Patent ID: 6327024
Filing Date: 2001-12-04
Classification: F16F,G03F

Abstract:
A vibration isolation apparatus, comprising:a base member that mounts an object to be processed;a plurality of vibration damping devices which are disposed on an installation surface for said base member, the plurality of vibration damping device supporting said base member and damping vibrations between the installation surface and said base member; anda damping characteristic varying device that is connected with one or more vibration damping devices among said plurality of vibration damping devices, and varies at least either one of a spring constant and a damping coefficient of predetermined one or more vibration damping devices in accordance with a state of movement of the object to be processed,wherein said predetermined one or more vibration damping devices have an electrical actuator that applies a force to said base member from the installation surface in response to a position sensor signal, andsaid damping characteristic varying device varies again applied to the position sensor signal before input to the electrical actuator.