U.S. Philips Corporation

Petrus A Fleuren

Antonius W Van Der Heijden

Gerardus M Van De Hei

Petrus A Strijbos

Display tube with a deflection unit which is mounted thereon and includes a funnel-shaped coil support. After the optimum position of the deflection unit has been set with respect to the display tube, the coil support is fixedly secured to the envelope of the display tube. A shrink sleeve which is partly shrunk around the narrow end of the coil support and partly around the envelope of the tube is used for fixation.

Display tube with deflection unit secured thereon by means of a shrink

Device for assembling an integrated electron gun system 5 for a color display tube of the 'in-line' type which is composed of a number of electrodes centered around an axis. The device comprises a centering pins situated with their longitudinal axes substantially in one plane, on which the electrodes are positioned and are then fixed mechanically with respect to each other. If such a device comprises three centering pins (60, 61, 62) which, at least at the area of the apertures in the electrodes, have a substantially elongate perpendicular cross-section so that only selected parts (64, 65) of the centering pins contact the inner wall of the apertures in the electrode, the longitudinal axes of the cross-sections of the outermost pins being substantially perpendicular to the surface and the longitudinal axis of the cross-section of the central centering pin being substantially situated in the plane, the electrode can be positioned more accurately than with the device used up till now. If in addition at least two reference surfaces (67) and (73, 74) are used for the positioning of the electrodes in the axial direction, in which the location of the control grid, the first anode and the second anode is determined by a first reference surface (73, 74) and the location of the focusing lens electrodes is determined by a second reference surface, which first reference surface is determined by inwardly-stepped surfaces (73, 74) provided perpendicularly to the axes of the outermost centering pins, and the second reference surface (67) is formed on the base to which the centering pins are connected, it is possible to position the electrodes even more accurately with respect to each other as a result of which the spreading in the beam displacement is reduced by at least 50%.

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Nuenen, Netherlands

Petrus A Fleuren