| 摘要 |
The present invention relates to a color cathode ray tube and more specifically to a color cathode ray tube in which beam landing errors caused by non-uniform thermal expansion of a shadow mask are corrected such that color purity is improved. According to an aspect of the present invention, A cathode ray tube comprises a panel on inner surface of which a phosphor screen is formed; a funnel joined to the panel; an electron gun generating electron beams; a shadow mask mounted to the panel, the shadow mask having a faceplate portion and a peripheral skirt portion bent back from said faceplate portion, said faceplate portion further comprising an apertured portion and a non-apertured portion surrounding said apertured portion; and a frame having a supporting portion joined to said skirt portion and a bottom portion bent inward from said supporting portion and extending by width Da from the short side of said supporting portion, wherein Da satisfies: Da<HaxLa/P+Na where La represents distance between center point Fx of said faceplate portion and a short side of said apertured portion; Na represents distance between the short side of said apertured portion and a short side of border of said faceplate portion from which said skirt portion is bent; P represents distance between the electron beams deflection center Dx and the center point Fx of said faceplate portion; Ha represents distance between the short side of the border of said faceplate portion and a short side of rear end line of said supporting portion from which the bottom portion is bent.
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