| 摘要 |
PROBLEM TO BE SOLVED: To form a reference hole at a position where defect rate can be reduced more than other position. SOLUTION: Origin coordinate and a coordinate axis angle of a first coordinate system are obtained using a point of the center of gravity as an immobile point and applying the least square method from a coordinate value of a machine coordinate system obtained by observing a plurality of guide marks PDi (i=1 to n) formed in conductor layers of a plurality of multilayer printed wiring boards, and arrangement (origin coordinate value, angle of coordinate axis) of a design coordinate system describing a pattern, a hole position, a guide mark, a reference hole, etc., formed in the conductor layers of the multilayer printed wiring boards is calculated with a reference hole drilling machine. Next, individual error of observed value of each guide mark is obtained, two guide marks in which error is the maximum and the minimum are selected depending on coordinate axis, and arithmetic average of the coordinate values is used as an immobile point to calculate a second coordinate system by the same procedures. A coordinate system in which error is reduced more than other coordinate system is adopted among the arrangements of the first and second coordinate systems. COPYRIGHT: (C)2003,JPO |
