Impact Filling of Cavities with Mercury
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
In Josephson technology packaging techniques, and others, pools of mercury located in cavities in a board are used to provide electrical contacts to pins inserted in the mercury-filled cavities. Due to the high surface tension of the mercury and to surface energy changes, it is difficult to provide a technique for filling the cavities with mercury wherein a 100 percent yield is obtained. In order to solve this problem, an impact force is applied to a mercury mass in close contact with the board containing the cavities to be filled. The impact is such that an energy barrier represented by the surface energy of the new mercury ball surface plus the force needed for insertion into the cavity is exactly overcome.