Abstract: A winding apparatus, for winding saddle coils for deflection units of picture tubes, has a wire guide tube that is movable along the contour of the desired windings in three mutually perpendicular planes. A receiving device for the coil form is rotatable about its longitudinal axis. In another embodiment the coil form remains stationary and the wire guide tube has one end angled at 90.degree. and rotatable about its longitudinal axis.

Abstract: In a cathode-ray tube with a thick grid No. 2 (24) in the electron-gun system, current transfer into grid No. 2 (24) may result in a lack of picture sharpness. To avoid this error, the aperture (4) in grid No. 2 (24) has a widening (6) of conical shape or stepped diameter.

Abstract: A rack for supporting a cathode-ray tube during sealing of the screen portion of the tube to the bulb cone portion of the tube is disclosed. The rack includes tubing mounted to the rack through which gas can be blown into the tube. An exit end section of the tubing is of flexible design and includes a helical spring and a plurality of resilient leaf spring tongues for aligning the tubing in the neck of the cathode-ray tube.

Abstract: The invention relates to a flat display device with a faceplate (1) having either an outward curvature or bulging inwards under the action of atmospheric pressure, the device also comprising a planar deflection device (8) to deflect the electron beams (13, 14) in each line. With a view to obtaining a pure-color image, the deflection voltages are corrected according to the particular distance between the deflection device (8) and the faceplate (1), thereby ensuring that the electron beams (13, 14) will impinge only on the appropriate equidistant phosphor dots or strips (4). The formula for calculating the correction factor (K) is stated.

Abstract: In a glass viewing screen for a color-picture-reproducing device, the phosphor areas deposited on the inside of the glass viewing screen are surrounded by a sealing-glass matrix. The matrix is made of a sealing glass that shrinks upon thermal crystallization so that the sealing glass may be deposited by screen printing.

Abstract: A conductive suspension for making contact to the inside of a picture tube consists of graphite, glass-frit powder, a binder, such as nitrocellulose, a solvent, such as isoamyl acetate. It can be applied prior to or after the aluminizing process by various techniques, such as brushing, printing, or spraying, and permits the bake-out process and the frit-sealing process to be performed in one step because it is permeable to organic substances. It is easy to remove from defective tube parts by conventional cleansing techniques.

Abstract: The electron gun system of a color picture tube has coined depressions in the area of the apertures for the electron beams in at least one grid electrode, the coined depressions in one side of the grid electrode being concave. Preferably, this is the side of the grid electrode facing the cathode.

Abstract: During the formation of a black-matrix layer on the inside surface of a faceplate of a color picture tube, the development of the photoresist coating takes place in an atmosphere with a relative humidity of between about 80-100% and at a temperature of between about 30.degree.-50.degree. C.

Abstract: A winding apparatus, for winding saddle coils for deflection units of picture tubes, has a wire guide tube that is movable along the contour of the desired windings in three mutually perpendicular planes. A receiving device for the coil form is rotatable about its longitudinal axis. In another embodiment the coil form remains stationary and the wire guide tube has one end angled at 90.degree. and rotatable about its longitudinal axis.

Abstract: The shadow mask (2) of a color picture tube has retaining springs (6) near its corners and parallel to its rim. The free ends of the retaining springs (6) extend into the corners of the faceplate (1), where they rest on spherical ends (10) of studs (5). The ends of the retaining springs (6) are bent so as to be perpendicular to the longitudinal axes of the studs (5).