| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily and efficiently form a large number of small holes, and to realize consistent machining by eliminating troubles of a machine. <P>SOLUTION: First and second grooves across each other are formed in opposing faces to specify the thickness of a member for screen, and the total depth (B+C) of the grooves is set to be equal to or larger than the wall thickness A of the member for screen. <P>COPYRIGHT: (C)2004,JPO |
