摘要:
The invention relates to an active vibration isolation system in which at least one sensor is provided for detection of ground vibration, and the system has a control device which calculates compensation signals in at least two degrees of freedom, based on movements of the ground.
摘要:
The invention relates to a vibration isolation system, comprising at least one fluid bearing having a first control device in order to control the fluid pressure and having at least one actuator in order to compensate for position changes of the load to be isolated, which actuator is controlled by at least one second control device, wherein the input of one control device is connected to the output of the other control device.
摘要:
Control of an active vibration isolation system with a digital controller, which includes an FPGA system (5) as the control unit. The FPGA system (5) is made up of freely programmable gate arrays with a sensor control matrix (51), which calculates axis signals in required degrees of freedom, with a control cascade block (53) for the axis signals containing several biquad filters (531, 532, 533, 534, 535), and with an output signal calculation block (55) for calculating digital actuator actuation signals. A digital signal processor (9) is connected in parallel with the FPGA system (5) in order to calculate controls with low phase loss requirements.
摘要:
The invention relates to an active vibration isolation system in which the effective axis of a sensor essentially corresponds to the effective axis of an actuator and the sensor and the actuator are arranged close to one another.
摘要:
The invention relates to an active vibration isolation system in which at least one sensor is provided for detection of ground vibration, and the system has a control device which calculates compensation signals in at least two degrees of freedom, based on movements of the ground.
摘要:
An apparatus for accepting and transferring at least one disk-like member is provided. The apparatus includes a pick- and place-mechanism including gripping means. In effect, the mechanism is adapted to provide pick- and/or place-cycles, which during operation provides a movement of said gripping means between an up and a down position and vice versa, whereby, in the down position, said gripping means either picks the disk-like member from a load position or places the disk-like member onto the load position.
摘要:
An electrostatic gripper for moving wafers includes bipolar electrodes with an insulating layer of zirconium oxide, which are positioned on a circuit board. The gripper is produced by a pressing process and can be operated with a DC voltage of less than 900 V. As a result, heating of the wafer is almost completely prevented even under a vacuum.
摘要:
A supporting device (53) provided with a first part (69), a second part (71), and a gas spring (73) for supporting the second part relative to the first part parallel to a support direction (Z). The gas spring (73) comprises a pressure chamber (75) which is provided in an intermediate part (79) and is bounded by a piston (81) which is displaceable in the intermediate part (79) parallel to the support direction and is supported perpendicularly to the support direction by means of a static gas bearing (85). A stiffness of the supporting device parallel to the support direction is thus substantially entirely determined by a stiffness of the gas spring, and a low stiffness can be achieved through a suitable design of the gas spring. A transmission of vibrations directed parallel to the support direction from the first part to the second part is prevented as much as possible thereby. The invention also relates to a lithography device having a plurality of such supporting devices.
摘要:
Method and arrangement for oscillation isolation by means of an air bearing. The electropneumatic valves (4) for the compressed-air supply to the air bearing are subjected to a dither signal. This causes additional vibration of the mass 1 to be isolated. A compensation signal transmitter (12) ensures that additional vibration of the mass (1) is suppressed, by controlling actuators (10). Overall, hysteresis effects are avoided in the control of the compressed-air flow.