Patent ID: 6961994

Claim:
A method of alignment in a chip mounting device having a plurality of heads each holding a chip, and a rotary mechanism moving the plurality of heads along a circular orbit to a plurality of positions including at least a position for receiving a chip and a position for mounting the chip onto a substrate, comprising the steps of: sensing a position of the substrate on a substrate stage at a chip mounting position on the circular orbit by a first recognition means; recognizing a position of the chip held on each head at an intermediate position between the chip receiving position and the chip mounting position on the circular orbit, which is different from the chip mounting position, by a second recognition means; controlling the relative positional relationship between the substrate and the chip at the chip mounting position within a target accuracy reading a calibration mark provided on a head side by the second recognition means; moving the calibration chip mounting head following said step of mark to the position together with the reading a calibration mark; reading the calibration mark by the first recognition means following said step of moving the calibration mark; and determining an amount of calibration for each head based on information read by the first and second recognition means.