COLOR IDENTIFYING MECHANISM OF CATHODE-RAY TUBE

PROBLEM TO BE SOLVED: To reduce generation of a long-time vibration phenomenon of a tape- shaped grid element body due to a damper wire float by making a most end tape negative coefficient within a range of specific values in a color identifying mechanism having a tensioned thin wire. SOLUTION: A flat aperture grill is provided with a tape-shaped grip element body 2a and a longitudinal stripe shaped opening. A damper spring 4 is mounted to a frame 1. From a center of the aperture grill to the most end tape shaped grid element body 2b, at a position downward by Z than a distance ΔZ to a cross point with R along a curvature Rz of the aperture grill 5 at a position distant by a distance L1 outside, a wire damper 3 is tensioned with a tensile stress t. When a lower quantity Z of a damper spring 4 is defined as a most end distortion coefficient α, a vibration of the tape-shaped grid element body is attenuated quickly by setting the coefficient α to 0.4 or more and 1.0 or less.