US 6,720,725 B2 · Picture display device with reduced deflection power

Abstract

A picture display device comprising a cathode ray tube (1) with an elongated display screen (8) and a deflection system (9) is described. The deflection power is reduced by two means. The deflection system (9) is arranged to scan the lines in the direction of the short axis (22) of the display screen (8), and the cone portion (3) of the cathode ray tube (1) has an elongated cross-section (54) whose aspect ratio is larger than or equal to the aspect ratio of the display screen (8), thereby enabling the deflection system (9), and in particular the line deflection subsystem (12), to be positioned closer to the electron beam envelope (51), which reduces magnetic losses.

Claims14

Dependent claims

A picture display device comprising

a cathode ray tube having an elongated display screen with a long axis and a short axis, a cone portion whose cross-section has an elongated shape with a long axis and a short axis, a neck comprising means for generating at least one electron beam, and
a deflection system mounted on said cone portion for generating electromagnetic fields for deflecting said electron beam(s) in a line direction that is substantially parallel with said short axis and in a frame direction that is substantially parallel with said long axis,
wherein a part of the cone portion under the deflection system has at least one cross-section whose internal outline has a long axis/short axis ratio (Ac) which is larger than or equal to the long axis/short axis ratio(Ascr) of the display screen.

Dependencies are inferred from the claim text.

Picture display device with reduced deflection power

Life of this patent

Picture display device with reduced deflection power

Life of this patent

Abstract

Claims14