor particles that can be further processed without any additional grinding or homogenization steps.

Abstract: In a process for applying orientation layers to cell plates (11.o, 11.u), the cell plates are arranged in relation to a centrifuge rotational axis (14) so that the plate planes lie parallel to the rotational axis. The centrifugal forces then act over the entire plate surfaces in the same direction in each case. This leads to a homogeneous pre-alignment of the orientation layer molecules.Because a homogeneous pre-alignment of orientation layer molecules can be achieved with this process, an improved orientation effect can be obtained.

Abstract: For a flat display device, a control subassembly is needed which consists of two control plates (1;7) each formed by a layer of parallel conductors (2;8) which are isolated from each other. During the manufacture of the control subassembly, the first control plate is provided with a glass frit in the form of continuous strips (10) perpendicular to the conductors. The glass frit is set, and the application of the strips is repeated. The second control plate is then put on the first control plate in such a way that their conductors are mutually perpendicular. After that, the glass frit is crystallized.

Abstract: A black-white liquid crystal display (10) contains a nematic liquid crystal with a twist of 270.degree. between cell plates. The product of the liquid crystal layer thickness and anisotropy of the refractive index is about 0.38. A pretilt of about 15.degree. is present. The polarization directions (P1, P2) have an angle .beta. of 45.degree. to the orientation directions (Mo, Mu). This display features a very wide viewing angle range with relatively little dependence of the contrast on the viewing angle and there is an almost complete absence of color shift depending on the viewing angle. Due to the significant enhancement in viewing angle range in relation to contrast and color neutrality compared with all known cells, the display is called "Extended Viewing Angle" display (EVA display). It has a very high multiplexability.

Abstract: A method of manufacturing luminescent screens (2) for, e.g., color picture tubes is described. It uses a printing apparatus with heated printing blocks (3) and tampons (4). The printing inks (D) consist of a mixture of a hot-melt adhesive and the respective luminescent materials. The printing inks are printed from the printing blocks directly on the inside of the faceplate (1) of the color picture tube. It is also possible to first print a black matrix (M) of a ceramic glass color.

Abstract: A remote control transmitter includes a function selector device (17) for outputting selection signals in dependence on a function selected by operating the device. A function is selected by tilting the function selector device which includes optically functioning tilt switches. For this purpose, a ball guide housing (50) is constructed with five ball resting places, i.e. places in which a ball (K) within each specified tilt range always adopts a stable position. At one of the ball resting places a light transmitter (D) is mounted, while at other ball resting places light receivers (P1-P3) are located. A multi-bit signal is outputted by the light receivers, with the different bit sequences corresponding to different selection signals.

Abstract: After it has been evacuated, a liquid crystal cell whose filling hole is located at a corner of the cell is immersed into a liquid crystal material inside a vacuum jar and immediately raised again, whereby a drop of liquid crystal material forms at the filling hole. Then the vacuum jar is quickly aerated and the cell is filled outside the vacuum jar. The volume of the drop and the volume of the cell have to be brought into line with each other in such a way that the drop volume is at least as great as the volume of the cell interior so that filling can take place with the drop volume only.

Abstract: A coil-carrier half (11) for a saddle-coil arrangement for a cathode ray tube accomodates a saddle-coil winding, in a front groove (13), a rear groove (14), left slots (18.11-18.51) and right slots. Prolongation of the left slots in comparison with the right slots results from the presence. in a rear wall (15.h) of a front-groove, at the positions where the left slots open out into the groove, of steps which are greater towards the front than at the fan-out positions of the right slots.In an asymmetrically built coil-carrier half of this sort, turns (12)' are introduced in each slot so that they run towards the prolongation position of the slot. This produces a saddle-coil arrangement which leads to fewer image defects than when a conventional saddle-coil arrangement with symmetrical coil-carrier halves is used.

Abstract: An instrument for measuring ionization radiation acting upon a person is mounted in a housing which can be carried in the pocket of a garment, the housing includes a forwardly projecting portion having a radiation detector mounted in the forwardmost portion thereof, so as to be exposed to a wide angle of ionizing radiation. A display unit is located in an upper wall of the housing facing in a direction which may be read by the person.

Abstract: A remote control transmitter contains on a circuit board (3), which is rigidly connected to the transmitter housing (1) of the remote control transmitter, a positional-deviation switch configuration (17), which in the event of an angular deviation of the circuit board (3) and thus of the remote control transmitter beyond a particular trigger angle (a.sub.o) from a particular given or instantaneously determined reference operating position generates an output signal designating the direction of the positional deviation. In a signal converter (5) of the remote control transmitter, this direction-dependent output signal is converted as a control command into a transmission signal, and emitted via a transmitter element (4) of the remote control transmitter to a remotely controlled electrical appliance.