| 摘要 |
In a shadow mask 21 , a large number of slots 23 are made in a mask body 22 in the horizontal direction X and in the vertical direction Y. Each slot 23 has a roughly rectangular backside opening 33 , a roughly rectangular front-side opening 32 , and a through-hole 31 that connects these two openings 33, 32 . Of the multiple slots 23 made in the mask body 22 , the slots 23 situated at least in those areas of the mask body 22 that are surrounded by a horizontal axis 24 and two diagonal axes 26, 27 that pass through the center point 28 of the mask body 22 have such front-side openings 32 that a pair of the upper and lower short sides 32 c, 32 d of the rectangular outline of the front-side opening 32 of each slot 23 are inclined, relative to the horizontal axis 24 , along the radiate line 61 radiating from the center point 28 of the mask body 22 toward the slot 23 . The angle of inclination beta of the short sides 32 c, 32 d is preferably in the range of a alpha±10°, where alpha is the angle between the radiate line 61 radiating from the center point 28 of the mask body toward the slot 23 and the horizontal axis 24.
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