Patent ID: 7809461

Claim:
A working apparatus for a circuit board, the working apparatus comprising: a measuring means for measuring measurement displacement magnitudes of the circuit board from a work reference surface at each of at least three measurement spots set on a working surface of the circuit board and at least one corresponding auxiliary measurement spot set in a vicinity of at least one of the at least three measurement spots, respectively; an operation means for determining whether a difference between a maximum value and a minimum value of the measurement displacement magnitudes from the work reference surface measured by the measuring means at each of the at least three measurement spots and the at least one corresponding auxiliary measurement spot is not greater than a threshold value, estimating a shape of the working surface of the circuit board by a curved surface model based on the measurement displacement magnitudes of the at least three measurement spots that have been determined to have a difference between a maximum value of the measurement displacement magnitude and a minimum value of the measurement displacement magnitude not greater than the threshold value, and calculating operation displacement magnitudes of the curved surface model at curved surface model measurement spots on the curved surface model which correspond to the at least three measurement spots, on the work reference surface, used to estimate the curved surface model; and a correcting means for correcting a working height in performing works on the working surface of the circuit board on the basis of the operation displacement magnitudes of the curved surface model calculated by the operation means.