Abstract: In a tangential blower, the vortex former is provided on the suction (intake) side with a sharp-edged interfering body at least extending over one-half of its length. The interfering body reduces siren like noise which would otherwise be produced.

Abstract: An apparatus for the assembly and alignment of a video display device having a base plate and a holding device, the base plate including a plurality of movable adjusting studs projecting therefrom for engaging a plurality of alignment holes located in a plurality of structured plates of the video display device. The holding device includes a plurality of adjustable stops for engaging and aligning a spacing frame and a screen plate. Each alignment hole includes a diameter reducing metal ring to ensure precise alignment of the structured plates which are aligned and joined to the spacing frame and screen plate. The video display device is then removed from the apparatus.

Abstract: A video reproducing device having a flat screen loosely placed in a mounting frame. The flat screen supports an elastic safety sheet affixed thereto for providing implosion protection if the flat screen shatters. A space is created between the frame and the flat screen for accommodating a sealing compound and a thin glass plate protects the safety sheet from external objects.

Abstract: A rotation rate measuring instrument is disclosed in which two light beams propagate through a coiled optical fiber in opposite directions. After passing through the optical fiber, the two light beams are combined and directed onto a photodetector. One of the light beams is phase-modulated in a phase-modulator before entering the optical fiber. The modulation frequency is f.sub.m. The output signal of the photodetector is fed to a variable-gain amplifier whose output signal is separated into a signal of frequency f.sub.m and a signal of frequency 2f.sub.m. The rotation rate is derived from the signal of frequency f.sub.m. The signal of frequency 2f.sub.m is applied to a detector whose output is fed to an operational amplifier. The other signal applied to the operational amplifier is a reference signal of amplitude U.sub.R. The operational amplifier controls the gain of the variable-gain amplifier in such a way that the output signal of the detector has the same amplitude as the reference signal U.sub.R.

Abstract: A rotation rate measuring device is disclosed in which two beam portions travel around an optical-fiber coil (6) in opposite directions, and in which the Sagnac phase difference between the two beam portions after passage through the optical-fiber coil is evaluated. A beam splitter (2) divides a light beam into the two beam portions. Between this beam splitter and one end of the optical-fiber coil (6), an additional beam splitter (4) is inserted which is followed by a spatial filter (13) and a frequency shifter (5). Also provided are means which ensure that the two beam portions which travel around the optical-fiber coil in opposite directions pass through the spatial filter and the frequency shifter by the same path. A fully reciprocal arrangement is thus obtained.

Abstract: The multiplexer/demultiplexer consists of a plurality of elements (105, 106, 107, 108) made of optically transparent material which are cemented together and on which filter layers (101, 102, 103, 104) are deposited so as to form wavelength-selective beam splitters.

Abstract: In coating a smooth glass faceplate panel with phosphor to produce a phosphor screen for use with flat color picture tubes, a basic mask is placed onto the glass faceplate panel. Thereafter; one at a time, one coating mask for each respective color is placed over the basic mask and the phosphor belonging to the respective coating mask is deposited. The phosphor is dispersed in a reactive binder and meets with an activator sprayed on or otherwise applied to the glass faceplate panel.

Abstract: To detect horizontally moving portions of a TV frame formed from two adjacent fields, the vertical local frequency at a vertical edge of the moving portion of the picture is measured with a narrow-band-pass filter circuit which is tuned to the local frequency of the comblike structure at ta vertical edge of staggered lines of the two fields of the frame. When such an edge structure is detected, the circuit delivers a detection signal.

Abstract: A communication system with fixed stations (FS), mobile stations (MS), and control stations (LS) is disclosed in which the control stations are interconnected by transmission paths and have additional, closed transmission paths connected to them. In the transmission paths, the fixed stations (FS) are arranged in series. Communication is on a time-division-multiplex basis. The control stations (LS) assign the TDM channels to the individual mobile stations (MS) via the fixed station (FS) in charge of the respective mobile station.

