Patent ID: 7102148

Claim:
A calibration method in an electronic component mounting apparatus having a circuit board transfer device mounted on a base frame for performing the loading, unloading and positioning of circuit boards; a movable table supported on the base frame to be movable in two directions of X and Y directions; a component placing device installed on the movable table for taking out components supplied by a component supply device and mounting the components on the circuit board positioned on the circuit board transfer device; a board recognizing camera fixed on the movable table; and a component recognizing camera fixed on the base frame; wherein the component placing device is replaceable with another component placing device different in performance, the method comprising the steps of: providing a reference mark at a stationary position on the base frame to reside in the visual field of the component recognizing camera; positioning the movable table to a predetermined position relative to a coordinate origin to make the reference mark at the stationary position come in the visual field of the board recognizing camera; and calculating a positional relation between optical axes of the board recognizing camera and the component recognizing camera when the movable table is positioned at the predetermined position, based on respective positional relations of the reference mark, at the stationary position, relative to the optical axes of the component recognizing camera and the board recognizing camera, the respective positional relations being detected by the component recognizing camera and the board recognizing camera.