Patent ID: 6807726
Filing Date: 2004-10-26
Classification: G05B,H05K,Y10S,Y10T

Abstract:
An electric-component mounting system wherein an electric component held by a component holder is moved to and positioned at a target mounting position on a substrate supported by a substrate supporting device, and the positioned electric component is mounted on the substrate, said electric-component mounting system comprising:a main body structure; a drive device; a movable portion movable relative to said main body structure; a motion-transmitting member disposed on said main body structure and linearly extending in one direction, said motion-transmitting member being operable to give said movable portion a linear motion in said one direction during an operation of said drive device, such that thermal expansion of said motion-transmitting member causes a corresponding positioning error of said movable portion in the direction of said linear motion; a member fixedly disposed on said movable portion; an image-taking device fixedly disposed on said main body structure and operable to take an image of said member, said member being spaced apart from said component holder in a direction parallel to said substrate as supported by said substrate supporting device, said member and said image-taking device being disposed relative to each other such that an error of relative positioning of said member and said image-taking device, which is detected on the basis of the image of said member taken by said image-talcing device, substantially represents a thennal-expansion positioning error which is a positioning error of said member, which positioning error is derived from thermal expansion of the electric-component mounting system; and a controller operable to apply a drive signal to said drive device, for controlling a position of said movable portion in the direction of said linear motion, said controller determining said drive signal on the basis of said image of said member taken by said image-taking device, so as to reduce an amount of influence of said thermal-expansion positioning error on an actual position of said movable portion in the direction of said linear motion.