Patent ID: 6941646

Claim:
An electric-component mounting system comprising: a component-supplying device operable to supply electric components; a substrate-holding device operable to hold a circuit substrate on which said electric components are to be mounted and which has at least one substrate fiducial mark, said substrate-holding device having at least one holding-device fiducial mark; a mounting head operable to receive the electric component from said component-supplying device and mount the electric component on said circuit substrate held by said substrate-holding device; a fiducial-mark imaging device operable to take an image of said at least one holding-device fiducial mark on said substrate-holding device, and an image of said at least one substrate fiducial mark on said circuit substrate as held by said substrate-holding device; a relative-movement device operable to relatively move said component-supplying device, said substrate-holding device, said mounting head and said fiducial-mark imaging device; and a control device including (a) a first relative-positioning-error obtaining portion operable to obtain a first relative positioning error between said fiducial-mark imaging device and said substrate-holding device, on the basis of a positioning error of said image of said at least one holding-device fiducial mark within an imaging area of said fiducial-mark imaging device, (b) a second relative-positioning-error obtaining portion operable to obtain a second relative positioning error between said fiducial-mark imaging device and said circuit substrate, on the basis of said image of said at least one substrate fiducial mark within the imaging area of said fiducial-mark imaging device, and (c) a movement control portion operable to control said relative-movement device for moving said mounting head and said substrate-holding device to a predetermined relative position as adjusted on the basis of at least first and second relative positioning errors.