| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide technology effective for rationally constructing an air bag cover to cover an air bag for a vehicle. <P>SOLUTION: The air bag cover 100 is processed so that a cross-section shape of a tear line 102 becomes "a zigzag-cut shape", "a sealer-cut shape" or "a stepped-cut shape", and so that the shape, in plan view, of the tear line 102 becomes a "meandering-cut shape" in forming the tear line 102 on which a groove of a depth within an area of the plate thickness of the air bag cover 100 by processing the air bag cover by using an ultrasonic processing blade 216. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
