Patent ID: 6570313
Filing Date: 2003-05-27
Classification: H01J

Abstract:
A color cathode-ray tube comprising a frame-shaped mask frame and a shadow mask in which many slot or dot apertures are formed in a flat plate, the shadow mask being stretched and fixed in the mask frame in a condition in which a tension force is applied in one direction, whereinamong side faces of the mask frame, each of side faces arranged in a direction perpendicular to the direction in which the tension force is applied is configured so that a portion thereof on the shadow mask side that supports the shadow mask is not separated from a portion thereof on an opposite side to the shadow mask, and a vibration of the shadow mask throughout its surface caused by a vibration propagated to the color cathode ray tube is such that an amplitude in an end portion of the shadow mask in the direction perpendicular to the direction in which the tension force is applied is not less than a certain amount relative to an amplitude in a center portion of the shadow mask, in a vibration mode of a seventh or less order for a resonance of the shadow mask caused by the vibration propagated to the color cathode-ray tube, wherein an amplitude in the end portion of the shadow mask is not less than 20% with respect to an amplitude in the center portion of the shadow mask.