Abstract: Cathode ray tube for which the front face is flat and/or for which the deflection angle is greater than 110°. The tube comprises a front panel supporting a luminescent screen surrounded by a flange perpendicular to the panel, the said panel being defined by: a thickness t at the corner of the screen, a distance t1 between the corner of the screen and the free edge of the flange, a rear part in the form of a funnel, whose tapered free edge is arranged at the distance t2 from the reference line of the tube. The tube is characterized by values of t, t1, t2 chosen in such a manner that the ratio A=(t1+/t)/t2 is between the range of values [0.0061?m?7.8 10?6(?m)2±0.05]. for which ?m is expressed in degrees. Hence, the quantity of glass reduced while providing the mechanical strength necessary for resisting the application of a vacuum to the tube.

Abstract: Cathode ray tube comprising a colour selection frame/mask assembly suspended within the front face of the said tube by suspension means composed of a first metal member comprising a central elastic part, a first extremity portion comprising a aperture designed to fit around a pin joined to the front face of the tube, and a second extremity portion attached by welding directly or indirectly to the frame the welding being carried out on the surface of the second extremity portion in at least two separate zones arranged in such a manner so as to form an acute angle ? with the hole of the first extremity portion greater than 10°. This support structure enables the tube to be made less sensitive to mechanical vibrations.

Abstract: Suspension lug of a cathode ray tube comprising weld zones on the anti-implosion frame of the tube, the said weld zones extend in a first direction over a length L and according to a second direction perpendicular to the first over a length l, shorter than the length L. At least one of the weld zones extends in a direction contained in a plane different from the plane in which the other weld zones extend. This structure can increase the solidity of the welds and limit their number.

Abstract: Cathode ray tube with colour selection mask comprising a frame designed to hold the mask at a distance from the screen, the said frame of a noticeably rectangular shape has a pair of short parallel sides of a noticeably L-shaped cross-section with a lateral flank extending in a direction parallel to the longitudinal axis connected to a flange noticeably perpendicular to the said longitudinal axis, the width of the flange of each short side is lower in the middle of the side than at its extremities such that the inner edge of the flange defines a curve whose concavity is oriented toward the longitudinal axis of the tube. This frame structure improves the thermal behaviour of the frame/mask assembly and reduces the weight of the materials for producing the frame while maintaining a sufficient mechanical rigidity.

Abstract: Cathode-ray tube comprising a frame/colour selection mask assembly, in which the free end of the skirt of the mask is constrained by lugs integral with the frame, in such a way as to minimize the nuisance movements of the skirt of the mask under the influence of vibrations generated by the environment of the tube.

Abstract: The invention concerns cathode ray tubes with substantially planar front surface, whereof the colour selecting mask is produced by swaging. The mask comprises an active surface enclosed by a solid peripheral edge terminated by a skirt substantially perpendicular to the active surface. In order to rigidify the active surface in a direction parallel to the main axis, the mean radius of curvature of said active surface is greater than the mean radius of curvature of the peripheral edge.

Abstract: Color cathode-ray tube comprising a color selection mask (16) held under tension between a first pair of opposed long sides (30) of an approximately rectangular metal frame (21), a main magnetic screen (22) placed at the rear of the frame in the funnel-shaped part (11) of the tube's envelope, and additional means (50) for forming a screen against the Earth's magnetic field in the part lying along the second pair of opposed short sides of the frame.

Abstract: A method and apparatus for improving magnetic shielding in mask-frame-assemblies. The system includes providing a cathode ray tube, a mask frame assembly disposed within the cathode ray tube and at least one magnetic shield disposed on the edge of the mask frame assembly. These magnetic shields provide shielding for the horizontal component of the terrestrial magnetic field and thus reduces distortion in the picture displayed on the tube.

Abstract: Cathode-ray tube (1) comprising a frame/mask assembly for selecting colors having a mask (8) and a frame (19), the mask being held under tension by being attached to ends of long sides (9) of the frame, the frame/mask assembly being suspended inside the tube using support means (10) which are able to increase the mechanical rigidity of the frame by support means having longitudinal dimples (40) which cause the long sides of the frame to come together during the high-temperature manufacturing phases.

Abstract: Color cathode-ray tube comprising a color selection mask (16) held under tension between a first pair of opposed long sides (30) of an approximately rectangular metal frame (21), a main magnetic screen (22) placed at the rear of the frame in the funnel-shaped part (11) of the tube's envelope, and additional means (50) for forming a screen against the Earth's magnetic field in the part lying along the second pair of opposed short sides of the frame.

Abstract: A method and apparatus for improving magnetic shielding in mask-frame-assemblies. The system includes providing a cathode ray tube, a mask frame assembly disposed within the cathode ray tube and at least one magnetic shield disposed on the edge of the mask frame assembly. These magnetic shields provide shielding for the horizontal component of the terrestrial magnetic field and thus reduces distortion in the picture displayed on the tube.