| 摘要 |
In a shadow mask 201 , a large number of slots 2 are made in a mask body 201 a in the horizontal direction X and in the vertical direction Y. Each slot 2 has a roughly rectangular backside opening 21 and a roughly rectangular front-side opening 22 that are made by an etching process, and a through-hole 11 that connects these two openings. Of the multiple slots 2 made in the mask body 201 a, those slots that are situated at least in the outer end part of the horizontal axis 3 of the mask body 201 a or in the outer end part of the diagonal axis 5 of the mask body 201 a have rectangular through-holes 11 with protrudent parts 21 a ( 21 b), each protrudent part protruding, in the direction opposite to the vertical axis 4 , from at least one of the upper and lower end parts of the long side, situated on the side part from the vertical axis 4 , of the rectangle, and extended-space parts 25 , each extended-space part extending, in the direction in which the vertical axis 4 extends, from at least one of the two short sides of the rectangle to make the through-hole 11 , in its plane view, larger. The extended-space part 25 of each through-hole 11 gradually broadens in the vertical direction, from the starting point of extension 25 a situated on the vertical axis 4 side in the mask body 201 a toward the end point of extension 25 b situated on the peripheral part side in the mask body 201 a.
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