| 摘要 |
There is disclosed a shadow mask for a color braun tube to reduce moire by improving a structure of a beam passage hole on a mask.According to a first embodiment, in a color braun tube including a mask having many beam passage holes over emitting paths of electron beams, a mask for the color braun tube has a vertical pitch of the beam passage holes that is 2.7 and more times as long as a vertical pitch of horizontal electron beam lines scanned on a screen.According to a second embodiment, in a color braun tube including a mask having many beam passage holes over emitting paths of electron beams, a mask for the color braun tube has a vertical pitch of the beam passage holes that is 3.4 and more times as long as a vertical pitch of horizontal electron beam lines scanned on a screen.According to a third embodiment, in a slot mask comprising beam passage holes whose length is shorter than a length of each beam passage hole in a grille mask and longer than a length of each beam passage hole in a dot mask and bridges connected to no-hole portions between the beam passage holes arranged in a vertical direction, a mask for a color braun tube has symmetrical left and right bridges by separating and isolating each of the bridges at its center, each of the left and right bridges covering a part of a fluorescent material including a black matrix.
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