Patent ID: 7036215

Claim:
A method of obtaining positioning errors of a printed-wiring board on which components are to be mounted by a plurality of component mounting units each of which includes a mounting head, a head drive device operable to move the mounting head, and a recognition device, said method comprising: a board-positioning step of positioning said printed-wiring board relative to said plurality of component mounting units such that areas of movements of the mounting heads of said plurality of component mounting units cover respective parts of said printed-wiring board, in a direction of arrangement of said component mounting units; a board-fiducial-portion recognizing step of operating said recognition device of each of at least two of said plurality of component mounting units to recognize at least one of a plurality of fiducial portions of said printed-wiring board, which is recognizable by said recognition device; a specific-position obtaining step of obtaining specific positions of each of said at least one of said plurality of fiducial portions, in respective specific coordinate systems respectively specific to said at least two component mounting units, on the basis of results of recognition of said each of said at least one of said plurality of fiducial portions by said recognition devices of said at least two component mounting units in said board-fiducial-portion recognizing step; and a positioning-error obtaining step of obtaining positioning errors of said printed-wiring board relative to said specific coordinate systems of said plurality of component mounting units, on the basis of said specific positions of said each of said at least one of said plurality of fiducial portions, which specific positions have been obtained in said specific-position obtaining step.