Vibration Isolation Platform

How they work:

The positive stiffness of the springs is compensated by a mechanism with negative stiffness, which reduces the overall stiffness to almost zero. Imagine an upright pendulum. The equilibrium is unstable because a deflection leads to a force away from equilibrium. The stiffness of the upright pendulum is therefore negative. Now springs from 4 different directions are attached to the top of the pendulum, which are tensioned until the pendulum is just stable. The stiffness is now positive, but minimal. Vibrations of the environment are transmitted to the pendulum only strongly damped. If the pendulum is still to carry a payload, the springs must be tightened slightly. The weight to be carried, e.g. of an interferometer or a scanning probe microscope, is therefore part of the negative-stiffness mechanism.

ModelSize in mmPayload range in kgNatural frequency
BM-10310x310x1170 - 501,5Hz horizontal, 0,5Hz vertical
BM-8457x508x1174,5 - 115,51,5Hz horizontal, 0,5Hz vertical
BM-6457x508x1174,5 - 115,51,5Hz horizontal, 2,5Hz vertical
BM-4427x427x2160 - 930,5Hz horizontal, 0,5Hz vertical
BM-1610x572x21627 - 4760,5Hz horizontal, 0,5Hz vertical
BA-1610x572x21627 - 4760,5Hz horizontal, 0,5Hz vertical
CM-1200x200x21622,7 - 476,30,5Hz horizontal, 0,5Hz vertical
LC-4121x121x178/ 2035,4 - 591,5/ 0,5 Hz horizontal, 0,5Hz vertical
WS-4610x610-83827 - 4760,5Hz horizontal, 0,5Hz vertical
SM-1330x330x52150 - 19050,5Hz horizontal, 0,5Hz vertical