Videocolor

Claude Pons

Guiseppe Giannantonio

Cesare De Paolis

A method is disclosed for the setting of the static convergence and/or purity of a color television tube using permanent magnets. Magnetizable elements are fixed around the color television tube. These elements are evenly distributed around the axis of the tube. To correct the static convergence and/or purity errors, each element is magnetized by means of a corresponding coil, the position and dimensions of which are such that the element is subjected solely to the field within the turns of the coil.

Method and device for setting the static convergence and/or purity of a

An apparatus for adjusting the static convergence and/or the purity of a color television tube particularly of the kind having a perforated mask. A magnetizable ring encircles the neck of the tube. Poles are formed in this ring by means of coils displaceable in such manner that these coils and/or their cores are applied against the periphery of the magnetizable ring. The application of the coils or of their cores against the ring renders constant the relationship between the current supplied to these coils and the intensity of magnetization obtained.

Method and apparatus for adjusting the static convergence and purity of

An apparatus for adjusting the position of the deflector of a television tube, particularly a color tube, especially so that the tube deflector assembly may become autoconvergent. The apparatus comprises a platform movable in accordance with n degrees of freedom and n elements such as arms, each of which has its displacement controlled in accordance with only one degree of freedom, for example a simple translatory displacement in order to assure the mobility of the platform in accordance with the n degrees of freedom.

Apparatus for adjusting the position of a deflector on a television

Process for adjusting the static convergence and/or purity of a color television tube by using a magnetic ring surrounding the neck of the tube and coils creating in this ring induction poles of values selected to carry out the adjustment. To the terminals of each coil a current impulse is applied conferring on the remanent induction an important value higher than that necessary to carry out the correction; then a current impulse is applied in the opposite direction effecting a partial demagnetization in such a way that the remanent induction allows the desired adjustment.

Process and apparatus for the rapid adjustment of the static convergence

The present invention concerns a process and a device for aligning and centering an assembly of electron-guns on a color television tube during the manufacturing process. To do this, the image of the markings of the assembly of electron-guns is formed on analyzers, each comprising a charge-coupled photosensitive strip. The alignment is observed when the comparison signal is lower than a predetermined value. Instead of markings, the image of the sections of the assembly of guns can be used as the section comprising the grid G4 in the cup.

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Rome, Italy

Claude Pons