A machine and method for high speed production of circuit patterns on
silicon wafers or similar substrates may be used for applications
including printing Integrated Circuit (IC) packaging patterns onto wafers
prior to separating IC chips. Projection camera(s) simultaneously project
image(s) onto substrate(s) carried on an X, Y, .theta. stage. The
projection camera(s) may include independent alignment systems, light
sources, and control of focus, image placement, image size, and dose. In
one embodiment, each camera includes a 6-axis reticle chuck that moves a
reticle to correct image-to-substrate overlay errors. In-stage metrology
sensors and machine software establish and maintain the correct
relationship among the machine's coordinate systems. Thus, two or more
projection cameras can print simultaneously even when substrates are
slightly misplaced on the X, Y, .theta. stage.