Patent ID: 7533459

Claim:
A method of mounting an electronic component, comprising: repeating a mounting operation comprising performing a pickup operation of picking up an electronic component using a suction nozzle from a component feeding unit based on an offset value from a proper pickup position, calculating a positional shift of the picked up electronic component with respect to the suction nozzle, storing the calculated positional shift in a memory, counting the number of the pickup operations, and mounting the picked up electronic component on a printed board; calculating a first feed back value by multiplying an average of the stored positional shifts by an initial value, when the number of the pickup operations is smaller than a predetermined number, and calculating a second feed back value by multiplying the average of the stored positional shifts by a temporary value, when the number of the pickup operations is larger than or equal to the predetermined number, the temporary value being calculated by adding to the initial value the number of the pickup operations multiplied by a negative number; and adding the first feed back value to the offset value, when the number of the pickup operations is smaller than the predetermined number, and adding the second feed back value to the offset value, when the number of the pickup operations is larger than or equal to the predetermined number, wherein the initial value is larger than 0 and less than or equal to 1.