Patent ID: 8071944

Claim:
A portable electron microscope, comprising: a microcolumn; a low vacuum pump for producing a low vacuum of range of atmospherical pressure to about 10 âˆ’3 torr; a high vacuum pump for producing a high vacuum of range of about 10 âˆ’3 torr to about 10 âˆ’7 torr; an ultra-high vacuum pump for producing an ultra-high vacuum of range of about 10 âˆ’3 torr to about 10 âˆ’11 torr; a chamber for receiving and fixing the microcolumn and a sample to be measured, and forming a vacuum by means of the pumps; a controller; and a case for receiving pumps, the chamber and the controller, wherein the portable electron microscope has a size smaller than 400 mmÃ—500 mmÃ—400 mm to be movable, and wherein the case is partitioned into a high-temperature partition and a low-temperature partition and the chamber is disposed in the high-temperature partition of the case and the controller is disposed in the low-temperature partition of the case such that the chamber and the controller are isolated and blocked thermally from each other, such that the controller is protected from the bake-out heat of the chamber for bake-out of the chamber in the high-temperature partition of the case, and such that the controller is maintained in a low temperature and the chamber is maintained in a high temperature.