发明名称 |
Color picture tube shadow mask having a column-to-column spacing with a pseudo-cyclic variation |
摘要 |
An improved color picture tube (10) has a shadow mask (24) mounted therein in spaced relation to a viewing screen (22) thereof. The mask has a rectangular periphery with two long sides and two short sides. A major axis (X) passes through the center of the mask and parallels the long sides thereof, and a minor axis (Y) passes through the center of the mask and parallels the short sides thereof. The mask has an aperture array (35) that includes slit-shaped apertures (36) aligned in columns (37) that essentially parallel the minor axis and end at a border of the aperture array. The improvement comprises the column-to-column spacing (aH) parallel to the major axis including a pseudo-cyclic variation at least in a portion of the mask, wherein a complete cycle within the pseudo-cyclic variation occurs in the column-to-column spacings between no more than nine consecutive columns.
|
申请公布号 |
US6242855(B1) |
申请公布日期 |
2001.06.05 |
申请号 |
US19990265787 |
申请日期 |
1999.03.10 |
申请人 |
VIDEOCOLOR, S.P.A. |
发明人 |
CARONNA GAETANO;RONZANI ANTONINO MARIA |
分类号 |
H01J29/07;(IPC1-7):H01J29/80 |
主分类号 |
H01J29/07 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|