MATERIAL EVAPORATION CHAMBER WITH DIFFERENTIAL VACUUM PUMPING

摘要

The invention relates to a material evaporation chamber, comprising a vacuum chamber (10) and a first pumping unit (13) for pumping said chamber and material sources. According to the invention, a wall (23), which can provide a total or partial vacuum seal, divides said chamber into a first volume (25) and a second volume (22). Certain material sources (17) with a principal axis (18) are placed in the second volume (22). Said second volume (22) is pumped by a second pumping unit (24). The wall (23) comprises apertures (26) which are each centered on the principal axis (18) of one of the material sources (17). The evaporation chamber further comprises means (27) for blocking or opening each of said apertures (26), said means (27) being controlled individually to protect the material sources (17) having an unused principal axis (18).