Abstract: A receiver for bandspread signals having a pseudo-random code stored in the receiver for synchronization with a pseudo-random code (PRC) of a received and modulated signal for recovering the modulation utilizing control loops. The modulated carrier signal is frequency converted, digitized and then multiplied by the stored PRC. The signal provided is sampled at twice the rate at which the PRC is read out of memory and provided to a counter forming I and Q signals from the counter output values in the control loops for determining a plurality of controlled variables required for synchronization and demodulation.

Abstract: Hold members are used for abutting a shadow mask on the pins in the rim portion of the faceplate of a color picture tube. These hold members are of a two-part design and connected to one another with the aid of means permitting a transverse movement in relation to the axis of symmetry of the color picture tube. These means may consist either of a swivel joint or of a straight line motion device. During the first insertion of the shadow mask into the faceplate, any possible tolerances of the pins can be compensated for because the possible transverse movement of the hold members. The spacing between the shadow mask and the phosphor screen is not affected.

Abstract: The blocking protection arrangement includes a first transistor whose emitter-collector path lies in the base voltage supply of second and third switching transistors performing commutation. The first transistor receives its base voltage from a self-induction voltage of a stator winding. In the event of a blocking of a motor, this voltage is missing, so that the first transistor is rendered nonconductive.

Abstract: A horizontal deflection circuit is disclosed in which the junction point between a bidirectional switch, a trace capacitor, and a retrace capacitor is grounded through a transistor. The latter is controlled by a control voltage for picture-width stabilization and pincushion correction. It may be shunted by a capacitor and a biased diode.

Abstract: A rotation rate measuring instrument for measuring the rotation rate of a fiber gyro having a light source, a series of beam splitters, a phase modulator, a coiled optical waveguide and an evaluating circuit provides a first and second light beam which traverse the coiled optical waveguide in opposite directions. At least one of the light beams is modulated at an angular frequency .omega.m in the phase modulator while at least one of the light beams is further modulated at a second frequency .omega.s. The frequencies are distinguishable in the evaluating circuit permitting the suppression of signal components caused by light reflected at the boundaries of the phase modulator.

Abstract: In a color picture tube, the shadow mask is suspended in a way such that the pins inserted into the rim portion of the faceplate are aligned vertically in relation to the axis of symmetry of the color picture tube. The free ends of the pins are of spherical design, and comprise a conical part. Two-piece, trapezoidal hold members for the shadow mask rest on the pins. Each of the hold members is resiliently pressed upon the pins by a locking spring.

Abstract: An optical receiver which consists of an optical attenuator, an optical-to-electrical transducer, an amplifier, and an automatic level control circuit. The optical attenuator is an electrooptical modulator which is electrically controlled by the automatic level control circuit.

Abstract: An electronically commutated dc motor having a dome-shaped external rotor and a stator having a double-T-shaped design with the stator consisting of one yoke stack disposed asymmetrically in relation to the longitudinal stator axis and of two pole stacks of which each is provided with an extension on the same side in the longitudinal direction. In the circumferential direction the extensions are provided with lugs.

Abstract: An electronically commutated, collectorless direct current motor having a permanent magnet rotor comprised of a cup-shaped hollow cylinder in whose interior an internal magnetic yoke is arranged, an internal stator core and an external stator core. A stator drum winding comprises a plurality of phase windings wound on an insulating body with a portion of the stator winding being commingled with the phase windings in a plurality of slots of a slotted stator. The insulating body has a novel shape for arranging the stator winding thereon and for inserting the insulating body into a plurality of slots of the external stator core.

Abstract: Measuring apparatus for measuring the position of a light source inside a lighthouse as used in the manufacture of phosphor screens of color picture tubes comprises a base plate and two optical projection devices which are directed on to the light source, and which each contain at least two position diodes. An evaluating circuit connected thereto ascertains the position of the light source and the result is fed to a display device.