Patent attributes
A method of accurately calibrating a movement control system of mark recognition means in a chip mounting device, comprising the steps of: recognizing a first recognition mark put on a head (2) and a second recognition mark (13) put on a stage (26) with two-field recognition means (7) so as to calibrate and update the preceding control parameters inputted into the movement control system of the two-field recognition means (7); and, with the head (2) lowered to position the first recognition mark closely to the second recognition mark (13), recognizing both marks with third recognition means (20) when the two-field recognition means (7) is moved back so as to calibrate and update the preceding control parameters inputted into the movement control system of the two-field recognition means (7).
