Patent ID: 6452318
Filing Date: 2002-09-17
Classification: H01J

Abstract:
A color cathode-ray tube comprising:a panel having a substantially rectangular effective section, and four side walls provided on a peripheral edge portion of the effective section; a phosphor screen formed on an inner surface of the effective section of the panel; a shadow mask arranged inside the panel, having a substantially rectangular mask body opposed to the phosphor screen, and also having a substantially rectangular mask frame supporting a peripheral edge portion of the mask body and opposed to the side walls; a plurality of elastic support members provided between the mask frame and the side walls of the panel and elastically supporting the mask frame on the side walls of the panel, the elastic support members being adapted to displace the mask frame toward the phosphor screen along a tube axis of the color cathode-ray tube when the mask frame thermally expands toward the side walls of the panel; and an electron gun for emitting electron beams toward the phosphor screen through the shadow mask; wherein each of the elastic support members is formed by bending a substantially rectangular plate along first and second bending lines which extend substantially in parallel to each other and inclined to the tube axis, and has a fixed portion fixed to the mask frame and being adjacent to the first bending line, an engagement portion engaged with a corresponding one of the side walls and being adjacent to the second bending line, and a slope portion connecting the engagement portion to the fixed portion, the first bending line being shorter than the second bending line, and the slope portion has a responsiveness to a displacement in the mask frame due to thermal expansion of the mask frame, the part of the slope portion, which is close to the first bending line, having a higher responsiveness than the part of the slope portion, which is close to the second bending line.