发明公开
EP0799439A1 POSITIONING DEVICE WITH A FORCE ACTUATOR SYSTEM FOR COMPENSATING CENTRE-OF-GRAVITY DISPLACEMENTS 失效
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POSITIONING DEVICE WITH A FORCE ACTUATOR SYSTEM FOR COMPENSATING CENTRE-OF-GRAVITY DISPLACEMENTS
摘要:
The positioning mechanism has a force actuator system controlled by an electric controller, and which exerts a compensation force on the frame (45) during operation. The force has a mechanical moment about a reference point of the frame. This moment has a value equal to a value of a mechanical moment of a force of gravity acting on the object table (5) about the reference point, and a direction opposed to a direction of the mechanical moment of the force of gravity.
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