| 摘要 |
A color picture tube includes: a glass panel having a substantially rectangular-frame skirt; a rectangular frame holding a shadow mask; and a support spring elastically supporting the frame inside the skirt and fixed to a first position at inside surface of a long side of the skirt and to a second position at the facing outside surface of the frame. The first and second positions are away in horizontal axis direction perpendicular to tube axis and substantially parallel to the long side. The second position is more away from vertical axis perpendicular to tube axis and horizontal axis than the first position. Materials for the support spring and frame are selected so that, in horizontal axis direction, thermal expansion amount of the support spring between the first and second positions is substantially same as that of the frame between the second position and vertical axis when the tube is operated.
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