Electronic component mounting apparatus and method of mounting electronic component

A method of mounting an electronic component having a plurality of leads on a printed circuit board, comprising the steps of:

• picking up and holding the electronic component by a suction nozzle on a mounting head on a carrier turntable;
• moving the electronic component to a field of vision of a camera by rotating the carrier turntable;
• roughly observing the position of the electronic component held by the suction nozzle by means of said camera and determining the rough deviation of the observed position of the electronic component from a desired position;
• roughly correcting for the observed deviation of the electronic component in an X-axis and a Y-axis direction by moving a movable table means supporting a circuit board on which the component is to be mounted in an X-axis and Y-axis direction of the circuit board and, while moving the electronic component to an area where the movable table means is positioned by rotating of said carrier turntable, roughly correcting for the observed deviation of the electronic component in a .THETA. direction by rotating the suction nozzle around an axis through the center of the electronic component held thereon;
• precisely measuring the position of the electronic component held by the suction nozzle by a precise measuring means on said movable table means for determining the precise deviation of the observed position of the electronic component from a desired position on the printed circuit board supported on said movable table means;
• precisely correcting for the observed deviation of the electronic component in an X-axis and a Y-axis direction by moving said movable table means in the X-axis and Y-axis direction, and precisely correcting for the observed deviation of the electronic component in the .THETA. direction by rotating the printed circuit board around an axis of rotation which extends through the circuit board in a direction perpendicular to the circuit board by rotating a circuit board support rotatably mounted on said movable table means around said lastmentioned axis;
• and
• placing the electronic component on the printed circuit board.