US Patent 7180571 Lithographic projection apparatus and actuator

A lithographic projection apparatus is disclosed. The apparatus includes a substrate support constructed to support a substrate, a projection system configured to project a patterned radiation beam onto a target portion of the substrate, and a frame onto which at least a part of the projection system is mounted. A fluid provider is arranged to provide a fluid between the substrate and a downstream end of the projection system. The apparatus also includes an actuator associated with the frame and with the fluid provider and arranged to position the fluid provider, and a cushion system for cushioning vibrational forces when the actuator positions the fluid provider.