Microscope

The utility model provides a microscope, includes objective table, backup pad, bearing cylinder, control circuit and elevating system, elevating system includes the lift adjustment gear train. The bearing cylinder passes through the connecting piece to be connected with the backup pad, and adjusting the connecting piece through adjust the cylinder atmospheric pressure, to pass through the backup pad right the holding power size of objective table, the bearing cylinder includes gas outlet and air inlet, and the gas outlet is equipped with the bleed valve, and the air inlet is equipped with the admission valve, control circuit for control according to cylinder atmospheric pressure the switching of bleed valve and admission valve, admission valve open when cylinder atmospheric pressure is less than first default, aerify the bearing cylinder, and the bleed valve opens when cylinder atmospheric pressure is greater than the second default, right the bearing cylinder is exitted to make the holding power can to offse