| 摘要 |
<p>A color CRT comprising a light absorbing layer (black layer) and an optical filter layer both disposed on the inner surface of a transparent panel, and a fluorescent layer formed on them, wherein a length from a sealing end of the panel with respect to a funnel to a peripheral end of a light absorbing layer formed on the inner surface of a side wall is larger than or equal to a length up to a peripheral end of an optical filter layer formed on the inner surface of a side wall of the panel. This color CRT is obtained by setting a length (trimming size a) from a sealing end of the panel to a peeling-off end of a light absorbing layer during a trimming process for a light absorbing layer to be not smaller than a length (trimming length b) from a sealing end of the panel to a peeling-off end of a filter layer during a trimming process for an optical filter layer. Thus, deposition and remaining of black pieces on the inner surface of the panel that may occur while trimming an optical filter layer can be prevented to provide a color CRT free from display defects.</p> |
