Tension mask cathode ray tube
AssigneeSamsung SDI Co., Ltd.
InventorsHyang-Jin Koh, Seong-Seob Kim, Jong-Heon Kim, Tae-Yong Kim
Life of this patent
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Abstract
A tension mask cathode ray tube has a vacuum tube and an inner shield mounted within the vacuum tube to shield the vacuum tube from geomagnetism. A value Br/Hc of the inner shield where Br indicates a residual magnetic flux density and Hc indicates a coercive force is established to be 1.0-2.0 times more than a value Br/Hc of the mask frame. In this structure, the route of electron beams is established to be more precise. Consequently, the purity characteristic and the convergence characteristic are improved while forming a precise raster. In this way, the display screen quality can be enhanced.
Claims18
A tension mask cathode ray tube comprising:
- a vacuum tube having a panel with a phosphor screen, a funnel sealed to the panel, and a neck connected to the funnel;
- an electron gun mounted within the neckfor emitting electron beams;
- a tension mask for color-selecting electron beams emitted from the electron gun;
- a mask frame for holding the tension mask such that the tension mask is tensioned in a uni-axial direction or in a bi-axial direction;
- a deflection yoke for deflecting the electron beams emitted from the electron gun;
- and
- an inner shield mounted within the vacuum tube to shield the vacuum tube from geomagnetism,
- wherein a value Br/Hc of the inner shield is 1.0-2.0 times more than a value Br/Hc of the mask frame, where Br indicates a residual magnetic flux density and Hc indicates a coercive force.
A tension mask cathode ray tube comprising:
- a vacuum tube having a panel with a phosphor screen, a funnel sealed to the panel, and a neck connected to the funnel;
- an electron gun mounted within the neck for emitting electron beams;
- a tension mask for color-selecting electron beams emitted from the electron gun;
- a mask frame for holding the tension mask such that the tension mask is tensioned in a uni-axial direction or in bi-axial directions;
- a deflection yoke for deflecting the electron beams emitted from the electron gun;
- and
- an inner shield mounted within the vacuum tube to shield the vacuum tube from geomagnetism,
- wherein a value Br/Hc of the inner shield is 1.0-2.5 times more than a value Br/Hc of the tension mask, where Br indicates a residual magnetic flux density and Hc indicates a coercive force.
A tension mask cathode ray tube comprising:
- a vacuum tube having a panel with a phosphor screen, a funnel sealed to the panel, and a neck connected to the funnel;
- an electron gun mounted within the neck for emitting electron beams;
- a tension mask for color-selecting electron beams emitted from the electron gun;
- a mask frame for holding the tension mask such that the tension mask is tensioned in a uni-axial direction or in bi-axial directions;
- a deflection yoke for deflecting the electron beams emitted from the electron gun;
- and
- an inner shield mounted within the vacuum tube to shield the vacuum tube from the geomagnetism,
- wherein a value Br/Hc of the inner shield is 1.0-2.0 times more than a value Br/Hc of the mask frame while being 1.0-2.5 times more than a value Br/Hc of the tension mask, where Br indicates a residual magnetic flux density and Hc indicates a coercive force.
Dependencies are inferred from the claim text.