Patent ID: 7583361

Claim:
A precision assembly for moving a device along a movement axis, the precision assembly comprising: a stage that retains the device; a mover assembly coupled to the stage, the mover assembly including a first mover that moves the stage along the movement axis and a second mover that moves the device along the movement axis, the second mover being rigidly coupled to the first mover so that movement of the first mover results in movement of the second mover; a measurement system that measures a measured position along the movement axis; and a control system that controls the mover assembly utilizing the measured position, the control system utilizing a first mover path to control the first mover, a second mover path to control the second mover, and a decoupled path that effectively decouples the control of the first mover from the control of the second mover by directing a decoupled gain derived at least in part from the properties of the second mover to the first mover path.