Patent ID: 6170622
Filing Date: 2001-01-09
Classification: F16F,G03F,G05D

Abstract:
An anti-vibration apparatus for eliminating the vibration of an anti-vibration table, said anti-vibration apparatus comprising:a plurality of active support legs which support said anti-vibration table and which are able to actively operate to control the motion of said anti-vibration table in a horizontal plane;control means for controlling the operation of said plurality of active support legs; anda plurality of pressure detecting means for detecting the internal pressures of air springs respectively provided in said plurality of active support legs,wherein said control means comprises a pressure feedback loop which feeds the signals, which are based on the internal pressures of said air springs detected by said plurality of pressure detecting means, back to a control system of said control means in order to adjust the internal pressures of said air springs according to the detected internal pressures.