| 摘要 |
PROBLEM TO BE SOLVED: To restrain vibration of flickering in all areas of an image plane by providing a vibration control effect to the whole surface of an aperture grill. SOLUTION: This vibration control device 41 comprising a band-shaped metal thin plate 29 is brought contact with a protrusively curved surface side of an aperture grill 25 in the direction orthogonal to the longitudinal direction of the portions. The aperture grill 25 is formed of a plurality of slits and the tape portions parallel to each other that are formed alternately, and is stretched between protrusively curved sides of curved members 23, 23 so that tension is given to the longitudinal direction of the tape parts. In this device 41, both longitudinal end sides of the band-shaped metal thin sheet 29 are contacted with the aperture grill 25 in an area larger than that of its central portion in the longitudinal direction.
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