U.S. Philips Corporation

Constantius Johannes Panis

Jan Gerritsen

Johannes M Compen

Adriaan J Groothoff

Johannes Aloysius Van Leeuwen

Jan Hendrik Duistermaat

Martin Clemens Van Der Heijde

Cornelius J Paridaens

Reinhart C Eisses

A picture display tube comprising an internal resistive layer to restrict the peak current which at the operating potential of the tube is associated with an electrical flash-over possibly occurring therein. The effective part of the resistive layer extends in the neck and over the transition from neck to cone of the envelope of the tube. The resistive layer represents a static resistance value of at most 10.sup.4 Ohm and a dynamic resistance value of at least 300 Ohm.

Picture display tube having an internal resistive layer

A degaussing device for a color television display tube having three electron guns arranged in one horizontal plane and vertically directed phosphor strips on the display screen, comprising degaussing coils which envelop a major part of the conical surface of the tube and are arranged such as to generate a vertically directed magnetic field, and a capacitor connected parallel to the degaussing coils, the impedance of the capacitor being high at the frequency of the degaussing current and low at the frequency of the line deflection current.

Degaussing device for a color television display tube

In a picture display tubes having deflection angles of 110.degree. and more the conical central part near the transition to the neck has a substantially flat variation perpendicular to the tube axis. As a result of this an accurate positioning of the deflection device on the display tube is seriously hampered. This problem is solved by centering members which are present on the conical central part and which cooperate in a self-centering manner with centering members forming part of the supporting cage of the deflection device. The position of the deflection device in the axial direction is accurately fixed by abutment members forming part of the supporting cage in co-operation with abutment surfaces forming part of the envelope of the tube.

Picture display device and deflection coil both having self-aligning

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Eindhoven, Netherlands

Constantius Johannes Panis